Porous coating comprising mineral and oxygen scavenger for improved shelf life of food products

Abstract

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

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, an activated sheet-like element formed therefrom, the use of the foregoing, a method for making a kit for improving the shelf life and a method for making a sheet-like element assembly. Background Art

[0002] The presence of oxygen in food packaging can have a negative impact on the quality of various oxygen-sensitive foods. For example, the presence of oxygen in food packaging is typically associated with flavor loss in freshly baked products such as coffee and nuts, as well as in seasonings and condiments. In addition, oxygen can cause the degradation of vitamins such as vitamins A, C and E and the degradation of red colorants in berries, sauces and meat products. It also promotes the growth of potentially harmful aerobic bacteria, promotes the growth of molds in cheese, other dairy products and baked products, accelerates the browning of fruits and vegetables, and causes the rancidity of fats and oils. In fruit or vegetable juices such as orange juice, oxygen contributes to the degradation of vitamin C. Therefore, the presence of oxygen in food packaging is detrimental to the edibility, nutritional value, texture, aroma and color of food, which reduces consumer acceptance and food storage life. The food industry must also adapt to consumer demand for minimally processed foods that contain little or no additives or preservatives, but at the same time maintain an acceptable or even increased storage life. It represents an additional requirement that any technical solution provided for increasing the shelf life does not require a complex packaging system, that is, the shelf life extension means should be simply 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% by volume of CO2) is introduced into the food package. However, residual oxygen concentrations in the packaging atmosphere may remain as high as 5% by volume due to oxygen entrapment in the food matrix, oxygen permeation through the packaging material or insufficient sealing of the food package. The combined use of oxygen scavengers and MAP can provide the desired 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, pouches may accidentally break, thereby allowing the food to be destroyed 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 contained oxygen, which may impair its oxygen scavenging activity.

[0005] Oxygen scavenger carriers are known in the art. For example, EP1550506 A1 discloses an oxygen scavenger carrier based on activated carbon and calcium silicate. EP3192850 A1 and WO2017121675A1 relate to calcium carbonate-based carriers for oxygen scavenging compounds.

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

[0007] As an alternative, palladium-based oxygen scavengers have been proposed, however, such oxygen scavengers are expensive and can be deactivated by sulfur components, particularly present in meat products. In addition, the maximum acceptable amount of H2 within the package limits the label capacity of such scavengers. Sulfite-based oxygen scavengers may cause degradation of odor and food aroma, while aluminum-based oxygen scavengers can be easily deactivated. In addition, oxidizable polymers have been suggested 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 found that prior art polyphenol-based oxygen scavengers are deactivated by the presence of carbon dioxide, which makes them unsuitable for MAP applications. However, MAP is a very common technology, for example in meat packaging applications, where low residual amounts of oxygen are particularly desired in order to reduce discoloration and microbial contamination of food.

[0010] Unpublished patent application PCT / EP2022 / 051345 relates to a sheet-like element having a coating layer comprising an oxygen scavenger such as gallic acid, a binder and surface-reacted calcium carbonate. The sheet-like element is effective in scavenging oxygen after application of an aqueous alkaline component.

[0011] In view of the foregoing, there remains a need for food safe oxygen scavengers that overcome the above disadvantages and that are particularly compatible with low moisture food packaging and MAP. Summary of the invention

[0012] It is therefore an object of the present invention 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 in food packaging.

[0013] 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.

[0014] According to a first aspect of the present invention, there is provided a kit for improving the shelf life of food. The kit comprises

[0015] a) a chip component assembly having

[0016] a1) a coating layer, the coating layer comprising

[0017] i) a particulate filler in an amount of 25-70% by weight, based on the total dry weight of the coating layer,

[0018] The particulate filler comprises more than 50% by weight of a mineral, based on the total amount of the filler, the mineral being preferably an alkaline earth metal mineral, a silicate or a mixture thereof, wherein the mineral is not surface-reacted calcium carbonate, 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 + Ion donors are generated in situ and / or supplied from external sources.

[0019] ii) a polymeric binder in an amount of 5 to 25% by weight based on the total dry weight of the coating layer, and

[0020] 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,

[0021] 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,

[0022] 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

[0023] wherein R is selected from hydrogen, hydroxy, alkoxy, aryloxy, amino, alkyl, aryl and -YR 1 group, preferably, wherein R is -YR 1 Group, where

[0024] -Y is selected from a direct bond, a linear or branched alkylene group having 1 to 6 carbon atoms and

[0025] -CH=CH- group, preferably, Y is a direct bond, and

[0026] -R 1is an alkoxycarbonyl group, an aryloxycarboxyl group, a carboxyl group or a substantially completely deprotonated carboxyl group, and

[0027] a2) basal layer, and

[0028] b) a basic component comprising a b Value of base.

[0029] The inventors surprisingly found that the coating of the sheet-like element of the set according to the present invention provides a specific porous structure due to the interaction of the compounds contained. The particles of the particulate filler form a loose packing, which includes interparticle voids and maintains accessibility to the intraparticle voids (if present) of the particulate filler. Alkaline earth metal minerals, silicates and mixtures thereof have been found to be particularly desirable particulate fillers. However, the use of surface-reacted calcium carbonate as a mineral is not within the scope of the present invention. Therefore, the mineral is not surface-reacted calcium carbonate, and the surface-reacted calcium carbonate (if any) contained in the coating is less than 50% by weight based on the total dry weight of the coating. The oxygen scavenger is a polyphenolic compound that is capable of reacting with oxygen once activated. The oxygen scavenger is placed in the interparticle pores and intraparticle pores of the particulate filler. The amount of binder is selected so that the coating has sufficient adhesion and uniform distribution on the base layer, wherein the pores of the particulate filler remain accessible. The relative amount of this granular filler, this binding agent and this oxygen scavenger is selected so that this coating keeps porous structure.Therefore, be intended to mix with water to form this alkaline component that contains water and can be added in this sheet element and be deposited in its hole, thereby the oxygen scavenger of this sheet element is activated due to at least part of the deprotonation of phenolic hydroxyl group.Subsequently, the activated sheet element can be placed in the 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.

[0030] Additionally, the coating is physically separated from the food and does not contaminate the food, 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 at high temperatures in an extrusion step with the polymer mixture to incorporate it into the package, processing of the oxygen scavenger at high temperatures and keeping a portion of the oxygen scavenger inaccessible to oxygen are also avoided.

[0031] Furthermore, the inventors have found that the ability of the coating to accommodate large amounts of water from the aqueous alkaline component allows improved oxygen scavenging activity to be obtained even at low humidity levels. In addition, 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.

[0032] 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

[0033] - 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

[0034] 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.

[0035] 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.

[0036] A third aspect of the present invention relates to a method for manufacturing a set for improving the shelf life of food. The method comprises the following steps:

[0037] a) providing a particulate filler, the particulate filler comprising more than 50% by weight of a mineral, based on the total amount of the filler, the mineral preferably being an alkaline earth metal mineral, a silicate or a mixture thereof, wherein the mineral is not surface-reacted calcium carbonate, 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 + Ion donors are generated in situ and / or supplied from external sources.

[0038] 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, where

[0039] -Y is selected from a direct bond, a linear or branched alkylene group having 1 to 6 carbon atoms and

[0040] -CH=CH- group, preferably, Y is a direct bond, and

[0041] -R 1 is an alkoxycarbonyl group, an aryloxycarboxyl group, a carboxyl group or a substantially completely deprotonated carboxyl group,

[0042] c) providing a polymer binder,

[0043] d) providing a substrate layer comprising one or more individual substrate layers or a food packaging comprising the substrate layer,

[0044] 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,

[0045] f) applying the coating composition of step e) onto the substrate layer of step d) to obtain a sheet-like element precursor,

[0046] g) drying the sheet-like element precursor obtained in step f) to obtain a sheet-like element assembly,

[0047] h) providing a basic component comprising a b value of base, and optionally

[0048] i) mixing the alkaline component of step h) with water to obtain an aqueous alkaline component comprising the base and water, wherein preferably,

[0049] - 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

[0050] - 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.

[0051] In a fourth aspect of the present invention, a method for manufacturing a sheet-like component assembly is provided. The method comprises the following steps:

[0052] a) providing a particulate filler, the particulate filler comprising more than 50% by weight of a mineral, based on the total amount of the filler, the mineral preferably being an alkaline earth metal mineral, a silicate or a mixture thereof, wherein the mineral is not surface-reacted calcium carbonate, 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 + Ion donors are generated in situ and / or supplied from external sources.

[0053] 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, where

[0054] -Y is selected from a direct bond, a linear or branched alkylene group having 1 to 6 carbon atoms and

[0055] -CH=CH- group, preferably, Y is a direct bond, and

[0056] -R 1 is a carboxyl group that is essentially completely deprotonated,

[0057] c) providing a polymer binder,

[0058] d) providing a substrate layer comprising one or more individual substrate layers or a food packaging comprising the substrate layer,

[0059] 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,

[0060] f) applying the coating composition of step e) onto the substrate layer of step d) to obtain a sheet-like element precursor, and

[0061] g) drying the sheet-like element precursor obtained in step f) to obtain a sheet-like element assembly,

[0062] Wherein the step b) of providing the at least one oxygen scavenger comprises the following sub-steps:

[0063] 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, where

[0064] -Y is selected from a direct bond, a linear or branched alkylene group having 1 to 6 carbon atoms and

[0065] -CH=CH- group, preferably, Y is a direct bond, and

[0066] -R 1 It is a carboxyl group.

[0067] b2) providing a basic compound, and

[0068] 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.

[0069] The inventors have found that compounds having at least one benzene ring with at least two phenolic hydroxyl groups and at least one group R can be used as oxygen scavengers according to the invention. Advantageously, if such compounds contain carboxyl groups (-COOH), as is often the case with naturally occurring polyphenols, such carboxyl groups are converted into substantially completely deprotonated carboxyl groups by reaction with a basic compound before being incorporated into the sheetlike element assembly according to the invention. Interaction of the oxygen scavenger with the particulate filler and potential degradation of the particulate filler can thereby be minimized and / or avoided.

[0070] A fifth aspect of the present invention relates to a method for activating an assembly of sheet-like elements of the present invention of a set of the present invention. The method comprises the following steps:

[0071] j) mixing the alkaline component with water to obtain an aqueous alkaline component comprising the base and water, and

[0072] k) applying the aqueous alkaline component to at least a portion of the surface of the coating layer, wherein preferably,

[0073] - 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

[0074] - 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

[0075] - The applying step k) is performed by inkjet printing, spraying, coating and / or dripping.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] A ninth aspect of the present invention relates to the use of the kit according to the present invention and / or the activated sheetlike element according to the present invention for extending the shelf life of food products.

[0081] Advantageous embodiments of the invention are defined in the respective dependent claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0082] Figure 1 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

[0083] It should be understood that for the purposes of the present invention, the following terms have the following meanings.

[0084] The kit is "suitable for improving the shelf life of food" in the sense 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. Thus, 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.

[0085] "Improvement of food shelf life" is broadly understood as at least one of the properties of food in a food package (preferably texture, color, taste, nutritional value and / or edibility) being retained for a longer period of time than the same food in the same food package without the activated sheetlike element of the present invention. The terms "improving", "extending" or "increasing" food shelf life are used synonymously herein.

[0086] "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.

[0087] 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 ground natural calcium carbonate (GNCC) or precipitated calcium carbonate (PCC) treated with an ion donor, wherein the carbon dioxide is reacted with H3O +The ion donor is formed in situ and / or supplied from an external source. The surface-reacted calcium carbonate can be obtained as disclosed in patent application PCT / EP2022 / 051345, the content of which is incorporated herein by reference with respect to the production and properties of surface-reacted calcium carbonate. In the context of the present invention, H3O + The ion donor is a Bronsted acid and / or an acid salt. Further details about surface-reacted calcium carbonate are disclosed in WO0039222A1, WO2004083316 A1, WO2005121257A2, WO2009074492 A1, EP2264108A1, EP2264109A1 and US20040020410A1, the contents of which are hereby included in the present application.

[0088] "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.

[0089] "Precipitated calcium carbonate" (PCC) in the meaning of the present invention is a synthetic material, usually by precipitation in an aqueous environment after carbon dioxide reacts with calcium hydroxide or by calcium ions and carbonate ions (e.g., CaCl and NaCO) being precipitated out from solution and obtained. Other possible ways to produce PCC are the lime soda process, or the Solvay process, in which PCC is a by-product of ammonia production. Precipitated calcium carbonate exists in three primary crystal forms: calcite, aragonite and vaterite, and for each of these crystal forms, there are many different polymorphs (crystal habit). Calcite has a triangular structure, which has typical crystal habits such as scalenohedral (S-PCC), rhombohedral (R-PCC), hexagonal prism, axonal, colloidal (C-PCC), cubic and prismatic (P-PCC). Aragonite is an orthorhombic structure with a typical crystal habit of paired hexagonal prisms, as well as various classifications of elongated prisms, curved blades, steep cones, chisel-pointed crystals, branched trees, and coral or worm-like forms. Vaterite belongs to the hexagonal system. The obtained PCC slurry can be mechanically dehydrated and dried.

[0090] If not expressly stated otherwise, the "particle size" of the particulate filler and the mineral 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 20The (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, i.e. 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.

[0091] Volume median particle size d 50 The d was measured using a Malvern Mastersizer 3000 laser diffraction system. 50 or 98 The value indicates the diameter value at which 50% or 98% by 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.

[0092] If particle size is given herein as a weight-based particle size, then for example d 20 The (wt) value refers to the particle size below which 20% by weight of all particles are smaller than. 50 The (wt) value is thus the weight median particle size, i.e. 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. 98 The (wt) value refers to the particle size below which 98% by weight of all particles are smaller than that particle size.

[0093] Weight basis median particle size d 50 (wt) and top cut d 98 (wt) was measured by sedimentation method, which is the analysis of sedimentation behavior in a gravitational field. A Sedigraph from Micromeritics Instrument Corporation, USA TM The measurement was performed at 5120. The method and the instrument are known to the person skilled in the art and are commonly used for determining the particle size distribution. The measurement was performed in an aqueous solution of 0.1 wt% Na4P2O7. The sample was dispersed using a high-speed stirrer and ultrasonic treatment.

[0094] "Porosity" or "pore volume" when used in connection with the particulate filler and the mineral refers to the intra-particle intrusive specific pore volume. The term "porosity" or "pore volume" when used in connection with 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), such as in powders or compacts or coatings, and / or the void spaces within porous particles (intra-particle pores), which, when saturated with liquid, allow the passage of liquid under pressure and / or support the absorption of surface wetting liquids.

[0095] Throughout this document, the term "specific surface area" (in m2) is used to define the particulate filler, mineral or other material. 2 The surface area is expressed in terms of % by mass and % by weight. SSA refers to the specific surface area determined by using the BET method (using nitrogen as the adsorption gas) according to ISO 9277:2010.

[0096] 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 to reduce 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, which contains an oxygen scavenger in either or both of an inactive and activated form. For example, the sheet element assembly and the activated sheet 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, which reduces its amount in the surrounding atmosphere.

[0097] When reference is made hereinafter to a "sheet-like element", it is to be understood that the term encompasses both the kitted sheet-like element assembly and the activated sheet-like element.

[0098] "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, about room temperature or 5±1°C).

[0099] When the term "comprising" is used in this specification and claims, it does not exclude other non-specified elements of major or minor functional importance. For the purposes of the present invention, the term "consisting of" is considered to be a preferred embodiment of the term "comprising". If a group is defined below to include at least a certain number of embodiments, this is also understood to disclose a group that preferably consists of these embodiments only.

[0100] Wherever the terms "including" or "having" are used, these terms are considered equivalent to "comprising" as defined above.

[0101] 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.

[0102] 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.

[0103] When reference is made above or below to preferred embodiments or technical details of the kit according to the invention, it should 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).

[0104] mineral

[0105] 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 involve the use of minerals other than surface-reacted calcium carbonate.

[0106] For the purposes of the present invention, the term "mineral" is understood to mean an essentially insoluble inorganic compound, preferably of natural origin. The term "essentially insoluble" refers to a compound whose solubility product constant K in water at 25°C is sp Up to 1x 10 -4 , preferably at most 1x 10 -5 , most preferably at most 1x 10 -6 .

[0107] Minerals suitable for use in the present invention include alkaline earth metal minerals, silicates, sulfides, metal oxides, silicon dioxide, diatomaceous earth and mixtures thereof. However, the mineral is not surface-reacted calcium carbonate, 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 process is formed in situ and / or supplied from an external source.

[0108] In a preferred embodiment of the present invention, the mineral is not calcium carbonate other than ground natural calcium carbonate and precipitated calcium carbonate, more preferably, the mineral is not calcium carbonate other than ground natural calcium carbonate.

[0109] In a preferred embodiment, the mineral is selected from the group consisting of alkaline earth minerals, silicates, and mixtures thereof.

[0110] For the purposes of the present invention, "alkaline earth metal mineral" is understood to mean a substantially insoluble compound comprising at least one type of alkaline earth metal cation. These alkaline earth metals may be beryllium, magnesium, calcium, strontium or barium.

[0111] Preferably, the alkaline earth metal mineral is selected from alkaline earth metal carbonates, alkaline earth metal phosphates, alkaline earth metal sulfates, alkaline earth metal oxides, alkaline earth metal hydroxides and mixtures thereof, more preferably, the alkaline earth metal mineral is selected from calcium and / or magnesium carbonates, phosphates, sulfates, oxides, hydroxides and mixtures thereof, even more preferably, the alkaline earth metal mineral is selected from calcium carbonate, magnesium carbonate and mixtures thereof, and most preferably, the alkaline earth metal mineral is selected from precipitated hydromagnesite, ground natural calcium carbonate and precipitated calcium carbonate.

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

[0113] 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.

[0114] Hydromagnesite or basic magnesium carbonate (which is the standard industry name for hydromagnesite) is a naturally occurring mineral found in magnesium-rich minerals such as serpentine and altered magnesium-rich igneous rocks, but also as an alteration product of brucite in periclase marble. Hydromagnesite is described as having the following formula: Mg5(CO3)4(OH)2·4H2O.

[0115] It should be understood that hydromagnesite is a very specific mineral form of magnesium carbonate and occurs naturally as small needle-like crystals or needle-like shells or blade-like crystals. In addition, it should be noted that hydromagnesite is a different and unique form of magnesium carbonate and is chemically, physically and structurally different from other forms of magnesium carbonate. Hydromagnesite can be easily distinguished from other magnesium carbonates by X-ray diffraction analysis, thermogravimetric analysis or elemental analysis. Unless specifically stated as hydromagnesite, all other forms of magnesium carbonate (e.g. hydromagnesite (Mg2(CO3)(OH)2·3H2O), fulgurite (Mg5(CO3)4(OH)2·5H2O), isohydromagnesite (Mg5(CO3)4(OH)2·5H2O), malachite (Mg2(CO3)(OH)2·0.5H2O), magnesite (MgCO3), hydromagnesite (MgCO3·2H2O), halloysite (MgCO3·5H2O) and nesquehonite (MgCO3·3H2O)) are not hydromagnesite within the meaning of the present invention and do not chemically correspond to the above formula.

[0116] In addition to natural hydromagnesite, synthetic hydromagnesite (or precipitated magnesium carbonate) can be prepared. For example, US1361324, US935418, GB548197 and GB544907 generally describe the formation of an aqueous solution of magnesium bicarbonate (typically described as "Mg(HCO3)2"), which is then converted to form hydromagnesite by the action of an alkali (e.g., magnesium hydroxide). Other methods described in the art suggest the preparation of a composition containing hydromagnesite and magnesium hydroxide, wherein the magnesium hydroxide is mixed with water to form a suspension, which is further contacted with carbon dioxide and an alkaline aqueous solution to form a corresponding mixture; see, for example, US5979461.

[0117] Precipitated hydromagnesite can be prepared according to the methods disclosed in applications WO2011054831 A1, PCT / EP2021 / 087807 or EP 21 193840.2, which are incorporated herein by reference with regard to the methods for producing precipitated hydromagnesite.

[0118] It should be understood that the hydromagnesite can be a type of hydromagnesite or a mixture of different types of hydromagnesite. In one embodiment of the present invention, the hydromagnesite comprises one type of hydromagnesite, preferably consisting of one type of hydromagnesite. Alternatively, the hydromagnesite comprises two or more types of hydromagnesite, preferably consisting of two or more types of hydromagnesite. For example, the hydromagnesite comprises two or three types of hydromagnesite, preferably consisting of two or three types of hydromagnesite. Preferably, the hydromagnesite comprises one type of hydromagnesite, preferably consisting of one type of hydromagnesite.

[0119] For the purposes of the present invention, "silicate" is understood to mean any mineral containing orthosilicate, pyrosilicate, cyclosilicate, inosilicate or phyllosilicate moieties, or is an aluminosilicate framework silicate. It should be understood that compounds having the general formula SiO2, such as silicon dioxide, pyrogenic silicon dioxide and quartz, are not considered "silicates" for the purposes of the present invention.

[0120] In a preferred embodiment, the silicate is selected from aluminosilicates, alkaline earth metal-containing silicates and mixtures thereof. For example, the silicate can be selected from mica, serpentine, clay, feldspar (such as nepheline syenite), feldspar-like, scapolite, hornblende, pyroxene, pyroxene-like (such as wollastonite), zeolite and mixtures thereof.

[0121] In a particularly preferred embodiment, the silicate is selected from the group consisting of zeolites, perlite, kaolin, bentonite, calcined clay, and mixtures thereof.

[0122] In a preferred embodiment of the present invention, the mineral 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.

[0123] It is also preferred that the mineral 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.)

[0124] Furthermore, it may be preferred that the mineral 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.

[0125] Preferably, the mineral has a mercury porosimetry measurement between 0.1 and 2.5 cm3 / 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 intrusive specific pore volume.

[0126] The internal pore size of the particles of the mineral is preferably 0.004-1.6 μm, more preferably 0.005-1.3 μm, particularly preferably 0.006-1.15 μm, and most preferably 0.007-1.0 μm, as determined by mercury porosimetry measurements.

[0127] 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, PAC, Kettle, JP, Matthews, GP, and Ridgway, CJ, "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).

[0128] The total pore volume seen in the cumulative intrusion data can be divided into two regions, where 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 the specific intra-particle pore volume is defined by taking the specific pore volume of the pores that are finer than the peak inflection point (i.e., finer than the bimodal inflection point) intruded by mercury. 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.

[0129] 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 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 interagglomerate pore volumes 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 separate any other pore size regions of interest.

[0130] In an exemplary embodiment, the mineral is precipitated hydromagnesite having a BET 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.

[0131] In a particularly preferred embodiment of the present invention, the mineral is precipitated hydromagnesite, wherein the precipitated hydromagnesite 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.

[0132] It should be understood that the mineral as described herein forms inter-particle pores and coarse agglomerate pores when incorporated into the coating of the present invention, which can accommodate a suitable large amount of oxygen scavengers. The intra-particle pores (if present) remain accessible and can also accommodate oxygen scavengers. In addition, a portion of the above-mentioned pores remain accessible to the aqueous alkaline composition, so that the sheet-like element can be easily activated by applying the aqueous alkaline composition in sufficient amount.

[0133] Granular filler

[0134] The kit of the invention, the activated sheetlike element of the invention, the method of the invention, the supply device of the invention, the food packaging of the invention and the use of the invention make use of a particulate filler. The particulate filler comprises the mineral in an amount of more than 50% by weight, based on the total amount of the particulate filler. The mineral is as defined above and is most preferably selected from precipitated hydromagnesite, ground natural calcium carbonate and precipitated calcium carbonate as described above.

[0135] The presence of the mineral in the particulate filler in an amount greater than 50% by weight based on the total amount of the particulate filler means that the mineral is preferably present in an amount of at least 51% by weight, more preferably at least 55% by weight, most preferably at least 60% by weight based on the total amount of the particulate filler.

[0136] In a preferred embodiment of the present invention, the particulate filler comprises the mineral 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 mineral.

[0137] Thus, the particulate filler may comprise less than 50% by weight, preferably at most 30% by weight, more preferably at most 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 50 It 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.

[0138] In another embodiment of the present invention, the granular filler comprises a mineral in an amount greater than 50% by weight based on the total amount of the granular filler, and comprises at least one additional granular filler material 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. Preferably, the at least one additional granular filler material is selected from ground calcium carbonate, precipitated calcium carbonate and mixtures thereof. In the embodiment described, it is particularly preferred that the granular filler consists of the at least one additional granular filler material and the mineral. Therefore, the granular filler is preferably composed of the mineral and the at least one additional granular filler material in an amount greater than 50% by weight, preferably at least 70% by weight, more preferably at least 90% by weight, based on the total amount of the granular filler, and the at least one additional granular filler material is selected from ground calcium carbonate, precipitated calcium carbonate and mixtures thereof. It should be understood that the mineral and the at least one additional granular filler material can be the same or different materials.

[0139] According to one embodiment of the present invention, the ground calcium carbonate or precipitated calcium carbonate is a weight median particle size d 50 In the form of particles having a particle 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 particle size d based on weight. 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.

[0140] In a preferred embodiment of the present invention, the particulate filler comprises a mineral in an amount of more than 50% by weight, based on the total amount of the particulate filler, which mineral is precipitated hydromagnesite, ground natural calcium carbonate, precipitated calcium carbonate or a mixture thereof, and comprises at least one additional particulate filler material 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. Preferably, the at least one additional particulate filler material is selected from ground calcium carbonate, precipitated calcium carbonate and mixtures thereof. In this embodiment, it is particularly preferred that the particulate filler consists of the at least one additional particulate filler material and the mineral. Therefore, the particulate filler preferably consists of the mineral, which is precipitated hydromagnesite, ground natural calcium carbonate, precipitated calcium carbonate or a mixture thereof, and the at least one additional particulate filler material, in an amount of more than 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, and the at least one additional particulate filler material selected from ground calcium carbonate, precipitated calcium carbonate and a mixture thereof.

[0141] Polymer Binder

[0142] 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 make use of a polymer binder.

[0143] Any suitable polymer binder can be used in the coating layer 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 mineral particles (if present) are not blocked and remain accessible to the oxygen scavenger and the aqueous alkaline component.

[0144] 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 that can be used in combination with a prepolymer or a prepolymer of a prepolymer or a prepolymer. The binders include but are not limited to 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 such as 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, and the like 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-dilutable alkyd resins, acrylic / alkyd resin combinations, natural oils such as linseed oil, and mixtures thereof.

[0145] 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 containing 50% by weight of an alkali swellable binder based on the total weight of the aqueous solution and having a pH of 4, if the pH value of the aqueous solution is increased from 4 to 10, when measured by a Brookfield DVIII Ultra viscometer at 24°C ± 3°C at 100 rpm using a suitable spindle of the Brookfield RV-spindle set, its viscosity increases by at least 100%, preferably at least 250%, more preferably at least 500%, and most preferably at least 750%. A preferred alkali swellable binder is a polyacrylic acid or a salt thereof or a derivative thereof.

[0146] 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.

[0147] The polymer 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.

[0148] The polymer binder is added in order to obtain a coating layer that can be evenly distributed on the substrate layer and adhere to the substrate layer. The amount of the polymer binder added is selected to be high enough to allow the layer to have sufficient cohesion and adhesion, but also low enough not to block or clog the intra-particle pores and inter-particle pores of the mineral. In order to further improve adhesion, a primer layer can be provided between the substrate layer and the coating layer, as will be described below.

[0149] In addition, the binding agent allows the coating of any aspect of the present invention to be fixed to the substrate, for example, by a coating process. Therefore, the binding agent is selected so that the coating does not delaminate during, for example, storage, loading of aqueous alkaline components and / or use of sheet elements or food packaging.

[0150] 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 its salt or 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.

[0151] Oxygen scavengers

[0152] The kit according to the invention, the activated sheet-like 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 make use of 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,

[0153] 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

[0154] wherein R is selected from hydrogen, hydroxy, alkoxy, aryloxy, amino, alkyl, aryl and -YR 1 Group.

[0155] -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

[0156] -R 1 is an alkoxycarbonyl group, an aryloxycarboxyl group, a carboxyl group or a substantially completely deprotonated carboxyl group. 1 The carboxyl group is essentially completely deprotonated.

[0157] In a particularly preferred embodiment, R is -YR as defined above 1 Group.

[0158] The "phenolic hydroxyl group" refers to a hydroxyl group (-OH) directly bonded to an aromatic ring.

[0159] For the purposes of the present invention, two substituents arranged on the benzene ring in an "ortho manner" means that the two substituents are attached to the benzene ring in a 1,2 manner relative to each other. Similarly, two substituents arranged on the benzene ring in a "para manner" means that the two substituents are attached to the benzene ring in a 1,4 manner. The relative position of the phenolic hydroxyl groups ensures that the oxygen scavenger is easily oxidized because a quinoid system can be formed.

[0160] The -CH=CH- group may be in a cis or trans arrangement or a mixture thereof and is preferably in a trans arrangement.

[0161] 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.

[0162] Alkyl in 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.

[0163] 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.

[0164] "Organic radical" in the meaning of the present invention is any organic substituent having one free valence at a carbon atom, regardless of the functional type, for example CH3CH2-, ClCH2-, CH3C(=O)-, 4-pyridylmethyl- (see IUPAC Gold Book, https: / / doi.org / 10.1351 / goldbook.O04329).

[0165] "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.

[0166] "Alkoxycarbonyl" refers to the group -C(=O)-OR 2 , where R 2 represents an alkyl group, and 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.

[0167] "Aryloxycarbonyl" refers to the group -C(=O)-OR 3 , where R 3 represents an aryl group, preferably a phenyl group.

[0168] "Carboxy" refers to the group -C(=O)-OH.

[0169] A "substantially completely 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 counterions, for example as a result of reaction with a base. The term "substantially completely substituted" or "substantially completely 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. The substantially completely deprotonated carboxyl group can be written as -C(=O)-O(H / M), wherein M represents the counterion.

[0170] 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.

[0171] For the purposes of the present invention, ammonium ions are selected from NH4 + , primary ammonium ions, secondary ammonium ions, tertiary ammonium ions and quaternary ammonium ions, preferably NH4 + .

[0172] 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):

[0173] in

[0174] A 1 , 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.

[0175] Halide groups within the meaning of the present invention are fluoride, chloride, bromide and iodide.

[0176] A cyclic ring is understood to mean a new ring formed by two adjacent residues, which shares 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-.

[0177] 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, with the proviso that A 1 To A 4 At least one of is R as defined above. The alkyl group is preferably a methyl group, and the alkoxy group is preferably a methoxy group.

[0178] In the case where the oxygen scavenger comprises a carboxyl group, such a carboxyl group may react with an alkaline mineral such as a carbonate. In such an embodiment, a substantially completely deprotonated product may be formed. Thus, in the case where the mineral is capable of reacting with a carboxylic acid group, such as in the case of calcium carbonate, R is particularly preferred. 1 In other words, preferably, the carboxylic acid groups are deprotonated prior to forming the coating of the present invention, for example by the method described below.

[0179] In a preferred embodiment, the at least one oxygen scavenger is selected from phenolic acids with at least two phenolic hydroxyl groups arranged ortho or para to each other, cinnamic acid with at least two phenolic hydroxyl groups arranged ortho or para to each other, derivatives thereof, and mixtures thereof.

[0180] 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 comprises the 3-phenylprop-2-enoic acid scaffold.

[0181] Thus, a "phenolic acid 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 1A group in which Y is a direct bond and R 1 It is an alkoxycarbonyl group, an aryloxycarboxyl group, a carboxyl group or a substantially completely deprotonated carboxyl group.

[0182] Similarly, "cinnamic acid with 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 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 in ortho or para position relative to each other on the at least one benzene ring, and wherein R is -YR 1 A group in which Y is a -CH=CH- group and R 1 It is an alkoxycarbonyl group, an aryloxycarboxyl group, a carboxyl group or a substantially completely deprotonated carboxyl group.

[0183] In a preferred embodiment, the at least one oxygen scavenger is selected from gallic acid (3,4,5-trihydroxybenzoic acid), digallic acid (3,4-dihydroxy-5-[(3,4,5-trihydroxybenzoyl)oxy]benzoic acid), protocatechuic acid (3,4-dihydroxybenzoic acid), caffeic acid (3-(3,4-dihydroxyphenyl)-2-propenoic acid), 5-hydroxyferulic acid (3-(3,4-dihydroxy-5-methoxyphenyl)prop-2-enoic acid), gentisic acid (2,5-dihydroxy

[0013] The invention discloses a kind of benzoic acid comprising: a benzoic acid, ...

[0184] 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 (2, derivatives, and mixtures thereof.

[0185] The term "acid derivative" in this context means that the at least one oxygen scavenger comprises an alkoxycarbonyl, aryloxycarboxyl or substantially completely deprotonated carboxyl group of the above-mentioned acid, i.e. the acid derivative is selected from the group consisting of alkyl esters, aryl esters and substantially completely deprotonated acids of the corresponding acids.

[0186] 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.

[0187] 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.

[0188] Basal layer

[0189] 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 make use of a substrate layer.

[0190] Coating of the present invention is fixed on the substrate, for example, by applying step described below.Coating of the present invention is fixed, so that this coating is not delaminating during for example storage, loading water-containing 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.

[0191] The substrate layer comprises one or more single substrate layers, that is, the substrate layer may have a single layer or a multilayer structure. If the substrate layer comprises two or more single substrate layers, these single substrate layers may be made of the same or different materials. There is no restriction on the thickness of the substrate layer and / or the single substrate layer. For example, the substrate layer may have a thickness of 1 μm-10 mm, preferably 10 μm-1 mm, more preferably 20 μm-0.5 mm, for example 50-150 μm. For example, the single substrate layer may have a thickness of 1 μm-10 mm, preferably 10 μm-1 mm, more preferably 20 μm-0.5 mm, for example 50-150 μm.

[0192] 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 21 CFR Part 177.

[0193] 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 paperboard layer; a textile layer; a nonwoven layer; a layer made of a bio-based material; 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.

[0194] In a particularly preferred embodiment of the present invention, the one or more individual substrate layers are layers of polymeric material. The layer of polymeric material 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.

[0195] 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.

[0196] In another embodiment of the present invention, the one or more single substrate layers are fibrous material layers. The fibrous material layer can be a fabric layer, a textile layer or a cloth layer, which is formed by filaments, yarns, threads or staple fibers, for example by weaving, knitting, braiding, crocheting, knotting or felting. For example, a single substrate layer can be a nonwoven layer. The production of nonwoven fabrics involves web forming steps, such as dry web forming, air web forming, wet web forming, spun web forming, melt blowing and submicron spinning; and web bonding steps, such as calendering, air-through bonding, needle punching, spunlace, stitching and chemical bonding; and optional finishing treatments, such as embossing, stretching, perforating, curling or coating.

[0197] 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.

[0198] In yet another embodiment of the present invention, the one or more single substrate layers are paper or paperboard layers. The paper or paperboard layers contain cellulose fibers, such as formed from wood pulp, and may further contain additives, such as those specified in the Code of Federal Regulations. Those listed under Part 176 of Title 21 of the Federal Regulations (CFR).

[0199] In yet another embodiment, the one or more individual substrate layers are layers made of bio-based materials. For purposes of the present invention, the term "bio-based" material is defined according to 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, biomass may have been subjected to physical, chemical or biological treatments. Therefore, suitable layers include wood layers, bamboo layers, paper layers, cardboard layers, and layers made of biopolymers such as polylactic acid, polybutylene succinate or polyhydroxybutyrate.

[0200] 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.

[0201] 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 contain inorganic pigments such as calcium carbonate or kaolin, and contain a binder, such as a polymer binder as described above. Optionally, the print receptive coating layer may contain 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 patterns, logos, texts or other information, such as by offset printing or inkjet printing. Preferably, the ink receptive coating layer is located on the sheet element on the opposite side of the coating layer.

[0202] The substrate can be coated evenly with the coating of the invention. Thus, optimal adhesion of the coating to the substrate 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. In addition, the substrate allows "additional functions" of the sheet element, such as accommodating additional printed information, accommodating an adhesive layer for reversibly or irreversibly fixing the sheet element in the food packaging, or accommodating a deterioration indication label.

[0203] Coating

[0204] 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 make use of a coating layer.

[0205] The coating layer comprises a particulate filler in an amount of 25-70% by weight based on the total dry weight of the coating layer, a polymer binder in an amount of 5-25% by weight based on the total dry weight of the coating layer, and at least one oxygen scavenger in an amount of 25-70% by weight based on the total dry weight of the coating layer. The particulate filler comprises a mineral in an amount greater than 50% by weight based on the total amount of the particulate filler.

[0206] It is to be understood that the mineral, the surface-reacted calcium carbonate, the at least one oxygen scavenger and the polymeric binder are described above.

[0207] 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.

[0208] In addition, the coating may include additional additives, such as rheology modifiers, viscosity enhancers, wetting agents, waxes, antistatic agents and / or defoamers. Suitable viscosity modifiers include thickeners. The viscosity modifier may be a linear polymer, a branched polymer, a comb polymer or a mixture thereof. Preferably, the comb polymer is selected from those described in US20060106186 A1, which is incorporated herein by reference.

[0209] In one embodiment of the present invention, the viscosity improver 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 flour, 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, other 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.

[0210] In a preferred embodiment of the present invention, the viscosity improver 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.

[0211] 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.

[0212] In a preferred embodiment of the present invention, the coating layer comprises a dispersant.

[0213] 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 The molecular weight M is 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 parting 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. The combination of sodium and magnesium is particularly preferred.

[0214] 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 monomers or polymer additives, such as ethylene-acrylic acid copolymers, can also be used alone or in combination. 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, in particular 1:5. Dispersants based on organometallic compounds can also be used. However, any other dispersant can also be used.

[0215] In a preferred embodiment of the present invention, the dispersant is selected from polyacrylic acid, its salt, its derivative, starch, carboxymethyl cellulose or mixtures thereof with a molecular weight of 1000-15000 g / mol. More preferably, the dispersant is polyacrylic acid partially or completely neutralized by alkali metal ions such as lithium, sodium, potassium, cesium and mixtures thereof (preferably sodium) and with a molecular weight of 1500-6000 g / mol.

[0216] 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%, most preferably at least 99 mol% of the hydrogen atoms of the carboxyl groups of the polyacrylic acid are replaced by alkali metal ions.

[0217] Most preferably, the dispersant is polyacrylic acid partially or fully neutralized with sodium ions and having a molecular weight of 1500-6000 g / mol.

[0218] The coating layer may contain the dispersant in an amount of 0.1 to 10% by weight, preferably 0.5 to 7% by weight, more preferably 1.0 to 4% by weight, based on the total dry weight of the coating layer.

[0219] The dispersant may be included in the coating layer to improve uniform dispersion of the particulate filler comprising the mineral throughout the coating layer and to reduce the amount of aggregates of the particulate filler comprising the mineral. At the same time, the specified amount may help maintain the intra-particle pores (if present) of the mineral (e.g., precipitated hydromagnesite) and the inter-particle pores formed by the mineral to a large extent accessible to oxygen scavengers and aqueous alkaline components. In a preferred embodiment of the present invention, the dispersant is selected from polyacrylic acid, its salts, its derivatives, 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 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.

[0220] It should be 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% by weight based on the total dry weight of the coating layer. Therefore, 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% by weight based on the total dry weight of the coating layer.

[0221] The coating is suitable for absorbing oxygen and absorbing alkaline components. Therefore, preferably, the coating 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 is represented by the total intrusive specific pore volume measured by mercury intrusion porosimetry.

[0222] Therefore, the coating layer of the present invention preferably has a total intrusive specific pore volume of 0.1 to 2 cm 3 In a preferred embodiment, the total intrusive specific pore volume measured by mercury intrusion porosimetry is 0.1-1.0 cm 3 / g, preferably 0.15-0.5cm 3 / g.

[0223] In a preferred embodiment, the coating has

[0224] - Total intra-particle intrusive specific pore volume of 0.05-1.0 cm-1 as measured by mercury intrusion porosimetry 3 / g, preferably 0.08-0.5cm 3 / g and more preferably 0.1-0.4cm 3 / g,

[0225] - 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 0.1-0.3cm 3 / g,

[0226] - Total occluded intrusive specific pore volume of 0.05-0.4 cm measured by mercury intrusion porosimetry 3 / g, preferably 0.08-0.3cm 3 / g and more preferably 0.1-0.2cm 3 / g.

[0227] The total intrusion specific pore volume, the total inter-particle intrusion specific pore volume and the total occluded intrusion specific pore volume are determined as described in CJ Ridgway, PAC Gane 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 on an impermeable substrate such as aluminum foil or PET film and characterized in an equivalent Laplace diameter ranging from 208 μm to 0.004 μm using a Micromeritics Au-topore V mercury porosimeter. The specific pore volume is given relative to the weight of the coating (excluding the impermeable substrate).

[0228] The total pore volume seen in the cumulative intrusion data can be divided into two regions, where the intrusion data from 214 μm down to about 10 μm shows a rolling process and 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 inter-particle pore volume of the coating. If the particles also have intra-particle pores, this region appears bimodal, and the specific intra-particle 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) intruded by mercury. The sum of these three regions gives the overall total pore volume of the coated sample.

[0229] 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 inter-particle pore region, and the intra-particle pore region (if present). Knowing the intra-particle pore diameter range, the remaining inter-particle 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.

[0230] Coating of the present invention has high fluid acceptance.In a preferred embodiment, this coating has the fluid acceptance of 1-150% weight, more preferably 10-125% weight, most preferably 15-100% weight.For example, this coating has the fluid acceptance of 1-50% weight, more preferably 10-45% weight, most preferably 15-35% weight.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.

[0231] 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 fluid or causing the coating to delaminate. The fluid receptivity is determined visually. The fluid receptivity is expressed in % weight and refers to the weight of the fluid per unit weight of the coating. Preferably, the fluid is water or a 1M K2CO3 aqueous solution.

[0232] The particulate filler comprising a mineral (e.g., precipitated hydromagnesite) is present in the coating layer to provide a high porosity of the coating layer. It is believed that the intra-particle pores, inter-particle pores, and coarse agglomerate pores of the particulate filler (particularly precipitated hydromagnesite), if present, are partially filled with oxygen scavengers and partially retained in the coating layer, thereby allowing high absorption of the aqueous alkaline component.

[0233] The polymer binder is added in order to obtain a coating layer that can be evenly distributed on the substrate layer and adhered 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 also low enough not to block or clog the pores of the mineral (e.g., precipitated hydromagnesite). In a preferred embodiment, the coating layer comprises a 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.

[0234] Kits for improving the shelf life of food

[0235] 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.

[0236] Chip component assembly

[0237] The sheet-like element comprises a coating layer and a base layer. The base layer and the coating layer are described above.

[0238] 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 adjust the composition of this coating to allow the effective adhesion of this coating and selected substrate.Depending on the substrate used, this sheet element can be flexible (i.e. it can be bent without the delamination of coating) or rigid.This substrate allows to obtain an evenly distributed coating.Therefore, no matter the material of food packaging, the best adhesion of this coating and this substrate can be achieved.In addition, this substrate allows the " additional function " of this sheet element.

[0239] 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 a process described below, preferably by a roller coating step.

[0240] In another embodiment of the present invention, this sheet element also comprises one or more adhesive layers, and this adhesive layer is positioned at this substrate on the opposite side of this coating and / or between single substrate layers, and wherein this adhesive layer is preferably selected from adhesive, 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 packaging, or is used for temporarily fixing this sheet element on the sheet element supply device, as described below.But, in the situation that there is no adhesive layer, this sheet element can be simply placed in the food packaging loosely.If this adhesive layer is present between single substrate layers, then this adhesive layer allows to realize the adhesion of the improvement of single substrate layers, thereby improves the life-span and the durability of this sheet element.

[0241] Suitable materials for the adhesive layer are known to those skilled in the art and include those listed under Section 175.105 of Title 21 of the Code of Federal Regulations (CFR). Specific examples include polyethyleneimines, polyurethanes, polyacrylates, and starches. Suitable materials for the pressure-sensitive layer include those listed under Section 175.125 of Title 21 of the CFR.

[0242] In another embodiment of the present invention, this sheet-like element also comprises one or more primers between this substrate and this coating.This primer can be selected from any suitable material well known to those skilled in the art, and is preferably selected from polyurethane, ethylene-vinyl acetate, polyvinyl chloride, nitrocellulose, acrylate, ethylene-acrylate, polyacrylonitrile (acrylic acid system) and mixtures thereof.More preferably, this primer is formed by the aqueous dispersion comprising 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 the life-span and the durability of this sheet-like element.

[0243] In a preferred embodiment of the invention, the sheetlike element further comprises one or more oxygen-permeable cover layers to permanently cover the coating layer.The term "oxygen-permeable" cover layer in the meaning of the present invention refers to a cover layer which allows oxygen to pass through, for example due to the presence of micropores.

[0244] The oxygen permeable cover allows oxygen to penetrate substantially unimpeded from the atmosphere of the food to the coating, but prevents the coating and the food from being in direct contact with each other. Therefore, preferably, the breathable cover is selected from a breathable film layer, a fiber material layer and a nonwoven fabric layer. The breathable film layer can be made of materials such as polyethylene, polypropylene or polyethylene terephthalate. Suitable breathable film layers include those disclosed in WO 2016 / 023937A1. Suitable fiber material layers and nonwoven fabric layers used as breathable cover layers include those described above in the context of the substrate layer.

[0245] In a preferred embodiment, the oxygen permeable cover layer simultaneously prevents moisture or water vapor from passing through, so that water that has been added in the form of an aqueous alkaline component does not evaporate from the coating layer. Thus, the oxygen scavenging activity of the activated sheet element can be further improved in a low humidity environment (e.g., below 50% rH). An exemplary oxygen permeable but moisture impermeable coating is an LDPE film. This layer may or may not be removed from the sheet element assembly for application of the aqueous alkaline component. In a preferred embodiment, the sheet element assembly can be activated by applying the aqueous alkaline component while the cover layer is still present. In this embodiment, the cover layer can be left on the activated sheet element during use. Alternatively, the oxygen permeable cover layer can be added to the activated sheet element (i.e., after applying the aqueous alkaline component).

[0246] In another embodiment of the present invention, this sheet element also comprises one or more protective layers with this coating layer and / or this adhesive layer of temporary sealing, and wherein this protective layer is preferably selected from polyethylene, polypropylene and / or coated paper.This protective layer protects this coating layer from environmental influences, for example, avoids being polluted by dirt or grease, until this sheet element assembly is used, promptly activated by this alkaline component and is placed in food packaging.If this sheet element is loaded with alkaline component, then this protective layer is oxygen impermeable layer, and it prevents from reacting prematurely with oxygen before the intended use.Therefore, a requirement is that this protective layer can be removed from this coating layer when not damaging the coating layer.Preferably, this protective layer is made of any polymeric material such as polyethylene, polypropylene or polystyrene or coated paper.If there is a breathable cover layer in this sheet element, then this protective layer is placed on this breathable cover layer.

[0247] The sheet-like element may have a size adjusted according 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 coated 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 diameter of 3-50 or 5-40 cm 2 , for example 3-30cm 2 or 5-25cm 2 coating area or size.

[0248] In one embodiment of the present invention, two or more sheet elements as described above are combined to form a stacked sheet element. 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 single sheet element is not blocked or only slightly blocked. The term "slightly blocked" refers to that at most 25%, preferably at most 15%, and more preferably at most 10% of the coating area of ​​the sheet element is blocked or sealed. Therefore, preferably, two or more sheet elements are combined using intermittent adhesive layers, such as by using glue dots, which are preferably placed between 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 less than the total active oxygen scavenging area.

[0249] In another embodiment of the invention, one or more laminar elements as described above are combined with another functional coating. The one or more laminar elements are combined with the functional coating so that the coating layer of each single laminar element and each functional coating are not blocked or only slightly blocked, for example, by using an intermittent 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 printing layer and a metallized film layer, for example, for microwave packaging.

[0250] The sheet element assembly can be manufactured using the process described below.

[0251] Alkaline components

[0252] The kit of the present invention further comprises a basic component. The basic component comprises a compound having a pK of 6 or less. b Value of base.

[0253] pK b A measure of the strength of a base and corresponds to the addition of a proton to the anion of the base, producing the corresponding acid of the base. pK b The value can be calculated as follows: pK b =14-pK a Both values ​​can be gathered from standard textbooks and / or tables.

[0254] It should be understood that the alkaline component of the kit may consist of the base, or may comprise additional components, 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 present invention, the alkaline component is an aqueous alkaline component comprising a base and water.

[0255] 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, open-ring compounds and quinones, as well as hydrogen peroxide. The reactions are mediated or facilitated by the presence of water. Therefore, a requirement is that the base is dissolved or suspended in water prior to activation.

[0256] Therefore, if the alkaline component of the kit of the present invention does not contain water, the alkaline component is dissolved or suspended in water to form an aqueous alkaline component at the time of use. It is advantageous to dissolve or suspend the alkaline component in water only at the time of use, because this can minimize storage and transportation costs and because it facilitates the handling of the alkaline component before use.

[0257] In a preferred embodiment, the base has a pK of 5 or less. b value, more preferably a pK of 4 or lower b Most preferably, the base has a pK b In the range of 4 to 0.

[0258] 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.

[0259] For the purposes of this invention, a hydroxide base (pK b =0) are considered to be basic 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.

[0260] 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.

[0261] 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.

[0262] 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.

[0263] In a preferred embodiment of the present invention, the kit for improving the shelf life comprises

[0264] a) a chip component assembly having

[0265] a1) a coating layer, the coating layer comprising

[0266] i) a particulate filler in an amount of 25-70% by weight, based on the total dry weight of the coating layer,

[0267] wherein the particulate filler comprises more than 50% by weight of a mineral, based on the total amount of the filler, the mineral being preferably an alkaline earth metal mineral, a silicate or a mixture thereof, wherein the mineral is not surface-reacted calcium carbonate,

[0268] The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated calcium carbonate and carbon dioxide and one or more H3O + The reaction product of the ion donor, wherein

[0269] The carbon dioxide passes through H3O + Ion donors are generated in situ and / or supplied from external sources.

[0270] ii) a polymeric binder in an amount of 5 to 25% by weight based on the total dry weight of the coating layer, and

[0271] 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,

[0272] wherein the at least one oxygen scavenger is selected from phenolic acids having at least two phenolic hydroxyl groups arranged in ortho or para positions relative to each other, cinnamic acid having at least two phenolic hydroxyl groups arranged in ortho or para positions relative to each other, derivatives thereof, and mixtures thereof,

[0273] 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

[0274] a2) basal layer, and

[0275] b) a basic component comprising a b The base is selected from hydroxide bases, carbonate bases, ammonia bases and mixtures thereof.

[0276] In a preferred embodiment of the present invention, the kit for improving the shelf life comprises

[0277] a) a chip component assembly having

[0278] a1) a coating layer, the coating layer comprising

[0279] i) a particulate filler in an amount of 25-70% by weight, based on the total dry weight of the coating layer,

[0280] wherein the particulate filler comprises a mineral in an amount greater than 50% by weight, based on the total amount of the particulate filler, the mineral being selected from precipitated hydromagnesite, ground natural calcium carbonate, precipitated calcium carbonate or a mixture thereof, wherein the mineral is not surface-reacted calcium carbonate,

[0281] The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated calcium carbonate and carbon dioxide and one or more H3O + The reaction product of the ion donor, wherein

[0282] The carbon dioxide passes through H3O+ Ion donors are generated in situ and / or supplied from external sources.

[0283] ii) a polymeric binder in an amount of 5 to 25% by weight based on the total dry weight of the coating layer, and

[0284] 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,

[0285] 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,

[0286] 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

[0287] a2) basal layer, and

[0288] b) a basic component comprising a b The base is selected from hydroxide bases, carbonate bases, ammonia bases and mixtures thereof, preferably an aqueous alkaline component.

[0289] In another preferred embodiment of the present invention, the kit for improving the shelf life comprises:

[0290] a) a chip component assembly having

[0291] a1) a coating layer, the coating layer comprising

[0292] i) a particulate filler in an amount of 25-70% by weight, based on the total dry weight of the coating layer,

[0293] wherein the particulate filler comprises a mineral in an amount of at least 70% by weight based on the total amount of the particulate filler, the mineral is preferably an alkaline earth metal mineral, a silicate or a mixture thereof, more preferably precipitated hydromagnesite, ground natural calcium carbonate, precipitated calcium carbonate or a mixture thereof,

[0294] Where the mineral is not surface-reacted calcium carbonate,

[0295] The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated calcium carbonate and carbon dioxide and one or more H3O + The reaction product of the ion donor, wherein

[0296] The carbon dioxide passes through H3O + Ion donors are generated in situ and / or supplied from external sources.

[0297] 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, its salts, its derivatives, starch, protein, styrene-butadiene latex, polyvinyl alcohol, polyvinyl acetate and mixtures thereof, and

[0298] 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,

[0299] wherein the at least one oxygen scavenger is selected from gallic acid, digallic acid, protocatechuic acid, caffeic acid, 5-hydroxyferulic acid, gentisic acid, chebulic acid, phloroglucinol carboxylic acid, chicoric acid, derivatives thereof, and mixtures thereof, and even more preferably, the at least one oxygen scavenger is selected from gallic acid or its derivatives,

[0300] 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

[0301] a2) basal layer, and

[0302] 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.

[0303] In yet another preferred embodiment of the present invention, the kit for improving the shelf life comprises:

[0304] a) a chip component assembly having

[0305] a1) a coating layer, the coating layer comprising

[0306] i) a particulate filler in an amount of 25-70% by weight, based on the total dry weight of the coating layer,

[0307] wherein the particulate filler comprises a mineral in an amount of at least 90% by weight, based on the total amount of the particulate filler, the mineral is preferably precipitated hydromagnesite, ground natural calcium carbonate, precipitated calcium carbonate or a mixture thereof,

[0308] Where the mineral is not surface-reacted calcium carbonate,

[0309] The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated calcium carbonate and carbon dioxide and one or more H3O + The reaction product of the ion donor, wherein

[0310] The carbon dioxide passes through H3O + Ion donors are generated in situ and / or supplied from external sources.

[0311] 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, its salts, its derivatives, starch, protein, styrene-butadiene latex, polyvinyl alcohol, polyvinyl acetate and mixtures thereof, and

[0312] 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,

[0313] 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, 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 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

[0314] a2) basal layer, and

[0315] 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.

[0316] Activated sheet components

[0317] A second aspect of the invention relates to an activated sheetlike element formed from the kit of the 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.

[0318] It will be appreciated that the kit, the sheet element assembly, the alkaline component, the base and the at least one oxygen scavenger are described in detail above.

[0319] 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 3 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. NH4 + , primary ammonium ion, secondary ammonium ion or tertiary ammonium ion), more preferably selected from lithium, sodium, potassium and cesium, most preferably selected from potassium and sodium.

[0320] 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.

[0321] The inventors have realised 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.

[0322] In another preferred embodiment, the addition amount of the alkaline component is 10-70 wt%, preferably 20-65 wt%, more preferably 35-60 wt%, 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 including the alkaline component.

[0323] 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.

[0324] 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.

[0325] 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. Therefore, the oxygen scavenging activity can be maintained for a long period of time, even at low relative humidity.

[0326] In other words, the activated sheetlike element of the present invention preferably comprises:

[0327] a1) a coating layer, the coating layer comprising

[0328] i) a particulate filler in an amount of 25-70% by weight, based on the total dry weight of the coating layer,

[0329] wherein the particulate filler comprises a mineral in an amount greater than 50% by weight based on the total amount of the particulate filler, the mineral is preferably an alkaline earth metal mineral, a silicate or a mixture thereof, most preferably precipitated hydromagnesite, ground natural calcium carbonate, precipitated calcium carbonate or a mixture thereof,

[0330] Where the mineral is not surface-reacted calcium carbonate,

[0331] The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated calcium carbonate and carbon dioxide and one or more H3O +The reaction product of the ion donor, wherein

[0332] The carbon dioxide passes through H3O + Ion donors are generated in situ and / or supplied from external sources.

[0333] ii) a polymeric binder in an amount of 5 to 25% by weight based on the total dry weight of the coating layer, and

[0334] iii) at least one activated oxygen scavenger in an amount of 25-70% by weight, based on the total dry weight of the coating layer,

[0335] 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, where

[0336] -Y is selected from a direct bond, a linear or branched alkylene group having 1 to 6 carbon atoms and

[0337] -CH=CH- group, preferably, Y is a direct bond, and

[0338] -R 1 is an alkoxycarbonyl group, an aryloxycarboxyl group or a substantially completely deprotonated carboxyl group, and

[0339] a2) Basal layer.

[0340] wherein the coating, the particulate filler, the mineral (e.g. precipitated hydromagnesite), the polymer binder and the substrate layer are as described above. The at least one activated oxygen scavenger is a compound derived from at least one oxygen scavenger as 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.

[0341] 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 20-100mL 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 cm3 The headspace of the tray was filled with a mixture of N2 and O2 (98:2 by volume) and the oxygen content of the headspace of the tray was measured until the oxygen content was 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.

[0342] In another preferred embodiment, the activated sheet element has 75-400 mL O2 / g OS The oxygen scavenging capacity (OSC) of the activated sheet element is given as mL of oxygen adsorbed per gram of oxygen scavenger. The OSC is determined as follows: The activated sheet element is placed 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 of the tray is measured until the oxygen content is constant, for example, it does not vary 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.

[0343] In a preferred embodiment of the present invention, the activated sheetlike element comprises:

[0344] a) a chip component assembly having

[0345] a1) a coating layer, the coating layer comprising

[0346] i) a particulate filler in an amount of 25-70% by weight, based on the total dry weight of the coating layer,

[0347] wherein the particulate filler comprises a mineral in an amount greater than 50% by weight based on the total amount of the particulate filler, the mineral is preferably an alkaline earth metal mineral, a silicate or a mixture thereof, most preferably precipitated hydromagnesite, ground natural calcium carbonate, precipitated calcium carbonate or a mixture thereof,

[0348] Where the mineral is not surface-reacted calcium carbonate,

[0349] The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated calcium carbonate and carbon dioxide and one or more H3O + The reaction product of the ion donor, wherein

[0350] The carbon dioxide passes through H3O + Ion donors are generated in situ and / or supplied from external sources.

[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 25-70% by weight, based on the total dry weight of the coating layer,

[0353] wherein the at least one activated 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 b The base is selected from hydroxide bases, carbonate bases, ammonia bases and mixtures thereof.

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

[0358] a) a chip component assembly having

[0359] a1) a coating layer, the coating layer comprising

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

[0361] wherein the particulate filler comprises a mineral in an amount of at least 70% by weight, based on the total amount of the particulate filler, the mineral being precipitated hydromagnesite, ground natural calcium carbonate, precipitated calcium carbonate or a mixture thereof,

[0362] Where the mineral is not surface-reacted calcium carbonate,

[0363] The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated calcium carbonate and carbon dioxide and one or more H3O + The reaction product of the ion donor, wherein

[0364] The carbon dioxide passes through H3O + Ion donors are generated in situ and / or supplied from external sources.

[0365] 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, its salts, its derivatives, starch, protein, styrene-butadiene latex, polyvinyl alcohol, polyvinyl acetate and mixtures thereof, and

[0366] iii) at least one activated oxygen scavenger in an amount of 25-70% by weight, based on the total dry weight of the coating layer,

[0367] 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, orsellinic 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,

[0368] wherein the acid derivative is selected from the group consisting of alkyl esters, aryl esters and substantially completely deprotonated acids of the corresponding acids,

[0369] wherein the phenolic hydroxyl group of the acid derivative is at least partially deprotonated, and

[0370] a2) basal layer, and

[0371] b) an alkaline component, the 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.

[0372] In yet another preferred embodiment of the present invention, the activated sheetlike element comprises:

[0373] a) a chip component assembly having

[0374] a1) a coating layer, the coating layer comprising

[0375] i) a particulate filler in an amount of 25-70% by weight, based on the total dry weight of the coating layer,

[0376] wherein the particulate filler comprises a mineral in an amount of at least 90% by weight, based on the total amount of the particulate filler, which mineral is precipitated hydromagnesite, ground natural calcium carbonate, precipitated calcium carbonate or a mixture thereof,

[0377] Where the mineral is not surface-reacted calcium carbonate,

[0378] The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated calcium carbonate and carbon dioxide and one or more H3O + The reaction product of the ion donor, wherein

[0379] The carbon dioxide passes through H3O + Ion donors are generated in situ and / or supplied from external sources.

[0380] 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, its salts, its derivatives, starch, protein, styrene-butadiene latex, polyvinyl alcohol, polyvinyl acetate and mixtures thereof, and

[0381] iii) at least one activated oxygen scavenger in an amount of 25-70% by weight, based on the total dry weight of the coating layer,

[0382] 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, orsellinic 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,

[0383] 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,

[0384] wherein the phenolic hydroxyl group of the acid derivative is at least partially deprotonated, and

[0385] a2) basal layer, and

[0386] b) an alkaline component, the 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.

[0387] The activated sheetlike element can be produced in the process described below.

[0388] Method of the present invention

[0389] A third aspect of the present invention relates to a method for manufacturing a set for improving the shelf life of food. The method comprises the following steps:

[0390] a) providing a particulate filler, the particulate filler comprising a mineral in an amount greater than 50% by weight, based on the total amount of the particulate filler, the mineral preferably being an alkaline earth metal mineral, a silicate or a mixture thereof,

[0391] Wherein the mineral is not surface-reacted calcium carbonate, 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 + Ion donors are generated in situ and / or supplied from external sources.

[0392] 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 1group, preferably, wherein R is -YR 1 Group, where

[0393] -Y is selected from a direct bond, a linear or branched alkylene group having 1 to 6 carbon atoms and

[0394] -CH=CH- group, preferably, Y is a direct bond, and

[0395] -R 1 is an alkoxycarbonyl group, an aryloxycarboxyl group, a carboxyl group or a substantially completely deprotonated carboxyl group,

[0396] c) providing a polymer binder,

[0397] d) providing a substrate layer comprising one or more individual substrate layers or a food packaging comprising the substrate layer,

[0398] 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,

[0399] f) applying the coating composition of step e) onto the substrate layer of step d) to obtain a sheet-like element precursor,

[0400] g) drying the sheet-like element precursor obtained in step f) to obtain a sheet-like element assembly,

[0401] h) providing a basic component comprising a b value of base, and optionally

[0402] i) mixing the alkaline component of step h) with water to obtain an aqueous alkaline component comprising the base and water, wherein preferably,

[0403] - 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

[0404] - 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.

[0405] In a fourth aspect of the present invention, a method for manufacturing a sheet-like component assembly is provided. The method comprises the following steps:

[0406] a) providing a particulate filler, the particulate filler comprising a mineral in an amount greater than 50% by weight, based on the total amount of the particulate filler, the mineral preferably being an alkaline earth metal mineral, a silicate or a mixture thereof,

[0407] Where the mineral is not surface-reacted calcium carbonate,

[0408] The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated 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 + Ion donors are generated in situ and / or supplied from external sources.

[0409] 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, where

[0410] -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

[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 the 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, where

[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. In addition, the at least one oxygen scavenger provided in step b) of the method of the present invention, the polymer 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 polymer binder of step c) may be provided independently of each other 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 polymer binder of step c) is provided in the form of a solution or suspension, or is dissolved or suspended in a solvent before 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 value of at least 7, preferably at least 8, for example 8-12, for example 8-10. Any acid or base known to those skilled in the art can be used to adjust the pH value. If the pH value of the solution is initially lower than 7, it is preferred to use an aqueous solution of an alkali such as sodium hydroxide solution to adjust the pH value. Adjusting the pH value 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 said 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) when temporarily stored can be stored under an inert gas atmosphere, for example under nitrogen, until its further processing or use.

[0430] It should be 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% by weight based on the total dry weight of the coating layer. Therefore, 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% by weight 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 may be any solvent that allows the granular filler containing the mineral, the at least one oxygen scavenger and the polymer 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% by weight, more preferably 20-70% by weight, even more preferably 30-60% by weight, most preferably 40-55% by weight, based on the total weight of the coating composition.

[0433] During the mixing step e), further 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 further additives may be added in an amount of 0.05-5.0% by weight, preferably 0.1-2.0% by weight, 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 wt.-%, preferably 0.5-7 wt.-%, more preferably 1-4 wt.-%, based on the total dry weight of the coating composition. In this embodiment, a requirement is 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 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 (eg 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 the application step f), the coating composition of step e) is applied to the substrate layer of step d) to form the sheet-like element precursor. The application step f) can be carried out by any means known to those skilled in the art, for example by spraying or coating. Preferably, the application step f) is carried out in the following manner: a coating step, more preferably roller coating, dip coating, rod coating, grooved rod coating, curtain coating, hard blade coating, coating roller coating, fountain coating, spray coating, short dwell coating, slotted die coating, curved blade coating, bevel blade coating, air knife coating, bar coating, gravure coating, conventional or metered size press coating, spray application technology, screen printing and / or wet stack coating, and most preferably 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 as the coating composition is applied in the application step f) 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 the person 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 sheetlike element thus obtained comprises a coating layer preferably having a total intrusive specific pore volume of 0.25-2 cm 2 measured by mercury intrusion porosimetry. 3 In a preferred embodiment, the total intrusive 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 intrusive specific pore volume of 0.05-1.0 cm-1 as measured by mercury intrusion porosimetry 3 / g, preferably 0.08-0.5cm 3 / g and more preferably 0.1-0.4cm 3 / g,

[0443] - 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 0.1-0.3cm 3 / g, and / or

[0444] -Having 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): providing an alkaline component comprising a hydroxyl group having a pK of 6 or less. b In the step, a basic component as described above is provided.

[0446] Preferably, the method of the present invention for making 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, where

[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] If the mineral is alkaline, i.e. capable of reacting with free carboxyl groups, such as is the case for carbonates such as alkaline earth metal carbonates (e.g. calcium carbonate, magnesium carbonate and precipitated hydromagnesite), it is particularly advantageous for the method for manufacturing a sheet element assembly according to the fourth aspect of the invention to carry out said sub-steps b1) to b3). In this case, sub-steps b1) to b3) can be used to provide the oxygen scavenger of step b) of the method for manufacturing a kit for improving the shelf life according to the third aspect of the invention.

[0457] The present inventors have found that oxygen scavengers comprising free carboxylic acids are capable of reacting with alkaline minerals such as calcium carbonate, which may damage their structure and ultimately result in a coating layer with reduced porosity. Such coating layers accommodate lower amounts of aqueous alkaline components and are therefore less effective as oxygen scavenging elements. Therefore, oxygen scavenger precursors comprising free carboxylic acids are most preferably 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 optional gases. 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, most preferably calcium carbonate.

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

[0460] During step b3), the basic compound is preferably added to the oxygen scavenger precursor in a molar amount of 50%-110%, preferably 80%-100%, more preferably 90%-100%, even more preferably 95%-100%, still more preferably 98%-100%, most preferably 98%-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 under mixing as described above under step e).

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

[0462] a) providing a particulate filler, the particulate filler comprising a mineral in an amount greater than 50% by weight, based on the total amount of the particulate filler, the mineral preferably being an alkaline earth metal mineral, a silicate or a mixture thereof, more preferably being precipitated hydromagnesite, ground natural calcium carbonate, precipitated calcium carbonate or a mixture thereof,

[0463] Where the mineral is not surface-reacted calcium carbonate,

[0464] The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated 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 + Ion donors are generated in situ and / or supplied from external sources.

[0465] b) providing at least one oxygen scavenger selected from phenolic acid derivatives having at least two phenolic hydroxyl groups arranged ortho or para relative to each other, cinnamic acid derivatives having at least two phenolic hydroxyl groups arranged ortho or para 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 the 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 element assembly comprises the following steps:

[0476] a) providing a particulate filler, the particulate filler comprising a mineral in an amount of at least 70% by weight, based on the total amount of the particulate filler, the mineral being precipitated hydromagnesite, ground natural calcium carbonate, precipitated calcium carbonate or a mixture thereof,

[0477] Where the mineral is not surface-reacted calcium carbonate,

[0478] The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated 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 is preferably

[0479] 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,

[0480] 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, orsellinic acid derivatives, chebulic acid derivatives, phloroglucinol carboxylic 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,

[0481] c) providing a polymer binder,

[0482] d) providing a substrate layer comprising one or more individual substrate layers or a food packaging comprising the substrate layer,

[0483] 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,

[0484] f) applying the coating composition of step e) onto the substrate layer of step d) to obtain a sheet-like element precursor, and

[0485] g) drying the sheet-like element precursor obtained in step f) to obtain a sheet-like element assembly,

[0486] Wherein the step b) of providing the at least one oxygen scavenger comprises the following sub-steps:

[0487] b1) providing at least one oxygen scavenger precursor selected from gallic acid, digallic acid, protocatechuic acid, caffeic acid, 5-hydroxyferulic acid, gentisic acid, orsellinic acid, chebulic acid, phloroglucinol carboxylic acid, chicoric acid, and mixtures thereof, even more preferably, the at least one oxygen scavenger is gallic acid,

[0488] 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

[0489] 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.

[0490] A fifth aspect of the present invention relates to a method for activating an assembly of sheet-like elements of the present invention of a set of the present invention. The method comprises the following steps:

[0491] j) mixing the alkaline component with water to obtain an aqueous alkaline component comprising the base and water, and

[0492] k) applying the aqueous alkaline component to at least a portion of the surface of the coating layer.

[0493] It should be understood that the sheet-like element assembly of the present invention is as described above and can be obtained by any of the methods described herein. In addition, the set, the alkaline component, the aqueous alkaline component, the base and the coating layer are as described above. The method results in obtaining an activated sheet-like element, preferably as described above.

[0494] 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.

[0495] Applying step k) can be carried out on at least a portion of the surface of this coating by any measures known to those skilled in the art, preferably by inkjet printing, spraying, coating, vapor deposition and / or dripping. In one embodiment, applying step k) is carried out by coating. It should be understood that this aqueous alkaline component can be applied by any coating mode known to those skilled in the art, including but not limited to roller coating, dip coating, rod coating, grooved rod coating, curtain coating, hard scraper coating, coating roller coating, fountain coating, spray coating, short-stay coating, slotted die coating, curved scraper coating, bevel scraper coating, air knife coating, scraper bar coating, gravure coating, traditional or metered sizing press coating, spraying application technology, spin coating, screen printing and / or wet stacking, preferably dip coating, slotted die coating and / or spin coating.

[0496] In a preferred embodiment, the application step k) is carried out by inkjet printing, spraying, coating and / or dripping. In a particularly preferred embodiment, the application step k) is carried out by spraying. The aqueous alkaline component can be sprayed onto the surface of the coating from the top or from the bottom.

[0497] The application step k) can be carried out directly after the production of the sheet-like 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-like element, or to store the activated sheet-like element in a supply device as described below to prevent the removal of oxygen before the activated sheet-like element is incorporated into the food packaging.

[0498] However, it is particularly preferred that the application step k) is carried out immediately or shortly before the activated sheetlike element is placed in the food packaging. Thus, premature oxygen removal can be effectively avoided. In other words, preferably, the sheetlike element and the set are transported and stored in a non-activated state.

[0499] 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. Printing methods suitable for the present invention include inkjet printing, offset printing, flexographic printing and gravure printing.

[0500] 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 package or the type of food. The coated 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 diameter of 3-8 or 5-10 cm 2 coating area or size.

[0501] Supply device of the present invention

[0502] The kit of the present invention may also include a supply device, which includes the sheet element assembly of the present invention, wherein the supply device preferably includes a roller or a magazine. In addition, a sixth aspect of the present invention relates to a supply device including the activated sheet element of the present invention, wherein the supply device protects the activated sheet element from the influence of oxygen and preferably includes a roller, a stack, a magazine or a package, such as a box.

[0503] The supply device comprises a sheet-like element assembly or an activated sheet-like element of any of the aforementioned aspects of the present invention. Preferably, the supply device comprises a roller or a magazine comprising the sheet-like element. The supply device can be a label dispenser or a label applicator comprising the roller and / or the magazine. However, the supply device can also be a sheet comprising at least two sheet-like elements of the present invention. Therefore, preferably, the sheet-like element can be reversibly and non-destructively removed from the supply device.

[0504] Therefore, the sheet-like element can be easily distributed and provided at the time of use.

[0505] Food packaging of the present invention

[0506] The kit of the 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 invention relates to a food packaging comprising the activated sheet-like element of the invention, wherein the coating layer is present within the food packaging. It should be understood that the sheet-like element and the coating layer are as defined above.

[0507] 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.

[0508] 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 substantially 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 the optional modified atmosphere. The food packaging can be closed or sealed by any means known to those skilled in the art.

[0509] Alternatively or additionally, the atmosphere of the food package comprises a relative humidity in the range of greater than 0 to 100% rH. The activated sheetlike element of the invention effectively scavenge oxygen at a relative humidity of 30-100% rH, preferably 50-100% rH.

[0510] 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 permanent pressure-sensitive adhesives, removable pressure-sensitive adhesives and resealable pressure-sensitive adhesives, preferably resealable pressure-sensitive adhesives.

[0511] In 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.

[0512] 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, sausages; dried meats; raw and processed fish; dairy products, such as cheese, such as sliced ​​cheese 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 so on.

[0513] The present inventors have found 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.

[0514] In a preferred embodiment of the present invention, the food packaging of the present invention is a set, the set comprising

[0515] a) a chip component assembly having

[0516] a1) a coating layer present in the food packaging, the coating layer comprising

[0517] i) a particulate filler in an amount of 25-70% by weight, based on the total dry weight of the coating layer,

[0518] wherein the particulate filler comprises a mineral in an amount greater than 50% by weight based on the total amount of the particulate filler, the mineral being preferably an alkaline earth metal mineral, a silicate or a mixture thereof,

[0519] Where the mineral is not surface-reacted calcium carbonate,

[0520] The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated calcium carbonate and carbon dioxide and one or more H3O + The reaction product of the ion donor, wherein

[0521] The carbon dioxide passes through H3O + Ion donors are generated in situ and / or supplied from external sources.

[0522] ii) a polymeric binder in an amount of 5 to 25% by weight based on the total dry weight of the coating layer, and

[0523] 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,

[0524] wherein the at least one oxygen scavenger is selected from phenolic acids with at least two phenolic hydroxyl groups arranged in ortho or para positions relative to each other, cinnamic acid with at least two phenolic hydroxyl groups arranged in ortho or para positions relative to each other, derivatives thereof, and mixtures thereof,

[0525] 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

[0526] a2) basal layer, and

[0527] b) a basic component comprising a b The base is selected from hydroxide bases, carbonate bases, ammonia bases and mixtures thereof, preferably an aqueous alkaline component.

[0528] In another preferred embodiment of the present invention, the food packaging of the present invention is a set comprising:

[0529] a) a chip component assembly having

[0530] a1) a coating layer present in the food packaging, the coating layer comprising

[0531] i) a particulate filler in an amount of 25-70% by weight, based on the total dry weight of the coating layer,

[0532] wherein the particulate filler comprises a mineral in an amount of at least 70% by weight based on the total amount of the particulate filler, the mineral is preferably an alkaline earth metal mineral, a silicate or a mixture thereof, more preferably precipitated hydromagnesite, ground natural calcium carbonate, precipitated calcium carbonate or a mixture thereof,

[0533] Where the mineral is not surface-reacted calcium carbonate,

[0534] The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated calcium carbonate and carbon dioxide and one or more H3O + The reaction product of the ion donor, wherein

[0535] The carbon dioxide passes through H3O + Ion donors are generated in situ and / or supplied from external sources.

[0536] 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, its salts, its derivatives, starch, protein, styrene-butadiene latex, polyvinyl alcohol, polyvinyl acetate and mixtures thereof, and

[0537] 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,

[0538] wherein the at least one oxygen scavenger is selected from gallic acid, digallic acid, protocatechuic acid, caffeic acid, 5-hydroxyferulic acid, gentisic acid, chebulic acid, phloroglucinol carboxylic acid, chicoric acid, derivatives thereof, and mixtures thereof, and even more preferably, the at least one oxygen scavenger is selected from gallic acid or its derivatives,

[0539] 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

[0540] a2) basal layer, and

[0541] 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.

[0542] In yet another preferred embodiment of the present invention, the food package of the present invention is a set comprising:

[0543] a) a chip component assembly having

[0544] a1) a coating layer present in the food packaging, the coating layer comprising

[0545] i) a particulate filler in an amount of 25-70% by weight, based on the total dry weight of the coating layer,

[0546] wherein the particulate filler comprises a mineral in an amount of at least 90% by weight, based on the total amount of the particulate filler, the mineral being precipitated hydromagnesite,

[0547] 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, its salts, its derivatives, starch, protein, styrene-butadiene latex, polyvinyl alcohol, polyvinyl acetate and mixtures thereof, and

[0548] 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,

[0549] 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, 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 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

[0550] a2) basal layer, and

[0551] 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.

[0552] Uses of the present invention

[0553] 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.

[0554] It will be appreciated that the kit, the activated sheetlike element and the food packaging are as described above.

[0555] As described in detail above, the activated sheetlike element of the present invention loaded with the alkaline component effectively and quickly 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, and Trichoderma, Hepatitis A, Cyclospora cayetanensis and Trichinella spiralis. The presence of oxygen can also lead to flavor deterioration or rancidity due to oxidation and to 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 therefore also consumer acceptance, which in turn limits or shortens the shelf life of the food. This oxygen scavenging activity also prevents or reduces the degradation of vitamin C in fruit or vegetable juices, such as orange juice, for example. .

[0556] The activated sheetlike element of the present invention comprises an oxygen scavenger in an amount sufficient to obtain the desired oxygen reduction in food packaging. A person skilled in the art will adjust, for example, the size 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 element of the present invention, as taught herein, in order to obtain the desired effect in food packaging.

[0557] For example, the corresponding amount can be adjusted so that the at least one oxygen scavenger is present in the food packaging 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 Head space or 0.01-1mg / 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.

[0558] Preferably, the food is stored at a common temperature for storing cooled or refrigerated foods, i.e. 0° C.-14° C., preferably 3° C.-10° C., more preferably 4° C.-7° C., such as 7±1° C. However, the food can also be stored at room temperature, i.e. 15° C.-30° C., preferably 18° C.-25° C., such as 18° C.-22° C. Therefore, the shelf life of the food in the food packaging can be extended.

[0559] 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.

[0560] In another preferred embodiment of the present invention, the activated sheet element of the present invention removes at least 90%, preferably at least 95% of oxygen from the top 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.

[0561] In another preferred embodiment, the activated sheetlike element according to the invention is used to keep the oxygen content in the headspace of a 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] 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 residual oxygen from the modified atmosphere headspace of the food packaging at 20±2°C within 12 hours.

[0563] In another preferred embodiment, the activated sheetlike elements of the invention are used to maintain the oxygen content in the modified atmosphere headspace of a food package below 0.5 vol. %, preferably below 0.2 vol. %, more preferably below 0.1 vol. % during storage for at least 21 days.

[0564] 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.

[0565] Example

[0566] Materials and methods

[0567] Gallic acid was purchased from Acros Organics as the monohydrate. Acronal 500D was purchased from BASF.

[0568] Untreated calcium carbonate 1: marble from Italy; d 50 (vol)=1.83μm,d 98 (vol) = 7 μm (Malvern 3000; dry).

[0569] Dispersant: 100% sodium neutralized polyacrylate dispersant, molecular weight MW about 4500 g / mol, polydispersity index IP 1.6 (2 g, 42% solids content)

[0570] Binder: Acronal 500D: polyacrylate binder (15 g, 46% solids content by weight).

[0571] Preparation of coating formulations

[0572] 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. Dispersant (2 g) was added and the mineral (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).

[0573] Preparation of sheet element precursors

[0574] PET halves (Hostaphan RN 100, 100 microns, PützFolien) were coated with a Durrer coating machine (see Figure 2). 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.

[0575] Oxygen scavenging activity (OSA) of sheet elements

[0576] The above machine coating method was used to produce a coating weight of 22 g / m 2 The sheet elements containing gallic acid-based coating layers of the different minerals listed in Table 1 were prepared and cut into rectangular pieces of 6 x 11 cm. The sheet elements were separately packed in empty high-barrier trays (PS-EVOH-PE, with skin, 0.5 mm, 204 x 147 mm, 14 mm high, 20 mm thick) with oxygen sensor points (PSt 6 model, PreSens Precision Sensing GmbH, Regensburg, Germany) using a tray sealer T200 (MULTIVAC (Hünenberg, Switzerland)) in an atmosphere containing 98 vol. % N2 and 2 vol. % 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).

[0577] Before sealing, a 1M potassium carbonate solution (130 μL ± 10 μL each) was added to each sheet element by an E2 EUR spray station 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 Fibox4trace (PreSens Precision Sensing GmbH, Regensburg, Germany). Each measurement was performed in duplicate. The results were averaged and summarized in Table 2.

[0578] Table 1. Minerals used in sheet elements.

[0579]

[0580] GCC – ground calcium carbonate, PHM – precipitated hydromagnesite, PCC – precipitated calcium carbonate, SSA – specific surface area.

[0581] The sheet elements were tested for oxygen scavenging activity as described in Example 1. The results are summarized in Table 2.

[0582] Table 2. Oxygen scavenging activity of sheet-like elements comprising different minerals.

[0583]

[0584] a) oxygen content after 8 days = 0.12%, b) oxygen content after 8 days = 0.05%, c) oxygen content after 6.7 days = 0.37%, d) oxygen content after 4.6 days = 0.12%.

[0585] Other aspects and embodiments of the invention are described below:

[0586] Aspect or embodiment 1: A kit for improving the shelf life of food, the kit comprising

[0587] a) a chip component assembly having

[0588] a1) a coating layer, the coating layer comprising

[0589] i) a particulate filler in an amount of 25-70% by weight, based on the total dry weight of the coating layer,

[0590] wherein the particulate filler comprises more than 50% by weight of a mineral, based on the total amount of the filler, the mineral being preferably an alkaline earth metal mineral, a silicate or a mixture thereof, wherein the mineral is not surface-reacted calcium carbonate,

[0591] The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated 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 + Ion donors are generated in situ and / or supplied from external sources.

[0592] ii) a polymeric binder in an amount of 5 to 25% by weight based on the total dry weight of the coating layer, and

[0593] 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,

[0594] 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 1Group, where

[0595] -Y is selected from a direct bond, a linear or branched alkylene group having 1 to 6 carbon atoms and

[0596] -CH=CH- group, preferably, Y is a direct bond, and

[0597] -R 1 is an alkoxycarbonyl group, an aryloxycarboxyl group or a substantially completely deprotonated carboxyl group, and

[0598] a2) basal layer, and

[0599] b) a basic component comprising a b Value of base.

[0600] 2. The kit of embodiment 1, wherein the sheet-like element assembly comprises a coating layer, the coating layer

[0601] - 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

[0602] - 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 0.1-0.4cm 3 / g, and / or

[0603] - have 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 0.1-0.3cm 3 / g, and / or

[0604] -Having 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

[0605] -1-200g / m 2 , preferably 2-150g / m 2 , more preferably 10-120g / m 2 An amount of is present on the base layer.

[0606] 3. The kit of any one of the preceding embodiments, wherein the coating comprises

[0607] - an amount of 10-20% by weight of the polymer binder, based on the total dry weight of the coating layer, and / or

[0608] - an amount of 30-60% by weight of the particulate filler, based on the total dry weight of the coating layer, and / or

[0609] - the oxygen scavenger in an amount of 30-60% by weight, based on the total dry weight of the coating layer.

[0610] 4. The kit of any one of the preceding embodiments, wherein the mineral is not a calcium carbonate other than ground natural calcium carbonate and precipitated calcium carbonate, more preferably, the mineral is not a calcium carbonate other than ground natural calcium carbonate.

[0611] 5. The kit of any one of the preceding embodiments, wherein the particulate filler comprises at least 70% by weight, preferably at least 90% by weight, of the mineral, based on the total weight of the particulate filler, and most preferably, the particulate filler consists of the mineral.

[0612] 6. The kit according to any of the preceding embodiments, wherein the mineral is an alkaline earth metal mineral, preferably selected from the group consisting of alkaline earth metal carbonates, alkaline earth metal phosphates, alkaline earth metal sulfates, alkaline earth metal oxides, alkaline earth metal hydroxides and mixtures thereof,

[0613] More preferably, the alkaline earth metal mineral is selected from carbonates, phosphates, sulfates, oxides, hydroxides and mixtures thereof of calcium and / or magnesium,

[0614] Even more preferably, the alkaline earth metal mineral is selected from calcium carbonate, magnesium carbonate and mixtures thereof, and

[0615] Most preferably, the alkaline earth metal mineral is selected from precipitated hydromagnesite, ground natural calcium carbonate and precipitated calcium carbonate.

[0616] 7. The kit of any one of the preceding embodiments, wherein the mineral is a silicate selected from aluminosilicates, alkaline earth metal-containing silicates and mixtures thereof, and more preferably selected from zeolites, perlite, kaolin, bentonite, calcined clay and mixtures thereof.

[0617] 8. The kit of any one of the preceding embodiments, wherein the mineral has

[0618] - Specific surface area measured by BET method according to ISO 9277:2010 is 20-200m 2 / g, preferably 50-120m 2 / g, and / or

[0619] - 0.1-2.5 cm 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 / g range of total intra-particle intrusive specific pore volume, and / or

[0620] - 0.1-6 cm measured by mercury intrusion porosimetry 3 / g, preferably 1-5cm 3 / g, more preferably 2-5cm 3 / g and most preferably 2.5-5cm 3 / g range of total intrusive specific pore volume.

[0621] 9. The kit according to any of the preceding embodiments, wherein the particulate filler comprises as the mineral precipitated hydromagnesite in an amount of more than 50% by weight based on the total amount of the particulate filler, preferably

[0622] wherein the particulate filler comprises the precipitated hydromagnesite in an amount of at least 70% by weight, preferably at least 90% by weight, based on the total amount of the particulate filler, and most preferably, the particulate filler consists of the precipitated hydromagnesite, and

[0623] 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 precipitated hydromagnesite.

[0624] 10. The kit of embodiment 9, wherein the precipitated hydromagnesite has

[0625] - Specific surface area measured by BET method according to ISO 9277:2010 is 20-200m 2 / g, preferably 50-120m 2 / g, and / or

[0626] - 0.1-2.5 cm 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 / g range of total particle intrusive specific pore volume.

[0627] 11. The kit of any one of the preceding embodiments, wherein

[0628] the at least one oxygen scavenger is chosen from phenolic acids with at least two phenolic hydroxyl groups arranged in ortho or para position relative to each other, cinnamic acid with at least two phenolic hydroxyl groups arranged in ortho or para position relative to each other, derivatives thereof and mixtures of the foregoing,

[0629] Preferably, wherein the at least one oxygen scavenger is selected from gallic acid, digallic acid, protocatechuic acid, caffeic acid, 5-hydroxyferulic acid, gentisic acid, erotic acid, chebulic acid, phloroglucinol carboxylic acid, chicoric acid, derivatives thereof and mixtures thereof, even more preferably, the at least one oxygen scavenger is a gallic acid derivative,

[0630] wherein the acid derivative is selected from the group consisting of alkyl esters, aryl esters and substantially completely deprotonated acids of the corresponding acids,

[0631] And most preferably, the at least one oxygen scavenger is substantially completely deprotonated gallic acid, and / or

[0632] - 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.

[0633] 12. The kit of any one of the preceding embodiments, wherein the polymer binder is selected from 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 polyacrylic acid, its salts, its derivatives and mixtures thereof.

[0634] 13. A set according to any 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-furan dicarboxylate, 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 materials; 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.

[0635] 14. The kit of any one of the preceding embodiments, wherein the sheet element assembly further comprises

[0636] - 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

[0637] - one or more primer layers, located between the base layer and the coating layer, and / or

[0638] - one or more oxygen permeable covering layers covering the coating layer, preferably selected from oxygen permeable film layers, fibrous material layers and non-woven fabric layers, and / or

[0639] - 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,

[0640] Preferably, the sheet element assembly further comprises

[0641] - one or more oxygen permeable cover layers, for covering the coating layer, preferably selected from oxygen permeable film layers, fibrous material layers and nonwoven fabric layers, and / or

[0642] - 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.

[0643] 15. 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.

[0644] 16. 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

[0645] - 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

[0646] - 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.

[0647] Aspect or embodiment 17, an activated sheet-like element formed by adding the alkaline component to the coating layer of the sheet-like element assembly from the kit of any of the preceding embodiments, wherein the activated sheet-like element comprises the reaction product of the at least one oxygen scavenger and the base, wherein preferably - the alkaline 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

[0648] 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.

[0649] 18. An activated sheet-like element according to embodiment 17, 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.

[0650] 19. The activated sheet-like element according to embodiment 17 or 18, further comprising

[0651] - one or more oxygen permeable cover layers, for covering the coating layer, preferably selected from oxygen permeable film layers, fibrous material layers and nonwoven fabric layers, and / or

[0652] - 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.

[0653] Aspect or Embodiment 20: A method of making a kit for improving the shelf life of food, the method comprising the steps of:

[0654] a) providing a particulate filler, the particulate filler comprising more than 50% by weight of a mineral, based on the total amount of the filler, the mineral preferably being an alkaline earth metal mineral, a silicate or a mixture thereof,

[0655] Where the mineral is not surface-reacted calcium carbonate,

[0656] The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated 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 + Ion donors are generated in situ and / or supplied from external sources.

[0657] 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, where

[0658] -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

[0659] -R 1 is an alkoxycarbonyl group, an aryloxycarboxyl group, a carboxyl group or a substantially completely deprotonated carboxyl group,

[0660] c) providing a polymer binder,

[0661] d) providing a substrate layer comprising one or more individual substrate layers or a food packaging comprising the substrate layer,

[0662] 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,

[0663] f) applying the coating composition of step e) onto the substrate layer of step d) to obtain a sheet-like element precursor,

[0664] g) drying the sheet-like element precursor obtained in step f) to obtain a sheet-like element assembly,

[0665] h) providing a basic component comprising a b value of base, and optionally

[0666] i) mixing the alkaline component of step h) with water to obtain an aqueous alkaline component comprising the base and water, wherein preferably,

[0667] - 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

[0668] - 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.

[0669] Aspect or embodiment 21: A method of manufacturing a sheet-like element assembly, the method comprising the steps of:

[0670] a) providing a particulate filler, the particulate filler comprising more than 50% by weight of a mineral, based on the total amount of the filler, the mineral preferably being an alkaline earth metal mineral, a silicate or a mixture thereof,

[0671] Where the mineral is not surface-reacted calcium carbonate,

[0672] The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated 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 + Ion donors are generated in situ and / or supplied from external sources.

[0673] 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, where

[0674] -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

[0675] -R 1 is a carboxyl group that is essentially completely deprotonated,

[0676] c) providing a polymer binder,

[0677] d) providing a substrate layer comprising one or more individual substrate layers or a food packaging comprising the substrate layer,

[0678] 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,

[0679] f) applying the coating composition of step e) onto the substrate layer of step d) to obtain a sheet-like element precursor, and

[0680] g) drying the sheet-like element precursor obtained in step f) to obtain a sheet-like element assembly,

[0681] Wherein the step b) of providing the at least one oxygen scavenger comprises the following sub-steps:

[0682] 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 -YR1 Group, where

[0683] -Y is selected from a direct bond, a linear or branched alkylene group having 1 to 6 carbon atoms and

[0684] -CH=CH- group, preferably, Y is a direct bond, and

[0685] -R 1 It is a carboxyl group.

[0686] b2) providing a basic compound, and

[0687] 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.

[0688] 22. The method of embodiment 21, 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.

[0689] 23. The method according to any one of embodiments 20 to 22, wherein the mineral is not calcium carbonate other than ground natural calcium carbonate and precipitated calcium carbonate, more preferably, the mineral is not calcium carbonate other than ground natural calcium carbonate.

[0690] 24. The method according to any one of embodiments 20 to 23, wherein

[0691] - the mixing step e) is carried out in the presence of a solvent, preferably water, and / or

[0692] - 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 overlay coating, preferably roller coating, and / or

[0693] - 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.

[0694] 25. The method of any one of embodiments 20-24, wherein the sheet element assembly comprises a coating layer, the coating layer

[0695] - having a total intrusive specific pore volume of 0.1-1.5 cm as measured by mercury intrusion porosimetry3 / g, preferably 0.1-1.0cm 3 / g, and / or

[0696] - 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 0.1-0.4cm 3 / g, and / or

[0697] - have 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 0.1-0.3cm 3 / g, and / or

[0698] -Having 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

[0699] -1-200g / m 2 , preferably 2-150g / m 2 , more preferably 10-120g / m 2 An amount of is present on the base layer.

[0700] 26. The method of any one of embodiments 20-25, wherein the coating layer comprises

[0701] - an amount of 10-20% by weight of the polymer binder, based on the total dry weight of the coating layer, and / or

[0702] - an amount of 30-60% by weight of the particulate filler, based on the total dry weight of the coating layer, and / or

[0703] - the oxygen scavenger in an amount of 30-60% by weight, based on the total dry weight of the coating layer.

[0704] 27. The method of any one of embodiments 20-26, wherein the particulate filler comprises the mineral 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 mineral, 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 optionally present additional particulate filler material and the mineral.

[0705] 28. The method according to any one of embodiments 19 to 27, wherein the mineral is an alkaline earth metal mineral, preferably selected from the group consisting of alkaline earth metal carbonates, alkaline earth metal phosphates, alkaline earth metal sulfates, alkaline earth metal oxides, alkaline earth metal hydroxides and mixtures thereof,

[0706] More preferably, the alkaline earth metal mineral is selected from carbonates, phosphates, sulfates, oxides, hydroxides and mixtures thereof of calcium and / or magnesium,

[0707] Even more preferably, the alkaline earth metal mineral is selected from calcium carbonate, magnesium carbonate and mixtures thereof, and

[0708] Most preferably, the alkaline earth metal mineral is selected from precipitated hydromagnesite, ground natural calcium carbonate and precipitated calcium carbonate.

[0709] 29. The method of any one of embodiments 20-29, wherein the mineral is a silicate selected from aluminosilicates, alkaline earth metal-containing silicates and mixtures thereof, and more preferably selected from zeolites, perlite, kaolin, bentonite, calcined clay and mixtures thereof.

[0710] 30. The method of any one of embodiments 20-29, wherein the mineral has

[0711] - Specific surface area measured by BET method according to ISO 9277:2010 is 20-200m 2 / g, preferably 50-120m 2 / g, and / or

[0712] - 0.1-2.5 cm 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 / g range of total intra-particle intrusive specific pore volume, and / or

[0713] - 0.1-6 cm measured by mercury intrusion porosimetry 3 / g, preferably 1-5cm 3 / g, more preferably 2-5cm 3 / g and most preferably 2.5-5cm 3 / g range of total intrusive specific pore volume.

[0714] 31. The method according to any one of embodiments 20 to 30, wherein the particulate filler comprises precipitated hydromagnesite as the mineral in an amount of more than 50% by weight based on the total amount of the particulate filler, preferably,

[0715] wherein the particulate filler comprises the precipitated hydromagnesite in an amount of at least 70% by weight, preferably at least 90% by weight, based on the total amount of the particulate filler, and most preferably, the particulate filler consists of the precipitated hydromagnesite, and

[0716] 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 precipitated hydromagnesite.

[0717] 32. The method of embodiment 31, wherein the precipitated hydromagnesite has

[0718] - Specific surface area measured by BET method according to ISO 9277:2010 is 20-200m 2 / g, preferably 50-120m 2 / g, and / or

[0719] - 0.1-2.5 cm 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 / g range of total particle intrusive specific pore volume.

[0720] 33. The method of any one of embodiments 20-32, wherein

[0721] the at least one oxygen scavenger is chosen from phenolic acids with at least two phenolic hydroxyl groups arranged in ortho or para position relative to each other, cinnamic acid with at least two phenolic hydroxyl groups arranged in ortho or para position relative to each other, derivatives thereof and mixtures of the foregoing,

[0722] Preferably, wherein the at least one oxygen scavenger is selected from gallic acid, digallic acid, protocatechuic acid, caffeic acid, 5-hydroxyferulic acid, gentisic acid, erotic acid, chebulic acid, phloroglucinol carboxylic acid, chicoric acid, derivatives thereof and mixtures thereof, even more preferably, the at least one oxygen scavenger is a gallic acid derivative,

[0723] wherein the acid derivative is selected from the group consisting of alkyl esters, aryl esters and substantially completely deprotonated acids of the corresponding acids,

[0724] And most preferably, the at least one oxygen scavenger is substantially completely deprotonated gallic acid, and / or

[0725] - 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.

[0726] 34. The method according to any one of embodiments 20 to 33, 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.

[0727] 35. The method of any one of embodiments 20-34, 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-furan dicarboxylate, 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 materials; a wood layer; a bamboo layer; a metal foil layer; an aluminum layer; a print-receptive coating; and a mixture of the above, 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.

[0728] 36. The method of any one of embodiments 20-35, wherein the sheet element assembly further comprises

[0729] - 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

[0730] - one or more primer layers, located between the base layer and the coating layer, and / or

[0731] - one or more oxygen permeable covering layers covering the coating layer, preferably selected from oxygen permeable film layers, fibrous material layers and non-woven fabric layers, and / or

[0732] - 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,

[0733] Preferably, the sheet element assembly further comprises

[0734] - one or more oxygen permeable cover layers, for covering the coating layer, preferably selected from oxygen permeable film layers, fibrous material layers and nonwoven fabric layers, and / or

[0735] - 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.

[0736] 37. The method of any one of embodiments 20-36, 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.

[0737] 38. The method of any one of embodiments 20 to 37, wherein the alkaline component is an aqueous alkaline component comprising the base and water, wherein preferably

[0738] - 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

[0739] - 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.

[0740] Aspect or embodiment 39, a method for activating the set of sheetlike elements of any one of embodiments 1-16, comprising the steps of:

[0741] j) mixing the alkaline component with water to obtain an aqueous alkaline component comprising the base and water, and

[0742] k) applying the aqueous alkaline component to at least a portion of the surface of the coating layer, wherein preferably,

[0743] - 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

[0744] - the amount of the alkaline 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

[0745] - The applying step k) is performed by inkjet printing, spraying, coating and / or dripping.

[0746] 40. The method of embodiment 39, 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.

[0747] 41. The kit according to any one of embodiments 1 to 16, further comprising

[0748] - a supply device containing the sheet-like element assembly, wherein the supply device preferably comprises a roller or a magazine, or

[0749] - A food packaging comprising the sheetlike element assembly, wherein the coating layer is present within the food packaging.

[0750] 42. The kit of embodiment 41, wherein the sheet element assembly further comprises

[0751] - one or more oxygen permeable cover layers, for covering the coating layer, preferably selected from oxygen permeable film layers, fibrous material layers and nonwoven fabric layers, and / or

[0752] - 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.

[0753] 43. A supply device comprising the activated sheetlike elements according to any one of embodiments 17 to 19, wherein the supply device protects the activated sheetlike elements from the influence of oxygen and preferably comprises a roll, a stack, a magazine or a package, such as a box.

[0754] Aspect or embodiment 44. Food packaging comprising the activated sheetlike element of any one of embodiments 17-19, wherein the coating layer is present within the food packaging.

[0755] Aspect or embodiment 45. Use of the kit according to any one of embodiments 1 to 16 or the activated sheetlike element according to any one of embodiments 17 to 19 in food packaging.

[0756] Aspect or embodiment 46. Use of a kit according to any one of embodiments 1 to 16 or an activated sheetlike element according to any one of embodiments 17 to 19 for extending the shelf life of food.

[0757] Aspect or embodiment 47. A packaged food comprising a food and a food packaging having an activated sheetlike element according to any one of embodiments 17-19, wherein the coating layer of the activated sheetlike element is present within the food packaging.

[0758] Aspect or embodiment 48, a packaged food according to embodiment 47, wherein the food is selected from liquid and solid foods, preferably oxygen-sensitive foods, including raw and processed meat, poultry, beef, pork, ham, sausage, dried meat, raw and processed fish, dairy products, bakery products, snacks, nuts and oilseeds, vegetables; candy, ready-to-eat foods and beverages, especially orange juice.

Claims

1. A kit for improving the shelf life of food, the kit comprising a) a sheet element assembly having a1) a coating layer, the coating layer comprising i) a particulate filler in an amount of 25-70% by weight, based on the total dry weight of the coating layer, wherein the particulate filler comprises more than 50% by weight of a mineral, based on the total amount of the filler, the mineral being preferably an alkaline earth metal mineral, a silicate or a mixture thereof, Wherein the mineral is not surface-reacted calcium carbonate, 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 + Ion donors are generated in situ and / or supplied from external sources. 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 hydrogen, hydroxy, alkoxy, aryloxy, amino, alkyl, aryl and -YR 1 group, preferably, wherein R is -YR 1 Group, where -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 -R 1 is an alkoxycarbonyl group, an aryloxycarboxyl group, a carboxyl group or a substantially completely deprotonated carboxyl group, and a2) basal layer, and b) a basic component comprising a b Value of base.

2. The kit of claim 1, wherein the sheet element assembly comprises a coating layer, the coating layer - 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 - 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 0.1-0.4cm 3 / g, and / or - have 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 0.1-0.3cm 3 / g, and / or -Having 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 -1-200g / m 2 , preferably 2-150g / m 2 , more preferably 10-120g / m 2 An amount of is present on the base layer.

3. A kit according to any one of the preceding claims, wherein the particulate filler comprises at least 70% by weight, preferably at least 90% by weight, of the mineral, based on the total weight of the particulate filler.

4. The kit according to any one of the preceding claims, wherein the mineral is not a calcium carbonate other than ground natural calcium carbonate and precipitated calcium carbonate, more preferably the mineral is not a calcium carbonate other than ground natural calcium carbonate.

5. The kit according to any one of the preceding claims, wherein the mineral is an alkaline earth metal mineral, preferably selected from the group consisting of alkaline earth metal carbonates, alkaline earth metal phosphates, alkaline earth metal sulfates, alkaline earth metal oxides, alkaline earth metal hydroxides and mixtures thereof, More preferably, the alkaline earth metal mineral is selected from carbonates, phosphates, sulfates, oxides, hydroxides and mixtures thereof of calcium and / or magnesium, Even more preferably, the alkaline earth metal mineral is selected from calcium carbonate, magnesium carbonate and mixtures thereof, and Most preferably, the alkaline earth metal mineral is selected from precipitated hydromagnesite, ground natural calcium carbonate and precipitated calcium carbonate.

6. A kit according to any one of the preceding claims, wherein the mineral is a silicate selected from aluminosilicates, alkaline earth metal containing silicates and mixtures thereof, and more preferably selected from zeolites, perlite, kaolin, bentonite, calcined clay and mixtures thereof.

7. A kit according to any preceding claim, wherein the mineral has - Specific surface area measured by BET method according to ISO 9277:2010 is 20-200m 2 / g, preferably 50-120m 2 / g, and / or - 0.1-2.5 cm 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 / g range of total intra-particle intrusive specific pore volume, and / or - 0.1-6 cm measured by mercury intrusion porosimetry 3 / g, preferably 1-5cm 3 / g, more preferably 2-5cm 3 / g and most preferably 2.5-5cm 3 / g range of total intrusive specific pore volume.

8. A kit according to any one of the preceding claims, wherein the at least one oxygen scavenger is chosen from phenolic acids with at least two phenolic hydroxyl groups arranged in ortho or para position relative to each other, cinnamic acid with at least two phenolic hydroxyl groups arranged in ortho or para position relative to each other, derivatives thereof and mixtures of the foregoing, Preferably, wherein the at least one oxygen scavenger is selected from gallic acid, digallic acid, protocatechuic acid, caffeic acid, 5-hydroxyferulic acid, gentisic acid, erotic acid, chebulic acid, phloroglucinol carboxylic acid, chicoric acid, derivatives thereof and mixtures thereof, even more preferably, 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 completely deprotonated acids of the corresponding acids, And most preferably, the at least one oxygen scavenger is substantially completely deprotonated gallic acid, and / or - 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.

9. The kit of any one of the preceding claims, 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.

10. The kit according to any one of the preceding claims, wherein the alkaline component is an aqueous alkaline component comprising the base and water, wherein preferably - 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 - 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.

11. The kit of any one of the preceding claims, wherein the sheet element assembly further comprises - one or more oxygen permeable cover layers, for covering the coating layer, preferably selected from oxygen permeable film layers, fibrous material layers and nonwoven fabric layers, and / or - 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.

12. An activated sheetlike element formed from the kit according to any one of the preceding claims 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 - 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 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.

13. A method of making a kit for improving the shelf life of food, the method comprising the steps of: a) providing a particulate filler, the particulate filler comprising more than 50% by weight of a mineral, based on the total amount of the filler, the mineral preferably being an alkaline earth metal mineral, a silicate or a mixture thereof, Where the mineral is not surface-reacted calcium carbonate, The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated 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 + Ion donors are generated in situ and / or supplied from external sources. 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, where -Y is selected from a direct bond, a linear or branched alkylene group having 1 to 6 carbon atoms and -CH=CH- group, preferably, Y is a direct bond, and -R 1 is an alkoxycarbonyl group, an aryloxycarboxyl group, a carboxyl 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) onto 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, h) providing a basic component comprising a b value of base, and optionally i) mixing the alkaline component of step h) with water to obtain an aqueous alkaline component comprising the base and water, wherein 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, and / or - 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.

14. A method for manufacturing a sheet element assembly, the method comprising the steps of: a) providing a particulate filler, the particulate filler comprising more than 50% by weight of a mineral, based on the total amount of the filler, the mineral preferably being an alkaline earth metal mineral, a silicate or a mixture thereof, Where the mineral is not surface-reacted calcium carbonate, The surface-reacted calcium carbonate is natural ground calcium carbonate or precipitated 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 + Ion donors are generated in situ and / or supplied from external sources. 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, where -Y is selected from a direct bond, a linear or branched alkylene group having 1 to 6 carbon atoms and -CH=CH- group, preferably, Y is a direct bond, 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 the 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, where -Y is selected from a direct bond, a linear or branched alkylene group having 1 to 6 carbon atoms and -CH=CH- group, preferably, Y is a direct bond, 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.

15. The process of claim 14, wherein the alkaline compound of step b2) is selected from the group consisting of carbonate bases, hydroxide bases, bicarbonate bases, amine bases and mixtures thereof, and more 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.

16. A method for activating a nested sheetlike element according to any one of claims 1 to 11, 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, wherein preferably, - 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 - 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 - The applying step k) is performed by inkjet printing, spraying, coating and / or dripping.

17. The kit of any one of claims 1 to 11, further comprising - a supply device containing the sheet-like element assembly, wherein the supply device preferably comprises a roller or a magazine, or a food packaging comprising the sheetlike element assembly, wherein the coating layer is present within the food packaging, Preferably, the sheet element assembly further comprises - one or more oxygen permeable cover layers, for covering the coating layer, preferably selected from oxygen permeable film layers, fibrous material layers and nonwoven fabric layers, and / or - 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.

18. A supply device comprising the activated sheet-like elements of claim 12, 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.

19. Food packaging comprising the activated sheetlike element of claim 12, wherein the coating layer is present within the food packaging.

20. A food package according to claim 19, wherein the food package contains a food or food, wherein the food is selected from liquid and solid foods, preferably oxygen sensitive foods, including raw and processed meat, poultry, beef, pork, ham, sausages, dried meat, raw and processed fish, dairy products, bakery products, snacks, nuts and oilseeds, vegetables; confectionery, ready-to-eat foods and beverages, especially orange juice.

21. Use of a kit according to any one of claims 1 to 11 or an activated sheetlike element according to claim 12 in food packaging, preferably for extending the shelf life of food.

22. A packaged food product comprising a food product and a food product packaging having an activated sheetlike element according to claim 12, wherein a coating layer of the activated sheetlike element is present within the food product packaging.

23. A packaged food product according to claim 22, wherein the food product is selected from liquid and solid foods, preferably oxygen sensitive foods, including raw and processed meat, poultry, beef, pork, ham, sausages, dried meat, raw and processed fish, dairy products, bakery products, snacks, nuts and oilseeds, vegetables; confectionery, ready-to-eat foods and beverages, especially orange juice.

Images