Porous coating containing minerals and oxygen scavengers for improving the shelf life of food

Abstract

The present invention relates to a kit for improving the shelf life of a food product comprising a sheet-like element component and an alkali component. The sheet-like element component comprises a granular filler containing minerals, a binder, and an oxygen scavenger. The oxygen scavenger is a compound containing at least two phenolic hydroxyl groups that can be deprotonated by the alkali component to activate the oxygen scavenger. Further aspects of the present invention relate to an activated sheet-like element formed from the kit of the present invention, a method of manufacturing a kit for improving shelf life, a method of manufacturing a sheet-like element component, a method for activating a sheet-like element component, a supply device comprising an activated sheet-like element, a food package comprising an activated sheet-like element, and the use of a kit or an activated sheet-like element within a food package and for extending the shelf life of a food product.

Description

Technical Field

[0001] The present invention relates to a kit for improving the shelf life of a food product comprising a sheet-like element component and an alkali component, an activated sheet-like element formed therefrom, their use, a method for manufacturing a kit for improving the shelf life, and a method for manufacturing a sheet-like element component.

Background Art

[0002] The presence of oxygen in a food package can adversely affect the quality of various oxygen-sensitive food products. For example, the presence of oxygen in a food package is typically associated with a loss of flavor in freshly brewed products such as coffee and nuts, as well as in spices and flavored foods. Furthermore, oxygen causes the decomposition of vitamins such as vitamins A, C, and E, and of red pigments in berries, sauces, and meat products. It also similarly promotes the growth of potentially harmful aerobic bacteria, promotes the growth of mold in cheese, other dairy products, and bakery products, accelerates the browning of fruits and vegetables, and causes the rancidity of fats and oils. In juices such as orange juice, oxygen contributes to the decomposition of vitamin C. Thus, the presence of oxygen in a food package is harmful to the edibility, nutritional value, texture, aroma, and color of food products, which reduces consumer acceptance and the shelf life of the food. The food industry must further adapt to the consumer demand for minimally processed food products that contain little or no additives or preservatives, while at the same time maintaining an acceptable or even longer shelf life. This indicates an additional requirement that any technical solution for extending the arbitrarily provided shelf life must not require a complex packaging system, i.e., the means for extending the shelf life must be easy to incorporate into the packaging system.

[0003] To reduce the amount of oxygen present in a food package, various technical approaches are known. For example, vacuum packaging, modified atmosphere packaging (MAP; also referred to as gas replacement packaging), the use of oxygen-impermeable food packages, or the use of oxygen scavenging elements are known. 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, the residual oxygen concentration in the package atmosphere can remain at 5% by volume due to oxygen contained in the food matrix, oxygen permeation through the package material, or insufficient sealing of the food package. The combined use of an oxygen scavenger and MAP can provide a desirable low residual oxygen level (preferably less than 0.5% by volume or even less than 0.1% by volume) within the food package.

[0004] Oxygen scavenging elements are known in the prior art in the form of sachets, carriers, plastic films, labels, or plastic trays. However, sachets can accidentally rupture and spoil food products with the stored oxygen scavenger or be regarded as a "foreign object" and cause the food package to be unacceptable. Thus, sachets are not common, for example, in European countries. Alternatively, the oxygen scavenger can be integrated into the package material. However, normal film processing techniques such as casting, extrusion pressing, or pressing are typically carried out at high temperatures, for example, about 200°C. At these temperatures, the stability of the oxygen scavenger can be adversely affected. Furthermore, the oxygen scavenger integrated into the film may be inaccessible to the contained oxygen, and its oxygen scavenging activity may be impaired.

[0005] Carriers for oxygen scavengers are technically known. For example, European Patent Application Publication No. 1 550 506 A1 discloses a carrier for an oxygen scavenger based on activated carbon and calcium silicate. European Patent Application Publication No. 3 192 850 A1 and International Publication No. 2017 / 121675 A1 relate to calcium carbonate-based carriers for oxygen scavenging compounds.

[0006] Most commonly, oxygen scavengers are based on iron powder stored in sachets. However, there are numerous problems associated with it. Sachets containing iron pose a health risk to consumers due to accidental ingestion, cannot be used for liquid products, may catch fire when heated in a microwave oven, and are detected by metal detectors within the packaging line. Furthermore, the presence of moisture is required to activate the iron. Thus, the use of iron-containing oxygen scavengers is typically limited to food packages whose atmosphere contains at least 65% relative humidity (rH). For use at lower humidities, hygroscopic sodium chloride has to be added, however, this will ultimately dry out the food product and thus promote food quality deterioration.

[0007] Alternatively, palladium-based oxygen scavengers have been proposed, but these are expensive and are deactivated particularly by sulfur components found in meat products. Furthermore, the maximum allowable amount of H2 in the package limits the labeling ability of such types of scavengers. Sulfite-based oxygen scavengers may contribute to the deterioration of the odor and aroma of food products, while aluminum-based oxygen scavengers are prone to inactivation. In addition, oxidizable polymers have been proposed as oxygen scavengers.

[0008] Furthermore, natural compounds such as polyphenols, plant extracts, tocopherols and ascorbic acid have been proposed as oxygen scavengers for application to food packages. For example, Ahn et al. (Journal of Applied Polymer Science, 2016, 44138 doi:10.1002 / app.44138) described that an LDPE film co-extruded with an oxygen scavenging system consisting of gallic acid (2,3,4-trihydroxybenzoic acid) and potassium carbonate adsorbed oxygen from ambient air at 95% rH. Similarly, Pant et al. (Materials, 2017, 10, 489, doi:10.3390 / ma10050489) disclosed that a thermoformed tray having a biopolyethylene layer containing gallic acid and sodium carbonate adsorbed oxygen from an oxygen / nitrogen mixture (20 / 80% by volume) at a relative humidity of 75% rH or higher. Similarly, European Patent Application Publication No. 2 305 375 A1 relates to an oxygen-absorbing film containing a thermoplastic polymer, gallic acid, a transition metal compound and optionally an alkali carbonate. Korean Patent No. 101935245 B1 relates to an oxygen scavenging film containing polyethylene, a phenolic compound and a sodium salt. Japanese Patent Application Laid-Open No. 10-15385 relates to an oxygen-absorbing resin containing a polymer, gallic acid and sodium carbonate.

[0009] However, prior art polyphenol-based oxygen scavenger elements are limited in their application at high humidity. Furthermore, the inventors have surprisingly found that prior art polyphenol-based oxygen scavengers are inactivated by the presence of carbon dioxide, rendering them unsuitable for MAP applications. However, MAP is a very common technique in, for example, the application of meat packaging, where a low residual oxygen level is particularly desirable, thereby reducing food discoloration and microbial contamination.

[0010] The unpublished patent application PCT / EP2022 / 051345 relates to a sheet-like element having a coating layer containing an oxygen scavenger such as gallic acid, a binder, and surface-reacted calcium carbonate. This sheet-like element efficiently scavenges oxygen after the application of an aqueous alkaline component.

SUMMARY OF THE INVENTION

PROBLEMS TO BE SOLVED BY THE INVENTION

[0011] In view of the above, there is still a need for an oxygen scavenger that overcomes the above-mentioned drawbacks and is particularly safe for foods that can be compatible with low-humidity food packages and MAP.

[0012] Accordingly, an object of the present invention is to provide an oxygen scavenger that is safe for foods and effectively reduces the amount of oxygen in a food package, preferably even at low relative humidity and / or in the presence of carbon dioxide. The oxygen scavenger should be easy to handle and easy to incorporate into a food package.

MEANS FOR SOLVING THE PROBLEMS

[0013] These and other objects can be solved by the kit of the present invention, the activated sheet-like element of the present invention, the method of the present invention, the supply device of the present invention, the food package of the present invention, and the use of the present invention.

[0014] According to a first aspect of the present invention, a kit for improving the shelf life of food is provided. This kit includes: (a) A sheet-like element component having the following: (a1) A coating layer containing the following: (i) A granular filler in an amount of 25 to 70% by weight based on the total dry weight of the coating layer, where the granular filler contains a mineral that is more than 50% by weight of the total amount of the filler, preferably a mineral that is an alkaline earth metal mineral, a silicate, or a mixture thereof, The mineral is not surface-reacted calcium carbonate, The surface-reacted calcium carbonate is a reaction product of natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + ion donors, wherein the carbon dioxide is formed in situ by treatment with the H3O + ion donors and / or supplied from an external source; (ii) a polymer 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 phenyl ring having at least two phenolic hydroxyl groups and at least one R group, two of the at least two phenolic hydroxyl groups are arranged ortho or para to each other on the at least one phenyl ring, and 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 a -Y-R 1 group, preferably R is a -Y-R 1 group, wherein -Y is selected from the group consisting of a direct bond, a straight 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 aryloxycarbonyl group, a carboxyl group or an essentially fully deprotonated carboxyl group; and (a2) a substrate layer, and (b) an alkaline component containing a base having a pK b value of 6 or lower.

[0015] The inventors have surprisingly found that the coating layer of the sheet-like element of the kit of the present invention provides a specific porous structure due to the interaction of the contained compounds. The particles of the granular filler form a loose packing that includes interparticle voids and maintains the possibility of reaching the intraparticle voids (if any) of the granular filler. Alkaline earth metal minerals, silicates, and mixtures thereof have been found to be particularly desirable granular fillers. However, the use of surface-reacted calcium carbonate as the mineral is not within the scope of the present invention. Thus, the mineral is not surface-reacted calcium carbonate, and the coating layer, if any, contains less than 50% by weight of surface-reacted calcium carbonate based on the total dry weight of the coating layer. The oxygen scavenger is a polyphenol compound having the ability to react with oxygen once activated. The oxygen scavenger is disposed in the interparticle and intraparticle pores of the granular filler. The amount of the binder is selected to enable sufficient adhesion and uniform distribution of the coating layer on the substrate layer, where the pores of the granular filler remain accessible. The relative amounts of the granular filler, the binder, and the oxygen scavenger are selected such that the coating layer maintains a porous structure. Thus, an alkaline component intended to be mixed with water to form an aqueous alkaline component can be added to the sheet-like element, and the alkaline component adheres inside the pores of the coating layer, whereby the oxygen scavenger of the sheet-like element is activated by at least partial deprotonation of the phenolic hydroxyl groups. Thereafter, this activated sheet-like element can be installed in a food package to capture oxygen. Thus, the sheet-like element does not need to be hermetically shielded from moisture and / or oxygen, can be stored before its activation, and its use can be further simplified.

[0016] In addition, the coating layer is physically separated from the food product and does not contaminate the food product, unlike the powder of the porous carrier material carrying the oxygen scavenger, which tends to be scattered throughout the food package. Since it is not necessary to process the oxygen scavenger together with the polymer mixture at a high temperature in the extrusion process to incorporate the oxygen scavenger into the package, it is also avoided that the oxygen scavenger is processed at a high temperature and that part of the oxygen scavenger remains in a state where oxygen cannot reach it.

[0017] Furthermore, the inventors have found that the coating layer's ability to accept a large amount of water from the aqueous alkaline component enables improved oxygen scavenging activity even at low humidity levels. Moreover, surprisingly, it has been found that the activated sheet-like element essentially retains its oxygen scavenging activity in the presence of carbon dioxide and can be used in combination with MAP.

[0018] A second aspect of the present invention is an activated sheet-like element formed from the kit of the present invention by adding an alkaline component to the coating layer of the sheet-like element component, wherein the activated sheet-like element contains a reaction product of the at least one oxygen scavenger and the base, preferably, - adding the alkaline component in an amount of at least 0.01 molar equivalent, preferably at least 0.02 molar equivalent, more preferably at least 0.05 molar equivalent, still more preferably at least 0.1 molar equivalent, based on the molar amount of the oxygen scavenger, and / or - adding the alkaline component in an amount of 10 to 70% by weight, preferably 20 to 65% by weight, more preferably 35 to 60% by weight, based on the total weight of the coating layer, relating to the activated sheet-like element.

[0019] As outlined above, the activated sheet-like element can effectively capture oxygen even at low relative humidity and / or in the presence of carbon dioxide. Further, the inventors have found that it is sufficient to add only a relatively small sub-stoichiometric amount (i.e., a catalytic amount) of a base to the oxygen scavenger.

[0020] A third aspect of the present invention relates to a method for manufacturing a kit for improving the shelf life of food. This method includes the following steps: (a) Providing a granular filler containing more than 50% by weight of a mineral based on the total amount of the filler, preferably a granular filler containing a mineral that is 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 a reaction product of natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + ion donors, where the carbon dioxide is formed in situ by treatment with the H3O + ion donors and / or supplied from an external source; (b) Providing at least one oxygen scavenger that is a compound having at least one phenyl ring having at least two phenolic hydroxyl groups and at least one R group, where two of the at least two phenolic hydroxyl groups are located ortho or para to each other on the at least one phenyl ring, and 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 a -Y-R 1 group, preferably R is a -Y-R 1 group, where -Y is selected from the group consisting of a direct bond, a straight-chain or branched alkylene group having 1 to 6 carbon atoms, and a -CH=CH- group, preferably Y is a direct bond, and -R 1is an alkoxycarbonyl group, an aryloxycarboxyl group, a carboxyl group or an essentially fully deprotonated carboxyl group; (c) providing a polymer binder; (d) providing a substrate layer comprising one or more individual substrate layers, or a food package comprising said substrate layer; (e) mixing the oxygen scavenger of step (b), the particulate filler of step (a) and the polymer binder of step (c) in the order described herein 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 component; (h) providing an alkaline component comprising a base having a pK b value of 6 or lower; and optionally, (i) mixing the alkaline component of step (h) with water to obtain an aqueous alkaline component comprising said 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 wt% to 75 wt%, more preferably 5 wt% to 60 wt%, most preferably 10 to 35 wt% based on the total weight of the aqueous alkaline component.

[0021] In a fourth aspect of the present invention, a method for manufacturing a sheet-like element component is provided. This method includes the following steps: (a) providing a particulate filler comprising more than 50 wt% of a mineral based on the total amount of the filler, preferably a particulate filler comprising a mineral which is an alkaline earth metal mineral, a silicate, or a mixture thereof, wherein the mineral is not surface-reacted calcium carbonate, The surface-reacted calcium carbonate is a reaction product of natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + ion donors, wherein the carbon dioxide is formed in situ by treatment with the H3O + ion donors and / or supplied from an external source; (b) providing at least one oxygen scavenger which is a compound having at least one phenyl ring having at least two phenolic hydroxyl groups and at least one R group, wherein two of the at least two phenolic hydroxyl groups are located ortho or para to each other on the at least one phenyl ring, and R is a -Y-R 1 group, wherein -Y is selected from the group consisting of a direct bond, a straight 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 essentially fully deprotonated carboxyl group; (c) providing a polymer binder; (d) providing a substrate layer comprising one or more individual substrate layers, or a food package comprising the substrate layer; (e) mixing the oxygen scavenger of step (b), the particulate filler of step (a) and the polymer binder of step (c) in the order described herein 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 component; 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 phenyl ring with at least two phenolic hydroxyl groups and at least one R group, wherein two of the at least two phenolic hydroxyl groups are located ortho or para to each other on the at least one phenyl ring, and R is -Y-R 1 group, where -Y is selected from the group consisting of a direct bond, a straight 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 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.

[0022] The inventors have found that a compound having at least one phenyl ring with at least two phenolic hydroxyl groups and at least one R group can be used as the oxygen scavenger of the present invention. Advantageously, when such a compound contains a carboxyl group (-COOH), as is often the case for naturally occurring polyphenols, this carboxyl group is converted to an essentially fully deprotonated carboxyl group by reaction with a basic compound before being incorporated into the sheet-like element component of the present invention. Thereby, the interaction between the oxygen scavenger and the particulate filler and the potential degradation of the particulate filler can be minimized and / or avoided.

[0023] A fifth aspect of the present invention relates to a method of activating the sheet-like element component of the kit according to the present invention. This method includes the following steps: (j)Mixing the alkaline component with water to obtain an aqueous alkaline component containing the base and water; and (k) Applying the aqueous alkaline component to at least a part of the surface of the coating layer, where preferably, - Based on the molar amount of the oxygen scavenger, adding the alkaline component in an amount of at least 0.01 molar equivalent, preferably at least 0.02 molar equivalent, more preferably at least 0.05 molar equivalent, and even more preferably at least 0.1 molar equivalent, and / or - Based on the total weight of the coating layer, adding the alkaline component in an amount of 10 to 70% by weight, preferably 20 to 65% by weight, more preferably 35 to 60% by weight, and / or - Performing the application step (k) by inkjet printing, spraying, coating, and / or dipping.

[0024] In a sixth aspect of the present invention, a supply device including an activated sheet-like element is provided, where this supply device protects the activated sheet-like element from oxygen and preferably includes a roll, stack, magazine, or package, such as a box, etc.

[0025] The sheet-like element of the present invention can be provided in a pre-activated form, where it is protected from oxygen by the supply device of the present invention.

[0026] A seventh aspect of the present invention relates to a food package including the activated sheet-like element of the present invention, where the coating layer is present inside the food package.

[0027] An eighth aspect of the present invention relates to the use of the kit of the present invention and / or the activated sheet-like element of the present invention in a food package.

[0028] A ninth aspect of the present invention relates to the use of the kit of the present invention and / or the activated sheet-like element of the present invention for extending the shelf life of food.

[0029] Advantageous embodiments of the invention are defined in the corresponding dependent claims.

Brief Description of the Drawings

[0030]

Figure 1

Mode for Carrying Out the Invention

[0031] For the purposes of the present invention, it should be understood that the following terms have the following meanings.

[0032] A "kit suitable for improving the shelf life of food" means a kit and its components that, when installed in a food package, do not adversely affect the edibility of the foodstuffs contained within the food package. Accordingly, any compound used in the sheet-like element of the present invention is a compound that is safe for use in food, i.e., a compound that does not release any amount or any significant amount of toxic or harmful substances or pathogenic microorganisms into the foodstuffs.

[0033] "Improving the shelf life of food" should be understood broadly as meaning that at least one of the characteristics of the foodstuffs within the food package, preferably texture, color, taste, nutritional value, and / or edibility, is maintained for a longer period compared to the same foodstuffs within the same food package that does not contain the activated sheet-like element of the present invention. The terms "improve", "extend", or "increase" the shelf life of food are used synonymously herein.

[0034] "Pathogenic microorganisms" are understood to be at least one bacterial strain, and / or at least one yeast strain, and / or at least one mold strain that may be present in foodstuffs and that can cause foodborne illnesses when ingested.

[0035] The "surface-reacted calcium carbonate" according to the present invention is a reaction product obtained by treating natural ground calcium carbonate (GNCC) or precipitated calcium carbonate (PCC) with carbon dioxide and one or more H3O + ion donors, where this carbon dioxide is formed in situ by treatment with the H3O + ion donor and / or supplied from an external source. The surface-reacted calcium carbonate can be obtained as disclosed in patent application PCT / EP2022 / 051345, and the content of this patent application is incorporated herein by reference with respect to the production and properties of the surface-reacted calcium carbonate. The H3O + ion donors related to the present invention are Bronsted acids and / or acidic salts. Further details about surface-reacted natural calcium carbonate are disclosed in International Publication No. 00 / 39222 A1, International Publication No. 2004 / 083316 A1, International Publication No. 2005 / 121257 A2, International Publication No. 2009 / 074492 A1, European Patent Application Publication No. 2 264 108 A1, European Patent Application Publication No. 2 264 109 A1, and US Patent Application Publication No. 2004 / 0020410 A1, and the contents of these references are incorporated herein by reference.

[0036] "Natural ground calcium carbonate" (GCC) is preferably selected from calcium carbonate-containing minerals selected from the group comprising marble, chalk, limestone, and mixtures thereof. Natural calcium carbonate may contain further naturally occurring components such as aluminosilicates.

[0037] "Precipitated calcium carbonate" (PCC) in the context of the present invention is generally a synthetic material obtained by precipitation following the reaction of carbon dioxide with calcium hydroxide in an aqueous environment, or by precipitation of calcium ions and carbonate ions from a solution, for example, by precipitation of CaCl2 and Na2CO3. Further conceivable production methods of PCC are the lime-soda process or the Solvay process where PCC is a by-product of ammonia production. Precipitated calcium carbonate exists in three primary crystal forms, namely calcite, aragonite, and vaterite crystals, and for each of these crystal forms, many different polymorphs (crystal habits) exist. Calcite has a trigonal crystal structure with typical crystal habits such as scalenohedron (S-PCC), rhombohedron (R-PCC), hexagonal prism, tabular, colloidal (C-PCC), cubic, and prismatic (P-PCC). Aragonite has an orthorhombic structure with typical crystal habits of twinned hexagonal prismatic crystals, as well as structures with various combinations of thin and elongated prisms, curved blade shapes, steeply inclined pyramid shapes, chisel-shaped crystals, dendritic, and coral-like or vermiform morphologies. Vaterite belongs to the hexagonal crystal system. The obtained PCC slurry can be mechanically dehydrated and dried.

[0038] The "particle size" of the particulate fillers and minerals herein, unless otherwise explicitly stated, is the volume-based particle size distribution d x (vol) or d x as described. Here, the d x (vol) value represents the diameter regarding that x volume % of the particles have a diameter less than d x (vol). This means, for example, that the d 20 (vol) value is such that 20 volume % of all particles have a particle size smaller than that. Thus, the d 50 (vol) value is the volume median particle size, also called the average particle size, that is, 50 volume % of all particles have a particle size smaller than that, and the d 98 (vol) value is called the volume-based top cut particle size, which is the particle size such that 98 volume % of all particles have a particle size smaller than that.

[0039] Volume median particle size d50 In this specification, it is evaluated using a Malvern Mastersizer 3000 laser diffraction system. The d 50 or d 98 value indicates a diameter value such that 50% or 98% by volume of the particles have a diameter smaller than this value. The raw data obtained by measurement is analyzed using Mie theory with a particle refractive index of 1.57 and an absorption coefficient of 0.005.

[0040] When the particle size is given in this specification as the particle size on a weight basis, for example, the d 20 (wt) value means that 20% by weight of all the particles have a particle size smaller than that particle size. Therefore, the d 50 (wt) value is the weight median particle size, that is, 50% by weight of all the particles are smaller than that particle size, and the d 98 (wt) value is called the top cut particle size on a weight basis, and 98% by weight of all the particles have a particle size smaller than that particle size.

[0041] The median particle size d 50 (wt) and the top cut d 98 (wt) are measured by the sedimentation method, which is an analysis of sedimentation behavior in the field of weight measurement. The measurement is carried out using a Sedigraph (registered trademark) 5120 of Micromeritics Instrument Corporation, USA. This method and apparatus are known to those skilled in the art and are commonly used to determine the particle size distribution. The measurement is carried out in an aqueous solution of 0.1% by weight of Na4P2O7. The sample is dispersed using a high-speed stirrer and ultrasonic treatment.

[0042] "Porosity" or "pore volume", when used in relation to granular fillers and minerals, means the intruded pore volume ratio within the particles. The terms "porosity" or "pore volume", when used in relation to the coating layer, mean the total intruded pore volume, which is the sum of the total intruded pore volume ratio within the particles, the total inter-particle intruded pore volume ratio, and the total occlusion intruded pore volume ratio. Regarding the present invention, the term "pore" refers to the space found between and / or within particles, i.e., the space formed by these particles when particles are packed together under closest contact, such as in a powder, a molded body, or a coating layer (interparticle pores) and / or the voids within porous particles (intraparticle pores), which is understood to describe a space that allows the passage of liquid under pressure when saturated with liquid and / or supports the absorption of surface-wetting liquid.

[0043] Throughout this document, the term "specific surface area" (m 2 / g, SSA) used to define granular fillers, minerals, or other materials means the specific surface area measured using the BET method (using nitrogen as the adsorbing gas) in accordance with ISO 9277:2010.

[0044] In the context of the present invention, an "oxygen scavenger" is considered to be a chemical or biological compound that has the ability to react with oxygen and thus reduce the oxygen content in the surrounding atmosphere. An "oxygen scavenging element" is considered to be a component such as a sachet, a carrier, a plastic film, a label, or a plastic tray that contains an oxygen scavenger in either or both of its non-activated and activated forms. For example, the sheet-like element components and the activated sheet-like elements of the present invention correspond to oxygen scavenging elements. "Oxygen scavenging activity" broadly means the ability of an oxygen scavenger or an oxygen scavenging element to react with oxygen and reduce the amount of oxygen in the surrounding atmosphere.

[0045] When referring to a "sheet-like element" hereinafter, this term should be understood to encompass both the sheet-like element components of the kit and the activated sheet-like elements.

[0046] "Relative humidity" means the ratio of the partial pressure of water vapor to the equilibrium vapor pressure at the storage temperature of the food product and / or the food package, for example, at approximately room temperature or a storage temperature of 5 ± 1°C.

[0047] When the term "comprising" is used in this specification and the claims, it does not exclude other unspecified elements, whether of great or little functional importance. With respect to the present invention, the term "consisting of" is considered to be one preferred embodiment of the term "comprising of". It should be understood that when a group is defined as including at least a certain number of embodiments hereinafter, this also preferably discloses a group consisting of only these embodiments. Whenever the terms "including" or "having" are used, these terms are intended to be equivalent to "comprising" as defined above.

[0048] When an indefinite or definite article, such as "a", "an" or "the", is used in reference to a singular noun, this includes the plural of that noun unless something else is specifically stated.

[0049] Terms such as "obtainable" or "definable" and "obtained" or "defined" are used interchangeably. This means, for example, that the term "obtained" does not, unless the context clearly indicates otherwise, imply that an embodiment must be obtained by the order of steps following the term "obtained", although such a limited understanding is always included as a preferred embodiment in the terms "obtained" or "defined".

[0050] When referring to preferred embodiments or technical details of the kit of the present invention above or below, to the extent applicable, it should be understood that these preferred embodiments or technical details also refer, mutatis mutandis, to the activated sheet-like element of the present invention, the method of the present invention, the supply device of the present invention, the food package of the present invention, and the use of the present invention.

[0051] Mineral The use of minerals other than surface-reacted calcium carbonate is involved in the kit of the present invention, the activated sheet-like element of the present invention, the method of the present invention, the supply device of the present invention, the food package of the present invention, and the use of the present invention.

[0052] For the purposes of the present invention, the term "mineral" is understood to be an essentially insoluble inorganic compound, preferably an essentially insoluble inorganic compound of natural origin. The term "essentially insoluble" means that the solubility product constant K in water at 25 °C sp is at most 1 × 10 -4 preferably at most 1 × 10 -5 most preferably at most 1 × 10 -6 for the compound.

[0053] Minerals suitable for use in the present invention include alkaline earth metal minerals, silicates, sulfides, metal oxides, silica, diatomaceous earth, and mixtures thereof. However, the mineral is not surface-reacted calcium carbonate, where surface-reacted calcium carbonate is the reaction product of natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + ion donors, where this carbon dioxide is formed in situ by treatment with an H3O + ion donor and / or supplied from an external source.

[0054] In one preferred embodiment of the invention, the mineral is not calcium carbonate other than ground natural calcium carbonate and precipitated calcium carbonate, and more preferably the mineral is not calcium carbonate other than ground natural calcium carbonate.

[0055] In a preferred embodiment, the mineral is selected from the group consisting of alkaline earth metal minerals, silicates, and mixtures thereof.

[0056] For the purposes of the present invention, an "alkaline earth metal mineral" is understood to be an essentially insoluble compound containing at least one type of alkaline earth metal cation. These alkaline earth metals can be beryllium, magnesium, calcium, strontium, or barium.

[0057] Preferably, the alkaline earth metal mineral is 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 the group consisting of carbonates, phosphates, sulfates, oxides, hydroxides of calcium and / or magnesium, and mixtures thereof. Even more preferably, the alkaline earth metal mineral is selected from the group consisting of calcium carbonate, magnesium carbonate, and mixtures thereof. Most preferably, the alkaline earth metal mineral is selected from the group consisting of precipitated hydromagnesite, ground natural calcium carbonate, and precipitated calcium carbonate.

[0058] Generally, the grinding of natural ground calcium carbonate may be a dry or wet grinding process. For example, under conditions such that the grinding is mainly brought about as a result of impact with a secondary body, using any conventional grinding device, that is, in one or more of a ball mill, rod mill, vibration mill, roll crusher, centrifugal impact mill, vertical bead mill, attrition mill, pin mill, hammer mill, grinder, shredder, declumper, knife cutter, or other such equipment known to those skilled in the art. When the mineral material containing calcium carbonate is a mineral material containing wet-ground calcium carbonate, the grinding process can be carried out under conditions such that autogenous grinding occurs, and / or by horizontal ball mill grinding, and / or by other such methods known to those skilled in the art. The mineral material containing wet-processed ground calcium carbonate thus obtained can be washed and dehydrated by well-known methods prior to drying, for example, by agglomeration, filtration, or forced evaporation. The subsequent drying step (if necessary) can be carried out in a one-step process such as spray drying, or in at least a two-step process. It is also common for such mineral materials to be subjected to a beneficiation process (for example, a flotation, bleaching, or magnetic beneficiation process) to remove impurities.

[0059] According to one embodiment of the present invention, the precipitated calcium carbonate is preferably precipitated calcium carbonate containing an aragonite, vaterite, or calcite mineralogical crystal form, or a mixture thereof.

[0060] Hydromagnesite, or basic magnesium carbonate, the standard industrial name for hydromagnesite, is a naturally occurring mineral found in magnesium-rich minerals such as serpentine and altered magnesium-rich igneous rocks, but is also found as a metamorphic product of brucite in periclase marble. Hydromagnesite is described as having the following formula: Mg5(CO3)4(OH)2·4H2O

[0061] Hydromagnesite is a very specific mineral form of magnesium carbonate and it should be understood that it occurs naturally as small acicular crystals, or as a crust of acicular or bladed crystals. Further, it should be noted that hydromagnesite is a distinct and unique form of magnesium carbonate, chemically, physically and structurally different from other forms of magnesium carbonate. Hydromagnesite can be readily distinguished from other magnesium carbonates by X-ray diffraction analysis, thermogravimetric analysis or elemental analysis. Unless otherwise specifically described as hydromagnesite, all other forms of magnesium carbonate (e.g., artinite (Mg2(CO3)(OH)2·3H2O), dypingite (Mg5(CO3)4(OH)2·5H2O), georgeite (Mg5(CO3)4(OH)2·5H2O), probskite (Mg2(CO3)2(OH)2·0.5H2O), magnesite (MgCO3), barringtonite (MgCO3·2H2O), lansfordite (MgCO3·5H2O) and nesquehonite (MgCO3·3H2O)) are not hydromagnesite within the meaning of the present invention and do not chemically correspond to the formulas described above.

[0062] In addition to natural hydromagnesite, synthetic hydromagnesite (or precipitated magnesium carbonate) can be prepared. For example, U.S. Patent No. 1,361,324, U.S. Patent No. 935,418, British Patent No. 548,197 and British Patent No. 544,907 generally describe the formation of an aqueous solution of magnesium bicarbonate (typically described as "Mg(HCO3)2"), which is then converted by the action of a base, such as magnesium hydroxide, to form hydromagnesite. Other methods described in the art suggest preparing a composition containing both hydromagnesite and magnesium hydroxide, where the magnesium hydroxide is mixed with water to form a suspension, which is then contacted with carbon dioxide and a basic aqueous solution to form the corresponding mixture. See, for example, U.S. Patent No. 5,979,461.

[0063] Precipitated hydro-magnesite can be prepared according to a method as disclosed in WO 2011 / 054831 A1, PCT / EP2021 / 087807, or European Patent Application No. 21 193 840.2, which are hereby incorporated by reference herein with respect to the method for producing precipitated hydro-magnesite.

[0064] It is understood that the hydro-magnesite can be one or a mixture of different types of hydro-magnesite. In one embodiment of the present invention, the hydro-magnesite comprises, preferably consists of, one type of hydro-magnesite. Alternatively, the hydro-magnesite comprises, preferably consists of, two or more types of hydro-magnesite. For example, the hydro-magnesite comprises, preferably consists of, two or three types of hydro-magnesite. Preferably, the hydro-magnesite comprises one type of hydro-magnesite, more preferably consists of one type of hydro-magnesite.

[0065] For the purposes of the present invention, "silicate" is understood to be any mineral containing orthosilicate, pyrosilicate, cyclosilicate, inosilicate or phyllosilicate moieties, or an aluminosilicate tectosilicate. It should be understood that compounds having the general formula SiO2, such as silica, calcined silica and quartz, are not considered "silicates" for the purposes of the present invention.

[0066] In a preferred embodiment, the silicate is selected from the group consisting of aluminosilicates, alkaline earth metal-containing silicates, and mixtures thereof. For example, the silicate can be selected from the group comprising mica, serpentine, clay, feldspar (e.g., nepheline syenite), feldspathoid, scapolite, amphibole, pyroxene, pyroxenoid (e.g., wollastonite), zeolite, and mixtures thereof.

[0067] In a particularly preferred embodiment, the silicate is selected from the group consisting of zeolite, perlite, kaolin, bentonite, calcined clay, and mixtures thereof.

[0068] In a preferred embodiment of the present invention, the mineral has a BET specific surface area of 20 to 200 m 2 / g, preferably 50 to 120 m 2 / g, more preferably 50 to 100 m 2 / g, as measured using nitrogen and the BET method.

[0069] Furthermore, it is more preferable that the mineral has a volume median particle size d 50 (vol) of 0.1 to 75 μm, preferably 0.5 to 50 μm, more preferably 1 to 40 μm, even more preferably 1.2 to 30 μm, and most preferably 1.5 to 15 μm.

[0070] Moreover, in some preferred cases, the mineral has a volume top cut particle size d 98 (vol) of 0.2 to 150 μm, preferably 1 to 100 μm, more preferably 2 to 80 μm, even more preferably 2.4 to 60 μm, and most preferably 3 to 30 μm.

[0071] Preferably, the mineral has an intruded ratio pore volume within the range of 0.1 to 2.5 cm 3 / g, more preferably 0.2 to 2.2 cm 3 / g, even more preferably 0.4 to 2.0 cm 3 / g, and most preferably 0.6 to 1.8 cm 3 / g, as measured by mercury porosimetry.

[0072] The intruded pore diameter of the mineral particles, as measured by mercury porosimetry, is preferably in the range of 0.004 to 1.6 μm, more preferably 0.005 to 1.3 μm, particularly preferably 0.006 to 1.15 μm, and most preferably 0.007 to 1.0 μm.

[0073] The specific pore volume is measured using the mercury intrusion porosimetry measurement method with a Micromeritics Autopore V9620 mercury porosimeter having a maximum applied pressure of mercury of 414 MPa (60,000 psi), which is equivalent to a Laplace throat diameter of 0.004 μm (about 4 nm). The equilibration time used in each pressurization step is 20 seconds. The sample material is sealed in the powder penetrometer of the chamber for analysis, 5 cm 3 for the purpose. The data is corrected for the compression of mercury, the expansion of the penetrometer, and the compression of the sample material using the software Pore-Comp (Gane, P.A.C., Kettle, J.P., Matthews, G.P. and Ridgway, C.J., "Void Space Structure of Compressible Polymer Spheres and Consolidated Calcium Carbonate Paper-Coating Formulations", Industrial and Engineering Chemistry Research, 35(5), 1996, pp. 1753-1764).

[0074] The total pore volume found in the cumulative intrusion data can be separated into two regions with intrusion data ranging from 214 μm to about 1 - 4 μm, indicating that the coarse packing of the sample between any aggregate structures contributes strongly. Below these diameters, there is fine interparticle packing of the particles themselves. If the particles also have intraparticle pores, this region is bimodal, and the intraparticle specific pore volume is defined with the specific pore volume of mercury intruded into pores thinner than the mode conversion point, i.e., thinner than the inflection point of the bimodality. The sum of these three regions gives the total pore volume of the powder, but is strongly influenced by the precipitation of the powder at the coarse pore ends of the original sample's compression / distribution.

[0075] By taking the first derivative of the integrated penetration curve, the pore size distribution based on the equivalent Laplace diameter including pore blockage is inevitably revealed. The differential curve clearly shows the pore structure region of coarse aggregates, the inter-particle pore region, and, if present, the intra-particle pore region. If the intra-particle pore size range is known, by subtracting the remaining inter-particle pore volume and the inter-aggregate pore volume from the total pore volume, it is possible to obtain only the desired pore volume of the internal pores as the pore volume per unit mass (as the specific pore volume). Naturally, the same subtraction principle also applies when separating any other pore size region of interest.

[0076] In an exemplary embodiment, the mineral has a BET specific surface area of 20 to 200 m 2 / g, preferably 50 to 120 m 2 / g, more preferably 50 to 100 m 2 / g, and a volume median diameter d 50 (vol) of 0.1 to 75 μm, preferably 0.5 to 50 μm, more preferably 1 to 40 μm, even more preferably 1.2 to 30 μm, and most preferably 1.5 to 15 μm, and is precipitated hydromagnesite.

[0077] In a particularly preferred embodiment of the present invention, the mineral is precipitated hydromagnesite, and this precipitated hydromagnesite has a BET specific surface area of 20 to 200 m 2 / g, preferably 50 to 120 m 2 / g, more preferably 50 to 100 m 2 / g, and a volume median diameter d 50 (vol) of 0.1 to 75 μm, preferably 0.5 to 50 μm, more preferably 1 to 40 μm, even more preferably 1.2 to 30 μm, and most preferably 1.5 to 15 μm.

[0078] It should be understood that the minerals described herein form interparticle pores and coarse agglomerate pores that can accept an appropriate amount of oxygen scavenger when incorporated into the coating layer of the present invention. When intraparticle pores are present, the oxygen scavenger can reach and can also accept the oxygen scavenger. Further, a portion of the aforementioned pores are in a state where the aqueous alkaline composition can reach, whereby the sheet-like element can be easily activated by applying this aqueous alkaline composition in a sufficient amount.

[0079] Granular filler The kit of the present invention, the activated sheet-like element of the present invention, the method of the present invention, the supply device of the present invention, the food package of the present invention and the use of the present invention use a granular filler. The granular filler contains a mineral in an amount exceeding 50% by weight based on the total amount of the granular filler. The mineral is as defined above, and most preferably is selected from the group consisting of precipitated hydromagnesite, ground natural calcium carbonate and precipitated calcium carbonate as defined above.

[0080] The mineral present in the granular filler in an amount exceeding 50% by weight based on the total amount of the granular filler means that the mineral is present in an amount of preferably at least 51% by weight, more preferably at least 55% by weight, and most preferably at least 60% by weight based on the total amount of the granular filler.

[0081] In a preferred embodiment of the present invention, the granular filler contains a mineral in an amount of at least 70% by weight, preferably at least 90% by weight, based on the total weight of at least one granular filler, and most preferably the granular filler consists of a mineral.

[0082] Accordingly, the particulate filler can comprise at least one further particulate filler material of less than 50% by weight, preferably at most 30% by weight, more preferably at most 10% by weight. The at least one further particulate filler material has a weight median particle size d in the range of 0.1 to 75 μm, preferably 0.5 to 50 μm, more preferably 1 to 40 μm, even more preferably 1.2 to 30 μm, and most preferably 1.5 to 15 μm. 50 Preferably has.

[0083] In another embodiment of the present invention, the particulate filler contains minerals in an amount exceeding 50% by weight based on the total amount of the particulate filler, and is selected from the group consisting of dolomite, ground calcium carbonate, precipitated calcium carbonate, magnesium hydroxide, talc, gypsum, titanium dioxide, kaolin, silicate, mica, barium sulfate, calcined clay, non-calcined (hydrous) clay, bentonite, and mixtures thereof. at least one further particulate filler material. Preferably, the at least one further particulate filler 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 at least one further particulate filler material and a mineral. Accordingly, the particulate filler preferably consists of a mineral in an amount exceeding 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 at least one further particulate filler material selected from ground calcium carbonate, precipitated calcium carbonate, and mixtures thereof. It is understood that the mineral and this at least one further particulate filler material may be the same or different materials.

[0084] According to one embodiment of the present invention, the ground calcium carbonate or precipitated calcium carbonate has a weight median particle size d of 0.05 to 10.0 μm, preferably 0.2 to 5.0 μm, more preferably 0.4 to 3.0 μm, most preferably 0.6 to 1.2 μm, particularly 0.7 μm. 50It is in the form of particles having. According to a further embodiment of the present invention, natural or precipitated calcium carbonate has a top cut particle size d on a weight basis of 0.15 to 55 μm, preferably 1 to 40 μm, more preferably 2 to 25 μm, most preferably 3 to 15 μm, particularly 4 μm 98 It is in the form of particles having.

[0085] In a preferred embodiment of the present invention, the particulate filler comprises a mineral which is an amount of precipitated hydrotalcite, ground natural calcium carbonate, precipitated calcium carbonate or a mixture thereof in an amount exceeding 50% by weight based on the total amount of the particulate filler, and dolomite, ground calcium carbonate, precipitated calcium carbonate, magnesium hydroxide, talc, gypsum, titanium dioxide, kaolin, silicate, mica, barium sulfate, calcined clay, uncalcined (hydrous) clay, bentonite and a mixture thereof. At least one further particulate filler material selected from the group consisting of: Preferably, at least one further particulate filler 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 at least one further particulate filler material and a mineral. Thus, the particulate filler preferably comprises, based on the total amount of the particulate filler, more than 50% by weight, preferably at least 70% by weight, more preferably at least 90% by weight of a mineral which is precipitated hydrotalcite, ground natural calcium carbonate, precipitated calcium carbonate or a mixture thereof, and at least one further particulate filler material selected from ground calcium carbonate, precipitated calcium carbonate and mixtures thereof.

[0086] Polymer binder The kit of the present invention, the activated sheet-like element of the present invention, the method of the present invention, the supply device of the present invention, the food package of the present invention and the use of the present invention use a polymer binder.

[0087] Any suitable polymer binder can be used for the coating layer of the present invention, where the binder according to the present invention should preferably have swellability. Those skilled in the art know how to provide suitable swellable binders, such as swellable latexes. The binder should be selected such that when there are pores within the mineral particles, it does not block them and the oxygen scavenger and the aqueous alkali component remain accessible to the pores of the surface-reacted calcium carbonate.

[0088] For example, the polymer binder can be a hydrophilic polymer such as polyvinyl alcohol, polyvinyl pyrrolidone, gelatin, cellulose ether, polyoxazoline, polyvinyl acetamide, partially hydrolyzed polyvinyl acetate / vinyl alcohol, polyacrylic acid, polyacrylamide, polyalkylene oxide, sulfonated or phosphorylated polyester, and polystyrene, casein, zein, albumin, chitin, chitosan, dextran, pectin, collagen derivative, collodion, agar, kudzu starch, guar, carrageenan, starch, tragacanth, xanthan, alginate or ramzan, and mixtures thereof. It is also possible to use other binders such as hydrophobic materials, for example, poly(styrene-co-butadiene), polyurethane latex, polyester latex, poly(n-butyl acrylate), poly(n-butyl methacrylate), poly(2-ethylhexyl acrylate), a copolymer of n-butyl acrylate and ethyl acrylate, a copolymer of vinyl acetate and n-butyl acrylate, and mixtures thereof. 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 resin, water-dilutable alkyd resin, a combination of acrylic / alkyd resin, natural oils such as linseed oil, and mixtures thereof.

[0089] In a preferred embodiment of the present invention, the polymer binder is an alkali-swellable binder. For the present invention, the alkali-swellable binder is understood to be a polymer binder that exhibits a significant increase in its Brookfield viscosity when the pH value increases. Preferably, it contains 50% by weight of the alkali-swellable binder based on the total weight of the aqueous solution, and the viscosity of the aqueous solution having a pH of 4 increases by at least 100%, preferably at least 250%, more preferably at least 500%, and most preferably at least 750% when measured with a Brookfield DV III Ultra viscometer at 100 rpm and 24 °C ± 3 °C using an appropriate spindle of the Brookfield RV-spindle set as the pH value of the aqueous solution increases from 4 to 10. A preferred alkali-swellable binder is polyacrylic acid or its salt or derivative.

[0090] According to a preferred embodiment, the polymer binder is selected from polyacrylic acid, their salts, their derivatives, starch, protein, polyvinyl alcohol, styrene-butadiene latex, styrene acrylate, polyvinyl acetate, polyolefin, ethylene acrylate, microfibrillated cellulose, microcrystalline cellulose, nanocellulose, cellulose, carboxymethyl cellulose, biolatex or a mixture thereof, more preferably, the polymer binder is selected from the group consisting of polyacrylic acid, their salts, their 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.

[0091] The polymer binder is contained in the coating layer of any one of the embodiments of the present invention in an amount of 5 to 25% by weight, preferably 10 to 20% by weight, more preferably 12 to 18% by weight based on the total dry weight of the coating layer.

[0092] A polymer binder is added in order to obtain a coating layer that spreads evenly over the substrate layer and can adhere to the substrate layer. The amount of the polymer binder to be added is selected to be high enough to enable sufficient bonding and adhesion of the layer, but low enough not to block or clog the pores within and between the mineral particles. Further, in order to improve the adhesive force, a primer layer can be provided between the substrate layer and the coating layer as described below.

[0093] Furthermore, the binder enables, for example by means of a coating process, fixing the coating layer of any one of the embodiments of the present invention on the substrate layer. Therefore, for example, the binder is selected so that the coating layer does not peel off during storage, during the loading of the aqueous alkaline component, and / or during the use of the sheet-like element or the food package.

[0094] 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, biolatex or mixtures thereof. More preferably, 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. Most preferably, the polymer binder is polyacrylic acid or its salt or derivative; and the polymer binder is contained in the coating layer of any one of the embodiments of the present invention in an amount of 5 to 25% by weight, preferably 10 to 20% by weight, more preferably 12 to 18% by weight, based on the total dry weight of the coating layer.

[0095] Oxygen scavenger The kit of the present invention, the activated sheet-like element of the present invention, the method of the present invention, the supply device of the present invention, the food package of the present invention and the use of the present invention use an oxygen scavenger. The oxygen scavenger is a compound having at least one phenyl ring having at least two phenolic hydroxyl groups and at least one R group, where two of the at least two phenolic hydroxyl groups are arranged on at least one phenyl ring in the ortho or para position relative to each other, and R is a hydrogen atom, a hydroxyl group, an alkoxy group, an aryloxy group, an amino group, an alkyl group, an aryl group and -Y-R 1 group selected from the group consisting of. Here, - Y is selected from the group consisting of 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, - R 1 is an alkoxycarbonyl group, an aryloxycarbonyl group, a carboxyl group or an essentially completely deprotonated carboxyl group. Particularly preferably, R 1 is an essentially completely deprotonated carboxyl group.

[0096] In a particularly preferred embodiment, R is a -Y-R 1 group as defined above.

[0097] "Phenolic hydroxyl group" means a hydroxyl group (-OH) directly bonded to an aryl ring.

[0098] Regarding the present invention, two substituents arranged on the phenyl ring in the "ortho position" mean that these two substituents are bonded to the phenyl ring at the 1,2-position relative to each other. Similarly, two substituents arranged on the phenyl ring in the "para position" mean that these two substituents are bonded to the phenyl ring at the 1,4-position relative to each other. This relative position of the phenolic hydroxyl groups ensures that the oxygen scavenger is easily oxidizable because a quinoid system can be formed.

[0099] The -CH=CH- group may be in the cis or trans configuration or a mixture thereof, preferably in the trans configuration.

[0100] The amino group in the context of the present invention is the functional group -NH2, where optionally one or both of the hydrogen atoms are substituted by one or two organyl groups independently selected from each other.

[0101] The alkyl group in the context of the present invention means a straight-chain or branched saturated organic compound composed of carbon and hydrogen having 1 to 28 carbon atoms, preferably 8 to 26 carbon atoms, more preferably 14 to 22 carbon atoms, and most preferably 16 to 20 carbon atoms.

[0102] The aryl group in the context of the present invention is a phenyl group optionally further substituted by one or more organyl groups and / or one or more functional groups.

[0103] The "organyl group" in the context 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).

[0104] The "functional group" means any substituent other than hydrogen, halide, or organyl group, especially a hydroxyl group, an amino group, a thiol group, an organyloxy group, an organylthio group, a phosphonic acid group, a phosphine group, and a sulfonic acid group.

[0105] The "alkoxycarbonyl group" means a -C(=O)-O-R 2 group, where R 2 represents an alkyl group, more preferably a methyl, ethyl, propyl, butyl, 2-ethylhexyl, octyl, or dodecyl group.

[0106] "Aryloxycarbonyl group" means -C(=O)-O-R 3 group, and R 3 represents an aryl group, preferably a phenyl group.

[0107] "Carboxyl group" means -C(=O)-O-H group.

[0108] "Essentially completely deprotonated" carboxyl group means a group derived from a free carboxylic acid (-C(=O)-OH), where the hydrogen atom is essentially completely replaced by a counterion, for example, by reaction with a base. The term "essentially completely replaced" or "essentially 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 this counterion. An essentially completely deprotonated carboxyl group can be denoted as -C(=O)-O(H / M), where M represents the counterion.

[0109] The counterion is preferably selected from the group consisting of ammonium ion, sodium ion, lithium ion, potassium ion, cesium ion, magnesium ion, calcium ion, and mixtures thereof, more preferably a cation preferably selected from the group consisting of sodium ion, potassium ion, calcium ion, magnesium ion, and mixtures thereof, and most preferably calcium cation.

[0110] For the purposes of the present invention, ammonium ion means an ion selected from the group consisting of NH4 + , primary ammonium ion, secondary ammonium ion, tertiary ammonium ion, and quaternary ammonium ion, preferably NH4 + .

[0111] In other words, at least one oxygen scavenger of the present invention is a compound conforming to one of the following two formulas (1) and (2): [Chemical formula] In the formula, A 1 , A 2 , A 3 and A 4 are independently selected from the group consisting of hydrogen, a halide group, an organyl group, and a functional group, and / or two adjacent groups among A 1 ~A 4 are bonded to form a condensed ring, where at least one of A 1 ~A 4 is R defined as above.

[0112] The halide group in the context of the present invention is a fluorine group, a chlorine group, a bromine group, and an iodine group.

[0113] The condensed ring is understood to be a new ring formed from two adjacent groups, which means a ring sharing two carbon atoms and one bond with the phenyl ring shown in formula (1) or (2). Preferably, these two adjacent groups are selected from the group consisting of -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-.

[0114] Preferably, at least one oxygen scavenger of the present invention is a compound conforming to formula (1) or (2), where A 1 , A 2 , A 3 and A 4 are independently selected from the group consisting of hydrogen, a hydroxyl group, an alkoxy group, and an alkyl group, provided that at least one of A 1 ~A 4 is R defined as above. The alkyl group is preferably a methyl group, and the alkoxy group is preferably a methoxy group.

[0115] When the oxygen scavenger contains a carboxyl group, such a carboxyl group can react with a basic mineral such as a carbonate. In such an embodiment, it is possible to form what is essentially completely deprotonated. Thus, when the mineral can react with the carboxylic acid group, for example, when the mineral is calcium carbonate, R 1 is particularly preferably a carboxyl group that is essentially completely deprotonated. In other words, before forming the coating layer of the present invention, it is preferable that the carboxylic acid group is deprotonated, for example, by a process as described below.

[0116] In a preferred embodiment, at least one oxygen scavenger is selected from the group consisting of phenolic acids having at least two phenolic hydroxyl groups arranged ortho or para to each other, cinnamic acids having at least two phenolic hydroxyl groups arranged ortho or para to each other, derivatives thereof, and mixtures thereof.

[0117] "Phenolic acid" in the context of the present invention is an aromatic compound containing a carboxylic acid group bonded to an aryl ring and at least one phenolic hydroxyl group. "Cinnamic acid" in the context of the present invention contains a 3-phenylprop-2-enoic acid skeleton.

[0118] Thus, "a phenolic acid having at least two phenolic hydroxyl groups arranged ortho or para to each other" is a compound having at least one phenyl ring having at least two phenolic hydroxyl groups and at least one group R, and two of these at least two phenolic hydroxyl groups are arranged ortho or para to each other on this at least one phenyl ring, and R is -Y-R 1 group, where Y is a direct bond, and R 1 is an alkoxycarbonyl group, an aryloxycarbonyl group, a carboxyl group, or a carboxyl group that is essentially completely deprotonated.

[0119] Similarly, "cinnamic acid having at least two phenolic hydroxyl groups arranged ortho or para to each other" is a compound having at least one phenyl ring with at least two phenolic hydroxyl groups and at least one group R, and two of these at least two phenolic hydroxyl groups are arranged ortho or para to each other on this at least one phenyl ring, and R is -Y-R 1 group, where Y is a -CH=CH- group, and R 1 is an alkoxycarbonyl group, an aryloxycarbonyl group, a carboxyl group, or an essentially fully deprotonated carboxyl group.

[0120] In a preferred embodiment, at least one oxygen scavenger is selected from the group consisting of 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-dihydroxybenzoic acid), orsellinic acid (2,4-dihydroxy-6-methylbenzoic acid), kebrinic acid ((2R)-2-[(3S)-3-carboxy-5,6,7-trihydroxy-1-oxo-3,4-dihydroisochromen-4-yl]butanedioic acid), phloroglucinolcarboxylic acid (2,4,6-trihydroxybenzoic acid), chicoric acid ((2R,3R)-2,3-bis{[(E)-3-(3,4-dihydroxyphenyl)prop-2-enoyl]oxy}butanedioic acid), their derivatives, and mixtures thereof

[0121] Thus, in a particularly preferred embodiment, 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 (2,5-dihydroxybenzoic acid) derivatives, orsellinic acid (2,4-dihydroxy-6-methylbenzoic acid) derivatives, keblinic acid ((2R)-2-[(3S)-3-carboxy-5,6,7-trihydroxy-1-oxo-3,4-dihydroisochromen-4-yl]butanedioic acid) derivatives, phloroglucinol carboxylic acid (2,4,6-trihydroxybenzoic acid) derivatives, chicoric acid ((2R,3R)-2,3-bis{[(E)-3-(3,4-dihydroxyphenyl)prop-2-enoyl]oxy}butanedioic acid) derivatives, and mixtures thereof.

[0122] The term "acid derivative" in this context means that at least one oxygen scavenger contains an alkoxycarbonyl group, an aryloxycarbonyl group, or an essentially fully deprotonated carboxyl group of the acid described above, i.e., the acid derivative is selected from the group consisting of alkyl esters, aryl esters, and essentially fully deprotonated acids of the respective acids.

[0123] More preferably, at least one oxygen scavenger is a gallic acid derivative, preferably selected from the group consisting of essentially fully deprotonated gallic acid, ethyl gallate, propyl gallate, octyl gallate, and dodecyl gallate, and most preferably essentially fully deprotonated gallic acid. Gallic acid derivatives are safe for use in food and are approved under E numbers E310 - E313 in the European Union.

[0124] Accordingly, in an exemplary embodiment of the present invention, at least one oxygen scavenger is an essentially fully deprotonated gallic acid containing a cation, where the cation is preferably selected from the group consisting of ammonium ions, sodium ions, lithium ions, potassium ions, cesium ions, magnesium ions, calcium ions, and mixtures thereof, preferably a cation preferably selected from the group consisting of sodium ions, potassium ions, calcium ions, magnesium ions, and mixtures thereof, and most preferably a calcium cation.

[0125] Base layer The kit of the present invention, the activated sheet-like element of the present invention, the method of the present invention, the supply device of the present invention, the food package of the present invention, and the use of the present invention use a substrate layer.

[0126] The coating layer of the present invention is fixed on the substrate layer by an application process as described, for example, below. The coating layer according to the present invention is fixed so as not to delaminate, for example, during storage, the loading of aqueous alkaline components, and / or the use of the sheet-like element. A person skilled in the art knows how to match a given substrate layer with the coating layer of the present invention by selecting an appropriate polymer binder as described above and / or providing a primer layer as described below. Accordingly, the present invention is not limited to any particular substrate layer.

[0127] The substrate layer includes one or more individual substrate layers, that is, the substrate layer may have a single-layer or multi-layer structure. When the substrate layer includes two or more individual substrate layers, the individual substrate layers may be made of the same or different materials. There is no limitation on the thickness of one substrate layer and / or a plurality of individual substrate layers. For example, one substrate layer can have a thickness within the range of 1 μm to 10 mm, preferably 10 μm to 1 mm, more preferably 20 μm to 0.5 mm, for example 50 to 150 μm. For example, a plurality of individual substrate layers can have a thickness within the range of 1 μm to 10 mm, preferably 10 μm to 1 mm, more preferably 20 μm to 0.5 mm, for example 50 to 150 μm.

[0128] In a preferred embodiment of the present invention, one or more individual substrate layers selected are selected from the group consisting of polymer material layers. Suitable polymer materials are those listed in Title 21, Chapter 177 of the Code of Federal Regulations (CFR).

[0129] Preferably, the polymer material layer is made of polyethylene, polypropylene, polyethylene terephthalate, polylactic acid, polyhydroxybutyric acid, polyethylene-2,5-furandicarboxylate or polystyrene, a fiber material layer, more preferably a fiber material layer made of viscose, cellulose acetate, polypropylene or polyethylene terephthalate, a paper layer, a cardboard layer, a textile layer, a non-woven fabric layer, a layer made of a biomaterial, a wood layer, a bamboo layer, a metal foil layer, an aluminum layer, a printing receptive coating layer, and a mixture of the above. One or more individual substrate layers are optionally subjected to corona treatment.

[0130] In a particularly preferred embodiment of the present invention, one or more individual substrate layers are polymer material layers. The polymer material layer can be provided in the form of a sheet or film. The polymer material layer may be made of any polymer material of natural or synthetic origin, preferably polyethylene (e.g., linear low density polyethylene, low density polyethylene or high density polyethylene), polypropylene, polycarbonate, polyvinylidene dichloride, polymethyl methacrylate, biaxially oriented polypropylene, a copolymer of ethylene and propylene, polystyrene, polyester (e.g., polyethylene terephthalate, a copolymer of ethylene terephthalate and ethylene isophthalate, polyethylene naphthalate, polylactic acid, polyhydroxybutyric acid, polyethylene-2,5-furandicarboxylate), biaxially oriented polyester (e.g., biaxially oriented polyethylene terephthalate), polyvinyl chloride, cellulose acetate, cellophane or a mixture thereof, more preferably the polymer material layer is made of polyethylene, polypropylene, polyethylene terephthalate, polylactic acid, polyhydroxybutyric acid, polyethylene-2,5-furandicarboxylate, polystyrene or a mixture thereof.

[0131] The polymer material layer can be manufactured 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. A substrate layer containing two or more individual polymer material layers can be manufactured by a lamination process or an extrusion coating process. A substrate layer containing at least one individual polymer material layer and at least one different individual substrate layer can be manufactured by a coating process or a lamination process, and when at least one different individual substrate layer is made of metal, it can be manufactured by a vapor deposition process.

[0132] In another embodiment of the present invention, one or more individual substrate layers are fibrous material layers. The fibrous material layer may be, for example, a woven layer, a textile layer or a fabric layer formed from filaments, yarns, twisted yarns or staple fibers by weaving, knitting, braiding, crocheting, knotting, or felting. For example, the individual substrate layer may be a non-woven fabric layer. The production of the non-woven fiber layer includes web forming processes such as dry laying, air laying, wet laying, spun laying, melt blowing, and submicron spinning, and web bonding processes such as calendering, air-through bonding, needle punching, hydro entanglement, stitch bonding, and chemical bonding, and optionally includes finishing processes such as embossing, stretching, perforating, crimping, or coating.

[0133] The fibrous material layer may 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 mixtures thereof, and preferably, the fibrous material layer may be made of viscose, cellulose acetate, polypropylene, polyethylene terephthalate, polylactic acid or mixtures thereof.

[0134] In yet another embodiment of the present invention, one or more individual substrate layers are paper layers or cardboard layers. The paper layer or cardboard layer includes, for example, cellulose fibers formed from wood pulp and may further include, for example, additives listed in Title 21, Chapter 176 of the Code of Federal Regulations (CFR).

[0135] In yet another embodiment, one or more individual substrate layers are layers made of bio-based materials. For the purposes of the present invention, the term "bio (bio-based)" material is defined in accordance with European Standard EN 16575:2014 and relates to materials derived from biomass, i.e., materials of biological origin excluding materials embedded in geological formations and / or fossilized substances. In the production of bio-based materials, the biomass may have undergone physical, chemical, or biological treatment. Accordingly, suitable layers include wood layers, bamboo layers, paper layers, cardboard layers, and layers made of biopolymers such as polylactic acid, polybutylene succinate, or polyhydroxybutyric acid.

[0136] In yet another embodiment of the present invention, one or more individual substrate layers are metal foil layers, such as tin layers or aluminum layers. The metal foil layer can be formed by forging or rolling, or can be deposited on different individual substrate layers by physical vapor deposition.

[0137] In one embodiment of the present invention, one or more individual substrate layers are printing-receptive coating layers. The printing-receptive coating can include inorganic pigments such as calcium carbonate or kaolin, and a binder such as the polymer binder described above. Optionally, the printing-receptive coating layer can include a cationic dye fixative such as a water-soluble metal salt, preferably sodium chloride, aluminum sulfate, calcium chloride, or magnesium chloride, or polydimethyldiallylammonium chloride. Accordingly, patterns, logos, text, or other information can be printed on the sheet-like element, for example, by offset printing or inkjet printing. Preferably, the ink-receptive coating layer is located on the sheet-like element on the opposite side of the coating layer.

[0138] The base layer can be evenly coated with the coating layer of the present invention. Therefore, regardless of the material of the food package, optimal adhesion of the coating layer to the base layer can be achieved. The sheet-like element component thus obtained can carry an aqueous alkaline component and can be roughly installed, for example, in a food package. Furthermore, the base layer enables "additional functionality" of the sheet-like element, such as, for example, receiving additional print information, receiving an adhesive layer for reversible or irreversible fixation of the sheet-like element within the food package, or receiving a spoilage indicator label.

[0139] Coating layer The kit of the present invention, the activated sheet-like element of the present invention, the method of the present invention, the supply device of the present invention, the food package of the present invention and the use of the present invention employ a coating layer.

[0140] The coating layer contains a particulate filler in an amount of 25 to 70% by weight based on the total dry weight of the coating layer, a polymer binder in an amount of 5 to 25% by weight based on the total dry weight of the coating layer, and at least one oxygen scavenger in an amount of 25 to 70% by weight based on the total dry weight of the coating layer. The particulate filler contains a mineral in an amount exceeding 50% by weight based on the total amount of the particulate filler.

[0141] It is recognized that the particulate filler, the mineral, the at least one oxygen scavenger and the polymer binder are as described above.

[0142] In a preferred embodiment, the coating layer contains a polymer binder in an amount of 10 to 20% by weight based on the total dry weight of the coating layer, and / or a particulate filler in an amount of 30 to 60% by weight based on the total dry weight of the coating layer, and / or an oxygen scavenger in an amount of 30 to 60% by weight based on the total dry weight of the coating layer.

[0143] Furthermore, the coating layer can contain additional additives, such as rheology modifiers, viscosity enhancers, wetting agents, waxes, antistatic agents, and / or defoaming agents. Suitable viscosity modifiers include thickeners. The viscosity modifier can be a linear polymer, a branched polymer, a comb polymer, or a mixture thereof. Preferably, the comb polymer is selected from those described in U.S. Patent Application Publication No. 2006 / 0106186 A1, which is incorporated herein by reference.

[0144] In one embodiment of the present invention, the viscosity modifier is selected from the group consisting of starch, modified starch, maltodextrin, dextran, vegetable gum, pectin, protein (e.g., collagen, egg white, gelatin, casein, albumin), kudzu root starch, corn starch, kudzu starch, katakuri starch, potato starch, sago, wheat flour, almond flour, tapioca, konjac, ayu jelly, arginine (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, tara gum, gellan gum, gutti gum, agar, gum arabic, baker's yeast glycan, arabinogalactan, tragacanth, cellulose, cellulose derivatives (e.g., carboxymethyl cellulose, sodium carboxymethyl cellulose, ethyl cellulose, methyl cellulose, hydroxypropyl methyl cellulose, hydroxymethyl cellulose, hydroxypropyl cellulose, ethyl methyl cellulose, microcrystalline cellulose, ethyl hydroxyethyl cellulose, croscarmellose), pectin, carrageenan, processed chrysanthemum, curdlan, konjac gum, casia gum, fumed silica, polyacrylic acid, saccharified gelatin gel, comb polymer, and / or their salts, and mixtures thereof. Preferably, the viscosity modifier is a compound approved for use in foodstuffs by the Food Science Committee and / or the European Food Safety Authority.

[0145] In a preferred embodiment of the present invention, the viscosity modifier is selected from the group consisting of guar gum, starch, cellulose, carboxymethyl cellulose, locust bean gum, xanthan gum, pectin, carrageenan, agar, salts thereof, derivatives thereof, and mixtures thereof.

[0146] The coating layer can contain additional additives in an amount of 0.05 to 5.0% by weight, preferably 0.1 to 2.0% by weight, more preferably 0.2 to 1.0% by weight, based on the total dry weight of the coating layer.

[0147] In a preferred embodiment of the present invention, the coating layer contains a dispersant.

[0148] In one embodiment of the present invention, the dispersant is selected from the group comprising homopolymers or copolymers of polycarboxylic acids and / or their salts and / or derivatives, for example based 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 w of such products is preferably in the range of 1000 to 15000 g / mol, and a molecular weight M w of 1500 to 6000 g / mol is particularly preferred. The molecular weight of the dispersant is selected such that the dispersant acts as a separating agent rather than as a binder. The polymer and / or copolymer may be neutralized with monovalent and / or polyvalent cations, or may have free acid groups. Suitable monovalent cations include, for example, sodium ions, lithium ions, potassium ions or ammonium ions. Suitable polyvalent cations include, for example, calcium ions, magnesium ions, strontium ions or aluminum ions. A combination of sodium ions and magnesium ions is particularly preferred.

[0149] In another embodiment of the present invention, the dispersant is selected from the group consisting of starch, carboxymethyl cellulose, glycol, polyglycol such as polyethylene glycol, ethylene oxide-propylene oxide-ethylene oxide block copolymer, sodium polyphosphate and / or polyaspartic acid and their alkali and / or alkaline earth metal salts, sodium citrate and amines, alkanolamines such as triethanolamine and triisopropanolamine, and mixtures thereof. Also, other monomer or polymer additives such as ethylene acrylic acid copolymer can 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, especially 1:5. Dispersants based on organometallic compounds can also be used. However, it is also possible to use any other dispersant.

[0150] In a preferred embodiment of the present invention, the dispersant is selected from polyacrylic acid having a molecular weight in the range of 1000 to 15000 g / mol, their salts, their derivatives, starch, carboxymethyl cellulose or mixtures thereof. More preferably, the dispersant is polyacrylic acid that is partially or completely neutralized by alkali metal ions such as lithium, sodium, potassium, cesium and mixtures thereof, preferably sodium, and has a molecular weight in the range of 1500 to 6000 g / mol.

[0151] For 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 polyacrylic acid are substituted by alkali metal ions. For 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 99 mol% of the hydrogen atoms of the carboxyl groups of polyacrylic acid are substituted by alkali metal ions.

[0152] More preferably, the dispersant is polyacrylic acid that is partially or completely neutralized by sodium ions and has a molecular weight in the range of 1500 to 6000 g / mol.

[0153] Based on the total dry weight of the coating layer, the coating layer can 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.

[0154] For the purpose of improving the uniform dispersion throughout the coating layer of the particulate filler containing minerals and for the purpose of reducing the amount of aggregates of the particulate filler containing minerals, the dispersant can be contained in the coating layer. At the same time, the specified amount can serve to maintain the possibility that the oxygen scavenger and the majority of the aqueous alkaline component, if present, reach the intracrystalline pores (e.g., the intracrystalline pores of precipitated hydrotalcite) and the intercrystalline pores of the mineral particles. In a preferred embodiment of the present invention, the dispersant is selected from polyacrylic acid having a molecular weight in the range of 1000 to 15000 g / mol, their salts, their derivatives, starch, carboxymethyl cellulose or mixtures thereof, more preferably, the dispersant is preferably polyacrylic acid that is partially or completely neutralized by alkali metal ions selected from lithium, sodium, potassium and mixtures thereof and has a molecular weight in the range of 1500 to 6000 g / mol, most preferably, the dispersant is polyacrylic acid that is partially or completely neutralized by sodium ions and has a molecular weight in the range of 1500 to 6000 g / mol, and the dispersant is contained in the coating layer of any one aspect of the present invention 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.

[0155] It is recognized that the amounts of the particulate filler, binder, at least one oxygen scavenger, any further additives and any dispersant total 100% based on the total dry weight of the coating layer. Thus, in one embodiment, the coating layer does not contain further additives, and the amounts of the particulate filler, binder, at least one oxygen scavenger and any dispersant total 100% by weight based on the total dry weight of the coating layer.

[0156] The coating layer is adapted to the uptake of oxygen and the uptake of alkaline components. Thus, the coating layer preferably has a high porosity, thereby being able to accept a sufficiently large amount of alkaline components. For the purposes of the present invention, the porosity of the coating layer is represented by the total intrusion ratio pore volume of the coating layer measured by mercury intrusion porosimetry.

[0157] Thus, the coating layer of the present invention preferably has a total intrusion ratio pore volume in the range of 0.1 to 2 cm 3 / g as measured by mercury intrusion porosimetry. In a preferred embodiment, the total intrusion ratio pore volume is in the range of 0.1 to 1.0 cm 3 / g, more preferably 0.15 to 0.5 cm 3 / g as measured by mercury intrusion porosimetry.

[0158] In a preferred embodiment, the coating layer has the following: - a total intra-particle intrusion ratio pore volume in the range of 0.05 to 1.0 cm 3 / g, preferably 0.08 to 0.5 cm 3 / g and more preferably 0.1 to 0.4 cm 3 / g as measured by mercury intrusion porosimetry, - a total inter-particle intrusion ratio pore volume in the range of 0.05 to 0.5 cm 3 / g, preferably 0.08 to 0.4 cm 3 / g and more preferably 0.1 to 0.3 cm 3 / g as measured by mercury intrusion porosimetry, and / or - Measured by mercury intrusion porosimetry, 0.05 to 0.4 cm 3 / g, preferably 0.08 to 0.3 cm 3 / g and more preferably 0.1 to 0.2 cm 3 / g of the total occlusion intrusion ratio pore volume.

[0159] The total intrusion ratio pore volume, the total interparticle intrusion ratio pore volume, and the total occlusion intrusion ratio pore volume are determined as described in C.J. Ridgway, P.A.C. Gane, "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 within the equivalent Laplace diameter range of 208 μm to 0.004 μm using a Micromeritics Autopore V mercury porosimeter. The specific pore volume is given in relation to the weight of the coating layer excluding the impermeable substrate.

[0160] The total pore volume found within the integrated intrusion data can be separated into two regions having intrusion data from 214 μm to about 10 μm showing the scroll method, and the interface between the coating and the foil contributes some initial pore volume over a large pore diameter range. Below these diameters, there is a fine interparticle pore volume in the coating. If these particles also have intraparticle pores, this region is bimodal, and the intraparticle specific pore volume is defined with the specific pore volume of mercury intruded into pores finer than the mode conversion point, i.e., finer than the inflection point of the bimodality. The sum of these three regions gives the total of the total pore volume of the coated sample.

[0161] By taking the first derivative of the integrated penetration curve, the pore size distribution based on the equivalent Laplace diameter including pore blockage is inevitably revealed. The differential curve clearly shows the occluded pore structure region, the interparticle pore region, and, if present, the intraparticle pore region. If the intraparticle pore diameter range is known, by subtracting the remaining interparticle pore volume and occluded pore volume from the total pore volume, it is possible to obtain only the desired pore volume of the internal pores as the pore volume per unit mass (specific pore volume). Naturally, the same subtraction principle applies when separating any other pore diameter region of interest.

[0162] The coating layer of the present invention has a high fluid acceptance capacity. In a preferred embodiment, the coating layer has a fluid acceptance capacity in the range of 1 to 150% by weight, more preferably 10 to 125% by weight, and most preferably 15 to 100% by weight. For example, the coating layer has a fluid acceptance capacity in the range of 1 to 50% by weight, more preferably 10 to 45% by weight, and most preferably 15 to 35% by weight. Therefore, the coating layer can carry a large amount of aqueous alkali components without peeling of the coating layer and without leakage of the aqueous alkali components.

[0163] The "fluid acceptance capacity" of the coating layer should be understood as the amount of fluid, such as water, that the coating layer can absorb without leakage of the fluid or peeling of the coating layer at room temperature. The fluid acceptance capacity is determined visually. The fluid acceptance capacity is given in units of % by weight and means the weight of the fluid per weight of the coating layer. Preferably, the fluid is water or a 1M aqueous solution of K2CO3.

[0164] A granular filler containing a mineral (e.g., precipitated hydromagnesite) is present in the coating layer, thereby providing high porosity of the coating layer. When precipitated hydromagnesite is present in particular in the intra-particle pores, inter-particle pores and coarse aggregate pores of the granular filler, the intra-particle pores, inter-particle pores and coarse aggregate pores are partially filled with an oxygen scavenger and are partially retained in the coating layer, and thus it is considered that high uptake of the aqueous alkaline component is enabled.

[0165] A polymer binder is added so that a coating layer can be obtained which is evenly distributed on the base material layer and can adhere to the base material layer. The amount of the polymer binder added is selected to be sufficiently high to enable sufficient aggregation and adhesion of the layer, but sufficiently low so as not to block or clog the pores of the mineral (e.g., precipitated hydromagnesite). In a preferred embodiment, the coating layer contains the polymer binder in an amount of 10% to 20% by weight, more preferably 12% to 18% by weight, based on the total dry weight of the coating layer.

[0166] Kit for improving the shelf life of food According to a first aspect of the present invention, there is provided a kit for improving the shelf life of a food product containing a sheet-like element component and an alkaline component.

[0167] Sheet-like element component The sheet-like element includes a coating layer and a base material layer. The base material layer and the coating layer have been described above.

[0168] The coating layer is deposited on the substrate layer, where the substrate layer is as described above. The present invention is not limited to any particular substrate layer. A person skilled in the art adjusts the composition of the coating layer so as to enable effective adhesion of the coating layer to the selected substrate layer. Depending on the substrate layer used, the sheet-like element may be flexible, i.e., it can be bent without peeling of the coating layer, or rigid. The substrate layer enables a uniformly distributed coating layer to be obtained. Thus, optimal adhesion of the coating layer to the substrate layer can be achieved regardless of the material of the food package. Further, the substrate layer enables "additional functionality" of the sheet-like element. Preferably, the coating layer is 1 to 200 g / m 2 , preferably 2 to 150 g / m 2 , more preferably 10 to 120 g / m 2 , most preferably 25 to 100 g / m 2 and is present on the substrate layer in an amount of. The coating layer can be applied to the substrate layer by a process described below, preferably by a roller coating step.

[0169] In another embodiment of the present invention, the sheet-like element further comprises one or more adhesive layers located on the substrate layer on the opposite side of the coating layer and / or between individual substrate layers, where the adhesive layer is preferably selected from the group consisting of adhesives, sealants, rubber coatings, pressure-sensitive layers, and mixtures of the above. When an adhesive layer is present, the adhesive layer is used to temporarily or permanently fix the sheet-like element to the inner surface of the food package or to temporarily fix the sheet-like element to a sheet-like element supply device as described below. However, even if no adhesive layer is present, the sheet-like element can simply be roughly placed inside the food package. When the adhesive layer is present between individual substrate layers, the adhesive layer enables improved adhesion of the individual substrate layers and thus improves the lifespan and durability of the sheet-like element.

[0170] Suitable materials for the adhesive layer are known to those skilled in the art and include those listed in Title 21, Part 175.105 of the Code of Federal Regulations (CFR). Specific examples include polyethyleneimine, polyurethane, polyacrylate, and starch. Suitable materials for the pressure-sensitive layer include those listed in CFR Title 21, Part 175.125.

[0171] In another embodiment of the present invention, the sheet-like element further includes one or more primer layers located between the substrate layer and the coating layer. The primer layer can be selected from any suitable material known to those skilled in the art, and preferably is selected from the group including polyurethane, ethylene vinyl acetate, polyvinyl chloride, nitrocellulose, acrylate, ethylene acrylate, polyacrylonitrile (acrylic), and mixtures thereof. More preferably, the primer layer is formed from an aqueous dispersant containing acrylate, ethylene acrylate, polyacrylonitrile, polyurethane, and / or nitrocellulose. Optionally, the primer layer further contains polysilicic acid. When the primer layer is present between the substrate layer and the coating layer, the primer layer enables improvement of the adhesion between the individual substrate layer and / or between the substrate layer and the coating layer, and thus improves the life and durability of the sheet-like element.

[0172] In a preferred embodiment of the present invention, the sheet-like element further includes one or more oxygen-permeable coating layers for permanently coating the coating layer. The term "oxygen-permeable" coating layer in the context of the present invention means a coating layer that allows the passage of oxygen, for example, due to the presence of micropores.

[0173] The oxygen-permeable coating layer allows for substantially unobstructed permeation of oxygen from the atmosphere for food products into the coating layer, while preventing the coating layer and the food product from coming into direct contact with each other. Therefore, it is preferable to select the breathable coating layer from the group consisting of a breathable film layer, a fiber material layer, and a non-woven fabric layer. The breathable film layer may be made of a material such as polyethylene, polypropylene, or polyethylene terephthalate. Suitable breathable film layers include those disclosed in WO 2016 / 023937 A1. Suitable fiber material layers and non-woven fabric layers for use as the breathable coating layer include those as described above in relation to the substrate layer.

[0174] In a preferred embodiment, the oxygen-permeable coating layer prevents the passage of moisture or water vapor, and thereby prevents the water added in the form of an aqueous alkaline component from evaporating from the coating layer. Thereby, the oxygen scavenging activity of the activated sheet-like element can be further improved in a low humidity environment (for example, less than 50% rH). An exemplary coating layer that is oxygen-permeable but moisture-impermeable is an LDPE film. Such a layer may or may not be removed from the sheet-like element component for the application of the aqueous alkaline component. In a preferred embodiment, the sheet-like element component can be activated by the application of the aqueous alkaline component while the coating layer is still present. In this embodiment, the coating layer can remain on the activated sheet-like element during use. Alternatively, the oxygen-permeable coating layer may be added to the activated sheet-like element, i.e., after the application of the aqueous alkaline component.

[0175] In another embodiment of the present invention, the sheet-like element further comprises one or more protective layers for temporarily sealing the coating layer and / or the adhesive layer, where the protective layer is preferably selected from polyethylene, polypropylene and / or coated paper. The protective layer shields the coating layer from environmental influences such as contamination by dust or grease until the sheet-like element components are used, i.e., until they are activated by the alkaline component and installed in the food package. If the sheet-like element components already carry the alkaline component, the protective layer is an oxygen-impermeable layer that prevents premature reaction with oxygen prior to the intended use. Therefore, it is necessary that the protective layer can be removed from the coating layer without damaging the coating layer. Preferably, the protective layer is made of any polymer material, such as polyethylene, polypropylene or polystyrene, or coated paper. If a breathable coating layer is present within the sheet-like element, the protective layer is installed on the breathable coating layer.

[0176] The sheet-like element can have a size that is adjusted according to the specific needs of the field of use, for example, according to the size of the food package and / or the type and amount of food products within the package. The sheet-like element can be in the form of, for example, a square or round patch or piece. The coated area or size of the sheet-like element can range from 3 to 200 cm 2 , preferably from 4 to 150 cm 2 , more preferably from 5 to 100 cm 2 . The sheet-like element according to one embodiment can have a coated area or size of 3 to 50 or 5 to 40 cm 2 , for example 3 to 30 or 5 to 25 cm 2 .

[0177] In one embodiment of the present invention, two or more of the above-described sheet-like elements are combined to form a laminated sheet-like element. It is recognized that two or more sheet-like elements may be the same sheet-like element or different sheet-like elements. Two or more sheet-like elements are combined so that the coating layers of each individual sheet-like element are not blocked or are only slightly blocked. The term "only slightly blocked" means that at most 25%, preferably at most 15%, more preferably at most 10% of the coated area of the sheet-like element is blocked or sealed. Accordingly, two or more sheet-like elements are combined using an intermittent adhesive layer, for example, by using dot adhesives preferably disposed between two or more sheet-like elements, whereby at most 25%, preferably at most 15%, more preferably at most 10% of the area of the coating layer of the sheet-like element is blocked or sealed. Accordingly, the size of the laminated sheet-like element may be smaller than the entire active oxygen scavenging area.

[0178] In another embodiment of the present invention, one or more of the sheet-like elements as described above are combined with another functional coating layer. One or more of the sheet-like elements are combined with a functional coating layer, whereby the coating layers of each individual sheet-like element and each functional coating layer are not blocked or are only slightly blocked, for example, by using the intermittent adhesive layer defined above. The functional coating layer may be selected from the group including a moisture control layer, a corrosion inhibition layer, a metal chelation layer, an antibacterial activity layer, a temperature monitoring layer, a radio frequency identification (RFID) layer, an anti-counterfeiting printing layer, and a metallized film layer for packages that can be used in a microwave oven, for example.

[0179] The sheet-like element components can be manufactured using the methods described below.

[0180] Alkali component The kit of the present invention further comprises an alkaline component. The alkaline component comprises a base having a pK b value of 6 or lower.

[0181] pK b indicates an index of base strength and corresponds to the addition of a proton to the anion of the base and thus to the formation of the corresponding acid of the base. pK b values can be calculated as follows: pK b = 14 - pK a . Both of these values can be collected from standard textbooks and / or tables.

[0182] It should be understood that the alkaline component of the kit can consist of a base or the alkaline component of the kit can include additional components such as, for example, a solvent, preferably water. In the present specification, an alkaline component containing a base and water is referred to as an "aqueous alkaline component". In a preferred embodiment of the present invention, the alkaline component is an aqueous alkaline component containing a base and water.

[0183] The base activates at least one oxygen scavenger by at least partially deprotonating at least two phenolic hydroxyl groups. Thus, the base must be strong enough to at least partially deprotonate such phenolic hydroxyl groups. Without wishing to be bound by theory, the resulting strongly electron-donating phenolate group increases the electron density in the aryl ring of at least one oxygen scavenger and thus enables reaction with oxygen. At least one activated oxygen scavenger can lead to the formation of a plurality of by-products such as dimers, ring-opened compounds and quinones as well as hydrogen peroxide through various reactions with oxygen. These reactions are mediated or enabled by the presence of water. Therefore, it is necessary to dissolve or suspend the base in water before activation.

[0184] Therefore, when the alkaline component of the kit of the present invention does not contain water, the alkaline component is dissolved or suspended in water immediately before use to form an aqueous alkaline component. Dissolving or suspending the alkaline component in water only immediately before use is advantageous because it can minimize storage and shipping costs and facilitate handling of the alkaline component before use.

[0185] In a preferred embodiment, the base has a pK b value of 5 or lower, more preferably a pK b value of 4 or lower. Most preferably, the base has a pK b in the range of 4 to 0.

[0186] The base can be selected from the group consisting of hydroxide bases, carbonate bases, ammonia bases, and mixtures thereof, preferably selected from the group consisting of lithium hydroxide, sodium hydroxide, potassium hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, cesium carbonate, and mixtures thereof, and most preferably selected from the group consisting of sodium hydroxide, potassium carbonate, and sodium carbonate.

[0187] Regarding the present invention, hydroxide bases (pK b = 0) are considered to be basic metal hydroxides, particularly alkali metal hydroxides and alkaline earth metal hydroxides. Carbonate bases (pK b = 3.6) are considered to be metal carbonates, particularly alkali metal carbonates and alkaline earth metal carbonates. Ammonia bases are bases containing a nitrogen atom and are preferably understood to be ammonium hydroxide (or ammonia, pK b = 4.75), primary amines, secondary amines, or tertiary amines.

[0188] 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 prior to use to form an aqueous alkaline component.

[0189] 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.

[0190] In another preferred embodiment, the aqueous alkaline component contains a base in an amount of 1 wt% to 75 wt%, more preferably 5 wt% to 60 wt%, and most preferably 10 to 35 wt% based on the total weight of the aqueous alkaline component.

[0191] In a preferred embodiment of the present invention, a kit for improving the shelf life of food comprises the following: (a) A sheet-like element component having the following: (a1) A coating layer containing the following: (i) A granular filler in an amount of 25 to 70 wt% based on the total dry weight of the coating layer, where the granular filler contains a mineral that exceeds 50 wt% of the total amount of the filler, preferably a mineral that is an alkaline earth metal mineral, a silicate, or a mixture thereof, the mineral is not surface-reacted calcium carbonate, the surface-reacted calcium carbonate is a reaction product of natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + ion donors, where the carbon dioxide is formed in situ by treatment with the H3O + ion donors and / or supplied from an external source; (ii) A polymer binder in an amount of 5 to 25 wt% based on the total dry weight of the coating layer; and (iii) At least one oxygen scavenger in an amount of 25 to 70 wt% based on the total dry weight of the coating layer, where The at least one oxygen scavenger is selected from the group consisting of phenolic acids having at least two phenolic hydroxyl groups arranged ortho or para to each other, cinnamic acids having at least two phenolic hydroxyl groups arranged ortho or para to each other, derivatives thereof, and mixtures thereof. The derivatives of the acids are selected from the group consisting of alkyl esters, aryl esters and essentially fully deprotonated acids of the respective acids; and (a2) A substrate layer, and (b) An alkaline component having a pK b value of 6 or lower and containing a base selected from the group consisting of hydroxide bases, carbonate bases, ammonia bases and mixtures thereof.

[0192] In a preferred embodiment of the present invention, a kit for improving the shelf life of food comprises: (a) A sheet-like element component having: (a1) A coating layer containing: (i) A granular filler in an amount of 25 to 70% by weight based on the total dry weight of the coating layer, wherein the granular filler contains a mineral selected from the group consisting of precipitated hydromagnesite, ground natural calcium carbonate, precipitated calcium carbonate, and mixtures thereof in an amount exceeding 50% by weight based on the total amount of the granular filler, the mineral is not surface-reacted calcium carbonate, the surface-reacted calcium carbonate is a reaction product of natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + ion donors, wherein the carbon dioxide is formed in situ by treatment with the H3O + ion donors and / or supplied from an external source; (ii) A polymer 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 selected from the group consisting of a phenolic acid derivative having at least two phenolic hydroxyl groups arranged ortho or para to each other, a cinnamic acid derivative having at least two phenolic hydroxyl groups arranged ortho or para to each other, and mixtures thereof; the acid derivative is selected from the group consisting of the alkyl ester, aryl ester of each acid, and the essentially fully deprotonated acid; and (a2) a substrate layer, and (b) an alkaline component having a pK b value of 6 or lower and containing a base selected from the group consisting of hydroxide bases, carbonate bases, ammonia bases, and mixtures thereof.

[0193] In another preferred embodiment of the present invention, a kit for improving the shelf life of food comprises: (a) a sheet-like element component having: (a1) a coating layer containing: (i) a granular filler in an amount of 25 to 70% by weight based on the total dry weight of the coating layer, wherein the granular filler contains minerals in an amount of at least 70% by weight based on the total amount of the granular filler, preferably minerals that are alkaline earth metal minerals, silicates, or mixtures thereof, more preferably minerals that are precipitated hydromagnesite, ground natural calcium carbonate, precipitated calcium carbonate, or mixtures thereof, the minerals are not surface-reacted calcium carbonate, the surface-reacted calcium carbonate is a reaction product of natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + ion donors, wherein the carbon dioxide is formed in situ by treatment with the H3O + ion donors and / or supplied from an external source; (ii) a polymer binder in an amount of 5 to 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 (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 selected from the group consisting of gallic acid, digallic acid, protocatechuic acid, caffeic acid, 5-hydroxyferulic acid, gentisic acid, orsellinic acid, kebulinic acid, phloroglucinol carboxylic acid, chicoric acid, their derivatives, and mixtures thereof, and more preferably, the at least one oxygen scavenger is gallic acid or its derivative, the derivative of the acid is selected from the group consisting of alkyl esters, aryl esters of the respective acids, and essentially fully deprotonated acids; and (a2) a substrate layer, and (b) an alkaline component containing 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.

[0194] In yet another preferred embodiment of the present invention, a kit for improving the shelf life of food comprises: (a) a sheet-like element component having: (a1) a coating layer containing: (i) a particulate filler in an amount of 25 to 70% by weight based on the total dry weight of the coating layer, wherein the particulate filler contains a mineral that is at least 90% by weight of the total amount of the particulate filler, and is sedimentary hydromagnesite, ground natural calcium carbonate, precipitated calcium carbonate, or a mixture thereof, 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+ A reaction product with an ion donor, wherein the carbon dioxide is the H3O + Formed in situ by treatment with an ion donor and / or supplied from an external source; (ii) A polymer binder in an amount of 5 to 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 (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 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, kebrinic acid derivatives, phloroglucinol carboxylic acid derivatives, chicoric acid derivatives, and mixtures thereof, and more preferably, the at least one oxygen scavenger is a gallic acid derivative, The acid derivatives are essentially completely deprotonated acids of the respective acids and contain cations selected from the group consisting of sodium, potassium, calcium, magnesium, and mixtures thereof, most preferably calcium cations; and (a2) A substrate layer, and (b) An alkaline component containing 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.

[0195] Activated sheet-like element A second aspect of the present invention relates to an activated sheet-like element formed from a kit of the present invention by adding an alkaline component to a coating layer of a sheet-like element component, the activated sheet-like element containing a reaction product of at least one oxygen scavenger and a base.

[0196] It should be understood that the kit, the sheet-like element component, the alkali component, the base and at least one oxygen scavenger are detailed above.

[0197] The activated sheet-like element contains a reaction product of at least one oxygen scavenger and a base. The phenolic hydroxyl group of at least one oxygen scavenger is at least partially deprotonated, whereby the phenolic hydrogen atom is replaced by the cation 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%, still more preferably 25 mol%, and most preferably at least 50 mol% of all phenolic hydrogen atoms are replaced by the cation of the base. As an example, when at least one oxygen scavenger contains three phenolic hydroxyl groups, three phenolic hydrogen atoms are present. The cation corresponds to the cation of the base and is thus preferably selected from alkali metal ions, alkaline earth metal ions and ammonium ions (i.e., NH4 + , primary ammonium ions, secondary ammonium ions or tertiary ammonium ions), more preferably selected from lithium, sodium, potassium and cesium, and most preferably selected from potassium and sodium.

[0198] In a preferred embodiment, the alkali component is added in an amount such that the base is added in an amount of at least 0.01 molar equivalent, preferably at least 0.02 molar equivalent, more preferably at least 0.05 molar equivalent, still more preferably at least 0.1 molar equivalent, based on the molar amount of the oxygen scavenger.

[0199] The inventors have recognized that a relatively small amount, i.e., a sub-stoichiometric or catalytic amount, of base is sufficient to activate at least one oxygen scavenger. However, it is also possible to use a larger amount of base.

[0200] In another preferred embodiment, the alkaline component is added in an amount of 10 to 70% by weight, preferably 20 to 65% by weight, more preferably 35 to 60% by weight, based on the total weight of the coating layer. The term "total weight of the coating layer" means the coating layer including the alkaline component.

[0201] Additionally, or alternatively, the alkaline component is added in an amount of 25 to 200% by weight, preferably 50 to 150% by weight, based on the total weight of the dry coating layer.

[0202] The alkaline component is preferably an aqueous alkaline component as defined above. Thus, the alkaline component used for the formation of the activated sheet-like element contains a large amount of water, and this water helps to maintain the activity of the activated sheet-like element during storage. The amount of the alkaline component is large enough for the oxygen scavenger to be activated, but is selected so that delamination of the coating layer does not occur.

[0203] The inventors have recognized that the coating layer 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 a low relative humidity.

[0204] In other words, the activated sheet-like element of the present invention preferably includes the following: (a1) A coating layer including the following: (i) A granular filler in an amount of 25 to 70% by weight based on the total dry weight of the coating layer, where the granular filler contains a mineral in an amount exceeding 50% by weight based on the total amount of the granular filler, preferably a mineral that is an alkaline earth metal mineral, a silicate, or a mixture thereof, and most preferably a mineral that is precipitated hydro-magnesite, ground natural calcium carbonate, precipitated calcium carbonate, or a mixture thereof, the mineral is not surface-reacted calcium carbonate, The surface-reacted calcium carbonate is a reaction product of natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + ion donors, wherein the carbon dioxide is formed in situ by treatment with the H3O + ion donor and / or supplied from an external source; (ii) a polymer 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 phenyl ring having at least two phenolic hydroxyl groups and at least one R group, two of the at least two phenolic hydroxyl groups are arranged ortho or para to each other on the at least one phenyl ring, and 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 a -Y-R 1 group, preferably R is a -Y-R 1 group, wherein -Y is selected from the group consisting of a direct bond, a straight-chain 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 aryloxycarbonyl group, or an essentially fully deprotonated carboxyl group; and (a2) a substrate layer.

[0205] Here, the coating layer, granular filler, mineral (e.g., precipitated hydro-magnesite), polymer binder, and substrate layer are as described above. At least one activated oxygen scavenger is a compound derived from at least one oxygen scavenger as described above by reacting at least one oxygen scavenger with a base. The activated sheet-like element can include the additional layers described above within the context of the sheet-like element components.

[0206] In a preferred embodiment, the activated sheet-like element has an oxygen scavenging rate (OSR) in the range of 5 to 200 mL O2 / (d g os ), preferably 10 to 150 mL O2 / (d g os ), more preferably 20 to 100 mL O2 / (d g os ). The OSR is expressed in mL of oxygen adsorbed per day per gram of oxygen scavenger. The OSR is determined by placing the activated sheet-like element in a sealed tray having a headspace containing a mixture of N2 and O2 (volume ratio 98:2) of 250 cm 3 and measuring the oxygen content in the headspace of the tray until the oxygen content is less than 0.4% by volume. The amount of oxygen captured is divided by the time required to reduce the oxygen content to less than 0.4% by volume and the amount of oxygen scavenger in the activated sheet-like element.

[0207] In another preferred embodiment, the activated sheet-like element has an oxygen scavenging capacity (OSC) in the range of 75 to 400 mL O2 / g os . The OSC is expressed in mL of oxygen adsorbed per gram of oxygen scavenger. The OSC is determined in a mixture of N2 and O2 (approximate volume ratio 80:20) of 250 cm 3An activated sheet-like element is placed in a sealed tray having a space formed at the top containing [the relevant substance], and the oxygen content in the upper space of the tray is measured until the oxygen content becomes constant, for example, until the oxygen content does not change by more than 0.1% by volume over 6 hours. The amount of oxygen captured is removed by the amount of oxygen scavenger in the activated sheet-like element.

[0208] In a preferred embodiment of the present invention, the activated sheet-like element comprises the following: (a) A sheet-like element component having the following: (a1) A coating layer containing the following: (i) A granular filler in an amount of 25 to 70% by weight based on the total dry weight of the coating layer, where the granular filler contains a mineral in an amount of more than 50% by weight based on the total amount of the granular filler, preferably a mineral that is an alkaline earth metal mineral, a silicate, or a mixture thereof, and most preferably a mineral that is precipitated hydro-magnesite, ground natural calcium carbonate, precipitated calcium carbonate, or a mixture thereof, the mineral is not surface-reacted calcium carbonate, the surface-reacted calcium carbonate is a reaction product of natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + ion donors, where the carbon dioxide is formed in situ and / or supplied from an external source by treatment with the H3O + ion donors; (ii) A polymer 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, where The at least one oxygen scavenger is selected from the group consisting of a phenolic acid derivative having at least two phenolic hydroxyl groups arranged ortho or para to each other, a cinnamic acid derivative having at least two phenolic hydroxyl groups arranged ortho or para to each other, and mixtures thereof. The acid derivative is selected from the group consisting of alkyl esters, aryl esters and substantially fully deprotonated acids of the respective acids; and (a2) a substrate layer, and (b) an alkaline component having a pK b value of 6 or lower and containing a base selected from the group consisting of hydroxide bases, carbonate bases, ammonia bases and mixtures thereof.

[0209] In another preferred embodiment of the present invention, the activated sheet-like element comprises: (a) a sheet-like element component having: (a1) a coating layer containing: (i) a particulate filler in an amount of 25 to 70% by weight based on the total dry weight of the coating layer, where the particulate filler contains a mineral that is at least 70% by weight, based on the total amount of the particulate filler, of precipitated hydrotalcite, ground natural calcium carbonate, precipitated calcium carbonate, or a mixture thereof, the mineral is not surface-reacted calcium carbonate, the surface-reacted calcium carbonate is a reaction product of natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + ion donors, the carbon dioxide being formed in situ by treatment with the H3O + ion donor and / or supplied from an external source; (ii) a polymer binder in an amount of 5 to 25% by weight based on the total dry weight of the coating layer, where 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 (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 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, keblinic acid derivatives, phloroglucinol carboxylic acid derivatives, chichoric acid derivatives, and mixtures thereof, and more preferably, the at least one oxygen scavenger is a gallic acid derivative, the derivatives of the acid are each selected from the group consisting of alkyl esters, aryl esters of the respective acid, and essentially fully deprotonated acids, the phenolic hydroxyl groups of the derivatives of the acid are at least partially deprotonated; and (a2) a substrate layer, and (b) an alkaline component containing 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.

[0210] In yet another preferred embodiment of the present invention, the activated sheet-like element comprises: (a) a sheet-like element component having: (a1) a coating layer containing: (i) a granular filler in an amount of 25 to 70% by weight, based on the total dry weight of the coating layer, wherein the granular filler contains a mineral that is at least 90% by weight, based on the total amount of the granular filler, of sedimentary hydromagnesite, ground natural calcium carbonate, precipitated calcium carbonate, or a mixture thereof, the mineral is not surface-reacted calcium carbonate, The surface-reacted calcium carbonate is a reaction product of natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + ion donors, wherein the carbon dioxide is formed in situ by treatment with the H3O + ion donors and / or supplied from an external source; (ii) a polymer binder in an amount of 5 to 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 (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 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, keblinic acid derivatives, phloroglucinol carboxylic acid derivatives, chicoric acid derivatives, and mixtures thereof, and more preferably, the at least one oxygen scavenger is a gallic acid derivative, the acid derivatives are essentially completely deprotonated acids of the respective acids and contain cations selected from the group consisting of sodium, potassium, calcium, magnesium, and mixtures thereof, most preferably calcium cations, the phenolic hydroxyl groups of the acid derivatives are at least partially deprotonated; and (a2) a substrate layer, and (b) an alkaline component containing 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.

[0211] The activated sheet-like element can be manufactured by the method described below.

[0212] Method of the present invention A third aspect of the present invention relates to a method for manufacturing a kit for improving the shelf life of food. This method includes the following steps: (a) Providing a granular filler containing a mineral, preferably a granular filler containing a mineral that is an alkaline earth metal mineral, a silicate, or a mixture thereof, in an amount exceeding 50% by weight based on the total amount of the granular filler, wherein the mineral is not surface-reacted calcium carbonate, the surface-reacted calcium carbonate is a reaction product of natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + ion donors, wherein the carbon dioxide is formed in situ by treatment with the H3O + ion donors and / or supplied from an external source; (b) Providing at least one oxygen scavenger that is a compound having at least one phenyl ring having at least two phenolic hydroxyl groups and at least one R group, wherein two of the at least two phenolic hydroxyl groups are located ortho or para to each other on the at least one phenyl ring, and 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 a -Y-R 1 group, preferably R is a -Y-R 1 group, wherein -Y is selected from the group consisting of a direct bond, a straight-chain 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 aryloxycarbonyl group, a carboxyl group, or an essentially fully deprotonated carboxyl group; (c) Providing a polymer binder; (d) Providing a substrate layer including one or more individual substrate layers, or a food package including the substrate layer; (e) Mixing the oxygen scavenger of step (b), the particulate filler of step (a) and the polymer binder of step (c) in the order described herein 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 component; (h) Providing an alkaline component comprising a base having a pK b value of 6 or lower; 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% by weight, more preferably 5% to 60% by weight, and most preferably 10% to 35% by weight, based on the total weight of the aqueous alkaline component.

[0213] In a fourth aspect of the present invention, a method for manufacturing a sheet-like element component is provided. This method includes the following steps: (a) Providing a particulate filler containing a mineral, preferably a particulate filler containing a mineral that is an alkaline earth metal mineral, a silicate, or a mixture thereof, in an amount exceeding 50% by weight based on the total amount of the particulate filler, wherein the mineral is not surface-reacted calcium carbonate, the surface-reacted calcium carbonate is a reaction product of natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + ion donors, wherein the carbon dioxide is formed in situ by treatment with the H3O + ion donors and / or supplied from an external source; (b) Providing at least one oxygen scavenger which is a compound having at least one phenyl ring with at least two phenolic hydroxyl groups and at least one R group, wherein two of the at least two phenolic hydroxyl groups are located ortho or para to each other on the at least one phenyl ring, and R is -Y-R 1 group, where -Y is selected from the group consisting of a direct bond, a straight 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 essentially fully deprotonated carboxyl group; (c) Providing a polymer binder; (d) Providing a substrate layer comprising one or more individual substrate layers, or a food package comprising the substrate layer; (e) Mixing the oxygen scavenger of step (b), the particulate filler of step (a), and the polymer binder of step (c) in the order described herein 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 component; 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 phenyl ring with at least two phenolic hydroxyl groups and at least one R group, where two of the at least two phenolic hydroxyl groups are located ortho or para to each other on the at least one phenyl ring, and R is -Y-R 1 group, where - Y is selected from the group consisting of 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 a carboxyl group, (b2) providing a basic compound, and (b3) reacting the carboxyl group of the oxygen scavenger precursor in step (b1) with the basic compound in step (b2) to obtain the oxygen scavenger.

[0214] Steps (a) to (g) in both methods of the present invention will be described below.

[0215] In step (a) of the method of the present invention, it is recognized that the above-described granular filler is provided. Further, 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 material layer provided in step (d) of the method of the present invention are as described above. The granular filler in step (a), at least one oxygen scavenger in step (b) and / or the polymer binder in step (c) can be provided independently of each other in a pure form, or alternatively in the form of a solution or suspension, where at least one of the granular filler in step (a), at least one oxygen scavenger in step (b), and / or the polymer binder in step (c) is provided in the form of a solution or suspension, or dissolved or suspended in a solvent prior to the mixing step (e).

[0216] In a preferred embodiment of the present invention, the polymer binder in 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 in 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 to 12, for example 8 to 10. The pH value can be adjusted using any acid or base known to those skilled in the art. When the pH value of the solution is initially less than 7, it is preferred to adjust the pH value using an aqueous solution of a base such as sodium hydroxide solution. By adjusting the pH value to the specified range, the swelling characteristics of the polymer binder can be improved.

[0217] In the mixing step (e), at least one oxygen scavenger of step (b), the particulate filler of step (a) and the polymer binder of step (c) are mixed in this order to obtain a coating composition.

[0218] Preferably, the coating composition thus obtained contains a particulate filler in an amount of 25 to 70% by weight, preferably 30 to 60% by weight, more preferably 40 to 60% by weight based on the total dry weight of the coating composition, at least one oxygen scavenger in an amount of 25 to 70% by weight, preferably 30 to 60% by weight, more preferably 40 to 60% by weight based on the total dry weight of the coating composition, and a binder in an amount of 5 to 25% by weight, preferably 10 to 20% by weight, more preferably 12 to 18% by weight based on the total dry weight of the coating composition.

[0219] When the coating composition obtained in step (e) is temporarily stored until its further processing or use, it can be stored under an inert gas atmosphere, for example under nitrogen.

[0220] The amounts of the particulate filler, binder, at least one oxygen scavenger, any additional additives, and any dispersant, based on the total dry weight of the coating layer, total 100% by weight. Thus, in one embodiment, the coating layer does not contain additional additives, and the amounts of the particulate filler, binder, at least one oxygen scavenger, and any dispersant total 100% by weight based on the total dry weight of the coating layer.

[0221] Preferably, mixing step (e) is carried out in the presence of a solvent. Accordingly, the coating composition is obtained in the form of a slurry. The solvent may be any solvent that enables the dispersion of the particulate filler containing minerals, at least one oxygen scavenger, and the polymer binder within the coating composition, such as water, acetone, ethanol, methanol, or butanone. In a particularly preferred embodiment, the solvent is water.

[0222] The solids content of the coating composition is preferably in the range of 10 to 80% by weight, more preferably 20 to 70% by weight, even more preferably 30 to 60% by weight, and most preferably 40 to 55% by weight, based on the total weight of the coating composition.

[0223] During mixing step (e), additional additives such as a rheology modifier, viscosity enhancer, wetting agent, wax, antistatic agent, dispersant, and / or defoaming agent can optionally be added. Suitable viscosity modifiers include thickeners such as the thickeners described above. According to one embodiment, the additional additives can be added in an amount of 0.05 to 5.0% by weight, preferably 0.1 to 2.0% by weight, and more preferably 0.2 to 1.0% by weight, based on the total dry weight of the coating composition.

[0224] In a preferred embodiment of the present invention, the dispersant as described above is added in an amount of 0.1 to 10% by weight, preferably 0.5 to 7% by weight, more preferably 1 to 4% by weight, based on the total dry weight of the coating composition during the mixing step (e). In this embodiment, it is necessary to add the dispersant to at least one oxygen scavenger in step (b) before adding the particulate filler in step (a).

[0225] Generally, the polymer binder, particulate filler and at least one oxygen scavenger can be brought into contact by any conventional means known to those skilled in the art. For example, the compounds can be mixed in the absence or presence of a solvent. Suitable mixing devices are known to those skilled in the art and can include mixers or blenders, such as tumble mixers, vertical or horizontal ploughshare mixers, such as the Ploughshare® mixer available from Gebrueder Loedige Maschinenbau GmbH or laboratory mixers, such as the MP mixer available from Somakon Verfahrenstechnik UG. Those skilled in the art can adapt the mixing conditions (e.g., the configuration of the mixing speed) according to their needs and the available equipment.

[0226] The inventors have found that this mixing order ensures that the finally obtained coating layer has high porosity. The defined order also allows for processing or mixing as a high-solid slurry, which is advantageous compared to low-solid processing that uses large amounts of water or solvent.

[0227] In application step (f), the coating composition of step (e) is applied (coated) onto the substrate layer of step (d) to form a 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 by a coating step, more preferably by roller coating, dip coating, rod coating, grooved rod coating, curtain coating, rigid blade coating, applicator roll coating, fountain coating, jet coating, short dwell coating, slot die coating, curved blade coating, inclined blade coating, air knife coating, bar coating, gravure coating, conventional or metered size press coating, spray coating technology, screen printing and / or wet stack coating, most preferably by roller coating.

[0228] Preferably, the coating composition is applied in an amount sufficient to produce a coating weight of the final coating layer of 1 to 200 g / m 2 , preferably 2 to 150 g / m 2 , more preferably 10 to 120 g / m 2 , most preferably 25 to 100 g / m 2 onto the substrate layer.

[0229] If the sheet-like element further includes a primer layer, the primer layer is applied onto the substrate layer of step (d) prior to the application step (f) in a priming step (f1). The primer layer can be applied using any suitable application process known to those skilled in the art, either in an in-line process, i.e., using the same manufacturing method or the same apparatus as in the case of the application of the coating composition in the application step (f), or in an off-line process, i.e., using separate equipment for the priming step (f1) and the application step (f).

[0230] The drying step (g) can be carried out by any method known to those skilled in the art. Preferably, the drying step (g) is carried out at a temperature in the range of 50 to 150 °C under ambient pressure or reduced pressure, preferably by hot air drying, IR radiation drying or UV radiation drying. The sheet-like element thus obtained preferably has a total intrusion ratio pore volume in the range of 0.25 to 2 cm 3 / g as measured by mercury intrusion porosimetry and includes a coating layer. In a preferred embodiment, the total intrusion ratio pore volume is in the range of 0.1 to 1.5 cm 3 / g, more preferably in the range of 0.1 to 1.0 cm 3 / g as measured by mercury intrusion porosimetry.

[0231] In a preferred embodiment, the coating layer has the following: - A total intraspecific intrusion ratio pore volume in the range of 0.05 to 1.0 cm 3 / g, preferably 0.08 to 0.5 cm 3 / g and more preferably 0.1 to 0.4 cm 3 / g as measured by mercury intrusion porosimetry, - A total interparticle intrusion ratio pore volume in the range of 0.05 to 0.5 cm 3 / g, preferably 0.08 to 0.4 cm 3 / g and more preferably 0.1 to 0.3 cm 3 / g as measured by mercury intrusion porosimetry, and / or - A total occlusion intrusion ratio pore volume in the range of 0.05 to 0.4 cm 3 / g, preferably 0.08 to 0.3 cm 3 / g and more preferably 0.1 to 0.2 cm 3 / g as measured by mercury intrusion porosimetry.

[0232] The manufacturing method of the kit of the present invention for improving the shelf life of food further includes a step (h) of providing an alkaline component containing a base having a pK b value of 6 or lower. In this step, the alkaline component as described above is provided.

[0233] Preferably, the method for producing the kit according to the present invention for improving the shelf life of food further includes step (i) of mixing the alkaline component in step (h) with water to obtain an aqueous alkaline component containing a base and water, where 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 contains the base in an amount of 1% to 75% by weight, more preferably 5% to 60% by weight, and most preferably 10% to 35% by weight based on the total weight of the aqueous alkaline component.

[0234] It is recognized that the aqueous alkaline component thus obtained is as described above. Step (i) can be carried out by any mixing means known to those skilled in the art, for example, by the means described above for method step (e).

[0235] Method step (b) of the method of the present invention can include the following substeps: (b1) providing at least one oxygen scavenger precursor, which is a compound having at least one phenyl ring with at least two phenolic hydroxyl groups and at least one R group, wherein two of the at least two phenolic hydroxyl groups are located ortho or para to each other on the at least one phenyl ring, and R is -Y-R 1 group, where - Y is selected from the group consisting of 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 a carboxyl group, (b2) providing a basic compound, and (b3) reacting the carboxyl group of the oxygen scavenger precursor in step (b1) with the basic compound in step (b2) to obtain the oxygen scavenger.

[0236] When the mineral is basic, i.e., when the mineral can react with free carboxyl groups, for example, when the mineral is a carbonate such as an alkaline earth metal carbonate (e.g., calcium carbonate, magnesium carbonate, and precipitated hydromagnesite), it is particularly advantageous to carry out the said sub-steps (b1) to (b3) for the method of manufacturing the sheet-like element component according to the fourth aspect of the present invention. In this case, the said sub-steps (b1) to (b3) can be used for the provision of the oxygen scavenger in step (b) of the method of manufacturing the kit for improving the shelf life according to the third aspect of the present invention.

[0237] The inventors have found that oxygen scavengers containing free carboxylic acids have the ability to react with basic minerals (e.g., calcium carbonate), which may damage their structure and ultimately result in a coating layer with reduced porosity. Such a coating layer accepts a smaller amount of the aqueous alkaline component and is thus less effective as an oxygen scavenging element. Therefore, the precursor of the oxygen scavenger containing free carboxylic acid is most preferably essentially completely deprotonated by reaction with a basic compound before its incorporation into the coating layer of the sheet-like element component of the present invention.

[0238] The basic compound may be any compound that is basic enough to essentially completely deprotonate the carboxyl groups of the oxygen scavenger precursor. Preferably, the basic compound is selected such that the reaction by-products are water and optionally a gas. Therefore, preferred basic compounds include carbonate bases, hydroxide bases, bicarbonate bases (hydrogen carbonate bases), amine bases, and mixtures thereof. More preferably, the basic compound is selected from the group consisting of sodium carbonate, sodium bicarbonate, sodium hydroxide, potassium carbonate, potassium bicarbonate, potassium hydroxide, calcium carbonate, calcium bicarbonate, calcium hydroxide, magnesium carbonate, magnesium bicarbonate, magnesium hydroxide, ammonia, and mixtures thereof, and most preferably calcium carbonate.

[0239] It is understood that the calcium carbonate is preferably not surface-reacted calcium carbonate, that is, it does not contain a hydrophobized treatment layer on its surface and / or no significant amount of grinding aid adheres thereto.

[0240] During step (b3), the basic compound is preferably added to the oxygen scavenger precursor in a molar amount of 50% to 110%, preferably 80% to 100%, more preferably 90% to 100%, even more preferably 95% to 100%, still more preferably 98% to 100%, and most preferably 98% to 100% with respect 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 in step (e).

[0241] In a preferred embodiment of the present invention, the method for manufacturing a sheet-like element component includes the following steps: (a) Providing a granular filler containing a mineral, preferably a mineral that is an alkaline earth metal mineral, a silicate, or a mixture thereof, more preferably a granular filler containing a mineral that is precipitated hydromagnesite, ground natural calcium carbonate, precipitated calcium carbonate, or a mixture thereof, in an amount exceeding 50% by weight based on the total amount of the granular filler, where the mineral is not surface-reacted calcium carbonate, the surface-reacted calcium carbonate is a reaction product of natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + ion donors, where the carbon dioxide is formed in situ by treatment with the H3O + ion donors and / or supplied from an external source; (b) Providing at least one oxygen scavenger selected from the group consisting of a phenolic acid derivative having at least two phenolic hydroxyl groups arranged ortho or para to each other, a cinnamic acid derivative having at least two phenolic hydroxyl groups arranged ortho or para to each other, and mixtures thereof, wherein the acid derivatives are the acids in which each acid is essentially completely deprotonated; (c) Providing a polymer binder; (d) Providing a substrate layer comprising one or more individual substrate layers, or a food package comprising said substrate layer; (e) Mixing the oxygen scavenger of step (b), the particulate filler of step (a), and the polymer binder of step (c) in the order described herein 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 component; Here, the step (b) of providing the at least one oxygen scavenger includes the following sub-steps: (b1) Providing at least one oxygen scavenger precursor selected from the group consisting of a phenolic acid having at least two phenolic hydroxyl groups arranged ortho or para to each other, a cinnamic acid having at least two phenolic hydroxyl groups arranged ortho or para to each other, and mixtures thereof; (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.

[0242] In another preferred embodiment of the present invention, the method for manufacturing a sheet-like element component includes the following steps: (a) Providing a particulate filler comprising a mineral that is at least 70% by weight, based on the total amount of the particulate filler, of precipitated hydromagnesite, ground natural calcium carbonate, precipitated calcium carbonate, or a mixture thereof, wherein the mineral is not surface-reacted calcium carbonate, the surface-reacted calcium carbonate is a reaction product of natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + ion donors, wherein the carbon dioxide is formed in situ by treatment with the H3O + ion donors and / or supplied from an external source, and preferably the surface-reacted calcium carbonate has a specific surface area in the range of 20 to 200 m 2 / g, preferably 50 to 120 m 2 / g, as measured by the BET method; (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, kebrinic acid derivatives, phloroglucinol carboxylic acid derivatives, chicoric acid derivatives, and mixtures thereof, more preferably wherein the at least one oxygen scavenger is a gallic acid derivative, wherein the acid derivatives are essentially fully deprotonated acids of the respective acids; (c) Providing a polymer binder; (d) Providing a substrate layer comprising one or more individual substrate layers, or a food package comprising the substrate layer; (e) Mixing the oxygen scavenger of step (b), the particulate filler of step (a), and the polymer binder of step (c) in the order described herein 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 component; Here, the step (b) of providing the at least one oxygen scavenger includes the following sub-steps: (b1) providing at least one precursor of an oxygen scavenger selected from the group consisting of 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; more preferably, the at least one oxygen scavenger is gallic acid, (b2) providing a basic compound selected from the group consisting of carbonate bases, hydroxide bases, bicarbonate bases, amine bases, and mixtures thereof; 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; most preferably calcium carbonate, 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.

[0243] A fifth aspect of the present invention relates to a method of activating the sheet-like element component of the present invention in the kit of the present invention. This method includes the following steps: (j) mixing the alkaline component and water to obtain an aqueous alkaline component containing the base and water, and (k) applying the aqueous alkaline component to at least a part of the surface of the coating layer.

[0244] It should be understood that the sheet-like element component of the present invention is as described above and can be obtained by any one of the methods described herein. Further, the kit, alkaline component, aqueous alkaline component, base, and coating layer are as described above. This method preferably leads to obtaining an activated sheet-like element as described above.

[0245] Preferably, based on the molar amount of the oxygen scavenger, the alkaline component is added or applied in an amount such that a base is added in an amount of at least 0.01 molar equivalent, preferably at least 0.02 molar equivalent, more preferably at least 0.05 molar equivalent, and even more preferably at least 0.1 molar equivalent, and / or based on the total weight of the coating layer, the alkaline component is added in an amount of 10 to 70% by weight, preferably 20 to 65% by weight, more preferably 35 to 60% by weight.

[0246] The application step (k) can be carried out by any means known to those skilled in the art on at least a part of the surface of the coating layer, preferably by inkjet printing, spraying, coating, vapor deposition and / or dipping. In one embodiment, the application step (k) is carried out by coating. It should be understood that the aqueous alkaline component can be applied by any coating means known to those skilled in the art, and this coating means includes, but is not limited to, roller coating, dip coating, rod coating, grooved rod coating, curtain coating, rigid blade coating, applicator roll coating, fountain coating, jet coating, short doel coating, slot die coating, curved blade coating, inclined blade coating, air knife coating, bar coating, gravure coating, conventional or metered size press coating, spray coating technology, spin coating, screen printing and / or wet stack coating, preferably including dip coating, slot die coating and / or spin coating.

[0247] In a preferred embodiment, the application step (k) is carried out by inkjet printing, spraying, coating, and / or dipping. 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 layer from above or from below.

[0248] The application step (k) can be carried out immediately after the production of the sheet-like element, i.e., already at the production site. In this case, it is preferable to apply the oxygen-permeable protective layer described above to the activated sheet-like element or to store the activated sheet-like element in the supply device as described below to prevent the capture of oxygen in the activated sheet-like element before it is incorporated into the food package.

[0249] However, it is particularly preferred to carry out the application step (k) immediately before or shortly before installing the activated sheet-like element inside the food package. In this way, premature oxygen capture is effectively avoided. In other words, it is preferable to transport and store the sheet-like element and the kit in an inactivated state.

[0250] Optionally, the method of the present invention further includes a printing step (l). Patterns, logos, texts or other information can be printed on the sheet-like element. The printing ink can be applied to the coating layer of the present invention and / or on the opposite side of the coating layer of the present invention on the substrate layer. In the latter option, it is preferable that the outermost individual substrate layer is a printing-receptive coating layer as described above. Printing methods suitable for use in the present invention include inkjet, offset, flexographic printing and gravure printing.

[0251] Optionally, the method of the present invention further includes a cutting step (m). The sheet-like element can be cut into a plurality of pieces having a predetermined size. The size of the pieces is adjusted according to the specific needs of the field of use, for example, the size of the food package or the type of food product. The coated area or size of the pieces can be 3 to 200 cm 2 , preferably 4 to 150 cm 2 , more preferably 5 to 100 cm 2 . The sheet-like element according to one embodiment can have a coated area or size of 3 to 8 or 5 to 10 cm 2 .

[0252] Supply device of the present invention The kit of the present invention can further include a supply device that includes the sheet-like element component of the present invention, where the supply device preferably includes a roll or a magazine. Further, a sixth aspect of the present invention relates to a supply device that includes the activated sheet-like element of the present invention, where this supply device protects the activated sheet-like element from oxygen and preferably includes a roll, a stack, a magazine, or a package, such as a box.

[0253] The supply device includes the sheet-like element component or the activated sheet-like element of any of the above-described aspects of the present invention. Preferably, the supply device includes a roll or a magazine that includes the sheet-like element. The supply device can be a label dispenser or a label applicator that includes this roll and / or magazine. However, the supply device may include a sheet that includes at least two sheet-like elements of the present invention. Therefore, it is preferable that the sheet-like element can be reversibly and non-destructively removed from the supply device.

[0254] Therefore, the sheet-like element can be easily delivered and provided just at the place of use.

[0255] Food package of the present invention The kit of the present invention can further include a food package that includes the sheet-like element component, where the coating layer is present within this food package. Further, a seventh aspect of the present invention relates to a food package that includes the activated sheet-like element of the present invention, where the coating layer is present within the food package. It is recognized that the sheet-like element and the coating layer are as defined above.

[0256] An aqueous alkaline composition is applied to the sheet-like element or coating layer within the food package of the present invention before, during, or after filling the food product into the food package of the present invention. The activated sheet-like element is installed within the food package before, during, or after filling the food product into the food package.

[0257] In a preferred embodiment, the food package containing the activated sheet-like element of the present invention further comprises a modified atmosphere. Modified atmosphere packaging (MAP; also referred to as gas replacement packaging) of food products is well known to those skilled in the art. The atmosphere within the food package initially contains a low level of oxygen, i.e., less than 20% by volume, more preferably less than 5% by volume, and most preferably less than 2% by volume based on the total volume of the package atmosphere, which is further reduced by the oxygen scavenging activity of the activated sheet-like element of the present invention. The modified atmosphere preferably consists essentially of nitrogen and carbon dioxide, preferably in a volume ratio of nitrogen to carbon dioxide of 10:90 to 90:10, more preferably 20:80 to 80:20, and most preferably 30:70 to 70:30, such as about 70:30 or about 60:40 or about 50:50. It is recognized that after filling the food package with the activated sheet-like element, the food product, and optionally the modified atmosphere, the food package of the present invention is closed or sealed. The food package can be closed or sealed by any means known to those skilled in the art.

[0258] Alternatively or additionally, the atmosphere of the food package contains a relative humidity in the range from above 0 to 100%. The activated sheet-like element of the present invention effectively scavenges oxygen at a relative humidity in the range of 30 - 100% rH, preferably 50 - 100% rH.

[0259] In a preferred embodiment of the present invention, the food package is sealed by heat sealing, pressure sealing and / or ultrasonic welding, more preferably in combination with a sealant. Preferred sealants for use in the present invention include pressure-sensitive adhesives selected from the group consisting of permanent pressure-sensitive adhesives, removable pressure-sensitive adhesives, and resealable pressure-sensitive adhesives, preferably resealable pressure-sensitive adhesives.

[0260] Inside the food package of the present invention, the activated sheet-like element captures oxygen, thus preventing or delaying food spoilage and / or increasing the shelf life of foodstuffs.

[0261] The present invention is not limited to any particular type of foodstuff. In one embodiment of the present invention, the foodstuff is selected from the group comprising fresh and processed meat, poultry, beef, pork, ham, sausage, dried meat; fresh and processed fish; dairy products such as cheese, for example sliced cheese or powdered cheese; bakery products such as bread, toasted bread, cakes, cookies; snacks; nuts and oilseeds; vegetables; confectionery; instant foods; and liquid and solid foodstuffs including beverages such as juice, particularly orange juice.

[0262] The inventors have found that the combined use of the activated sheet-like element of the present invention and MAP has a synergistic effect on extending the shelf life of foodstuffs. Most importantly, unexpectedly, the activated sheet-like element of the present invention retains its oxygen scavenging activity in the presence of CO2, despite the fact that CO2 has a tendency to inactivate the oxygen scavengers used in the present invention when the oxygen scavenger is not in the form of the sheet-like element of the present invention.

[0263] In a preferred embodiment of the present invention, the food package of the present invention is a kit comprising: (a) A sheet-like element component having: (a1) A coating layer present within the food package, comprising: (i) Based on the total dry weight of the coating layer, a granular filler in an amount of 25 to 70% by weight, where the granular filler contains, based on the total amount of the granular filler, a mineral in an amount exceeding 50% by weight, preferably a mineral that is an alkaline earth metal mineral, a silicate, or a mixture thereof, the mineral is not surface-reacted calcium carbonate, the surface-reacted calcium carbonate is a reaction product of natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + ion donors, where the carbon dioxide is formed in situ by treatment with the H3O + ion donors and / or supplied from an external source; (ii) Based on the total dry weight of the coating layer, a polymer binder in an amount of 5 to 25% by weight; and (iii) Based on the total dry weight of the coating layer, at least one oxygen scavenger in an amount of 25 to 70% by weight, where the at least one oxygen scavenger is selected from the group consisting of phenolic acids having at least two phenolic hydroxyl groups arranged ortho or para to each other, cinnamic acids having at least two phenolic hydroxyl groups arranged ortho or para to each other, their derivatives, and mixtures thereof, the derivatives of the acids are selected from the group consisting of alkyl esters, aryl esters of the respective acids, and essentially fully deprotonated acids; and (a2) A substrate layer, and (b) An alkaline component having a pK b value of 6 or lower and containing a base selected from the group consisting of hydroxide bases, carbonate bases, ammonia bases, and mixtures thereof.

[0264] In another preferred embodiment of the present invention, the food package of the present invention is a kit comprising: (a) A sheet-like element component having: (a1) A coating layer present within the food package, comprising: (i) Based on the total dry weight of the coating layer, a particulate filler in an amount of 25 to 70% by weight, wherein the particulate filler comprises, based on the total amount of the particulate filler, a mineral in an amount of at least 70% by weight, preferably a mineral that is an alkaline earth metal mineral, a silicate, or a mixture thereof, more preferably a mineral that is precipitated hydro-magnesite, ground natural calcium carbonate, precipitated calcium carbonate, or a mixture thereof, the mineral is not surface-reacted calcium carbonate, the surface-reacted calcium carbonate is a reaction product of natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + ion donors, wherein the carbon dioxide is formed in situ and / or supplied from an external source by treatment with the H3O + ion donors; (ii) Based on the total dry weight of the coating layer, a polymer binder in an amount of 5 to 25% by weight, 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 (iii) Based on the total dry weight of the coating layer, at least one oxygen scavenger in an amount of 25 to 70% by weight, wherein the at least one oxygen scavenger is selected from the group consisting of gallic acid, digallic acid, protocatechuic acid, caffeic acid, 5-hydroxyferulic acid, gentisic acid, orsellinic acid, cembric acid, phloroglucinol carboxylic acid, chicoric acid, their derivatives, and mixtures thereof, and more preferably, the at least one oxygen scavenger is gallic acid or a derivative thereof, the derivatives of the acids are selected from the group consisting of alkyl esters, aryl esters of the respective acids, and essentially fully deprotonated acids; and (a2) a substrate layer, and (b) An alkaline component containing 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.

[0265] In yet another preferred embodiment of the present invention, the food package of the present invention is a kit comprising: (a) A sheet-like element component having: (a1) A coating layer present within the food package, comprising: (i) A granular filler in an amount of 25 to 70% by weight based on the total dry weight of the coating layer, wherein the granular filler comprises a mineral that is at least 90% by weight of sedimentary hydro-magnesite based on the total amount of the granular filler; (ii) A polymer binder in an amount of 5 to 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 (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 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, keblinic acid derivatives, phloroglucinol carboxylic acid derivatives, chicoric acid derivatives, and mixtures thereof, and more preferably, the at least one oxygen scavenger is a gallic acid derivative, The derivative of the acid is selected from the group consisting of alkyl esters, aryl esters and essentially fully deprotonated acids of the respective acids, and preferably selected from the group consisting of sodium ions, potassium ions, calcium ions, magnesium ions, and mixtures thereof, most preferably including calcium cations; and (a2) a substrate layer, and (b) an alkaline component containing 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.

[0266] Use of the present invention The eighth aspect of the present invention relates to the use of the kit of the present invention and / or the activated sheet-like element of the present invention in food packaging. The ninth aspect of the present invention relates to the use of the kit of the present invention or the activated sheet-like element of the present invention for extending the shelf life of food.

[0267] It is recognized that the kit, the activated sheet-like element and the food packaging are as described above.

[0268] As described in detail above, the activated sheet-like element of the present invention carrying an alkaline component effectively and rapidly captures oxygen from the atmosphere in the upper space of a food package. The presence of oxygen promotes the growth of pathogenic microorganisms, particularly bacteria, fungi, and molds, such as Campylobacter jejuni, Escherichia coli, Listeria monocytogenes, Salmonella spp., Salmonella enterica, Listeria innocua, Lactobacillus sakei, Brochothrix thermosphacta, Clostridium perfringens, Clostridium botulinum, Campylobacter spp., Staphylococcus aureus, Streptococcus, Norovirus, Toxoplasma gondii, Cyclospora spp., Bacillus cereus, Cronobacter sakazakii, Shigella spp., Vibrio spp., Vibrio cholerae, Vibrio parahaemolyticus, Vibrio vulnificus, Yersinia enterocolitica, Yersinia pseudotuberculosis, Brucella spp.) are associated with the growth of 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 virus, Cyclospora cayetanensis, and Trichinella spiralis. The presence of oxygen also causes flavor degradation or rancidity by oxidation and discoloration of foods, such as a decrease in the red color of meat products. Discoloration is particularly relevant when food products are stored under lighting. This adverse effect of the presence of oxygen not only endangers edibility but also impairs appearance, texture, and taste, thus losing consumer support and ultimately limiting or reducing the shelf life of the food. Oxygen scavenging activity also prevents or reduces the degradation of vitamin C in juices such as orange juice.

[0269] The activated sheet-like elements of the present invention contain an oxygen scavenger in an amount sufficient to obtain the desired reduction in oxygen in a food package, and those skilled in the art can adjust, as taught herein, for example, the size of the sheet-like element, the composition and amount of the coating layer present on the substrate layer, and the amount of base carried by the sheet-like elements of the present invention to thereby obtain the desired effect in the food package.

[0270] For example, each amount may include at least one oxygen scavenger above 1 cm of headspace. 3 0.0005 to 10 mg per cm, preferably 0.001 to 5 mg per cm 3 , more preferably 0.005 to 2 mg / cm 3 or 0.01 to 1 mg / cm 3 Additionally or alternatively, each amount may be adjusted so that the coating layer is present in the food package in an amount of 1 cm 3 0.05~10cm per 2 , preferably 0.1 to 5 cm 2 / cm 3 , more preferably 0.2 to 2 cm 2 / cm 3 , for example, about 0.25 cm 2 / cm 3 For purposes of this invention, the "headspace" of a food package is considered to be the amount of gas (e.g., air or modified atmosphere) present within the food package.

[0271] Preferably, the foodstuff is stored at temperatures typical for storage of chilled or frozen foodstuffs, i.e. between 0° C. and 14° C., preferably between 3° C. and 10° C., more preferably between 4° C. and 7° C., for example 7±1° C. However, the foodstuff can also be stored at room temperature, i.e. between 15° C. and 30° C., preferably between 18° C. and 25° C., for example between 18° C. and 22° C. Thus, the shelf life of the foodstuff in the food package can be extended.

[0272] In a preferred embodiment of the present invention, the activated sheet-like element of the present invention captures at least 90%, preferably at least 95% of the oxygen from the upper space of the food package within 12 hours at 20 ± 2°C.

[0273] In another preferred embodiment of the present invention, the activated sheet-like element of the present invention captures at least 90%, preferably at least 95% of the oxygen from the upper space of the food package within 48 hours, preferably within 24 hours, more preferably within 12 hours, and most preferably within 6 hours at 4 ± 2°C.

[0274] In another preferred embodiment, the activated sheet-like element of the present invention is used to keep the oxygen content in the upper space of the food package below 0.5% by volume, preferably below 0.2% by volume, more preferably below 0.1% by volume during storage for at least 21 days.

[0275] In yet another embodiment of the present invention, the activated sheet-like element of the present invention is used in combination with modified atmosphere packaging (MAP) as described above, thereby achieving a synergistic oxygen capture effect and a synergistic effect on extending the shelf life. Therefore, in a particularly preferred embodiment of the present invention, the activated sheet-like element of the present invention captures at least 90%, preferably at least 95% of the residual oxygen from the modified atmosphere in the upper space of the food package within 12 hours at 20 ± 2°C.

[0276] In another preferred embodiment, the activated sheet-like element of the present invention is used to keep the oxygen content in the modified atmosphere in the upper space of the food package below 0.5% by volume, preferably below 0.2% by volume, more preferably below 0.1% by volume during storage for at least 21 days.

[0277] The scope and advantages of the present invention will be better understood based on the following examples which are intended to illustrate and are non-limiting of some embodiments of the present invention.

Example

[0278] Materials and methods Gallic acid was purchased from Acros Organics as the monohydrate. Acronal 500D was purchased from BASF. Untreated calcium carbonate 1: marble from Italy; d 50 (vol) = 1.83 μm, d 98 (vol) = 7 μm (Malvern 3000; dry) Dispersant: polyacrylate dispersant 100% neutralized with sodium having a molecular weight M of about 4500 g / mol w and a polydispersity index IP of 1.6 (2 g, solids content 42%). Binder: Acronal 500D: polyacrylate binder (15 g, solids content 46% by weight).

[0279] Preparation of coating formulation 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. The dispersant (2 g) was added, and the mineral (50 g) was dispersed into this formulation little by little. The pH of the binder (15 g) was adjusted to pH 8.5 and added to the above formulation. The coating formulation was stirred for an additional 15 minutes until use. Typically, this coating formulation is characterized by a solids content of 40%, a pH of 6.2, and a viscosity of 170 mPa·s (100 RPM).

[0280] Preparation of sheet-like element precursor A PET folio (Hostaphan RN100, 100 μm, Puetz Folien) was coated with a Durrer coater (see Figure 1). The following parameters were used to apply the coating formulation: Rod C50, rod pressure (1 bar), IR and air dryer (set at 150 °C), and a speed of 5 m / min. The coating was applied at 30 g / m 2 2.

[0281] Oxygen scavenging activity (OSA) of sheet-like element According to the above mechanical coating method, a sheet-like element containing a gallic acid-based coating layer containing various minerals described in Table 1 was prepared with a coating weight of 22 g / m 2 , and cut into a plurality of rectangular pieces of 6×11 cm. In an atmosphere containing 98% by volume of N2 and 2% by volume of O2, together with an oxygen sensor spot (type PSt 6, PreSens Precision Sensing GmbH, Regensburg, Germany), an empty high-barrier tray (PS-EVOH-PE with 0.5 mm peel, 204×147 mm, height 14 mm, Staeger&Co AG, Muri, Switzerland: volume 350 cm 3 ), a plurality of sheet-like elements were separately packaged using a tray sealer T200 (MULTIVAC (Hünenberg, Switzerland)). A glass Petri dish filled with water was also added to the tray to provide a relative humidity of approximately 100%. Glass beads were added to set the volume of the space formed at the top to 250 cm 3 . The relative humidity was observed with a hygrometer (testo 174H, Testo SE&Co.KGaA, Lenzkirch, Germany).

[0282] Before sealing, a 1M potassium carbonate solution (130 μL ± 10 μL each) was added to each sheet-like element via an E2 EUR spray table system (Nortson EFD). The packaged and sealed trays were stored at 21°C, and the oxygen concentration was measured non-destructively using a fiber optic Fibox 4 trace (PreSens Precision Sensing GmbH, Regensburg, Germany). Each measurement was repeated twice. The results were averaged and summarized in Table 2.

[0283]

Table 1

[0284] The sheet-like element was subjected to an oxygen scavenging activity test as described in the above examples. The results are summarized in Table 2.

[0285]

Table 2

[0286] Further aspects and embodiments of the present invention are described below:

[0287] Aspect or Embodiment 1: A kit for improving the shelf life of food, comprising: (a) A sheet-like element component having: (a1) A coating layer comprising: (i) A granular filler in an amount of 25 to 70% by weight based on the total dry weight of the coating layer, wherein the granular filler contains a mineral in an amount exceeding 50% by weight based on the total amount of the filler, preferably an alkaline earth metal mineral, a silicate, or a mixture thereof, the mineral is not surface-reacted calcium carbonate, the surface-reacted calcium carbonate is a reaction product of natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + ion donors, wherein the carbon dioxide is formed in situ by treatment with the H3O + ion donors and / or supplied from an external source; (ii) A polymer 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 phenyl ring having at least two phenolic hydroxyl groups and at least one R group, Two of the at least two phenolic hydroxyl groups are ortho or para to each other and are located on the at least one phenyl ring, and 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 -Y-R 1 group, preferably, R is -Y-R 1 group, where -Y is selected from the group consisting of 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 aryloxycarbonyl group, or an essentially fully deprotonated carboxyl group; and (a2) a substrate layer, and (b) an alkaline component containing a base having a pK b value of 6 or lower.

[0288] 2. The kit according to embodiment 1, wherein the sheet-like element component includes the following coating layer: - having a total intrusion ratio pore volume in the range of 0.1 to 1.5 cm 3 / g, preferably 0.1 to 1.0 cm 3 / g as measured by mercury intrusion porosimetry, and / or - having a total intra-particle intrusion ratio pore volume in the range of 0.05 to 1.0 cm 3 / g, preferably 0.08 to 0.5 cm 3 / g, more preferably 0.1 to 0.4 cm 3 / g as measured by mercury intrusion porosimetry, and / or - having a total inter-particle intrusion ratio pore volume in the range of 0.05 to 0.5 cm 3 / g, preferably 0.08 to 0.4 cm 3 / g, more preferably 0.1 to 0.3 cm 3 / g as measured by mercury intrusion porosimetry, and / or - having a total pore volume of 0.05 to 0.4 cm 3 / g, preferably 0.08 to 0.3 cm 3 / g, more preferably 0.1 to 0.2 cm 3 / g, having a total occlusion penetration pore volume in the range of and / or - On the substrate layer, 1 to 200 g / m 2 , preferably 2 to 150 g / m 2 , more preferably 10 to 120 g / m 2 present in an amount of coating layer.

[0289] 3. The kit according to any of the foregoing embodiments, wherein the coating layer comprises the following: - Based on the total dry weight of the coating layer, the polymer binder in an amount of 10 to 20% by weight, and / or - Based on the total dry weight of the coating layer, the granular filler in an amount of 30 to 60% by weight, and / or - Based on the total dry weight of the coating layer, the oxygen scavenger in an amount of 30 to 60% by weight.

[0290] 4. The kit according to any of the foregoing embodiments, wherein the mineral is not calcium carbonate other than ground natural calcium carbonate and precipitated calcium carbonate, preferably the mineral is not calcium carbonate other than ground natural calcium carbonate.

[0291] 5. The kit according to any of the foregoing embodiments, wherein the granular filler comprises at least 70% by weight, preferably at least 90% by weight, of minerals based on the total weight of the granular filler, and most preferably consists of minerals.

[0292] 6. 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 the group consisting of carbonates, phosphates, sulfates, oxides, hydroxides of calcium and / or magnesium, and mixtures thereof, More preferably, the alkaline earth metal mineral is selected from the group consisting of calcium carbonate, magnesium carbonate, and mixtures thereof. Most preferably, the alkaline earth metal mineral is selected from the group consisting of precipitated hydromagnesite, ground natural calcium carbonate, and precipitated calcium carbonate. The kit according to any one of the foregoing embodiments.

[0293] 7. The mineral is a silicate, preferably selected from the group consisting of aluminosilicates, alkaline earth metal-containing silicates, and mixtures thereof. More preferably, it is selected from the group consisting of zeolite, perlite, kaolin, bentonite, calcined clay, and mixtures thereof. The kit according to any one of the foregoing embodiments.

[0294] 8. The mineral is - having a specific surface area in the range of 20 to 200 m 2 / g, preferably 50 to 120 m 2 / g, as measured by the BET method according to ISO 9277:2010, and / or - having a total intruded ratio pore volume in the range of 0.1 to 2.5 cm 3 / g, preferably 0.2 to 2.2 cm 3 / g, more preferably 0.4 to 2.0 cm 3 / g, most preferably 0.6 to 1.8 cm 3 / g, as measured by mercury intrusion porosimetry, and / or - having a total intrusion ratio pore volume in the range of 0.1 to 6 cm 3 / g, preferably 1 to 5 cm 3 / g, more preferably 2 to 5 cm 3 / g, most preferably 2.5 to 5 cm 3 / g, as measured by mercury intrusion porosimetry. The kit according to any one of the foregoing embodiments.

[0295] 9. The granular filler contains, as the mineral, precipitated hydromagnesite in an amount exceeding 50% by weight based on the total amount of the filler, preferably, the granular filler contains precipitated hydromagnesite in an amount of at least 70% by weight, preferably at least 90% by weight, based on the total amount of the granular filler, and most preferably, the granular filler consists of precipitated hydromagnesite, any additional granular filler material present is selected from the group consisting of dolomite, ground calcium carbonate, precipitated calcium carbonate, magnesium hydroxide, talc, gypsum, titanium dioxide, kaolin, silicate, mica, barium sulfate, fired clay, unfired (hydrous) clay, bentonite, and mixtures thereof, preferably selected from the group consisting of ground calcium carbonate, precipitated calcium carbonate, and mixtures thereof, and most preferably, the granular filler consists of the optional additional granular filler material and precipitated hydromagnesite, A kit according to any of the foregoing embodiments.

[0296] 10. The precipitated hydromagnesite - has a specific surface area in the range of 20 - 200 m 2 / g, preferably 50 - 120 m 2 / g, as measured by the BET method according to ISO 9277:2010, and / or - has a total pore volume of intrusion of mercury porosimetry in the range of 0.1 - 2.5 cm 3 / g, preferably 0.2 - 2.2 cm 3 / g, more preferably 0.4 - 2.0 cm 3 / g, most preferably 0.6 - 1.8 cm 3 / g, A kit according to embodiment 9.

[0297] 11. A kit according to any of the foregoing embodiments, - The at least one oxygen scavenger is selected from the group consisting of phenolic acids having at least two phenolic hydroxyl groups arranged ortho or para to each other, cinnamic acids having at least two phenolic hydroxyl groups arranged ortho or para to each other, derivatives thereof, and mixtures thereof. Preferably, the at least one oxygen scavenger is selected from the group consisting of gallic acid, digallic acid, protocatechuic acid, caffeic acid, 5-hydroxyferulic acid, gentisic acid, orsellinic acid, kebric 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. Here, the derivatives of the acids are each selected from the group consisting of alkyl esters, aryl esters of the respective acids, and essentially fully deprotonated acids. Most preferably, the at least one oxygen scavenger is essentially fully deprotonated gallic acid, and / or - The at least one oxygen scavenger containing an essentially fully deprotonated carboxyl group contains a cation selected from the group consisting of ammonium, sodium, lithium, potassium, cesium, magnesium, calcium, and mixtures thereof. Preferably, the at least one oxygen scavenger contains a cation selected from the group consisting of sodium, potassium, calcium, magnesium, and mixtures thereof. Most preferably, the at least one oxygen scavenger contains a calcium cation. The kit according to any of the foregoing embodiments.

[0298] 12. The polymer binder is selected from the group consisting of polyacrylic acid, salts thereof, derivatives thereof, starch, protein, styrene-butadiene latex, polyvinyl alcohol, polyvinyl acetate, and mixtures thereof. Preferably, the polymer binder is selected from polyacrylic acid, salts thereof, derivatives thereof, and mixtures thereof. The kit according to any of the foregoing embodiments.

[0299] 13. The base material layer includes one or more individual base material layers selected from the group consisting of a polymer material layer, preferably a polymer material layer made of polyethylene, polypropylene, polyethylene terephthalate, polylactic acid, polyhydroxybutyric acid, polyethylene-2,5-furandicarboxylate, polystyrene or a mixture thereof, a fiber material layer, preferably a fiber material layer 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 fabric layer, a layer made of a biomaterial, a wood layer, a bamboo layer, a metal foil layer, an aluminum layer, a printing receptive coating layer, and a mixture of the above. The one or more individual base material layers are optionally corona-treated and Preferably, the one or more individual base material layers are selected from the polymer material layer. The kit according to any of the foregoing embodiments.

[0300] 14. The kit according to any of the foregoing embodiments, wherein the sheet-like element component further comprises: - One or more adhesive layers located on the base material layer on the opposite side of the coating layer and / or between the individual base material layers, preferably one or more adhesive layers selected from the group consisting of an adhesive, a sealant, a rubber coating, a pressure-sensitive layer, and a mixture of the above, and / or - One or more primer layers located between the base material layer and the coating layer, and / or - One or more oxygen-permeable coating layers for coating the coating layer, preferably one or more oxygen-permeable coating layers selected from the group consisting of an oxygen-permeable film layer, a fiber material layer, and a non-woven fiber layer, and / or - One or more protective layers for temporarily sealing the coating layer and / or the adhesive layer, preferably one or more protective layers selected from polyethylene, polypropylene, and / or coated paper. The kit according to any of the foregoing embodiments, preferably, wherein the sheet-like element component further comprises the following: - One or more oxygen-permeable coating layers for coating the coating layer, preferably, one or more oxygen-permeable coating layers selected from the group consisting of an oxygen-permeable film layer, a fiber material layer, and a non-woven fiber layer, and / or - One or more protective layers for temporarily sealing the coating layer and / or the adhesive layer, preferably, one or more protective layers selected from polyethylene, polypropylene, and / or coated paper.

[0301] 15. The kit according to any of the foregoing embodiments, wherein the alkali component comprises a base selected from the group consisting of a hydroxide base, a carbonate base, an ammonia base, and mixtures thereof, preferably, the base is selected from the group consisting of lithium hydroxide, sodium hydroxide, potassium hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, cesium carbonate, and mixtures thereof, and most preferably, the base is selected from the group consisting of sodium hydroxide, potassium carbonate, and sodium carbonate.

[0302] 16. The kit according to any of the foregoing embodiments, wherein the alkali component is an aqueous alkali component comprising the base and water, preferably, - The pH of the aqueous alkali 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 alkali component comprises the base in an amount of 1 wt% to 75 wt%, more preferably 5 wt% to 60 wt%, and most preferably 10 to 35 wt% based on the total weight of the aqueous alkali component. The kit according to any of the foregoing embodiments.

[0303] Aspect or Embodiment 17: An activated sheet-like element formed from a kit according to any of the foregoing embodiments, by adding the alkali component to the coating layer of the sheet-like element component, wherein the activated sheet-like element contains a reaction product of the at least one oxygen scavenger and the base, Preferably, - The alkali component is added in an amount of at least 0.01 molar equivalent, preferably at least 0.02 molar equivalent, more preferably at least 0.05 molar equivalent, and even more preferably at least 0.1 molar equivalent, based on the molar amount of the oxygen scavenger, and / or - The alkali component is added in an amount of 10 to 70% by weight, preferably 20 to 65% by weight, more preferably 35 to 60% by weight, based on the total weight of the coating layer, An activated sheet-like element.

[0304] 18. The activated sheet-like element according to embodiment 17, wherein the alkali component contains a base selected from the group consisting of hydroxide bases, carbonate bases, ammonia bases, and mixtures thereof, preferably, the base is selected from the group consisting of lithium hydroxide, sodium hydroxide, potassium hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, cesium carbonate, and mixtures thereof, and most preferably, the base is selected from the group consisting of sodium hydroxide, potassium carbonate, and sodium carbonate.

[0305] 19. The activated sheet-like element according to embodiment 17 or 18, further comprising: - One or more oxygen-permeable coating layers for coating the coating layer, preferably, one or more oxygen-permeable coating layers selected from the group consisting of an oxygen-permeable film layer, a fiber material layer, and a non-woven fiber layer, and / or - One or more protective layers for temporarily sealing the coating layer and / or the adhesive layer, preferably one or more protective layers selected from polyethylene, polypropylene and / or coated paper.

[0306] Aspect or Embodiment 20: A method for manufacturing a kit for improving the shelf life of food, comprising the following steps: (a) Providing a particulate filler containing more than 50% by weight of minerals based on the total amount of the filler, preferably a particulate filler containing minerals which are alkaline earth metal minerals, silicates, or mixtures thereof, wherein the mineral is not surface-reacted calcium carbonate, the surface-reacted calcium carbonate is a reaction product of natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O + ion donors, wherein the carbon dioxide is formed in situ by treatment with the H3O + ion donors and / or supplied from an external source; (b) Providing at least one oxygen scavenger which is a compound having at least one phenyl ring with at least two phenolic hydroxyl groups and at least one R group, wherein two of the at least two phenolic hydroxyl groups are located ortho or para to each other on the at least one phenyl ring, and 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 a -Y-R 1 group, preferably R is a -Y-R 1 group, wherein - Y is selected from the group consisting of a direct bond, a straight-chain 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 aryloxycarbonyl group, a carboxyl group or an essentially fully deprotonated carboxyl group; (c) providing a polymer binder; (d) providing a substrate layer comprising one or more discrete substrate layers, or a food package comprising said substrate layer; (e) mixing the oxygen scavenger of step (b), the particulate filler of step (a) and the polymer binder of step (c) in the order described herein 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 component; (h) providing an alkaline component comprising a base having a pK b value of 6 or lower; and optionally, (i) mixing the alkaline component of step (h) with water to obtain an aqueous alkaline component comprising said 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 wt% to 75 wt%, more preferably 5 wt% to 60 wt%, most preferably 10 to 35 wt% based on the total weight of the aqueous alkaline component.

[0307] Aspect or embodiment 21: A method for manufacturing a sheet-like element component, comprising the following steps: (a) providing a particulate filler comprising more than 50 wt% of a mineral based on the total amount of the filler, preferably a particulate filler comprising a mineral which is an alkaline earth metal mineral, a silicate, or a mixture thereof, wherein 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 +A reaction product with an ion donor, wherein the carbon dioxide is the H3O + Formed in situ by treatment with an ion donor and / or supplied from an external source; (b) Providing at least one oxygen scavenger that is a compound having at least one phenyl ring with at least two phenolic hydroxyl groups and at least one R group, wherein Two of the at least two phenolic hydroxyl groups are located ortho or para to each other on the at least one phenyl ring, and R is a -Y-R 1 Group, where -Y is selected from the group consisting of 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 essentially fully deprotonated carboxyl group; (c) Providing a polymer binder; (d) Providing a substrate layer comprising one or more individual substrate layers, or a food package comprising the substrate layer; (e) Mixing the oxygen scavenger of step (b), the particulate filler of step (a), and the polymer binder of step (c) in the order described herein 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 component; Wherein the step (b) of providing the at least one oxygen scavenger includes the following sub-steps: (b1)Providing at least one oxygen scavenger precursor which is a compound having at least one phenyl ring with at least two phenolic hydroxyl groups and at least one R group, wherein two of the at least two phenolic hydroxyl groups are located ortho or para to each other on the at least one phenyl ring, and R is -Y-R 1 group, wherein -Y is selected from the group consisting of 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 a carboxyl group, (b2)Providing a basic compound, and (b3)Reacting the carboxyl group of the oxygen scavenger precursor in step (b1) with the basic compound in step (b2) to obtain the oxygen scavenger.

[0308] 22. The basic compound in step (b2) is selected from the group consisting of carbonate bases, hydroxide bases, bicarbonate bases, amine bases, and mixtures thereof, 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, most preferably calcium carbonate, The method according to embodiment 21.

[0309] 23. The mineral is not calcium carbonate other than ground natural calcium carbonate and precipitated calcium carbonate, preferably the mineral is not calcium carbonate other than ground natural calcium carbonate, the method according to any one of embodiments 20 to 22.

[0310] 24. The method according to any one of embodiments 20 to 23, - Carry out the mixing step (e) in the presence of a solvent, preferably water, and / or - Carry out the application step (f) using roller coating, dip coating, grooved rod coating, curtain coating, rigid blade coating, applicator roll coating, fountain coating, jet coating, short dwell coating, slot die coating, curved blade coating, inclined blade coating, air knife coating, bar coating, gravure coating, conventional or metered size press coating, spray coating techniques, screen printing and / or wet stack coating, preferably using roller coating, and / or - Carry out the drying step (g) at a temperature in the range of 50 to 150 °C, under ambient pressure or reduced pressure, preferably by hot air drying, IR radiation drying or UV radiation drying. Method.

[0311] 25. The method according to any one of embodiments 20 to 24, wherein the sheet-like element component comprises the following coating layer: - Having a total intrusion ratio pore volume in the range of 0.1 to 1.5 cm 3 / g, preferably 0.1 to 1.0 cm 3 / g, as measured by mercury intrusion porosimetry, and / or - Having a total intra-particle intrusion ratio pore volume in the range of 0.05 to 1.0 cm 3 / g, preferably 0.08 to 0.5 cm 3 / g, more preferably 0.1 to 0.4 cm 3 / g, as measured by mercury intrusion porosimetry, and / or - Having a total inter-particle intrusion ratio pore volume in the range of 0.05 to 0.5 cm 3 / g, preferably 0.08 to 0.4 cm 3 / g, more preferably 0.1 to 0.3 cm 3 / g, as measured by mercury intrusion porosimetry, and / or - Having a total intrusion ratio pore volume in the range of 0.05 to 0.4 cm 3 / g, preferably 0.08 to 0.3 cm3 / g, more preferably 0.1 to 0.2 cm 3 and / or has a total occlusion press-fit pore volume in the range of / g, and / or - On the substrate layer, 1 to 200 g / m 2 , preferably 2 to 150 g / m 2 , more preferably 10 to 120 g / m 2 present in an amount of, coating layer.

[0312] 26. The method according to any one of embodiments 20 to 25, wherein the coating layer comprises the following: - Based on the total dry weight of the coating layer, the polymer binder in an amount of 10 to 20% by weight, and / or - Based on the total dry weight of the coating layer, the particulate filler in an amount of 30 to 60% by weight, and / or - Based on the total dry weight of the coating layer, the oxygen scavenger in an amount of 30 to 60% by weight.

[0313] 27. The particulate filler contains at least 70% by weight, preferably at least 90% by weight of minerals, based on the total amount of the at least one particulate filler, and most preferably, the particulate filler consists of minerals, and any additional particulate filler material present is selected from the group consisting of dolomite, ground calcium carbonate, precipitated calcium carbonate, magnesium hydroxide, talc, gypsum, titanium dioxide, kaolin, silicate, mica, barium sulfate, fired clay, unfired (hydrous) clay, bentonite and mixtures thereof, preferably selected from the group consisting of ground calcium carbonate, precipitated calcium carbonate and mixtures thereof, and most preferably, the particulate filler consists of the optional additional particulate filler material and minerals, The method according to any one of embodiments 20 to 26.

[0314] 28. 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 the group consisting of carbonates, phosphates, sulfates, oxides, hydroxides of calcium and / or magnesium, and mixtures thereof. Even more preferably, the alkaline earth metal mineral is selected from the group consisting of calcium carbonate, magnesium carbonate, and mixtures thereof. Most preferably, the alkaline earth metal mineral is selected from the group consisting of precipitated hydromagnesite, ground natural calcium carbonate, and precipitated calcium carbonate. The method according to any one of Embodiments 19 to 27.

[0315] 29. The mineral is a silicate, preferably selected from the group consisting of aluminosilicates, alkaline earth metal-containing silicates, and mixtures thereof, more preferably selected from the group consisting of zeolites, perlite, kaolin, bentonite, calcined clay, and mixtures thereof. The method according to any one of Embodiments 20 to 29.

[0316] 30. The mineral is - Having a specific surface area in the range of 20 to 200 m 2 / g, preferably in the range of 50 to 120 m 2 / g, measured by the BET method according to ISO 9277:2010, and / or - Having a total pore volume of mercury intrusion porosimetry in the range of 0.1 to 2.5 cm 3 / g, preferably 0.2 to 2.2 cm 3 / g, more preferably 0.4 to 2.0 cm 3 / g, most preferably 0.6 to 1.8 cm 3 / g, measured by mercury intrusion porosimetry, and / or - Having a total pore volume of mercury intrusion porosimetry in the range of 0.1 to 6 cm 3 / g, preferably 1 to 5 cm3 / g, more preferably 2 to 5 cm 3 / g, most preferably 2.5 to 5 cm 3 having a total pressure-impregnated pore volume in the range of / g The method according to any one of Embodiments 20 to 29.

[0317] 31. The granular filler contains, as the mineral, an amount of precipitated hydromagnesite exceeding 50% by weight based on the total amount of the filler, preferably, the granular filler contains an amount of precipitated hydromagnesite of at least 70% by weight, preferably at least 90% by weight, based on the total amount of the granular filler, and most preferably, the granular filler consists of precipitated hydromagnesite, any additional granular filler material present is selected from the group consisting of dolomite, ground calcium carbonate, precipitated calcium carbonate, magnesium hydroxide, talc, gypsum, titanium dioxide, kaolin, silicate, mica, barium sulfate, fired clay, unfired (hydrous) clay, bentonite, and mixtures thereof, preferably selected from the group consisting of ground calcium carbonate, precipitated calcium carbonate, and mixtures thereof, and most preferably, the granular filler consists of the optional additional granular filler material and precipitated hydromagnesite, The method according to any one of Embodiments 20 to 30.

[0318] 32. The precipitated hydromagnesite is - having a specific surface area in the range of 20 to 200 m 2 / g, preferably 50 to 120 m 2 / g as measured by the BET method according to ISO 9277:2010, and / or - having a total intruded pore volume within the particle in the range of 0.1 to 2.5 cm 3 / g, preferably 0.2 to 2.2 cm 3 / g, more preferably 0.4 to 2.0 cm 3 / g, most preferably 0.6 to 1.8 cm 3 / g as measured by mercury intrusion porosimetry, The method according to Embodiment 31.

[0319] 33. The method according to any one of Embodiments 20 to 32, - The at least one oxygen scavenger is selected from the group consisting of phenolic acids having at least two phenolic hydroxyl groups arranged ortho or para to each other, cinnamic acids having at least two phenolic hydroxyl groups arranged ortho or para to each other, derivatives thereof, and mixtures thereof, Preferably, the at least one oxygen scavenger is selected from the group consisting of gallic acid, digallic acid, protocatechuic acid, caffeic acid, 5-hydroxyferulic acid, gentisic acid, orsellinic acid, kebric acid, phloroglucinol carboxylic acid, chicoric acid, derivatives thereof, and mixtures thereof; more preferably, the at least one oxygen scavenger is a gallic acid derivative, wherein the derivative of the acid is selected from the group consisting of alkyl esters, aryl esters, and essentially fully deprotonated acids of each acid, Most preferably, the at least one oxygen scavenger is essentially fully deprotonated gallic acid, and / or - The at least one oxygen scavenger containing an essentially fully deprotonated carboxyl group contains a cation selected from the group consisting of ammonium, sodium, lithium, potassium, cesium, magnesium, calcium, and mixtures thereof, Preferably, the at least one oxygen scavenger contains a cation selected from the group consisting of sodium, potassium, calcium, magnesium, and mixtures thereof, Most preferably, the at least one oxygen scavenger contains a calcium cation, Method.

[0320] 34. The polymer binder is selected from the group consisting of polyacrylic acid, salts thereof, derivatives thereof, starch, protein, styrene-butadiene latex, polyvinyl alcohol, polyvinyl acetate, and mixtures thereof, Preferably, the polymer binder is selected from polyacrylic acid, its salts, its derivatives, and mixtures thereof. The method according to any one of Embodiments 20 to 33.

[0321] 35. The substrate layer includes one or more individual substrate layers selected from the group consisting of a polymer material layer, preferably a polymer material layer made of polyethylene, polypropylene, polyethylene terephthalate, polylactic acid, polyhydroxybutyric acid, polyethylene-2,5-furandicarboxylate, polystyrene, or a mixture thereof, a fiber material layer, preferably a fiber material layer 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 fabric layer, a layer made of a biomaterial, a wood layer, a bamboo layer, a metal foil layer, an aluminum layer, a printing receptive coating layer, and mixtures of the above. The one or more individual substrate layers are optionally corona-treated and Preferably, the one or more individual substrate layers are selected from polymer material layers. The method according to any one of Embodiments 20 to 34.

[0322] 36. The method according to any one of Embodiments 20 to 35, wherein the sheet-like element component further includes: - 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, preferably one or more adhesive layers selected from the group consisting of adhesives, sealants, rubber coatings, pressure-sensitive layers, and mixtures of the above, and / or - One or more primer layers located between the substrate layer and the coating layer, and / or - One or more oxygen-permeable coating layers for coating the coating layer, preferably one or more oxygen-permeable coating layers selected from the group consisting of an oxygen-permeable film layer, a fiber material layer, and a non-woven fiber layer, and / or - One or more protective layers for temporarily sealing the coating layer and / or the adhesive layer, preferably one or more protective layers selected from polyethylene, polypropylene and / or coated paper; Preferably, the method according to any one of Embodiments 20 to 35, wherein the sheet-like element component further comprises: - One or more oxygen-permeable coating layers for coating the coating layer, preferably one or more oxygen-permeable coating layers selected from the group consisting of an oxygen-permeable film layer, a fiber material layer and a non-woven fiber layer, and / or - One or more protective layers for temporarily sealing the coating layer and / or the adhesive layer, preferably one or more protective layers selected from polyethylene, polypropylene and / or coated paper.

[0323] 37. The method according to any one of Embodiments 20 to 36, wherein the alkali component comprises a base selected from the group consisting of hydroxide bases, carbonate bases, ammonia bases and mixtures thereof, preferably the base is selected from the group consisting of lithium hydroxide, sodium hydroxide, potassium hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, cesium carbonate and mixtures thereof, and most preferably the base is selected from the group consisting of sodium hydroxide, potassium carbonate and sodium carbonate.

[0324] 38. The alkali component is an aqueous alkali component comprising the base and water, preferably - The pH of the aqueous alkali 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 alkali component contains the base in an amount of 1% to 75% by weight, more preferably 5% to 60% by weight, and most preferably 10% to 35% by weight based on the total weight of the aqueous alkali component. The method according to any one of Embodiments 20 to 37.

[0325] Aspect or Embodiment 39: A method for activating a sheet element of a kit according to any one of Embodiments 1 to 16, comprising the following steps: (j) Mixing the alkaline component with water to obtain an aqueous alkaline component containing the base and water; and (k) Applying the aqueous alkaline component to at least a part of the surface of the coating layer, where preferably, - Based on the molar amount of the oxygen scavenger, adding the alkaline component in an amount of at least 0.01 molar equivalent, preferably at least 0.02 molar equivalent, more preferably at least 0.05 molar equivalent, even more preferably at least 0.1 molar equivalent of the base, and / or - Based on the total weight of the coating layer, adding the alkaline component in an amount of 10 to 70% by weight, preferably 20 to 65% by weight, more preferably 35 to 60% by weight, and / or - Performing the application step (k) by inkjet printing, spraying, coating, and / or dipping.

[0326] 40. The method according to Embodiment 39, wherein the alkaline component contains a base selected from the group consisting of hydroxide bases, carbonate bases, ammonia bases, and mixtures thereof, preferably, the base is selected from the group consisting of lithium hydroxide, sodium hydroxide, potassium hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, cesium carbonate, and mixtures thereof, and most preferably, the base is selected from the group consisting of sodium hydroxide, potassium carbonate, and sodium carbonate.

[0327] 41. A kit according to any one of Embodiments 1 to 16, further comprising: - A supply device containing the sheet element component, preferably a supply device containing a roll or a magazine, or - A food package containing the sheet element component, wherein the coating layer is present within the food package.

[0328] 42. The kit according to embodiment 41, wherein the sheet-like element component further comprises: - one or more oxygen-permeable coating layers for coating the coating layer, preferably one or more oxygen-permeable coating layers selected from the group consisting of an oxygen-permeable film layer, a fiber material layer, and a non-woven fiber layer, and / or - one or more protective layers for temporarily sealing the coating layer and / or the adhesive layer, preferably one or more protective layers selected from polyethylene, polypropylene, and / or coated paper.

[0329] 43. A supply device comprising the activated sheet-like element according to any one of embodiments 17 to 19, wherein the supply device protects the activated sheet-like element from oxygen and preferably comprises a roll, a stack, a magazine, or a package, such as a box.

[0330] Aspect or embodiment 44: A food package comprising the activated sheet-like element according to any one of embodiments 17 to 19, wherein the coating layer is present within the food package.

[0331] Aspect or embodiment 45: Use of the kit according to any one of embodiments 1 to 16 or the activated sheet-like element according to any one of embodiments 17 to 19 in a food package.

[0332] Aspect or embodiment 46: Use of the kit according to any one of embodiments 1 to 16 or the activated sheet-like element according to any one of embodiments 17 to 19 for extending the shelf life of food.

[0333] Aspect or embodiment 47: A packaged food comprising a food and a food package having the activated sheet-like element according to any one of Embodiments 17 to 19, wherein the coating layer of the activated sheet-like element is present within the food package.

[0334] Aspect or Embodiment 48: The packaged food according to Embodiment 47, wherein the food is selected from the group consisting of 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, confectionery, instant foods and beverages, particularly orange juice.

Claims

1. A kit for improving the shelf life of food, comprising: (a) A sheet-like element component having the following: (a1) A coating layer comprising: (i) A granular filler in an amount of 25 to 70% by weight based on the total dry weight of the coating layer, wherein the granular filler comprises a mineral that is more than 50% by weight of the total amount of the filler, preferably a mineral that is an alkaline earth metal mineral, a silicate, or a mixture thereof, the mineral is not surface-reacted calcium carbonate, The surface-reacted calcium carbonate is a reaction product of natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H ３ O ＋ ion donors, wherein the carbon dioxide is formed in situ by treatment with the H ３ O ＋ ion donors and / or supplied from an external source; (ii) A polymer 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 phenyl ring having at least two phenolic hydroxyl groups and at least one R group, two of the at least two phenolic hydroxyl groups are arranged ortho or para to each other on the at least one phenyl ring, and R is a hydrogen atom, a hydroxyl group, an alkoxy group, an aryloxy group, an amino group, an alkyl group, an aryl group, and -Y-R １ selected from the group consisting of groups, and preferably, R is -Y-R １ group, where -Y is selected from the group consisting of 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 an essentially fully deprotonated carboxyl group; and (a2) A substrate layer, and (b) An alkaline component containing a base having a pK value of 6 or lower. ｂ ​

2. The kit according to claim 1, wherein the sheet-like element component comprises the following coating layer: - Measured by mercury intrusion porosimetry, having a total intrusion ratio pore volume in the range of 0.1 to 1.5 cm ３ / g, preferably 0.1 to 1.0 cm ３ / g, and / or - Measured by mercury intrusion porosimetry to have a total intruded pore volume ratio within the range of 0.05 to 1.0 cm ３ / g, preferably 0.08 to 0.5 cm ３ / g, more preferably 0.1 to 0.4 cm ３ / g, and / or - Measured by mercury intrusion porosimetry, having a total interparticle intrusion ratio pore volume in the range of 0.05 to 0.5 cm ３ / g, preferably 0.08 to 0.4 cm ３ / g, more preferably 0.1 to 0.3 cm ３ / g, and / or - Measured by mercury intrusion porosimetry, having a total occlusion intrusion pore volume in the range of 0.05 to 0.4 cm ３ / g, preferably 0.08 to 0.3 cm ３ / g, more preferably 0.1 to 0.2 cm ３ / g, and / or - on the base material layer, in an amount of 1 to 200 g / m ２ , preferably 2 to 150 g / m ２ , more preferably 10 to 120 g / m ２ and present in such an amount Coating layer.

3. The kit according to claim 1 or 2, wherein the granular filler comprises at least 70% by weight, preferably at least 90% by weight, of a mineral based on the total weight of the granular filler, and most preferably consists of a mineral.

4. The kit according to any one of claims 1 to 3, wherein the mineral is not calcium carbonate other than ground natural calcium carbonate and precipitated calcium carbonate, preferably the mineral is not calcium carbonate other than ground natural calcium carbonate.

5. 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 the group consisting of carbonates, phosphates, sulfates, oxides, hydroxides of calcium and / or magnesium, and mixtures thereof. More preferably, the alkaline earth metal mineral is selected from the group consisting of calcium carbonate, magnesium carbonate, and mixtures thereof. Most preferably, the alkaline earth metal mineral is selected from the group consisting of precipitated hydromagnesite, ground natural calcium carbonate, and precipitated calcium carbonate. The kit according to any one of claims 1 to 4.

6. The mineral is a silicate, preferably selected from the group consisting of aluminosilicates, alkaline earth metal-containing silicates, and mixtures thereof. More preferably, it is selected from the group consisting of zeolite, perlite, kaolin, bentonite, calcined clay, and mixtures thereof. The kit according to any one of claims 1 to 5.

7. The mineral is - Measured by the BET method according to ISO 9277:2010, in the range of 20 to 200 m ２ / g, preferably in the range of 50 to 120 m ２ / g, and / or - Measured by mercury intrusion porosimetry to be 0.1 to 2.5 cm ３ / g, preferably 0.2 to 2.2 cm ３ / g, more preferably 0.4 to 2.0 cm ３ / g, most preferably 0.6 to 1.8 cm ３ / g of the total particle internal intrusion ratio pore volume in the range of, and / or - Measured by mercury intrusion porosimetry to have a total intrusion ratio pore volume in the range of 0.1 to 6 cm ３ / g, preferably 1 to 5 cm ３ / g, more preferably 2 to 5 cm ３ / g, most preferably 2.5 to 5 cm ３ / g. The kit according to any one of claims 1 to 6.

8. - The at least one oxygen scavenger is selected from the group consisting of phenolic acids having at least two phenolic hydroxyl groups arranged ortho or para to each other, cinnamic acids having at least two phenolic hydroxyl groups arranged ortho or para to each other, derivatives thereof, and mixtures thereof. Preferably, the at least one oxygen scavenger is selected from the group consisting of gallic acid, digallic acid, protocatechuic acid, caffeic acid, 5-hydroxyferulic acid, gentisic acid, orsellinic acid, kebrinic acid, phloroglucinolcarboxylic acid, chicoric acid, derivatives thereof, and mixtures thereof. Even more preferably, the at least one oxygen scavenger is a gallic acid derivative. Here, the derivatives of the acid are selected from the group consisting of alkyl esters, aryl esters of each acid, and essentially completely deprotonated acids. Most preferably, the at least one oxygen scavenger is essentially completely deprotonated gallic acid, and / or - The at least one oxygen scavenger containing an essentially completely deprotonated carboxyl group contains a cation selected from the group consisting of ammonium, sodium, lithium, potassium, cesium, magnesium, calcium, and mixtures thereof. Preferably, the at least one oxygen scavenger contains a cation selected from the group consisting of sodium, potassium, calcium, magnesium, and mixtures thereof. Most preferably, the at least one oxygen scavenger contains a calcium cation. The kit according to any one of claims 1 to 7.

9. The alkali component includes a base selected from the group consisting of hydroxide bases, carbonate bases, ammonia bases, and mixtures thereof, Preferably, the base is selected from the group consisting of lithium hydroxide, sodium hydroxide, potassium hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, cesium carbonate, and mixtures thereof, Most preferably, the base is selected from the group consisting of sodium hydroxide, potassium carbonate, and sodium carbonate. The kit according to any one of claims 1 to 8.

10. The alkali component is an aqueous alkali component containing the base and water, Preferably, - the pH of the aqueous alkali 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 alkali component contains the base in an amount of 1% to 75% by weight, more preferably 5% to 60% by weight, and most preferably 10% to 35% by weight based on the total weight of the aqueous alkali component. The kit according to any one of claims 1 to 9.

11. The kit according to any one of claims 1 to 10, wherein the sheet-like element component further comprises: - one or more oxygen-permeable coating layers for coating the coating layer, preferably one or more oxygen-permeable coating layers selected from the group consisting of an oxygen-permeable film layer, a fiber material layer, and a non-woven fiber layer, and / or - one or more protective layers for temporarily sealing the coating layer and / or the adhesive layer, preferably one or more protective layers selected from polyethylene, polypropylene, and / or coated paper.

12. An activated sheet-like element formed from the kit according to any one of claims 1 to 11 by adding the alkali component to the coating layer of the sheet-like element component, The activated sheet-like element contains a reaction product of the at least one oxygen scavenger and the base, Preferably, - Based on the molar amount of the oxygen scavenger, the alkali component is added in an amount of at least 0.01 molar equivalent, preferably at least 0.02 molar equivalent, more preferably at least 0.05 molar equivalent, and even more preferably at least 0.1 molar equivalent, and / or - Based on the total weight of the coating layer, the alkali component is added in an amount of 10 to 70% by weight, preferably 20 to 65% by weight, more preferably 35 to 60% by weight. Activated sheet-like element.

13. A method for manufacturing a kit for improving the shelf life of food, comprising the following steps: a) Providing a granular filler containing more than 50% by weight of minerals based on the total amount of the filler, preferably a granular filler containing minerals which are preferably alkaline earth metal minerals, silicates, or mixtures thereof, wherein the mineral is not surface-reacted calcium carbonate, The surface-reacted calcium carbonate is a reaction product of natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H ３ O ＋ ion donors, wherein the carbon dioxide is formed in situ by treatment with the H ３ O ＋ ion donors and / or supplied from an external source; b) Providing at least one oxygen scavenger which is a compound having at least one phenyl ring having at least two phenolic hydroxyl groups and at least one R group, wherein two of the at least two phenolic hydroxyl groups are located ortho or para to each other on the at least one phenyl ring, and R is a hydrogen atom, a hydroxyl group, an alkoxy group, an aryloxy group, an amino group, an alkyl group, an aryl group, and -Y-R １ and is selected from the group consisting of, preferably, R is -Y-R １ group, where - Y is selected from the group consisting of 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 fully deprotonated carboxyl group; c) Providing a polymer binder; d) Providing a substrate layer comprising one or more individual substrate layers, or a food package comprising the substrate layer; e) Mixing the oxygen scavenger of step (b), the granular filler of step (a), and the polymer binder of step (c) in the order described herein 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 component; (h) providing an alkaline component comprising a base having a pK value of 6 or lower; and optionally, ｂ ​ i) Mixing the alkali component of step (h) with water to obtain an aqueous alkali component containing 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 contains the base in an amount of 1% to 75% by weight, more preferably 5% to 60% by weight, and most preferably 10% to 35% by weight, based on the total weight of the aqueous alkaline component.

14. A method for manufacturing a sheet-like element component, comprising the following steps: a) providing a granular filler containing a mineral in an amount exceeding 50% by weight based on the total amount of the filler, preferably a granular filler containing a mineral that is an alkaline earth metal mineral, a silicate, or a mixture thereof, wherein the mineral is not surface-reacted calcium carbonate, The surface-reacted calcium carbonate is a reaction product of natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H ３ O ＋ ion donors, wherein the carbon dioxide is formed in situ by treatment with the H ３ O ＋ ion donors and / or supplied from an external source; b) providing at least one oxygen scavenger that is a compound having at least one phenyl ring with at least two phenolic hydroxyl groups and at least one R group, wherein two of the at least two phenolic hydroxyl groups are located ortho or para to each other on the at least one phenyl ring, and R is -Y-R １ is a group, where - Y is selected from the group consisting of 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 a carboxyl group that is essentially completely deprotonated; c) providing a polymer binder; d) providing a base material layer containing one or more individual base material layers, or a food package containing the base material layer; e) mixing the oxygen scavenger of step (b), the granular filler of step (a), and the polymer binder of step (c) in the order described herein to obtain a coating composition; f) applying the coating composition of step (e) onto the base material 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 component; wherein the step (b) of providing the at least one oxygen scavenger includes the following sub-steps: Providing at least one oxygen scavenger precursor which is a compound having at least one phenyl ring having at least two phenolic hydroxyl groups and at least one R group, wherein two of the at least two phenolic hydroxyl groups are in the ortho or para position to each other and are located on the at least one phenyl ring, and R is a -Y-R １ group, wherein - Y is selected from the group consisting of 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 a carboxyl group, b2) providing a basic compound, and Obtaining the oxygen scavenger by reacting the carboxyl group of the oxygen scavenger precursor in step (b3) with the basic compound in step (b2).

15. The basic compound in step (b2) is selected from the group consisting of carbonate bases, hydroxide bases, bicarbonate bases, amine bases, and mixtures thereof, 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, most preferably calcium carbonate. The method according to claim 14.

16. A method for activating a sheet element of the kit according to any one of claims 1 to 11, comprising the following steps: (j) Mixing the alkaline component with water to obtain an aqueous alkaline component containing the base and water; and (k) Applying the aqueous alkaline component to at least a part of the surface of the coating layer, where preferably, - Based on the molar amount of the oxygen scavenger, the alkaline component is added in an amount of at least 0.01 molar equivalent, preferably at least 0.02 molar equivalent, more preferably at least 0.05 molar equivalent, and even more preferably at least 0.1 molar equivalent of the base, and / or - Based on the total weight of the coating layer, the alkaline component is added in an amount of 10 to 70% by weight, preferably 20 to 65% by weight, more preferably 35 to 60% by weight, and / or - The application step (k) is carried out by inkjet printing, spraying, coating, and / or dipping.

17. The kit according to any one of claims 1 to 11, further comprising: - A supply device containing the sheet element component, preferably a supply device containing a roll or a magazine, or - A food package containing the sheet element component, where the coating layer is present inside the food package, the food package, where preferably, the sheet element component further comprises: - One or more oxygen-permeable coating layers for coating the coating layer, preferably one or more oxygen-permeable coating layers selected from the group consisting of an oxygen-permeable film layer, a fiber material layer, and a non-woven fiber layer, and / or - One or more protective layers for temporarily sealing the coating layer and / or the adhesive layer, preferably one or more protective layers selected from polyethylene, polypropylene, and / or coated paper.

18. A supply device comprising the activated sheet-like element according to claim 12, wherein the supply device protects the activated sheet-like element from oxygen and preferably comprises a roll, a stack, a magazine, or a package, such as a box, etc. Supply device.

19. A food package comprising the activated sheet-like element according to claim 12, wherein the coating layer is present within the food package.

20. The food package contains food or foodstuffs, the food is selected from the group consisting of 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, fruits, instant foods and beverages, especially orange juice.

21. Use of the kit according to any one of claims 1 to 11 or the activated sheet-like element according to claim 12 in a food package, preferably for extending the shelf life of food.

22. A packaged food comprising food and a food package having the activated sheet-like element according to claim 12, wherein the coating layer of the activated sheet-like element is present within the food package.

23. The food is selected from the group consisting of 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, fruits, instant foods and beverages, especially orange juice.

Images