Coatings comprising surface-reacted calcium carbonate and oxygen scavengers for improving the shelf life of foods

Abstract

The present invention relates to a kit for improving the shelf life of food, comprising a sheet element assembly and an alkaline component. The sheet element assembly comprises a particulate filler containing surface-reacted calcium carbonate, a binder, and an oxygen scavenger. The oxygen scavenger is a compound containing at least two phenolic hydroxyl groups, which can be deprotonated by the alkaline component, thereby activating the oxygen scavenger. Further aspects of the invention relate to activated sheet elements formed from the kit of the present invention, a method for manufacturing the kit for improving the shelf life, a method for manufacturing the sheet element assembly, a method for activating the sheet element assembly, a supply device containing the activated sheet elements, food packaging containing the activated sheet elements, and the use of the kit or the activated sheet elements in food packaging and for extending the shelf life of food.

Description

Technical Field

[0001] The present invention relates to a kit for improving the shelf life of foods comprising a sheet-like element assembly and an alkaline component, activated sheet-like elements formed therefrom, uses thereof, a method for producing a kit for improving the shelf life and a method for producing a sheet-like element assembly. Background Art

[0002] The presence of oxygen in food packaging can negatively impact the quality of various oxygen-sensitive foods. For example, the presence of oxygen in food packaging is typically associated with flavor loss in freshly roasted products such as coffee and nuts, as well as in sauces and seasonings. Furthermore, oxygen can lead to the degradation of vitamins such as A, C, and E, as well as red colorants in berries, sauces, and meat products. It also promotes the growth of potentially harmful aerobic bacteria, encourages mold growth in cheese, other dairy products, and baked goods, accelerates the browning of fruits and vegetables, and causes rancidity in fats and oils. In fruit or vegetable juices, such as orange juice, oxygen contributes to the degradation of vitamin C. Consequently, the presence of oxygen in food packaging can negatively impact the edibility, nutritional value, texture, aroma, and color of food, reducing consumer acceptance and shelf life. The food industry must also adapt to consumer demand for minimally processed foods that contain few or no additives or preservatives while maintaining acceptable or even increased shelf life. This presents an additional requirement: any technical solution for increasing shelf life should not require complex packaging systems; rather, the shelf-life extension method should be easily integrated into the packaging system.

[0003] Several methods are known in the art for reducing the amount of oxygen present in food packaging, such as vacuum packaging, modified atmosphere packaging (MAP), the use of oxygen-impermeable food packaging, or the use of oxygen scavenging elements. In the case of MAP, a mixture of carbon dioxide and nitrogen (typically containing 30-50% CO2 by volume) is introduced into the food package. However, residual oxygen concentrations in the packaging atmosphere can remain as high as 5% by volume due to oxygen entrapment in the food matrix, oxygen permeation through the packaging material, or inadequate sealing of the food package. The combined use of oxygen scavengers and MAP can provide desirable low residual oxygen levels (preferably less than 0.5% by volume or even less than 0.1% by volume) in food packaging.

[0004] Oxygen scavenging elements are known in the prior art in the form of pouches, carriers, plastic films, labels or plastic trays. However, the pouches may accidentally break, thereby allowing the food to be spoiled by the oxygen scavenger contained, or may be regarded as "foreign matter", which makes the food packaging unacceptable. Therefore, pouches are uncommon, for example, in European countries. Alternatively, the oxygen scavenger can be integrated into the packaging material. However, conventional film processing techniques such as casting, extrusion or pressing are usually carried out at high temperatures (e.g., about 200° C.). At these temperatures, the stability of the oxygen scavenger may be negatively affected. In addition, the oxygen scavenger integrated into the film may be less accessible to the oxygen contained, which may impair its oxygen scavenging activity.

[0005] Oxygen scavenger supports are known in the art. For example, EP1550506A1 discloses an oxygen scavenger support based on activated carbon and calcium silicate. EP3192850A1 and WO2017121675A1 relate to calcium carbonate-based supports for oxygen scavenging compounds.

[0006] Most commonly, oxygen scavengers are based on iron powder contained in a pouch. However, a number of problems are associated with this. Iron-containing pouches pose health risks to consumers due to accidental ingestion, cannot be used with liquid products, can ignite when heated in a microwave, and are detected by metal detectors on packaging lines. Furthermore, the presence of water is required to activate the iron. Therefore, the use of iron-containing oxygen scavengers is generally limited to food packaging whose atmosphere contains at least 65% relative humidity (RH). For lower humidity applications, hygroscopic sodium chloride must be added, but this eventually dries out the food, leading to deterioration in food quality.

[0007] As an alternative, palladium-based oxygen scavengers have been proposed. However, these oxygen scavengers are expensive and can be deactivated by sulfur components, particularly in meat products. Furthermore, the maximum acceptable amount of H₂ in packaging limits the labeling capacity of such scavengers. Sulfite-based oxygen scavengers can cause a degradation of odor and food aroma, while aluminum-based oxygen scavengers can be easily deactivated. Additionally, oxidizable polymers have been proposed as oxygen scavengers.

[0008] In addition, natural compounds such as polyphenols, plant extracts, tocopherols, and ascorbic acid have been suggested as oxygen scavengers for food packaging applications. For example, Ahn et al. (Journal of Applied Polymer Science 2016, 44138, doi: 10.1002 / app.44138) described an LDPE film coextruded with an oxygen scavenging system consisting of gallic acid (2,3,4-trihydroxybenzoic acid) and potassium carbonate, which adsorbed oxygen from ambient air at 95% rH. Similarly, Pant et al. (Materials 2017, 10, 489, doi: 10.3390 / ma10050489) disclosed a thermoformed tray containing a bio-based polyethylene layer containing gallic acid and sodium carbonate, which adsorbed oxygen from an oxygen / nitrogen mixture (20 / 80% by volume) at 75% rH and above. Similarly, EP2305375 A1 relates to an oxygen absorbing film comprising a thermoplastic polymer, gallic acid, a transition metal compound, and optionally an alkali metal carbonate. Application KR101935245 B1 relates to an oxygen scavenging film comprising polyethylene, a phenolic compound, and a sodium salt. Document JPH1015385 A relates to an oxygen absorbing resin comprising a polymer, gallic acid, and sodium carbonate.

[0009] However, prior art polyphenol-based oxygen scavenging elements are limited to high humidity applications. Furthermore, the inventors surprisingly discovered that prior art polyphenol-based oxygen scavengers are deactivated by the presence of carbon dioxide, making them unsuitable for MAP applications. However, MAP is a very common technology, for example in meat packaging applications, where low residual oxygen levels are particularly desirable to reduce discoloration and microbial contamination of food.

[0010] In view of the foregoing, there is a need for food-safe oxygen scavengers that overcome the above-mentioned disadvantages and that are particularly compatible with low-humidity food packaging and MAP. Summary of the Invention

[0011] Therefore, the object of the present invention is to provide a food-safe oxygen scavenger which effectively reduces the amount of oxygen in food packaging, preferably also at low relative humidity and / or in the presence of carbon dioxide. The oxygen scavenger should be easy to handle and easy to incorporate into food packaging.

[0012] These and other objects are achieved by the inventive set, the inventive activated sheetlike element, the inventive method, the inventive supply device, the inventive food packaging and the inventive use.

[0013] According to a first aspect of the present invention, there is provided a kit for improving the shelf life of food. The kit comprises

[0014] a) a chip component assembly having

[0015] a1) a coating layer comprising

[0016] i) a particulate filler in an amount of 25 to 70% by weight, based on the total dry weight of the coating layer,

[0017] wherein the particulate filler comprises surface-reacted calcium carbonate in an amount of at least 50% by weight, based on the total amount of the particulate filler,

[0018] The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + The reaction product of the ion donor, wherein the carbon dioxide is passed through H3O + The ion donor process is formed in situ and / or supplied from an external source, and

[0019] The surface-reacted calcium carbonate has a specific surface area of ​​20-200 m2 measured by the BET method. 2 / g,

[0020] ii) a polymeric binder in an amount of 5 to 25% by weight based on the total dry weight of the coating layer, and

[0021] iii) at least one oxygen scavenger in an amount of 25 to 70% by weight, based on the total dry weight of the coating layer,

[0022] wherein the at least one oxygen scavenger is a compound having at least one benzene ring with at least two phenolic hydroxyl groups and at least one group R, wherein two of the at least two phenolic hydroxyl groups are arranged on the at least one benzene ring in an ortho or para position relative to each other, and wherein R is selected from the group consisting of a hydrogen atom, a hydroxyl group, an alkoxy group, an aryloxy group, an amino group, an alkyl group, an aryl group, and -YR 1 group, preferably, wherein R is -YR 1 group, in which

[0023] -Y is selected from a direct bond, a linear or branched alkylene group having 1 to 6 carbon atoms and

[0024] -CH=CH- group, preferably, Y is a direct bond, and

[0025] -R 1 is an alkoxycarbonyl group, an aryloxycarboxyl group, or a substantially completely deprotonated carboxyl group, and

[0026] a2) basal layer, and

[0027] b) a basic component comprising a compound having a pK of 6 or less b Value of base.

[0028] The inventor has surprisingly found that, due to the interaction of contained compounds, the coating of the sheet element of the present invention's suit provides a specific porous structure. This surface-reacted calcium carbonate has high BET surface area and high porosity and is especially capable of accommodating oxygen scavengers. This oxygen scavenger is a polyphenol compound that can react with oxygen once activated. The amount of the binding agent is selected so that this coating has enough adhesion and uniform distribution on this substrate, wherein the hole of this surface-reacted calcium carbonate remains accessible (accessible). The relative amount of the granular filler, the binding agent and the oxygen scavenger is selected so that this coating keeps a porous structure. Therefore, it is intended to mix with water to form this alkaline component containing water and can be added to this sheet element and deposited in its hole, thereby the oxygen scavenger of this sheet element is activated due to at least the partial deprotonation of phenolic hydroxyl groups. Subsequently, the activated sheet element can be placed in food packaging to remove oxygen. Therefore, this sheet element can be stored before its activation without the need for moisture and / or oxygen to be sealed and shielded, thereby further simplifying its use.

[0029] Additionally, the coating is physically separated from the food and does not contaminate it, in contrast to powders of porous carrier materials loaded with oxygen scavengers, which tend to be distributed throughout the food package. Since the oxygen scavenger does not have to be processed with the polymer mixture during the extrusion step to incorporate it into the package, it also avoids processing the oxygen scavenger at high temperatures and preventing a portion of the oxygen scavenger from remaining inaccessible to oxygen.

[0030] Furthermore, the inventors have discovered that the ability of the coating to accommodate large amounts of water from the aqueous alkaline component allows for improved oxygen scavenging activity even at low humidity levels. Furthermore, it has surprisingly been found that the activated sheetlike element substantially retains its oxygen scavenging activity in the presence of carbon dioxide and can be used in combination with MAP.

[0031] A second aspect of the present invention relates to an activated sheetlike element formed from the kit of the present invention by adding the alkaline component to the coating layer of the sheetlike element assembly, wherein the activated sheetlike element comprises the reaction product of the at least one oxygen scavenger and the base, wherein preferably

[0032] - the basic component is added in an amount such that the base is added in an amount of at least 0.01 molar equivalents, preferably at least 0.02 molar equivalents, more preferably at least 0.05 molar equivalents, even more preferably at least 0.1 molar equivalents, based on the molar amount of the oxygen scavenger, and / or

[0033] The amount of the basic component added is 10-70% by weight, preferably 20-65% by weight, more preferably 35-60% by weight, based on the total weight of the coating layer.

[0034] As mentioned above, the activated sheetlike element is also able to effectively scavenge oxygen at low relative humidity and / or in the presence of carbon dioxide. Furthermore, the inventors have found that the addition of a base in a relatively small, substoichiometric (ie catalytic) amount relative to the oxygen scavenger is sufficient.

[0035] A third aspect of the present invention relates to a method for manufacturing a kit for improving the shelf life of food. The method comprises the following steps:

[0036] a) providing a particulate filler comprising surface-reacted calcium carbonate in an amount of at least 50% by weight, based on the total amount of the particulate filler,

[0037] The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + The reaction product of the ion donor, wherein the carbon dioxide is passed through H3O + The ion donor process is formed in situ and / or supplied from an external source, and

[0038] The surface-reacted calcium carbonate has a specific surface area of ​​20-200 m2 measured by the BET method. 2 / g, preferably 50-120m 2 / g,

[0039] b) providing at least one oxygen scavenger, the at least one oxygen scavenger being a compound having at least one benzene ring with at least two phenolic hydroxyl groups and at least one group R, wherein two of the at least two phenolic hydroxyl groups are located on the at least one benzene ring in an ortho or para position relative to each other, and wherein R is selected from the group consisting of a hydrogen atom, a hydroxyl group, an alkoxy group, an aryloxy group, an amino group, an alkyl group, an aryl group, and -YR 1 group, preferably, wherein R is -YR 1 group, in which

[0040] -Y is selected from a direct bond, a linear or branched alkylene group having 1 to 6 carbon atoms and

[0041] -CH=CH- group, preferably, Y is a direct bond, and

[0042] -R 1 is an alkoxycarbonyl group, an aryloxycarboxyl group or a substantially completely deprotonated carboxyl group,

[0043] c) providing a polymer binder,

[0044] d) providing a substrate layer comprising one or more individual substrate layers or a food packaging comprising the substrate layer,

[0045] e) mixing the oxygen scavenger of step b), the particulate filler of step a) and the polymeric binder of step c) in the order given therein to obtain a coating composition,

[0046] f) applying the coating composition of step e) to the substrate layer of step d) to obtain a sheet-like element precursor,

[0047] g) drying the sheet-like element precursor obtained in step f) to obtain a sheet-like element assembly,

[0048] h) providing a basic component comprising a compound having a pK of 6 or less b value of base, and optionally

[0049] i) mixing the alkaline component of step h) with water to obtain an aqueous alkaline component comprising the base and water, wherein preferably,

[0050] - the pH of the aqueous alkaline component is at least 8, more preferably at least 10, even more preferably at least 11, and most preferably at least 12, and / or

[0051] - the aqueous alkaline component comprises the base in an amount of 1 to 75 wt%, more preferably 5 to 60 wt% and most preferably 10 to 35 wt%, based on the total weight of the aqueous alkaline component.

[0052] In a fourth aspect of the present invention, a method for manufacturing a sheet element assembly is provided. The method comprises the following steps:

[0053] a) providing a particulate filler comprising surface-reacted calcium carbonate in an amount of at least 50% by weight, based on the total amount of the particulate filler,

[0054] The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + The reaction product of the ion donor, wherein the carbon dioxide is passed through H3O + The ion donor process is formed in situ and / or supplied from an external source, and

[0055] The surface-reacted calcium carbonate has a specific surface area of ​​20-200 m2 measured by the BET method. 2 / g, preferably 50-120m 2 / g,

[0056] b) providing at least one oxygen scavenger, the at least one oxygen scavenger being a compound having at least one benzene ring with at least two phenolic hydroxyl groups and at least one group R, wherein two of the at least two phenolic hydroxyl groups are located on the at least one benzene ring in an ortho or para position relative to each other, and wherein R is -YR 1group, in which

[0057] -Y is selected from a direct bond, a linear or branched alkylene group having 1 to 6 carbon atoms and

[0058] -CH=CH- group, preferably, Y is a direct bond, and

[0059] -R 1 is a carboxyl group that is essentially completely deprotonated,

[0060] c) providing a polymer binder,

[0061] d) providing a substrate layer comprising one or more individual substrate layers or a food packaging comprising the substrate layer,

[0062] e) mixing the oxygen scavenger of step b), the particulate filler of step a) and the polymeric binder of step c) in the order given therein to obtain a coating composition,

[0063] f) applying the coating composition of step e) onto the substrate layer of step d) to obtain a sheet-like element precursor, and

[0064] g) drying the sheet-like element precursor obtained in step f) to obtain a sheet-like element assembly,

[0065] wherein step b) of providing the at least one oxygen scavenger comprises the following sub-steps:

[0066] b1) providing at least one oxygen scavenger precursor, which is a compound having at least one benzene ring with at least two phenolic hydroxyl groups and at least one group R, wherein two of the at least two phenolic hydroxyl groups are located on the at least one benzene ring in an ortho- or para-position relative to each other, and wherein R is -YR 1 group, in which

[0067] -Y is selected from a direct bond, a linear or branched alkylene group having 1 to 6 carbon atoms and

[0068] -CH=CH- group, preferably, Y is a direct bond, and

[0069] -R 1 It is a carboxyl group,

[0070] b2) providing a basic compound, and

[0071] b3) reacting the carboxyl group of the oxygen scavenger precursor of step b1) with the basic compound of step b2) to obtain the oxygen scavenger.

[0072] The inventors have discovered that compounds having at least one benzene ring with at least two phenolic hydroxyl groups and at least one R group can be used as oxygen scavengers according to the invention. However, it has surprisingly been found that if such compounds contain carboxyl groups (—COOH), as is often the case with naturally occurring polyphenols, the carboxyl groups react with the surface-reacted calcium carbonate of the particulate filler, thereby destroying its pores and reducing the oxygen scavenging activity of the activated sheetlike elements thus obtained. The inventors have surprisingly found that this can be avoided if such carboxyl groups are converted into essentially completely deprotonated carboxyl groups by reaction with a basic compound before being incorporated into the sheetlike element assembly according to the invention.

[0073] A fifth aspect of the present invention relates to a method for activating an assembly of sheet-like elements of the present invention in a set according to the present invention. The method comprises the following steps:

[0074] j) mixing the alkaline component with water to obtain an aqueous alkaline component comprising the base and water, and

[0075] k) applying the aqueous alkaline component to at least a portion of the surface of the coating layer, wherein preferably,

[0076] - the basic component is added or applied in an amount such that the base is added in an amount of at least 0.01 molar equivalents, preferably at least 0.02 molar equivalents, more preferably at least 0.05 molar equivalents, even more preferably at least 0.1 molar equivalents, based on the molar amount of the oxygen scavenger, and / or

[0077] - the amount of the basic component added is 10-70% by weight, preferably 20-65% by weight, more preferably 35-60% by weight, based on the total weight of the coating layer, and / or

[0078] - the applying step k) is performed by inkjet printing, spraying, coating and / or dripping.

[0079] In a sixth aspect of the invention, a supply device containing activated sheet-like elements is provided, wherein the supply device protects the activated sheet-like elements from the influence of oxygen and preferably comprises a roll, a stack, a magazine or a package, such as a box.

[0080] The sheetlike element according to the invention can be provided in preactivated form, wherein it is protected from the influence of oxygen by the supply device according to the invention.

[0081] A seventh aspect of the present invention relates to a food packaging comprising the activated sheetlike element according to the invention, wherein the coating layer is present within the food packaging.

[0082] An eighth aspect of the present invention relates to the use of the kit according to the invention and / or the activated sheetlike element according to the invention in food packaging.

[0083] A ninth aspect of the present invention relates to the use of the kit according to the invention and / or the activated sheetlike element according to the invention for extending the shelf life of food products.

[0084] Advantageous embodiments of the invention are defined in the corresponding dependent claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0085] Figure 1 Shown includes a coating weight of 22g / m 2 Oxygen scavenging rate (OSR) of activated sheet-like elements having a gallic acid-based coating according to the present invention. The sheets were activated with different aqueous alkaline solutions made with different concentrations of K2CO3, Na2CO3, or NaOH. The OSR is the total amount of oxygen scavenged (in mL) per gram of calcium gallate (CGA) during the measurement period (in days).

[0086] Figure 2 An exemplary continuous laboratory coater for coating sheetlike elements is shown (1 = rewind, 2 = hot air dryer, 3 = IR-dryer, 4 = rod / blade, 5 = unwind (for rod / blade), 6 = metering size press, 7 = unwind (for metering size press). DETAILED DESCRIPTION

[0087] It should be understood that for the purposes of the present invention, the following terms have the following meanings.

[0088] The kit is "suitable for improving the shelf life of food" in that the kit and its components, when placed in a food package, do not negatively affect the edibility of the food contained in the food package. Therefore, any compound used in the sheet-like element of the present invention is a food-safe compound, i.e., a compound that does not release any or any significant amount of toxic or harmful substances or pathogenic microorganisms into the food.

[0089] "Improvement of the shelf life of food" is broadly understood to mean that at least one of the properties of the food in the food package (preferably texture, color, taste, nutritional value and / or edibility) is retained for a longer period of time compared to the same food in the same food package without the activated sheet-like element of the present invention. The terms "improve", "extend" or "increase" the shelf life of food are used synonymously herein.

[0090] "Pathogenic microorganism" is understood to be at least one bacterial strain and / or at least one yeast strain and / or at least one mold strain, which may be present in food and which, when ingested, may cause foodborne illness.

[0091] The surface-reacted calcium carbonate according to the present invention is prepared by reacting carbon dioxide and one or more H3O +The reaction product of ion donor treated ground natural calcium carbonate (GNCC) or precipitated calcium carbonate (PCC) wherein the carbon dioxide is reacted with H3O + The ion donor is formed in situ and / or supplied from an external source. In the context of the present invention, H3O + The ion donor is a Bronsted acid and / or an acid salt.

[0092] If not explicitly stated otherwise, the "particle size" of the surface-reacted calcium carbonate herein is described as the volume-based particle size distribution d x (vol) or d x In which, the value d x (vol) represents the diameter at which x% of the volume of particles have a diameter smaller than d x (vol). This means that for example d 20 The (vol) value refers to the particle size where 20% by volume of all particles are smaller than that particle size. 50 The (vol) value is thus the volume median particle size, also called the average particle size, ie the particle size below which 50% by volume of all particles are smaller, and is also called the volume-based top-cut particle size d 98 The (vol) value refers to the particle size where 98% by volume of all particles are smaller than that particle size.

[0093] Volume median particle size d 50 The d was measured using a Malvern Mastersizer 3000 laser diffraction system. 50 or d 98 The value indicates the diameter value at which 50% or 98% of the volume of the particles, respectively, have a diameter smaller than this value. The raw data obtained by the measurement were analyzed using Mie theory with a particle refractive index of 1.57 and an absorption index of 0.005.

[0094] If particle sizes are given herein as weight-based particle sizes, then for example d 20 The (wt) value refers to the particle size where 20% by weight of all particles are smaller than that particle size. 50 The (wt) value is thus the weight median particle size, ie the particle size below which 50% by weight of all particles are smaller, and is also referred to as the weight-based top cut particle size d 98 The (wt) value refers to the particle size below which 98% by weight of all particles are smaller than that particle size.

[0095] Weight basis median particle size d 50 (wt) and top cut d98 (wt) was measured by sedimentation method, which is the analysis of sedimentation behavior in a gravitational field. TM The measurements were performed at 5120 nm. The methods and instruments are known to those skilled in the art and are commonly used for determining particle size distribution. The measurements were performed in a 0.1% by weight aqueous solution of Na₄P₂O₇. The samples were dispersed using a high-speed stirrer and ultrasonic treatment.

[0096] "Porosity" or "pore volume" when used in relation to particulate fillers and surface-reacted calcium carbonate refers to the intra-particle intrusive specific pore volume. The term "porosity" or "pore volume" when used in relation to a coating refers to the total intrusive specific pore volume, which is the sum of the total intra-particle intrusive specific pore volume, the total inter-particle intrusive specific pore volume and the total occluded intrusive specific pore volume. In the context of the present invention, the term "pores" is understood to describe the spaces found between and / or within particles, i.e. the spaces formed by particles when they are packed together in nearest neighbor contact (inter-particle pores), for example in powders or compacts or coatings, and / or the void spaces within porous particles (intra-particle pores), which, when saturated with a liquid, allow the passage of liquid under pressure and / or support the absorption of a surface wetting liquid.

[0097] Throughout this document, the term "specific surface area" (in m2) is used to define surface-reacted calcium carbonate or other materials. 2 The specific surface area (expressed in % by weight) is determined by the BET method (using nitrogen as the adsorption gas) according to ISO 9277:2010.

[0098] An "oxygen scavenger" within the meaning of the present invention is considered to be a chemical or biological compound that is capable of reacting with oxygen, thereby reducing the oxygen content in the surrounding atmosphere. An "oxygen scavenging element" is considered to be an assembly, such as a pouch, carrier, plastic film, label, or plastic tray, that contains an oxygen scavenger in either or both an inactive and an activated form. For example, the sheet-like element assembly and activated sheet-like element of the present invention represent oxygen scavenging elements. "Oxygen scavenging activity" broadly refers to the ability of an oxygen scavenger or oxygen scavenging element to react with oxygen, thereby reducing its amount in the surrounding atmosphere.

[0099] When reference is made hereinafter to a "sheet-like element", it is to be understood that the term encompasses both the nested sheet-like element assembly and the activated sheet-like element.

[0100] "Relative humidity" refers to the ratio of the partial pressure of water vapor to the equilibrium vapor pressure of water at the storage temperature of the food and / or food packaging (eg, approximately room temperature or 5±1°C).

[0101] When the term "comprising" is used in this specification and claims, it does not exclude other, not specifically stated, elements of major or minor functional importance. For the purposes of the present invention, the term "consisting of" is to be considered a preferred embodiment of the term "comprising". If a group is defined below as comprising at least a certain number of embodiments, this is also to be understood as disclosing a group that preferably consists only of these embodiments.

[0102] Wherever the terms "including" or "having" are used, these terms are considered equivalent to "comprising" as defined above.

[0103] Where an indefinite or definite article such as "a", "an" or "the" is used when referring to a singular noun, this includes a plural of that noun unless something else is specifically stated.

[0104] Terms such as "obtainable" or "definable" and "obtained" or "defined" are used interchangeably. This means, for example, that unless the context clearly indicates otherwise, the term "obtained" is not meant to indicate, for example, that an embodiment must be obtained by, for example, the sequence of steps following the term "obtained," although the term "obtained" or "defined" always includes such a restrictive understanding as a preferred embodiment.

[0105] When reference is made above or below to preferred embodiments or technical details of the kit according to the invention, it is to be understood that these preferred embodiments or technical details also relate to the activated sheet element according to the invention, the method according to the invention, the supply device according to the invention, the food packaging according to the invention and the use according to the invention (as far as applicable).

[0106] Surface-reacted calcium carbonate

[0107] The inventive set, the inventive activated sheetlike element, the inventive method, the inventive supply device, the inventive food packaging and the inventive use involve the use of surface-reacted calcium carbonate (SRCC).

[0108] The surface-reacted calcium carbonate is a mixture of natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + The reaction product of the ion donor, wherein the carbon dioxide is passed through H3O + The ion donor process is formed in situ and / or supplied from an external source.

[0109] In the context of the present invention, H3O + The ion donor is a Bronsted acid and / or an acid salt.

[0110] In a preferred embodiment of the present invention, the surface-reacted calcium carbonate is obtained by a process comprising the steps of: (a) providing a suspension of natural or precipitated calcium carbonate, (b) adding to the suspension of step a) at least one calcium carbonate having a pK of 0 or less at 20°C. a value or a pK value of 0-2.5 at 20°C a (i) the at least one acid of step B) has a pK value greater than 2.5 and less than or equal to 7 at 20° C. a , the pK a associated with the ionization of its first available hydrogen and, upon loss of this first available hydrogen, forming a corresponding anion capable of forming a water-soluble calcium salt, and (ii) after contacting the at least one acid with natural or precipitated calcium carbonate, additionally providing at least one water-soluble salt which, in the case of a hydrogen-containing salt, has a pK greater than 7 at 20°C a (the pK a associated with the ionization of the first available hydrogen), and its salt anion is capable of forming a water-insoluble calcium salt.

[0111] "Natural ground calcium carbonate (GCC)" is preferably selected from calcium carbonate-containing minerals selected from marble, chalk, limestone and mixtures thereof. Natural calcium carbonate may further contain naturally occurring components such as aluminosilicates and the like.

[0112] Typically, the grinding of natural ground calcium carbonate can be a dry or wet grinding step and can be, for example, carried out with any traditional grinding device under the condition that pulverization is mainly produced by using auxiliary body impact, that is, in one or more of the following, carry out: ball mill, rod mill, vibrating mill, crusher, centrifugal impact mill, vertical bead mill, attritor, pin crusher, hammer mill, pulverizer, shredder, deblocker, cutter (knife cutter) or other such equipment well known to those skilled in the art. In the case where calcium carbonate-containing mineral material comprises the calcium carbonate-containing mineral material of wet grinding, the grinding step can be carried out under the condition that autogenous grinding occurs and / or by horizontal ball milling and / or other such methods well known to those skilled in the art. The calcium carbonate-containing mineral material of the grinding through wet processing thus obtained can be, for example, washed and dehydrated by flocculation, filtration or forced evaporation (before drying). Subsequent drying step (if necessary) can be carried out in a single step (for example spray drying), or in at least two steps, carry out. Also commonly, this mineral material carries out a beneficiation step (for example flotation, bleaching or magnetic separation step) to remove impurities.

[0113] " precipitated calcium carbonate " (PCC) in the meaning of the present invention is synthetic material, usually by precipitation after carbon dioxide and calcium hydroxide reaction in aqueous environment or by calcium ion and carbonate ion (for example, CaCl And Na CO ) be precipitated out and obtain from solution.Other possible modes of producing PCC are lime soda process, or Solvay process, and wherein PCC is the by product of ammonia production.Precipitated calcium carbonate exists with three kinds of elementary crystalline forms: calcite, aragonite and vaterite, and for each crystalline form in these crystalline forms, there are many different polymorphs (crystal habit).Calcite has triangular structure, and this triangular structure has typical crystal habit as scalenohedral (S-PCC), rhombohedral (R-PCC), hexagonal prism, axial face, colloid (C-PCC), cubic and prismatic (P-PCC). Aragonite has an orthorhombic structure with a typical crystal habit of paired hexagonal prisms, as well as various forms such as elongated prisms, curved blades, steep cones, chisel-pointed crystals, branching trees, and coral or worm-like forms. Vaterite belongs to the hexagonal system. The resulting PCC slurry can be mechanically dehydrated and dried.

[0114] According to one embodiment of the present invention, the precipitated calcium carbonate is a precipitated calcium carbonate preferably comprising aragonite, vaterite or calcite mineral crystal forms or mixtures thereof.

[0115] Precipitated calcium carbonate can be prepared by mixing carbon dioxide and at least one H3O + The ion donor treatment is preceded by grinding in the same manner as used for grinding natural calcium carbonate as described above.

[0116] According to one embodiment of the present invention, the natural or precipitated calcium carbonate is in the form of particles having a weight median particle size d 50 0.05-10.0 μm, preferably 0.2-5.0 μm, more preferably 0.4-3.0 μm, most preferably 0.6-1.2 μm, especially 0.7 μm. According to another embodiment of the present invention, the natural or precipitated calcium carbonate is in the form of particles having a top cut particle size d 98 It is 0.15-55 μm, preferably 1-40 μm, more preferably 2-25 μm, most preferably 3-15 μm, especially 4 μm.

[0117] The natural and / or precipitated calcium carbonate can be used dry or suspended in water. Preferably, the corresponding slurry has a content of natural or precipitated calcium carbonate in the range of 1% by weight to 90% by weight, more preferably 3% by weight to 60% by weight, even more preferably 5% by weight to 40% by weight and most preferably 10% by weight to 25% by weight, based on the weight of the slurry.

[0118] The one or more H3O for preparing surface-reacted calcium carbonate + The ion donor can be H3O generated under the preparation conditions + ions of any strong acid, medium strong acid or weak acid or a mixture thereof. According to the present invention, the at least one H3O + The ion donor can also be H3O generated under the preparation conditions + Acid salts of ions.

[0119] According to one embodiment, the at least one H3O + The ion donor is an ion having a pK of 0 or less at 20°C. a Value of strong acid.

[0120] According to another embodiment, the at least one H3O + The ion donor is an ion donor having a pK of 0-2.5 at 20°C. a If the pK at 20℃ a If the pK at 20°C is 0 or less, the acid is preferably selected from sulfuric acid, hydrochloric acid or a mixture thereof. a is 0-2.5, then the H3O + The ion donor is preferably selected from H2SO3, H3PO4, oxalic acid, or a mixture thereof. + The ion donor can also be an acid salt, such as HSO4 - or H2PO4 - , which is achieved by the corresponding cations such as Li + 、Na + or K + At least partially neutralized, or HPO42- , which is achieved by the corresponding cations such as Li + 、Na + , K + Mg 2+ or Ca 2+ At least partially neutralized. The at least one H3O + The ion donor may also be a mixture of one or more acids and one or more acid salts.

[0121] According to yet another embodiment, the at least one H3O + The ion donor is a weak acid having a pK greater than 2.5 and less than or equal to 7 when measured at 20°C. a value (associated with the ionization of the first available hydrogen) and having a corresponding anion capable of forming a water-soluble calcium salt. Thereafter, at least one water-soluble salt is additionally added which, in the case of a hydrogen-containing salt, has a pK greater than 7 when measured at 20°C. a (associated with the ionization of the first available hydrogen) and its salt anion is capable of forming a water-insoluble calcium salt. According to a preferred embodiment, the weak acid has a pK of 2.5-5 at 20°C. a The water-soluble salt is preferably selected from the group consisting of acetic acid, formic acid, propionic acid, and mixtures thereof. In an exemplary embodiment, the water-soluble salt comprises an ion selected from the group consisting of potassium, sodium, lithium, and mixtures thereof. In an even more preferred embodiment, the cation is sodium or potassium. In an exemplary embodiment, the water-soluble salt comprises an anion selected from the group consisting of phosphate, dihydrogen phosphate, monohydrogen phosphate, oxalate, silicate, mixtures thereof, and hydrates thereof. In an even more preferred embodiment, the anion is selected from the group consisting of phosphate, dihydrogen phosphate, monohydrogen phosphate, mixtures thereof, and hydrates thereof. In an even more preferred embodiment, the anion is selected from the group consisting of dihydrogen phosphate, monohydrogen phosphate, mixtures thereof, and hydrates thereof. The addition of the water-soluble salt may be performed dropwise or in a single step. In the case of dropwise addition, the addition preferably occurs over a period of 10 minutes. More preferably, the salt is added in a single step.

[0122] According to one embodiment of the present invention, the at least one H3O + The ion donor is selected from hydrochloric acid, sulfuric acid, sulfurous acid, phosphoric acid, citric acid, oxalic acid, acetic acid, formic acid and mixtures thereof. Preferably, the at least one H3O + Ion donors are selected from hydrochloric acid, sulfuric acid, sulfurous acid, phosphoric acid, oxalic acid, H2PO4 - (which is achieved by the corresponding cations such as Li + 、Na + or K + at least partially neutralized), HPO4 2- (which is achieved by the corresponding cations such as Li + 、Na + , K+ Mg 2+ or Ca 2+ at least partially neutralized), and mixtures thereof, more preferably, the at least one acid is selected from hydrochloric acid, sulfuric acid, sulfurous acid, phosphoric acid, oxalic acid or mixtures thereof, and most preferably, the at least one H3O + The ion donor is phosphoric acid.

[0123] The one or more H3O + The ion donor can be added to the suspension as a concentrated solution or a more dilute solution. + The molar ratio of ion donor to the natural or precipitated calcium carbonate is from 0.01 to 4, more preferably from 0.02 to 2, even more preferably from 0.05 to 1 and most preferably from 0.1 to 0.58.

[0124] Alternatively, the H3O can be added before suspending the natural or precipitated calcium carbonate. + An ion donor is added to the water.

[0125] In the next step, the natural or precipitated calcium carbonate is treated with carbon dioxide. If a strong acid such as sulfuric acid or hydrochloric acid is used for the H3O + Alternatively or additionally, carbon dioxide may be supplied from an external source.

[0126] H3O + The ion donor treatment and the treatment with carbon dioxide can be carried out simultaneously, as is the case when strong or medium-strong acids are used. It is also possible to carry out the H3O treatment first. + Ion donor treatment, for example, using an ion donor having a pK in the range of 0 to 2.5 at 20°C. a The carbon dioxide is formed in situ by the medium-strong acid, and therefore the carbon dioxide treatment will automatically react with H3O + Ion donor treatment is performed simultaneously, followed by additional treatment with carbon dioxide supplied from an external source.

[0127] In a preferred embodiment, H3O + The ion donor treatment step and / or the carbon dioxide treatment step are repeated at least once, more preferably a plurality of times. According to one embodiment, the at least one H3O is added for a period of at least about 5 minutes, preferably at least about 10 minutes, typically about 10 to about 20 minutes, more preferably about 30 minutes, even more preferably about 45 minutes, and sometimes about 1 hour or longer. + ion donor.

[0128] In H3O +After the ion donor treatment and the carbon dioxide treatment, the pH value of the aqueous suspension measured at 20°C naturally reaches a value greater than 6.0, preferably greater than 6.5, more preferably greater than 7.0, even more preferably greater than 7.5, thereby preparing the surface-reacted natural or precipitated calcium carbonate as an aqueous suspension having a pH value greater than 6.0, preferably greater than 6.5, more preferably greater than 7.0, even more preferably greater than 7.5.

[0129] In a particularly preferred embodiment, the surface-reacted calcium carbonate is the reaction product of natural ground calcium carbonate (GNCC) with carbon dioxide and phosphoric acid, wherein the carbon dioxide is formed in situ by the phosphoric acid treatment.

[0130] Further details on the preparation of surface-reacted natural calcium carbonate are disclosed in WO0039222 A1, WO2004083316 A1, WO2005121257 A2, WO2009074492 A1, EP2264108 A1, EP2264109 A1 and US20040020410 A1, the contents of these references are hereby included in the present application.

[0131] Similarly, surface-reacted precipitated calcium carbonate is obtained. As can be seen in detail from WO2009074492 A1, surface-reacted precipitated calcium carbonate is obtained by reacting precipitated calcium carbonate with H3O + ions and contacting in an aqueous medium with an anion dissolved in the aqueous medium and capable of forming a water-insoluble calcium salt to form a slurry of surface-reacted precipitated calcium carbonate, wherein the surface-reacted precipitated calcium carbonate comprises an insoluble, at least partially crystallized calcium salt of the anion formed on the surface of at least a portion of the precipitated calcium carbonate.

[0132] The dissolved calcium ions correspond to the amount of calcium ions dissolved by H3O relative to the amount of calcium carbonate precipitated. + ions dissolved and naturally occurring dissolved calcium ions in excess of dissolved calcium ions, wherein the H3O + The ion is provided only in the form of a counterion to the anion, ie via addition of an acid or an anion in the form of a non-calcium acid salt, and without any additional calcium ions or sources of calcium ion generation.

[0133] The excess dissolved calcium ions are preferably provided by the addition of a soluble neutral or acidic calcium salt, or by the addition of an acid or a neutral or acidic non-calcium salt which generates a soluble neutral or acidic calcium salt in situ.

[0134] The H3O + The ions may be provided by the addition of an acid or acid salt of the anion, or by the addition of an acid or acid salt which simultaneously provides all or part of the excess dissolved calcium ions.

[0135] In a preferred embodiment for the preparation of surface-reacted natural or precipitated calcium carbonate, natural or precipitated calcium carbonate is reacted with the one or more H3O in the presence of at least one compound selected from the group consisting of + Ion donor and / or carbon dioxide reaction: silicate, silicon dioxide, aluminum hydroxide, alkaline earth aluminate such as sodium aluminate or potassium aluminate, magnesium oxide or a mixture thereof. Preferably, the at least one silicate is selected from aluminum silicate, calcium silicate or alkaline earth metal silicate. These components can be added to the one or more H3O + The ion donor and / or carbon dioxide are previously added to the aqueous suspension comprising natural or precipitated calcium carbonate.

[0136] Alternatively, the silicate and / or silicon dioxide and / or aluminum hydroxide and / or alkaline earth aluminate and / or magnesium oxide components may be present in the presence of natural or precipitated calcium carbonate and the one or more H3O + The ion donor and carbon dioxide are added to an aqueous suspension of natural or precipitated calcium carbonate once the reaction has already begun. Further details on the preparation of surface-reacted natural or precipitated calcium carbonate in the presence of at least one silicate and / or silicon dioxide and / or aluminum hydroxide and / or alkaline earth aluminate component are disclosed in WO2004083316A1, the content of which is hereby incorporated by reference into the present application.

[0137] The surface-reacted calcium carbonate can be kept in a suspension state and optionally further stabilized by a dispersant. Conventional dispersants known to those skilled in the art can be used. Preferred dispersants include polyacrylic acid and / or carboxymethyl cellulose.

[0138] Alternatively, the above aqueous suspension may be dried, thereby obtaining solid (ie dry or containing little water that is not in fluid form) surface-reacted natural or precipitated calcium carbonate in the form of granules or powder.

[0139] The surface-reacted calcium carbonate has a BET specific surface area of ​​20-200 m2 measured using nitrogen and the BET method. 2 / g, preferably 50-120m 2 / g, more preferably 50-100m 2 / g. The BET specific surface area in the meaning of the present invention is defined as the surface area of ​​the particles divided by the mass of the particles. The specific surface area as used herein is measured using nitrogen adsorption using the BET isotherm (ISO 9277:2010) and is expressed in m 2 / g regulations.

[0140] Furthermore, it is also preferred that the surface-reacted calcium carbonate has a volume median particle size d of 0.1-75 μm, preferably 0.5-50 μm, more preferably 1-40 μm, even more preferably 1.2-30 μm and most preferably 1.5-15 μm. 50 (vol).

[0141] Furthermore, it may be preferred that the surface-reacted calcium carbonate has a volume top cut particle size d of 0.2-150 μm, preferably 1-100 μm, more preferably 2-80 μm, even more preferably 2.4-60 μm and most preferably 3-30 μm. 98 (vol) value.

[0142] Value d x represents the diameter at which x% of the particles have a diameter smaller than d x This means that d 98 The value refers to the particle size where 98% of all particles are smaller than this particle size. 98 The value is also called the "top cut". x Values ​​may be given as percentages by volume or weight. 50 The (weight) value is thus the weight median particle size, ie the particle size below which 50% by weight of all particles are smaller and d 50 The (volume) value is the volume median particle size, ie the particle size below which 50% by volume of all particles are smaller.

[0143] The volume median particle size d was estimated using a Malvern Mastersizer 3000 laser diffraction system. 50 d measured using a Malvern Mastersizer 3000 laser diffraction system 50 or d 98 The value indicates the diameter value at which 50% or 98% of the volume of the particles, respectively, have a diameter smaller than this value. The raw data obtained by the measurement were analyzed using Mie theory with a particle refractive index of 1.57 and an absorption index of 0.005.

[0144] The weight median particle size was measured by sedimentation, which is the analysis of sedimentation behavior in a gravitational field. A Sedigraph was used from Micromeritics Instrument Corporation. TM The measurements were performed at 5120°C. The methods and instruments are known to those skilled in the art and are commonly used for determining the particle size of fillers and pigments. The measurements were performed in a 0.1% by weight aqueous solution of Na₄P₂O₇. The samples were dispersed using a high-speed stirrer and ultrasound.

[0145] Methods and instruments are known to those skilled in the art and are commonly used to determine the particle size of fillers and pigments.

[0146] Preferably, the surface-reacted calcium carbonate has a porosity of 0.1-2.5 cm as determined by mercury porosimetry measurements. 3 / g, more preferably 0.2-2.2cm 3 / g, and more preferably 0.4-2.0cm 3 / g and most preferably 0.6-1.8cm 3 / g range of particle intrusion specific pore volume.

[0147] The specific pore volume was measured using mercury intrusion porosimetry measurements using a Micromeritics Autopore V 9620 mercury porosimeter with a maximum applied mercury pressure of 414 MPa (60,000 psi), equivalent to a Laplace throat diameter of 0.004 μm (~4 nm). The equilibrium time used at each pressure step was 20 seconds. The sample material was sealed in a 5 cm 3 The data were corrected for mercury compression, penetrometer expansion, and sample material compression using the software Pore-Comp (Gane, P.A.C., Kettle, J.P., Matthews, G.P., and Ridgway, C.J., "Void Space Structure of Compressible Polymer Spheres and Consolidated Calcium Carbonate Paper-Coating Formulations," Industrial and Engineering Chemistry Research, 35(5), 1996, pp. 1753-1764).

[0148] The total pore volume seen in the cumulative intrusion data can be divided into two regions, wherein the intrusion data from 214 μm down to about 1-4 μm shows the coarse packing of the sample between any agglomerated structures with a strong contribution. Below these diameters is the fine inter-particle packing of the particles themselves. If they also have intra-particle pores, this region appears bimodal, and by taking the specific pore volume of the pores finer than the peak inflection point (i.e. finer than the bimodal inflection point) intruded by mercury, the specific intra-particle pore volume is defined. The sum of these three regions gives the total overall pore volume of the powder, but is strongly dependent on the compaction of the original sample / sedimentation of the powder at the coarse pore end of the distribution.

[0149] By obtaining the first derivative of the cumulative intrusion curve, the pore size distribution based on the equivalent Laplace diameter is revealed, which necessarily includes pore shielding. The differential curve clearly shows the coarse agglomerate pore structure region, the interparticle pore region and the intraparticle pore region (if present). Given the intraparticle pore diameter range, the remaining interparticle and inter-agglomerate pore volume can be subtracted from the total pore volume to give the desired pore volume of the individual internal pores per unit mass pore volume (specific pore volume). Of course, the same subtraction principle is also applicable to separating any other pore size regions of interest.

[0150] The internal pore size of the particles of the surface-reacted calcium carbonate determined by mercury porosimetry is preferably in the range of 0.004-1.6 μm, more preferably in the range of 0.005-1.3 μm, especially preferably 0.006-1.15 μm and most preferably 0.007-1.0 μm.

[0151] In an exemplary embodiment, the surface-reacted calcium carbonate has a BET specific surface area of ​​20-200 m 2 / g, preferably 50-120m 2 / g, more preferably 50-100m 2 / g, and the volume median particle size d 50 (vol) is 0.1-75 μm, preferably 0.5-50 μm, more preferably 1-40 μm, even more preferably 1.2-30 μm and most preferably 1.5-15 μm.

[0152] In a particularly preferred embodiment of the present invention, the surface-reacted calcium carbonate is natural ground calcium carbonate with carbon dioxide and one or more H3O + The reaction product of the ion donor, wherein the carbon dioxide is passed through H3O + The ion donor process is formed in situ and / or supplied from an external source, and wherein the one or more H3O + The ion donor is phosphoric acid.

[0153] Thus, in an exemplary embodiment of the present invention, the surface-reacted calcium carbonate is a mixture of natural ground calcium carbonate and carbon dioxide and one or more H3O + The reaction product of the ion donor, wherein the carbon dioxide is passed through H3O + The ion donor process is formed in situ and / or supplied from an external source, and wherein the one or more H3O + The ion donor is phosphoric acid, and the surface-reacted calcium carbonate has a BET specific surface area of ​​20-200 m 2 / g, preferably 50-120m 2 / g, more preferably 50-100m 2 / g, and the volume median particle size d50 (vol) is 0.1-75 μm, preferably 0.5-50 μm, more preferably 1-40 μm, even more preferably 1.2-30 μm and most preferably 1.5-15 μm.

[0154] Should be understood that this surface reacted calcium carbonate can be a type of surface reacted calcium carbonate or a mixture of different types of surface reacted calcium carbonate. In one embodiment of the present invention, this surface reacted calcium carbonate comprises a type of surface reacted calcium carbonate, preferably consists of a type of surface reacted calcium carbonate. Alternatively, this surface reacted calcium carbonate comprises two or more types of surface reacted calcium carbonate, preferably consists of two or more types of surface reacted calcium carbonate. For example, this surface reacted calcium carbonate comprises two or three types of surface reacted calcium carbonate, preferably consists of two or three types of surface reacted calcium carbonate. Preferably, this surface reacted calcium carbonate comprises a type of surface reacted calcium carbonate, preferably consists of a type of surface reacted calcium carbonate.

[0155] It will be appreciated that the surface-reacted calcium carbonate as described herein comprises pores which, when present in the inventive coating of any aspect of the invention, are capable of accommodating a suitably large amount of oxygen scavenger. Furthermore, a portion of the intra-particle pores, inter-particle pores and coarse agglomerate pores of the surface-reacted calcium carbonate remains accessible to the aqueous alkaline composition, such that the sheet-like element can be readily activated by applying the aqueous alkaline composition in a sufficient amount.

[0156] Granular filler

[0157] The kit, the activated sheet-like element, the method, the supply device, the food packaging, and the use of the invention utilize a particulate filler. The particulate filler comprises the surface-reacted calcium carbonate in an amount of at least 50% by weight, based on the total amount of the particulate filler. The surface-reacted calcium carbonate is as defined above.

[0158] In a preferred embodiment of the present invention, the particulate filler comprises the surface-reacted calcium carbonate in an amount of at least 70% by weight, preferably at least 90% by weight, based on the total amount of the at least one particulate filler, and most preferably, the particulate filler consists of the surface-reacted calcium carbonate.

[0159] Thus, the particulate filler may comprise up to 50% by weight, preferably up to 30% by weight, more preferably up to 10% by weight of at least one additional particulate filler material. Preferably, the at least one additional particulate filler material has a weight median particle size d 50It is 0.1-75 μm, preferably 0.5-50 μm, more preferably 1-40 μm, even more preferably 1.2-30 μm, most preferably 1.5-15 μm.

[0160] In another embodiment of the present invention, the particulate filler comprises surface-reacted calcium carbonate in an amount of at least 50% by weight, based on the total amount of the particulate filler, and comprises at least one additional particulate filler material selected from the group consisting of dolomite, ground calcium carbonate, precipitated calcium carbonate, magnesium hydroxide, talc, gypsum, titanium dioxide, kaolin, silicates, mica, barium sulfate, calcined clay, uncalcined (hydrous) clay, bentonite, and mixtures thereof. Preferably, the at least one additional particulate filler material is selected from the group consisting of ground calcium carbonate, precipitated calcium carbonate, and mixtures thereof. In said embodiment, it is particularly preferred that the particulate filler consists of the at least one additional particulate filler material and the surface-reacted calcium carbonate. Thus, the particulate filler preferably consists of the surface-reacted calcium carbonate and the at least one additional particulate filler material in an amount of at least 50% by weight, preferably at least 70% by weight, more preferably at least 90% by weight, based on the total amount of the particulate filler, the at least one additional particulate filler material being selected from the group consisting of ground calcium carbonate, precipitated calcium carbonate, and mixtures thereof.

[0161] According to one embodiment of the present invention, the ground calcium carbonate or precipitated calcium carbonate is of a weight median particle size d 50 In the form of particles having a size of 0.05-10.0 μm, preferably 0.2-5.0 μm, more preferably 0.4-3.0 μm, most preferably 0.6-1.2 μm, in particular 0.7 μm. According to another embodiment of the present invention, the natural or precipitated calcium carbonate is in the form of particles having a size of 0.05-10.0 μm, preferably 0.2-5.0 μm, more preferably 0.4-3.0 μm, most preferably 0.6-1.2 μm, in particular 0.7 μm. 98 In the form of particles of 0.15-55 μm, preferably 1-40 μm, more preferably 2-25 μm, most preferably 3-15 μm, especially 4 μm.

[0162] polymer binder

[0163] The inventive kit, the inventive activated sheetlike element, the inventive method, the inventive supply device, the inventive food packaging and the inventive use utilize a polymeric binder.

[0164] Any suitable polymeric binder can be used in the coating of the present invention, wherein the binder according to the present invention should preferably be swellable. A person skilled in the art knows how to provide a suitable swellable binder, such as a swellable latex. The binder should be selected so that the pores of the surface-reacted calcium carbonate are not blocked and remain accessible to the oxygen scavenger and the aqueous alkaline component.

[0165] For example, the polymer binder can be a hydrophilic polymer such as polyvinyl alcohol, polyvinyl pyrrolidone, gelatin, cellulose ether, polyvinyl alcohol, polyvinyl pyrrolidone, In some embodiments, the present invention relates to a binder comprising a bismuth oxazoline, polyvinyl acetamide, partially hydrolyzed polyvinyl acetate / vinyl alcohol, polyacrylic acid, polyacrylamide, polyalkylene oxide, sulfonated or phosphorylated polyesters and polystyrene, casein, zein, albumin, chitin, chitosan, dextran, pectin, collagen derivatives, collodian, agar-agar, arrowroot, guar gum, carrageenan, starch, tragacanth, xanthan gum, alginate or rhamsan and mixtures thereof. Other binders such as hydrophobic materials, for example poly(styrene-to-butadiene), polyurethane latex, polyester latex, poly(n-butyl acrylate), poly(n-butyl methacrylate), poly(2-ethylhexyl acrylate), copolymers of n-butyl acrylate and ethyl acrylate, copolymers of vinyl acetate and n-butyl acrylate, etc. and mixtures thereof can also be used. Further examples of suitable binders are homopolymers or copolymers of acrylic acid and / or methacrylic acid, itaconic acid, and acid esters such as ethyl acrylate, butyl acrylate, styrene, unsubstituted or substituted vinyl chloride, vinyl acetate, ethylene, butadiene, acrylamide and acrylonitrile, silicone resins, water-reducible alkyd resins, acrylic / alkyd resin combinations, natural oils such as linseed oil, and mixtures thereof.

[0166] In a preferred embodiment of the present invention, the polymer binder is an alkali swellable binder. For the purposes of the present invention, an alkali swellable binder is understood to be a polymer binder that shows a significant increase in its Brookfield viscosity when the pH value is increased. Preferably, an aqueous solution comprising 50% by weight of an alkali swellable binder, based on the total weight of the aqueous solution, and having a pH of 4, increases its viscosity by at least 100%, preferably by at least 250%, more preferably by at least 500%, and most preferably by at least 750%, when the pH value of the aqueous solution is increased from 4 to 10, when measured by a Brookfield DV III Ultra viscometer at 24°C ± 3°C at 100 rpm using a suitable spindle of the Brookfield RV-spindle set. Preferred alkali swellable binders are polyacrylic acid or a salt thereof or a derivative thereof.

[0167] According to a preferred embodiment, the polymer binder is selected from polyacrylic acid, its salts, its derivatives, starch, protein, polyvinyl alcohol, styrene-butadiene latex, styrene-acrylate, polyvinyl acetate, polyolefin, ethylene-acrylate, microfibrillated cellulose, microcrystalline cellulose, nanocellulose, cellulose, carboxymethyl cellulose, bio-based latex, or a mixture thereof, and more preferably, the polymer binder is selected from polyacrylic acid, its salts, its derivatives, starch, protein, styrene-butadiene latex, polyvinyl alcohol, polyvinyl acetate and a mixture thereof, and most preferably, the polymer binder is polyacrylic acid or a salt or a derivative thereof.

[0168] The polymeric binder is contained in the coating layer of any aspect of the present invention in an amount of 5-25 wt%, preferably 10-20 wt% and more preferably 12-18 wt% based on the total dry weight of the coating layer.

[0169] The polymer binder is added to obtain a coating layer that is uniformly distributed on the substrate layer and adheres to the substrate layer. The amount of polymer binder added is selected to be high enough to allow the layer to have sufficient cohesion and adhesion, but low enough not to block or clog the pores of the surface-reacted calcium carbonate. To further improve adhesion, a primer layer may be provided between the substrate layer and the coating layer, as will be described below.

[0170] In addition, the adhesive allows the coating of any aspect of the present invention to be fixed to the substrate, for example by a coating process. Therefore, the adhesive is selected so that the coating does not delaminate during, for example, storage, loading of aqueous alkaline components and / or use of the sheet element or food packaging.

[0171] According to a particularly preferred embodiment, the polymer binder is selected from polyacrylic acid, its salts, its derivatives, starch, protein, polyvinyl alcohol, styrene-butadiene latex, styrene-acrylate, polyvinyl acetate, polyolefin, ethylene-acrylate, microfibrillated cellulose, microcrystalline cellulose, nanocellulose, cellulose, carboxymethyl cellulose, bio-based latex, or a mixture thereof, and more preferably, the polymer binder is selected from polyacrylic acid, its salts, its derivatives, starch, protein, styrene-butadiene latex, polyvinyl alcohol, polyvinyl acetate and a mixture thereof, and most preferably, the polymer binder is polyacrylic acid or a salt or a derivative thereof; and the polymer binder is contained in the coating layer of any aspect of the present invention in an amount of 5-25% by weight, preferably 10-20% by weight and more preferably 12-18% by weight based on the total dry weight of the coating layer.

[0172] Oxygen scavengers

[0173] The kit, the activated sheet-like element, the method, the supply device, the food packaging and the use according to the invention utilize an oxygen scavenger. The oxygen scavenger is a compound having at least one benzene ring with at least two phenolic hydroxyl groups and at least one group R.

[0174] wherein two of the at least two phenolic hydroxyl groups are arranged on the at least one phenyl ring in an ortho or para position relative to each other, and

[0175] wherein R is selected from hydrogen, hydroxy, alkoxy, aryloxy, amino, alkyl, aryl and -YR 1 Group.

[0176] -Y is selected from a direct bond, a linear or branched alkylene group having 1 to 6 carbon atoms and a -CH=CH- group, preferably, Y is a direct bond, and

[0177] -R 1 is an alkoxycarbonyl group, an aryloxycarboxyl group or a substantially completely deprotonated carboxyl group. 1 is a substantially completely deprotonated carboxyl group.

[0178] In a preferred embodiment, R is -YR as defined above 1 group.

[0179] The "phenolic hydroxyl group" refers to a hydroxyl group (-OH) directly bonded to an aromatic ring.

[0180] For the purposes of this invention, two substituents arranged in an "ortho" configuration on a benzene ring means that the two substituents are attached to the benzene ring in a 1,2 configuration relative to each other. Similarly, two substituents arranged in a "para" configuration on a benzene ring means that the two substituents are attached to the benzene ring in a 1,4 configuration. The relative position of the phenolic hydroxyl groups ensures that the oxygen scavenger is readily oxidized, thereby forming a quinoid system.

[0181] The -CH=CH- group may be in a cis or trans arrangement or a mixture thereof, and is preferably in a trans arrangement.

[0182] An amino group within the meaning of the present invention is a functional group -NH2, wherein optionally one or both of the hydrogen atoms are replaced by one or two organic radicals selected independently of one another.

[0183] Alkyl within the meaning of the present invention is a linear or branched saturated organic compound consisting of carbon and hydrogen having 1 to 28, preferably 8 to 26, more preferably 14 to 22 and most preferably 16 to 20 carbon atoms.

[0184] Aryl within the meaning of the present invention is a phenyl group, which is optionally further substituted by one or more organic groups and / or one or more functional groups.

[0185] An “organic radical” in the sense of the present invention is any organic substituent having one free valence at a carbon atom, regardless of the functional type, for example CH 3 CH 2 -, ClCH 2 -, CH 3 C(═O)-, 4-pyridylmethyl- (see IUPAC Gold Book, https: / / doi.org / 10.1351 / goldbook.O04329).

[0186] "Functional group" refers to any substituent other than hydrogen, halide or organic group, in particular hydroxyl, amino, thiol, organoxy, organothiol, phosphonate, phosphine and sulfonic acid groups.

[0187] "Alkoxycarbonyl" refers to the group -C(=O)-OR 2 , where R 2 represents an alkyl group, more preferably a methyl group, an ethyl group, a propyl group, a butyl group, a 2-ethylhexyl group, an octyl group or a dodecyl group.

[0188] "Aryloxycarbonyl" refers to the group -C(=O)-OR 3 , where R 3 represents an aryl group, preferably a phenyl group.

[0189] A "substantially fully deprotonated" carboxyl group refers to a group derived from a free carboxylic acid (-C(=O)-OH) in which the hydrogen atoms have been substantially completely replaced by a counterion, for example as a result of reaction with a base. The term "substantially fully substituted" or "substantially fully deprotonated" means that at least 50 mol%, preferably at least 80 mol%, more preferably at least 90 mol%, even more preferably at least 95 mol%, and most preferably at least 98 mol% of the hydrogen atoms of the carboxyl group are replaced by the counterion. This substantially fully deprotonated carboxyl group can be written as -C(=O)-O(H / M), where M represents the counterion.

[0190] The counterion is a cation, preferably selected from ammonium, sodium, lithium, potassium, cesium, magnesium, calcium and mixtures thereof, more preferably selected from sodium, potassium, calcium, magnesium and mixtures thereof, and most preferably a calcium cation.

[0191] For the purposes of the present invention, ammonium ions are selected from the group consisting of NH4 + , primary ammonium ions, secondary ammonium ions, tertiary ammonium ions and quaternary ammonium ions, preferably NH4 + .

[0192] In other words, the at least one oxygen scavenger of the present invention is a compound according to one of the following two formulae (1) and (2)

[0193] in

[0194] A1 、A 2 、A 3 and A 4 are independently selected from hydrogen, halide groups, organic groups and functional groups, and / or A 1 To A 4 Two adjacent residues of are connected to form an annelated ring, provided that A 1 To A 4 At least one of them is R as defined above.

[0195] Halide groups within the meaning of the present invention are fluoride, chloride, bromide and iodide.

[0196] A cyclic ring is understood to mean a new ring formed by two adjacent residues, which share two carbon atoms and one bond with the benzene ring shown in formula (1) or (2). Preferably, the two adjacent residues are selected from -CH=CH-CH=CH-, -C(=O)-O-CH2-CH2-, -C(=O)-O-CH=CH-, -C(=O)-CH2-CH(C6H5)-O- and -C(=O)-CH=C(C6H5)-O-.

[0197] Preferably, the at least one oxygen scavenger of the present invention is a compound according to formula (1) or (2), wherein A 1 、A 2 、A 3 and A 4 are independently selected from hydrogen, hydroxy, alkoxy and alkyl, provided that A 1 To A 4 At least one of them is R as defined above. The alkyl group is preferably a methyl group, and the alkoxy group is preferably a methoxy group.

[0198] In a preferred embodiment, the at least one oxygen scavenger is selected from phenolic acid derivatives with at least two phenolic hydroxyl groups arranged ortho or para relative to each other, cinnamic acid derivatives with at least two phenolic hydroxyl groups arranged ortho or para relative to each other, and mixtures thereof.

[0199] A "phenolic acid" within the meaning of the present invention is an aromatic compound comprising a carboxylic acid group and at least one phenolic hydroxyl group attached to an aromatic ring. A "cinnamic acid" within the meaning of the present invention includes the 3-phenylprop-2-enoic acid scaffold.

[0200] Thus, a "phenolic acid derivative carrying at least two phenolic hydroxyl groups arranged in ortho or para position relative to each other" is a compound having at least one benzene ring carrying at least two phenolic hydroxyl groups and at least one group R, wherein two of the at least two phenolic hydroxyl groups are arranged in ortho or para position relative to each other on the at least one benzene ring, and wherein R is -YR 1group, where Y is a direct bond and R 1 is an alkoxycarbonyl group, an aryloxycarboxyl group or a substantially completely deprotonated carboxyl group.

[0201] Similarly, a "cinnamic acid derivative having at least two phenolic hydroxyl groups arranged in ortho or para position relative to each other" is a compound having at least one benzene ring having at least two phenolic hydroxyl groups and at least one group R, wherein two of the at least two phenolic hydroxyl groups are arranged in ortho or para position relative to each other on the at least one benzene ring, and wherein R is -YR 1 group, wherein Y is a -CH=CH- group, and R 1 is an alkoxycarbonyl group, an aryloxycarboxyl group or a substantially completely deprotonated carboxyl group.

[0202] Therefore, in a particularly preferred embodiment, the at least one oxygen scavenger is selected from the group consisting of gallic acid (3,4,5-trihydroxybenzoic acid) derivatives, digallic acid (3,4-dihydroxy-5-[(3,4,5-trihydroxybenzoyl)oxy]benzoic acid) derivatives, protocatechuic acid (3,4-dihydroxybenzoic acid) derivatives, caffeic acid (3-(3,4-dihydroxyphenyl)-2-propenoic acid) derivatives, 5-hydroxyferulic acid (3-(3,4-dihydroxy-5-methoxyphenyl)prop-2-enoic acid) derivatives, gentisic acid ( benzoic acid) derivatives, chebulic acid ((2R)-2-[(3S)-3-carboxy-5,6,7-trihydroxy-1-oxo-3,4-dihydroisochromen-4-yl]butanedioic acid) derivatives, phloroglucinolcarboxylic acid (2,4,6-trihydroxybenzoic acid) derivatives, chicoric acid ((2R,3R)-2,3-bis{[(E)-3-(3,4-dihydroxyphenyl)prop-2-enoyl]oxy}butanedioic acid) derivatives, and mixtures thereof.

[0203] The term "acid derivative" in this context means that the at least one oxygen scavenger comprises an alkoxycarbonyl group, an aryloxycarboxyl group or a substantially completely deprotonated carboxyl group of the above-mentioned acid, i.e. the acid derivative is selected from the group consisting of an alkyl ester, an aryl ester and a substantially completely deprotonated acid of the corresponding acid.

[0204] More preferably, the at least one oxygen scavenger is a gallic acid derivative, preferably selected from substantially completely deprotonated gallic acid, ethyl gallate, propyl gallate, octyl gallate and dodecyl gallate, and most preferably substantially completely deprotonated gallic acid. Gallic acid derivatives are considered food safe and are approved in the European Union under E numbers E310 to E313.

[0205] Thus, in an exemplary embodiment of the present invention, the at least one oxygen scavenger is a substantially completely deprotonated gallic acid comprising a cation selected from the group consisting of ammonium, sodium, lithium, potassium, cesium, magnesium, calcium, and mixtures thereof, preferably selected from the group consisting of sodium, potassium, calcium, magnesium, and mixtures thereof, and most preferably a calcium cation.

[0206] basal layer

[0207] The inventive set, the inventive activated sheetlike element, the inventive method, the inventive supply device, the inventive food packaging and the inventive use utilize a substrate layer.

[0208] Coating of the present invention is fixed on the substrate, for example, carries out by applying step as described below.Coating of the present invention is fixed, so that this coating is for example not delamination during storage, loading aqueous alkaline component and / or using sheet element.Those skilled in the art know how to make given substrate compatible with coating of the present invention, for example, by selecting suitable polymer binder as above and / or by providing priming coat as described below to realize.Therefore, the present invention is not limited to any specific substrate.

[0209] The substrate layer comprises one or more individual substrate layers, that is, the substrate layer may have a single layer or multilayer structure. If the substrate layer comprises two or more individual substrate layers, these individual substrate layers may be made of the same or different materials. There is no restriction on the thickness of the substrate layer and / or individual substrate layers. For example, the substrate layer may have a thickness of 1 μm to 10 mm, preferably 10 μm to 1 mm, more preferably 20 μm to 0.5 mm, for example 50 to 150 μm. For example, the individual substrate layers may have a thickness of 1 μm to 10 mm, preferably 10 μm to 1 mm, more preferably 20 μm to 0.5 mm, for example 50 to 150 μm.

[0210] In a preferred embodiment of the present invention, the selected one or more individual substrate layers are selected from layers of polymeric materials. Suitable polymeric materials are those listed under Title 21 Part 177 of the Code of Federal Regulations (CFR).

[0211] Preferably, the polymer material layer is made of polyethylene, polypropylene, polyethylene terephthalate, polylactic acid, polyhydroxybutyrate, polyethylene-2,5-furan dicarboxylate, polystyrene; a fibrous material layer, more preferably made of viscose, cellulose acetate, polypropylene or polyethylene terephthalate; a paper layer; a cardboard layer; a textile layer; a nonwoven layer; a layer made of bio-based materials; a wood layer; a bamboo layer; a metal foil layer; an aluminum layer; a print receptive coating; and mixtures thereof. The one or more individual substrate layers are optionally subjected to a corona treatment.

[0212] In a particularly preferred embodiment of the present invention, the one or more individual substrate layers are layers of polymeric material. The polymeric material layer may be provided in the form of a sheet or a film. The polymer material layer can be made of any polymer material of natural or synthetic origin, and is preferably made of the following materials: polyethylene (such as linear low-density polyethylene, low-density polyethylene or high-density polyethylene), polypropylene, polycarbonate, polyvinylidene chloride, polymethyl methacrylate, biaxially oriented polypropylene, copolymers of ethylene and propylene, polystyrene, polyesters (such as polyethylene terephthalate, copolymers of ethylene terephthalate and ethylene isophthalate, polyethylene naphthalate, polylactic acid, polyhydroxybutyrate, polyethylene-2,5-furan dicarboxylate), biaxially oriented polyesters (such as biaxially oriented polyethylene terephthalate), polyvinyl chloride, cellulose acetate, cellophane or a mixture thereof, and more preferably, the polymer material layer is made of polyethylene, polypropylene, polyethylene terephthalate, polylactic acid, polyhydroxybutyrate, polyethylene-2,5-furan dicarboxylate, polystyrene or a mixture thereof.

[0213] The polymer material layer can be produced by any method known to those skilled in the art, for example by an extrusion process, a coextrusion process, a casting process, a calendering process, a solution deposition process or a skiving process. The substrate layer comprising two or more individual polymer material layers can be produced by a lamination process or an extrusion coating process. The substrate layer comprising at least one individual polymer material layer and at least one different individual substrate layer can be produced by a coating process or a lamination process, or, if the at least one different individual substrate layer is made of metal, can be produced by a vapor deposition process.

[0214] In another embodiment of the present invention, the one or more individual substrate layers are layers of fibrous material. The fibrous material layer can be a fabric layer, a textile layer, or a cloth layer, which is formed from filaments, yarns, threads, or staple fibers, such as by weaving, knitting, braiding, crocheting, knotting, or felting. For example, the individual substrate layers can be nonwoven layers. The production of nonwoven fabrics involves web forming steps, such as dry-laid, air-laid, wet-laid, spun-laid, melt-blown, and submicron spinning; and web bonding steps, such as calendering, air-through bonding, needle-punching, spunlace, stitch-bonding, and chemical bonding; and optional finishing treatments, such as embossing, stretching, perforating, crimping, or coating.

[0215] The fiber material layer can be made of any polymer material of natural or synthetic origin such as wool, linen, cotton, hemp, sisal, mineral fiber, viscose, cellulose acetate, polyethylene, polyacrylonitrile, polypropylene, polyester, polyethylene terephthalate, polylactic acid or a mixture thereof, and preferably, the fiber material layer is made of viscose, cellulose acetate, polypropylene, polyethylene terephthalate, polylactic acid or a mixture thereof.

[0216] In yet another embodiment of the present invention, the one or more individual substrate layers are paper or paperboard layers. The paper or paperboard layers comprise cellulosic fibers, such as those formed from wood pulp, and may further comprise additives, such as those listed under Title 21, Part 176 of the Code of Federal Regulations (CFR).

[0217] In another embodiment, the one or more individual substrate layers are layers made of bio-based materials. For the purposes of the present invention, the term "bio-based" material is defined in accordance with European Standard EN 16575:2014 and relates to materials derived from biomass, i.e., materials of biological origin, excluding materials embedded in geological formations and / or fossil materials. In the manufacture of bio-based materials, the biomass may have been subjected to physical, chemical, or biological treatments. Thus, suitable layers include layers of wood, bamboo, paper, cardboard, and layers made of biopolymers such as polylactic acid, polybutylene succinate, or polyhydroxybutyrate.

[0218] In yet another embodiment of the present invention, the one or more individual substrate layers are metal foil layers, such as tin layers or aluminum layers. The metal foil layers can be formed by hammer forging or rolling, or can be deposited on different individual substrate layers by metal vapor deposition.

[0219] In one embodiment of the present invention, the one or more single substrate layers are print receptive coating layers. The print receptive coating layer may comprise an inorganic pigment such as calcium carbonate or kaolin, and may comprise a binder, such as a polymer binder as described above. Optionally, the print receptive coating layer may comprise a cationic dye fixative, such as a water-soluble metal salt, preferably sodium chloride, aluminum sulfate, calcium chloride or magnesium chloride, or polydimethyldiallylammonium chloride. Therefore, the sheet element may be printed with a pattern, logo, text or other information, such as by offset printing or inkjet printing. Preferably, the ink receptive coating layer is positioned on the opposite side of the coating layer on the sheet element.

[0220] The base layer can be uniformly coated with the coating layer of the present invention. Consequently, optimal adhesion of the coating layer to the base layer can be achieved regardless of the material of the food packaging. The sheet element assembly thus obtained can be loaded with an aqueous alkaline component and, for example, loosely placed in a food packaging. Furthermore, the base layer allows for "additional functionality" of the sheet element, such as accommodating additional printed information, an adhesive layer for reversibly or irreversibly securing the sheet element within the food packaging, or a deterioration indicator label.

[0221] coating

[0222] The kit according to the invention, the activated sheetlike element according to the invention, the method according to the invention, the supply device according to the invention, the food packaging according to the invention and the use according to the invention utilize a coating layer.

[0223] The coating layer comprises a particulate filler in an amount of 25-70 wt % based on the total dry weight of the coating layer, a polymer binder in an amount of 5-25 wt % based on the total dry weight of the coating layer, and at least one oxygen scavenger in an amount of 25-70 wt % based on the total dry weight of the coating layer. The particulate filler comprises surface-reacted calcium carbonate in an amount of at least 50 wt % based on the total amount of the particulate filler, wherein the surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + The reaction product of the ion donor, wherein the carbon dioxide is passed through H3O + The ion donor is formed in situ and / or supplied from an external source, and wherein the surface-reacted calcium carbonate has a specific surface area measured by the BET method of 20-200 m 2 / g.

[0224] It is understood that the particulate filler, the surface-reacted calcium carbonate, the at least one oxygen scavenger and the polymeric binder are described above.

[0225] In a preferred embodiment, the coating layer comprises a polymer binder in an amount of 10-20 wt. % based on the total dry weight of the coating layer and / or a particulate filler in an amount of 30-60 wt. % based on the total dry weight of the coating layer and / or an oxygen scavenger in an amount of 30-60 wt. % based on the total dry weight of the coating layer.

[0226] Furthermore, the coating may comprise further additives such as rheology modifiers, viscosity enhancers, wetting agents, waxes, antistatic agents and / or defoamers. Suitable viscosity modifiers include thickeners.

[0227] In one embodiment of the present invention, the viscosity modifier is selected from starch, modified starch, maltodextrin, dextran, vegetable gum, pectin, protein (e.g., collagen, egg white, gelatin, casein, albumin), arrowroot, corn starch, kuzu starch, katakuri starch, potato starch, sago, wheat flour, almond flour, tapioca starch, konyak, aiyu ice, alginines (e.g., alginic acid, sodium alginate, potassium alginate, ammonium alginate, calcium alginate and propylene glycol alginate), guar gum, locust bean gum, oat gum, xanthan gum, acacia gum, karaya gum, Preferably, the viscosity improver is a compound approved for use in food by the Scientific Committee on Food and / or the European Food Safety Authority.

[0228] In a preferred embodiment of the present invention, the viscosity modifier is selected from the group consisting of guar gum, starch, cellulose, carboxymethyl cellulose, locust bean gum, xanthan gum, pectin, carrageenan, agar, salts thereof, derivatives thereof and mixtures thereof.

[0229] The coating layer may comprise the additional additive in an amount of 0.05-5.0 wt%, preferably 0.1-2.0 wt%, more preferably 0.2-1.0 wt%, based on the total dry weight of the coating layer.

[0230] In a preferred embodiment of the present invention, the coating layer comprises a dispersant.

[0231] In one embodiment of the invention, the dispersant is selected from homopolymers or copolymers of polycarboxylic acids and / or their salts and / or derivatives, based, for example, on acrylic acid, methacrylic acid, maleic acid, fumaric acid or itaconic acid, and acrylamide or mixtures thereof. Homopolymers or copolymers of acrylic acid and / or its salts and / or derivatives are particularly preferred. The molecular weight M of such products is w A molecular weight M of preferably 1000-15000 g / mol, particularly preferably 1500-6000 g / mol wThe molecular weight of the dispersants is selected so that they do not act as binders, but rather as separating compounds. The polymers and / or copolymers may be neutralized with monovalent and / or polyvalent cations, or they may have free acid groups. Suitable monovalent cations include, for example, sodium, lithium, potassium, or ammonium. Suitable polyvalent cations include, for example, calcium, magnesium, strontium, or aluminum. A combination of sodium and magnesium is particularly preferred.

[0232] In another embodiment of the present invention, the dispersant is selected from starch, carboxymethyl cellulose, glycols, polyglycols such as polyethylene glycol, ethylene oxide-propylene oxide-ethylene oxide block copolymers, sodium polyphosphate and / or polyaspartic acid and their alkali metal and / or alkaline earth metal salts, sodium citrate and amines, alkanolamines such as triethanolamine and triisopropanolamine, and mixtures thereof. Other monomeric or polymeric additives may also be used, alone or in combination, such as ethylene-acrylic acid copolymers. The ratio of acrylic acid monomer to ethylene monomer in the copolymer is preferably 1:4 to 1:50, particularly preferably 1:4 to 1:10, and in particular 1:5. Dispersants based on organometallic compounds may also be used. However, any other dispersant may also be used.

[0233] In a preferred embodiment of the present invention, the dispersant is selected from polyacrylic acid, its salts, derivatives thereof, starch, carboxymethyl cellulose or mixtures thereof having a molecular weight of 1000-15000 g / mol. More preferably, the dispersant is polyacrylic acid partially or completely neutralized with alkali metal ions such as lithium, sodium, potassium, cesium and mixtures thereof (preferably sodium) and having a molecular weight of 1500-6000 g / mol.

[0234] For the purposes of the present invention, the term "partially neutralized" means that at least 10 mol%, preferably at least 25 mol%, more preferably at least 50 mol% of the hydrogen atoms of the carboxyl groups of the polyacrylic acid are replaced by alkali metal ions. For the purposes of the present invention, the term "completely neutralized" means that at least 90 mol%, preferably at least 95 mol%, more preferably at least 98 mol%, and most preferably at least 99 mol% of the hydrogen atoms of the carboxyl groups of the polyacrylic acid are replaced by alkali metal ions.

[0235] Most preferably, the dispersant is polyacrylic acid partially or fully neutralized with sodium ions and having a molecular weight of 1500-6000 g / mol.

[0236] The coating layer may contain the dispersant in an amount of 0.1 to 10 wt%, preferably 0.5 to 7 wt%, more preferably 1.0 to 4 wt%, based on the total dry weight of the coating layer.

[0237] The dispersant may be included in the coating layer to improve uniform dispersion of the particulate filler comprising surface-reacted calcium carbonate throughout the coating layer and to reduce the amount of aggregates of the particulate filler comprising surface-reacted calcium carbonate. At the same time, the specified amount can largely help maintain the accessibility of the pores of the surface-reacted calcium carbonate to the oxygen scavenger and the aqueous alkaline component. In a preferred embodiment of the present invention, the dispersant is selected from polyacrylic acid having a molecular weight of 1000-15000 g / mol, its salts, derivatives thereof, starch, carboxymethyl cellulose or mixtures thereof, more preferably, the dispersant is polyacrylic acid partially or completely neutralized by alkali metal ions (preferably lithium, sodium, potassium and mixtures thereof) and having a molecular weight of 1500-6000 g / mol, most preferably, the dispersant is polyacrylic acid partially or completely neutralized by sodium ions and having a molecular weight of 1500-6000 g / mol, and the dispersant is contained in the coating layer of any aspect of the present invention in an amount of 0.1-10% by weight, preferably 0.5-7% by weight, more preferably 1.0-4% by weight, based on the total dry weight of the coating layer.

[0238] It is understood that the amount of the particulate filler, the binder, the at least one oxygen scavenger, the optional additional additives, and the optional dispersant totals 100 weight percent based on the total dry weight of the coating layer. Thus, in one embodiment, the coating layer does not contain additional additives, and the amount of the particulate filler, the binder, the at least one oxygen scavenger, and the optional dispersant totals 100 weight percent based on the total dry weight of the coating layer.

[0239] The coating layer is suitable for absorbing oxygen and absorbing alkaline components. Therefore, preferably, the coating layer has a high porosity in order to accommodate a sufficiently high amount of alkaline components. For the purposes of the present invention, the porosity of the coating layer is represented by the total intrusion specific pore volume measured by mercury intrusion porosimetry.

[0240] Therefore, the coating layer of the present invention has a total intrusion specific pore volume of 0.1-2 cm 3 In a preferred embodiment, the total intrusion specific pore volume measured by mercury intrusion porosimetry is 0.1-1.0 cm 3 / g, preferably 0.15-0.5cm 3 / g.

[0241] In a preferred embodiment, the coating has

[0242] - Total intra-particle intrusion specific pore volume of 0.05-1.0 cm as measured by mercury intrusion porosimetry 3 / g, preferably 0.08-0.5cm 3 / g and more preferably 0.1-0.4 cm 3 / g,

[0243] - Total interparticle intrusive specific pore volume of 0.05-0.5 cm-3 as measured by mercury intrusion porosimetry 3 / g, preferably 0.08-0.4cm 3 / g and more preferably 0.1-0.3 cm 3 / g,

[0244] - Total occluded intrusive specific pore volume of 0.05-0.4 cm-3 as measured by mercury intrusion porosimetry 3 / g, preferably 0.08-0.3cm 3 / g and more preferably 0.1-0.2cm 3 / g.

[0245] The total intrusion specific pore volume, the total interparticle intrusion specific pore volume and the total occluded intrusion specific pore volume are determined as described in CJ Ridgway, PAC Ganes in "On bulk density measurement and coating porosity calculation for coated paper samples" (Nordic Pulp and Paper Research Journal 2003, 18, 24-31). Briefly, the sample is coated onto an impermeable substrate such as aluminum foil or PET film and characterized using a Micromeritics Au-topore V mercury porosimeter in an equivalent Laplace diameter ranging from 208 μm to 0.004 μm. The specific pore volume is given relative to the weight of the coating (excluding the impermeable substrate).

[0246] The total pore volume seen in the cumulative intrusion data can be divided into two regions, with the intrusion data from 214 μm down to about 10 μm indicating a rolling process and that the interface between the coating and the foil results in some initial pore volume distribution over a large pore size range. Below these diameters is the fine interparticle pore volume of the coating. If the particles also have intraparticle pores, this region appears bimodal, and the specific intraparticle pore volume is defined by taking the specific pore volume of pores finer than the peak inflection point (i.e., finer than the bimodal inflection point) caused by mercury intrusion. The sum of these three regions gives the overall total pore volume of the coated sample.

[0247] By taking the first derivative of the cumulative intrusion curve, the pore size distribution based on the equivalent Laplace diameter is revealed, which necessarily includes pore shielding. The differential curve clearly shows the closed pore structure region, the interparticle pore region, and the intraparticle pore region (if present). Knowing the intraparticle pore diameter range, the remaining interparticle and closed pore volume can be subtracted from the total pore volume to give the desired pore volume of the individual internal pores in terms of pore volume per unit mass (specific pore volume). Of course, the same subtraction principle also applies to separating any other pore size regions of interest.

[0248] Coating of the present invention has high fluid acceptance. In a preferred embodiment, this coating has 1-50% by weight, more preferably 10-45% by weight, most preferably 15-35% by weight of fluid acceptance. Therefore, this coating can load a large amount of aqueous alkaline components and can not make coating delamination and can not make aqueous alkaline components leak.

[0249] The "fluid receptivity" of a coating is understood to be the amount of fluid (e.g., water) that the coating can absorb at room temperature without leaking the fluid or causing the coating to delaminate. The fluid receptivity is determined visually. The fluid receptivity is expressed in % by weight and refers to the weight of the fluid per unit weight of the coating. Preferably, the fluid is water or a 1M KCO aqueous solution.

[0250] The particulate filler comprising surface-reacted calcium carbonate is present in the coating layer to provide the coating layer with high porosity. It is believed that the intra-particle pores, inter-particle pores and coarse agglomerate pores of the particulate filler (particularly surface-reacted calcium carbonate) are partially filled with oxygen scavengers and partially retained in the coating layer, thereby allowing high absorption of the aqueous alkaline component.

[0251] The polymer binder is added in order to obtain a coating layer that is uniformly distributed on the substrate layer and adheres to the substrate layer. The amount of polymer binder added is selected to be high enough to allow the layer to have sufficient cohesion and adhesion, but low enough not to block or clog the pores of the surface-reacted calcium carbonate. In a preferred embodiment, the coating layer comprises polymer binder in an amount of 10% to 20% by weight, more preferably 12-18% by weight, based on the total dry weight of the coating layer.

[0252] Kits for improving the shelf life of food

[0253] According to a first aspect of the present invention, there is provided a kit for improving the shelf life of food, the kit comprising a sheet element assembly and an alkaline component.

[0254] Chip component assembly

[0255] The sheet-like element comprises a coating layer and a base layer. The base layer and the coating layer are described above.

[0256] This coating is deposited on this substrate, wherein this substrate is as described above.The present invention is not limited to any specific substrate.Those skilled in the art will regulate the composition of this coating to allow the effective adhesion of this coating and selected substrate.Depending on employed substrate, this sheet element can be flexible (that is, it can bend without the delamination of coating) or rigid.This substrate allows to obtain an evenly distributed coating.Therefore, no matter the material of food packaging, can realize the best adhesion of this coating and this substrate.In addition, this substrate allows " additional function " of this sheet element.

[0257] Preferably, the coating layer is 1-200 g / m 2 , preferably 2-150g / m 2 , more preferably 10-120g / m 2 , most preferably 25-100g / m 2 The coating layer can be applied to the substrate layer by the process described below, preferably by a roller coating step.

[0258] In another embodiment of the present invention, this sheet element also comprises one or more adhesive layers, this adhesive layer is positioned at this substrate on the opposite side of this coating and / or between single substrate layer, and wherein this adhesive layer is preferably selected from tackiness agent, sealant, rubber coating, pressure-sensitive layer and aforesaid mixture.If there is this adhesive layer, then this adhesive layer is used for temporarily or permanently fixing this sheet element on the inner surface of food package, perhaps is used for temporarily fixing this sheet element on the sheet element supply device, as described below.Yet, under the situation that there is no adhesive layer, this sheet element can simply be placed in the food package loosely.If this adhesive layer is present between single substrate layer, then this adhesive layer allows the adhesion of the improvement that realizes single substrate layer, thereby improves life-span and the durability of this sheet element.

[0259] Suitable materials for the adhesive layer are known to those skilled in the art and include those listed under 21 CFR 175.105. Specific examples include polyethylene imine, polyurethane, polyacrylate, and starch. Suitable materials for the pressure-sensitive layer include those listed under 21 CFR 175.125.

[0260] In another embodiment of the present invention, this sheet element also comprises one or more primers between this substrate and this coating.This primer can be selected from any suitable material well known by persons skilled in the art, and is preferably selected from polyurethane, ethylene-vinyl acetate, polyvinyl chloride, nitrocellulose, acrylate, ethylene-acrylate, polyacrylonitrile (acrylic acid system) and composition thereof.More preferably, this primer is formed by the aqueous dispersion that comprises acrylate, ethylene-acrylate, polyacrylonitrile, polyurethane and / or nitrocellulose.Optionally, this primer also comprises polysilicic acid.If this primer is present between this substrate and this coating, then this primer allows to improve the adhesion between single substrate and / or this substrate and this coating, thereby improves life-span and the durability of this sheet element.

[0261] In a preferred embodiment of the invention, the sheet-like element further comprises one or more oxygen-permeable covering layers to permanently cover the coating layer. The term "oxygen-permeable" covering layer within the meaning of the present invention refers to a covering layer which allows oxygen to pass through, for example due to the presence of micropores.

[0262] The oxygen permeable cover layer allows oxygen to penetrate substantially unimpeded from the atmosphere of the food to the coating layer, but prevents the coating layer and the food from coming into direct contact with each other. Therefore, preferably, the breathable cover layer is selected from a breathable film layer, a fiber material layer and a non-woven fabric layer. The breathable film layer can be made of a material such as polyethylene, polypropylene or polyethylene terephthalate. Suitable breathable film layers include those disclosed in WO 2016 / 023937A1. Suitable fiber material layers and non-woven fabric layers for use as breathable cover layers include those described above in the context of the substrate layer.

[0263] In a preferred embodiment, the oxygen-permeable cover layer also prevents the passage of moisture or water vapor, so that water added in the form of the aqueous alkaline component does not evaporate from the coating layer. As a result, the oxygen scavenging activity of the activated sheet element can be further improved in low humidity environments (e.g., below 50% rH). An exemplary oxygen-permeable but moisture-impermeable coating is an LDPE film. This layer is typically removed from the sheet element assembly for application of the aqueous alkaline component or added to the activated sheet element (i.e., after application of the aqueous alkaline component).

[0264] In another embodiment of the present invention, this sheet element also comprises one or more protective coats with this coating and / or this adhesive layer of temporary sealing, and wherein this protective coat is preferably selected from polyethylene, polypropylene and / or coated paper.This protective coat protects this coating from environmental influences, for example, avoids by dirt or grease pollution, is used until this sheet element assembly, promptly activated and is placed in food packaging by this alkaline component.If this sheet element has been loaded with alkaline component, then this protective coat is oxygen impermeable layer, and it prevents from reacting prematurely with oxygen before the intended use.Therefore, a requirement is that this protective coat can be removed from this coating when not damaging coating.Preferably, this protective coat is made up of any polymeric material such as polyethylene, polypropylene or polystyrene or coated paper.If there is a breathable cover in this sheet element, then this protective coat is placed on this breathable cover.

[0265] The sheet-like element may have a size that is adjusted to the specific needs of the application (e.g., the size of the food package and / or the type and amount of food in the package). The sheet-like element may, for example, be in the form of an angled or rounded patch or sheet. The coating area or size of the sheet-like element may be 3-200 cm 2 , preferably 4-150cm 2 , more preferably 5-100cm 2 The sheet-like element according to one embodiment may have a width of 3-8 or 5-10 cm 2 coating area or size.

[0266] In one embodiment of the present invention, two or more sheet elements as described above are combined to form a stack of sheet elements. It should be understood that the two or more sheet elements can be the same or different sheet elements. The two or more sheet elements are combined so that the coating layer of each individual sheet element is not blocked or is only slightly blocked. The term "slightly blocked" means that at most 25%, preferably at most 15%, and more preferably at most 10% of the coated area of ​​the sheet element is blocked or sealed. Therefore, preferably, the two or more sheet elements are combined using an intermittent adhesive layer, for example, by using glue dots, which are preferably placed between the two or more sheet elements so that at most 25%, preferably at most 15%, and more preferably at most 10% of the area of ​​the coating layer of the sheet element is blocked or sealed. Therefore, the size of the stacked sheet elements can be smaller than the total active oxygen scavenging area.

[0267] In another embodiment of the invention, one or more sheet elements as described above are combined with another functional coating. The one or more sheet elements are combined with the functional coating so that the coating layer of each individual sheet element and each functional coating is not blocked or only slightly blocked, for example by using an interrupted adhesive layer as defined above. The functional coating can be selected from a moisture control layer, a corrosion inhibition layer, a metal chelating layer, an antimicrobial active layer, a temperature monitoring layer, a radio frequency identification (RFID) layer, a security print layer and a metallized film layer, for example for microwave packaging.

[0268] The sheet element assembly can be manufactured using the process described below.

[0269] Alkaline components

[0270] The kit of the present invention further comprises an alkaline component. The alkaline component comprises a compound having a pK of 6 or less. b Value of base.

[0271] pK b A measure of the strength of a base and corresponds to the addition of a proton to the anion of the base, resulting in the base's corresponding acid. b The value can be calculated as follows: pK b =14-pK a Both values ​​can be gathered from standard textbooks and / or tables.

[0272] It should be understood that the alkaline component of the kit can consist of the base, or can comprise another component, such as a solvent, preferably water. An alkaline component comprising a base and water is referred to herein as an "aqueous alkaline component". In a preferred embodiment of the invention, the alkaline component is an aqueous alkaline component comprising a base and water.

[0273] The base activates the at least one oxygen scavenger by at least partially deprotonating at least two phenolic hydroxyl groups. Therefore, the base must be strong enough to at least partially deprotonate such phenolic hydroxyl groups. Without wishing to be bound by theory, it is believed that the resulting strongly electron-donating phenolate groups increase the electron density at the aromatic rings of the at least one oxygen scavenger, thereby enabling it to react with oxygen. The at least one activated oxygen scavenger can undergo various reactions with oxygen, resulting in the formation of several by-products, such as dimers, ring-opened compounds and quinones, as well as hydrogen peroxide. The reactions are mediated or facilitated by the presence of water. Therefore, one requirement is that the base is dissolved or suspended in water prior to activation.

[0274] Therefore, if the alkaline component of the kit of the present invention does not contain water, then the alkaline component is dissolved or suspended in water at the time of use to form an aqueous alkaline component. It is advantageous to dissolve or suspend the alkaline component in water only at the time of use because this minimizes storage and transportation costs and because it facilitates the handling of the alkaline component before use.

[0275] In a preferred embodiment, the base has a pK of 5 or less. b value, more preferably a pK value of 4 or lower b Most preferably, the base has a pK b In the range of 4 to 0.

[0276] The base may be selected from hydroxide bases, carbonate bases, ammonia bases and mixtures thereof, and is preferably selected from lithium hydroxide, sodium hydroxide, potassium hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, cesium carbonate and mixtures thereof, most preferably selected from sodium hydroxide, potassium carbonate and sodium carbonate.

[0277] For the purposes of this invention, a hydroxide base (pK b =0) are considered to be alkaline metal hydroxides, especially alkali metal hydroxides and alkaline earth metal hydroxides. Carbonate bases (pK b =3.6) are considered to be metal carbonates, in particular alkali metal carbonates and alkaline earth metal carbonates. Ammonia bases are understood to be bases containing nitrogen atoms, preferably ammonium hydroxide (or ammonia, pK b =4.75), primary amine, secondary amine or tertiary amine.

[0278] In one embodiment of the present invention, the alkaline component is an aqueous alkaline component. In another embodiment of the present invention, the alkaline component is dissolved or suspended in water to form an aqueous alkaline component prior to use.

[0279] Preferably, the pH of the aqueous alkaline component is at least 8, more preferably at least 10, even more preferably at least 11, and most preferably at least 12.

[0280] In another preferred embodiment, the aqueous alkaline component comprises the base in an amount of 1 wt% to 75 wt%, more preferably 5 wt% to 60 wt%, most preferably 10 wt% to 35 wt%, based on the total weight of the aqueous alkaline component.

[0281] In a preferred embodiment of the present invention, the kit for improving shelf life comprises

[0282] a) a chip component assembly having

[0283] a1) a coating layer comprising

[0284] i) a particulate filler in an amount of 25 to 70% by weight, based on the total dry weight of the coating layer,

[0285] wherein the particulate filler comprises surface-reacted calcium carbonate in an amount of at least 50% by weight, based on the total amount of the particulate filler,

[0286] The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + The reaction product of the ion donor, wherein the carbon dioxide is passed through H3O + The ion donor process is formed in situ and / or supplied from an external source, and

[0287] The surface-reacted calcium carbonate has a specific surface area of ​​20-200 m2 measured by the BET method. 2 / g,

[0288] ii) a polymeric binder in an amount of 5 to 25% by weight based on the total dry weight of the coating layer, and

[0289] iii) at least one oxygen scavenger in an amount of 25 to 70% by weight, based on the total dry weight of the coating layer,

[0290] wherein the at least one oxygen scavenger is selected from phenolic acid derivatives having at least two phenolic hydroxyl groups arranged in ortho or para position relative to each other, cinnamic acid derivatives having at least two phenolic hydroxyl groups arranged in ortho or para position relative to each other, and mixtures thereof,

[0291] wherein the acid derivative is selected from the group consisting of alkyl esters, aryl esters and substantially completely deprotonated acids of the corresponding acids, and

[0292] a2) basal layer, and

[0293] b) a basic component comprising a compound having a pK of 6 or less b The base is of a certain value and is selected from hydroxide bases, carbonate bases, ammonia bases and mixtures thereof, preferably an aqueous alkaline component.

[0294] In another preferred embodiment of the present invention, the kit for improving shelf life comprises:

[0295] a) a chip component assembly having

[0296] a1) a coating layer comprising

[0297] i) a particulate filler in an amount of 25 to 70% by weight, based on the total dry weight of the coating layer,

[0298] wherein the particulate filler comprises surface-reacted calcium carbonate in an amount of at least 70% by weight, based on the total amount of the particulate filler,

[0299] The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + The reaction product of the ion donor, wherein the carbon dioxide is passed through H3O +The ion donor process is formed in situ and / or supplied from an external source, and

[0300] The surface-reacted calcium carbonate has a specific surface area of ​​20-200 m2 measured by the BET method. 2 / g,

[0301] ii) a polymer binder in an amount of 5-25% by weight based on the total dry weight of the coating layer, wherein the polymer binder is selected from the group consisting of polyacrylic acid, salts thereof, derivatives thereof, starch, protein, styrene-butadiene latex, polyvinyl alcohol, polyvinyl acetate, and mixtures thereof, and

[0302] iii) at least one oxygen scavenger in an amount of 25 to 70% by weight, based on the total dry weight of the coating layer,

[0303] wherein the at least one oxygen scavenger is selected from the group consisting of gallic acid derivatives, digallic acid derivatives, protocatechuic acid derivatives, caffeic acid derivatives, 5-hydroxyferulic acid derivatives, gentisic acid derivatives, erotic acid derivatives, chebulic acid derivatives, phloroglucinolcarboxylic acid derivatives, chicoric acid derivatives, and mixtures thereof, even more preferably, the at least one oxygen scavenger is selected from the group consisting of gallic acid derivatives, wherein the acid derivative is selected from the group consisting of alkyl esters, aryl esters and substantially completely deprotonated acids of the corresponding acids, and

[0304] a2) basal layer, and

[0305] b) an alkaline component comprising a base selected from the group consisting of lithium hydroxide, sodium hydroxide, potassium hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, cesium carbonate and mixtures thereof, preferably an aqueous alkaline component.

[0306] In yet another preferred embodiment of the present invention, the kit for improving shelf life comprises:

[0307] a) a chip component assembly having

[0308] a1) a coating layer comprising

[0309] i) a particulate filler in an amount of 25 to 70% by weight, based on the total dry weight of the coating layer,

[0310] wherein the particulate filler comprises surface-reacted calcium carbonate in an amount of at least 90% by weight, based on the total amount of the particulate filler,

[0311] The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + The reaction product of the ion donor, wherein the carbon dioxide is passed through H3O + The ion donor process is formed in situ and / or supplied from an external source, and

[0312] The surface-reacted calcium carbonate has a specific surface area of ​​20-200 m2 measured by the BET method. 2 / g,

[0313] ii) a polymer binder in an amount of 5-25% by weight based on the total dry weight of the coating layer, wherein the polymer binder is selected from the group consisting of polyacrylic acid, salts thereof, derivatives thereof, starch, protein, styrene-butadiene latex, polyvinyl alcohol, polyvinyl acetate, and mixtures thereof, and

[0314] iii) at least one oxygen scavenger in an amount of 25 to 70% by weight, based on the total dry weight of the coating layer,

[0315] wherein the at least one oxygen scavenger is selected from the group consisting of gallic acid derivatives, digallic acid derivatives, protocatechuic acid derivatives, caffeic acid derivatives, 5-hydroxyferulic acid derivatives, gentisic acid derivatives, erotic acid derivatives, chebulic acid derivatives, phloroglucinolcarboxylic acid derivatives, chicoric acid derivatives, and mixtures thereof, even more preferably, the at least one oxygen scavenger is selected from the group consisting of gallic acid derivatives, wherein the acid derivative is a substantially completely deprotonated acid of the corresponding acid and comprises a cation selected from the group consisting of sodium, potassium, calcium, magnesium, and mixtures thereof, most preferably a calcium cation, and

[0316] a2) basal layer, and

[0317] b) an alkaline component comprising a base selected from the group consisting of lithium hydroxide, sodium hydroxide, potassium hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, cesium carbonate and mixtures thereof, preferably an aqueous alkaline component.

[0318] Activated sheet components

[0319] A second aspect of the present invention relates to an activated sheetlike element formed from the kit of the present invention by adding the alkaline component to the coating layer of the sheetlike element assembly, wherein the activated sheetlike element comprises the reaction product of the at least one oxygen scavenger and the base.

[0320] It will be appreciated that the kit, the sheet-like element assembly, the alkaline component, the base and the at least one oxygen scavenger are described in detail above.

[0321] The activated sheet-like element comprises the reaction product of the at least one oxygen scavenger and the base. The phenolic hydroxyl groups of the at least one oxygen scavenger are at least partially deprotonated, whereby the phenolic hydrogen atoms are replaced by cations of the base. The term "at least partially deprotonated" means that at least 2 mol %, preferably at least 5 mol %, more preferably at least 10 mol %, even more preferably at least 25 mol %, most preferably at least 50 mol % of all phenolic hydrogen atoms are replaced by cations of the base. For example, if the at least one oxygen scavenger comprises three phenolic hydroxyl groups, there are three phenolic hydrogen atoms. The cation corresponds to the cation of the base and is therefore preferably selected from alkali metal ions, alkaline earth metal ions and ammonium ions (i.e. NH + , primary, secondary or tertiary ammonium ion), more preferably selected from lithium, sodium, potassium and cesium, most preferably selected from potassium and sodium.

[0322] In a preferred embodiment, the basic component is added in an amount such that the base is added in an amount of at least 0.01 molar equivalents, preferably at least 0.02 molar equivalents, more preferably at least 0.05 molar equivalents, even more preferably at least 0.1 molar equivalents based on the molar amount of the oxygen scavenger.

[0323] The inventors have recognized that, in order to activate the at least one oxygen scavenger, a relatively small amount (ie a substoichiometric or catalytic amount) of base is sufficient. However, higher amounts of base may also be used.

[0324] In another preferred embodiment, the addition amount of the alkaline component is 10-70% by weight, preferably 20-65% by weight, more preferably 35-60% by weight based on the total weight of the coating layer. It should be understood that the term "total weight of the coating layer" refers to the coating layer comprising the alkaline component.

[0325] Additionally or alternatively, the basic component is added in an amount of 25-200 wt%, preferably 50-150 wt%, based on the total weight of the dry coating layer.

[0326] The alkaline component is preferably an aqueous alkaline component as defined above. Thus, the alkaline component used to form the activated sheet element contains a large amount of water, which helps to maintain the activity of the activated sheet element during storage. The amount of alkaline component is selected to be high enough so that the oxygen scavenger is activated, but delamination of the coating layer does not occur.

[0327] The present inventors have recognized that the coating of the present invention can retain a large amount of liquid, such as water or an aqueous alkaline component. Thus, the oxygen scavenging activity can be maintained for a long period of time, even at low relative humidity.

[0328] In other words, the activated sheetlike element of the present invention preferably comprises:

[0329] a1) a coating layer comprising

[0330] i) a particulate filler in an amount of 25 to 70% by weight, based on the total dry weight of the coating layer,

[0331] wherein the particulate filler comprises surface-reacted calcium carbonate in an amount of at least 50% by weight, based on the total amount of the particulate filler,

[0332] The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + The reaction product of the ion donor, wherein the carbon dioxide is passed through H3O + The ion donor process is formed in situ and / or supplied from an external source, and

[0333] The surface-reacted calcium carbonate has a specific surface area of ​​20-200 m2 measured by the BET method. 2 / g,

[0334] ii) a polymeric binder in an amount of 5 to 25% by weight based on the total dry weight of the coating layer, and

[0335] iii) at least one activated oxygen scavenger in an amount of 25 to 70% by weight, based on the total dry weight of the coating layer,

[0336] wherein the at least one activated oxygen scavenger is a compound having at least one benzene ring with at least two at least partially deprotonated phenolic hydroxyl groups and at least one group R, wherein two of the at least two phenolic hydroxyl groups are arranged on the at least one benzene ring in an ortho or para position relative to each other, and wherein R is selected from the group consisting of a hydrogen atom, a hydroxyl group, an alkoxy group, an aryloxy group, an amino group, an alkyl group, an aryl group, and -YR 1 group, preferably, wherein R is -YR 1 group, in which

[0337] -Y is selected from a direct bond, a linear or branched alkylene group having 1 to 6 carbon atoms and

[0338] -CH=CH- group, preferably, Y is a direct bond, and

[0339] -R 1 is an alkoxycarbonyl group, an aryloxycarboxyl group, or a substantially completely deprotonated carboxyl group, and

[0340] a2) basal layer.

[0341] wherein the coating, the particulate filler, the surface-reacted calcium carbonate, the polymeric binder, and the substrate layer are as described above. The at least one activated oxygen scavenger is a compound derived from the at least one oxygen scavenger described above by reacting the at least one oxygen scavenger with a base as described above. The activated sheet element may include the additional layers described above in the context of the sheet element assembly.

[0342] In a preferred embodiment, the activated sheet element has an oxygen scavenging rate (OSR) of 5-200 mL O2 / (dg OS ), preferably 10-150mL O2 / (dg OS ), more preferably 20-100 mL O2 / (dg OS ). OSR is given as mL of oxygen adsorbed per gram of oxygen scavenger per day. OSR is determined as follows: The activated sheet element is placed in a sealed tray containing 250 cm 3 The headspace of the tray was filled with a mixture of N2 and O2 (98:2 by volume) and the oxygen content in the headspace of the tray was measured until the oxygen content fell below 0.4% by volume. The amount of oxygen scavenged was divided by the time required to reduce the oxygen content to below 0.4% by volume and the amount of oxygen scavenger in the activated sheet element.

[0343] In another preferred embodiment, the activated sheet element has a concentration of 75-400 mL O2 / g OS The oxygen scavenging capacity (OSC) of the activated sheet is given as mL of oxygen adsorbed per gram of oxygen scavenger. The OSC is determined by placing the activated sheet element in a sealed tray containing 250 cm 3 A mixture of N2 and O2 (about 80:20 by volume) is added to the headspace of the tray and the oxygen content of the headspace is measured until the oxygen content is constant, for example, not varying by more than 0.1% by volume over the course of 6 hours. The amount of oxygen scavenged is divided by the amount of oxygen scavenger in the activated sheet element.

[0344] In a preferred embodiment of the present invention, the activated sheetlike element comprises:

[0345] a) a chip component assembly having

[0346] a1) a coating layer comprising

[0347] i) a particulate filler in an amount of 25 to 70% by weight, based on the total dry weight of the coating layer,

[0348] wherein the particulate filler comprises surface-reacted calcium carbonate in an amount of at least 50% by weight, based on the total amount of the particulate filler,

[0349] The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + The reaction product of the ion donor, wherein the carbon dioxide is passed through H3O + The ion donor process is formed in situ and / or supplied from an external source, and

[0350] The surface-reacted calcium carbonate has a specific surface area of ​​20-200 m2 measured by the BET method. 2 / g,

[0351] ii) a polymeric binder in an amount of 5 to 25% by weight based on the total dry weight of the coating layer, and

[0352] iii) at least one activated oxygen scavenger in an amount of 25 to 70% by weight, based on the total dry weight of the coating layer,

[0353] wherein the at least one oxygen scavenger is selected from phenolic acid derivatives having at least two at least partially deprotonated phenolic hydroxyl groups arranged in ortho or para position relative to each other, cinnamic acid derivatives having at least two phenolic hydroxyl groups arranged in ortho or para position relative to each other, and mixtures thereof,

[0354] wherein the acid derivative is selected from the group consisting of alkyl esters, aryl esters and substantially completely deprotonated acids of the corresponding acids, and

[0355] a2) basal layer, and

[0356] b) a basic component comprising a compound having a pK of 6 or less b The base is a base of a certain value and is selected from hydroxide bases, carbonate bases, ammonia bases and mixtures thereof.

[0357] In another preferred embodiment of the present invention, the activated sheet-like element comprises:

[0358] a) a chip component assembly having

[0359] a1) a coating layer comprising

[0360] i) a particulate filler in an amount of 25 to 70% by weight, based on the total dry weight of the coating layer,

[0361] wherein the particulate filler comprises surface-reacted calcium carbonate in an amount of at least 70% by weight, based on the total amount of the particulate filler,

[0362] The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + The reaction product of the ion donor, wherein the carbon dioxide is passed through H3O +The ion donor process is formed in situ and / or supplied from an external source, and

[0363] The surface-reacted calcium carbonate has a specific surface area of ​​20-200 m2 measured by the BET method. 2 / g,

[0364] ii) a polymer binder in an amount of 5-25% by weight based on the total dry weight of the coating layer, wherein the polymer binder is selected from the group consisting of polyacrylic acid, salts thereof, derivatives thereof, starch, protein, styrene-butadiene latex, polyvinyl alcohol, polyvinyl acetate, and mixtures thereof, and

[0365] iii) at least one activated oxygen scavenger in an amount of 25 to 70% by weight, based on the total dry weight of the coating layer,

[0366] wherein the at least one activated oxygen scavenger is selected from gallic acid derivatives, digallic acid derivatives, protocatechuic acid derivatives, caffeic acid derivatives, 5-hydroxyferulic acid derivatives, gentisic acid derivatives, erotic acid derivatives, chebulic acid derivatives, phloroglucinol carboxylic acid derivatives, chicoric acid derivatives, and mixtures thereof, and even more preferably, the at least one oxygen scavenger is selected from gallic acid derivatives,

[0367] wherein the acid derivative is selected from the group consisting of alkyl esters, aryl esters and substantially completely deprotonated acids of the corresponding acids,

[0368] wherein the phenolic hydroxyl group of the acid derivative is at least partially deprotonated, and

[0369] a2) basal layer, and

[0370] b) an alkaline component comprising a base selected from the group consisting of lithium hydroxide, sodium hydroxide, potassium hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, cesium carbonate, and mixtures thereof.

[0371] In yet another preferred embodiment of the present invention, the activated sheet-like element comprises:

[0372] a) a chip component assembly having

[0373] a1) a coating layer comprising

[0374] i) a particulate filler in an amount of 25 to 70% by weight, based on the total dry weight of the coating layer,

[0375] wherein the particulate filler comprises surface-reacted calcium carbonate in an amount of at least 90% by weight, based on the total amount of the particulate filler,

[0376] The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O +The reaction product of the ion donor, wherein the carbon dioxide is passed through H3O + The ion donor process is formed in situ and / or supplied from an external source, and

[0377] The surface-reacted calcium carbonate has a specific surface area of ​​20-200 m2 measured by the BET method. 2 / g,

[0378] ii) a polymer binder in an amount of 5-25% by weight based on the total dry weight of the coating layer, wherein the polymer binder is selected from the group consisting of polyacrylic acid, salts thereof, derivatives thereof, starch, protein, styrene-butadiene latex, polyvinyl alcohol, polyvinyl acetate, and mixtures thereof, and

[0379] iii) at least one activated oxygen scavenger in an amount of 25 to 70% by weight, based on the total dry weight of the coating layer,

[0380] wherein the at least one activated oxygen scavenger is selected from gallic acid derivatives, digallic acid derivatives, protocatechuic acid derivatives, caffeic acid derivatives, 5-hydroxyferulic acid derivatives, gentisic acid derivatives, erotic acid derivatives, chebulic acid derivatives, phloroglucinol carboxylic acid derivatives, chicoric acid derivatives, and mixtures thereof, and even more preferably, the at least one oxygen scavenger is selected from gallic acid derivatives,

[0381] wherein the acid derivative is a substantially completely deprotonated acid of the corresponding acid and comprises a cation selected from the group consisting of sodium, potassium, calcium, magnesium and mixtures thereof, most preferably a calcium cation,

[0382] wherein the phenolic hydroxyl group of the acid derivative is at least partially deprotonated, and

[0383] a2) basal layer, and

[0384] b) an alkaline component comprising a base selected from the group consisting of lithium hydroxide, sodium hydroxide, potassium hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, cesium carbonate, and mixtures thereof.

[0385] The activated sheetlike element can be produced in the process described below.

[0386] Method of the present invention

[0387] A third aspect of the present invention relates to a method for manufacturing a kit for improving the shelf life of food. The method comprises the following steps:

[0388] a) providing a particulate filler comprising surface-reacted calcium carbonate in an amount of at least 50% by weight, based on the total amount of the particulate filler,

[0389] The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + The reaction product of the ion donor, wherein the carbon dioxide is passed through H3O + The ion donor process is formed in situ and / or supplied from an external source, and

[0390] The surface-reacted calcium carbonate has a specific surface area of ​​20-200 m2 measured by the BET method. 2 / g, preferably 50-120m 2 / g,

[0391] b) providing at least one oxygen scavenger, the at least one oxygen scavenger being a compound having at least one benzene ring with at least two phenolic hydroxyl groups and at least one group R, wherein two of the at least two phenolic hydroxyl groups are located on the at least one benzene ring in an ortho or para position relative to each other, and wherein R is selected from the group consisting of a hydrogen atom, a hydroxyl group, an alkoxy group, an aryloxy group, an amino group, an alkyl group, an aryl group, and -YR 1 group, preferably, wherein R is -YR 1 group, in which

[0392] -Y is selected from a direct bond, a linear or branched alkylene group having 1 to 6 carbon atoms and

[0393] -CH=CH- group, preferably, Y is a direct bond, and

[0394] -R 1 is an alkoxycarbonyl group, an aryloxycarboxyl group or a substantially completely deprotonated carboxyl group,

[0395] c) providing a polymer binder,

[0396] d) providing a substrate layer comprising one or more individual substrate layers or a food packaging comprising the substrate layer,

[0397] e) mixing the oxygen scavenger of step b), the particulate filler of step a) and the polymeric binder of step c) in the order given therein to obtain a coating composition,

[0398] f) applying the coating composition of step e) to the substrate layer of step d) to obtain a sheet-like element precursor,

[0399] g) drying the sheet-like element precursor obtained in step f) to obtain a sheet-like element assembly,

[0400] h) providing a basic component comprising a compound having a pK of 6 or less b value of base, and optionally

[0401] i) mixing the alkaline component of step h) with water to obtain an aqueous alkaline component comprising the base and water, wherein preferably,

[0402] - the pH of the aqueous alkaline component is at least 8, more preferably at least 10, even more preferably at least 11, and most preferably at least 12, and / or

[0403] - the aqueous alkaline component comprises the base in an amount of 1 to 75 wt%, more preferably 5 to 60 wt% and most preferably 10 to 35 wt%, based on the total weight of the aqueous alkaline component.

[0404] In a fourth aspect of the present invention, a method for manufacturing a sheet element assembly is provided. The method comprises the following steps:

[0405] a) providing a particulate filler comprising surface-reacted calcium carbonate in an amount of at least 50% by weight, based on the total amount of the particulate filler,

[0406] The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + The reaction product of the ion donor, wherein the carbon dioxide is passed through H3O + The ion donor process is formed in situ and / or supplied from an external source, and

[0407] The surface-reacted calcium carbonate has a specific surface area of ​​20-200 m2 measured by the BET method. 2 / g, preferably 50-120m 2 / g,

[0408] b) providing at least one oxygen scavenger, the at least one oxygen scavenger being a compound having at least one benzene ring with at least two phenolic hydroxyl groups and at least one group R, wherein two of the at least two phenolic hydroxyl groups are located on the at least one benzene ring in an ortho or para position relative to each other, and wherein R is -YR 1 group, in which

[0409] -Y is selected from a direct bond, a linear or branched alkylene group having 1 to 6 carbon atoms and

[0410] -CH=CH- group, preferably, Y is a direct bond, and

[0411] -R 1 is a carboxyl group that is essentially completely deprotonated,

[0412] c) providing a polymer binder,

[0413] d) providing a substrate layer comprising one or more individual substrate layers or a food packaging comprising the substrate layer,

[0414] e) mixing the oxygen scavenger of step b), the particulate filler of step a) and the polymeric binder of step c) in the order given therein to obtain a coating composition,

[0415] f) applying the coating composition of step e) onto the substrate layer of step d) to obtain a sheet-like element precursor, and

[0416] g) drying the sheet-like element precursor obtained in step f) to obtain a sheet-like element assembly,

[0417] wherein step b) of providing the at least one oxygen scavenger comprises the following sub-steps:

[0418] b1) providing at least one oxygen scavenger precursor, which is a compound having at least one benzene ring with at least two phenolic hydroxyl groups and at least one group R, wherein two of the at least two phenolic hydroxyl groups are located on the at least one benzene ring in an ortho- or para-position relative to each other, and wherein R is -YR 1 group, in which

[0419] -Y is selected from a direct bond, a linear or branched alkylene group having 1 to 6 carbon atoms and

[0420] -CH=CH- group, preferably, Y is a direct bond, and

[0421] -R 1 It is a carboxyl group,

[0422] b2) providing a basic compound, and

[0423] b3) reacting the carboxyl group of the oxygen scavenger precursor of step b1) with the basic compound of step b2) to obtain the oxygen scavenger.

[0424] Steps a) to g) of both methods according to the invention are described below.

[0425] It should be understood that in step a) of the method of the present invention, a particulate filler as described above is provided. Furthermore, the at least one oxygen scavenger provided in step b) of the method of the present invention, the polymeric binder provided in step c) of the method of the present invention, and the base layer provided in step d) of the method of the present invention are as described above. The particulate filler of step a), the at least one oxygen scavenger of step b), and / or the polymeric binder of step c) may be provided independently of one another in pure form, or alternatively, in the form of a solution or suspension, wherein at least one of the particulate filler of step a), the at least one oxygen scavenger of step b), and / or the polymeric binder of step c) is provided in the form of a solution or suspension, or is dissolved or suspended in a solvent prior to the mixing step e).

[0426] In a preferred embodiment of the present invention, the polymer binder of step c) is provided in the form of a solution, more preferably an aqueous solution. In a particularly preferred embodiment of the present invention, the polymer binder of step c) is provided in the form of an aqueous solution having a pH of at least 7, preferably at least 8, for example, 8-12, for example, 8-10. The pH can be adjusted using any acid or base known to those skilled in the art. If the pH of the solution is initially below 7, it is preferably adjusted using an aqueous base solution such as sodium hydroxide solution. Adjusting the pH to a specific range can improve the swelling properties of the polymer binder.

[0427] In the mixing step e), the at least one oxygen scavenger of step b), the particulate filler of step a) and the polymeric binder of step c) are mixed in the stated order to obtain a coating composition.

[0428] Preferably, the coating composition thus obtained comprises the particulate filler in an amount of 25-70% by weight, preferably 30-60% by weight, more preferably 40-60% by weight, based on the total dry weight of the coating composition, the at least one oxygen scavenger in an amount of 25-70% by weight, preferably 30-60% by weight, more preferably 40-60% by weight, based on the total dry weight of the coating composition, and the binder in an amount of 5-25% by weight, preferably 10-20% by weight, more preferably 12-18% by weight, based on the total dry weight of the coating composition.

[0429] The coating composition obtained in step e) can, when temporarily stored, be stored under an inert gas atmosphere, for example under nitrogen, until its further processing or use.

[0430] It is understood that the amount of the particulate filler, the binder, the at least one oxygen scavenger, the optional additional additives, and the optional dispersant totals 100 weight percent based on the total dry weight of the coating layer. Thus, in one embodiment, the coating layer does not contain additional additives, and the amount of the particulate filler, the binder, the at least one oxygen scavenger, and the optional dispersant totals 100 weight percent based on the total dry weight of the coating layer.

[0431] Preferably, the mixing step e) is carried out in the presence of a solvent. Thus, the coating composition is obtained in the form of a slurry. The solvent can be any solvent that allows the granular filler containing surface-reacted calcium carbonate, the at least one oxygen scavenger and the polymeric binder to be dispersed in the coating composition, such as water, acetone, ethanol, methanol or butanone. In a particularly preferred embodiment, the solvent is water.

[0432] The solid content of the coating composition is preferably 10-80 wt%, more preferably 20-70 wt%, even more preferably 30-60 wt%, most preferably 40-55 wt%, based on the total weight of the coating composition.

[0433] During the mixing step e), additional additives such as rheology modifiers, viscosity enhancers, wetting agents, waxes, antistatic agents, dispersants, and / or defoamers may optionally be added. Suitable viscosity modifiers include thickeners, such as those described above. According to one embodiment, the additional additives may be added in an amount of 0.05-5.0% by weight, preferably 0.1-2.0% by weight, and more preferably 0.2-1.0% by weight, based on the total dry weight of the coating composition.

[0434] In a preferred embodiment of the present invention, the dispersant as described above is added during the mixing step e) in an amount of 0.1-10% by weight, preferably 0.5-7% by weight, more preferably 1-4% by weight, based on the total dry weight of the coating composition. In this embodiment, it is a requirement that the dispersant is added to the at least one oxygen scavenger of step b) before the addition of the particulate filler of step a).

[0435] Typically, the polymeric binder, the particulate filler and the at least one oxygen scavenger may be contacted by any conventional means known to those skilled in the art. For example, the compounds may be mixed in the absence or presence of a solvent. Suitable mixing apparatus are known to those skilled in the art and may include mixers or agitators, such as tumble mixers, vertical or horizontal ploughshare mixers, such as those available from Gebrüder. Maschinenbau GmbH acquired mixer, or a laboratory mixer, such as the MP mixer available from Somakon Verfahrenstechnik UG. A person skilled in the art will adjust the mixing conditions (such as the configuration of the mixing speed) according to his needs and the available equipment.

[0436] The inventors have found that the order of mixing ensures that the final coating layer obtained has a high porosity.The specified order also allows processing or mixing with high solid slurries, which is advantageous compared to low solid processes using large amounts of water or solvents.

[0437] In applying step f), the coating composition of step e) is applied to the substrate of step d) to form the sheet element precursor. Applying step f) can be carried out by any means known to those skilled in the art, for example, by spraying or coating. Preferably, applying step f) is carried out in the following manner: a coating step, more preferably roller coating, dip coating, rod coating (rodcoating), grooved rod coating, curtain coating, hard blade coating, coating roller coating, fountain coating (fountain coating), spray coating, short dwell coating (short dwell coating), slotted die coating, curved blade coating, bevel blade coating, air knife coating, bar coating (bar coating), gravure coating, traditional or metered size press coating, spray application technology, screen printing and / or wet stack coating (wet stack coating), and most preferably carried out by roller coating.

[0438] Preferably, the coating composition is applied at a coating weight sufficient to produce a final coating layer of 1-200 g / m 2 , preferably 2-150g / m 2 , more preferably 10-120g / m 2 And most preferably 25-100g / m 2 An amount of is applied to the base layer.

[0439] If the sheet-like element further comprises a primer layer, the primer layer is applied to the substrate layer of step d) in a primer step f1) prior to the application step f). The primer layer can be applied using any suitable application process known to those skilled in the art, either in an online process, i.e., at the same manufacturing process step or using the same equipment as the coating composition is applied in the application step f), or in an offline process, i.e., using separate equipment for the primer step f1) and the application step f).

[0440] The drying step g) can be carried out by any method known to those skilled in the art. Preferably, the drying step g) is carried out at a temperature of 50-150° C. at ambient pressure or under reduced pressure, preferably by hot air drying, IR radiation drying or UV radiation drying. The sheet-like element thus obtained comprises a coating layer preferably having a total intrusion specific pore volume of 0.25-2 cm 3 as measured by mercury intrusion porosimetry. 3 In a preferred embodiment, the total intrusion specific pore volume measured by mercury intrusion porosimetry is 0.1-1.5 cm 3 / g, more preferably 0.1-1.0cm 3 / g.

[0441] In a preferred embodiment, the coating has

[0442] - Total intra-particle intrusion specific pore volume of 0.05-1.0 cm as measured by mercury intrusion porosimetry 3 / g, preferably 0.08-0.5cm 3 / g and more preferably 0.1-0.4 cm 3 / g,

[0443] - Total interparticle intrusive specific pore volume of 0.05-0.5 cm-3 as measured by mercury intrusion porosimetry 3 / g, preferably 0.08-0.4cm 3 / g and more preferably 0.1-0.3 cm 3 / g, and / or

[0444] -Has a total occluded intrusive specific pore volume of 0.05-0.4 cm as measured by mercury intrusion porosimetry 3 / g, preferably 0.08-0.3cm 3 / g and more preferably 0.1-0.2cm 3 / g.

[0445] The method of the present invention for making a kit for improving the shelf life of food further comprises the step h) of providing an alkaline component comprising a hydroxyl radical having a pK of 6 or less. b In said step, a basic component as described above is provided.

[0446] Preferably, the method of the present invention for producing a kit for improving the shelf life of food further comprises the step i) of mixing the alkaline component of step h) with water to obtain an aqueous alkaline component comprising the base and water, wherein preferably

[0447] - the pH of the aqueous alkaline component is at least 8, more preferably at least 10, even more preferably at least 11, most preferably at least 12, and / or

[0448] - the aqueous alkaline component comprises the base in an amount of 1 to 75 wt%, more preferably 5 to 60 wt%, most preferably 10-35 wt%, based on the total weight of the aqueous alkaline component.

[0449] It will be appreciated that the aqueous alkaline component thus obtained is as described above.Step i) may be carried out by any mixing means known to those skilled in the art, such as those described above for process step e).

[0450] Method step b) of the method of the present invention may comprise the following sub-steps:

[0451] b1) providing at least one oxygen scavenger precursor, which is a compound having at least one benzene ring with at least two phenolic hydroxyl groups and at least one group R, wherein two of the at least two phenolic hydroxyl groups are located on the at least one benzene ring in an ortho- or para-position relative to each other, and wherein R is -YR 1 group, in which

[0452] -Y is selected from a direct bond, a linear or branched alkylene group having 1 to 6 carbon atoms and a -CH=CH- group, preferably, Y is a direct bond, and

[0453] -R 1 It is a carboxyl group,

[0454] b2) providing a basic compound, and

[0455] b3) reacting the carboxyl group of the oxygen scavenger precursor of step b1) with the basic compound of step b2) to obtain the oxygen scavenger.

[0456] Said sub-steps b1) to b3) are essential to the method for producing a sheet-like element assembly according to the fourth aspect of the invention and can be used to provide the oxygen scavenger of step b) of the method for producing a kit for improving the shelf life according to the third aspect of the invention.

[0457] The present inventors surprisingly discovered that oxygen scavengers containing free carboxylic acids can react with the surface-reacted calcium carbonate, potentially damaging its structure and ultimately resulting in a coating layer with low porosity. Such coating layers cannot accommodate suitably high amounts of aqueous alkaline components and, therefore, cannot be used as oxygen scavenging elements. Therefore, oxygen scavenger precursors containing free carboxylic acids must be substantially completely deprotonated by reaction with an alkaline compound before they are incorporated into the coating layer of the sheet element assembly of the present invention.

[0458] The alkaline compound can be any compound that is sufficiently alkaline to substantially completely deprotonate the carboxyl group of the oxygen scavenger precursor. Preferably, the alkaline compound is selected so that the reaction byproducts are water and optionally gas. Therefore, preferred alkaline compounds include carbonate bases, hydroxide bases, bicarbonate bases, amine bases, and mixtures thereof. More preferably, the alkaline compound is selected from sodium carbonate, sodium bicarbonate, sodium hydroxide, potassium carbonate, potassium bicarbonate, potassium hydroxide, calcium carbonate, calcium bicarbonate, calcium hydroxide, magnesium carbonate, magnesium bicarbonate, magnesium hydroxide, ammonia, and mixtures thereof, and most preferably calcium carbonate.

[0459] It should be understood that the calcium carbonate is preferably not surface-treated calcium carbonate, ie does not comprise a hydrophobicizing layer on its surface and / or does not have a significant amount of grinding aid attached thereto.

[0460] During step b3), the basic compound is preferably added to the oxygen scavenger precursor in a molar amount of 50% to 110%, preferably 80% to 100%, more preferably 90% to 100%, even more preferably 95% to 100%, still more preferably 98% to 100%, and most preferably 98% to 100%, relative to the oxygen scavenger precursor. Step b3) is preferably carried out in a solvent, more preferably in water. Step b3) can be carried out with mixing as described above under step e).

[0461] In a preferred embodiment of the present invention, the method for producing a sheet element assembly comprises the following steps:

[0462] a) providing a particulate filler comprising surface-reacted calcium carbonate in an amount of at least 50% by weight, based on the total amount of the particulate filler,

[0463] The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + The reaction product of the ion donor, wherein the carbon dioxide is passed through H3O + The ion donor process is formed in situ and / or supplied from an external source, and

[0464] The surface-reacted calcium carbonate has a specific surface area of ​​20-200 m2 measured by the BET method. 2 / g, preferably 50-120m 2 / g,

[0465] b) providing at least one oxygen scavenger selected from phenolic acid derivatives having at least two phenolic hydroxyl groups arranged in ortho or para position relative to each other, cinnamic acid derivatives having at least two phenolic hydroxyl groups arranged in ortho or para position relative to each other, and mixtures thereof, wherein the acid derivative is a substantially completely deprotonated acid of the corresponding acid,

[0466] c) providing a polymer binder,

[0467] d) providing a substrate layer comprising one or more individual substrate layers or a food packaging comprising the substrate layer,

[0468] e) mixing the oxygen scavenger of step b), the particulate filler of step a) and the polymeric binder of step c) in the order given therein to obtain a coating composition,

[0469] f) applying the coating composition of step e) onto the substrate layer of step d) to obtain a sheet-like element precursor, and

[0470] g) drying the sheet-like element precursor obtained in step f) to obtain a sheet-like element assembly,

[0471] wherein step b) of providing the at least one oxygen scavenger comprises the following sub-steps:

[0472] b1) providing at least one oxygen scavenger precursor selected from phenolic acids having at least two phenolic hydroxyl groups arranged in ortho or para position relative to each other, cinnamic acid having at least two phenolic hydroxyl groups arranged in ortho or para position relative to each other, and mixtures thereof,

[0473] b2) providing a basic compound, and

[0474] b3) reacting the carboxyl group of the oxygen scavenger precursor of step b1) with the basic compound of step b2) to obtain the oxygen scavenger.

[0475] In another preferred embodiment of the present invention, the method for producing a sheet-like element assembly comprises the following steps:

[0476] a) providing a particulate filler comprising surface-reacted calcium carbonate in an amount of at least 70% by weight, based on the total amount of the particulate filler,

[0477] The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + The reaction product of the ion donor, wherein the carbon dioxide is passed through H3O + The ion donor process is formed in situ and / or supplied from an external source, and

[0478] The surface-reacted calcium carbonate has a specific surface area of ​​20-200 m2 measured by the BET method. 2 / g, preferably 50-120m 2 / g,

[0479] b) providing at least one oxygen scavenger selected from the group consisting of gallic acid derivatives, digallic acid derivatives, protocatechuic acid derivatives, caffeic acid derivatives, 5-hydroxyferulic acid derivatives, gentisic acid derivatives, erotic acid derivatives, chebulic acid derivatives, phloroglucinolcarboxylic acid derivatives, chicoric acid derivatives, and mixtures thereof, even more preferably, the at least one oxygen scavenger is a gallic acid derivative, wherein the acid derivative is a substantially completely deprotonated acid of the corresponding acid,

[0480] c) providing a polymer binder,

[0481] d) providing a substrate layer comprising one or more individual substrate layers or a food packaging comprising the substrate layer,

[0482] e) mixing the oxygen scavenger of step b), the particulate filler of step a) and the polymeric binder of step c) in the order given therein to obtain a coating composition,

[0483] f) applying the coating composition of step e) onto the substrate layer of step d) to obtain a sheet-like element precursor, and

[0484] g) drying the sheet-like element precursor obtained in step f) to obtain a sheet-like element assembly,

[0485] wherein step b) of providing the at least one oxygen scavenger comprises the following sub-steps:

[0486] b1) providing at least one oxygen scavenger precursor selected from gallic acid, digallic acid, protocatechuic acid, caffeic acid, 5-hydroxyferulic acid, gentisic acid, erotic acid, chebulic acid, phloroglucinol carboxylic acid, chicoric acid, and mixtures thereof, even more preferably, the at least one oxygen scavenger is gallic acid,

[0487] b2) providing a basic compound selected from the group consisting of carbonate bases, hydroxide bases, bicarbonate bases, amine bases, and mixtures thereof, and preferably selected from the group consisting of sodium carbonate, sodium bicarbonate, sodium hydroxide, potassium carbonate, potassium bicarbonate, potassium hydroxide, calcium carbonate, calcium bicarbonate, calcium hydroxide, magnesium carbonate, magnesium bicarbonate, magnesium hydroxide, ammonia, and mixtures thereof, and most preferably calcium carbonate, and

[0488] b3) reacting the carboxyl group of the oxygen scavenger precursor of step b1) with the basic compound of step b2) to obtain the oxygen scavenger.

[0489] A fifth aspect of the present invention relates to a method for activating an assembly of sheet-like elements of the present invention in a set according to the present invention. The method comprises the following steps:

[0490] j) mixing the alkaline component with water to obtain an aqueous alkaline component comprising the base and water, and

[0491] k) applying the aqueous alkaline component to at least a portion of the surface of the coating layer.

[0492] It should be understood that the sheet element assembly of the present invention is as described above and can be obtained by any of the methods described herein. In addition, the kit, the alkaline component, the aqueous alkaline component, the base and the coating are as described above. The method results in an activated sheet element, preferably as described above.

[0493] Preferably, the basic component is added or applied in an amount such that the base is added in an amount of at least 0.01 molar equivalents, preferably at least 0.02 molar equivalents, more preferably at least 0.05 molar equivalents, even more preferably at least 0.1 molar equivalents, based on the molar amount of the oxygen scavenger, and / or the basic component is added in an amount of 10-70% by weight, preferably 20-65% by weight, more preferably 35-60% by weight, based on the total weight of the coating layer.

[0494] Apply step k) can be carried out by any measure well known to those skilled in the art on at least a portion of the surface of this coating, preferably by inkjet printing, spraying, coating, vapor deposition and / or dripping.In one embodiment, apply step k) and carry out by coating.Should be appreciated that this aqueous alkaline component can be applied by any coating mode well known to those skilled in the art, include but not limited to roller coating, dip coating, rod coating, grooved rod coating, curtain coating, hard blade coating, coating roller coating, fountain coating, spray coating, short stay coating, slotted die coating, curved blade coating, bevel blade coating, air knife coating, scraper bar coating, gravure coating, tradition or metering size press coating, spraying application technology, spin coating, screen printing and / or wet overcoating, preferably dip coating, slotted die coating and / or spin coating.

[0495] In a preferred embodiment, applying step k) is performed by inkjet printing, spraying, coating and / or dripping.In a particularly preferred embodiment, applying step k) is performed by spraying.

[0496] The application step k) can be carried out directly after the production of the sheet element (i.e. already at the manufacturing site). In this case, it is preferred to apply an oxygen-impermeable protective layer as described above to the activated sheet element, or to store the activated sheet element in a supply device as described below to prevent the scavenging of oxygen before the activated sheet element is incorporated into the food packaging.

[0497] However, it is particularly preferred that step k) of applying is carried out immediately or shortly before the activated sheetlike element is placed in the food packaging. Premature oxygen removal can thus be effectively avoided. In other words, the sheetlike element and the package are preferably transported and stored in an inactivated state.

[0498] Optionally, the method of the present invention further comprises a printing step 1). The sheet-like element may be printed with a pattern, logo, text or other information. Printing ink may be applied to the coating of the present invention and / or to the substrate on the opposite side of the coating of the present invention. In the latter alternative, preferably, the outermost single substrate is a print-receptive coating as described above. Suitable printing methods for the present invention include inkjet printing, offset printing, flexographic printing and gravure printing.

[0499] Optionally, the method of the present invention further comprises a cutting step m). The sheet-like element can be cut into a plurality of pieces having a predetermined size. The size of the piece is adjusted according to the specific needs of the application, such as the size of the food packaging or the type of food. The coating area or size of the piece can be 3-200 cm 2 , preferably 4-150cm 2 , more preferably 5-100cm 2The sheet-like element according to one embodiment may have a width of 3-8 or 5-10 cm 2 coating area or size.

[0500] Supply device of the present invention

[0501] The kit of the present invention may also include a supply device comprising the sheet element assembly of the present invention, wherein the supply device preferably comprises a roller or a magazine. Additionally, a sixth aspect of the present invention relates to a supply device comprising the activated sheet elements of the present invention, wherein the supply device protects the activated sheet elements from the effects of oxygen and preferably comprises a roller, a stack, a magazine or a package, such as a box.

[0502] The supply device comprises a sheet element assembly or an activated sheet element according to any of the aforementioned aspects of the present invention. Preferably, the supply device comprises a roller or a magazine containing the sheet element. The supply device may be a label dispenser or label applicator comprising the roller and / or magazine. However, the supply device may also be a sheet comprising at least two sheet elements according to the present invention. Therefore, preferably, the sheet element can be reversibly and non-destructively removed from the supply device.

[0503] Therefore, the sheet-like element can be easily distributed and provided at the time of use.

[0504] Food packaging of the present invention

[0505] The kit of parts of the present invention may further comprise a food packaging comprising the sheet-like element assembly, wherein the coating layer is present within the food packaging. Additionally, a seventh aspect of the present invention relates to a food packaging comprising the activated sheet-like element of the present invention, wherein the coating layer is present within the food packaging. It is understood that the sheet-like element and the coating layer are as defined above.

[0506] The aqueous alkaline composition is applied to the sheet element or coating in the food package of the present invention before, during or after the food is packaged in the food package of the present invention. The activated sheet element is placed in the food package before, during or after the food is packaged in the food package.

[0507] In a preferred embodiment, the food packaging comprising the activated sheet element of the present invention also comprises a modified atmosphere. The modified atmosphere packaging (MAP) of food is well known to those skilled in the art. The atmosphere in the food packaging initially comprises a reduced level of oxygen, i.e. less than 20% volume, more preferably less than 5% volume, most preferably less than 2% volume based on the total volume of the packaging atmosphere, which can be further reduced by the oxygen scavenging activity of the activated sheet element of the present invention. The modified atmosphere is preferably essentially composed of nitrogen and carbon dioxide, preferably in a volume ratio of 10:90-90:10, more preferably 20:80-80:20, most preferably 30:70-70:30, for example, about 70:30 or about 60:40 or about 50:50. It should be understood that the food packaging of the present invention is closed or sealed after the food packaging is filled with the activated sheet element, food and optional modified atmosphere. The food packaging can be closed or sealed by any means known to those skilled in the art.

[0508] Alternatively or additionally, the atmosphere of the food packaging comprises a relative humidity in the range of greater than 0 to 100% rH. The activated sheetlike element of the invention effectively scavenges oxygen at a relative humidity of 30-100% rH, preferably 50-100% rH.

[0509] In a preferred embodiment of the present invention, the food package is preferably sealed by heat sealing, pressure sealing and / or ultrasonic welding, more preferably in combination with a sealant. Preferred sealants for use in the present invention include pressure sensitive adhesives selected from the group consisting of permanent pressure sensitive adhesives, removable pressure sensitive adhesives and resealable pressure sensitive adhesives, preferably resealable pressure sensitive adhesives.

[0510] Within the food packaging of the present invention, the activated sheetlike element scavenge oxygen and thereby prevent or delay food spoilage and / or increase the shelf life of the food.

[0511] The present invention is not limited to any particular type of food. In one embodiment of the present invention, the food is selected from liquid and solid foods, including raw and processed meats, such as poultry, beef, pork, ham, sausage; dried meats; raw and processed fish; dairy products, such as cheese, such as sliced ​​or grated cheese; baked products, such as bread, toast, cakes, cookies; snacks; nuts and oilseeds; vegetables; confectionery, ready-to-eat foods, beverages, such as fruit or vegetable juices, especially orange juice, and the like.

[0512] The present inventors have discovered that the combined use of the activated sheetlike elements of the present invention and MAP has a synergistic effect on increasing the shelf life of food products. Most importantly, it has surprisingly been found that the activated sheetlike elements of the present invention retain their oxygen scavenging activity in the presence of CO2, whereas CO2 tends to deactivate the oxygen scavengers used in the present invention if not in the form of the sheetlike elements of the present invention.

[0513] In a preferred embodiment of the present invention, the food packaging of the present invention is a set comprising

[0514] a) a chip component assembly having

[0515] a1) a coating layer present in the food packaging, the coating layer comprising

[0516] i) a particulate filler in an amount of 25 to 70% by weight, based on the total dry weight of the coating layer,

[0517] wherein the particulate filler comprises surface-reacted calcium carbonate in an amount of at least 50% by weight, based on the total amount of the particulate filler,

[0518] The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + The reaction product of the ion donor, wherein the carbon dioxide is passed through H3O + The ion donor process is formed in situ and / or supplied from an external source, and

[0519] The surface-reacted calcium carbonate has a specific surface area of ​​20-200 m2 measured by the BET method. 2 / g,

[0520] ii) a polymeric binder in an amount of 5 to 25% by weight based on the total dry weight of the coating layer, and

[0521] iii) at least one oxygen scavenger in an amount of 25 to 70% by weight, based on the total dry weight of the coating layer,

[0522] wherein the at least one oxygen scavenger is selected from phenolic acid derivatives having at least two phenolic hydroxyl groups arranged in ortho or para position relative to each other, cinnamic acid derivatives having at least two phenolic hydroxyl groups arranged in ortho or para position relative to each other, and mixtures thereof,

[0523] wherein the acid derivative is selected from the group consisting of alkyl esters, aryl esters and substantially completely deprotonated acids of the corresponding acids, and

[0524] a2) basal layer, and

[0525] b) a basic component comprising a compound having a pK of 6 or less b The base is of a certain value and is selected from hydroxide bases, carbonate bases, ammonia bases and mixtures thereof, preferably an aqueous alkaline component.

[0526] In another preferred embodiment of the present invention, the food packaging of the present invention is a set comprising:

[0527] a) a chip component assembly having

[0528] a1) a coating layer present in the food packaging, the coating layer comprising

[0529] i) a particulate filler in an amount of 25 to 70% by weight, based on the total dry weight of the coating layer,

[0530] wherein the particulate filler comprises surface-reacted calcium carbonate in an amount of at least 70% by weight, based on the total amount of the particulate filler,

[0531] The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + The reaction product of the ion donor, wherein the carbon dioxide is passed through H3O + The ion donor process is formed in situ and / or supplied from an external source, and

[0532] The surface-reacted calcium carbonate has a specific surface area of ​​20-200 m2 measured by the BET method. 2 / g,

[0533] ii) a polymer binder in an amount of 5-25% by weight based on the total dry weight of the coating layer, wherein the polymer binder is selected from the group consisting of polyacrylic acid, salts thereof, derivatives thereof, starch, protein, styrene-butadiene latex, polyvinyl alcohol, polyvinyl acetate, and mixtures thereof, and

[0534] iii) at least one oxygen scavenger in an amount of 25 to 70% by weight, based on the total dry weight of the coating layer,

[0535] wherein the at least one oxygen scavenger is selected from the group consisting of gallic acid derivatives, digallic acid derivatives, protocatechuic acid derivatives, caffeic acid derivatives, 5-hydroxyferulic acid derivatives, gentisic acid derivatives, erotic acid derivatives, chebulic acid derivatives, phloroglucinolcarboxylic acid derivatives, chicoric acid derivatives, and mixtures thereof, even more preferably, the at least one oxygen scavenger is selected from the group consisting of gallic acid derivatives, wherein the acid derivative is selected from the group consisting of alkyl esters, aryl esters and substantially completely deprotonated acids of the corresponding acids, and

[0536] a2) basal layer, and

[0537] b) an alkaline component comprising a base selected from the group consisting of lithium hydroxide, sodium hydroxide, potassium hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, cesium carbonate and mixtures thereof, preferably an aqueous alkaline component.

[0538] In yet another preferred embodiment of the present invention, the food package of the present invention is a set comprising:

[0539] a) a chip component assembly having

[0540] a1) a coating layer present in the food packaging, the coating layer comprising

[0541] i) a particulate filler in an amount of 25 to 70% by weight, based on the total dry weight of the coating layer,

[0542] wherein the particulate filler comprises surface-reacted calcium carbonate in an amount of at least 90% by weight, based on the total amount of the particulate filler,

[0543] The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + The reaction product of the ion donor, wherein the carbon dioxide is passed through H3O + The ion donor process is formed in situ and / or supplied from an external source, and

[0544] The surface-reacted calcium carbonate has a specific surface area of ​​20-200 m2 measured by the BET method. 2 / g,

[0545] ii) a polymer binder in an amount of 5-25% by weight based on the total dry weight of the coating layer, wherein the polymer binder is selected from the group consisting of polyacrylic acid, salts thereof, derivatives thereof, starch, protein, styrene-butadiene latex, polyvinyl alcohol, polyvinyl acetate, and mixtures thereof, and

[0546] iii) at least one oxygen scavenger in an amount of 25 to 70% by weight, based on the total dry weight of the coating layer,

[0547] wherein the at least one oxygen scavenger is selected from the group consisting of gallic acid derivatives, digallic acid derivatives, protocatechuic acid derivatives, caffeic acid derivatives, 5-hydroxyferulic acid derivatives, gentisic acid derivatives, erotic acid derivatives, chebulic acid derivatives, phloroglucinolcarboxylic acid derivatives, chicoric acid derivatives, and mixtures thereof, even more preferably, the at least one oxygen scavenger is selected from the group consisting of gallic acid derivatives, wherein the acid derivative is a substantially completely deprotonated acid of the corresponding acid and comprises a cation selected from the group consisting of sodium, potassium, calcium, magnesium, and mixtures thereof, most preferably a calcium cation, and

[0548] a2) basal layer, and

[0549] b) an alkaline component comprising a base selected from the group consisting of lithium hydroxide, sodium hydroxide, potassium hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, cesium carbonate and mixtures thereof, preferably an aqueous alkaline component.

[0550] Uses of the present invention

[0551] An eighth aspect of the present invention relates to the use of the kit of the present invention and / or the activated sheetlike element of the present invention in food packaging.A ninth aspect of the present invention relates to the use of the kit of the present invention or the activated sheetlike element of the present invention for extending the shelf life of food.

[0552] It will be appreciated that the kit, the activated sheetlike element and the food packaging are as described above.

[0553] As described above in detail, the activated sheetlike element of the present invention loaded with the alkaline component effectively and rapidly scavenges oxygen from the headspace atmosphere of food packaging. The presence of oxygen can be associated with an increased growth of pathogenic microorganisms, in particular bacteria, fungi and molds, such as Campylobacter jejuni, Escherichia coli, Listeria monocytogenes, Salmonella spp., Salmonella enterica, Listeria innocua, Lactobacillus sakei, Bronchotrix ther-mosphacta, Clostridium perfringens, Clostridium botulinum, Campylobacter spp., Staphylococcus aureus, Streptococcus, Norovirus, Toxoplasma gondii, gondii, Cyclospora spp., Bacillus cereus, Cronobacter sakazakii, Shigella spp., Vibrio spp., Vibrio cholerae, Vibrio parahaemolyticus, Vibrio vulnificus, Yersinia entero-colitica, Yersinia pseudotuberculosis, Brucella spp.), Corynebacterium ulcerans, Coxiella burnetii, Plesiomonas shigelloides, Aeromonas hydrophila, Aeromonas caviae, Aeromonas sobria, Rhizopus stolonifer, Penicillium commune, Aspergillus parasiticus, Aspergillus flavus, Alternaria spp., Fusarium moniliforme, Cephalosporium, Fusarium, Myrothecium, Stachybotrys, as well as Trichoderma, Hepatitis A, Cyclospora cayetanensis, and Trichinella spiralis. The presence of oxygen can also lead to flavor deterioration or rancidity due to oxidation and cause food discoloration, for example, a reduction in the redness of meat products. Discoloration is particularly relevant when foods are stored under light. The negative impact of the presence of oxygen impairs edibility as well as appearance, texture, and taste, and thus also impairs consumer acceptance, which in turn limits or shortens the shelf life of foods. This oxygen scavenging activity also prevents or reduces the degradation of vitamin C in fruit or vegetable juices, such as orange juice, for example.

[0554] The activated sheetlike elements of the present invention contain an amount of oxygen scavenger sufficient to achieve the desired oxygen reduction in food packaging. One skilled in the art will adjust, for example, the dimensions of the sheetlike element, the composition and amount of the coating layer present on the substrate layer, and the amount of base loaded onto the sheetlike elements of the present invention, as taught herein, in order to achieve the desired effect in food packaging.

[0555] For example, the corresponding amount can be adjusted so that the at least one oxygen scavenger is present in the food package in an amount of 0.0005-10 mg / cm 3 Head space, preferably 0.001-5 mg / cm 3 Head space, more preferably 0.005-2 mg / cm 3 Headspace or 0.01-1 mg / cm 3Additionally or alternatively, the corresponding amount can be adjusted so that the coating layer is present in an amount of 0.05-10 cm 2 / cm 3 Head space, preferably 0.1-5 cm 2 / cm 3 Head space, more preferably 0.2-2 cm 2 / cm 3 Head space, e.g. about 0.25 cm 2 / cm 3 Headspace. For the purposes of the present invention, the "headspace" of a food package is considered to be the amount of gas (eg, air or a modified atmosphere) present in the food package.

[0556] Preferably, the food is stored at a temperature commonly used for storing cooled or refrigerated foods, i.e. 0° C. to 14° C., preferably 3° C. to 10° C., more preferably 4° C. to 7° C., for example 7±1° C. However, the food can also be stored at room temperature, i.e. 15° C. to 30° C., preferably 18° C. to 25° C., for example 18° C. to 22° C. Thus, the shelf life of the food in the food packaging can be extended.

[0557] In a preferred embodiment of the present invention, the activated sheetlike element according to the invention removes at least 90%, preferably at least 95%, of oxygen from the headspace of a food packaging at 20±2°C within 12 hours.

[0558] In another preferred embodiment of the present invention, the activated sheetlike element of the present invention removes at least 90%, preferably at least 95% of oxygen from the head space of the food packaging at 4±2°C within 48 hours, preferably within 24 hours, more preferably within 12 hours, and most preferably within 6 hours.

[0559] In another preferred embodiment, the activated sheetlike elements according to the invention are used to maintain the oxygen content in the headspace of food packaging below 0.5% by volume, preferably below 0.2% by volume, more preferably below 0.1% by volume during storage for at least 21 days.

[0560] In yet another embodiment of the present invention, the activated sheetlike element of the present invention is used in combination with a modified atmosphere packaging as described above to achieve a synergistic oxygen scavenging effect and a synergistic effect on extending shelf life. Thus, in a particularly preferred embodiment of the present invention, the activated sheetlike element of the present invention removes at least 90%, preferably at least 95%, of the residual oxygen from the modified atmosphere headspace of the food packaging at 20±2°C within 12 hours.

[0561] In another preferred embodiment, the activated sheetlike elements of the present invention are used to maintain the oxygen content in the modified atmosphere headspace of food packaging below 0.5 vol.%, preferably below 0.2 vol.%, more preferably below 0.1 vol.% during storage for at least 21 days.

[0562] The scope and benefits of the present invention will be better understood based on the following examples, which are intended to illustrate certain embodiments of the invention and are non-limiting.

[0563] Example

[0564] Materials and methods

[0565] Gallic acid was purchased from Acros Organics as the monohydrate. Acronal 500D was purchased from BASF.

[0566] SRCC: SRCC was obtained by preparing 350 1 of an aqueous suspension of ground calcium carbonate in a mixing vessel by adjusting the solids content of ground limestone calcium carbonate from Omya SAS (Orgon) having a mass-based median particle size of 1.3 μm so as to obtain a solids content of 10% by weight, based on the total weight of the aqueous suspension.

[0567] While the slurry was being mixed at a speed of 6.2 m / s, 11.2 kg of phosphoric acid was added to the suspension in the form of an aqueous solution containing 30% by weight of phosphoric acid over a period of 20 minutes at a temperature of 70° C. After the addition of the acid, the slurry was stirred for a further 5 minutes before being removed from the container and dried using a spray dryer.

[0568] The volume median particle size of the SRCC was 6.6 μm, and the volume-based top cut (d 98 ) is 14.5 μm, and the BET specific surface area is 60 m 2 / g, and the intrusive specific pore volume of the particles is 0.939 cm 3 / g (for the pore size range of 0.004-0.51 μm), which is used as a particulate filler.

[0569] Untreated calcium carbonate 1: marble from Italy; d 50 (vol)=1.83μm,d 98 (vol) = 7 μm (Malvern 3000; dry).

[0570] Dispersant: 100% sodium neutralized polyacrylate dispersant, molecular weight MW about 4500 g / mol, polydispersity index IP 1.6 (2 g, 42% solids content)

[0571] Binder: Acronal 500D: polyacrylate binder (15 g, 46% solids content by weight).

[0572] Preparation of coating formulations

[0573] Gallic acid (50 g, 0.26 mol) was suspended in water (978 mL) and untreated calcium carbonate 1 (13 g, 0.13 mol) was slowly added. The mixture was stirred for 15 minutes. A dispersant (2 g) was added and SRCC (50 g) was gradually dispersed into the formulation. The pH of the binder (15 g) was adjusted to pH 8.5 and added to the previous formulation. The coating formulation was stirred for another 15 minutes until use. Typically, the coating formulation is characterized by a solids content of 40%, a pH of 6.2, and a viscosity of 170 mPas (100 RPM).

[0574] Preparation of sheet element precursors

[0575] Handmade

[0576] PET folios (Hostaphan RN 100, 100 μm, PützFolien) were coated with a K303 Multicoater from Erichsen (using a 9-type rod at a speed setting of 5). The samples were dried using an IR and air dryer (set at 110° C.) to obtain a 55 g / m 2 coating.

[0577] The total intrusive specific pore volume of the coating was determined to be 0.232 cm 3 / g.

[0578] machine

[0579] PET bisections (Hostaphan RN 100, 100 μm, PützFolien) were coated with a Durrer coating machine (see Figure 2 ) was applied. To apply the coating formulation, the following parameters were used: rod C50, rod pressure (1 bar), IR and air dryer (set to 150° C.) and a speed of 5 m / min. 2 Apply the coating.

[0580] Example 1 - Oxygen Scavenging Activity (OSA) of Sheetlike Elements Activated with Different Aqueous Alkaline Components

[0581] The above machine coating method was used to produce a coating weight of 22 g / m 2The sheet elements were coated with a gallic acid-based layer and cut into rectangular pieces of 6 x 11 cm. The sheet elements were packaged separately in empty high-barrier trays (PS-EVOH-PE, with skin, 0.5 mm, 204 x 147 mm, 14 mm high, 10 mm thick) using a tray sealer T200 (MULTIVAC, Hünenberg, Switzerland) together with oxygen sensor points (PSt 6, PreSens Precision Sensing GmbH, Regensburg, Germany) under an atmosphere containing 98% by volume of N2 and 2% by volume of O2. &Co AG, Muri, Switzerland; volume 350cm 3 ). A glass petri dish containing water was also added to the tray to provide a relative humidity of approximately 100%. The headspace volume was set to 250 cm by adding glass beads. 3 The relative humidity was monitored by a hygrometer (testo 174H, testo SE & Co. KGaA, Lenzkirch, Germany).

[0582] Before sealing, different aqueous alkaline solutions (130 μL ± 10 μL each) were added to each sheet element using an E2 EUR spray bench system (Nordson EFD). The packaged and sealed trays were stored at 21°C, and the oxygen concentration was measured non-destructively using a fiber-optic Fibox 4trace (PreSens Precision Sensing GmbH, Regensburg, Germany). Each measurement was performed in quadruplicate. The results were averaged and summarized in Tables 1 and Figure 1 The oxygen clearance rate (OSR) is the total amount of oxygen (expressed in mL) removed per gram of calcium gallate (CGA) during the measurement time (expressed in days).

[0583] Table 1. OSA of sheetlike elements activated with different aqueous alkaline components.

[0584]

[0585] a) Residual oxygen content after 1142 hours: 0.23% by volume, b) Residual oxygen content after 282.3 hours: 0.053% by volume, c) Residual oxygen content after 1142 hours: 0.37% by volume.

[0586] Once activated with a sufficiently high amount of base (in Example 1, greater than 4 mole % relative to the oxygen scavenger), the sheet-like element is able to effectively scavenge oxygen from the surrounding headspace. The best results were obtained using potassium carbonate, which scavenged essentially all of the oxygen present in the tray in less than 6 hours.

[0587] Example 2 - Effect of the amount of alkaline aqueous solution on OSA

[0588] The experiment of Example 1 using 1 M K2CO3 was repeated except that different amounts of aqueous alkaline component were applied to the sheet-like element. The results are summarized in Table 2.

[0589] Table 2. Oxygen content over time with different amounts of alkali at 21°C

[0590]

[0591] The results showed that the amount of aqueous alkaline component only slightly affected the oxygen scavenging rate.

[0592] Example 3 - OSA of activated sheet elements under different environmental conditions

[0593] The experiment of Example 1 using 1 M K2CO3 was repeated, except that the petri dishes containing the saturated magnesium chloride solution were placed in a tray to provide a relative humidity of approximately 37%. The trays were stored at 21°C and 5°C, respectively. The results are summarized in Table 3.

[0594] Table 3. OSA of sheet elements activated with 1 M K2CO3 at 37% rH at different temperatures.

[0595]

[0596] It can be seen that the activated sheet-like element is able to reduce the amount of oxygen present in the tray to a level below 0.5% by volume at low relative humidity and even at relatively low temperatures, which are typically used for the storage of food products.

[0597] Example 4 - OSA of sheet-like elements activated under MAP conditions

[0598] The experiment of Example 1 using 1M K2CO3 was repeated except that the trays were packed under a modified atmosphere containing variable amounts of CO2 and N2 and 2% by volume O2. The results are summarized in Table 4.

[0599] Table 4. OSA of activated sheet elements at MAP and 21°C.

[0600]

[0601] It can be seen that the activated sheetlike element retains its oxygen scavenging activity in the presence of 30% by volume of carbon dioxide (the amount typically used in MAP) and even in the presence of 40% by volume of carbon dioxide.

[0602] Example 5 - Use of activated sheet elements in processed meat products

[0603] The above machine coating method was used to produce a coating weight of 23 g / m 2 The coated sheet element is cut into 75cm pieces 2 The sheet elements were loaded into trays containing different meat products (6 slices of cooked turkey ham, 4.5 slices of ham, or 5.5 slices of meatloaf (100 ± 2.8 g each)) and having a residual headspace volume of 150 mL. The sheet elements were activated by applying 150 μL of a 5M K2CO3 solution, and the trays were sealed in an atmosphere containing 1% by volume O2, 30% by volume CO2, and N2. After packaging, the samples were stored in the dark at 4°C and 78% rH. After 24 hours, the samples were stored under continuous illumination. All measurements were performed in triplicate. Packaging and oxygen content measurements were performed as described in Example 1.

[0604] The color of the meat product was measured using a tristimulus colorimeter (Chroma Meter CR-410). Before use, the instrument was calibrated for a white tile (Y = 85.4, x = 0.3176, y = 0.3341). The measurement used the CIE L*a*b* color space. For each sample, at least three different packages were used to measure lightness, red, and blue (CIE values ​​of L*, a*, and b*, respectively) three times at one location. The sample was calibrated using a lens. The measurement is taken through the packaging film, with the exact location of the measurement marked on the packaging film. The measurement location is chosen to maximize the uniformity of the visible meat in the packaging. Measurements at locations where the meat product contacts the top foil of the packaging are avoided, as this distorts the color change behavior of the meat product. Since the CIE a* value (redness) provides the best correlation with the visual assessment of the color of the meat product, the color change is described here by the change in redness (Δa* value). Based on the color measurement results, the change in redness (Δa*) is calculated using the following formula:

[0605]

[0606] The results are summarized in Table 5.

[0607] Table 5. OSA of activated sheet elements and processed meat products at a temperature of 4°C.

[0608]

[0609] As can be seen, the oxygen content in the headspace initially increased due to the presence of oxygen in the meat samples. During storage under dark conditions, the activated sheet elements effectively scavenged oxygen from the headspace, while during the same storage period, without the sheet elements, the oxygen content remained constant. Consequently, over a 21-day storage period, the activated sheet elements effectively prevented discoloration of the meat products, as indicated by the loss of red color. The sheet elements were able to maintain low oxygen levels in the packaging for at least 21 days. Notably, once the meat samples were irradiated, the oxygen content of the trays without the sheet elements also decreased. However, this decrease in oxygen content is believed to be due to microbial activity and, in this case, indicates spoilage of the meat samples. Therefore, under industrially relevant conditions, the activated sheet elements effectively prevented discoloration of the meat products and extended their shelf life.

[0610] Other aspects and embodiments of the invention are described below:

[0611] Aspect or embodiment 1: A kit for improving the shelf life of food, the kit comprising a) a sheet element assembly having

[0612] a1) a coating layer comprising

[0613] i) a particulate filler in an amount of 25 to 70% by weight, based on the total dry weight of the coating layer,

[0614] wherein the particulate filler comprises surface-reacted calcium carbonate in an amount of at least 50% by weight, based on the total amount of the particulate filler,

[0615] The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + The reaction product of the ion donor, wherein the carbon dioxide is passed through H3O + The ion donor process is formed in situ and / or supplied from an external source, and

[0616] The surface-reacted calcium carbonate has a specific surface area of ​​20-200 m2 measured by the BET method. 2 / g,

[0617] ii) a polymeric binder in an amount of 5 to 25% by weight based on the total dry weight of the coating layer, and

[0618] iii) at least one oxygen scavenger in an amount of 25 to 70% by weight, based on the total dry weight of the coating layer,

[0619] wherein the at least one oxygen scavenger is a compound having at least one benzene ring with at least two phenolic hydroxyl groups and at least one group R, wherein two of the at least two phenolic hydroxyl groups are arranged on the at least one benzene ring in an ortho or para position relative to each other, and wherein R is selected from the group consisting of a hydrogen atom, a hydroxyl group, an alkoxy group, an aryloxy group, an amino group, an alkyl group, an aryl group, and -YR 1 group, preferably, wherein R is -YR 1 group, in which

[0620] -Y is selected from a direct bond, a linear or branched alkylene group having 1 to 6 carbon atoms and

[0621] -CH=CH- group, preferably, Y is a direct bond, and

[0622] -R 1 is an alkoxycarbonyl group, an aryloxycarboxyl group, or a substantially completely deprotonated carboxyl group, and

[0623] a2) basal layer, and

[0624] b) a basic component comprising a compound having a pK of 6 or less b Value of base.

[0625] 2. The kit of embodiment 1, wherein the sheet element assembly comprises a coating layer, the coating layer

[0626] - having a total intrusive specific pore volume of 0.1-1.5 cm as measured by mercury intrusion porosimetry 3 / g, preferably 0.1-1.0cm 3 / g, and / or

[0627] - having a total intra-particle intrusive specific pore volume of 0.05-1.0 cm as measured by mercury intrusion porosimetry 3 / g, preferably 0.08-0.5cm 3 / g and more preferably 0.1-0.4 cm 3 / g, and / or

[0628] - having a total interparticle intrusive specific pore volume of 0.05-0.5 cm as measured by mercury intrusion porosimetry 3 / g, preferably 0.08-0.4cm 3 / g and more preferably 0.1-0.3 cm 3 / g, and / or

[0629] -Has a total occluded intrusive specific pore volume of 0.05-0.4 cm as measured by mercury intrusion porosimetry 3 / g, preferably 0.08-0.3cm 3 / g and more preferably 0.1-0.2cm3 / g, and / or

[0630] -1-200g / m 2 , preferably 2-150g / m 2 , more preferably 10-120g / m 2 An amount of is present on the base layer.

[0631] 3. The kit of any one of the preceding embodiments, wherein the coating comprises

[0632] - the polymer binder in an amount of 10-20% by weight, based on the total dry weight of the coating layer, and / or

[0633] - an amount of 30-60% by weight of the particulate filler, based on the total dry weight of the coating layer, and / or

[0634] - the oxygen scavenger in an amount of 30-60% by weight, based on the total dry weight of the coating layer.

[0635] 4. The kit according to any of the preceding embodiments, wherein the particulate filler comprises the surface-reacted calcium carbonate in an amount of at least 70% by weight, preferably at least 90% by weight, based on the total amount of the at least one particulate filler, and most preferably, the particulate filler consists of the surface-reacted calcium carbonate, and wherein any optionally present additional particulate filler material is selected from dolomite, ground calcium carbonate, precipitated calcium carbonate, magnesium hydroxide, talc, gypsum, titanium dioxide, kaolin, silicates, mica, barium sulfate, calcined clay, uncalcined (hydrous) clay, bentonite and mixtures thereof, and is preferably selected from ground calcium carbonate, precipitated calcium carbonate and mixtures thereof, and most preferably, wherein the particulate filler consists of the optionally present additional particulate filler material and the surface-reacted calcium carbonate.

[0636] 5. The kit of any one of the preceding embodiments, wherein the surface-reacted calcium carbonate

[0637] - With 50-120m 2 / g specific surface area, and / or

[0638] - having a porosity between 0.1 and 2.5 cm as measured by mercury intrusion porosimetry 3 / g, preferably 0.2-2.2cm 3 / g, more preferably 0.4-2.0cm 3 / g and most preferably 0.6-1.8cm 3 The total intra-particle intrusive specific pore volume is within the range of / g.

[0639] 6. The kit of any one of the preceding embodiments, wherein

[0640] - the at least one oxygen scavenger is chosen from phenolic acid derivatives having at least two phenolic hydroxyl groups arranged in ortho or para position relative to each other, cinnamic acid derivatives having at least two phenolic hydroxyl groups arranged in ortho or para position relative to each other, and mixtures thereof,

[0641] Preferably, the at least one oxygen scavenger is selected from the group consisting of gallic acid derivatives, digallic acid derivatives, protocatechuic acid derivatives, caffeic acid derivatives, 5-hydroxyferulic acid derivatives, gentisic acid derivatives, orsellinic acid derivatives, chebulic acid derivatives, phloroglucinolcarboxylic acid derivatives, chicoric acid derivatives, and mixtures thereof, even more preferably, the at least one oxygen scavenger is a gallic acid derivative,

[0642] wherein the acid derivative is selected from the group consisting of alkyl esters, aryl esters and substantially completely deprotonated acids of the corresponding acids,

[0643] And most preferably, the at least one oxygen scavenger is substantially completely deprotonated gallic acid, and / or

[0644] - the at least one oxygen scavenger comprising a substantially completely deprotonated carboxyl group comprises a cation selected from ammonium, sodium, lithium, potassium, cesium, magnesium, calcium and mixtures thereof, preferably, wherein the at least one oxygen scavenger comprises a cation selected from sodium, potassium, calcium, magnesium and mixtures thereof, and most preferably, the at least one oxygen scavenger comprises a calcium cation.

[0645] 7. The kit of any one of the preceding embodiments, wherein the polymer binder is selected from the group consisting of polyacrylic acid, its salts, its derivatives, starch, protein, styrene-butadiene latex, polyvinyl alcohol, polyvinyl acetate and mixtures thereof, preferably, wherein the polymer binder is selected from the group consisting of polyacrylic acid, its salts, its derivatives and mixtures thereof.

[0646] 8. The kit of any one of the preceding embodiments, wherein the substrate layer comprises one or more single substrate layers selected from polymer material layers, preferably made of polyethylene, polypropylene, polyethylene terephthalate, polylactic acid, polyhydroxybutyrate, polyethylene-2,5-furandicarboxylate, polystyrene or a mixture thereof; fibrous material layers, preferably made of cellulose acetate, viscose, polypropylene, polyethylene terephthalate, polylactic acid or a mixture thereof; paper layers; cardboard layers; textile layers; non-woven layers; layers made of bio-based materials; wood layers; bamboo layers; metal foil layers; aluminum layers; print-receptive coatings; and mixtures thereof, wherein the one or more single substrate layers are optionally subjected to corona treatment, and wherein preferably, the one or more single substrate layers are selected from polymer material layers.

[0647] 9. The kit of any one of the preceding embodiments, wherein the sheet element assembly further comprises

[0648] one or more adhesive layers, located on the substrate layer on the opposite side of the coating layer and / or between the individual substrate layers, wherein the adhesive layer is preferably selected from adhesives, sealants, rubber coatings, pressure-sensitive layers and mixtures thereof; and / or

[0649] - one or more primer layers, located between the base layer and the coating layer, and / or

[0650] - one or more oxygen permeable covering layers for covering the coating layer, preferably selected from oxygen permeable film layers, fiber material layers and non-woven fabric layers, and / or

[0651] - one or more protective layers for temporarily sealing the coating layer and / or the adhesive layer, preferably selected from polyethylene, polypropylene and / or coated paper.

[0652] 10. The kit of any one of the preceding embodiments, wherein the alkaline component comprises a base selected from hydroxide bases, carbonate bases, ammonia bases and mixtures thereof, preferably selected from lithium hydroxide, sodium hydroxide, potassium hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, cesium carbonate and mixtures thereof, and most preferably selected from sodium hydroxide, potassium carbonate and sodium carbonate.

[0653] 11. The kit of any one of the preceding embodiments, wherein the alkaline component is an aqueous alkaline component comprising the base and water, wherein preferably

[0654] - the pH of the aqueous alkaline component is at least 8, more preferably at least 10, even more preferably at least 11, most preferably at least 12, and / or

[0655] - the aqueous alkaline component comprises the base in an amount of 1 to 75 wt%, more preferably 5 to 60 wt% and most preferably 10-35 wt%, based on the total weight of the aqueous alkaline component.

[0656] Aspect or embodiment 12, an activated sheetlike element formed from the kit of any of the preceding embodiments by adding the alkaline component to the coating layer of the sheetlike element assembly, wherein the activated sheetlike element comprises the reaction product of the at least one oxygen scavenger and the base, wherein preferably

[0657] - the basic component is added in an amount such that the base is added in an amount of at least 0.01 molar equivalents, preferably at least 0.02 molar equivalents, more preferably at least 0.05 molar equivalents, even more preferably at least 0.1 molar equivalents, based on the molar amount of the oxygen scavenger, and / or

[0658] The amount of the basic component added is 10-70% by weight, preferably 20-65% by weight, more preferably 35-60% by weight, based on the total weight of the coating layer.

[0659] Aspect or embodiment 13. A method of making a kit for improving the shelf life of food, the method comprising the steps of:

[0660] a) providing a particulate filler comprising surface-reacted calcium carbonate in an amount of at least 50% by weight, based on the total amount of the particulate filler,

[0661] The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + The reaction product of the ion donor, wherein the carbon dioxide is passed through H3O + The ion donor process is formed in situ and / or supplied from an external source, and

[0662] The surface-reacted calcium carbonate has a specific surface area of ​​20-200 m2 measured by the BET method. 2 / g, preferably 50-120m 2 / g,

[0663] b) providing at least one oxygen scavenger, the at least one oxygen scavenger being a compound having at least one benzene ring with at least two phenolic hydroxyl groups and at least one group R, wherein two of the at least two phenolic hydroxyl groups are located on the at least one benzene ring in an ortho or para position relative to each other, and wherein R is selected from the group consisting of a hydrogen atom, a hydroxyl group, an alkoxy group, an aryloxy group, an amino group, an alkyl group, an aryl group, and -YR 1 group, preferably, wherein R is -YR 1 group, in which

[0664] -Y is selected from a direct bond, a linear or branched alkylene group having 1 to 6 carbon atoms and

[0665] -CH=CH- group, preferably, Y is a direct bond, and

[0666] -R 1 is an alkoxycarbonyl group, an aryloxycarboxyl group or a substantially completely deprotonated carboxyl group,

[0667] c) providing a polymer binder,

[0668] d) providing a substrate layer comprising one or more individual substrate layers or a food packaging comprising the substrate layer,

[0669] e) mixing the oxygen scavenger of step b), the particulate filler of step a) and the polymeric binder of step c) in the order given therein to obtain a coating composition,

[0670] f) applying the coating composition of step e) to the substrate layer of step d) to obtain a sheet-like element precursor,

[0671] g) drying the sheet-like element precursor obtained in step f) to obtain a sheet-like element assembly,

[0672] h) providing a basic component comprising a compound having a pK of 6 or less b value of base, and optionally

[0673] i) mixing the alkaline component of step h) with water to obtain an aqueous alkaline component comprising the base and water, wherein preferably,

[0674] - the pH of the aqueous alkaline component is at least 8, more preferably at least 10, even more preferably at least 11, and most preferably at least 12, and / or

[0675] - the aqueous alkaline component comprises the base in an amount of 1 to 75 wt%, more preferably 5 to 60 wt% and most preferably 10 to 35 wt%, based on the total weight of the aqueous alkaline component.

[0676] Aspect or embodiment 14. A method of manufacturing a sheet-like component assembly, the method comprising the steps of:

[0677] a) providing a particulate filler comprising surface-reacted calcium carbonate in an amount of at least 50% by weight, based on the total amount of the particulate filler,

[0678] The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + The reaction product of the ion donor, wherein the carbon dioxide is passed through H3O + The ion donor process is formed in situ and / or supplied from an external source, and

[0679] The surface-reacted calcium carbonate has a specific surface area of ​​20-200 m2 measured by the BET method. 2 / g, preferably 50-120m 2 / g,

[0680] b) providing at least one oxygen scavenger, the at least one oxygen scavenger being a compound having at least one benzene ring with at least two phenolic hydroxyl groups and at least one group R, wherein two of the at least two phenolic hydroxyl groups are located on the at least one benzene ring in an ortho or para position relative to each other, and wherein R is -YR 1 group, in which

[0681] -Y is selected from a direct bond, a linear or branched alkylene group having 1 to 6 carbon atoms and

[0682] -CH=CH- group, preferably, Y is a direct bond, and

[0683] -R 1is a carboxyl group that is essentially completely deprotonated,

[0684] c) providing a polymer binder,

[0685] d) providing a substrate layer comprising one or more individual substrate layers or a food packaging comprising the substrate layer,

[0686] e) mixing the oxygen scavenger of step b), the particulate filler of step a) and the polymeric binder of step c) in the order given therein to obtain a coating composition,

[0687] f) applying the coating composition of step e) onto the substrate layer of step d) to obtain a sheet-like element precursor, and

[0688] g) drying the sheet-like element precursor obtained in step f) to obtain a sheet-like element assembly,

[0689] wherein step b) of providing the at least one oxygen scavenger comprises the following sub-steps:

[0690] b1) providing at least one oxygen scavenger precursor, which is a compound having at least one benzene ring with at least two phenolic hydroxyl groups and at least one group R, wherein two of the at least two phenolic hydroxyl groups are located on the at least one benzene ring in an ortho- or para-position relative to each other, and wherein R is -YR 1 group, in which

[0691] -Y is selected from a direct bond, a linear or branched alkylene group having 1 to 6 carbon atoms and a -CH=CH- group, preferably, Y is a direct bond, and

[0692] -R 1 It is a carboxyl group,

[0693] b2) providing a basic compound, and

[0694] b3) reacting the carboxyl group of the oxygen scavenger precursor of step b1) with the basic compound of step b2) to obtain the oxygen scavenger.

[0695] 15. The method of embodiment 14, wherein the alkaline compound of step b2) is selected from carbonate bases, hydroxide bases, bicarbonate bases, amine bases and mixtures thereof, and is more preferably selected from sodium carbonate, sodium bicarbonate, sodium hydroxide, potassium carbonate, potassium bicarbonate, potassium hydroxide, calcium carbonate, calcium bicarbonate, calcium hydroxide, magnesium carbonate, magnesium bicarbonate, magnesium hydroxide, ammonia and mixtures thereof, and is most preferably calcium carbonate.

[0696] 16. The method according to any one of embodiments 13-15, wherein

[0697] - the mixing step e) is carried out in the presence of a solvent, preferably water, and / or

[0698] - the application step f) is carried out by means of roller coating, dip coating, grooved rod coating, curtain coating, hard blade coating, coating roller coating, fountain coating, spray coating, short dwell coating, slot die coating, curved blade coating, bevel blade coating, air knife coating, rod coating, gravure coating, conventional or metered size press coating, spray application techniques, screen printing and / or wet lamination, preferably roller coating, and / or

[0699] - Drying step g) is carried out at a temperature of 50-150° C. under ambient pressure or under reduced pressure, preferably by hot air drying, IR radiation drying or UV radiation drying.

[0700] 17. The method of any one of embodiments 13-16, wherein the sheet element assembly comprises a coating layer, the coating layer

[0701] - having a total intrusive specific pore volume of 0.1-1.5 cm as measured by mercury intrusion porosimetry 3 / g, preferably 0.1-1.0cm 3 / g, and / or

[0702] - having a total intra-particle intrusive specific pore volume of 0.05-1.0 cm as measured by mercury intrusion porosimetry 3 / g, preferably 0.08-0.5cm 3 / g and more preferably 0.1-0.4 cm 3 / g, and / or

[0703] - having a total interparticle intrusive specific pore volume of 0.05-0.5 cm as measured by mercury intrusion porosimetry 3 / g, preferably 0.08-0.4cm 3 / g and more preferably 0.1-0.3 cm 3 / g, and / or

[0704] -Has a total occluded intrusive specific pore volume of 0.05-0.4 cm as measured by mercury intrusion porosimetry 3 / g, preferably 0.08-0.3cm 3 / g and more preferably 0.1-0.2cm 3 / g, and / or

[0705] -1-200g / m 2 , preferably 2-150g / m 2 , more preferably 10-120g / m 2 An amount of is present on the base layer.

[0706] 18. The method of any one of embodiments 13-17, wherein the coating layer comprises

[0707] - the polymer binder in an amount of 10-20% by weight, based on the total dry weight of the coating layer, and / or

[0708] - an amount of 30-60% by weight of the particulate filler, based on the total dry weight of the coating layer, and / or

[0709] - the oxygen scavenger in an amount of 30-60% by weight, based on the total dry weight of the coating layer.

[0710] 19. The method of any one of embodiments 13 to 18, wherein the particulate filler comprises the surface-reacted calcium carbonate in an amount of at least 70% by weight, preferably at least 90% by weight, based on the total amount of the at least one particulate filler, and most preferably, the particulate filler consists of the surface-reacted calcium carbonate, and wherein any optionally present additional particulate filler material is selected from dolomite, ground calcium carbonate, precipitated calcium carbonate, magnesium hydroxide, talc, gypsum, titanium dioxide, kaolin, silicates, mica, barium sulfate, calcined clay, uncalcined (hydrous) clay, bentonite and mixtures thereof, and is preferably selected from ground calcium carbonate, precipitated calcium carbonate and mixtures thereof, and most preferably, wherein the particulate filler consists of the optionally present additional particulate filler material and the surface-reacted calcium carbonate.

[0711] 20. The method of any one of embodiments 13-19, wherein the surface-reacted calcium carbonate

[0712] - With 50-120m 2 / g specific surface area, and / or

[0713] - having a porosity between 0.1 and 2.5 cm as measured by mercury intrusion porosimetry 3 / g, preferably 0.2-2.2cm 3 / g, more preferably 0.4-2.0cm 3 / g and most preferably 0.6-1.8cm 3 The total intra-particle intrusive specific pore volume is within the range of / g.

[0714] 21. The method according to any one of embodiments 13-20, wherein

[0715] - the at least one oxygen scavenger is chosen from phenolic acid derivatives having at least two phenolic hydroxyl groups arranged in ortho or para position relative to each other, cinnamic acid derivatives having at least two phenolic hydroxyl groups arranged in ortho or para position relative to each other, and mixtures thereof,

[0716] Preferably, the at least one oxygen scavenger is selected from the group consisting of gallic acid derivatives, digallic acid derivatives, protocatechuic acid derivatives, caffeic acid derivatives, 5-hydroxyferulic acid derivatives, gentisic acid derivatives, orsellinic acid derivatives, chebulic acid derivatives, phloroglucinolcarboxylic acid derivatives, chicoric acid derivatives, and mixtures thereof, even more preferably, the at least one oxygen scavenger is a gallic acid derivative,

[0717] wherein the acid derivative is selected from the group consisting of alkyl esters, aryl esters and substantially completely deprotonated acids of the corresponding acids,

[0718] And most preferably, the at least one oxygen scavenger is substantially completely deprotonated gallic acid, and / or

[0719] - the at least one oxygen scavenger comprising a substantially completely deprotonated carboxyl group comprises a cation selected from ammonium, sodium, lithium, potassium, cesium, magnesium, calcium and mixtures thereof, preferably, wherein the at least one oxygen scavenger comprises a cation selected from sodium, potassium, calcium, magnesium and mixtures thereof, and most preferably, the at least one oxygen scavenger comprises a calcium cation.

[0720] 22. The method according to any one of embodiments 13 to 21, wherein the polymer binder is selected from the group consisting of polyacrylic acid, its salts, its derivatives, starch, protein, styrene-butadiene latex, polyvinyl alcohol, polyvinyl acetate and mixtures thereof, preferably, wherein the polymer binder is selected from the group consisting of polyacrylic acid, its salts, its derivatives and mixtures thereof.

[0721] 23. The method of any one of embodiments 13-22, wherein the substrate layer comprises one or more single substrate layers selected from polymer material layers, preferably made of polyethylene, polypropylene, polyethylene terephthalate, polylactic acid, polyhydroxybutyrate, polyethylene-2,5-furandicarboxylate, polystyrene or a mixture thereof; a fiber material layer, preferably made of cellulose acetate, viscose, polypropylene, polyethylene terephthalate, polylactic acid or a mixture thereof; a paper layer; a cardboard layer; a textile layer; a non-woven layer; a layer made of bio-based material; a wood layer; a bamboo layer; a metal foil layer; an aluminum layer; a print-receptive coating; and a mixture thereof, wherein the one or more single substrate layers are optionally subjected to corona treatment, and wherein preferably, the one or more single substrate layers are selected from polymer material layers.

[0722] 24. The method of any one of embodiments 13-23, wherein the sheet element assembly further comprises

[0723] one or more adhesive layers, located on the substrate layer on the opposite side of the coating layer and / or between the individual substrate layers, wherein the adhesive layer is preferably selected from adhesives, sealants, rubber coatings, pressure-sensitive layers and mixtures thereof; and / or

[0724] - one or more primer layers, located between the base layer and the coating layer, and / or

[0725] - one or more oxygen permeable covering layers for covering the coating layer, preferably selected from oxygen permeable film layers, fiber material layers and non-woven fabric layers, and / or

[0726] - one or more protective layers for temporarily sealing the coating layer and / or the adhesive layer, preferably selected from polyethylene, polypropylene and / or coated paper.

[0727] 25. The method of any one of embodiments 13-24, wherein the alkaline component comprises a base selected from hydroxide bases, carbonate bases, ammonia bases and mixtures thereof, preferably selected from lithium hydroxide, sodium hydroxide, potassium hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, cesium carbonate and mixtures thereof, and most preferably selected from sodium hydroxide, potassium carbonate and sodium carbonate.

[0728] 26. The method of any one of embodiments 13 to 25, wherein the alkaline component is an aqueous alkaline component comprising the base and water, wherein preferably

[0729] - the pH of the aqueous alkaline component is at least 8, more preferably at least 10, even more preferably at least 11, most preferably at least 12, and / or

[0730] - the aqueous alkaline component comprises the base in an amount of 1 to 75 wt%, more preferably 5 to 60 wt% and most preferably 10-35 wt%, based on the total weight of the aqueous alkaline component.

[0731] Aspect or embodiment 27, an activated sheetlike element formed from the kit of any of the preceding embodiments by adding the alkaline component to the coating layer of the sheetlike element assembly, wherein the activated sheetlike element comprises the reaction product of the at least one oxygen scavenger and the base, wherein preferably

[0732] - the basic component is added in an amount such that the base is added in an amount of at least 0.01 molar equivalents, preferably at least 0.02 molar equivalents, more preferably at least 0.05 molar equivalents, even more preferably at least 0.1 molar equivalents, based on the molar amount of the oxygen scavenger, and / or

[0733] The amount of the basic component added is 10-70% by weight, preferably 20-65% by weight, more preferably 35-60% by weight, based on the total weight of the coating layer.

[0734] 28. An activated sheet-like element according to embodiment 27, wherein the alkaline component comprises a base selected from hydroxide bases, carbonate bases, ammonia bases and mixtures thereof, preferably selected from lithium hydroxide, sodium hydroxide, potassium hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, cesium carbonate and mixtures thereof, and most preferably selected from sodium hydroxide, potassium carbonate and sodium carbonate.

[0735] Aspect or embodiment 29, a method for activating the set of sheetlike elements of any one of embodiments 1-11, comprising the steps of:

[0736] j) mixing the alkaline component with water to obtain an aqueous alkaline component comprising the base and water, and

[0737] k) applying the aqueous alkaline component to at least a portion of the surface of the coating layer, wherein preferably,

[0738] - the basic component is added in an amount such that the base is added in an amount of at least 0.01 molar equivalents, preferably at least 0.02 molar equivalents, more preferably at least 0.05 molar equivalents, even more preferably at least 0.1 molar equivalents, based on the molar amount of the oxygen scavenger, and / or

[0739] - the amount of the basic component added is 10-70% by weight, preferably 20-65% by weight, more preferably 35-60% by weight, based on the total weight of the coating layer, and / or

[0740] - the applying step k) is performed by inkjet printing, spraying, coating and / or dripping.

[0741] 30. The method of embodiment 29, wherein the alkaline component comprises a base selected from the group consisting of hydroxide bases, carbonate bases, ammonia bases and mixtures thereof, preferably selected from the group consisting of lithium hydroxide, sodium hydroxide, potassium hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, cesium carbonate and mixtures thereof, and most preferably selected from the group consisting of sodium hydroxide, potassium carbonate and sodium carbonate.

[0742] 31. The kit according to any one of embodiments 1-11, further comprising

[0743] - a supply device containing the sheet element assembly, wherein the supply device preferably comprises a roller or a magazine, or

[0744] - A food packaging comprising the sheetlike element assembly, wherein the coating layer is present within the food packaging.

[0745] 32. A supply device comprising the activated sheet-like elements according to embodiment 27 or 28, wherein the supply device protects the activated sheet-like elements from oxygen and preferably comprises a roll, a stack, a magazine or a package, such as a box.

[0746] Aspect or embodiment 33. Food packaging comprising the activated sheetlike element of embodiment 27 or 28, wherein the coating layer is present within the food packaging.

[0747] Aspect or embodiment 34. Use of the kit according to any one of embodiments 1 to 11 or the activated sheetlike element according to embodiment 27 or 28 in food packaging.

[0748] Aspect or embodiment 35, use of the kit according to any one of embodiments 1 to 11 or the activated sheetlike element according to embodiment 27 or 28 for extending the shelf life of food.

Claims

1. A kit for improving the shelf life of food, the kit comprising: a) a sheet element assembly having a1) a coating layer comprising i) a particulate filler in an amount of 25 to 70% by weight, based on the total dry weight of the coating layer, wherein the particulate filler comprises surface-reacted calcium carbonate in an amount of at least 50% by weight, based on the total amount of the particulate filler, The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + The reaction products of the ion donor, The carbon dioxide is passed through H3O + The ion donor process is formed in situ and / or supplied from an external source, and The surface-reacted calcium carbonate has a specific surface area of ​​20-200 m2 measured by the BET method. 2 / g, ii) a polymeric binder in an amount of 5 to 25% by weight based on the total dry weight of the coating layer, and iii) at least one oxygen scavenger in an amount of 25 to 70% by weight, based on the total dry weight of the coating layer, wherein the at least one oxygen scavenger is a compound having at least one benzene ring, The benzene ring carries at least two phenolic hydroxyl groups and at least one group R, wherein two of the at least two phenolic hydroxyl groups are arranged on the at least one benzene ring in an ortho or para position relative to each other, and wherein R is selected from a hydrogen atom, a hydroxyl group, an alkoxy group, an aryloxy group, an amino group, an alkyl group, an aryl group and -YR 1 group, in which -Y is selected from a direct bond, a linear or branched alkylene radical having 1 to 6 carbon atoms and a -CH=CH- radical, and -R 1 is an alkoxycarbonyl group, an aryloxycarboxyl group, or a substantially completely deprotonated carboxyl group, and a2) basal layer, and b) an alkaline component comprising i) has a pK of 6 or less b value of base, and ii) Water.

2. The kit of claim 1, wherein R is -YR 1 group.

3. The kit of claim 2, wherein Y is a direct bond.

4. The kit of claim 1 , wherein the sheet element assembly comprises a coating having a total intrusive specific pore volume of 0.1 to 1.5 cm 3 as measured by mercury intrusion porosimetry. 3 / g.

5. The kit of claim 4, wherein the sheet element assembly comprises a coating layer having a total intrusive specific pore volume of 0.1 to 1.0 cm2 as measured by mercury intrusion porosimetry. 3 / g.

6. The kit of claim 1 , wherein the sheet element assembly comprises a coating layer having a total intra-particle intrusive specific pore volume of 0.05 to 1.0 cm 2 as measured by mercury intrusion porosimetry. 3 / g.

7. The kit of claim 6, wherein the sheet element assembly comprises a coating layer having a total intra-particle intrusive specific pore volume of 0.08 to 0.5 cm-1 as measured by mercury intrusion porosimetry. 3 / g.

8. The kit of claim 7, wherein the sheet element assembly comprises a coating layer having a total intra-particle intrusive specific pore volume of 0.1 to 0.4 cm as measured by mercury intrusion porosimetry. 3 / g.

9. The kit of claim 1 , wherein the sheet element assembly comprises a coating layer having a total interparticle intrusive specific pore volume of 0.05 to 0.5 cm 2 as measured by mercury intrusion porosimetry. 3 / g.

10. The kit of claim 9, wherein the sheet element assembly comprises a coating layer having a total interparticle intrusive specific pore volume of 0.08 to 0.4 cm-1 as measured by mercury intrusion porosimetry. 3 / g.

11. The kit of claim 10, wherein the sheet element assembly comprises a coating layer having a total interparticle intrusive specific pore volume of 0.1 to 0.3 cm-1 as measured by mercury intrusion porosimetry. 3 / g.

12. The kit of claim 1, wherein the sheet element assembly comprises a coating having a total blocked intrusive specific pore volume of 0.05 to 0.4 cm2 as measured by mercury intrusion porosimetry. 3 / g.

13. The kit of claim 12, wherein the sheet element assembly comprises a coating having a total blocked intrusive specific pore volume of 0.08 to 0.3 cm2 as measured by mercury intrusion porosimetry. 3 / g.

14. The kit of claim 13, wherein the sheet element assembly comprises a coating having a total occluded intrusive specific pore volume of 0.1 to 0.2 cm2 as measured by mercury intrusion porosimetry. 3 / g.

15. The kit of claim 1, wherein the sheet element assembly comprises a coating layer having a thickness of 1 to 200 g / m 2 An amount of is present on the base layer.

16. The kit of claim 15, wherein the sheet element assembly comprises a coating layer having a density of 2 to 150 g / m 2 An amount of is present on the base layer.

17. The kit of claim 16, wherein the sheet element assembly comprises a coating layer having a coating weight of 10-120 g / m 2 An amount of is present on the base layer.

18. The kit of claim 1, wherein the coating layer comprises the polymeric binder in an amount of 10-20 weight percent based on the total dry weight of the coating layer.

19. The kit of claim 1, wherein the coating layer comprises the particulate filler in an amount of 30-60% by weight based on the total dry weight of the coating layer.

20. The kit of claim 1, wherein the coating layer comprises the oxygen scavenger in an amount of 30-60 weight percent based on the total dry weight of the coating layer.

21. The kit of claim 1, wherein the particulate filler comprises the surface-reacted calcium carbonate in an amount of at least 70 weight percent, based on the total weight of the at least one particulate filler.

22. The kit of claim 21, wherein the particulate filler comprises the surface-reacted calcium carbonate in an amount of at least 90% by weight, based on the total weight of the at least one particulate filler.

23. The kit of claim 22, wherein the particulate filler consists of the surface-reacted calcium carbonate.

24. The kit of claim 21, wherein any optional additional particulate filler material is selected from the group consisting of dolomite, ground calcium carbonate, precipitated calcium carbonate, magnesium hydroxide, talc, gypsum, titanium dioxide, kaolin, silicates, mica, barium sulfate, calcined clay, uncalcined hydrous clay, bentonite, and mixtures thereof.

25. The kit of claim 24, wherein any optional additional particulate filler material is selected from ground calcium carbonate, precipitated calcium carbonate, and mixtures thereof.

26. The kit of claim 25, wherein the particulate filler consists of the optional additional particulate filler material and the surface-reacted calcium carbonate.

27. The kit of claim 1, wherein the surface-reacted calcium carbonate has a surface area of ​​50 to 120 m 2 / g specific surface area.

28. The kit of claim 1, wherein the surface-reacted calcium carbonate has a porosity of 0.1-2.5 cm as measured by mercury intrusion porosimetry. 3 The total intra-particle intrusive specific pore volume is within the range of / g.

29. The kit of claim 28, wherein the surface-reacted calcium carbonate has a porosity of 0.2-2.2 cm as measured by mercury intrusion porosimetry. 3 The total intra-particle intrusive specific pore volume is within the range of / g.

30. The kit of claim 29, wherein the surface-reacted calcium carbonate has a porosity of 0.4-2.0 cm as measured by mercury intrusion porosimetry. 3 The total intra-particle intrusive specific pore volume is within the range of / g.

31. The kit of claim 30, wherein the surface-reacted calcium carbonate has a porosity of 0.6-1.8 cm as measured by mercury intrusion porosimetry. 3 The total intra-particle intrusive specific pore volume is within the range of / g.

32. The kit of claim 1 , wherein the at least one oxygen scavenger is selected from the group consisting of phenolic acid derivatives having at least two phenolic hydroxyl groups arranged in ortho or para position relative to each other, cinnamic acid derivatives having at least two phenolic hydroxyl groups arranged in ortho or para position relative to each other, and mixtures thereof, The acid derivative is selected from the group consisting of alkyl esters, aryl esters and substantially completely deprotonated acids of the corresponding acids.

33. The kit of claim 32, wherein the at least one oxygen scavenger is selected from the group consisting of gallic acid derivatives, digallic acid derivatives, protocatechuic acid derivatives, caffeic acid derivatives, 5-hydroxyferulic acid derivatives, gentisic acid derivatives, erotic acid derivatives, chebulic acid derivatives, phloroglucinolcarboxylic acid derivatives, chicoric acid derivatives, and mixtures thereof, wherein the acid derivative is selected from the group consisting of alkyl esters, aryl esters, and substantially fully deprotonated acids of the corresponding acids.

34. The kit of claim 33, wherein the at least one oxygen scavenger is a gallic acid derivative, wherein the acid derivative is selected from the group consisting of alkyl esters, aryl esters, and substantially fully deprotonated acids of the corresponding acid.

35. The kit of claim 34, wherein the at least one oxygen scavenger is substantially fully deprotonated gallic acid.

36. The kit of any one of claims 32-35, wherein the at least one oxygen scavenger comprising substantially completely deprotonated carboxyl groups comprises a cation selected from the group consisting of ammonium, sodium, lithium, potassium, cesium, magnesium, calcium, and mixtures thereof.

37. The kit of claim 36, wherein the at least one oxygen scavenger comprising substantially completely deprotonated carboxyl groups comprises a cation selected from the group consisting of sodium, potassium, calcium, magnesium, and mixtures thereof.

38. The kit of claim 37, wherein the at least one oxygen scavenger comprising substantially completely deprotonated carboxyl groups comprises a calcium cation.

39. The kit of claim 1, wherein the polymeric binder is selected from the group consisting of polyacrylic acid, salts of polyacrylic acid, derivatives of polyacrylic acid, starch, protein, styrene-butadiene latex, polyvinyl alcohol, polyvinyl acetate, and mixtures thereof.

40. The kit of claim 39, wherein the polymeric binder is selected from the group consisting of polyacrylic acid, salts of polyacrylic acid, derivatives of polyacrylic acid, and mixtures thereof.

41. The kit of claim 1 , wherein the substrate layer comprises one or more individual substrate layers selected from the group consisting of layers of polymeric material, layers of fibrous material, layers of paper, layers of paperboard, layers of textiles, layers of nonwovens, layers made from bio-based materials, layers of wood, layers of bamboo, layers of metal foil, layers of aluminum, layers of print receptive coatings, and mixtures thereof.

42. The kit of claim 41, wherein the substrate layer comprises one or more individual substrate layers selected from layers of polymeric material.

43. The kit of claim 42, wherein the layer of polymeric material is made of polyethylene, polypropylene, polyethylene terephthalate, polylactic acid, polyhydroxybutyrate, polyethylene-2,5-furandicarboxylate, polystyrene, or mixtures thereof.

44. The kit of claim 41, wherein the substrate comprises one or more individual substrate layers selected from a fibrous material layer made of cellulose acetate, viscose, polypropylene, polyethylene terephthalate, polylactic acid, or mixtures thereof.

45. The kit of claim 41, wherein the one or more individual substrate layers have been subjected to corona treatment.

46. ​​The kit of claim 1, wherein the sheet member assembly further comprises one or more adhesive layers located on the substrate layer on the opposite side of the coating layer and / or between individual substrate layers.

47. The kit of claim 46, wherein the one or more adhesive layers are selected from the group consisting of adhesives, sealants, rubber coatings, pressure sensitive layers, and mixtures thereof.

48. The kit of claim 1, wherein the sheet-like element assembly further comprises one or more primer layers positioned between the base layer and the coating layer.

49. The kit of claim 1, wherein the sheet member assembly further comprises one or more oxygen permeable cover layers covering the coating layer.

50. The kit of claim 49, wherein the one or more oxygen permeable cover layers are selected from the group consisting of an oxygen permeable membrane layer, a fibrous material layer, and a nonwoven fabric layer.

51. The kit of claim 46, wherein the sheet member assembly further comprises one or more protective layers for temporarily sealing the coating layer and / or the adhesive layer.

52. The kit of claim 51, wherein the one or more protective layers are selected from polyethylene, polypropylene and / or coated paper.

53. The kit of claim 1, wherein the alkaline component comprises a base selected from the group consisting of hydroxide bases, carbonate bases, ammonia bases, and mixtures thereof.

54. The kit of claim 53, wherein the alkaline component comprises a base selected from the group consisting of lithium hydroxide, sodium hydroxide, potassium hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, cesium carbonate, and mixtures thereof.

55. The kit of claim 54, wherein the alkaline component comprises a base selected from the group consisting of sodium hydroxide, potassium carbonate, and sodium carbonate.

56. The kit of claim 1, wherein the alkaline component is an aqueous alkaline component comprising the base and water.

57. The kit of claim 56, wherein the pH of the aqueous alkaline component is at least 8.

58. The kit of claim 57, wherein the aqueous alkaline component has a pH of at least 10.

59. The kit of claim 58, wherein the pH of the aqueous alkaline component is at least 11.

60. The kit of claim 59, wherein the aqueous alkaline component has a pH of at least 12.

61. The kit of claim 56, wherein the aqueous alkaline component comprises the base in an amount of 1 weight percent to 75 weight percent based on the total weight of the aqueous alkaline component.

62. The kit of claim 61, wherein the aqueous alkaline component comprises the base in an amount of 5 wt% to 60 wt% based on the total weight of the aqueous alkaline component.

63. The kit of claim 62, wherein the aqueous alkaline component comprises the base in an amount of 10-35% by weight based on the total weight of the aqueous alkaline component.

64. The kit of claim 1, further comprising a supply containing the sheet element assembly.

65. The kit of claim 64, wherein the supply device comprises a roller or a magazine.

66. The kit of claim 1, further comprising a food product package comprising the sheetlike element assembly, wherein the coating is present within the food product package.

67. An activated sheetlike element formed from the kit of any preceding claim by adding the alkaline component to the coating layer of the sheetlike element assembly, wherein the activated sheetlike element comprises the reaction product of the at least one oxygen scavenger and the base.

68. The activated sheetlike element of claim 67, wherein the basic component is added in an amount such that the base is added in an amount of at least 0.01 molar equivalents based on the molar amount of the oxygen scavenger.

69. The activated sheetlike element of claim 68, wherein the basic component is added in an amount such that the base is added in an amount of at least 0.02 molar equivalents based on the molar amount of the oxygen scavenger.

70. The activated sheetlike element of claim 69, wherein the basic component is added in an amount such that the base is added in an amount of at least 0.05 molar equivalents based on the molar amount of the oxygen scavenger.

71. The activated sheetlike element of claim 70, wherein the basic component is added in an amount such that the base is added in an amount of at least 0.1 molar equivalents based on the molar amount of the oxygen scavenger.

72. The activated sheetlike element according to claim 67, wherein the basic component is added in an amount of 10 to 70% by weight, based on the total weight of the coating layer.

73. The activated sheetlike element according to claim 72, wherein the basic component is added in an amount of 20 to 65% by weight, based on the total weight of the coating layer.

74. The activated sheetlike element according to claim 73, wherein the basic component is added in an amount of 35 to 60% by weight, based on the total weight of the coating layer.

75. A method of making a kit for improving the shelf life of food, the method comprising the steps of: a) providing a particulate filler comprising surface-reacted calcium carbonate in an amount of at least 50% by weight, based on the total amount of the particulate filler, The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + The reaction product of the ion donor, wherein the carbon dioxide is passed through H3O + The ion donor process is formed in situ and / or supplied from an external source, and The surface-reacted calcium carbonate has a specific surface area of ​​20-200 m2 measured by the BET method. 2 / g, b) providing at least one oxygen scavenger, the at least one oxygen scavenger being a compound having at least one benzene ring with at least two phenolic hydroxyl groups and at least one group R, wherein two of the at least two phenolic hydroxyl groups are located on the at least one benzene ring in an ortho or para position relative to each other, and wherein R is selected from the group consisting of a hydrogen atom, a hydroxyl group, an alkoxy group, an aryloxy group, an amino group, an alkyl group, an aryl group, and -YR 1 group, in which -Y is selected from a direct bond, a linear or branched alkylene group having 1 to 6 carbon atoms and -CH=CH- group, and -R 1 is an alkoxycarbonyl group, an aryloxycarboxyl group or a substantially completely deprotonated carboxyl group, c) providing a polymer binder, d) providing a substrate layer comprising one or more individual substrate layers or a food packaging comprising the substrate layer, e) mixing the oxygen scavenger of step b), the particulate filler of step a) and the polymeric binder of step c) in the order given therein to obtain a coating composition, f) applying the coating composition of step e) to the substrate layer of step d) to obtain a sheet-like element precursor, g) drying the sheet-like element precursor obtained in step f) to obtain a sheet-like element assembly, and h) providing a basic component comprising (i) a hydroxyl radical having a pK of 6 or less b value of alkali and (ii) water.

76. The method of claim 75, wherein the surface-reacted calcium carbonate has a specific surface area of ​​50 to 120 m2 as measured by the BET method. 2 / g.

77. The method of claim 75, wherein R is -YR 1 group.

78. The method of claim 77, wherein Y is a direct bond.

79. The method of claim 75, wherein the method further comprises the steps of: i) mixing the alkaline component of step h) with water to obtain an aqueous alkaline component comprising the base and water.

80. The method of claim 79, wherein the pH of the aqueous alkaline component is at least 8.

81. The method of claim 80, wherein the pH of the aqueous alkaline component is at least 10.

82. The method of claim 81, wherein the pH of the aqueous alkaline component is at least 11.

83. The method of claim 82, wherein the pH of the aqueous alkaline component is at least 12.

84. The method of claim 79, wherein the aqueous alkaline component comprises the base in an amount of 1 weight percent to 75 weight percent based on the total weight of the aqueous alkaline component.

85. The method of claim 84, wherein the aqueous alkaline component comprises the base in an amount of 5 weight percent to 60 weight percent based on the total weight of the aqueous alkaline component.

86. The method of claim 85, wherein the aqueous alkaline component comprises the base in an amount of 10 weight percent to 35 weight percent based on the total weight of the aqueous alkaline component.

87. A method of manufacturing a chip component assembly, the method comprising the steps of: a) providing a particulate filler comprising surface-reacted calcium carbonate in an amount of at least 50% by weight, based on the total amount of the particulate filler, The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + The reaction product of the ion donor, wherein the carbon dioxide is passed through H3O + The ion donor process is formed in situ and / or supplied from an external source, and The surface-reacted calcium carbonate has a specific surface area of ​​20-200 m2 measured by the BET method. 2 / g, b) providing at least one oxygen scavenger, the at least one oxygen scavenger being a compound having at least one benzene ring with at least two phenolic hydroxyl groups and at least one group R, wherein two of the at least two phenolic hydroxyl groups are located on the at least one benzene ring in an ortho or para position relative to each other, and wherein R is -YR 1 group, in which -Y is selected from a direct bond, a linear or branched alkylene group having 1 to 6 carbon atoms and -CH=CH- group, and -R 1 is a carboxyl group that is essentially completely deprotonated, c) providing a polymer binder, d) providing a substrate layer comprising one or more individual substrate layers or a food packaging comprising the substrate layer, e) mixing the oxygen scavenger of step b), the particulate filler of step a) and the polymeric binder of step c) in the order given therein to obtain a coating composition, f) applying the coating composition of step e) onto the substrate layer of step d) to obtain a sheet-like element precursor, and g) drying the sheet-like element precursor obtained in step f) to obtain a sheet-like element assembly, wherein step b) of providing the at least one oxygen scavenger comprises the following sub-steps: b1) providing at least one oxygen scavenger precursor, which is a compound having at least one benzene ring with at least two phenolic hydroxyl groups and at least one group R, wherein two of the at least two phenolic hydroxyl groups are located on the at least one benzene ring in an ortho- or para-position relative to each other, and wherein R is -YR 1 group, in which -Y is selected from a direct bond, a linear or branched alkylene group having 1 to 6 carbon atoms and -CH=CH- group, and -R 1 It is a carboxyl group, b2) providing a basic compound, and b3) reacting the carboxyl group of the oxygen scavenger precursor of step b1) with the basic compound of step b2) to obtain the oxygen scavenger.

88. The method of claim 87, wherein the surface-reacted calcium carbonate has a specific surface area of ​​50 to 120 m2 as measured by the BET method. 2 / g.

89. The method of claim 87, wherein Y is a direct bond.

90. The process of claim 87, wherein the basic compound of step b2) is selected from the group consisting of carbonate bases, hydroxide bases, bicarbonate bases, and mixtures thereof.

91. The process of claim 87, wherein the basic compound of step b2) is selected from the group consisting of sodium carbonate, sodium bicarbonate, sodium hydroxide, potassium carbonate, potassium bicarbonate, potassium hydroxide, calcium carbonate, calcium bicarbonate, calcium hydroxide, magnesium carbonate, magnesium bicarbonate, magnesium hydroxide, ammonia, and mixtures thereof.

92. The process of claim 91, wherein the basic compound of step b2) is calcium carbonate.

93. The method of claim 75 or 87, wherein the mixing step e) is performed in the presence of a solvent.

94. The method of claim 93, wherein the solvent is water.

95. The method of claim 75 or 87, wherein the applying step f) is carried out by means of roller coating, dip coating, grooved rod coating, curtain coating, hard blade coating, coating roller coating, fountain coating, spray coating, short dwell coating, slot die coating, curved blade coating, bevel blade coating, air knife coating, doctor rod coating, gravure coating, conventional or metered size press coating, spray application techniques, screen printing and / or wet overcoating.

96. The method of claim 95, wherein applying step f) is performed by roller coating.

97. The process of claim 75 or 87, wherein the drying step g) is carried out at a temperature of 50-150°C at ambient pressure or under reduced pressure.

98. The method of claim 97, wherein the drying step g) is performed by hot air drying, IR radiation drying or UV radiation drying.

99. A method for activating the nested sheetlike elements of any one of claims 1 to 66, comprising the steps of: j) mixing the alkaline component with water to obtain an aqueous alkaline component comprising the base and water, and k) applying the aqueous alkaline component to at least a portion of the surface of the coating layer.

100. The method of claim 99, wherein the basic component is added in an amount such that the base is added in an amount of at least 0.01 molar equivalents based on the molar amount of the oxygen scavenger.

101. The method of claim 100, wherein the basic component is added in an amount such that the base is added in an amount of at least 0.02 molar equivalents based on the molar amount of the oxygen scavenger.

102. The method of claim 101, wherein the basic component is added in an amount such that the base is added in an amount of at least 0.05 molar equivalents based on the molar amount of the oxygen scavenger.

103. The method of claim 102, wherein the basic component is added in an amount such that the base is added in an amount of at least 0.1 molar equivalents based on the molar amount of the oxygen scavenger.

104. The method of claim 99, wherein the basic component is added in an amount of 10 to 70 weight percent based on the total weight of the coating layer.

105. The method of claim 104, wherein the basic component is added in an amount of 20 to 65 wt% based on the total weight of the coating layer.

106. The method of claim 105, wherein the basic component is added in an amount of 35-60% by weight based on the total weight of the coating layer.

107. The method of claim 99, wherein applying step k) is performed by inkjet printing, spraying, coating and / or drop coating.

108. A supply comprising the activated sheet-like elements of any one of claims 67 to 74, wherein the supply protects the activated sheet-like elements from the effects of oxygen.

109. The supply device of claim 108, wherein the supply device comprises a roller, a stack, a magazine or a package.

110. The supply of claim 109, wherein the supply comprises a box.

111. Food packaging comprising the activated sheetlike element of any one of claims 67 to 74, wherein the coating layer is present within the food packaging.

112. The food package according to claim 111, wherein the food package contains a food or a food, wherein the food is selected from the group consisting of liquid and solid food.

113. A food package according to claim 112, wherein the food is an oxygen-sensitive food.

114. The food package according to claim 113, wherein the oxygen-sensitive food is selected from the group consisting of poultry, beef, pork, ham, sausage, dried meats, raw and processed fish, dairy products, nuts and oilseeds, vegetables, candy, and beverages.

115. The food package according to claim 113, wherein the oxygen-sensitive food is selected from the group consisting of raw and processed meats.

116. The food package according to claim 113, wherein the oxygen-sensitive food is selected from bakery products.

117. The food package according to claim 113, wherein the oxygen-sensitive food is selected from snack foods.

118. The food package according to claim 113, wherein the oxygen-sensitive food is selected from ready-to-eat foods.

119. The food package according to claim 114, wherein the oxygen-sensitive food is orange juice.

120. Use of a kit according to any one of claims 1 to 66 in food packaging.

121. Use of an activated sheetlike element according to any one of claims 67 to 74 in food packaging.

122. Use of a kit according to any one of claims 1 to 66 for extending the shelf life of food.

123. Use of an activated sheetlike element according to any one of claims 67 to 74 for extending the shelf life of foods.

124. A packaged food product comprising a food product and a food product packaging having an activated sheetlike element according to any one of claims 67 to 74, wherein a coating layer of the activated sheetlike element is present within the food product packaging.

125. A packaged food product according to claim 124, wherein the food product is selected from the group consisting of liquid and solid food products.

126. A packaged food product according to claim 125, wherein the food product is an oxygen sensitive food product.

127. A packaged food product according to claim 126, wherein the oxygen-sensitive food product is selected from the group consisting of poultry, beef, pork, ham, sausage, dried meats, raw and processed fish, dairy products, nuts and oilseeds, vegetables, confectionery, and beverages.

128. A packaged food product according to claim 127, wherein the oxygen-sensitive food product is orange juice.

129. A packaged food product according to claim 126, wherein the oxygen-sensitive food product is selected from the group consisting of raw and processed meats.

130. The packaged food product according to claim 126, wherein the oxygen-sensitive food product is selected from bakery products.

131. The packaged food product according to claim 126, wherein the oxygen-sensitive food product is selected from snack foods.

132. The packaged food product according to claim 126, wherein the oxygen-sensitive food product is selected from ready-to-eat foods.

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