WO2022269249A1 - Additive composition - Google Patents

Additive composition Download PDF

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Publication number
WO2022269249A1
WO2022269249A1 PCT/GB2022/051580 GB2022051580W WO2022269249A1 WO 2022269249 A1 WO2022269249 A1 WO 2022269249A1 GB 2022051580 W GB2022051580 W GB 2022051580W WO 2022269249 A1 WO2022269249 A1 WO 2022269249A1
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WO
WIPO (PCT)
Prior art keywords
additive composition
composition according
antimicrobial substance
oxygen scavenger
food preservative
Prior art date
Application number
PCT/GB2022/051580
Other languages
French (fr)
Inventor
Radu Baciu
Original Assignee
Symphony Environmental Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Symphony Environmental Ltd. filed Critical Symphony Environmental Ltd.
Publication of WO2022269249A1 publication Critical patent/WO2022269249A1/en

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K9/00—Use of pretreated ingredients
    • C08K9/12—Adsorbed ingredients, e.g. ingredients on carriers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
    • C08K5/005—Stabilisers against oxidation, heat, light, ozone
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
    • A01N25/08—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests containing solids as carriers or diluents
    • A01N25/10—Macromolecular compounds
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N31/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic oxygen or sulfur compounds
    • A01N31/08—Oxygen or sulfur directly attached to an aromatic ring system
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N43/00—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds
    • A01N43/02—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with one or more oxygen or sulfur atoms as the only ring hetero atoms
    • A01N43/04—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with one or more oxygen or sulfur atoms as the only ring hetero atoms with one hetero atom
    • A01N43/06—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with one or more oxygen or sulfur atoms as the only ring hetero atoms with one hetero atom five-membered rings
    • A01N43/08—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with one or more oxygen or sulfur atoms as the only ring hetero atoms with one hetero atom five-membered rings with oxygen as the ring hetero atom
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N43/00—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds
    • A01N43/34—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with one nitrogen atom as the only ring hetero atom
    • A01N43/40—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with one nitrogen atom as the only ring hetero atom six-membered rings
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
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    • A01N43/00—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds
    • A01N43/72—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with nitrogen atoms and oxygen or sulfur atoms as ring hetero atoms
    • A01N43/80—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with nitrogen atoms and oxygen or sulfur atoms as ring hetero atoms five-membered rings with one nitrogen atom and either one oxygen atom or one sulfur atom in positions 1,2
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
    • A01N59/16—Heavy metals; Compounds thereof
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
    • A01N59/16—Heavy metals; Compounds thereof
    • A01N59/20—Copper
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01P—BIOCIDAL, PEST REPELLANT, PEST ATTRACTANT OR PLANT GROWTH REGULATORY ACTIVITY OF CHEMICAL COMPOUNDS OR PREPARATIONS
    • A01P1/00—Disinfectants; Antimicrobial compounds or mixtures thereof
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23B—PRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
    • A23B7/00—Preservation or chemical ripening of fruit or vegetables
    • A23B7/14—Preserving or ripening with chemicals not covered by groups A23B7/08 or A23B7/10
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
    • A23L3/34—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with chemicals
    • A23L3/3409—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with chemicals in the form of gases, e.g. fumigation; Compositions or apparatus therefor
    • A23L3/3418—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with chemicals in the form of gases, e.g. fumigation; Compositions or apparatus therefor in a controlled atmosphere, e.g. partial vacuum, comprising only CO2, N2, O2 or H2O
    • A23L3/3427—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with chemicals in the form of gases, e.g. fumigation; Compositions or apparatus therefor in a controlled atmosphere, e.g. partial vacuum, comprising only CO2, N2, O2 or H2O in which an absorbent is placed or used
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/20—Compounding polymers with additives, e.g. colouring
    • C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
    • C08J3/223—Packed additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/20—Compounding polymers with additives, e.g. colouring
    • C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
    • C08J3/226—Compounding polymers with additives, e.g. colouring using masterbatch techniques using a polymer as a carrier
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
    • C08K13/02—Organic and inorganic ingredients
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04—Homopolymers or copolymers of ethene
    • C08J2323/06—Polyethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/10—Homopolymers or copolymers of propene
    • C08J2323/12—Polypropene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2325/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
    • C08J2325/02—Homopolymers or copolymers of hydrocarbons
    • C08J2325/04—Homopolymers or copolymers of styrene
    • C08J2325/06—Polystyrene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/012—Additives improving oxygen scavenging properties
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
    • C08K3/014—Stabilisers against oxidation, heat, light or ozone
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
    • C08K3/015—Biocides
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
    • C08K5/0058—Biocides

Definitions

  • Additive Composition The present invention relates to an additive composition for a polymer substrate having oxygen scavenging and antimicrobial properties and a method for making the same.
  • the quality, shelf life and consistency of food products are determined largely by the level of hygiene maintained during the preparation of the food products, and the manner in which the food product is packaged and stored.
  • a food product must not contain levels of contaminants, such as pathogens or toxins that are likely to cause illness upon consumption.
  • Food products must also not contain contaminants at a level which results in the product becoming organoleptically spoiled in an unacceptably short period of time.
  • Food products harbouring harmful bacteria, viruses, parasites and/or chemical substances have the potential to cause in excess of 200 diseases in humans.
  • Food safety requires scrupulous handling, preparing, packaging and storing in order to reduce the risk of human infection and to ensure that the product is of high quality, has an acceptable shelf life, and exhibits consistent characteristics between products of the same type.
  • Effective chemical routine disinfection in food processing plants requires potent chemical solutions to be applied to and left in contact with surfaces for prolonged periods of time. Meticulous safety standards and protocols must be adhered to in order to reduce the risk of such solutions contaminating food products.
  • packaging materials become the primary source of pathogens which may contaminate the food product in a processing unit. Packaging is usually the final step in the handling of food products, and is critical for ensuring food quality and maximising shelf life.
  • Oxygen scavengers are known materials which prevent oxidative damage of food products by absorbing oxygen present in the headspace of the packaging, so as to prevent or reduce the interaction of oxygen with the food product.
  • oxygen scavengers are packaged in small, oxygen permeable sachets.
  • Typical oxygen scavengers include metallic reducing agents, such as ferrous carbonate, or non-ferrous agents such as ascorbate with sodium hydrogen carbonate, or glucose oxidase.
  • an additive composition for a polymer substrate comprising a carrier material, an oxygen scavenger, and either an antimicrobial substance or a food preservative, wherein the oxygen scavenger, antimicrobial substance and food preservative are different materials.
  • the additive composition when the additive composition is incorporated into a polymer substrate, the additive composition imparts antimicrobial properties (due to the antimicrobial substance or food preservative) and oxygen absorbing properties to the polymer substrate. This is particularly advantageous for polymer substrates where the intended use is as food packaging.
  • the additive composition By incorporating the additive composition into food packaging substrates, shelf life of food is increased.
  • the additive composition thus acts to reduce food waste, as the packaged food remains fresher for longer. In turn, this reduces costs associated with food preparation and packaging.
  • a particular advantage of the additive composition is that oxygen absorbing properties are imparted to the polymer substrate (e.g. food packaging material) and the packaging products without the need for a separate sachet of oxygen scavenging material. This mitigates problems such as those described above, such as preventing the risk of contamination of the packaged food product, and preventing accidental ingestion of the packet of oxygen scavenger material by the consumer. With oxygen absorbing properties imparted to the packaging material, waste is reduced because a separate sachet of oxygen scavenger material is redundant.
  • the additive composition is not limited to being incorporated into a polymer substrate suitable for food packaging.
  • the additive composition may be incorporated into any suitable polymer substrate.
  • the composition may be used in a polymer substrate which is intended for packaging medicines or sanitary products. It is important that medicines and sanitary products remain sterile during the period between packaging and consumption by the user.
  • the oxygen scavenger is selected from the group comprising iron (II) sulphate, ascorbic acid, silica gel, iron powder, sodium ascorbate, potassium ascorbate, a photosensitive dye, an enzyme, iron carbonate, an unsaturated fatty acid, glucose oxide, and/or metallic and organometallic compounds.
  • the antimicrobial substance is selected from the group comprising sodium pyrithione, ammonium pyrithione, zinc pyrithione, and/or copper pyrithione.
  • Pyrithiones are powerful yet safe antimicrobial substances. They have a wide spectrum efficacy against bacteria (both Gram-positive and Gram-negative), fungi, viruses and algae.
  • the antimicrobial substance is 4,5-dichloro-2-octyl-2H-isothiazol-3-one.
  • 4,5-dichloro-2-octyl-2H-isothiazol-3-one has a known safety profile.
  • the antimicrobial substance is a silver/zinc zeolite.
  • the antimicrobial substance is biphenyl-2-ol.
  • biphenyl-2-ol is effective against fungi.
  • the food preservative is selected from the group comprising sodium benzoate, potassium benzoate, sodium metabisulfite, potassium sulfite, sorbic acid, potassium sorbate, propionic acid, sodium propionate, calcium propionate, sulfur dioxide, sodium acetate, sodium butyrate, and/or ethyl paraben.
  • the oxygen scavenger is ascorbic acid, and either the antimicrobial substance is zinc pyrithione, and the food preservative is sodium benzoate or potassium sorbate.
  • the oxygen scavenger is iron (II) sulfate, and either the antimicrobial substance is silver/zinc zeolite, or the food preservative is sodium nitrite.
  • the oxygen scavenger is silica gel, and either the antimicrobial substance is copper pyrithione, or the food preservative is trisodium citrate.
  • the oxygen scavenger is iron (II) sulfate, and either the antimicrobial substance is zinc pyrithione, or the food preservative is sodium benzoate.
  • the oxygen scavenger is ascorbic acid, and either the antimicrobial substance is silver/zinc zeolite, or the food preservative is potassium sorbate.
  • the oxygen scavenger is potassium ascorbate, and either the antimicrobial substance is biphenyl-2-ol, or the food preservative is n-decanoic acid.
  • the above specific combinations of oxygen scavenger and either antimicrobial substance or food preservative provide particularly improved shelf life of food products when the additive composition is incorporated into a polymer substrate.
  • the concentration of the oxygen scavenger is from 25 w/w% to 45 w/w%, preferably from 30 w/w% to 40 w/w%.
  • the concentration of the antimicrobial substance is from 2.5 w/w% to 30 w/w%, preferably from 5 w/w% to 25 w/w%.
  • the concentration of the food preservative is from 30 w/w% to 50 w/w%, preferably from 35 w/w% to 45 w/w%.
  • a food packaging comprising an additive composition to the first aspect of the invention.
  • the food packaging may be a cling film or a stretch film.
  • the cling film or stretch film may be manufactured as rolls.
  • a method of making an additive composition according to the first aspect of the invention comprising the steps of: a) mixing oxygen scavenger particles with a carrier material to form a mixture; b) adding either antimicrobial substance particles or food preservative particles to the mixture; c) heating the mixture to a temperature in the range of from 50 °C to 200 °C; and d) processing the mixture to form at least one pellet of additive composition.
  • step c) comprises heating the mixture to a temperature in the range of 50 °C to 170 °C.
  • this temperature range prevents decomposition of an additive composition including ascorbic acid as an oxygen scavenger, because this temperature range is below the melting point of ascorbic acid.
  • an additive composition for a polymer substrate according to the present invention is provided.
  • the additive composition can thus be incorporated into a polymer substrate, such as plastic packaging for food products.
  • Examples A to F as set out below provide comparisons between control packaging materials (i.e. packaging materials which do not incorporate an oxygen scavenger, an antimicrobial substance or a food preservative) and packaging materials which incorporate an antimicrobial substance or a food preservative.
  • active ingredient includes an oxygen scavenger, an antimicrobial substance, and a food preservative.
  • concentrations of the active ingredients listed in Examples A to F are with respect to the packaging material (i.e. not with respect to only the additive composition).
  • shelf life as used in the context of Examples A to F is the period of time for which the food product remains safe for human consumption. In other words, the shelf life is the time elapsed before spots of mould/fungi appear or bacterial contamination occurs.
  • Example A Example A relates to the shelf life of packaged hamburgers and sausage meat stored at 4 °C.
  • Example B Example B relates to the shelf life of packaged beef and lamb steaks when stored at 4 °C.
  • Example C Example C relates to the shelf life of packaged shelled walnuts when stored at 20 °C (i.e. room temperature).
  • Example D Example D relates to the shelf life of packaged brie cheese stored at 4 °C.
  • Example E relates to the shelf life of packaged feta cheese when stored at 4 °C.
  • Example F relates to the shelf life of packaged raw seafood when stored at 4 °C.
  • control packaging materials incorporating an oxygen scavenger and either an antimicrobial substance or a food preservative improved the shelf life of the packaged food products compared with control packaging containing no active ingredients, or control packaging only containing a single active ingredient.
  • the additive composition is incorporated into a polymer substrate which may be flexible or rigid plastic packaging material.
  • the plastic packaging material is a film.
  • the addition rate of the additive composition into the plastic film is 5,000 ppm to 150,000 ppm and more preferably between 10,000 ppm to 100,000 ppm.
  • the additive composition may be incorporated into the inner layer of a multi-layered plastic packaging material.
  • the inner layer is the layer which, in use, is adjacent the packaged product (e.g. a food product).
  • the additive composition may be incorporated into the inner layer and a layer adjacent the inner layer. If the plastic packaging material includes only a single layer, then the additive composition may be incorporated into the single layer.
  • the additive composition comprises an oxygen scavenger and an antimicrobial substance.
  • the concentration of the oxygen scavenger with respect to the plastic packaging material is between 1,250 ppm to 45,000 ppm. More preferably, the concentration of the oxygen scavenger with respect to the plastic packaging material is between 1,500 ppm to 40,000 ppm.
  • the concentration of the antimicrobial substance with respect to the plastic packaging material is between 125 ppm and 30,000 ppm, and more preferably between 250 ppm and 25,000 ppm.
  • the additive composition comprises an oxygen scavenger and a food preservative.
  • the concentration of the oxygen scavenger with respect to the plastic packaging material is between 1,000 ppm to 40,000 ppm. More preferably, the concentration of the oxygen scavenger with respect to the plastic packaging material is between 10,000 ppm to 30,000 ppm.
  • the concentration of the food preservative with respect to the plastic packaging material is between 125 ppm and 30,000 ppm, and more preferably between 250 ppm and 25,000 ppm.
  • a method of making an additive composition includes the following steps: a) mixing oxygen scavenger particles with a carrier material to form a mixture; b) adding either antimicrobial particles or food preservative particles to the mixture; c) heating the mixture to a temperature in the range of from 50 °C to 200 °C; and d) processing the mixture to form at least one pellet of additive composition.
  • the oxygen scavenger and/or food preservative may be micronized before mixing in order to reduce their particle size. Micronization may be performed by jet milling the particles on a fluidised bed, under a dry atmosphere in order to prevent the components of the additive composition from becoming contaminated by moisture. Processing of the mixture to form at least one pellet of additive composition may be performed by any suitable method.
  • extrusion methods may be used.
  • a co- rotating twin screw extruder provides good dispersion of materials and eliminates moisture from the mixture.
  • a co-rotating twin screw extruder is useful for processing mixtures where the concentration of active ingredients in the additive composition is 50 w/w% or lower. Where the concentration of active ingredients in the additive composition is higher than 50 w/w%, a high shear kneader machine in combination with a pelletiser extruder may be more suitable.
  • the at least one pellet of additive composition produced by this method may be incorporated into a polymer substrate, such as packaging.
  • the packaging incorporating the at least one pellet of additive composition is processed at a temperature in the range of from 150 °C to 230 °C.

Abstract

The present invention relates to an additive composition for a polymer substrate and a method of making the same. The additive composition comprises a carrier material, an oxygen scavenger, and either an antimicrobial substance or a food preservative. The oxygen scavenger, antimicrobial substance and food preservative are different materials.

Description

Additive Composition The present invention relates to an additive composition for a polymer substrate having oxygen scavenging and antimicrobial properties and a method for making the same. The quality, shelf life and consistency of food products are determined largely by the level of hygiene maintained during the preparation of the food products, and the manner in which the food product is packaged and stored. A food product must not contain levels of contaminants, such as pathogens or toxins that are likely to cause illness upon consumption. Food products must also not contain contaminants at a level which results in the product becoming organoleptically spoiled in an unacceptably short period of time. Food products harbouring harmful bacteria, viruses, parasites and/or chemical substances have the potential to cause in excess of 200 diseases in humans. Food safety requires scrupulous handling, preparing, packaging and storing in order to reduce the risk of human infection and to ensure that the product is of high quality, has an acceptable shelf life, and exhibits consistent characteristics between products of the same type. Effective chemical routine disinfection in food processing plants requires potent chemical solutions to be applied to and left in contact with surfaces for prolonged periods of time. Meticulous safety standards and protocols must be adhered to in order to reduce the risk of such solutions contaminating food products. Once food products are prepared and conditioned, packaging materials become the primary source of pathogens which may contaminate the food product in a processing unit. Packaging is usually the final step in the handling of food products, and is critical for ensuring food quality and maximising shelf life. It is often not desirable to treat packaging materials with potent chemical solutions due to the risk that the solution could be transferred to the food product. It is also not possible to treat the internal structure of the food packaging, i.e. the part of the packaging which will eventually contact the food product, with disinfectants or sanitisers. Many types of food products are subject to decay. Thus, without intervention many food products have a relatively short shelf life. In particular, shelf life of food products suffers in warm and/or humid weather. Oxygen accelerates the deterioration of food products by facilitating growth of mold and aerobic bacteria on the surface of the products. Enzymes whch undergo oxidation can cause food to change colour. Some types of mold or bacteria renders food toxic or life threatening if consumed. Alternatively or additionally, decay of food may cause the food to develop undesirable flavours and aromas. This may change the texture of foods (e.g. they may become wet and soft, or dry and hard), and/or the nutritional value of the food may decrease. Oxygen scavengers are known materials which prevent oxidative damage of food products by absorbing oxygen present in the headspace of the packaging, so as to prevent or reduce the interaction of oxygen with the food product. Generally, oxygen scavengers are packaged in small, oxygen permeable sachets. Typical oxygen scavengers include metallic reducing agents, such as ferrous carbonate, or non-ferrous agents such as ascorbate with sodium hydrogen carbonate, or glucose oxidase. The use of small sachets of oxygen scavengers contained inside food packaging and alongside packaged food products means there is a risk that a consumer accidentally ingests the sachet and thus the oxygen scavenger. In addition, there is a risk of leakage of the oxygen scavenger material into the food and thus a risk of contamination of the food product, which may not be immediately apparent to the retailer or consumer upon visual inspection of the food product. Therefore, extensive research may be required to selective a suitable oxygen absorber and sachet material for a particular food product type, and additional warnings must be included on the packaging label. Thus, research and development costs are increased and the safety and satisfaction of consumers is compromised. It is an object of this invention to mitigate problems such as those described above. The term “oxygen scavenger” is used throughout this specification interchangeably with the term “oxygen absorber.” According to a first aspect of the invention there is provided an additive composition for a polymer substrate, the additive composition comprising a carrier material, an oxygen scavenger, and either an antimicrobial substance or a food preservative, wherein the oxygen scavenger, antimicrobial substance and food preservative are different materials. Advantageously, when the additive composition is incorporated into a polymer substrate, the additive composition imparts antimicrobial properties (due to the antimicrobial substance or food preservative) and oxygen absorbing properties to the polymer substrate. This is particularly advantageous for polymer substrates where the intended use is as food packaging. By incorporating the additive composition into food packaging substrates, shelf life of food is increased. The additive composition thus acts to reduce food waste, as the packaged food remains fresher for longer. In turn, this reduces costs associated with food preparation and packaging. A particular advantage of the additive composition is that oxygen absorbing properties are imparted to the polymer substrate (e.g. food packaging material) and the packaging products without the need for a separate sachet of oxygen scavenging material. This mitigates problems such as those described above, such as preventing the risk of contamination of the packaged food product, and preventing accidental ingestion of the packet of oxygen scavenger material by the consumer. With oxygen absorbing properties imparted to the packaging material, waste is reduced because a separate sachet of oxygen scavenger material is redundant. The additive composition is not limited to being incorporated into a polymer substrate suitable for food packaging. The additive composition may be incorporated into any suitable polymer substrate. For example, the composition may be used in a polymer substrate which is intended for packaging medicines or sanitary products. It is important that medicines and sanitary products remain sterile during the period between packaging and consumption by the user. Preferably, the oxygen scavenger is selected from the group comprising iron (II) sulphate, ascorbic acid, silica gel, iron powder, sodium ascorbate, potassium ascorbate, a photosensitive dye, an enzyme, iron carbonate, an unsaturated fatty acid, glucose oxide, and/or metallic and organometallic compounds. Such oxygen scavengers are easily incorporate into the additive composition and provide effective absorption of oxygen. Preferably, the antimicrobial substance is selected from the group comprising sodium pyrithione, ammonium pyrithione, zinc pyrithione, and/or copper pyrithione. Pyrithiones are powerful yet safe antimicrobial substances. They have a wide spectrum efficacy against bacteria (both Gram-positive and Gram-negative), fungi, viruses and algae. More preferably, the antimicrobial substance is 4,5-dichloro-2-octyl-2H-isothiazol-3-one. Advantageously, 4,5-dichloro-2-octyl-2H-isothiazol-3-one has a known safety profile. Alternatively, the antimicrobial substance is a silver/zinc zeolite. Surprisingly advantageous antimicrobial effects have been observed when the additive composition includes a silver/zinc zeolite. Preferably, the antimicrobial substance is biphenyl-2-ol. Advantageously, biphenyl-2-ol is effective against fungi. Preferably, the food preservative is selected from the group comprising sodium benzoate, potassium benzoate, sodium metabisulfite, potassium sulfite, sorbic acid, potassium sorbate, propionic acid, sodium propionate, calcium propionate, sulfur dioxide, sodium acetate, sodium butyrate, and/or ethyl paraben. Such food preservatives are widely available and can be easily incorporated into the additive composition. Preferably, the oxygen scavenger is ascorbic acid, and either the antimicrobial substance is zinc pyrithione, and the food preservative is sodium benzoate or potassium sorbate. Preferably, the oxygen scavenger is iron (II) sulfate, and either the antimicrobial substance is silver/zinc zeolite, or the food preservative is sodium nitrite. Preferably, the oxygen scavenger is silica gel, and either the antimicrobial substance is copper pyrithione, or the food preservative is trisodium citrate. Preferably, the oxygen scavenger is iron (II) sulfate, and either the antimicrobial substance is zinc pyrithione, or the food preservative is sodium benzoate. Preferably, the oxygen scavenger is ascorbic acid, and either the antimicrobial substance is silver/zinc zeolite, or the food preservative is potassium sorbate. Preferably, the oxygen scavenger is potassium ascorbate, and either the antimicrobial substance is biphenyl-2-ol, or the food preservative is n-decanoic acid. As set out in specific Examples A to F below, the above specific combinations of oxygen scavenger and either antimicrobial substance or food preservative provide particularly improved shelf life of food products when the additive composition is incorporated into a polymer substrate. Preferably, the concentration of the oxygen scavenger is from 25 w/w% to 45 w/w%, preferably from 30 w/w% to 40 w/w%. Preferably, the concentration of the antimicrobial substance is from 2.5 w/w% to 30 w/w%, preferably from 5 w/w% to 25 w/w%. Preferably, the concentration of the food preservative is from 30 w/w% to 50 w/w%, preferably from 35 w/w% to 45 w/w%. According to a second aspect of the invention, there is provided food packaging comprising an additive composition to the first aspect of the invention. The food packaging may be a cling film or a stretch film. The cling film or stretch film may be manufactured as rolls. According to a third aspect of the invention, there is provided a method of making an additive composition according to the first aspect of the invention comprising the steps of: a) mixing oxygen scavenger particles with a carrier material to form a mixture; b) adding either antimicrobial substance particles or food preservative particles to the mixture; c) heating the mixture to a temperature in the range of from 50 °C to 200 °C; and d) processing the mixture to form at least one pellet of additive composition. Preferably, step c) comprises heating the mixture to a temperature in the range of 50 °C to 170 °C. Advantageously, this temperature range prevents decomposition of an additive composition including ascorbic acid as an oxygen scavenger, because this temperature range is below the melting point of ascorbic acid. In use, an additive composition for a polymer substrate according to the present invention is provided. The additive composition can thus be incorporated into a polymer substrate, such as plastic packaging for food products. Examples A to F as set out below provide comparisons between control packaging materials (i.e. packaging materials which do not incorporate an oxygen scavenger, an antimicrobial substance or a food preservative) and packaging materials which incorporate an antimicrobial substance or a food preservative. The term “active ingredient” includes an oxygen scavenger, an antimicrobial substance, and a food preservative. The concentrations of the active ingredients listed in Examples A to F are with respect to the packaging material (i.e. not with respect to only the additive composition). The term “shelf life” as used in the context of Examples A to F is the period of time for which the food product remains safe for human consumption. In other words, the shelf life is the time elapsed before spots of mould/fungi appear or bacterial contamination occurs. Example A Example A relates to the shelf life of packaged hamburgers and sausage meat stored at 4 °C.
Figure imgf000007_0001
Figure imgf000008_0001
Example B Example B relates to the shelf life of packaged beef and lamb steaks when stored at 4 °C.
Figure imgf000008_0002
Example C Example C relates to the shelf life of packaged shelled walnuts when stored at 20 °C (i.e. room temperature).
Figure imgf000009_0001
Example D Example D relates to the shelf life of packaged brie cheese stored at 4 °C.
Figure imgf000009_0002
Figure imgf000010_0001
Example E Example E relates to the shelf life of packaged feta cheese when stored at 4 °C.
Figure imgf000010_0002
Figure imgf000011_0001
Example F Example F relates to the shelf life of packaged raw seafood when stored at 4 °C.
Figure imgf000011_0002
Figure imgf000012_0001
As can be seen from Examples A to F above, control packaging materials incorporating an oxygen scavenger and either an antimicrobial substance or a food preservative improved the shelf life of the packaged food products compared with control packaging containing no active ingredients, or control packaging only containing a single active ingredient. In a preferred embodiment, the additive composition is incorporated into a polymer substrate which may be flexible or rigid plastic packaging material. In some embodiments, the plastic packaging material is a film. The addition rate of the additive composition into the plastic film is 5,000 ppm to 150,000 ppm and more preferably between 10,000 ppm to 100,000 ppm. In a preferred embodiment, the additive composition may be incorporated into the inner layer of a multi-layered plastic packaging material. The inner layer is the layer which, in use, is adjacent the packaged product (e.g. a food product). In an alternative embodiment, the additive composition may be incorporated into the inner layer and a layer adjacent the inner layer. If the plastic packaging material includes only a single layer, then the additive composition may be incorporated into the single layer. In a preferred embodiment, the additive composition comprises an oxygen scavenger and an antimicrobial substance. The concentration of the oxygen scavenger with respect to the plastic packaging material is between 1,250 ppm to 45,000 ppm. More preferably, the concentration of the oxygen scavenger with respect to the plastic packaging material is between 1,500 ppm to 40,000 ppm. In this embodiment, the concentration of the antimicrobial substance with respect to the plastic packaging material is between 125 ppm and 30,000 ppm, and more preferably between 250 ppm and 25,000 ppm. In an alternative embodiment, the additive composition comprises an oxygen scavenger and a food preservative. The concentration of the oxygen scavenger with respect to the plastic packaging material is between 1,000 ppm to 40,000 ppm. More preferably, the concentration of the oxygen scavenger with respect to the plastic packaging material is between 10,000 ppm to 30,000 ppm. In this embodiment, the concentration of the food preservative with respect to the plastic packaging material is between 125 ppm and 30,000 ppm, and more preferably between 250 ppm and 25,000 ppm. A method of making an additive composition includes the following steps: a) mixing oxygen scavenger particles with a carrier material to form a mixture; b) adding either antimicrobial particles or food preservative particles to the mixture; c) heating the mixture to a temperature in the range of from 50 °C to 200 °C; and d) processing the mixture to form at least one pellet of additive composition. In some embodiments, the oxygen scavenger and/or food preservative may be micronized before mixing in order to reduce their particle size. Micronization may be performed by jet milling the particles on a fluidised bed, under a dry atmosphere in order to prevent the components of the additive composition from becoming contaminated by moisture. Processing of the mixture to form at least one pellet of additive composition may be performed by any suitable method. For example, extrusion methods may be used. A co- rotating twin screw extruder provides good dispersion of materials and eliminates moisture from the mixture. A co-rotating twin screw extruder is useful for processing mixtures where the concentration of active ingredients in the additive composition is 50 w/w% or lower. Where the concentration of active ingredients in the additive composition is higher than 50 w/w%, a high shear kneader machine in combination with a pelletiser extruder may be more suitable. The at least one pellet of additive composition produced by this method may be incorporated into a polymer substrate, such as packaging. The packaging incorporating the at least one pellet of additive composition is processed at a temperature in the range of from 150 °C to 230 °C.

Claims

Claims 1. An additive composition for a polymer substrate, the additive composition comprising a carrier material, an oxygen scavenger, and either an antimicrobial substance or a food preservative, wherein the oxygen scavenger, antimicrobial substance and food preservative are different materials.
2. An additive composition according to claim 1, wherein the oxygen scavenger is selected from the group comprising iron (II) sulphate, ascorbic acid, silica gel, iron powder, sodium ascorbate, potassium ascorbate, a photosensitive dye, an enzyme, iron carbonate, an unsaturated fatty acid, glucose oxide, and/or metallic and organometallic compounds.
3. An additive composition according to any preceding claim, wherein the antimicrobial substance is selected from the group comprising sodium pyrithione, ammonium pyrithione, zinc pyrithione, and/or copper pyrithione.
4. An additive composition according to any preceding claim, wherein the antimicrobial substance is 4,5-dichloro-2-octyl-2H-isothiazol-3-one.
5. An additive composition according to any preceding claim, wherein the antimicrobial substance is a silver/zinc zeolite.
6. An additive composition according to any preceding claim, wherein the antimicrobial substance is biphenyl-2-ol.
7. An additive composition according to any preceding claim, wherein the food preservative is selected from the group comprising sodium benzoate, potassium benzoate, sodium metabisulfite, potassium sulfite, sorbic acid, potassium sorbate, propionic acid, sodium propionate, calcium propionate, sulfur dioxide, sodium acetate, sodium butyrate, ethyl paraben, and/or n-decanoic acid.
8. An additive composition according to claim 1, wherein the oxygen scavenger is ascorbic acid, and either the antimicrobial substance is zinc pyrithione, or the food preservative is sodium benzoate or potassium sorbate.
9. An additive composition according to claim 1, wherein the oxygen scavenger is iron (II) sulfate, and either the antimicrobial substance is silver/zinc zeolite, or the food preservative is sodium nitrite.
10. An additive composition according to claim 1, wherein the oxygen scavenger is silica gel, and either the antimicrobial substance is copper pyrithione, or the food preservative is trisodium citrate.
11. An additive composition according to claim 1, wherein the oxygen scavenger is iron (II) sulfate, and either the antimicrobial substance is zinc pyrithione, or the food preservative is sodium benzoate.
12. An additive composition according to claim 1, wherein the oxygen scavenger is ascorbic acid, and either the antimicrobial substance is silver/zinc zeolite, or the food preservative is potassium sorbate.
13. An additive composition according to claim 1, wherein the oxygen scavenger is potassium ascorbate, and either the antimicrobial substance is biphenyl-2-ol, or the food preservative is n-decanoic acid.
14. An additive composition according to any preceding claim, wherein a concentration of the oxygen scavenger is from 25 w/w% to 45 w/w%, preferably from 30 w/w% to 40 w/w%.
15. An additive composition according to any preceding claim, wherein a concentration of the antimicrobial substance is from 2.5 w/w% to 30 w/w%, preferably from 5 w/w% to 25 w/w%.
16. An additive composition according to any preceding claim, wherein a concentration of the food preservative is from 30 w/w% to 50 w/w%, preferably from 35 w/w% to 45 w/w%.
17. Food packaging comprising an additive composition according to any preceding claim.
18. A method of making an additive composition according to any one of claims 1 to 16 comprising the steps of: a) mixing oxygen scavenger particles with a carrier material to form a mixture; b) adding either antimicrobial substance particles or food preservative particles to the mixture; c) heating the mixture to a temperature in the range of from 50 °C to 200 °C; and d) processing the mixture to form at least one pellet of additive composition.
19. A method according to claim 18, wherein step c) comprises heating the mixture to a temperature in the range of 50 °C to 170 °C.
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