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CN-122029323-A - Composition for providing barrier properties to paper, paperboard and textiles

CN122029323ACN 122029323 ACN122029323 ACN 122029323ACN-122029323-A

Abstract

Compositions for providing barrier properties such as liquid resistance and/or oil and/or grease resistance to substrates, their preparation and use and substrates and articles derived therefrom, such as food containers, trays, straws, bags (made of paper and textile), cloths and bowls. It has been found that substrates treated with the composition have improved properties in terms of liquid resistance, grease resistance and oil resistance even after a subsequent folding step, for example in a subsequent folding step to obtain a food container.

Inventors

  • George Mayer de Oliveira
  • Damian Julian Colpe

Assignees

  • 昂高知识产权有限公司

Dates

Publication Date
20260512
Application Date
20241011
Priority Date
20231013

Claims (16)

  1. 1. A composition for providing barrier properties, in particular liquid resistance, to a substrate comprising at least components (a) and (B2), wherein (a) is at least one copolymer comprising the following monomer units: (A1) At least one monomer selected from the group consisting of styrene, methyl methacrylate, (meth) acrylonitrile, alpha-methylstyrene, or mixtures thereof, and (A2) At least one monomer comprising acrylate units, and (B2) Is at least one styrene maleic anhydride ester.
  2. 2. The composition of claim 1, wherein component (a) is present in an amount ranging from 30.0 wt% to 90.0 wt%; component (B2) is present in an amount ranging from 2.0 wt% to 40.0 wt%, wherein the sum of the dry mass percentages of components (a) and (B2) is 100 wt%.
  3. 3. Method for manufacturing a composition according to at least one of the preceding claims 1 or 2, comprising at least the following step a): a) Substeps i., ii., optionally iii.) are performed. I. ) Providing component (B2) to the first reaction zone; ii) providing at least the monomers (A1) and (A2) to a second reaction zone to obtain a monomer mixture, optionally combining the monomer mixture in the second reaction zone with the mixture in the first reaction zone, and copolymerizing the monomer mixture to obtain component (A), or providing component (A) directly; iii.) optionally mixing the composition obtained in step i.and/or the composition obtained in step ii.to provide a first copolymer mixture; wherein optionally in any of steps a) i, a) ii, or a) iii, one or more additional components may be added to the respective mixtures.
  4. 4. A composition for providing barrier properties to a substrate comprising at least components (A), (B1) and/or (B2) and (C), wherein (A) Is at least one copolymer comprising the following monomer units: (A1) At least one monomer selected from the group consisting of styrene, methyl methacrylate, (meth) acrylonitrile, alpha-methylstyrene, or mixtures thereof, and (A2) At least one monomer comprising acrylate units, and (B1) Is at least one styrene maleic anhydride copolymer and/or (B2) Is at least one styrene maleic anhydride ester, and (C) Is at least one elastomer and/or at least one wax, preferably at least one vegetable wax.
  5. 5. The composition according to at least one of the preceding claims 1 to 4, wherein at least one monomer (A1) is present in an amount of 20.0 to 75.0 wt% and/or at least one monomer (A2) is present in an amount of 25.0 to 80.0 wt%, preferably wherein the at least one monomer (A1) is present in an amount of 25.0 to 65.0 wt% and/or the at least one monomer (A2) is present in an amount of 35.0 to 75.0 wt%, optionally wherein one or more other monomers (A3) may be present in the copolymer in an amount of up to 5wt%, the copolymer comprising components (A1), (A2) and optionally (A3) equal to 100 wt%.
  6. 6. The composition according to at least one of claims 1 to 5, wherein at least one monomer (A2) is selected from alkyl acrylates or alkyl methacrylates other than methyl methacrylate, including methyl acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, isobutyl acrylate, pentyl acrylate, hexyl acrylate, 2-ethylhexyl acrylate, octyl acrylate, isooctyl acrylate, decyl acrylate, dodecyl acrylate, isomers thereof, and combinations thereof, and/or wherein one or more other monomers (A3) is selected from (meth) acrylamide, (meth) acrylic acid, 1, 3-butanediol dimethacrylate, 1, 4-butanediol dimethacrylate, diethylene glycol dimethacrylate, dipropylene glycol dimethacrylate, divinylbenzene, ethylene glycol dimethacrylate, itaconic acid, N-methylol (meth) acrylamide, 4-methyl-1, 4-pentanediol dimethacrylate, propylene glycol dimethacrylate, trivinylbenzene, or mixtures thereof.
  7. 7. Composition according to at least one of the preceding claims 4 to 6, wherein the at least one elastomer is selected from the group consisting of ethylene/vinyl acetate, polybutadiene, natural latex, synthetic latex, styrene-butadiene emulsion, or mixtures thereof, preferably wherein component (C) is natural latex or polybutadiene or mixtures thereof, and/or wherein the vegetable wax is selected from the group consisting of soy wax, carnauba wax, beeswax, corn wax, coconut wax, palm oil, corn hydrogenated oil, coconut hydrogenated oil, castor hydrogenated oil, rapeseed hydrogenated oil, or combinations thereof.
  8. 8. The composition according to at least one of the preceding claims 1 to 7, wherein the composition may comprise at least one other component selected from the group consisting of nonionic surfactants, ionic surfactants, pH adjusting agents, preservatives, dyes, pigments, defoamers, thickeners, waxes, wetting agents, plasticizers, or combinations thereof.
  9. 9. The composition according to at least one of the preceding claims 1 to 8, wherein the composition is a dry composition, preferably a powder or a granule, or wherein the composition is a liquid composition comprising a solvent, such as an organic solvent or water, preferably wherein the composition is an aqueous emulsion, an aqueous suspension, an aqueous solution, an aqueous slurry or a mixture thereof.
  10. 10. The composition according to at least one of the preceding claims 4 to 9, wherein component (a) is present in an amount ranging from 30.0 wt% to 90.0 wt%; Component (B1) and/or (B2) are present in an amount in the range of 2.0 wt% to 40.0 wt%; component (C) in which the at least one elastomer is present in an amount in the range from 1.0 wt% to 42.0 wt% and/or the at least one wax is present in an amount in the range from 1 wt% to 50wt%, Wherein the sum of the total dry mass percentages of components (A), (B1) and/or (B2) and (C) is 100 wt%.
  11. 11. Method for manufacturing a composition according to at least one of the preceding claims 4 to 10, comprising at least the following steps a) and b): a) Substeps i., ii., optionally iii.) are performed. I. ) Providing components (B1) and/or (B2) to the first reaction zone; ii) providing at least the monomers (A1) and (A2) to a second reaction zone to obtain a monomer mixture, optionally combining the monomer mixture in the second reaction zone with the mixture in the first reaction zone, and copolymerizing the monomer mixture to obtain component (A), or providing component (A) directly; iii.) optionally mixing the composition obtained in step i.and/or the composition obtained in step ii.to provide a first copolymer mixture; b) Adding component (C) to the first copolymer mixture obtained in step a); wherein optionally in any of steps a) i, a) ii, a) iii, or b), one or more additional components may be added to the respective mixtures.
  12. 12. Use of a composition according to at least one of claims 4 to 10 or a composition manufactured according to the method of claim 11 as a barrier, in particular an oil barrier and/or a grease barrier, said composition being further used for resistance to folding if (C) is at least one elastomer, as a liquid barrier on a substrate if (C) is at least one wax, preferably wherein the substrate is a cellulose-based substrate, preferably paper or cardboard, or a substrate based on a synthetic polymer such as nylon, or a substrate based on a natural material such as wool, or a mixture of two or more of these substrates, and use of a composition according to at least one of claims 1,2, 5 and 6, 8 and 9 or a composition manufactured according to the method of claim 3 as a liquid barrier or a heat seal on a substrate, preferably wherein the substrate is a cellulose-based substrate, preferably paper or cardboard, or a substrate based on a synthetic polymer such as nylon, or a substrate based on a natural material such as wool, or a mixture of two or more of these substrates.
  13. 13. A coated substrate, wherein the coating of the substrate comprises or consists of a composition according to at least one of claims 1 to 10 or a composition manufactured according to the method of claim 3 or 11, preferably wherein the substrate is a cellulose-based substrate, preferably paper or paperboard, or a substrate based on a synthetic polymer such as nylon, or a substrate based on a natural material such as wool, or a mixture of two or more of these substrates, preferably wherein the coated substrate further comprises an overcoat selected from the group consisting of moisture barriers, oxygen barriers, heat seals, gas barriers, aesthetic overcoats such as printed, varnish or gloss providing overcoats, or combinations thereof.
  14. 14. A method of manufacturing the coated substrate of claim 13, comprising the steps of: I) Applying a composition according to at least one of claims 1 to 10 or a composition manufactured according to the method of claim 3 or 11 to a substrate; II) drying the composition according to at least one of claims 1 to 10 or the composition manufactured according to the method of claim 3 or 11 on the substrate.
  15. 15. A method of manufacturing an article comprising or consisting of the coated substrate according to claim 13 or the coated substrate manufactured according to the method of claim 14, wherein the coated substrate is subjected to a measure selected from the group comprising cutting, folding, gluing, curing, dyeing, or a combination thereof.
  16. 16. An article comprising or consisting of the coated substrate according to claim 13 or the coated substrate manufactured according to the method of claim 14, or manufactured according to the method of claim 15, wherein the article is a food or beverage container, tray, straw, bag, bowl, cloth, bag (made of paper or textile).

Description

Composition for providing barrier properties to paper, paperboard and textiles Technical Field The present invention relates to compositions comprising copolymers comprising styrene units and acrylate units and styrene maleic anhydride copolymers, methods of manufacture, and the use of these compositions for providing barrier properties (such as oil barrier, liquid barrier and/or grease barrier) and/or heat seal properties to substrates such as paper, paperboard or textiles. Background Packaging has become a critical factor in the purchase of food products. The purpose of the food packaging is for transportation and storage. Packaging of food is part of the marketing and distribution process. The primary function of food packaging is to protect the food from external influences and damage. Plastics are the most common and widespread materials for food packaging. Among plastics for food packaging, polyolefin and polyester are the most common materials. In recent years, plastic contamination has attracted worldwide attention due to global environmental concerns. Plastic waste not only destroys the ecosystem and biodiversity, but also threatens human life and health. Thus, the packaging industry must discard plastic packaging in order to find a more recyclable solution. With the development of this trend, paper and paperboard packaging has become an increasingly demanding alternative to sustainable and more environmentally friendly materials, and in this way, develop better solutions for renewable, recyclable packaging. While paper and paperboard are alternatives to this more sustainable packaging material requirement, they do not have the required barrier properties to provide protection against water, grease, oil and other substances. Paper and paperboard have very low barrier properties because the material is very porous and thus has high permeability. Paper and board consist of cellulose fibers extracted from trees, which are combined with additives to form a continuous entangled web, forming the structure of the material. Cardboard is a relatively thicker and heavier material than paper. It is widely used as a secondary package, which is not normally in direct contact with food. Its main use is in the form of boxes and containers. However, to be a viable alternative, the barrier properties of the paperboard need to be improved. The first step is to develop paper and textile based packaging using fluorochemical treated fibers. However, the fluorochemical is currently under pressure because it is suspected of having durability in the environment. There remains a need for more sustainable solutions than fluorochemicals. Polyethylene (PE) also dominates as a barrier coating in packaging applications due to its properties, especially providing water resistance. However, recycling PE coated packages in standard recycling facilities can be challenging. Another problem is that the PE coating may contaminate the fibers during the repulping process, thereby impeding the fibers from being recycled in this way. On the other hand, barrier coatings for food packaging have been made from synthetic polymer chemicals known as perfluoro and polyfluoroalkyl substances (PFAS) for oil and grease resistance. PFAS is a diverse group of compounds characterized by a hydrophobic, fluorine-saturated carbon chain attached to a hydrophilic functional group. This structure gives PFAS the ability to repel water and fat easily. However, PFAS cannot be easily separated from the paper, which means that the paper cannot be recycled or repulped. In addition to this limitation, the entire series of compounds has also been shown to have deleterious effects on human health. The paper and textile industry has been trying to use waxes, acrylic copolymers and mixtures of both for surface treatment, but has not been successful until now, but these compositions are known to exhibit weaknesses after folding and to significantly lose their barrier properties. Low Tg acrylate copolymers have been tested in such applications, but their use is very limited because of tackiness and blocking problems created by low Tg. Today, there is still a need in the market to find alternatives to plastics, a solution that maintains good barrier properties even after folding. Object of the invention It is therefore an object of the present invention to provide a composition which meets the above-mentioned requirements of the paper and textile industry in terms of barrier properties without the use of PFAS. Disclosure of Invention The inventors have found that the composition according to the invention provides good barrier properties (such as liquid, grease or oil resistance) and good heat sealing properties after being applied to the surface of a suitable substrate. Furthermore, it was found that the resistance (resistances) provided to the substrate treated with the composition according to the present invention is such that it better withstands the folding process