WO2024138379A1 - Use of coating system comprising acrylic pre-coat and silicone top-coat in a paper-based food container and the paper-based food container coated with the coating system - Google Patents
Use of coating system comprising acrylic pre-coat and silicone top-coat in a paper-based food container and the paper-based food container coated with the coating system Download PDFInfo
- Publication number
- WO2024138379A1 WO2024138379A1 PCT/CN2022/142469 CN2022142469W WO2024138379A1 WO 2024138379 A1 WO2024138379 A1 WO 2024138379A1 CN 2022142469 W CN2022142469 W CN 2022142469W WO 2024138379 A1 WO2024138379 A1 WO 2024138379A1
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- WO
- WIPO (PCT)
- Prior art keywords
- food container
- coat
- weight
- paper
- acrylic
- Prior art date
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- 235000013305 food Nutrition 0.000 title claims abstract description 165
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 title claims abstract description 137
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- 235000005607 chanvre indien Nutrition 0.000 description 1
- 229960003260 chlorhexidine Drugs 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000009089 cytolysis Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- BITPLIXHRASDQB-UHFFFAOYSA-N ethenyl-[ethenyl(dimethyl)silyl]oxy-dimethylsilane Chemical compound C=C[Si](C)(C)O[Si](C)(C)C=C BITPLIXHRASDQB-UHFFFAOYSA-N 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 150000002191 fatty alcohols Chemical class 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000005194 fractionation Methods 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- ACGUYXCXAPNIKK-UHFFFAOYSA-N hexachlorophene Chemical compound OC1=C(Cl)C=C(Cl)C(Cl)=C1CC1=C(O)C(Cl)=CC(Cl)=C1Cl ACGUYXCXAPNIKK-UHFFFAOYSA-N 0.000 description 1
- 229960004068 hexachlorophene Drugs 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 238000006459 hydrosilylation reaction Methods 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 235000008446 instant noodles Nutrition 0.000 description 1
- 239000002563 ionic surfactant Substances 0.000 description 1
- 229910052741 iridium Inorganic materials 0.000 description 1
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 1
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 1
- 125000004491 isohexyl group Chemical group C(CCC(C)C)* 0.000 description 1
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 1
- 125000001972 isopentyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 125000005395 methacrylic acid group Chemical group 0.000 description 1
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000003136 n-heptyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000001280 n-hexyl group Chemical group C(CCCCC)* 0.000 description 1
- 125000000740 n-pentyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000004123 n-propyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 235000012149 noodles Nutrition 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 1
- 150000004812 organic fluorine compounds Chemical class 0.000 description 1
- 229910052762 osmium Inorganic materials 0.000 description 1
- SYQBFIAQOQZEGI-UHFFFAOYSA-N osmium atom Chemical compound [Os] SYQBFIAQOQZEGI-UHFFFAOYSA-N 0.000 description 1
- 238000000643 oven drying Methods 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- NFHFRUOZVGFOOS-UHFFFAOYSA-N palladium;triphenylphosphane Chemical compound [Pd].C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 NFHFRUOZVGFOOS-UHFFFAOYSA-N 0.000 description 1
- FJKROLUGYXJWQN-UHFFFAOYSA-N papa-hydroxy-benzoic acid Natural products OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 150000003003 phosphines Chemical class 0.000 description 1
- AQSJGOWTSHOLKH-UHFFFAOYSA-N phosphite(3-) Chemical class [O-]P([O-])[O-] AQSJGOWTSHOLKH-UHFFFAOYSA-N 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 229920000747 poly(lactic acid) Polymers 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 235000021395 porridge Nutrition 0.000 description 1
- 235000010241 potassium sorbate Nutrition 0.000 description 1
- 239000004302 potassium sorbate Substances 0.000 description 1
- 229940069338 potassium sorbate Drugs 0.000 description 1
- MHWRYTCHHJGQFQ-UHFFFAOYSA-N prop-2-enoic acid hydrate Chemical compound O.OC(=O)C=C MHWRYTCHHJGQFQ-UHFFFAOYSA-N 0.000 description 1
- 125000004368 propenyl group Chemical group C(=CC)* 0.000 description 1
- JUJWROOIHBZHMG-UHFFFAOYSA-N pyridine Substances C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- 235000003499 redwood Nutrition 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 239000010948 rhodium Substances 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 229960004889 salicylic acid Drugs 0.000 description 1
- 125000002914 sec-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 125000003548 sec-pentyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- WXMKPNITSTVMEF-UHFFFAOYSA-M sodium benzoate Chemical compound [Na+].[O-]C(=O)C1=CC=CC=C1 WXMKPNITSTVMEF-UHFFFAOYSA-M 0.000 description 1
- 235000010234 sodium benzoate Nutrition 0.000 description 1
- 239000004299 sodium benzoate Substances 0.000 description 1
- 239000008234 soft water Substances 0.000 description 1
- 238000010186 staining Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- AGGIJOLULBJGTQ-UHFFFAOYSA-N sulfoacetic acid Chemical class OC(=O)CS(O)(=O)=O AGGIJOLULBJGTQ-UHFFFAOYSA-N 0.000 description 1
- 125000001273 sulfonato group Chemical group [O-]S(*)(=O)=O 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 230000009967 tasteless effect Effects 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
- ICUTUKXCWQYESQ-UHFFFAOYSA-N triclocarban Chemical compound C1=CC(Cl)=CC=C1NC(=O)NC1=CC=C(Cl)C(Cl)=C1 ICUTUKXCWQYESQ-UHFFFAOYSA-N 0.000 description 1
- 229960001325 triclocarban Drugs 0.000 description 1
- 125000002948 undecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
- 239000002025 wood fiber Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/10—Packing paper
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
- B65D81/34—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package
- B65D81/3484—Packages having self-contained heating means, e.g. heating generated by the reaction of two chemicals
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
- D21H19/24—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H19/32—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming a linkage containing silicon in the main chain of the macromolecule
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H19/58—Polymers or oligomers of diolefins, aromatic vinyl monomers or unsaturated acids or derivatives thereof
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/80—Paper comprising more than one coating
- D21H19/82—Paper comprising more than one coating superposed
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/80—Paper comprising more than one coating
- D21H19/84—Paper comprising more than one coating on both sides of the substrate
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/16—Sizing or water-repelling agents
Definitions
- the invention generally relates to the field of food packaging, and particularly to a paper-based food container, especially a paper-based self-heating food container, having a coating system comprising an acrylic pre-coat and a silicone top-coat, which shows excellent performances in terms of oil resistance property, water resistance property, high temperature water vapor barrier property, structure strength and also has a high recyclable percentage and thus has excellent recyclability and is environmentally friendly.
- a paper-based food container especially a paper-based self-heating food container having not only excellent water resistance and oil resistance, but also excellent other properties such as high temperature water vapor barrier property, structure strength and recyclability.
- An object of the invention is to provide a paper-based food container, especially a paper-based self-heating food container, having a coating system comprising an acrylic pre-coat and a silicone top-coat, which has excellent performances in one or more of the following properties, preferably in all of the following properties: water resistance, oil resistance, high temperature water vapor barrier property, structure strength and recyclability.
- Another object of the invention is to provide a paper-based food container, especially a paper-based self-heating food container, which is a green and environmentally friendly product and the materials used are harmless to the human body, non-toxic, tasteless, and readily degradable.
- Another object of the invention is to provide a paper-based food container, especially a paper-based self-heating food container, which has a transparent coating system.
- Another further object of the invention is to provide a paper-based food container, especially a paper-based self-heating food container, which has excellent high temperature resistance.
- the coating system is applied on all of the surface or on at least part of the surface of the food container, for example, on all of the inner surface and/or outer surface or on at least part of the inner surface and/or outer surface of the food container, preferably on all of the inner surface or on at least part of the inner surface of the food container.
- the acrylic emulsion is styrene acrylic copolymer emulsion, for example, NeoCryl A-2092 from COVESTRO or TOPSCREEN TC 612CN from Solenis.
- the pre-coat amount on the basis of dry weight of the acrylic emulsion is from 2 to 40g/m 2 , or from 3 to 30g/m 2 , or from 5 to 20g/m 2 , or from 10 to 15g/m 2
- the top-coat amount on the basis of dry weight of the silicone emulsion is from 1 to 40g/m 2 , or from 2 to 30g/m 2 , or from 3 to 25g/m 2 , or from 5 to 20g/m 2 , or from 10 to 15g/m 2
- the total coating amount on the basis of dry weight of the acrylic emulsion and the silicone emulsion is from 3 to 60g/m 2 , or from 5 to 50g/m 2 , or from 10 to 40g/m 2 , or from 15 to 30g/m 2 , or from 20 to 25g/m 2 .
- the food container is a pulp molded food container, preferably a self-heating pulp molded food container, such as a self-heating pulp molded hot pot, a self-heating pulp molded lunch box, a self-heating pulp molded beverage cup such as water cup.
- a self-heating pulp molded food container such as a self-heating pulp molded hot pot, a self-heating pulp molded lunch box, a self-heating pulp molded beverage cup such as water cup.
- the coating system is preferably defined according to the invention.
- the coating system is preferably defined according to the invention.
- the food container of the invention has excellent high temperature water vapor barrier property and unlikely allows gas and high temperature water vapor to permeate, and, thus, when self-heating is involved for example, it is possible to prevent the problem that gas and high temperature water vapor especially derived from food and/or from heating medium permeate through the container and leak to the outside and, in particular, condense on the table surface or the like facing the bottom surface of the container. Furthermore, the food container of the invention, even with the coating system, has good performance in terms of recyclability such as repulpability.
- High temperature water vapor barrier property is well known to a person skilled in the art. In particular when the self-heating application is involved, high temperature water vapor barrier property is used to evaluate whether a container is suitable for use as a self-heating container. In the invention, the measurement of the high temperature water vapor barrier property is described in the part of examples. Generally, the high temperature water vapor refers to the water vapor generated when water boils under ambient conditions. However, the self-heating in the context of the invention is not limited to heating at the boiling temperature. Self-heating temperature may be any temperature that can heat food.
- the solution according to the invention is not only beneficial to the environment, but also competitive with plastics in terms of performances and cost.
- the invention allows to replace plastics with paper without compromising product performances, even with improved performances and providing a competitive cost within an ecologically responsible framework.
- no fillers such as calcium carbonate and china clay etc. are added in the pulp.
- the pulp fibers used in the invention may originate from a variety of wood types, including hardwood and softwood.
- hardwood pulp fibers that can be used in the invention include, without limitation, oak, gum, maple, poplar, eucalyptus, aspen, birch, and others known to a person skilled in the art.
- softwood pulp fibers that can be used in the invention include, without limitation, spruce, pine, fir, hemlock, southern pine, redwood, and others known to a person skilled in the art.
- the pulp fibers may also originate from non-wood fibers such as linen, cotton, bagasse, hemp, straw, kenaf, sugarcane, bamboo, etc.
- the food container according to the invention may contain any edible substance preferably in solid or liquid state, for example, various instant foods, especially various self-heating instant foods, such as instant noodles, instant rice or instant hot pot foods, as well as various beverages, especially various self-heating beverages, such as coffee, tea or water.
- various instant foods especially various self-heating instant foods, such as instant noodles, instant rice or instant hot pot foods
- beverages especially various self-heating beverages, such as coffee, tea or water.
- the food container of the invention can be a self-heating food container, such as a self-heating hot pot, a self-heating lunch box, a self-heating beverage cup such as water cup and the like.
- the self-heating food container is a self-heating pulp molded food container, such as a self-heating pulp molded hot pot, a self-heating pulp molded lunch box, a self-heating pulp molded beverage cup such as water cup and the like.
- the self-heating food container is well known in the art, and usually includes a part for containing the food to be heated and a part for heating the food, which may be arranged integrally or separately.
- a part for containing the food to be heated and a part for heating the food, which may be arranged integrally or separately.
- other forms of self-heating containers may also be applicable to the invention.
- the acrylic monomer may be selected from the group consisting of a C 1 -C 12 alkyl acrylate or a C 1 -C 12 alkyl methacrylate, in which the C 1 -C 12 alkyl is, for example, linear or branched and may be selected from the group consisting of methyl, ethyl, n-propyl, 1-methyl-ethyl, n-butyl, 1-methyl-propyl, 2-methyl-propyl, 1, 1-dimethyl-ethyl, n-pentyl, 1-methyl-butyl, 3-methyl-butyl, n-hexyl, 1-methyl-pentyl, 2-methyl-pentyl, 4-methyl-pentyl, 2-ethyl-butyl, n-heptyl, 1-methyl-hexyl, n-octyl, 1-methyl-heptyl, 2-ethyl-hexyl, 5, 5-dimethyl-hexyl,
- the obtained acrylic pre-coat layer may have a thickness, for example, of 1 ⁇ m to 50 ⁇ m, or 3 ⁇ m to 30 ⁇ m, or 5 ⁇ m to 20 ⁇ m, or 6 ⁇ m to 10 ⁇ m.
- At least one polyorganosiloxane A comprising, per molecule, at least two C 2 -C 6 alkenyl radicals bonded to silicon atoms,
- this polyorganosiloxane A it is advantageous for this polyorganosiloxane A to have a viscosity of greater than or equal to 10 mPa ⁇ s at 25°C, such as between 20 and 300 mPa ⁇ s at 25°C, or greater than or equal to 1000 mPa ⁇ s at 25°C, or between 5000 and 200,000 mPa ⁇ s at 25°C.
- the polyorganosiloxane A may be formed solely of units of formula (A. 1) or may additionally comprise units of formula (A. 2) . Likewise, it can exhibit a linear, branched, cyclic or network structure. Its degree of polymerization is preferably between 2 and 5000.
- siloxyl units of formula (A. 2) are the SiO 4/2 , dimethylsiloxane, methylphenylsiloxane, diphenylsiloxane, methylsiloxane and phenylsiloxane units.
- the amount of the polyorganosiloxanes A in the silicone emulsion may be 15 to 60%by weight, preferably 25 to 50%by weight, and more preferably 30 to 40%by weight, with respect to the total weight of the silicone emulsion.
- the polyorganohydrogenosiloxane B is a polyorganosiloxane containing at least two hydrogen atoms per molecule, bonded to an identical or different silicon atom, and preferably containing at least three hydrogen atoms per molecule directly bonded to an identical or different silicon atom.
- the polyorganohydrogenosiloxane B is a polyorganosiloxane comprising:
- - Z 2 which may be identical or different, represents a monovalent hydrocarbon-based group containing from 1 to 30 carbon atoms, preferably selected from the group consisting of alkyl groups containing from 1 to 8 carbon atoms and aryl groups containing between 6 and 12 carbon atoms, and even more preferably selected from the group consisting of methyl, ethyl, propyl, 3, 3, 3-trifluoropropyl, xylyl, tolyl and phenyl radicals.
- this polyorganohydrogenosiloxane B it is advantageous for this polyorganohydrogenosiloxane B to have a viscosity of greater than or equal to 5 mPa ⁇ s at 25°C, preferably of greater than or equal to 10 mPa ⁇ s at 25°C and more preferably of between 20 and 1000 mPa ⁇ s at 25°C.
- the polyorganohydrogenosiloxane compound B may be formed solely from siloxyl units of formula (B. 1) or may also comprise units of formula (B. 2) . It may have a linear, branched or cyclic structure.
- the degree of polymerization is preferably greater than or equal to 2. More generally, it is less than 5000.
- siloxyl units of formula (B. 1) are especially the following units: H (CH 3 ) 2 SiO 1/2 , HCH 3 SiO 2/2 and H (C 6 H 5 ) SiO 2/2 .
- the examples of units of formula (B. 2) may be the same as those given above for the units of formula (A. 2) .
- the amount of the polyorganosiloxane B in the silicone emulsion may be 3 to 20%by weight, preferably 5 to 15%by weight, and more preferably 6 to 10%by weight, with respect to the total weight of the silicone emulsion.
- the amounts of the constituents A and B are such that in the silicone emulsion the [ ⁇ SiH] / [ ⁇ SiAlkenyl] mole ratio is between 0.5 and 7 and preferably between 1 and 5 with:
- platinum metal powder chloroplatinic acid, a complex of chloroplatinic acid with ⁇ -diketone, a complex a chloroplatinic acid with olefin, a complex of a chloroplatinic acid with 1, 3-divinyltetramethyldisiloxane, a complex of silicone resin powder that contains aforementioned catalysts, a rhodium compound, such as those expressed by formulae: RhCl (Ph 3 P) 3 , RhCl 3 [S (C 4 H 9 ) 2 ] 3 , etc. ; tetrakis (triphenyl) palladium, a mixture of palladium black and triphenylphosphine, etc.
- the catalyst ought preferably to be used in a catalytically sufficient amount, to allow sufficiently rapid crosslinking.
- 1 to 200 ppm by weight, preferably 2 to 100 ppm by weight, more preferably 3 to 50 ppm by weight of the catalyst are used, calculated based on the amount of platinum group metal, relative to the total silicone emulsion.
- the catalyst may be included in the silicone emulsion together with other constituents, or may be packaged separately from other constituents in the silicone emulsion. In the latter case, the catalyst may be mixed with other constituents in the silicone emulsion just before the use.
- a surfactant may be used in the silicone emulsion according to the invention.
- said surfactant is nonionic or ionic in nature.
- Poly (vinyl alcohol) s are compounds obtained indirectly from their esters by hydrolysis in aqueous medium or by alcoholysis in anhydrous medium.
- the esters used as starting material are commonly poly (vinyl acetate) s.
- the lysis of the esters resulting in the PVAs is generally incomplete. Acyl radicals remain in the molecule, the proportion of which influences the properties of the PVA, in particular its solubility.
- One form of definition of PVAs is therefore based on the indication of the ester number (E.N. ) , which is inversely proportional to the degree of hydrolysis.
- the E.N. is measured in a way known per se, by neutralization of any acid present in the poly (vinyl alcohol) , saponification of the acyl groups and titration of the excess from alkaline saponification.
- the poly (vinyl alcohol) s are also characterized by their degree of condensation, which can be evaluated by the determination of the dynamic viscosity of a typical solution (denoted by hdt in the present account) , it being known that this variable increases as the degree of condensation increases.
- the viscosity hdt corresponds to the dynamic viscosity coefficient of a 4 weight %aqueous PVA solution measured at a temperature of 20 ⁇ 5°C. using an Ostwald viscometer.
- the poly (vinyl acetate) s are conventional PVAs which can be used in the invention.
- the silicone emulsion according to the invention may comprise an antibacterial and/or an antiseptic agent E.
- suitable antibacterial and/or antiseptic agents E may be para-oxybenzoic acid alkyl ester, benzoic acid, sodium benzoate, sorbic acid, a potassium sorbate, phenoxy ethanol, salicylic acid, carbolic acid, sorbic acid, hexachlorophene, benzalkonium chloride, chlorhexidine chloride, trichlorocarbanilide, or phenoxyethanol.
- the amount of the antibacterial and/or antiseptic agent E in the silicone emulsion may be 0 to 0.05%by weight, preferably 0.01 to 0.04%by weight, and more preferably 0.02 to 0.03%by weight, with respect to the total weight of the silicone emulsion.
- the silicone emulsion according to the invention may comprise the crosslinking inhibitor G, which is commonly used in addition crosslinking silicone composition to slow the curing of the composition at ambient temperature.
- the crosslinking inhibitor G may be selected from the following compounds:
- R is H or a linear or branched alkyl radical, or a phenyl radical; the radicals R’ and R” and the carbon atom ⁇ to the triple bond possibly forming a ring.
- the total number of carbon atoms contained in R’ and R” being at least 5 and preferably from 9 to 20.
- examples that may be mentioned include:
- composition of silicone emulsion E is as below:
- Comparative example C-5 The pulp molded box P is used as the substrate for coating. A certain amount of the acrylic emulsion TOPSCREEN TC 612CN is weighted and diluted with water to obtain a diluted emulsion with a solid content of about 40%. The diluted emulsion is applied on the inner wall of the pulp molded box in a coating amount on the basis of dry weight of 15g/m 2 by using the spraying equipment. The coated pulp molded box is dried in an oven at 130°C and then is cooled down naturally.
- Comparative example C-7 The pulp molded box P is used as the substrate for coating. A certain amount of the acrylic emulsion TOPSCREEN TC 612CN is weighted and diluted with water to obtain a diluted emulsion with a solid content of about 40%. The diluted emulsion is applied on the inner wall of the pulp molded box in a coating amount on the basis of dry weight of 30g/m 2 by using the spraying equipment. The coated pulp molded box is dried in an oven at 130°C and then is cooled down naturally.
- Comparative example C-10 The pulp molded box P is used as the substrate for coating. A certain amount of silicone emulsion E is weighted and then is applied on the inner wall of the pulp molded box in a coating amount on the basis of dry weight of 30g/m 2 by using the spraying equipment. The coated pulp molded box is dried in an oven at 130°C and then is cooled down naturally.
- Example 3 The pulp molded box P is used as the substrate for coating.
- a certain amount of the acrylic emulsion NeoCryl A-2092 is weighted and diluted with water to obtain a diluted emulsion with a solid content of about 40%.
- the diluted emulsion is applied on the inner wall of the pulp molded box in a coating amount on the basis of dry weight of 10g/m 2 by using the spraying equipment to form an acrylic pre-coat.
- the coated pulp molded box is dried in an oven at 130°C and then is cooled down naturally.
- a certain amount of the silicone emulsion E is weighted and then is applied on the acrylic pre-coat in a coating amount on the basis of dry weight of 15g/m 2 by using the spraying equipment.
- the coated pulp molded box is dried in an oven at 130°C and then is cooled down naturally.
- Example 10 The pulp molded box P is used as the substrate for coating.
- a certain amount of the acrylic emulsion TOPSCREEN TC 612CN is weighted and diluted with water to obtain a diluted emulsion with a solid content of about 40%.
- the diluted emulsion is applied on the inner wall of the pulp molded box in a coating amount on the basis of dry weight of 15g/m 2 by using the spraying equipment to form an acrylic pre- coat.
- the coated pulp molded box is dried in an oven at 130°C and then is cooled down naturally.
- a certain amount of the silicone emulsion E is weighted and then is applied on the acrylic pre-coat in a coating amount on the basis of dry weight of 5g/m 2 by using the spraying equipment.
- the coated pulp molded box is dried in an oven at 130°C and then is cooled down naturally.
- Example 12 The pulp molded box P is used as the substrate for coating.
- a certain amount of the acrylic emulsion TOPSCREEN TC 612CN is weighted and diluted with water to obtain a diluted emulsion with a solid content of about 40%.
- the diluted emulsion is applied on the inner wall of the pulp molded box in a coating amount on the basis of dry weight of 15g/m 2 by using the spraying equipment to form an acrylic pre-coat.
- the coated pulp molded box is dried in an oven at 130°C and then is cooled down naturally.
- a certain amount of the silicone emulsion E is weighted and then is applied on the acrylic pre-coat in a coating amount on the basis of dry weight of 15g/m 2 by using the spraying equipment.
- the coated pulp molded box is dried in an oven at 130°C and then is cooled down naturally.
- Table 1-A shows the natures of the coat layers and their amounts in the Comparative Examples C-1 to C-10.
- Table 1-B shows the natures of the coat layers and their amounts in the Examples 1 to 12.
- Oil resistance property (Kit value) is measured by using Kit test according to Test Method TAPPI T 559 cm-02.
- ⁇ Test procedure comprises the steps of:
- Cobb value Water resistance property
- ⁇ Test procedure comprises the steps of:
- the conditioned weight of the specimen is subtracted from its final weight, and the gain in weight in grams is multiplied by 100 to obtain the weight of water absorbed in grams per square meter:
- Weight of water, g/m 2 (Final weight, g-Conditioned weight, g) *100
- ⁇ Test procedure comprises the steps of:
- Each of the samples used in this test is prepared by oven-drying the coated pulp molded box obtained according to each of the ways as shown in Table 1-A and Table 1-B, cutting the oven-dried material into pieces of about 2 cm x 2 cm with a guillotine-type cutter, and weighing the required test quantity of 50 ⁇ 1g of the oven-dried material so as to obtain the test material.
- test material is disintegrated in a procedure according to DIN EN ISO 5263.
- test material is added into tap water at 40°C to obtain a total volume of 2,000 ml, which is defibrated in a standard disintegrator without prior swelling at a consistency of 2.5%in which the disintegration time is 20 minutes and the speed is 3,000 rpm.
- Total reject This percentage is the total of the percentage of the reject from Brecht-Holl fractionation.
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Abstract
The invention generally relates to the field of food packaging, and particularly to a paper-based food container, especially a paper-based self-heating food container, having a coating system comprising an acrylic pre-coat and a silicone top-coat, which shows excellent performances in terms of oil resistance property, water resistance property, high temperature water vapor barrier property, structure strength and also has a high recyclable percentage and thus has excellent recyclability and is environmentally friendly.
Description
The invention generally relates to the field of food packaging, and particularly to a paper-based food container, especially a paper-based self-heating food container, having a coating system comprising an acrylic pre-coat and a silicone top-coat, which shows excellent performances in terms of oil resistance property, water resistance property, high temperature water vapor barrier property, structure strength and also has a high recyclable percentage and thus has excellent recyclability and is environmentally friendly.
Background Art
Various instant foods, especially self-heating foods such as self-heating rice or noodles, etc., are attracting more and more market attention because they are convenient, easy to carry, lightweight, safe, and rich in variety. At present, most of the self-heating food containers on the market are made of plastic materials such as polyethylene (PE) and polypropylene (PP) , or are made of paper-based materials but coated on its surface with plastic film such as polyethylene film. For example, CN207312258U discloses a self-heating hot pot made of a food-grade plastic material. However, plastic materials such as PE and PP are generally difficult to degrade, resulting in serious environmental problems. Further, in some applications, PE film cannot effectively block the leakage of high-temperature water vapor. Furthermore, recycling of a food container comprising plastic materials such as polyethylene films is limited and costly because specific equipment may be required for repulping. Due to white pollution caused by plastic materials, it is urgent to find a biodegradable and environmentally friendly packaging material to replace plastic materials, so as to meet the increasingly strengthened requirement of replacing plastic with paper.
A paper-based material is biodegradable and environmentally friendly, which, as a substitute for plastic, is widely used in the preparation of various food packaging and disposable food containers. However, because fibers in paper-based materials have hydrophilic and lipophilic characteristics, untreated paper-based materials are usually difficult to prevent water penetration and oil leakage in food and thus are unfavorable for food packaging and storage. In order to overcome these problems, the current practice is to add various additives such as water repellents and oil repellents into the pulp in the preparation of the paper for food, or to apply a coating on the paper for food, so as to achieve water resistance and oil resistance properties. However, these properties are not enough especially for a self-heating food container.
Accordingly, there is a continuing need for a paper-based food container, especially a paper-based self-heating food container having not only excellent water resistance and oil resistance, but also excellent other properties such as high temperature water vapor barrier property, structure strength and recyclability.
Contents of the Invention
An object of the invention is to provide a paper-based food container, especially a paper-based self-heating food container, having a coating system comprising an acrylic pre-coat and a silicone top-coat, which has excellent performances in one or more of the following properties, preferably in all of the following properties: water resistance, oil resistance, high temperature water vapor barrier property, structure strength and recyclability. Another object of the invention is to provide a paper-based food container, especially a paper-based self-heating food container, which is a green and environmentally friendly product and the materials used are harmless to the human body, non-toxic, tasteless, and readily degradable. Further object of the invention is to provide a paper-based food container, especially a paper-based self-heating food container, in which the production, the use and the destruction process thereof are pollution-free. Another further object of the invention is to provide a paper-based food container, especially a paper-based self-heating food container, which fully meets the food hygiene requirements. Another object of the invention is to provide a paper-based food container, especially a paper-based self-heating food container, which is recyclable and/or readily to be repulped after being used. Another further object of the invention is to provide a paper-based food container, especially a paper-based self-heating food container, which has a coating system having a relatively low total dry coat weight. Another object of the invention is to provide a paper-based food container, especially a paper-based self-heating food container, which has a transparent coating system. Another further object of the invention is to provide a paper-based food container, especially a paper-based self-heating food container, which has excellent high temperature resistance.
These objects, among others, are achieved by the invention which, in one aspect, relates to a paper-based food container, preferably a paper-based self-heating food container, wherein the paper-based food container has been coated with a coating system comprising or preferably consisting of:
- an acrylic pre-coat; and
- a silicone top-coat.
According to an embodiment of the invention, the coating system is applied on all of the surface or on at least part of the surface of the food container, for example, on all of the inner surface and/or outer surface or on at least part of the inner surface and/or outer surface of the food container, preferably on all of the inner surface or on at least part of the inner surface of the food container.
According to an embodiment of the invention, the food container is a self-heating food container including a part for containing the food and a part for heating the food, wherein the coating system is applied on all of the surface or on at least part of the surface of the self-heating food container, for example, on all of the inner surface and/or outer surface or on at least part of the inner surface and/or outer surface of the self-heating food container, especially, at least on all of or at least part of the inner surface of the bottom of said part for heating the food.
According to an embodiment of the invention, the acrylic pre-coat is formed by applying an acrylic emulsion on a surface of the food container, for example by spraying, and wherein preferably, the acrylic emulsion is prepared from a raw material comprising one or more acrylic monomers and optionally one or more other monomers, wherein the acrylic monomer is preferably selected from the group consisting of methyl acrylate, ethyl acrylate, 2-hydroxyethyl acrylate, propyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, cyclohexyl acrylate, methyl methacrylate, ethyl methacrylate, hydroxyethyl methacrylate, propyl methacrylate, n-butyl methacrylate, cyclohexyl methacrylate, isobutyl methacrylate, methacrylic acid, and a combination thereof, and/or wherein the one or more other monomers is preferably selected from the group consisting of styrene monomer, acrylonitrile monomer and a combination thereof.
According to an embodiment of the invention, the acrylic emulsion is styrene acrylic copolymer emulsion, for example, NeoCryl A-2092 from COVESTRO or TOPSCREEN TC 612CN from Solenis.
According to an embodiment of the invention, the silicone top-coat is formed by applying a silicone emulsion on the acrylic pre-coat, for example by spraying, and wherein preferably, the silicone emulsion comprises:
(A) at least one polyorganosiloxane A comprising, per molecule, at least two C
2-C
6 alkenyl radicals bonded to silicon atoms,
(B) at least one polyorganohydrogenosiloxane B comprising, per molecule, at least two hydrogen atoms bonded to an identical or different silicon atom,
(C) at least one catalyst C selected from the group consisting of platinum group metal or compound,
(D) at least one emulsifying agent D, preferably selected from surfactants and/or protective colloids, and more preferably from poly (vinyl alcohol) s (PVAs) ;
(E) optionally, at least one antibacterial and/or antiseptic agent E; and
(F) water F.
According to an embodiment of the invention, the silicone emulsion comprises:
- 15 to 60%by weight, preferably 25 to 50%by weight, and more preferably 30 to 40%by weight of the at least one polyorganosiloxane A,
- 3 to 20%by weight, preferably 5 to 15%by weight, and more preferably 6 to 10%by weight of the at least one polyorganohydrogenosiloxane B,
- 1 to 200 ppm by weight, preferably 2 to 100 ppm by weight, and more preferably 3 to 50 ppm by weight of the at least one catalyst C, calculated based on the amount of platinum group metal,
- 5 to 30%by weight, preferably 10 to 25%by weight, and more preferably 15 to 23%by weight of the at least one emulsifying agent D,
- 0 to 0.05%by weight, preferably 0.01 to 0.04%by weight, and more preferably 0.02 to 0.03%by weight of the at least one antibacterial and/or antiseptic agent E, and
-20 to 70%by weight, preferably 25 to 60%by weight, and more preferably 30 to 50%by weight of the water F, with respect to the total weight of the silicone emulsion.
According to an embodiment of the invention, the pre-coat amount on the basis of dry weight of the acrylic emulsion is from 2 to 40g/m
2, or from 3 to 30g/m
2, or from 5 to 20g/m
2, or from 10 to 15g/m
2, and/or the top-coat amount on the basis of dry weight of the silicone emulsion is from 1 to 40g/m
2, or from 2 to 30g/m
2, or from 3 to 25g/m
2, or from 5 to 20g/m
2, or from 10 to 15g/m
2, and/or the total coating amount on the basis of dry weight of the acrylic emulsion and the silicone emulsion is from 3 to 60g/m
2, or from 5 to 50g/m
2, or from 10 to 40g/m
2, or from 15 to 30g/m
2, or from 20 to 25g/m
2.
According to an embodiment of the invention, the food container contains an edible substance, preferably in solid or liquid state, for example, an instant food, especially a self-heating instant food, or beverages such as coffee, tea or water.
According to an embodiment of the invention, the food container is selected from the group consisting of a self-heating hot pot, a self-heating lunch box, a self-heating beverage cup such as water cup.
According to an embodiment of the invention, the food container is a pulp molded food container, preferably a self-heating pulp molded food container, such as a self-heating pulp molded hot pot, a self-heating pulp molded lunch box, a self-heating pulp molded beverage cup such as water cup.
In another aspect, the invention relates to a method for preparing a paper-based food container, preferably a paper-based self-heating food container according to the invention, comprising:
- providing a raw paper-based food container;
- applying an acrylic emulsion on a surface of the food container, preferably by spraying, so as to form an acrylic pre-coat;
- drying the acrylic pre-coat;
- applying a silicone emulsion on the acrylic pre-coat, preferably by spraying, so as to form a silicone top-coat; and
- curing the silicone top-coat, for example by heating at the temperature of 60℃-160℃, or 80℃-130℃, to obtain the food container having the coating system according to the invention.
In further another aspect, the invention relates to use of a coating system in a paper-based food container, preferably a paper-based self-heating food container, especially for improving one or more of, preferably all of water resistance, oil resistance, high temperature water vapor barrier property, structure strength and recyclability, said coating system comprises or preferably consists of:
- an acrylic pre-coat; and
- a silicone top-coat;
wherein the coating system is preferably defined according to the invention.
In another aspect, the invention relates to a paper-based substrate coated with a coating system, preferably used for manufacturing a food container, especially a self-heating food container, said coating system comprises or preferably consists of:
- an acrylic pre-coat; and
- a silicone top-coat,
wherein the coating system is preferably defined according to the invention.
In further another aspect, the invention relates a coating system comprising or preferably consisting of:
- an acrylic pre-coat; and
- a silicone top-coat,
wherein the coating system is preferably defined according to the invention.
To achieve these objects, the applicant demonstrated, to its credit, entirely surprisingly and unexpectedly, that the use of the coating system combining an acrylic pre-coat and a silicone top-coat in a paper-based food container makes it possible to overcome the problems of the existing paper-based food containers in the art. Without wishing to be bound by any theory, it would appear that since the food container of the invention has excellent water resistance and oil resistance, moisture and oil especially derived from food do not impregnate the food container, and it is thus possible to prevent deterioration of container’s strength resulting from impregnation with water and oil and prevent staining of the table surface or the like facing the bottom surface of the container with moisture and oil permeated through the container. Further, the food container of the invention has excellent high temperature water vapor barrier property and unlikely allows gas and high temperature water vapor to permeate, and, thus, when self-heating is involved for example, it is possible to prevent the problem that gas and high temperature water vapor especially derived from food and/or from heating medium permeate through the container and leak to the outside and, in particular, condense on the table surface or the like facing the bottom surface of the container. Furthermore, the food container of the invention, even with the coating system, has good performance in terms of recyclability such as repulpability.
High temperature water vapor barrier property is well known to a person skilled in the art. In particular when the self-heating application is involved, high temperature water vapor barrier property is used to evaluate whether a container is suitable for use as a self-heating container. In the invention, the measurement of the high temperature water vapor barrier property is described in the part of examples. Generally, the high temperature water vapor refers to the water vapor generated when water boils under ambient conditions. However, the self-heating in the context of the invention is not limited to heating at the boiling temperature. Self-heating temperature may be any temperature that can heat food. As a non-limiting example, the temperature may be greater than or equal to 45℃, such as greater than or equal to 50℃, such as greater than or equal to 60℃, such as greater than or equal to 80℃, such as greater than or equal to 90℃, such as greater than or equal to 100℃ or higher.
In the paper-based food container according to the invention, paper constitutes the substrate of the food container. Paper is typically a material in thin form obtained or derived from fibers of cellulose pulp from wood and other plant sources. Paper can contain additives and/or can be treated to improve its various properties such as resistance to various chemicals, harsh environments, and so on. Paper used in the present invention is of the grade useful in food related applications. In the invention, paper is usually available in the form of container or other packages for containing any edible substances.
According to a preferred embodiment, the paper-based food container according to the invention is a pulp molded product, which may be manufactured by a pulp molding method in which, for example, a slurry containing a pulp dispersed in an aqueous medium is used to form the product having a desired shape or a bulky pulp is compressed by molding to form the product having a desired shape in relatively dry condition. There are increasing demands for pulp molded products because, for example, the pulp as the main component is biodegradable, and the recycling of pulp molded products is relatively easy. However, pulp molded products are composed mainly of a pulp, and, therefore, for use as food containers, pulp molded products have disadvantages, for example, poor performances in terms of water resistance, oil resistance and high temperature water vapor property. The use of the coating system according to the invention imparts the pulp molded container with, for example, excellent water resistance and oil resistance, as well as excellent high temperature water vapor barrier property, high structure strength and recyclability, so that the pulp molded container having the coating system according to the invention can be used as a food container, especially a self-heating food container.
The solution according to the invention is not only beneficial to the environment, but also competitive with plastics in terms of performances and cost. By using the breakthrough technology, the invention allows to replace plastics with paper without compromising product performances, even with improved performances and providing a competitive cost within an ecologically responsible framework.
According to an embodiment, the pulp for preparing the food container contains at least 70%by weight of pulp fibers, preferably at least 80%by weight of pulp fibers, more preferably at least 90 by weight of pulp fibers and even more preferably at least 96%by weight of pulp fibers. The pulp optionally contains one or more additives for improving various properties of the pulp molded container, for example, a water repellent such as acrylic acid, alkyl ketene dimer (AKD) , etc., an oil repellent such as organic fluorine compound.
According to an embodiment, no fillers such as calcium carbonate and china clay etc. are added in the pulp.
For example, the amount of the acrylic acid water repellent in the pulp is 2 to 3%by weight, based on the total weight of the pulp. For example, the amount of the organic fluorine oil repellent in the pulp is in the range of 0.6 to 1.0%by weight, based on the total weight of the pulp.
According to an embodiment, the pulp fibers used in the invention may originate from a variety of wood types, including hardwood and softwood. Non-limiting examples of hardwood pulp fibers that can be used in the invention include, without limitation, oak, gum, maple, poplar, eucalyptus, aspen, birch, and others known to a person skilled in the art. Non-limiting examples of softwood pulp fibers that can be used in the invention include, without limitation, spruce, pine, fir, hemlock, southern pine, redwood, and others known to a person skilled in the art. The pulp fibers may also originate from non-wood fibers such as linen, cotton, bagasse, hemp, straw, kenaf, sugarcane, bamboo, etc. As an example, the pulp fiber may be selected from the group consisting of sugarcane pulp fiber, hardwood pulp fiber, bamboo pulp fiber, and so on. Preferably, the pulp fiber may include 70 to 90%by weight of sugarcane pulp fiber, 0 to 10%by weight of hardwood pulp fiber, and 10 to 20%by weight of bamboo pulp fiber, based on the total weight of the pulp fiber.
A person skilled in the art well knows how to adjust various components and corresponding amounts in the pulp according to actual needs.
The food container according to the invention may contain any edible substance preferably in solid or liquid state, for example, various instant foods, especially various self-heating instant foods, such as instant noodles, instant rice or instant hot pot foods, as well as various beverages, especially various self-heating beverages, such as coffee, tea or water.
Preferably, the food container of the invention can be a self-heating food container, such as a self-heating hot pot, a self-heating lunch box, a self-heating beverage cup such as water cup and the like. More preferably, the self-heating food container is a self-heating pulp molded food container, such as a self-heating pulp molded hot pot, a self-heating pulp molded lunch box, a self-heating pulp molded beverage cup such as water cup and the like.
The self-heating food container is well known in the art, and usually includes a part for containing the food to be heated and a part for heating the food, which may be arranged integrally or separately. Of course, other forms of self-heating containers may also be applicable to the invention.
According to an embodiment, self-heating is achieved usually by the heat generated from exothermic reaction of a heating agent in the heating pack when it meets water. For example, the heating pack may contain calcium oxide as main component, and may also contain other components if necessary, such as aluminum particles, sodium carbonate and so on. The water used for reacting with the heating agent can be any water that does not significantly interfere with the exothermic reaction, such as tap water, soft water, demineralized water, pure water.
According to another embodiment, the food container according to the invention may be a food container heated by other means, such as by microwave.
A person skilled in the art can determine which area (s) of the food container need (s) to be applied with the coating system of the invention according to actual needs such as intended use, cost, etc. According to an embodiment, the coating system of the invention may be applied on all of the surface or on at least part of the surface of the food container, for example, on all of the inner surface and/or outer surface or on at least part of the inner surface and/or outer surface of the food container.
According to a further embodiment, the food container is a self-heating food container including a part for containing the food and a part for heating the food, wherein the coating system is applied on all of the surface or on at least part of the surface of the self-heating food container, for example, on all of the inner surface and/or outer surface or on at least part of the inner surface and/or outer surface of the self-heating food container, especially, at least on all of or at least part of the inner surface of the bottom of said part for heating the food.
The coating system according to the invention can be applied to the food container by any suitable technology known in the art. For example, the coating system according to the invention can be deposited on the food container by transfer, by dip roll or by spraying, by a doctor blade, by a rotating frame or by a reverse roll. Preferably, the spraying technique is used.
According to an embodiment, the coating system is applied by taking the raw food container as a substrate, first coating the surface of the area to be coated of the food container with an acrylic emulsion to form an acrylic pre-coat, and then coating a silicone emulsion on the acrylic pre-coat to produce the food container having the coating system according to the invention.
Acrylic pre-coat:
An acrylic pre-coat refers to a layer formed on at least part of the surface of the food container by using an acrylic emulsion. The acrylic coat is a good film-forming layer, which can fill the depressions, pores, cracks and pinholes on the surface of the food container and seal the capillary pores of the paper.
The acrylic pre-coat is formed by using an acrylic emulsion. According to an embodiment, the acrylic emulsion is a food-grade acrylic emulsion. It is well known for a person skilled in the art to choose the constituents of the acrylic emulsion suitable for food purpose. Such a choice is within the capability of a person skilled in the art.
According to an embodiment, the acrylic emulsion is prepared from a raw material comprising one or more acrylic monomers and optionally one or more other monomers, wherein the acrylic monomer used here may broadly encompass acrylic monomer, for example acrylic acid and its derivatives, such as acrylate monomer; and methacrylic monomer for example, methacrylic acid and its derivatives, such as methacrylate monomer.
According an embodiment, the acrylic monomer may be selected from the group consisting of a C
1-C
12 alkyl acrylate or a C
1-C
12 alkyl methacrylate, in which the C
1-C
12 alkyl is, for example, linear or branched and may be selected from the group consisting of methyl, ethyl, n-propyl, 1-methyl-ethyl, n-butyl, 1-methyl-propyl, 2-methyl-propyl, 1, 1-dimethyl-ethyl, n-pentyl, 1-methyl-butyl, 3-methyl-butyl, n-hexyl, 1-methyl-pentyl, 2-methyl-pentyl, 4-methyl-pentyl, 2-ethyl-butyl, n-heptyl, 1-methyl-hexyl, n-octyl, 1-methyl-heptyl, 2-ethyl-hexyl, 5, 5-dimethyl-hexyl, 1, 1, 3, 3-tetramethyl-butyl, n-nonyl, 2-ethyl-heptyl, n-decyl, undecyl or n-dodecyl. A mixture of acrylic monomers is also suitable.
According to a preferred embodiment, the acrylic monomer is selected from the group consisting of methyl acrylate, ethyl acrylate, 2-hydroxyethyl acrylate, propyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, cyclohexyl acrylate, methyl methacrylate, ethyl methacrylate, hydroxyethyl methacrylate, propyl methacrylate, n-butyl methacrylate, cyclohexyl methacrylate, isobutyl methacrylate, methacrylic acid, and a combination thereof. Preferably, the acrylic monomer is selected from any combination of butyl acrylate, methyl methacrylate, hydroxyethyl methacrylate, and methacrylic acid, butyl acrylate or styrene butyl acrylate.
According to another embodiment, the one or more other monomers may be styrene monomer or acrylonitrile monomer.
The water used in the acrylic emulsion may be any water that does not contain any substance significantly interfering with emulsifying or the storage stability of the emulsion or the target use of the invention. The water can be selected from reverse osmosis water, deionized water, distilled water, well water, tap water, pure water, and so on.
The amount of water in the acrylic emulsion may be 20-70%by weight, preferably 25-60%by weight, and more preferably 30 to 50%by weight, with respect to the total weight of the acrylic emulsion.
The content of acrylic monomer is from 30%to 80%by weight, preferably 20%to 60%by weight, and more preferably 40%to 50%by weight, based on the dry weight of the emulsion.
The acrylic emulsion according to the invention may further comprise one or more additives according to actual needs, provided that these additives do not significantly interfere with or adversely affect the target use of the acrylic emulsion and are suitable for food purpose. For example, the additives are selected from a dispersing agent or an emulsifier, an antibacterial agent, an antiseptic agent, an antigelling agent, a wetting agent, an antifoam, an acidifying agent, a rheological agent, a filler, preferably an inorganic filler, selected from siliceous or non-siliceous materials, and the like.
According to an embodiment, the acrylic emulsion may contain flaky fillers such as talc, kaolin, etc., and the amount of the filler in the acrylic emulsion may be 1%to 30%by weight, preferably 10%to 20%by weight, relative to the total weight of the acrylic emulsion. The use of such fillers allows to improve water vapor resistance.
It is within the capability of a person skilled in the art to choose suitable additive (s) and the respective amount (s) .
The acrylic emulsion according to the invention can be prepared by any suitable method known in the art. For example, the acrylic emulsion of the invention can be prepared by mixing various constituents under stirring.
The obtained acrylic emulsion usually has translucent or off-white or milky white appearance.
According to an embodiment, the obtained acrylic emulsion has a pH value of 6.0 to 11.0, preferably 7.0 to 9.0.
According to an embodiment, the obtained acrylic emulsion has a viscosity of between 10 and 1000 mPa·s at 25℃, preferably of between 15 and 700 mPa·s at 25℃, and more preferably of between 20 and 150 mPa·s at 25℃ or between 200 and 650 mPa·s at 25℃.
Unless otherwise indicated, all the viscosities concerned with throughout the present document correspond to a so-called “Newtonian” dynamic viscosity quantity at 25℃, that is to say the dynamic viscosity which is measured, in a way known per se, at a shear rate gradient which is sufficiently low for the viscosity measured to be independent of the rate gradient. Generally, the viscosity is measured in a manner known per se, at 25℃ by using a Brookfield viscometer.
According to a preferred embodiment, the acrylic emulsion is styrene acrylic copolymer emulsion.
The acrylic emulsion may be commercially available. Commercial examples of the acrylic emulsion are, for example, NeoCryl A-2092 from COVESTRO; TOPSCREEN TC 612CN from Solenis.
The acrylic emulsion according to the invention may be applied to the substrate by any suitable technology known in the art to form an acrylic pre-coat. For example, the acrylic emulsion according to the invention may be deposited on the substrate by transfer, by dip roll or by spraying, by a doctor blade, by a rotating frame or by a reverse roll. Preferably, the spraying technique is used.
In the case of a food container according to the invention, the substrate refers to a raw food container, that is, a food container that has not been coated with the coating system according to the invention.
According to an embodiment, the acrylic emulsion may be coated on the substrate such as raw food container in a coating amount on the basis of dry weight of from 1 to 50g/m
2, or 2 to 40g/m
2, or from 3 to 30g/m
2, or from 5 to 20g/m
2, or from 10 to 15g/m
2, the amount varying depending on the desired thickness of the coat.
The acrylic pre-coat may be applied in the form of one or more layers, usually in the form of one layer.
According to an embodiment, the acrylic pre-coat is dried after it is applied to the substrate. For example, the drying can be carried out by heating, for example at the temperature of 60℃-160℃, or 80℃-130℃. The drying time may vary depending on the coating amount and drying temperature and so on, which can be easily determined by a person skilled in the art. For example, the drying time may be 10 seconds to 24 hours, such as 1 min to 12 hours, or 3 mins to 12 hours.
According to another embodiment, the coated acrylic layer may be cured via polymerizing by any suitable means known in the art.
The obtained acrylic pre-coat layer may have a thickness, for example, of 1μm to 50μm, or 3μm to 30μm, or 5μm to 20μm, or 6μm to 10μm.
Silicone top-coat:
The silicone top-coat is a cured silicone emulsion product.
The silicone top-coat is obtained by coating and curing a silicone emulsion on the acrylic pre-coat.
The silicone emulsion is a food-grade silicone emulsion. It is well known for a person skilled in the art to choose the constituents of the silicone emulsion suitable for food purpose. Such a choice is within the capability of a person skilled in the art.
An example of silicone emulsion suitable for the invention may be aqueous silicone emulsion systems comprising polyorganosiloxanes with SiH units and polyorganosiloxanes with Si-vinyl units. These systems conventionally polymerize by platinum group catalysis according to an SiH/SiVi polyaddition mechanism. In addition to the polyorganosiloxanes with SiH units, the polyorganosiloxanes with Si-vinyl units and the platinum group catalyst, these silicone emulsions may comprise one or more other constituents according to actual needs, provided that these constituents do not significantly interfere with or adversely affect the target use of the silicone emulsions.
According to an embodiment, the silicone emulsion suitable for the invention may comprises:
(A) at least one polyorganosiloxane A comprising, per molecule, at least two C
2-C
6 alkenyl radicals bonded to silicon atoms,
(B) at least one polyorganohydrogenosiloxane B comprising, per molecule, at least two hydrogen atoms bonded to an identical or different silicon atom,
(C) at least one catalyst C selected from the group consisting of platinum group metal or compound,
(D) at least one emulsifying agent D, preferably selected from surfactants and/or protective colloids, and more preferably from poly (vinyl alcohol) s (PVAs) ;
(E) optionally, at least one antibacterial and/or antiseptic agent E; and
(F) water F.
According to a particularly advantageous mode, the polyorganosiloxane A comprising, per molecule, at least two C
2-C
6 alkenyl radicals bonded to silicon atoms, comprises:
(i) at least two siloxyl units (A. 1) , which may be identical or different, having the following formula:
in which:
- a= 1 or 2, b= 0, 1 or 2 and a+b= 1, 2 or 3;
- W, which may be identical or different, represents C
2-C
6 alkenyl group, preferably vinyl or allyl group,
- Z, which may be identical or different, represents a monovalent hydrocarbon-based group containing from 1 to 30 carbon atoms, preferably selected from the group consisting of alkyl groups containing from 1 to 8 carbon atoms and aryl groups containing between 6 and 12 carbon atoms, and even more preferably selected from the group consisting of methyl, ethyl, propyl, 3, 3, 3-trifluoropropyl, xylyl, tolyl and phenyl radicals, and
(ii) optionally, at least one siloxyl unit having the following formula:
in which:
- a= 0, 1, 2 or 3,
- Z
1, which may be identical or different, represent a monovalent hydrocarbon-based group containing from 1 to 30 carbon atoms, preferably selected from the group consisting of alkyl groups containing from 1 to 8 carbon atoms and aryl groups containing between 6 and 12 carbon atoms, and even more preferably selected from the group consisting of methyl, ethyl, propyl, 3, 3, 3-trifluoropropyl, xylyl, tolyl and phenyl radicals.
Advantageously, Z and Z
1 are selected from the group consisting of methyl and phenyl radicals, and W is selected from the following list: vinyl, propenyl, 3-butenyl and 5-hexenyl, and preferably, W is a vinyl.
It is advantageous for this polyorganosiloxane A to have a viscosity of greater than or equal to 10 mPa·s at 25℃, such as between 20 and 300 mPa·s at 25℃, or greater than or equal to 1000 mPa·s at 25℃, or between 5000 and 200,000 mPa·s at 25℃.
The polyorganosiloxane A may be formed solely of units of formula (A. 1) or may additionally comprise units of formula (A. 2) . Likewise, it can exhibit a linear, branched, cyclic or network structure. Its degree of polymerization is preferably between 2 and 5000.
Examples of siloxyl units of formula (A. 1) are the vinyldimethylsiloxane unit, the vinylphenylmethylsiloxane unit and the vinylsiloxane unit.
Examples of siloxyl units of formula (A. 2) are the SiO
4/2, dimethylsiloxane, methylphenylsiloxane, diphenylsiloxane, methylsiloxane and phenylsiloxane units.
Examples of polyorganosiloxanes A are the dimethylpolysiloxanes with dimethylvinylsilyl ends, the methylvinyldimethylpolysiloxane copolymers with trimethylsilyl ends, the methylvinyldimethylpolysiloxane copolymers with dimethylvinylsilyl ends and cyclic methylvinylpolysiloxanes.
The amount of the polyorganosiloxanes A in the silicone emulsion may be 15 to 60%by weight, preferably 25 to 50%by weight, and more preferably 30 to 40%by weight, with respect to the total weight of the silicone emulsion.
The polyorganohydrogenosiloxane B is a polyorganosiloxane containing at least two hydrogen atoms per molecule, bonded to an identical or different silicon atom, and preferably containing at least three hydrogen atoms per molecule directly bonded to an identical or different silicon atom.
Advantageously, the polyorganohydrogenosiloxane B is a polyorganosiloxane comprising:
(i) at least two siloxyl units and preferably at least three siloxyl units having the following formula:
in which:
- d= 1 or 2, e = 0, 1 or 2 and d+e= 1, 2 or 3,
- Z
3, which may be identical or different, represents a monovalent hydrocarbon-based group containing from 1 to 30 carbon atoms, preferably selected from the group consisting of alkyl groups containing from 1 to 8 carbon atoms and aryl groups containing between 6 and 12 carbon atoms, and even more preferably selected from the group consisting of methyl, ethyl, propyl, 3, 3, 3-trifluoropropyl, xylyl, tolyl and phenyl radicals, and
(ii) optionally, at least one siloxyl unit having the following formula:
in which:
- c= 0, 1, 2 or 3,
- Z
2, which may be identical or different, represents a monovalent hydrocarbon-based group containing from 1 to 30 carbon atoms, preferably selected from the group consisting of alkyl groups containing from 1 to 8 carbon atoms and aryl groups containing between 6 and 12 carbon atoms, and even more preferably selected from the group consisting of methyl, ethyl, propyl, 3, 3, 3-trifluoropropyl, xylyl, tolyl and phenyl radicals.
It is advantageous for this polyorganohydrogenosiloxane B to have a viscosity of greater than or equal to 5 mPa·s at 25℃, preferably of greater than or equal to 10 mPa·s at 25℃ and more preferably of between 20 and 1000 mPa·s at 25℃.
The polyorganohydrogenosiloxane compound B may be formed solely from siloxyl units of formula (B. 1) or may also comprise units of formula (B. 2) . It may have a linear, branched or cyclic structure. The degree of polymerization is preferably greater than or equal to 2. More generally, it is less than 5000.
Examples of siloxyl units of formula (B. 1) are especially the following units: H (CH
3)
2SiO
1/2, HCH
3SiO
2/2 and H (C
6H
5) SiO
2/2.
The examples of units of formula (B. 2) may be the same as those given above for the units of formula (A. 2) .
Examples of polyorganosiloxane B are: dimethylpolysiloxanes bearing hydrogenodimethylsilyl end groups, dimethylhydrogenomethylpolysiloxanes bearing trimethylsilyl end groups, dimethylhydrogenomethylpolysiloxanes bearing hydrogenodimethylsilyl end groups, hydrogenomethylpolysiloxanes bearing trimethylsilyl end groups, and cyclic hydrogenomethylpolysiloxanes.
The amount of the polyorganosiloxane B in the silicone emulsion may be 3 to 20%by weight, preferably 5 to 15%by weight, and more preferably 6 to 10%by weight, with respect to the total weight of the silicone emulsion.
According to one particular embodiment, the amounts of the constituents A and B are such that in the silicone emulsion the [≡SiH] / [≡SiAlkenyl] mole ratio is between 0.5 and 7 and preferably between 1 and 5 with:
- [≡SiH] = total number of moles of siloxyl units comprising a hydrogen atom bonded to the silicon, and
- [≡SiAlkenyl] = total number of moles of siloxyl units comprising an alkenyl radical bonded to the silicon.
The catalyst C used in the invention is selected from the group consisting of platinum group metal or compound. The metals of the platinum group are those known under the name platinoids, this term combining, besides platinum, ruthenium, rhodium, palladium, osmium and iridium. Platinum and rhodium compounds are preferably used. Complexes of platinum and of an organic product described in patents US A 3 159 601, US A 3 159 602, US A 3 220 972 and European patents EP A 0 057 459, EP A 0 188 978 and EP A 0 190 530, and complexes of platinum and of vinylorganosiloxanes described in patents US A 3 419 593, US A 3 715 334, US A 3 377 432 and US A 3 814 730 may be used in particular. Specific examples are: platinum metal powder, chloroplatinic acid, a complex of chloroplatinic acid with β-diketone, a complex a chloroplatinic acid with olefin, a complex of a chloroplatinic acid with 1, 3-divinyltetramethyldisiloxane, a complex of silicone resin powder that contains aforementioned catalysts, a rhodium compound, such as those expressed by formulae: RhCl (Ph
3P)
3, RhCl
3 [S (C
4H
9)
2]
3, etc. ; tetrakis (triphenyl) palladium, a mixture of palladium black and triphenylphosphine, etc.
The catalyst ought preferably to be used in a catalytically sufficient amount, to allow sufficiently rapid crosslinking. Typically, 1 to 200 ppm by weight, preferably 2 to 100 ppm by weight, more preferably 3 to 50 ppm by weight of the catalyst are used, calculated based on the amount of platinum group metal, relative to the total silicone emulsion.
The catalyst may be included in the silicone emulsion together with other constituents, or may be packaged separately from other constituents in the silicone emulsion. In the latter case, the catalyst may be mixed with other constituents in the silicone emulsion just before the use.
As the emulsifying agent D, a surfactant may be used in the silicone emulsion according to the invention. Preferably, said surfactant is nonionic or ionic in nature.
The examples of the nonionic surfactants are, for example, alkylphenyls, fatty alcohols or fatty acids carrying alkylene oxide groups, for example ethylene or propylene oxide, e.g. : nonylphenyl comprising between 9 and 30 ethylene oxide (EO) groups or oleic acid with 2 to 8 EO.
The examples of the ionic surfactants, preferably anionic surfactants are, for example, sulphates, sulphonates, phosphates, sulphosuccinates, sulphosuccinamates, sulphoacetates or amino acid derivatives.
As regards the water-soluble emulsifying agents D of protective colloid type, it should be observed that, in addition to their emulsifying function, these protective colloids, such as PVAs, can also be active as promoters of anti-adhesiveness, of water repellency, indeed even of printability, as regards the field of paper anti-adhesiveness.
Poly (vinyl alcohol) s (PVAs) are compounds obtained indirectly from their esters by hydrolysis in aqueous medium or by alcoholysis in anhydrous medium. In practice, the esters used as starting material are commonly poly (vinyl acetate) s. The lysis of the esters resulting in the PVAs is generally incomplete. Acyl radicals remain in the molecule, the proportion of which influences the properties of the PVA, in particular its solubility. One form of definition of PVAs is therefore based on the indication of the ester number (E.N. ) , which is inversely proportional to the degree of hydrolysis. The E.N. is measured in a way known per se, by neutralization of any acid present in the poly (vinyl alcohol) , saponification of the acyl groups and titration of the excess from alkaline saponification.
The poly (vinyl alcohol) sare also characterized by their degree of condensation, which can be evaluated by the determination of the dynamic viscosity of a typical solution (denoted by hdt in the present account) , it being known that this variable increases as the degree of condensation increases. The viscosity hdt corresponds to the dynamic viscosity coefficient of a 4 weight %aqueous PVA solution measured at a temperature of 20±5℃. using an Ostwald viscometer.
Without these being limiting, examples may be given of poly (vinyl alcohol) swhich provide satisfactory results with respect to the objects targeted by the invention: these PVAs are those with an hdt of between 5 and 10 mPa·s and an E.N. of between 130 and 150.
The poly (vinyl acetate) sare conventional PVAs which can be used in the invention.
The amount of the emulsifying agent D in the silicone emulsion may be 5 to 30%by weight, preferably 10 to 25%by weight, and more preferably 15 to 23%by weight, with respect to the total weight of the silicone emulsion.
Further, the silicone emulsion according to the invention may comprise an antibacterial and/or an antiseptic agent E. For example, suitable antibacterial and/or antiseptic agents E may be para-oxybenzoic acid alkyl ester, benzoic acid, sodium benzoate, sorbic acid, a potassium sorbate, phenoxy ethanol, salicylic acid, carbolic acid, sorbic acid, hexachlorophene, benzalkonium chloride, chlorhexidine chloride, trichlorocarbanilide, or phenoxyethanol.
The amount of the antibacterial and/or antiseptic agent E in the silicone emulsion may be 0 to 0.05%by weight, preferably 0.01 to 0.04%by weight, and more preferably 0.02 to 0.03%by weight, with respect to the total weight of the silicone emulsion.
As for water F used for the silicone emulsion of the invention, it can be selected from any water that does not contain any substance significantly interfering with emulsifying or the storage stability of the emulsion or the target use of the invention. The water can be selected from reverse osmosis water, deionized water, distilled water, well water, tap water, pure water and so on.
The amount of water in the silicone emulsion may be 20 to 70%by weight, preferably 25 to 60%by weight, and more preferably 30 to 50%by weight, with respect to the total weight of the silicone emulsion.
The silicone emulsion according to the invention may comprise the crosslinking inhibitor G, which is commonly used in addition crosslinking silicone composition to slow the curing of the composition at ambient temperature. The crosslinking inhibitor G may be selected from the following compounds:
- acetylenic alcohols;
- polyorganosiloxanes, advantageously in cyclic form, which are substituted with at least one alkenyl, tetramethylvinyltetrasiloxane being particularly preferred;
- pyridine;
- organic phosphines and phosphites;
- unsaturated amides, and
- alkyl and allyl maleates.
These acetylenic alcohols (Cf. FR-B-1 528 464 and FR-A-2 372 874) , which are among the preferred hydrosilylation-reaction thermal blockers, have the formula:
(R’) (R”) (OH) C-C≡CH
in which:
- R’ is a linear or branched alkyl radical, or a phenyl radical; and
- R” is H or a linear or branched alkyl radical, or a phenyl radical; the radicals R’ and R” and the carbon atom α to the triple bond possibly forming a ring.
The total number of carbon atoms contained in R’ and R” being at least 5 and preferably from 9 to 20. For the said acetylenic alcohols, examples that may be mentioned include:
· 1-ethynyl-1-cyclohexanol;
· 3-methyl-1-dodecyn-3-ol;
· 3, 7, 11-trimethyl-1-dodecyn-3-ol;
· 1, 1-diphenyl-2-propyn-1-ol;
· 3-ethyl-6-ethyl-1-nonyn-3-ol;
· 2-methyl-3-butyn-2-ol;
· 3-methyl-1-pentadecyn-3-ol.
These α-acetylenic alcohols may be commercial products.
Such crosslinking inhibitor G is present in a proportion of 3000 ppm at most, preferably in a proportion of 100 to 2000 ppm, with respect to the total weight of the polyorganosiloxanes A and B.
The silicone emulsion according to the invention may further comprise one or more other additives according to actual needs, provided that these additives do not significantly interfere with or adversely affect the target use of the silicone emulsion and are suitable for food purpose. For example, the other additives are selected from a dispersing agent, an antigelling agent, a wetting agent, an antifoam, an acidifying agent, a rheological agent, a filler, preferably an inorganic filler, selected from siliceous or non-siliceous materials, and the like.
It is within the capability of a person skilled in the art to choose suitable additive (s) and the respective amount (s) .
The silicone emulsion according to the invention can be prepared by any suitable method known in the art. For example, the silicone emulsion of the invention can be prepared by mixing various constituents under stirring.
The obtained silicone emulsion usually has a white appearance, and the solid content may be 20-60%by weight, preferably 30-50%by weight, more preferably 40-45%by weight, with respect to the total weight of the silicone emulsion.
According to an embodiment, the obtained silicone emulsion has a pH value of 3.0 to 6.0, preferably 4.0 to 5.0.
According to an embodiment, the obtained silicone emulsion has a viscosity of between 10 and 1000 mPa·s at 25℃, preferably of between 15 and 500 mPa·s at 25℃, and more preferably of between 20 and 300 mPa·s at 25℃.
The silicone top-coat may be formed by applying the silicone emulsion according to the invention on the acrylic pre-coat by any suitable technology known in the art. For example, the silicone composition according to the invention can be deposited on the acrylic pre-coat by transfer, by dip roll or by spraying, by a doctor blade, by a rotating frame or by a reverse roll. Preferably, the spraying technique is used.
According to an embodiment, the silicone emulsion may be coated in a coating amount on the basis of dry weight of from 1 to 40g/m
2, or from 2 to 30g/m
2, or from 3 to 25g/m
2, or from 4 to 20g/m
2, or from 5 to 20g/m
2, or from 10 to 15g/m
2, the amount varying depending on the desired thickness of the coat.
According to an embodiment, the silicone top-coat is dried after it is applied to the acrylic pre-coat. Curing may occur during the drying.
The coated silicone layer may be cured via crosslinking by any suitable means known in the art. For example, the curing can be carried out by heating, for example at the temperature of 60℃-160℃, or 80℃-130℃. The curing time may vary depending on the coating amount and curing temperature and so on, which can be easily determined by a person skilled in the art. For example, the curing time may be 10 seconds to 24 hours, such as 1 min to 12 hours, or 3 mins to 12 hours.
The obtained silicone top-coat layer may have a thickness, for example, of 1μm to 30μm, or 2μm to 25μm, or 3μm to 20μm, or 4μm to 10μm.
According to an embodiment, the paper-based substrate may include one or more additional coating layers used to provide the final product with various coating properties.
Mode of Carrying Out the Invention
The invention will now be described by means of the examples that follow, which are, needless to say, given as nonlimiting illustrations of the invention. Unless otherwise specified, the amount involved in the invention is the one by weight.
Examples
I. The materials and equipment used in the examples are listed as follows:
- Pulp molded box P:
Firstpack pulp molded box: Size: 186mm*158mm*110.6mm, from FIRSTPACK Co. Ltd., China.
- Acrylic emulsion A: NeoCryl A-2092 from COVESTRO,
Appearance: milky white liquid, Solid content: 46-48%, pH: 8.0-8.6, viscosity at 25℃: 250-650 mPa. s.
- Acrylic emulsion B: TOPSCREEN TC 612CN from Solenis,
Appearance: off-white emulsion, Solid content: 50%, pH: 8.0-8.6, viscosity at 25℃: 25-100 mPa. s.
- Silicone emulsion E:
Appearance: white emulsion, Solid content: 41%, pH: 4.0, viscosity at 25℃: 20-300 mPa.s.
The composition of silicone emulsion E is as below:
- Self-heating pack:
Heating pack: 50g/piece, containing 60%by weight of calcium oxide as main component, 25%by weight of aluminium and 15%by weight of sodium carbonate.
- Spraying equipment:
Autojet, Type: ORD31018, from Spraying Systems Co., Ltd.
II. Examples:
Comparative example C-1: A commercial pulp molded lunch box (Firstpack self-heating rice porridge) is used as a comparative example. Its inner walls have been covered with 30g/m
2 PLA film.
Comparative example C-2: The pulp molded box P is used as the substrate for coating. A certain amount of the acrylic emulsion NeoCryl A-2092 is weighted and diluted with water to obtain a diluted emulsion with a solid content of about 40%. The diluted emulsion is applied on the inner wall of the pulp molded box in a coating amount on the basis of dry weight of 15g/m
2 by using the spraying equipment. The coated pulp molded box is dried in an oven at 130℃ and then is cooled down naturally.
Comparative example C-3: The pulp molded box P is used as the substrate for coating. A certain amount of the acrylic emulsion NeoCryl A-2092 is weighted and diluted with water to obtain a diluted emulsion with a solid content of about 40%. The diluted emulsion is applied on the inner wall of the pulp molded box in a coating amount on the basis of dry weight of 20g/m
2 by using the spraying equipment. The coated pulp molded box is dried in an oven at 130℃ and then is cooled down naturally.
Comparative example C-4: The pulp molded box P is used as the substrate for coating. A certain amount of the acrylic emulsion NeoCryl A-2092 is weighted and diluted with water to obtain a diluted emulsion with a solid content of about 40%. The diluted emulsion is applied on the inner wall of the pulp molded box in a coating amount on the basis of dry weight of 30g/m
2 by using the spraying equipment. The coated pulp molded box is dried in an oven at 130℃ and then is cooled down naturally.
Comparative example C-5: The pulp molded box P is used as the substrate for coating. A certain amount of the acrylic emulsion TOPSCREEN TC 612CN is weighted and diluted with water to obtain a diluted emulsion with a solid content of about 40%. The diluted emulsion is applied on the inner wall of the pulp molded box in a coating amount on the basis of dry weight of 15g/m
2 by using the spraying equipment. The coated pulp molded box is dried in an oven at 130℃ and then is cooled down naturally.
Comparative example C-6: The pulp molded box P is used as the substrate for coating. A certain amount of the acrylic emulsion TOPSCREEN TC 612CN is weighted and diluted with water to obtain a diluted emulsion with a solid content of about 40%. The diluted emulsion is applied on the inner wall of the pulp molded box in a coating amount on the basis of dry weight of 20g/m
2 by using the spraying equipment. The coated pulp molded box is dried in an oven at 130℃ and then is cooled down naturally.
Comparative example C-7: The pulp molded box P is used as the substrate for coating. A certain amount of the acrylic emulsion TOPSCREEN TC 612CN is weighted and diluted with water to obtain a diluted emulsion with a solid content of about 40%. The diluted emulsion is applied on the inner wall of the pulp molded box in a coating amount on the basis of dry weight of 30g/m
2 by using the spraying equipment. The coated pulp molded box is dried in an oven at 130℃ and then is cooled down naturally.
Comparative example C-8: The pulp molded box P is used as the substrate for coating. A certain amount of the silicone emulsion E is weighted and then is applied on the inner wall of the pulp molded box in a coating amount on the basis of dry weight of 15g/m
2 by using the spraying equipment. The coated pulp molded box is dried in an oven at 130℃and then is cooled down naturally.
Comparative example C-9: The pulp molded box P is used as the substrate for coating. A certain amount of the silicone emulsion E is weighted and then is applied on the inner wall of the pulp molded box in a coating amount on the basis of dry weight of 20g/m
2 by using the spraying equipment. The coated pulp molded box is dried in an oven at 130℃and then is cooled down naturally.
Comparative example C-10: The pulp molded box P is used as the substrate for coating. A certain amount of silicone emulsion E is weighted and then is applied on the inner wall of the pulp molded box in a coating amount on the basis of dry weight of 30g/m
2 by using the spraying equipment. The coated pulp molded box is dried in an oven at 130℃ and then is cooled down naturally.
Example 1: The pulp molded box P is used as the substrate for coating. A certain amount of the acrylic emulsion NeoCryl A-2092 is weighted and diluted with water to obtain a diluted emulsion with a solid content of about 40%. The diluted emulsion is applied on the inner wall of the pulp molded box in a coating amount on the basis of dry weight of 10g/m
2 by using the spraying equipment to form an acrylic pre-coat. The coated pulp molded box is dried in an oven at 130℃ and then is cooled down naturally. A certain amount of the silicone emulsion E is weighted and then is applied on the acrylic pre-coat in a coating amount on the basis of dry weight of 5g/m
2 by using the spraying equipment. The coated pulp molded box is dried in an oven at 130℃ and then is cooled down naturally.
Example 2: The pulp molded box P is used as the substrate for coating. A certain amount of the acrylic emulsion NeoCryl A-2092 is weighted and diluted with water to obtain a diluted emulsion with a solid content of about 40%. The diluted emulsion is applied on the inner wall of the pulp molded box in a coating amount on the basis of dry weight of 10g/m
2 by using the spraying equipment to form an acrylic pre-coat. The coated pulp molded box is dried in an oven at 130℃ and then is cooled down naturally. A certain amount of the silicone emulsion E is weighted and then is applied on the acrylic pre-coat in a coating amount on the basis of dry weight of 10g/m
2 by using the spraying equipment. The coated pulp molded box is dried in an oven at 130℃ and then is cooled down naturally.
Example 3: The pulp molded box P is used as the substrate for coating. A certain amount of the acrylic emulsion NeoCryl A-2092 is weighted and diluted with water to obtain a diluted emulsion with a solid content of about 40%. The diluted emulsion is applied on the inner wall of the pulp molded box in a coating amount on the basis of dry weight of 10g/m
2 by using the spraying equipment to form an acrylic pre-coat. The coated pulp molded box is dried in an oven at 130℃ and then is cooled down naturally. A certain amount of the silicone emulsion E is weighted and then is applied on the acrylic pre-coat in a coating amount on the basis of dry weight of 15g/m
2 by using the spraying equipment. The coated pulp molded box is dried in an oven at 130℃ and then is cooled down naturally.
Example 4: The pulp molded box P is used as the substrate for coating. A certain amount of the acrylic emulsion NeoCryl A-2092 is weighted and diluted with water to obtain a diluted emulsion with a solid content of about 40%. The diluted emulsion is applied on the inner wall of the pulp molded box in a coating amount on the basis of dry weight of 15g/m
2 by using the spraying equipment to form an acrylic pre-coat. The coated pulp molded box is dried in an oven at 130℃ and then is cooled down naturally. A certain amount of the silicone emulsion E is weighted and then is applied on the acrylic pre-coat in a coating amount on the basis of dry weight of 5g/m
2 by using the spraying equipment. The coated pulp molded box is dried in an oven at 130℃ and then is cooled down naturally.
Example 5: The pulp molded box P is used as the substrate for coating. A certain amount of the acrylic emulsion NeoCryl A-2092 is weighted and diluted with water to obtain a diluted emulsion with a solid content of about 40%. The diluted emulsion is applied on the inner wall of the pulp molded box in a coating amount on the basis of dry weight of 15g/m
2 by using the spraying equipment to form an acrylic pre-coat. The coated pulp molded box is dried in an oven at 130℃ and then is cooled down naturally. A certain amount of the silicone emulsion E is weighted and then is applied on the acrylic pre-coat in a coating amount on the basis of dry weight of 10g/m
2 by using the spraying equipment. The coated pulp molded box is dried in an oven at 130℃ and then is cooled down naturally.
Example 6: The pulp molded box P is used as the substrate for coating. A certain amount of the acrylic emulsion NeoCryl A-2092 is weighted and diluted with water to obtain a diluted emulsion with a solid content of about 40%. The diluted emulsion is applied on the inner wall of the pulp molded box in a coating amount on the basis of dry weight of 15g/m
2 by using the spraying equipment to form an acrylic pre-coat. The coated pulp molded box is dried in an oven at 130℃ and then is cooled down naturally. A certain amount of the silicone emulsion E is weighted and then is applied on the acrylic pre-coat in a coating amount on the basis of dry weight of 15g/m
2 by using the spraying equipment. The coated pulp molded box is dried in an oven at 130℃ and then is cooled down naturally.
Example 7: The pulp molded box P is used as the substrate for coating. A certain amount of the acrylic emulsion TOPSCREEN TC 612CN is weighted and diluted with water to obtain a diluted emulsion with a solid content of about 40%. The diluted emulsion is applied on the inner wall of the pulp molded box in a coating amount on the basis of dry weight of 10g/m
2 by using the spraying equipment to form an acrylic pre-coat. The coated pulp molded box P is dried in an oven at 130℃ and then is cooled down naturally. A certain amount of the silicone emulsion E is weighted and then is applied on the acrylic pre-coat in a coating amount on the basis of dry weight of 5g/m
2 by using the spraying equipment. The coated pulp molded box is dried in an oven at 130℃ and then is cooled down naturally.
Example 8: The pulp molded box P is used as the substrate for coating. A certain amount of the acrylic emulsion TOPSCREEN TC 612CN is weighted and diluted with water to obtain a diluted emulsion with a solid content of about 40%. The diluted emulsion is applied on the inner wall of the pulp molded box in a coating amount on the basis of dry weight of 10g/m
2 by using the spraying equipment to form an acrylic pre-coat. The coated pulp molded box is dried in an oven at 130℃ and then is cooled down naturally. A certain amount of the silicone emulsion E is weighted and then is applied on the acrylic pre-coat in a coating amount on the basis of dry weight of 10g/m
2 by using the spraying equipment. The coated pulp molded box is dried in an oven at 130℃ and then is cooled down naturally.
Example 9: The pulp molded box P is used as the substrate for coating. A certain amount of the acrylic emulsion TOPSCREEN TC 612CN is weighted and diluted with water to obtain a diluted emulsion with a solid content of about 40%. The diluted emulsion is applied on the inner wall of the pulp molded box in a coating amount on the basis of dry weight of 10g/m
2 by using the spraying equipment to form an acrylic pre-coat. The coated pulp molded box is dried in an oven at 130℃ and then is cooled down naturally. A certain amount of the silicone emulsion E is weighted and then is applied on the acrylic pre-coat in a coating amount on the basis of dry weight of 15g/m
2 by using the spraying equipment. The coated pulp molded box is dried in an oven at 130℃ and then is cooled down naturally.
Example 10: The pulp molded box P is used as the substrate for coating. A certain amount of the acrylic emulsion TOPSCREEN TC 612CN is weighted and diluted with water to obtain a diluted emulsion with a solid content of about 40%. The diluted emulsion is applied on the inner wall of the pulp molded box in a coating amount on the basis of dry weight of 15g/m
2 by using the spraying equipment to form an acrylic pre- coat. The coated pulp molded box is dried in an oven at 130℃ and then is cooled down naturally. A certain amount of the silicone emulsion E is weighted and then is applied on the acrylic pre-coat in a coating amount on the basis of dry weight of 5g/m
2 by using the spraying equipment. The coated pulp molded box is dried in an oven at 130℃ and then is cooled down naturally.
Example 11: The pulp molded box P is used as the substrate for coating. A certain amount of the acrylic emulsion TOPSCREEN TC 612CN is weighted and diluted with water to obtain a diluted emulsion with a solid content of about 40%. The diluted emulsion is applied on the inner wall of the pulp molded box in a coating amount on the basis of dry weight of 15g/m
2 by using the spraying equipment to form an acrylic pre-coat. The coated pulp molded box is dried in an oven at 130℃ and then is cooled down naturally. A certain amount of the silicone emulsion E is weighted and then is applied on the acrylic pre-coat in a coating amount on the basis of dry weight of 10g/m
2 by using the spraying equipment. The coated pulp molded box is dried in an oven at 130℃ and then is cooled down naturally.
Example 12: The pulp molded box P is used as the substrate for coating. A certain amount of the acrylic emulsion TOPSCREEN TC 612CN is weighted and diluted with water to obtain a diluted emulsion with a solid content of about 40%. The diluted emulsion is applied on the inner wall of the pulp molded box in a coating amount on the basis of dry weight of 15g/m
2 by using the spraying equipment to form an acrylic pre-coat. The coated pulp molded box is dried in an oven at 130℃ and then is cooled down naturally. A certain amount of the silicone emulsion E is weighted and then is applied on the acrylic pre-coat in a coating amount on the basis of dry weight of 15g/m
2 by using the spraying equipment. The coated pulp molded box is dried in an oven at 130℃ and then is cooled down naturally.
Table 1-A shows the natures of the coat layers and their amounts in the Comparative Examples C-1 to C-10.
Table 1-A
Table 1-B shows the natures of the coat layers and their amounts in the Examples 1 to 12.
Table 1-B
III. Properties evaluation
Various properties of materials prepared according to the present Examples and the Comparative Examples are measured under the same conditions according to the following protocols.
Oil resistance property:
Oil resistance property (Kit value) is measured by using Kit test according to Test Method TAPPI T 559 cm-02.
· Test solutions used are indicated in the following table.
· Test procedure comprises the steps of:
(1) placing each of the coated pulped boxes obtained in the Examples and the Comparative Examples on a clean flat surface, with the side to be tested facing up;
(2) dropping on the test area from a height of about 2.5 cm a drop of test solution from an intermediate Kit number testing bottle;
(3) after exactly 15 seconds, removing the excess fluid with a clean swatch of cotton or tissue and immediately examining the wetted area;
(4) the test failed if there is evidenced of a pronounced darkening of the specimen caused by penetration under the drops, even in a small area;
(5) repeating the procedure as required, making sure that drops from other Kit number bottles fall in untouched areas.
· Expression of results
The highest test solution kit value that stands on the surface of the substrate for 15 seconds without penetration is reported.
The higher the Kit value, the better the oil resistance property.
Water resistance property
Water resistance property (Cobb value) is measured by using Cobb test according to TAPPI T441.
· Test procedure comprises the steps of:
(1) coating each 200 gsm paperboard as a specimen respectively according to each of the ways shown in Table 1-A and Table 1-B;
(2) paperboard specimens should be separated from each other and conditioned for at least 15 hours at a temperature of 23℃and a relative humidity of 50%
(3) placing the weighed paperboard specimen on the rubber mat, placing the metal ring on the paper and tightening the ring with the clamps;
(4) pouring 100 ml demineralised water at room temperature on the paper and checking for leaks; exposing the paper for 30 minutes to the water at room temperature;
(5) after 30 minutes, pouring the water out and removing the metal ring; dabbing the residual water carefully with a dry paper cloth;
(6) weighing immediately the exposed paperboard specimen and reporting the weight.
· Expression of results:
For the standard test area of 100cm
2, the conditioned weight of the specimen is subtracted from its final weight, and the gain in weight in grams is multiplied by 100 to obtain the weight of water absorbed in grams per square meter:
Weight of water, g/m
2= (Final weight, g-Conditioned weight, g) *100
The weights before and after exposure in grams are reported.
The Cobb value in g/m
2 is reported.
The lower the Cobb value, the better the water resistance property.
High temperature water vapor barrier property
High temperature water vapor barrier is especially used to evaluate whether the sample is suitable for self-heating containers.
· Test procedure comprises the steps of:
(1) placing each of the coated pulp molded boxes obtained in the Examples and the Comparative Examples on the dry desk and then putting the self-heating pack (50g/piece) into the coated pulp molded box;
(2) pouring about 210g water into the pulp molded box and covering it with a lid;
(3) the water will be boiled by the heating pack and massive water vapor is generated;
(4) picking up the pulp molded box and checking the leakage at the bottom of the box at 5 mins, 10 mins, 15 mins.
· Expression of the results
The results are scored as follows:
5-Dry at the bottom after 15 mins
4-Dry at the bottom at 10 mins, but a bit haze at 15 mins
3-Dry at the bottom at 5 mins, but a bit haze at 10 mins
2-Haze at the bottom at 5 mins, massive droplets observed after 10 mins
1-Massive water droplets observed at 5 mins
The results described as the scores from 1 to 5. The higher the score value, the better the high temperature water vapor barrier property.
Structure strength
Structure strength is visually determined after hot water test.
· Test procedure comprises the steps of:
(1) placing each of the pulp molded boxes obtained in the Examples and the Comparative Examples on the dry desk and then putting the self-heating pack (50g/piece) into the coated pulp molded box,
(2) pouring about 210g water into the pulp molded box and covering it with a lid;
(3) the water will be boiled by the heating pack and massive water vapor is generated;
(4) picking up the pulp molded box and checking the stiffness of its bottom.
· Expression of the results
The status of the bottom of the pulp molded box is visually checked and described as follows:
- Very soft
- Soft
- A bit soft
- Slightly soft
- Stiff.
The results described as “Very soft” is the most unacceptable, while the result described as “Stiff” is the best.
Test of recyclability
The analysis of recyclability is carried out in accordance with the PTS method PTS-RH 021: 2012 (Draft Oct 2019) ‘Identification of the recyclability of paper and board packages and of graphic print products’ .
Preparation of Samples
Each of the samples used in this test is prepared by oven-drying the coated pulp molded box obtained according to each of the ways as shown in Table 1-A and Table 1-B, cutting the oven-dried material into pieces of about 2 cm x 2 cm with a guillotine-type cutter, and weighing the required test quantity of 50±1g of the oven-dried material so as to obtain the test material.
Disintegration and homogenisation
The test material is disintegrated in a procedure according to DIN EN ISO 5263.
For this purpose, the test material is added into tap water at 40℃ to obtain a total volume of 2,000 ml, which is defibrated in a standard disintegrator without prior swelling at a consistency of 2.5%in which the disintegration time is 20 minutes and the speed is 3,000 rpm.
Then, the fiber suspension thus obtained is homogenized according to ZM V/6/61.
For this purpose, the obtained fiber suspension is transferred into a distributor, diluted with tap water to a consistency of 0.5%, and homogenized for about 5 minutes. In the following, the diluted stock to be used for further testing is referred to as ‘total stock’ .
Disintegratability
Disintegratability is tested according to the Zellcheming method ZM V/18/62.
For this purpose, the total stock is screened for 5 minutes without any further chemical additive by means of a Brecht-Holl fractionator using a perforated plate with a hole diameter of 0.7 mm. This is followed by a visual inspection and gravimetric determination of the reject on the perforated plate.
Fiber yield can be derived from the difference between the (oven-dry to 100%) initial material and the total reject.
Analysis Results of Total Reject and Fiber Yield
Total reject: This percentage is the total of the percentage of the reject from Brecht-Holl fractionation.
Recyclable percentage (Fiber yield) : This percentage is obtained by subtracting the mass of total reject from the mass of initial material and then being divided by the mass of initial material. It is based on the oven-dry total mass of the initial material.
Recyclable percentage (Fiber yield) of more than 80%is considered as recyclable.
The various properties of materials which are prepared through Examples and Comparative Examples are tested under the same conditions, and the results are shown in Table 2 and Table 3.
Table 2 shows oil resistance property, water resistance property, high temperature water vapor barrier property, structure strength and recyclable percentage of the pulp molded box obtained according to the Comparative Examples.
Table 2
Table 3 shows oil resistance property, water resistance property, high temperature water vapor barrier property, structure strength and recyclable percentage of the pulp molded box obtained according to the Examples of the invention.
Table 3
From the results shown in Table 2 and Table 3, it can be seen that the coated pulp molded boxes according to the present invention show excellent performances in terms of oil resistance property, water resistance property, high temperature water vapor barrier property and structure strength.
The coated pulp molded boxes according to the present invention also have high recyclable percentages, all more than 91.8%and thus can be considered as recyclable and environmentally friendly. In contrast, Comparative example C-1 in which PLA film is used has the recyclable percentage of only 67.8%and thus can be considered as not good for recycling.
As can be seen from the Comparative examples, the use of PLA film only, acrylic coat only or silicone coat only makes it impossible to achieve excellent performances in terms of oil resistance property, water resistance property, high temperature water vapor barrier property and structure strength. Insufficient high temperature water vapor barrier property is indicated, even with a high coating amount (for example, Comparative examples C-4 and C-7) .
Example 1 according to the invention only uses the total coat amount of 15g/m
2, but achieves the comprehensive performances comparable with those of the Comparative example C-10 which uses a silicone layer only but the coating amount is as high as 30g/m
2.
In conclusion, the products according to the present invention show best performances with less coating amounts compared with the products having coat of acrylic, silicone or PLA only and also show excellent recyclability, especially compared with PLA film laminated product.
Claims (17)
- A paper-based food container, preferably a paper-based self-heating food container, wherein the paper-based food container has been coated with a coating system comprising or preferably consisting of:- an acrylic pre-coat; and- a silicone top-coat.
- The paper-based food container according to claim 1, wherein the coating system is applied on all of the surface or on at least part of the surface of the food container, for example, on all of the inner surface and/or outer surface or on at least part of the inner surface and/or outer surface of the food container.
- The paper-based food container according to any of the preceding claims, wherein the food container is a self-heating food container including a part for containing the food and a part for heating the food, wherein the coating system is applied on all of the surface or on at least part of the surface of the self-heating food container, for example, on all of the inner surface and/or outer surface or on at least part of the inner surface and/or outer surface of the self-heating food container.
- The paper-based food container according to any of the preceding claims, wherein the acrylic pre-coat is formed by applying an acrylic emulsion on the surface of the food container, for example by spraying, and wherein preferably, the acrylic emulsion is prepared from a raw material comprising one or more acrylic monomers and optionally one or more other monomers, wherein the acrylic monomer is preferably selected from the group consisting of methyl acrylate, ethyl acrylate, 2-hydroxyethyl acrylate, propyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, cyclohexyl acrylate, methyl methacrylate, ethyl methacrylate, hydroxyethyl methacrylate, propyl methacrylate, n-butyl methacrylate, cyclohexyl methacrylate, isobutyl methacrylate, methacrylic acid, and a combination thereof, and/or wherein the one or more other monomers is preferably selected from the group consisting of styrene monomer, acrylonitrile monomer and a combination thereof.
- The paper-based food container according to claim 4, wherein the acrylic emulsion is styrene acrylic copolymer emulsion.
- The paper-based food container according to any of the preceding claims, wherein the silicone top-coat is formed by applying a silicone emulsion on the acrylic pre-coat, for example by spraying, and wherein preferably, the silicone emulsion comprises:(A) at least one polyorganosiloxane A comprising, per molecule, at least two C 2-C 6 alkenyl radicals bonded to silicon atoms,(B) at least one polyorganohydrogenosiloxane B comprising, per molecule, at least two hydrogen atoms bonded to an identical or different silicon atom,(C) at least a catalyst C selected from the group consisting of platinum group metal or compound,(D) at least one emulsifying agent D, preferably selected from surfactants and/or protective colloids, and more preferably from poly (vinyl alcohol) s (PVAs) ;(E) optionally, at least one antibacterial and/or antiseptic agent E; and(F) water F.
- The paper-based food container according to claim 6, wherein the silicone emulsion comprises:- 15 to 60%by weight, preferably 25 to 50%by weight, and more preferably 30 to 40%by weight of the at least one polyorganosiloxane A,- 3 to 20%by weight, preferably 5 to 15%by weight, and more preferably 6 to 10%by weight of the at least one polyorganohydrogenosiloxane B,- 1 to 200 ppm by weight, preferably 2 to 100 ppm by weight, more preferably 3 to 50 ppm by weight of the at least one catalyst C, calculated based on the amount of platinum group metal,- 5 to 30%by weight, preferably 10 to 25%by weight, and more preferably 15 to 23%by weight of the at least one emulsifying agent D,- 0 to 0.05%by weight, preferably 0.01 to 0.04%by weight, and more preferably 0.02 to 0.03%by weight of the at least one antibacterial and/or antiseptic agent E, and- 20 to 70%by weight, preferably 25 to 60%by weight, and more preferably 30 to 50%by weight of the water F,with respect to the total weight of the silicone emulsion.
- The paper-based food container according to any of claims 4 to 7, wherein the pre-coat amount on the basis of dry weight of the acrylic emulsion is from 2 to 40g/m 2, or from 3 to 30g/m 2, or from 5 to 20g/m 2, or from 10 to 15g/m 2, and/or the top-coat amount on the basis of dry weight of the silicone emulsion is from 1 to 40g/m 2, or from 2 to 30g/m 2, or from 3 to 25g/m 2, or from 5 to 20g/m 2, or from 10 to 15g/m 2, and/or the total coating amount on the basis of dry weight of the acrylic emulsion and the silicone emulsion is from 3 to 60g/m 2, or from 5 to 50g/m 2, or from 10 to 40g/m 2, or from 15 to 30g/m 2, or from 20 to 25g/m 2.
- The paper-based food container according to any of the preceding claims, wherein the food container contains an edible substance, preferably in solid or liquid state, for example, an instant food, especially a self-heating instant food, or beverages such as coffee, tea or water.
- The paper-based food container according to any of the preceding claims, wherein the food container is selected from the group consisting of a self-heating hot pot, a self-heating lunch box, a self-heating beverage cup such as water cup.
- The paper-based food container according to any of the preceding claims, wherein the food container is a pulp molded food container, preferably a self-heating pulp molded food container, such as a self-heating pulp molded hot pot, a self-heating pulp molded lunch box, a self-heating pulp molded beverage cup such as water cup.
- A method for preparing a paper-based food container, preferably a paper-based self-heating food container according to any of the preceding claims, comprising:- providing a raw paper-based food container;- applying an acrylic emulsion on a surface of the food container, preferably by spraying, so as to form an acrylic pre-coat;- drying the acrylic pre-coat;- applying a silicone emulsion on the acrylic pre-coat, preferably by spraying, so as to form a silicone top-coat; and- curing the silicone top-coat, for example by heating at the temperature of 60℃-160℃, or 80℃-130℃, to obtain the food container having the coating system.
- The method according to claim 12, wherein the coating system is applied on all of the surface or on at least part of the surface of the food container, for example, on all of the inner surface and/or outer surface or on at least part of the inner surface and/or outer surface of the food container.
- The method according to any of claims 12 to 13, wherein the pre-coat amount on the basis of dry weight of the acrylic emulsion is from 2 to 40g/m 2, or from 3 to 30g/m 2, or from 5 to 20g/m 2, or from 10 to 15g/m 2, and/or the top-coat amount on the basis of dry weight of the silicone emulsion is from 1 to 40g/m 2, or from 2 to 30g/m 2, or from 3 to 25g/m 2, or from 5 to 20g/m 2, or from 10 to 15g/m 2, and/or the total coating amount on the basis of dry weight of the acrylic emulsion and the silicone emulsion is from 3 to 60g/m 2, or from 5 to 50g/m 2, or from 10 to 40g/m 2, or from 15 to 30g/m 2, or from 20 to 25g/m 2.
- Use of a coating system in a paper-based food container, preferably a paper-based self-heating food container, especially for improving one or more of, preferably all of water resistance, oil resistance, high temperature water vapor barrier property, structure strength and recyclability, said coating system comprises or preferably consists of:- an acrylic pre-coat; and- a silicone top-coat;the coating system is preferably defined according to any of claims 1-11.
- A paper-based substrate coated with a coating system, preferably used for manufacturing a food container, especially a self-heating food container, said coating system comprises or preferably consists of:- an acrylic pre-coat; and- a silicone top-coat,the coating system is preferably defined according to any one of claims 1-11.
- A coating system comprising or preferably consisting of:- an acrylic pre-coat; and- a silicone top-coat,the coating system is preferably defined according to any one of claims 1-11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2022/142469 WO2024138379A1 (en) | 2022-12-27 | 2022-12-27 | Use of coating system comprising acrylic pre-coat and silicone top-coat in a paper-based food container and the paper-based food container coated with the coating system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2022/142469 WO2024138379A1 (en) | 2022-12-27 | 2022-12-27 | Use of coating system comprising acrylic pre-coat and silicone top-coat in a paper-based food container and the paper-based food container coated with the coating system |
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|---|---|
| WO2024138379A1 true WO2024138379A1 (en) | 2024-07-04 |
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