POROUS COATINGS COMPRISING MINERALS AND AN OXYGEN SCAVENGER FOR IMPROVING FOOD SHELF LIFE

Abstract

The present invention relates to a kit for improving food shelf life comprising a sheet-like element component and an alkaline component. The sheet-like element component comprises a particulate filler comprising a mineral a binder and an oxygen scavenger. The oxygen scavenger is a compound comprising at least two phenolic hydroxyl groups, which can be deprotonated by the alkaline component, thus activating the oxygen scavenger. Further aspects of the present invention relate to an activated sheet-like element formed from the inventive kit, a process for the manufacture of a kit for improving shelf life, a process for the manufacture of a sheet-like element component, a process for activating the sheet-like element component, a supply device comprising the activated sheet-like element, a food packaging comprising the activated sheet-like element and the use of the kit or the activated sheet-like element in a food packaging and for prolonging food shelf life.

Claims

1. A kit for improving food shelf life, comprising a) a sheet-like element component having a1) a coating layer comprising i) a particulate filler in an amount from 25 to 70 wt.-%, based on the total dry weight of the coating layer, wherein the particulate filler comprises more than 50 wt.-%, based on the total amount of filler, of a mineral preferably being an alkaline earth metal mineral, a silicate or a mixture thereof, wherein the mineral is not a surface-reacted calcium carbonate, wherein 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.sub.3O.sup.+ ion donors, wherein the carbon dioxide is formed in situ by the H.sub.3O.sup.+ ion donors treatment and/or is supplied from an external source, ii) a polymeric binder in an amount from 5 to 25 wt.-%, based on the total dry weight of the coating layer, and iii) at least one oxygen scavenger in an amount from 25 to 70 wt.-%, 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 bearing at least two phenolic hydroxyl groups and at least one group R, wherein two of the at least two phenolic hydroxyl groups are arranged on the at least one phenyl ring in an ortho or para fashion relative to each other, and wherein R is selected from the group consisting of a hydrogen atom, a hydroxyl group, an alkoxy group, an aryloxy group, an amino group, an alkyl group, an aryl group and a YR.sup.1 group, preferably wherein R is a YR.sup.1 group, wherein Y is selected from the group consisting of a direct bond, a linear or branched alkylene group having from 1 to 6 carbon atoms, and a CHCH group, preferably Y is a direct bond, and R.sup.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 comprising a base having a pK.sub.b value of 6 or lower.

2. The kit of claim 1, wherein the sheet-like element component comprises a coating layer having a total intruded specific pore volume in the range from 0.1 to 1.5 cm.sup.3/g, as measured by mercury intrusion porosimetry, and/or having a total intra particle intruded specific pore volume in the range from 0.05 to 1.0 cm.sup.3/g, as measured by mercury intrusion porosimetry, and/or having a total inter particle intruded specific pore volume in the range from 0.05 to 0.5 cm.sup.3/g, as measured by mercury intrusion porosimetry, and/or having a total occlusion intruded specific pore volume in the range from 0.05 to 0.4 cm.sup.3/g, as measured by mercury intrusion porosimetry, and/or being present on the substrate layer in an amount from 1 to 200 g/m.sup.2.

3. The kit of claim 1, wherein particulate filler comprises at least 70 wt.-%, based on the total weight of the particulate filler.

4. The kit of claim 1, wherein the mineral is not a calcium carbonate other than ground natural calcium carbonate and precipitated calcium carbonate.

5. The kit of claim 1, wherein the mineral is an alkaline earth metal mineral.

6. The kit of claim 1, wherein the mineral is selected from the group consisting of alumosilicates, alkaline earth metal-containing silicates, and mixtures thereof.

7. The kit of claim 1, wherein the mineral has a specific surface area in the range from 20 to 200 m.sup.2/g, as measured by the BET method according to ISO 9277:2010, and/or a total intra particle intruded specific pore volume in the range from 0.1 to 2.5 cm.sup.3/g, as measured by mercury intrusion porosimetry, and/or a total intruded specific pore volume in the range from 0.1 to 6 cm.sup.3/g, as measured by mercury intrusion porosimetry.

8. The kit of claim 1, wherein the at least one oxygen scavenger is selected from the group consisting of phenolic acids bearing at least two phenolic hydroxyl groups arranged ortho or para relative to each other, cinnamic acids bearing at least two phenolic hydroxyl groups arranged ortho or para relative to each other, derivatives thereof and mixtures of the foregoing, wherein the acid derivatives are selected from the group consisting of alkyl esters, aryl esters and essentially fully deprotonated acids of the respective acid, and/or the at least one oxygen scavenger comprising an essentially fully deprotonated carboxyl group comprises a cation selected from the group consisting of ammonium, sodium, lithium, potassium, cesium, magnesium, calcium and mixtures thereof.

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

10. The kit of claim 1, wherein the alkaline component is an aqueous alkaline component comprising the base and water, wherein the pH of the aqueous alkaline component is at least 8, and/or the aqueous alkaline component comprises the base in an amount from 1 wt.-% to 75 wt.-%, based on the total weight of the aqueous alkaline component.

11. The kit of claim 1, wherein the sheet-like element component further comprises one or more oxygen-permeable covering layers to cover the coating layer, and/or one or more protective layers to temporarily seal the coating layer, and/or the adhesive layer.

12. (canceled)

13. A process for the manufacture of a kit for improving food shelf life, the process comprising the steps of: a) providing a particulate filler comprising more than 50 wt.-%, based on the total amount of filler, of a mineral preferably being an alkaline earth metal mineral, a silicate or a mixture thereof, wherein the mineral is not a surface-reacted calcium carbonate, wherein 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 the H3O+ ion donors treatment and/or is supplied from an external source, b) providing at least one oxygen scavenger being a compound having at least one phenyl ring bearing at least two phenolic hydroxyl groups and at least one group R, wherein two of the at least two phenolic hydroxyl groups are positioned on the at least one phenyl ring in an ortho or para fashion relative to each other, and wherein R is selected from the group consisting of a hydrogen atom, a hydroxyl group, an alkoxy group, an aryloxy group, an amino group, an alkyl group, an aryl group and a YR.sup.1 group, preferably wherein R is a YR.sup.1 group, wherein Y is selected from the group consisting of a direct bond, a linear or branched alkylene group having from 1 to 6 carbon atoms, and a CHCH group, preferably Y is a direct bond, and R.sup.1 is an alkoxycarbonyl group, an aryloxycarboxyl group, a carboxyl group or an essentially fully deprotonated carboxyl group, c) providing a polymeric binder, d) providing a substrate layer comprising one or more individual substrate layers or a food packaging comprising the substrate layer, e) mixing, in the order set out herein, the oxygen scavenger of step b), the particulate filler of step a) and the polymeric binder of step c) 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.sub.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 from 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.

14. A process for the manufacture of a sheet-like element component, the process comprising the steps of: a) providing a particulate filler comprising more than 50 wt.-%, based on the total amount of filler, of a mineral preferably being an alkaline earth metal mineral, a silicate or a mixture thereof, wherein the mineral is not a surface-reacted calcium carbonate, wherein 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.sub.3O.sup.+ ion donors, wherein the carbon dioxide is formed in situ by the H.sub.3O.sup.+ ion donors treatment and/or is supplied from an external source, b) providing at least one oxygen scavenger being a compound having at least one phenyl ring bearing at least two phenolic hydroxyl groups and at least one group R, wherein two of the at least two phenolic hydroxyl groups are positioned on the at least one phenyl ring in an ortho or para fashion relative to each other, and wherein R is a YR.sup.1 group, wherein Y is selected from the group consisting of a direct bond, a linear or branched alkylene group having from 1 to 6 carbon atoms, and a CHCH group, preferably Y is a direct bond, and R.sup.1 is an essentially fully deprotonated carboxyl group c) providing a polymeric binder, d) providing a substrate layer comprising one or more individual substrate layers or a food packaging comprising the substrate layer, e) mixing, in the order set out herein, the oxygen scavenger of step b), the particulate filler of step a), and the polymeric binder of step c) 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 step b) of providing the at least one oxygen scavenger comprises the sub-steps of b1) providing at least one oxygen scavenger precursor being a compound having at least one phenyl ring bearing at least two phenolic hydroxyl groups and at least one group R, wherein two of the at least two phenolic hydroxyl groups are positioned on the at least one phenyl ring in an ortho or para fashion relative to each other, and wherein R is a YR.sup.1 group, wherein Y is selected from the group consisting of a direct bond, a linear or branched alkylene group having from 1 to 6 carbon atoms, and a CHCH group, preferably Y is a direct bond, and R.sup.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.

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

16. (canceled)

17. The kit of claim 1, further comprising a supply device comprising the sheet-like element component, wherein the supply device comprises a roll or a magazine, or a food packaging comprising the sheet-like element component, wherein the coating layer is present within the food packaging.

18.-23. (canceled)

24. The kit of claim 1, wherein the mineral is selected from the group consisting of precipitated hydromagnesite, ground natural calcium carbonate and precipitated calcium carbonate.

25. The kit of claim 1, wherein the at least one oxygen scavenger is a gallic acid derivative, wherein the acid derivatives are selected from the group consisting of alkyl esters, aryl esters and essentially fully deprotonated acids of the respective acid and/or wherein the at least one oxygen scavenger is fully deprotonated and comprises a calcium cation.

26. The process of claim 14, wherein the basic compound of step b2) is calcium carbonate.

27. The kit of claim 1, wherein the sheet-like element component further comprises one or more oxygen-permeable covering layers to cover the coating layer selected from the group consisting of oxygen-permeable film layers, fibrous material layers and nonwoven fabric layers, and/or one or more protective layers to temporarily seal the coating layer, and/or the adhesive

28. The kit of claim 1 for use in food packaging.

Description

EXAMPLES

Materials and Methods

[0533] Gallic acid was purchased from Acros Organics as monohydrate. Acronal 500D was purchased from BASF.

[0534] Untreated calcium carbonate 1: marble from Italy; d.sub.50(vol)=1.83 m, d.sub.98(vol)=7 m (Malvern 3000; dry).

[0535] Dispersant: A 100% sodium neutralised polyacrylate dispersing agent with a molecular weight MW of about 4500 g/mol and a polydispersity index IP of 1.6 (2 g, 42% solid content).

[0536] Binder: Acronal 500D: Polyacrylate binder (15 g, 46 wt.-% solid content).

Coating Formulation Preparation

[0537] 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 min. The dispersant (2 g) was added and the mineral (50 g) was step by step dispersed into the formulation. The pH of the binder (15 g) was adjusted to pH 8.5 and was added into the previous formulation. The coating formulation was stirred for 15 more minutes until use. Typically, the coating formulation is characterized by a solids content of 40%, pH 6.2, viscosity of 170 mPas (100 RPM).

Preparation of the Sheet-Like Element Precursor

[0538] PET folio (Hostaphan RN 100, 100 microns, PutzFolien) was coated with a Durrer coating machine (see FIG. 2). To apply the coating formulation, the following parameters were used: Rod C50, rod pressure (1 bar), IR and Air dryer (set to 150 C.) and a speed of 5 m/min. The coating was applied with 30 g/m.sup.2.

Oxygen Scavenging Activity (OSA) of the Sheet-Like Elements

[0539] A sheet-like element comprising the Gallic acid-based coating layers comprising the different minerals as outlined in Table 1 at a coating weight of 22 g/m.sup.2 was produced following the machine coating method described above and cut into rectangular pieces of 611 cm. The sheet-like elements were separately packed with a tray sealer T200 (MULTIVAC (Hnenberg, Switzerland) in empty high barrier trays (PS-EVOH-PE with peel, 0.5 mm, 204147 mm, 14 mm height, Stger & Co AG, Muri, Switzerland; volume of 350 cm.sup.3) together with an oxygen sensor spot (type PSt 6, PreSens Precision Sensing GmbH, Regensburg, Germany) under an atmosphere containing 98 vol.-% N.sub.2 and 2 vol.-% O.sub.2. A glass petri dish containing water was also added to the tray in order to provide a relative humidity of approx. 100%. The headspace volume was set to 250 cm.sup.3 by the addition of glass beads. The relative humidity was monitored by a humidity meter (testo 174H, Testo SE & Co. KGaA, Lenzkirch, Germany).

[0540] Prior to sealing, a 1 M potassium carbonate solution (130 L10 L each) was added to each sheet-like element via an E2 EUR spray tablesystem (Nordson EFD). The packed and sealed trays were stored at 21 C. and the oxygen concentration was measured non-destructively using a fibre optic Fibox 4 trace (PreSens Precision Sensing GmbH, Regensburg, Germany). Each measurement was performed in duplicate. The results were averaged and are summarized in Table 2.

TABLE-US-00001 TABLE 1 Minerals used in the sheet-like elements. total intraparticle intruded Mineral d.sub.50 d.sub.98 SSA volume d* volume # type [m] [m] [m.sup.2/g] [cm.sup.3/g] [m] [cm.sup.3/g] 1 barite 27 113 1.9 0 0.221 2 brucite 2.5 19 10 0 1.537 3 dolomite 7.9 35 65 0 0.470 4 GCC 2.3 11 2.8 0 0.748 5 PHM 9.2 33 41 1.222 0.53 4.242 6 kaolin 2.4 14 17 0 1.787 7 PCC 4.7 21 35 0.408 0.16 1.619 8 perlite 3.1 9.3 2.4 0 0.811 9 talcum 21 66 4.4 0 1.125 10 silica 23 52 >400 0 1.248 11 zeolite 4.1 37 >400 0 0.918 GCCground calcium carbonate, PHMprecipitated hydromagnesite, PCCprecipitated calcium carbonate, SSAspecific surface area.

[0541] The sheet-like elements were subjected to an oxygen scavenging activity test as described in Example 1. The results are summarized in Table 2.

TABLE-US-00002 TABLE 2 Oxygen Scavenging Activity of sheet-like elements comprising different minerals. Oxygen content Time to reduce O.sub.2 concentration # Mineral after 1 d [%] to below 0.01% [h] 1 barite 0.094 21.42 2 brucite 1.096 >191.sup.a 3 dolomite 0.077 39.54 4 GCC 0.091 43.46 5 PHM 0.003 10.59 6 kaolin 0.712 >191.sup.b 7 PCC 0.143 46.33 8 perlite 0.628 240.00 9 talcum 0.107 41.83 10 silica 1.323 >160.sup.c 11 zeolite 0.612 >111.sup.d .sup.aoxygen content after 8 days = 0.12%, .sup.boxygen content after 8 days = 0.05%, .sup.coxygen content after 6.7 days = 0.37%, .sup.doxygen content after 4.6 days = 0.12%.

[0542] Further aspects and embodiments of the invention are described in the following:

Aspect or Embodiment 1: A kit for improving food shelf life, comprising [0543] a) a sheet-like element component having [0544] a1) a coating layer comprising [0545] i) a particulate filler in an amount from 25 to 70 wt.-%, based on the total dry weight of the coating layer, [0546] wherein the particulate filler comprises more than 50 wt.-%, based on the total amount of filler, of a mineral preferably being an alkaline earth metal mineral, a silicate or a mixture thereof, wherein the mineral is not a surface-reacted calcium carbonate, [0547] wherein 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.sub.3O.sup.+ ion donors, wherein the carbon dioxide is formed in situ by the H.sub.3O.sup.+ ion donors treatment and/or is supplied from an external source, [0548] ii) a polymeric binder in an amount from 5 to 25 wt.-%, based on the total dry weight of the coating layer, and [0549] iii) at least one oxygen scavenger in an amount from 25 to 70 wt.-%, based on the total dry weight of the coating layer, [0550] wherein the at least one oxygen scavenger is a compound having at least one phenyl ring bearing at least two phenolic hydroxyl groups and at least one group R, [0551] wherein two of the at least two phenolic hydroxyl groups are arranged on the at least one phenyl ring in an ortho or para fashion relative to each other, and [0552] wherein R is selected from the group consisting of a hydrogen atom, a hydroxyl group, an alkoxy group, an aryloxy group, an amino group, an alkyl group, an aryl group and a YR.sup.1 group, preferably wherein R is a YR.sup.1 group, wherein Y is selected from the group consisting of a direct bond, a linear or branched alkylene group having from 1 to 6 carbon atoms, and a CHCH group, preferably Y is a direct bond, and R.sup.1 is an alkoxycarbonyl group, an aryloxycarboxyl group or an essentially fully deprotonated carboxyl group, and [0553] a2) a substrate layer, and [0554] b) an alkaline component comprising a base having a pK.sub.b value of 6 or lower.
2. The kit of embodiment 1, wherein the sheet-like element component comprises a coating layer [0555] having a total intruded specific pore volume in the range from 0.1 to 1.5 cm.sup.3/g, preferably from 0.1 to 1.0 cm.sup.3/g, as measured by mercury intrusion porosimetry, and/or [0556] having a total intra particle intruded specific pore volume in the range from 0.05 to 1.0 cm.sup.3/g, preferably from 0.08 to 0.5 cm.sup.3/g, and more preferably from 0.1 to 0.4 cm.sup.3/g, as measured by mercury intrusion porosimetry, and/or [0557] having a total inter particle intruded specific pore volume in the range from 0.05 to 0.5 cm.sup.3/g, preferably from 0.08 to 0.4 cm.sup.3/g, and more preferably from 0.1 to 0.3 cm.sup.3/g, as measured by mercury intrusion porosimetry, and/or [0558] having a total occlusion intruded specific pore volume in the range from 0.05 to 0.4 cm.sup.3/g, preferably from 0.08 to 0.3 cm.sup.3/g, and more preferably from 0.1 to 0.2 cm.sup.3/g, as measured by mercury intrusion porosimetry, and/or [0559] being present on the substrate layer in an amount from 1 to 200 g/m.sup.2, preferably 2 to 150 g/m.sup.2, more preferably 10 to 120 g/m.sup.2.
3. The kit of any of the preceding embodiments, wherein the coating layer comprises [0560] the polymeric binder in an amount from 10 to 20 wt.-%, based on the total dry weight of the coating layer, and/or [0561] the particulate filler in an amount from 30 to 60 wt.-%, based on the total dry weight of the coating layer, and/or [0562] the oxygen scavenger in an amount from 30 to 60 wt.-%, based on the total dry weight of the coating layer.
4. The kit of any of the preceding embodiments, wherein the mineral is not a calcium carbonate other than ground natural calcium carbonate and precipitated calcium carbonate, preferably the mineral is not a calcium carbonate other than ground natural calcium carbonate.
5. The kit of any of the preceding embodiments, wherein particulate filler comprises at least 70 wt.-%, preferably at least 90 wt.-%, based on the total weight of the particulate filler, and most preferably consists of the mineral.
6. The kit of any of the preceding embodiments, wherein the mineral is an alkaline earth metal mineral, preferably selected from the group consisting of alkaline earth metal carbonates, alkaline earth metal phosphates, alkaline earth metal sulphates, alkaline earth metal oxides, alkaline earth metal hydroxides and mixtures thereof, [0563] more preferably the alkaline earth metal mineral is selected from the group consisting of calcium and/or magnesium carbonates, phosphates, sulphates, oxides, hydroxides and mixtures thereof, [0564] even more preferably the alkaline earth metal mineral is selected from the group consisting of calcium carbonate, magnesium carbonate and mixtures thereof, and [0565] most preferably the alkaline earth metal mineral is selected from the group consisting of precipitated hydromagnesite, ground natural calcium carbonate and precipitated calcium carbonate.
7. The kit of any of the preceding embodiments, wherein the mineral is a silicate, preferably selected from the group consisting of alumosilicates, alkaline earth metal-containing silicates, and mixtures thereof, and more preferably is selected from the group consisting of zeolites, perlite, kaolin, bentonite, calcined clay, and mixtures thereof.
8. The kit of any of the preceding embodiments, wherein the mineral has [0566] a specific surface area in the range from 20 to 200 m.sup.2/g, preferably in the range from 50 to 120 m.sup.2/g, as measured by the BET method according to ISO 9277:2010, and/or [0567] a total intra particle intruded specific pore volume in the range from 0.1 to 2.5 cm.sup.3/g, preferably from 0.2 to 2.2 cm.sup.3/g, more preferably from 0.4 to 2.0 cm.sup.3/g and most preferably from 0.6 to 1.8 cm.sup.3/g, as measured by mercury intrusion porosimetry, and/or [0568] a total intruded specific pore volume in the range from 0.1 to 6 cm.sup.3/g, preferably from 1 to 5 cm.sup.3/g, more preferably from 2 to 5 cm.sup.3/g and most preferably from 2.5 to 5 cm.sup.3/g, as measured by mercury intrusion porosimetry.
9. The kit of any of the preceding embodiments, wherein the particulate filler comprises as the mineral a precipitated hydromagnesite in an amount of more than 50 wt.-%, based on the total amount of the particulate filler, preferably [0569] wherein the particulate filler comprises the precipitated hydromagnesite in an amount of at least 70 wt.-%, preferably at least 90 wt.-%, based on the total weight of the particulate filler, and most preferably the particulate filler consists of the precipitated hydromagnesite, and [0570] wherein any optionally present further particulate filler material is selected from the group consisting of dolomite, ground calcium carbonate, precipitated calcium carbonate, magnesium hydroxide, talc, gypsum, titanium dioxide, kaolin, silicate, mica, barium sulphate, calcined clay, non-calcined (hydrous) clay, bentonite and mixtures thereof, and preferably is selected from the group consisting of ground calcium carbonate, precipitated calcium carbonate and mixtures thereof, and most preferably wherein the particulate filler consists of the optionally present further particulate filler material and the precipitated hydromagnesite.
10. The kit of embodiment 9, wherein the precipitated hydromagnesite [0571] has a specific surface area in the range from 20 to 200 m.sup.2/g, preferably 50 to 120 m.sup.2/g, as measured by the BET method according to ISO 9277:2010, and/or [0572] has a total intra particle intruded specific pore volume in the range from 0.1 to 2.5 cm.sup.3/g, preferably from 0.2 to 2.2 cm.sup.3/g, more preferably from 0.4 to 2.0 cm.sup.3/g and most preferably from 0.6 to 1.8 cm.sup.3/g, as measured by mercury intrusion porosimetry.
11. The kit of any of the preceding embodiments, wherein [0573] the at least one oxygen scavenger is selected from the group consisting of phenolic acids bearing at least two phenolic hydroxyl groups arranged ortho or para relative to each other, cinnamic acids bearing at least two phenolic hydroxyl groups arranged ortho or para relative to each other, derivatives thereof and mixtures of the foregoing, [0574] preferably wherein the at least one oxygen scavenger is selected from the group consisting of gallic acids, digallic acids, protocatechuic acids, caffeic acids, 5-hydroxyferulic acids, gentisic acids, orsellinic acids, chebulic acids, phloroglucinol carboxylic acids, chicoric acids, derivatives thereof, and mixtures of the foregoing, even more preferably the at least one oxygen scavenger is a gallic acid derivative, [0575] wherein the acid derivatives are selected from the group consisting of alkyl esters, aryl esters and essentially fully deprotonated acids of the respective acid, [0576] and most preferably the at least one oxygen scavenger is an essentially fully deprotonated gallic acid, and/or [0577] the at least one oxygen scavenger comprising an essentially fully deprotonated carboxyl group comprises a cation selected from the group consisting of ammonium, sodium, lithium, potassium, cesium, magnesium, calcium and mixtures thereof, preferably wherein the at least one oxygen scavenger comprises a cation selected from the group consisting of sodium, potassium, calcium, magnesium and mixtures thereof and most preferably wherein the at least one oxygen scavenger comprises a calcium cation.
12. The kit of any of the preceding embodiments, wherein the polymeric binder is selected from the group consisting of polyacrylic acid, salts thereof, derivatives thereof, starch, proteins, styrene butadiene latices, polyvinyl alcohol, polyvinyl acetate and mixtures thereof, preferably wherein the polymeric binder is selected from polyacrylic acid, salts thereof, derivatives thereof and mixtures thereof.
13. The kit of any of the preceding embodiments, wherein the substrate layer comprises one or more individual substrate layers selected from the group consisting of polymer material layers, preferably made from polyethylene, polypropylene, polyethylene terephthalate, polylactic acid, polyhydroxybutyrate, polyethylene-2,5-furandicarboxylate, polystyrene or mixtures thereof, fibrous material layers, preferably made from cellulose acetate, viscose, polypropylene, polyethylene terephthalate, polylactic acid, or mixtures thereof, paper layers, cardboard layers, textile layers, nonwoven layers, layers made from bio-based materials, wood layers, bamboo layers, metal foil layers, aluminum layers, print receptive coating layers, and mixtures of the foregoing, wherein the one or more individual substrate layers optionally have been subjected to a corona treatment, and wherein preferably the one or more individual substrate layers is selected from polymer material layers.
14. The kit of any of the preceding embodiments, wherein the sheet-like element component further comprises [0578] one or more adhesive layers, being located on the substrate layer on the opposite side of the coating layer and/or between the individual substrate layers, wherein the adhesive layer preferably is selected from the group consisting of adhesives, sealants, rubber coatings, pressure-sensitive layers and mixtures of the foregoing; and/or [0579] one or more primer layers, being located between the substrate layer and the coating layer, and/or [0580] one or more oxygen-permeable covering layers to cover the coating layer, preferably selected from the group consisting of oxygen-permeable film layers, fibrous material layers and nonwoven fabric layers, and/or [0581] one or more protective layers to temporarily seal the coating layer, and/or the adhesive layer, preferably selected from polyethylene, polypropylene and/or coated paper, [0582] preferably wherein the sheet-like element component further comprises [0583] one or more oxygen-permeable covering layers to cover the coating layer, preferably selected from the group consisting of oxygen-permeable film layers, fibrous material layers and nonwoven fabric layers, and/or [0584] one or more protective layers to temporarily seal the coating layer, and/or the adhesive layer, preferably selected from polyethylene, polypropylene and/or coated paper.
15. The kit of any of the preceding embodiments, wherein the alkaline component comprises a base selected from the group consisting of hydroxide bases, carbonate bases, ammonia bases and mixtures thereof, preferably is selected from the group consisting of lithium hydroxide, sodium hydroxide, potassium hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, caesium carbonate and mixtures thereof, and most preferably is selected from the group consisting of sodium hydroxide, potassium carbonate and sodium carbonate.
16. The kit of any of the preceding embodiments, wherein the alkaline component is an aqueous alkaline component comprising the base and water, wherein preferably [0585] 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 [0586] the aqueous alkaline component comprises the base in an amount from 1 wt.-% to 75 wt.-%, more preferably 5 wt.-% to 60 wt.-%, and most preferably from 10 to 35 wt.-%, based on the total weight of the aqueous alkaline component.
Aspect or Embodiment 17. An activated sheet-like element formed from the kit of any of the preceding embodiments by adding to the coating layer of the sheet-like element component the alkaline component, wherein the activated sheet-like element comprises reaction products of the at least one oxygen scavenger with the base, wherein preferably [0587] the alkaline component is added in an amount such that the base is added in an amount of at least 0.01 molar equivalents, preferably at least 0.02 molar equivalents, more preferably at least 0.05 molar equivalents and even more preferably at least 0.1 molar equivalents, based on the molar amount of the oxygen scavenger, and/or [0588] the alkaline component is added in an amount from 10 to 70 wt.-%, preferably 20 to 65 wt.-% and more preferably from 35 to 60 wt.-%, based on the total weight of the coating layer.
18. The activated sheet-like element according to embodiment 17, wherein the alkaline component comprises a base selected from the group consisting of hydroxide bases, carbonate bases, ammonia bases and mixtures thereof, preferably is selected from the group consisting of lithium hydroxide, sodium hydroxide, potassium hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, caesium carbonate and mixtures thereof, and most preferably is selected from the group consisting of sodium hydroxide, potassium carbonate and sodium carbonate.
19. The activated sheet-like element according to embodiment 17 or 18, further comprising [0589] one or more oxygen-permeable covering layers to cover the coating layer, preferably selected from the group consisting of oxygen-permeable film layers, fibrous material layers and nonwoven fabric layers, and/or [0590] one or more protective layers to temporarily seal the coating layer, and/or the adhesive layer, preferably selected from polyethylene, polypropylene and/or coated paper.
Aspect or embodiment 20: A process for the manufacture of a kit for improving food shelf life, the process comprising the steps of: [0591] a) providing a particulate filler comprising more than 50 wt.-%, based on the total amount of filler, of a mineral preferably being an alkaline earth metal mineral, a silicate or a mixture thereof, [0592] wherein the mineral is not a surface-reacted calcium carbonate, [0593] wherein 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.sub.3O.sup.+ ion donors, wherein the carbon dioxide is formed in situ by the H.sub.3O.sup.+ ion donors treatment and/or is supplied from an external source, [0594] b) providing at least one oxygen scavenger being a compound having at least one phenyl ring bearing at least two phenolic hydroxyl groups and at least one group R, wherein two of the at least two phenolic hydroxyl groups are positioned on the at least one phenyl ring in an ortho or para fashion relative to each other, and wherein R is selected from the group consisting of a hydrogen atom, a hydroxyl group, an alkoxy group, an aryloxy group, an amino group, an alkyl group, an aryl group and a YR.sup.1 group, preferably wherein R is a YR.sup.1 group, wherein [0595] Y is selected from the group consisting of a direct bond, a linear or branched alkylene group having from 1 to 6 carbon atoms, and a CHCH group, preferably Y is a direct bond, and [0596] R.sup.1 is an alkoxycarbonyl group, an aryloxycarboxyl group, a carboxyl group or an essentially fully deprotonated carboxyl group, [0597] c) providing a polymeric binder, [0598] d) providing a substrate layer comprising one or more individual substrate layers or a food packaging comprising the substrate layer, [0599] e) mixing, in the order set out herein, the oxygen scavenger of step b), the particulate filler of step a) and the polymeric binder of step c) to obtain a coating composition, [0600] f) applying the coating composition of step e) onto the substrate layer of step d) to obtain a sheet-like element precursor, [0601] g) drying the sheet-like element precursor obtained in step f) to obtain a sheet-like element component, [0602] h) providing an alkaline component comprising a base having a pK.sub.b value of 6 or lower, and optionally [0603] i) mixing the alkaline component of step h) with water to obtain an aqueous alkaline component comprising the base and water, wherein preferably [0604] 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 [0605] the aqueous alkaline component comprises the base in an amount from 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.
Aspect or embodiment 21: A process for the manufacture of a sheet-like element component, the process comprising the steps of: [0606] a) providing a particulate filler comprising more than 50 wt.-%, based on the total amount of filler, of a mineral preferably being an alkaline earth metal mineral, a silicate or a mixture thereof, [0607] wherein the mineral is not a surface-reacted calcium carbonate, [0608] wherein 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.sub.3O.sup.+ ion donors, wherein the carbon dioxide is formed in situ by the H.sub.3O.sup.+ ion donors treatment and/or is supplied from an external source, [0609] b) providing at least one oxygen scavenger being a compound having at least one phenyl ring bearing at least two phenolic hydroxyl groups and at least one group R, wherein two of the at least two phenolic hydroxyl groups are positioned on the at least one phenyl ring in an ortho or para fashion relative to each other, and wherein R is a YR.sup.1 group, wherein [0610] Y is selected from the group consisting of a direct bond, a linear or branched alkylene group having from 1 to 6 carbon atoms, and a CHCH group, preferably Y is a direct bond, and [0611] R.sup.1 is an essentially fully deprotonated carboxyl group [0612] c) providing a polymeric binder, [0613] d) providing a substrate layer comprising one or more individual substrate layers or a food packaging comprising the substrate layer, [0614] e) mixing, in the order set out herein, the oxygen scavenger of step b), the particulate filler of step a), and the polymeric binder of step c) to obtain a coating composition, [0615] f) applying the coating composition of step e) onto the substrate layer of step d) to obtain a sheet-like element precursor, and [0616] g) drying the sheet-like element precursor obtained in step f) to obtain a sheet-like element component, [0617] wherein step b) of providing the at least one oxygen scavenger comprises the sub-steps of [0618] b1) providing at least one oxygen scavenger precursor being a compound having at least one phenyl ring bearing at least two phenolic hydroxyl groups and at least one group R, wherein two of the at least two phenolic hydroxyl groups are positioned on the at least one phenyl ring in an ortho or para fashion relative to each other, and wherein R is a YR.sup.1 group, wherein [0619] Y is selected from the group consisting of a direct bond, a linear or branched alkylene group having from 1 to 6 carbon atoms, and a CHCH group, preferably Y is a direct bond, and [0620] R.sup.1 is a carboxyl group, [0621] b2) providing a basic compound, and [0622] 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.
22. The process of embodiment 21, wherein the basic compound of step b2) is selected from the group consisting of carbonate bases, hydroxide bases, bicarbonate bases, amine bases and mixtures thereof, and more preferably 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 is calcium carbonate.
23. The process of any of the embodiments 20 to 22, wherein the mineral is not a calcium carbonate other than ground natural calcium carbonate and precipitated calcium carbonate, preferably the mineral is not a calcium carbonate other than ground natural calcium carbonate.
24. The process of any one of embodiments 20 to 23, wherein [0623] mixing step e) is performed in the presence of a solvent, preferably water, and/or [0624] application step f) is performed by means of roller coating, dip coating, grooved rod coating, curtain coating, stiff blade coating, applicator roll coating, fountain coating, jet coating, short dwell coating, slotted die coating, bent blade coating, bevel blade coating, air knife coating, bar coating, gravure coating, conventional or metering size press coating, spray application techniques, screen printing and/or wet stack coating, preferably roller coating, and/or [0625] drying step g) is performed at a temperature in the range from 50 to 150 C. at ambient pressure, or at reduced pressure, preferably by hot air drying, IR radiation drying or UV radiation drying.
25. The process of any one of embodiments 20 to 24, wherein the sheet-like element component comprises a coating layer [0626] having a total intruded specific pore volume in the range from 0.1 to 1.5 cm.sup.3/g, preferably from 0.1 to 1.0 cm.sup.3/g, as measured by mercury intrusion porosimetry, and/or [0627] having a total intra particle intruded specific pore volume in the range from 0.05 to 1.0 cm.sup.3/g, preferably from 0.08 to 0.5 cm.sup.3/g, and more preferably from 0.1 to 0.4 cm.sup.3/g, as measured by mercury intrusion porosimetry, and/or [0628] having a total inter particle intruded specific pore volume in the range from 0.05 to 0.5 cm.sup.3/g, preferably from 0.08 to 0.4 cm.sup.3/g, and more preferably from 0.1 to 0.3 cm.sup.3/g, as measured by mercury intrusion porosimetry, and/or [0629] having a total occlusion intruded specific pore volume in the range from 0.05 to 0.4 cm.sup.3/g, preferably from 0.08 to 0.3 cm.sup.3/g, and more preferably from 0.1 to 0.2 cm.sup.3/g, as measured by mercury intrusion porosimetry, and/or [0630] being present on the substrate layer in an amount from 1 to 200 g/m.sup.2, preferably 2 to 150 g/m.sup.2, more preferably 10 to 120 g/m.sup.2.
26. The process of any one of embodiments 20 to 25, wherein the coating layer comprises [0631] the polymeric binder in an amount from 10 to 20 wt.-%, based on the total dry weight of the coating layer, and/or [0632] the particulate filler in an amount from 30 to 60 wt.-%, based on the total dry weight of the coating layer, and/or [0633] the oxygen scavenger in an amount from 30 to 60 wt.-%, based on the total dry weight of the coating layer.
27. The process of any one of embodiments 20 to 26, wherein the particulate filler comprises the mineral in an amount of at least 70 wt.-%, preferably at least 90 wt.-%, based on the total weight of the at least one particulate filler, and most preferably the particulate filler consists of the mineral, and wherein any optionally present further particulate filler material is selected from the group consisting of dolomite, ground calcium carbonate, precipitated calcium carbonate, magnesium hydroxide, talc, gypsum, titanium dioxide, kaolin, silicate, mica, barium sulphate, calcined clay, non-calcined (hydrous) clay, bentonite and mixtures thereof, and preferably is selected from the group consisting of ground calcium carbonate, precipitated calcium carbonate and mixtures thereof, and most preferably wherein the particulate filler consists of the optionally present further particulate filler material and the mineral.
28. The process of any one of embodiments 19 to 27, wherein the mineral is an alkaline earth metal mineral, preferably selected from the group consisting of alkaline earth metal carbonates, alkaline earth metal phosphates, alkaline earth metal sulphates, alkaline earth metal oxides, alkaline earth metal hydroxides and mixtures thereof, [0634] more preferably the alkaline earth metal mineral is selected from the group consisting of calcium and/or magnesium carbonates, phosphates, sulphates, oxides, hydroxides and mixtures thereof, [0635] even more preferably the alkaline earth metal mineral is selected from the group consisting of calcium carbonate, magnesium carbonate and mixtures thereof, and [0636] most preferably the alkaline earth metal mineral is selected from the group consisting of precipitated hydromagnesite, ground natural calcium carbonate and precipitated calcium carbonate.
29. The process of any one of embodiments 20 to 29, wherein the mineral is a silicate, preferably selected from the group consisting of alumosilicates, alkaline earth metal-containing silicates, and mixtures thereof, and more preferably is selected from the group consisting of zeolites, perlite, kaolin, bentonite, calcined clay, and mixtures thereof.
30. The process of any one of embodiments 20 to 29, wherein the mineral has [0637] a specific surface area in the range from 20 to 200 m.sup.2/g, preferably in the range from 50 to 120 m.sup.2/g, as measured by the BET method according to ISO 9277:2010, and/or [0638] a total intra particle intruded specific pore volume in the range from 0.1 to 2.5 cm.sup.3/g, preferably from 0.2 to 2.2 cm.sup.3/g, more preferably from 0.4 to 2.0 cm.sup.3/g and most preferably from 0.6 to 1.8 cm.sup.3/g, as measured by mercury intrusion porosimetry, and/or [0639] a total intruded specific pore volume in the range from 0.1 to 6 cm.sup.3/g, preferably from 1 to 5 cm.sup.3/g, more preferably from 2 to 5 cm.sup.3/g and most preferably from 2.5 to 5 cm.sup.3/g, as measured by mercury intrusion porosimetry.
31. The process of any one of embodiments 20 to 30, wherein the particulate filler comprises as the mineral a precipitated hydromagnesite in an amount of more than 50 wt.-%, based on the total amount of the particulate filler, preferably [0640] wherein the particulate filler comprises the precipitated hydromagnesite in an amount of at least 70 wt.-%, preferably at least 90 wt.-%, based on the total weight of the particulate filler, and most preferably the particulate filler consists of the precipitated hydromagnesite, and [0641] wherein any optionally present further particulate filler material is selected from the group consisting of dolomite, ground calcium carbonate, precipitated calcium carbonate, magnesium hydroxide, talc, gypsum, titanium dioxide, kaolin, silicate, mica, barium sulphate, calcined clay, non-calcined (hydrous) clay, bentonite and mixtures thereof, and preferably is selected from the group consisting of ground calcium carbonate, precipitated calcium carbonate and mixtures thereof, and most preferably wherein the particulate filler consists of the optionally present further particulate filler material and the precipitated hydromagnesite.
32. The process of embodiment 31, wherein the precipitated hydromagnesite [0642] has a specific surface area in the range from 20 to 200 g/m.sup.2, preferably 50 to 120 m.sup.2/g, as measured by the BET method according to ISO 9277:2010, and/or [0643] has a total intra particle intruded specific pore volume in the range from 0.1 to 2.5 cm.sup.3/g, preferably from 0.2 to 2.2 cm.sup.3/g, more preferably from 0.4 to 2.0 cm.sup.3/g and most preferably from 0.6 to 1.8 cm.sup.3/g, as measured by mercury intrusion porosimetry.
33. The process of any one of embodiments 20 to 32, wherein [0644] the at least one oxygen scavenger is selected from the group consisting of phenolic acids bearing at least two phenolic hydroxyl groups arranged ortho or para relative to each other, cinnamic acids bearing at least two phenolic hydroxyl groups arranged ortho or para relative to each other, derivatives thereof and mixtures of the foregoing, [0645] preferably wherein the at least one oxygen scavenger is selected from the group consisting of gallic acids, digallic acids, protocatechuic acids, caffeic acids, 5-hydroxyferulic acids, gentisic acids, orsellinic acids, chebulic acids, phloroglucinol carboxylic acids, chicoric acids, derivatives thereof, and mixtures of the foregoing, even more preferably the at least one oxygen scavenger is a gallic acid derivative, [0646] wherein the acid derivatives are selected from the group consisting of alkyl esters, aryl esters and essentially fully deprotonated acids of the respective acid, [0647] and most preferably the at least one oxygen scavenger is an essentially fully deprotonated gallic acid, and/or [0648] the at least one oxygen scavenger comprising an essentially fully deprotonated carboxyl group comprises a cation selected from the group consisting of ammonium, sodium, lithium, potassium, cesium, magnesium, calcium and mixtures thereof, preferably wherein the at least one oxygen scavenger comprises a cation selected from the group consisting of sodium, potassium, calcium, magnesium and mixtures thereof and most preferably wherein the at least one oxygen scavenger comprises a calcium cation.
34. The process of any one of embodiments 20 to 33, wherein the polymeric binder is selected from the group consisting of polyacrylic acid, salts thereof, derivatives thereof, starch, proteins, styrene butadiene latices, polyvinyl alcohol, polyvinyl acetate and mixtures thereof, preferably wherein the polymeric binder is selected from polyacrylic acid, salts thereof, derivatives thereof and mixtures thereof.
35. The process of any one of embodiments 20 to 34, wherein the substrate layer comprises one or more individual substrate layers selected from the group consisting of polymer material layers, preferably made from polyethylene, polypropylene, polyethylene terephthalate, polylactic acid, polyhydroxybutyrate, polyethylene-2,5-furandicarboxylate, polystyrene or mixtures thereof, fibrous material layers, preferably made from cellulose acetate, viscose, polypropylene, polyethylene terephthalate, polylactic acid, or mixtures thereof, paper layers, cardboard layers, textile layers, nonwoven layers, layers made from bio-based materials, wood layers, bamboo layers, metal foil layers, aluminum layers, print receptive coating layers, and mixtures of the foregoing, wherein the one or more individual substrate layers optionally have been subjected to a corona treatment, and wherein preferably the one or more individual substrate layers is selected from polymer material layers.
36. The process of any one of embodiments 20 to 35, wherein the sheet-like element component further comprises [0649] one or more adhesive layers, being located on the substrate layer on the opposite side of the coating layer and/or between the individual substrate layers, wherein the adhesive layer preferably is selected from the group consisting of adhesives, sealants, rubber coatings, pressure-sensitive layers and mixtures of the foregoing; and/or [0650] one or more primer layers, being located between the substrate layer and the coating layer, and/or [0651] one or more oxygen-permeable covering layers to cover the coating layer, preferably selected from the group consisting of oxygen-permeable film layers, fibrous material layers and nonwoven fabric layers, and/or [0652] one or more protective layers to temporarily seal the coating layer, and/or the adhesive layer, preferably selected from polyethylene, polypropylene and/or coated paper, [0653] preferably wherein the sheet-like element component further comprises [0654] one or more oxygen-permeable covering layers to cover the coating layer, preferably selected from the group consisting of oxygen-permeable film layers, fibrous material layers and nonwoven fabric layers, and/or [0655] one or more protective layers to temporarily seal the coating layer, and/or the adhesive layer, preferably selected from polyethylene, polypropylene and/or coated paper.
37. The process of any one of embodiments 20 to 36, wherein the alkaline component comprises a base selected from the group consisting of hydroxide bases, carbonate bases, ammonia bases and mixtures thereof, preferably is selected from the group consisting of lithium hydroxide, sodium hydroxide, potassium hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, caesium carbonate and mixtures thereof, and most preferably is selected from the group consisting of sodium hydroxide, potassium carbonate and sodium carbonate.
38. The process of any one of embodiments 20 to 37, wherein the alkaline component is an aqueous alkaline component comprising the base and water, wherein preferably [0656] 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 [0657] the aqueous alkaline component comprises the base in an amount from 1 wt.-% to 75 wt.-%, more preferably 5 wt.-% to 60 wt.-%, and most preferably from 10 to 35 wt.-%, based on the total weight of the aqueous alkaline component.
Aspect or Embodiment 39. A process for activating the sheet-like element of the kit of any one of embodiments 1 to 16, comprising the steps of [0658] j) mixing the alkaline component with water to obtain an aqueous alkaline component comprising the base and water, and [0659] k) applying the aqueous alkaline component onto at least a part of the surface of the coating layer, wherein preferably [0660] the alkaline component is added in an amount such that the base is added in an amount of at least 0.01 molar equivalents, preferably at least 0.02 molar equivalents, more preferably at least 0.05 molar equivalents, even more preferably at least 0.1 molar equivalents, based on the molar amount of the oxygen scavenger, and/or [0661] the alkaline component is added in an amount from 10 to 70 wt.-%, preferably 20 to 65 wt.-% and more preferably from 35 to 60 wt.-%, based on the total weight of the coating layer, and/or [0662] application step k) is performed by inkjet printing, spraying, coating, and/or dripping.
40. The process of embodiment 39, wherein the alkaline component comprises a base selected from the group consisting of hydroxide bases, carbonate bases, ammonia bases and mixtures thereof, preferably is selected from the group consisting of lithium hydroxide, sodium hydroxide, potassium hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, caesium carbonate and mixtures thereof, and most preferably is selected from the group consisting of sodium hydroxide, potassium carbonate and sodium carbonate.
41. The kit of any one of embodiments 1 to 16, further comprising [0663] a supply device comprising the sheet-like element component, wherein the supply device preferably comprises a roll or a magazine, or [0664] a food packaging comprising the sheet-like element component, wherein the coating layer is present within the food packaging.
42. The kit of embodiment 41, wherein the sheet-like element component further comprises [0665] one or more oxygen-permeable covering layers to cover the coating layer, preferably selected from the group consisting of oxygen-permeable film layers, fibrous material layers and nonwoven fabric layers, and/or [0666] one or more protective layers to temporarily seal the coating layer, and/or the adhesive layer, preferably selected from polyethylene, polypropylene and/or coated paper.
43. A supply device comprising the activated sheet-like element of 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 packaging, such as a box.
Aspect or Embodiment 44. A food packaging comprising the activated sheet-like element of any one of embodiments 17 to 19, wherein the coating layer is present within the food packaging.
Aspect or Embodiment 45. Use of a kit according to any one of embodiments 1 to 16 or an activated sheet-like element according to any one of embodiments 17 to 19 in a food packaging.
Aspect or Embodiment 46. Use of a kit according to any one of embodiments 1 to 16 or an activated sheet-like element according to any one of embodiments 17 to 19 for prolonging food shelf life.
Aspect or Embodiment 47. A packaged food comprising a food and a food packaging having an activated sheet-like element of any one of embodiments 17 to 19, wherein the coating layer of the activated sheet-like element is present within the food packaging.
Aspect or Embodiment 48. A packaged food according to embodiment 47, wherein the food is selected from the group consisting of liquid and solid food, preferably is an oxygen sensitive food, including raw and processed meat, poultry, beef, pork, ham, sausage, dried meat, raw and processed fish, dairy products, bakery products, snacks, nuts and oil seeds, vegetables; sweets, ready-to-eat foods and beverages, especially orange juice.