WO2022202660A1 - 樹脂組成物、コーティング溶液、フィルム及び多層構造体 - Google Patents
樹脂組成物、コーティング溶液、フィルム及び多層構造体 Download PDFInfo
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- WO2022202660A1 WO2022202660A1 PCT/JP2022/012589 JP2022012589W WO2022202660A1 WO 2022202660 A1 WO2022202660 A1 WO 2022202660A1 JP 2022012589 W JP2022012589 W JP 2022012589W WO 2022202660 A1 WO2022202660 A1 WO 2022202660A1
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- 235000019447 hydroxyethyl cellulose Nutrition 0.000 description 1
- 229920003063 hydroxymethyl cellulose Polymers 0.000 description 1
- 229940031574 hydroxymethyl cellulose Drugs 0.000 description 1
- 239000001863 hydroxypropyl cellulose Substances 0.000 description 1
- 235000010977 hydroxypropyl cellulose Nutrition 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000001095 inductively coupled plasma mass spectrometry Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 239000012784 inorganic fiber Substances 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 150000004694 iodide salts Chemical class 0.000 description 1
- 229920000554 ionomer Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000004611 light stabiliser Substances 0.000 description 1
- 229920000092 linear low density polyethylene Polymers 0.000 description 1
- 239000004707 linear low-density polyethylene Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 229920001179 medium density polyethylene Polymers 0.000 description 1
- 239000004701 medium-density polyethylene Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910001509 metal bromide Inorganic materials 0.000 description 1
- 229910001512 metal fluoride Inorganic materials 0.000 description 1
- 229910001511 metal iodide Inorganic materials 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 125000005641 methacryl group Chemical group 0.000 description 1
- FQPSGWSUVKBHSU-UHFFFAOYSA-N methacrylamide Chemical compound CC(=C)C(N)=O FQPSGWSUVKBHSU-UHFFFAOYSA-N 0.000 description 1
- 125000005394 methallyl group Chemical group 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 235000010981 methylcellulose Nutrition 0.000 description 1
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 229920001220 nitrocellulos Polymers 0.000 description 1
- CCCMONHAUSKTEQ-UHFFFAOYSA-N octadec-1-ene Chemical compound CCCCCCCCCCCCCCCCC=C CCCMONHAUSKTEQ-UHFFFAOYSA-N 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 239000001254 oxidized starch Substances 0.000 description 1
- 235000013808 oxidized starch Nutrition 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000000088 plastic resin Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Chemical class 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920001083 polybutene Polymers 0.000 description 1
- 125000003367 polycyclic group Chemical group 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- 229920001470 polyketone Polymers 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 229920003225 polyurethane elastomer Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 239000005033 polyvinylidene chloride Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 229920001592 potato starch Polymers 0.000 description 1
- UIIIBRHUICCMAI-UHFFFAOYSA-N prop-2-ene-1-sulfonic acid Chemical compound OS(=O)(=O)CC=C UIIIBRHUICCMAI-UHFFFAOYSA-N 0.000 description 1
- 229920005604 random copolymer Polymers 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 150000004756 silanes Chemical class 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- HPGGPRDJHPYFRM-UHFFFAOYSA-J tin(iv) chloride Chemical compound Cl[Sn](Cl)(Cl)Cl HPGGPRDJHPYFRM-UHFFFAOYSA-J 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 description 1
- TZYULTYGSBAILI-UHFFFAOYSA-M trimethyl(prop-2-enyl)azanium;chloride Chemical compound [Cl-].C[N+](C)(C)CC=C TZYULTYGSBAILI-UHFFFAOYSA-M 0.000 description 1
- ZQYKGADTDCTWSZ-UHFFFAOYSA-N trimethyl-[(prop-2-enoylamino)methyl]azanium;chloride Chemical compound [Cl-].C[N+](C)(C)CNC(=O)C=C ZQYKGADTDCTWSZ-UHFFFAOYSA-N 0.000 description 1
- 229920001862 ultra low molecular weight polyethylene Polymers 0.000 description 1
- KOZCZZVUFDCZGG-UHFFFAOYSA-N vinyl benzoate Chemical compound C=COC(=O)C1=CC=CC=C1 KOZCZZVUFDCZGG-UHFFFAOYSA-N 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- NLVXSWCKKBEXTG-UHFFFAOYSA-N vinylsulfonic acid Chemical compound OS(=O)(=O)C=C NLVXSWCKKBEXTG-UHFFFAOYSA-N 0.000 description 1
- 239000011592 zinc chloride Substances 0.000 description 1
- 235000005074 zinc chloride Nutrition 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L29/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical; Compositions of hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Compositions of derivatives of such polymers
- C08L29/02—Homopolymers or copolymers of unsaturated alcohols
- C08L29/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/05—Alcohols; Metal alcoholates
- C08K5/053—Polyhydroxylic alcohols
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/06—Ethers; Acetals; Ketals; Ortho-esters
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
- C08K5/098—Metal salts of carboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L101/00—Compositions of unspecified macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L5/00—Compositions of polysaccharides or of their derivatives not provided for in groups C08L1/00 or C08L3/00
- C08L5/08—Chitin; Chondroitin sulfate; Hyaluronic acid; Derivatives thereof
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D129/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Coating compositions based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Coating compositions based on derivatives of such polymers
- C09D129/02—Homopolymers or copolymers of unsaturated alcohols
- C09D129/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F116/00—Homopolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical
- C08F116/02—Homopolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical by an alcohol radical
- C08F116/04—Acyclic compounds
- C08F116/06—Polyvinyl alcohol ; Vinyl alcohol
Definitions
- the present invention relates to a resin composition, and more particularly to a resin composition capable of obtaining a film having high gas barrier properties under high humidity.
- Hydrophilic resins such as polyvinyl alcohol resins are excellent in strength, transparency, and gas barrier properties. It is widely used as a packaging material such as However, since hydrophilic resins have a large number of hydroxyl groups, they are easily affected by humidity, and their gas barrier properties are remarkably lowered in a high-humidity environment.
- Patent Document 1 discloses water-sparingly water-soluble inorganic fine particles having an average particle size of 500 nm or less and a water-soluble or water-dispersible polymer compound, and the water-sparingly water-soluble inorganic fine particles are composed of aluminum, Synthesized by reacting an inorganic compound containing one or more selected from silicon, zinc, zirconium, silver, and tin as an essential component, or a salt thereof, with one or more compounds selected from organic acids, inorganic acids, and salts thereof.
- a material for a gas barrier film is disclosed which is an ionic crystal.
- Patent Document 2 at least one of a water-soluble polymer, a metal alkoxide, a hydrolyzate thereof, and tin chloride, and a general formula (R 1 Si(OR 2 ) 3 )n (where R 1 is an organic functional group) , R 2 is CH 3 , C 2 H 5 , or C 2 H 4 OCH 3 ).
- Patent Document 3 a step of forming a coating film containing zinc ions, at least one of a metal alkoxide and a hydrolyzate thereof, and a water-soluble polymer on the surface of a base film or a laminate containing the same; and forming a gas barrier layer on the surface.
- gas barrier films disclosed in Patent Documents 1 to 3 do not have sufficient gas barrier properties under high humidity, and further improvement is desired.
- the present invention provides a resin composition that has excellent gas barrier properties under high humidity, especially oxygen barrier properties under high humidity.
- the present inventors found that in the process of producing a film using a resin composition containing a hydrophilic resin and a metal compound, the film was statically placed under high humidity. It was found that the gas barrier properties tended to improve under high humidity conditions by providing a humidity conditioning step. In the course of further intensive research, we focused on the relationship between the mass ratio of both the hydrophilic resin and the metal compound and the gas barrier property under high humidity, and set the mass ratio to a specific range (more metal compound than before). It has been found that if the content ratio is controlled within a high range), a film having excellent gas barrier properties, particularly oxygen barrier properties under high humidity conditions can be obtained without requiring a humidity conditioning step.
- the present invention relates to a resin composition containing a hydrophilic resin and a metal compound, in which the mass ratio of the content of the hydrophilic resin to the content of the metal compound in terms of metal (content of the hydrophilic resin: the content of the metal compound in terms of metal) is controlled within a specific range, it is possible to provide a film excellent in gas barrier properties, particularly oxygen barrier properties under high humidity conditions, without requiring a humidity conditioning step.
- a resin composition according to one example of the embodiment of the present invention (hereinafter sometimes referred to as "this resin composition") contains a hydrophilic resin and a metal compound. Each component will be described below.
- hydrophilic resin Specific examples of the hydrophilic resin used in the present resin composition include water-soluble resins such as vinyl alcohol resins, polysaccharides, acrylic resins, and polyether resins.
- the hydrophilic resin may be used alone or in combination of two or more.
- the hydrophilic resin preferably has the following properties when formed into a film, for example. That is, it is preferable that a film having a thickness of 30 ⁇ m is prepared using the hydrophilic resin, and the area change rate is 105% or more when the film is immersed in water at 25° C. for 2 hours.
- the vinyl alcohol-based resin usually excludes resins known as ethylene-vinyl alcohol copolymer resins (ethylene content: 20 to 60 mol%), for example, polyvinyl alcohol (hereinafter referred to as "PVA”) ) based resins.
- PVA polyvinyl alcohol
- the PVA-based resin is usually preferably an unmodified PVA-based resin, but a modified PVA-based resin may also be used.
- the unmodified PVA resin can usually be produced by polymerizing a vinyl ester monomer and saponifying it.
- the modified PVA-based resin can be produced by saponifying a polymer of a vinyl ester-based monomer and another unsaturated monomer, or post-modifying an unmodified PVA-based resin.
- vinyl ester monomer examples include vinyl formate, vinyl acetate, vinyl propionate, vinyl valerate, vinyl butyrate, vinyl isobutyrate, vinyl pivalate, vinyl caprate, vinyl laurate, vinyl stearate, and vinyl versatate.
- aliphatic vinyl esters such as vinyl trifluoroacetate
- aromatic vinyl esters such as vinyl benzoate.
- aliphatic vinyl esters having 3 to 20 carbon atoms are preferred, more preferably 4 to 10 carbon atoms, particularly preferably 4 to 7 carbon atoms, and vinyl acetate is particularly preferred. These are usually used alone, but if necessary, multiple types may be used at the same time.
- Examples of the other unsaturated monomers include olefins such as ethylene, propylene, isobutylene, ⁇ -octene, ⁇ -dodecene and ⁇ -octadecene, acrylic acid, methacrylic acid, crotonic acid, maleic acid and maleic anhydride. , unsaturated acids such as itaconic acid, salts thereof, mono- or dialkyl esters thereof, nitriles such as acrylonitrile and methacrylonitrile, amides such as acrylamide and methacrylamide, ethylenesulfonic acid, allylsulfonic acid, methallylsulfonic acid, etc.
- olefins such as ethylene, propylene, isobutylene, ⁇ -octene, ⁇ -dodecene and ⁇ -octadecene, acrylic acid, methacrylic acid, crotonic acid, maleic acid and maleic anhydride
- alkyl vinyl ethers N-acrylamidomethyltrimethylammonium chloride, allyltrimethylammonium chloride, dimethylallyl vinyl ketone, N-vinylpyrrolidone, vinyl chloride, vinylidene chloride, polyoxyethylene (meth)allyl ether, Polyoxyalkylene (meth)allyl ether such as polyoxypropylene (meth)allyl ether, polyoxyalkylene (meth)acrylate such as polyoxyethylene (meth)acrylate, polyoxypropylene (meth)acrylate, polyoxyethylene (meth)acrylate Acrylamide, polyoxyalkylene (meth)acrylamide such as polyoxypropylene (meth)acrylamide, polyoxyethylene (1-(meth)acrylamide-1,1-dimethylpropyl) ester, polyoxyethylene vinyl ether, polyoxypropylene vinyl ether, poly Oxyethylene allylamine, polyoxypropylene allylamine,
- (meth)allyl means allyl or methallyl
- (meth)acrylate means acrylate or methacrylate
- (meth)acryl means acrylic or methacryl, respectively.
- the PVA-based resin can be obtained by any known polymerization method, saponification method, and post-modification method.
- the amount of the other unsaturated monomer to be introduced and the amount of modification by post-modification are appropriately set depending on the type of monomer, but are usually 15 mol % or less, particularly 10 mol % or less. If the amount is too large, the crystallinity of the PVA-based resin tends to decrease, and the gas barrier properties of the film tend to decrease.
- the average saponification degree of the PVA-based resin is usually 70 to 100 mol%, preferably 80 to 100 mol%, particularly preferably 85 to 100 mol%, further preferably 90 to 99.99 mol%.
- the average degree of saponification is measured according to JIS K6726.
- the average degree of polymerization of the PVA-based resin is usually 100 to 4,000, preferably 125 to 3,000, particularly preferably 150 to 2,500, particularly preferably 200 to 2,250, and most preferably 150 to 2,500. It is preferably 250 to 2,000. If the average degree of polymerization is too low, mechanical properties such as film strength tend to decrease, and if it is too high, it tends to be difficult to handle, such as difficulty in forming an aqueous solution. The average degree of polymerization is measured according to JIS K 6726.
- PVA-based resin two or more different modified species, modified amount, average degree of saponification, average degree of polymerization, etc. may be used in combination.
- polysaccharide examples include starch, cellulose, N-acetylglucosamine derivatives and the like.
- starch include natural starch such as corn starch and potato starch, and modified starch such as etherified starch, esterified starch, crosslinked starch, grafted starch, roasted dextrin, enzyme-modified dextrin, pregelatinized starch, and oxidized starch. Starch etc. are mentioned.
- Examples of the cellulose include carboxymethylcellulose, methylcellulose, ethylcellulose, hydroxymethylcellulose, hydroxypropylmethylcellulose, hydroxyethylcellulose, hydroxyethylmethylcellulose, hydroxypropylcellulose, nitrocellulose, cationized cellulose, and metal salts thereof such as sodium salts. is mentioned.
- Examples of the N-acetylglucosamine derivatives include chitin, chitosan and chitosan derivatives.
- Examples of chitosan derivatives include hydroxyalkylchitosan, carboxyalkylchitosan, carboxyacylchitosan, succinylchitosan, and cationized chitosan.
- acrylic resin examples include polyacrylamide, polyacrylic acid, and metal salts such as sodium salts thereof.
- polyether resin examples of the polyether-based resin include polyethylene glycol and polypropylene glycol.
- hydrophilic resins vinyl alcohol-based resins and polysaccharides are preferable, and more preferably PVA-based resins, modified starch (especially soluble starch), hydroxypropylmethylcellulose, Chitosan is preferred, most preferably unmodified PVA-based resin, chitosan.
- the metal compound used in the present resin composition preferably has a structure in which specific structural units are layered at specific interplanar spacings.
- the structural unit includes metals, hydroxy ligands, and anionic ligands other than hydroxy ligands, and is represented by the following chemical formula (1).
- M a (OH) b A n- (2a-b)/n
- A is an anionic ligand other than a hydroxy ligand having a valence of n-.
- O oxo ligand
- examples of M include Na, K, Ca, Mg, Si, Al, Ti, Cr, Mn, Fe, Co, Ni, Cu, and Zn. These metal species may be contained alone or in combination of two or more. Among them, Al, Si, Mg, Ni, Co, and Zn are preferred, Ni, Co, and Zn are particularly preferred, and Zn is particularly preferred, from the viewpoint of excellent oxygen barrier properties under high humidity.
- A is, for example, RO (alkoxy ligand), ROCO (carboxylic acid ligand), CO 3 , NO 3 , SO 3 , PO 4 , BO 3 , F, Br , Cl, etc.
- the alkyl chain is It may have a functional group such as an OH group).
- O oxo ligand
- These anionic ligands may be contained alone or in combination of two or more.
- NO 3 , Cl, RO, and ROCO are preferable
- ROCO is particularly preferable
- CH 3 OCO is particularly preferable, from the viewpoint of interaction with the hydrophilic resin.
- the metal compound used in this resin composition may contain water molecules.
- the wide-angle X-ray diffraction is measured under the following conditions, for example.
- the interlayer distance (distance between layers) of the metal compound is preferably 0.01 to 50 nm, more preferably 0.1 to 30 nm, from the viewpoint of interaction with hydrophilic resin molecules and water molecules. is more preferable.
- the molecular weight of the layered structural unit separated from the metal compound is preferably 100 to 10,000, more preferably 200 to 2,000, in terms of interaction at the molecular level of the hydrophilic resin. Especially preferred.
- the layered structural unit is preferably hydrophilic from the viewpoint of interaction with the molecules of the hydrophilic resin. Furthermore, it is preferable that the layered structural unit does not decompose even after standing for 1,000 hours in an environment of 20° C. and 90% RH.
- a specific example of the metal compound is a layered compound containing Zn as a metal species.
- a Zn-containing layered compound represented by the chemical formula [Zn 5 (OH) 8 (CH 3 CO 2 ) 2 2H 2 O] is preferable from the viewpoint of excellent oxygen barrier properties under high humidity.
- the metal compound and the hydrophilic resin interact with each other to increase the polarity of the hydrophilic resin, resulting in the effect of excellent oxygen barrier properties under high humidity.
- the metal compound is prepared by, for example, (I) a method of reacting a metal-containing compound in the presence of a base, (II) a method of reacting a metal-containing compound by heating, or (III) a method of reacting a metal-containing compound by stirring. Obtainable.
- metal-containing compounds used in the above methods include organic acid metal salts and inorganic metal salts.
- organic acid constituting the organic acid metal salt examples include monovalent carboxylic acids such as acetic acid; divalent carboxylic acids such as succinic acid, oxalic acid and tartaric acid; and the like. These may be used alone or in combination of two or more.
- the organic acid metal salt may be a hydrate or an anhydride.
- the organic acid metal salt is preferably a monovalent carboxylic acid metal salt, particularly preferably an acetate metal salt, and particularly preferably zinc acetate or its hydration, from the viewpoint of excellent oxygen barrier properties under high humidity. It is a thing.
- the inorganic metal salts include metal fluorides, chlorides, bromides, iodides, and oxoacids. These may be used alone or in combination of two or more. Moreover, the inorganic metal salt may be a hydrate or an anhydride. As the inorganic metal salt, metal chlorides and oxoacids are preferable, and zinc chloride, zinc nitrate, and hydrates thereof are particularly preferable because they have excellent oxygen barrier properties under high humidity. Each method will be described in detail below.
- the method (I) is a method of reacting a metal-containing compound in the presence of a base.
- the base used in the method (I) include hydroxides of alkali metals or alkaline earth metals. Among these, alkali metal hydroxides are preferred, and sodium hydroxide is particularly preferred, because of their excellent reactivity with metal-containing compounds.
- the metal-containing compound and the base are usually mixed in a solution and reacted.
- the method of mixing the metal-containing compound and the base is not particularly limited. Examples include a method of mixing a liquid and a solution in which a base is dissolved. Among them, from the viewpoint of reaction efficiency, a method of mixing a solution in which a metal-containing compound is dissolved and a solution in which a base is dissolved is preferable. Furthermore, when an organic acid metal salt is used as the metal-containing compound, a method of adding and mixing a solution in which an organic acid metal salt is dissolved in a solution in which a base is dissolved is preferable. A method of adding and mixing a solution in which a base is dissolved in a solution in which an inorganic metal salt is dissolved is preferred.
- the solvent for dissolving the metal-containing compound and the base is not particularly limited as long as it can dissolve the metal-containing compound and the base.
- Examples include water, methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, Lower alcohols having 1 to 5 carbon atoms such as 2-butanol are included. These may be used alone or in combination of two or more. Among them, water is preferable because post-treatment is easy.
- the concentration of the metal-containing compound in the solution in which the metal-containing compound is dissolved is usually 0.5 to 3 mol/L, preferably 1 to 2 mol/L.
- the concentration of the base in the solution in which the base is dissolved in the solvent is usually 0.01 to 100 mol/L, preferably 0.1 to 30 mol/L, particularly preferably 1 to 10 mol/L. If the concentrations of the metal-containing compound and the base are too low, the reaction tends not to proceed sufficiently. Also, if the concentrations of the metal-containing compound and the base are too high above the above ranges, side reactions tend to occur.
- the molar ratio of the metal-containing compound to the base is generally 0.5:2 to 2:0.5, preferably 0.8:1.5 to 1.5:0. 8, particularly preferably 0.9:1.2 to 1:1. If the molar ratio is outside the above range, the reaction tends not to proceed sufficiently.
- the pH at which the metal-containing compound and the base are reacted is usually 4-9, preferably 5-8. If the pH is much lower than the above range, the reaction tends not to proceed sufficiently. If the pH is too high above the above range, the resulting metal compound tends to decompose.
- the pH is adjusted by adjusting the amount of the solution in which the metal-containing compound is dissolved and the amount of the solution in which the base is dissolved.
- the reaction temperature in the above reaction is usually 15 to 60°C, preferably 20 to 40°C. If the reaction temperature is too low, the reaction tends not to proceed sufficiently, and if the reaction temperature is too high, the metal-containing compound is thermally decomposed and the target metal compound tends not to be obtained.
- the reaction time is generally 0.5 to 5 hours, preferably 1 to 3 hours, and the reaction pressure may be normal pressure.
- a metal compound is obtained as a precipitate.
- the obtained metal compound may be used as it is, but it is preferable to use it after purifying the metal compound by washing, pulverization, or the like.
- the method (II) is a method of heating and reacting the metal-containing compound.
- the method (II) is usually carried out by heating the solution in which the metal-containing compound is dissolved while stirring.
- the solvents listed in the method (I) above can be used.
- water and alcohols are preferred, water and lower alcohols having 1 to 5 carbon atoms are particularly preferred, and water and ethanol are more preferred.
- the temperature of the solution is usually 20 to 100.degree. C., preferably 50 to 95.degree. C., and particularly preferably 70 to 90.degree.
- the reaction time is generally 0.1 to 10 hours, preferably 0.5 to 7 hours, particularly preferably 1 to 5 hours, and the reaction pressure may be normal pressure.
- the stirring rotation speed is usually 10 to 5,000 rpm, preferably 100 to 2,500 rpm, particularly preferably 300 to 2,000 rpm.
- a metal compound is obtained as a precipitate.
- the obtained metal compound may be used as it is, or the metal compound may be purified by washing, pulverization, or the like.
- the method (III) is a method of reacting by stirring the metal-containing compound.
- the method (III) is usually carried out by stirring the solution in which the metal-containing compound is dissolved.
- the solvents listed in the method (I) above can be used.
- water and alcohols are preferred, water and lower alcohols having 1 to 5 carbon atoms are particularly preferred, and water and ethanol are more preferred.
- the temperature of the solution is usually 10 to 25°C, preferably 15 to 25°C, and particularly preferably 20 to 25°C.
- the reaction time (stirring time) is generally 0.5 to 60 minutes, preferably 1 to 30 minutes, particularly preferably 1 to 10 minutes, and the reaction pressure may be normal pressure.
- the stirring rotation speed is usually 100 to 20,000 rpm, preferably 1,000 to 10,000 rpm, particularly preferably 2,000 to 8,000 rpm.
- a metal compound is obtained as a precipitate.
- the obtained metal compound may be used as it is, or the metal compound may be purified by washing, pulverization, or the like.
- Metal compounds generally refer to, for example, metal salts, metal oxides, metal complexes, simple metals or alloys. It is a metal layered compound having a structure in which layered structural units represented by are layered at specific interplanar spacings. When hydrophilic resin molecules and water molecules are present around the metal compound, the metal layered compound separates the layers of the metal compound, and the separated fine layered structural units separate from the hydrophilic resin at the molecular level. It is presumed that the excellent oxygen barrier property is obtained as a result of the interaction at .
- the present resin composition contains compounding agents that are generally compounded in resin compositions, such as heat stabilizers, antioxidants, antistatic agents, colorants, ultraviolet absorbers, as long as the effects of the present invention are not impaired.
- a coupling agent, an oxygen absorber, and the like may be contained. These can be used alone or in combination of two or more.
- the present resin composition can be obtained by mixing a hydrophilic resin, a metal compound, and, if necessary, other components.
- the present resin composition contains a hydrophilic resin and a metal compound. Then, since the mass ratio of the content of the hydrophilic resin and the content of the metal compound in terms of metal (content of the hydrophilic resin: the content of the metal compound in terms of metal) is 90: 10 to 20: 80, it was made into a film. It has excellent gas barrier properties, particularly oxygen barrier properties, under high humidity conditions. From the viewpoint of further improving the gas barrier property under high humidity, especially the oxygen barrier property, the mass ratio of the hydrophilic resin content and the metal conversion content of the metal compound (hydrophilic resin content: metal conversion of the metal compound content) is preferably 85:15 to 30:70, and may be 83:17 to 55:45.
- the content of such a metal compound is too low or too high, the oxygen barrier properties under high humidity tend to deteriorate.
- the content is the total amount (total amount of metal conversion values) of all the metal compounds contained in the resin composition. Also, the content of the metal compound can be determined by a standard addition method using ICP-MS.
- This resin composition is extremely useful in that it can provide a film with excellent gas barrier properties, especially oxygen barrier properties, under high humidity conditions without requiring a humidity conditioning step. That is, according to the findings of the present inventors, in the production process of a film produced using a resin composition containing a hydrophilic resin and a metal compound, a humidity conditioning step of leaving the film at high humidity for a predetermined period of time is added.
- the gas barrier property tends to be improved under high humidity conditions by having a By controlling the content of the compound in terms of metal) within a specific range, a film with excellent gas barrier properties under high humidity can be obtained without the step of standing under high humidity, which is extremely useful.
- the principle of eliminating the need for the humidity conditioning step of standing under high humidity is not clear, but as the amount of the metal compound dispersed in the film increases, it interacts with the hydrophilic resin. Alternatively, it is presumed that the localization efficiency on the surface of the film was improved.
- a method for producing a film produced using a resin composition containing the hydrophilic resin and the metal compound A preparation step of preparing a resin composition having a mass ratio of the content in terms of metal (content of hydrophilic resin: content in terms of metal of metal compound) of 90:10 to 20:80, and using the resin composition and a film forming step of forming a film by the above film forming step, and does not have a humidity conditioning step of leaving the film obtained by the film forming step under high humidity for a predetermined time. preferably provided.
- High humidity means 20 ⁇ 5°C and 90 ⁇ 10% RH.
- the predetermined time when left standing for a predetermined time under high humidity means 70 hours or longer, particularly 300 hours or longer, and particularly 600 hours or longer. Also, the upper limit of the predetermined time is usually 1,000 hours.
- the humidity conditioning process of standing still under such high humidity is unnecessary, but the film may be manufactured through the humidity conditioning process.
- the mass ratio of the content of the hydrophilic resin to the content of the metal compound is 82:18 to 8:92. From the viewpoint of further improving the gas barrier properties, particularly the oxygen barrier properties, in the lower layer, it is preferably 80:20 to 10:90.
- the total content of the hydrophilic resin and the metal compound used in the present resin composition is usually 80% by mass or more, preferably 85% by mass or more, and particularly preferably 90% by mass, based on the total amount of the resin composition. % or more, more preferably 95 mass % or more, most preferably 98 mass % or more. In addition, an upper limit is usually 100 mass %.
- a film containing the present resin composition is a film obtained by forming a film from the present resin composition.
- Examples of the method for forming the film include a method using a coating solution in which the present resin composition is in a solution or dispersion state, and a pellet-like composition containing the present resin composition melted using an extruder.
- a molding method and the like can be mentioned.
- a method using a coating solution is preferable.
- the coating solution is usually 0.5 to 30% by mass, preferably 5 to 20% by mass, and may be 10 to 20% by mass.
- Preparation of the coating solution includes, for example, a method of adding all components to a solvent at once and mixing, a method of adding and mixing other components to a solution in which some components are dissolved in a solvent, and the like. Among them, from the viewpoint of workability, a method of adding and mixing other components to a solution obtained by dissolving a hydrophilic resin in a solvent is preferable. In the method for obtaining the metal compound described above, it is also preferable to dissolve the hydrophilic resin in the solvent when the metal-containing compound is reacted. It is preferable when obtaining a compound.
- the solvents listed for the metal compound can be used, and water and alcohols are preferable, water and lower alcohols having 1 to 5 carbon atoms are particularly preferable, and water and ethanol are more preferable.
- the content of the solvent with respect to the total amount of the coating solution is, for example, 50% by mass or more, 60% by mass or more, 70% by mass or more, 80% by mass or more, 85% by mass or more, 90% by mass or more, etc. good too.
- the upper limit is usually about 95% by mass.
- the film-forming method for example, known methods such as a melt extrusion method, an endless belt method, a drum method, and a casting method using a coating method can be adopted.
- the casting method is preferable, and the coating method is particularly preferable.
- Examples of the coating method include known methods such as bar coater, roll coating, die coating, gravure coating, comma coating, and screen printing.
- a film containing the resin composition can be obtained by drying, for example, by heat treatment at 60 to 105°C for 0.5 to 10 minutes. Moreover, the film may be subjected to a stretching operation such as uniaxial stretching or biaxial stretching, if necessary.
- the film containing the present resin composition may be a monolayer film in which the number of films containing the present resin composition is 1, or a laminated film in which the number of films containing the present resin composition is 2 or more. (These may be referred to as “this film” hereinafter).
- the thickness of the present film is usually 0.1 to 200 ⁇ m, preferably 0.2 to 100 ⁇ m, particularly preferably 0.3 to 50 ⁇ m. There may be.
- the thickness is the total thickness of all the films constituting the laminated film.
- the oxygen permeability of the film is, for example, 80 cc/3 ⁇ m/m 2 day/atm or less, 70 cc/3 ⁇ m/m 2 day/atm or less, 60 cc/3 ⁇ m/m 2 day/atm or less, 50 cc/3 ⁇ m/m/m 2 day/atm or less.
- the oxygen permeability is measured in an environment of 23° C. and 80% RH, and the lower limit of the oxygen permeability is usually 0 cc ⁇ 3 ⁇ m/m 2 ⁇ day ⁇ atm.
- the oxygen permeability can be determined by an oxygen permeability measuring device.
- An embodiment of the present film is a film containing a resin composition containing a hydrophilic resin and a metal compound, wherein the resin composition contains the content of the hydrophilic resin and the metal conversion content of the metal compound
- the mass ratio of (hydrophilic resin content: metal conversion content of metal compound) is 90: 10 to 20: 80, and at least one of Staphylococcus aureus or Escherichia coli, preferably both, measured according to JIS Z2801: 2010 It is preferably provided as a film having an antibacterial activity value of 2 or more.
- films having an antibacterial activity value of 3 or more are particularly preferred, and films having an antibacterial activity value of 4 or more are more preferred.
- the upper limit of the antibacterial activity value is not particularly limited, it is usually about 10.
- the mass ratio of the content of the hydrophilic resin to the content of the metal compound in terms of metal is preferably 85:15 to 65:35.
- a film containing the present resin composition is extremely excellent in transparency, and the transparency is significantly superior to a film containing an inorganic stratiform compound or a filler.
- the film containing the present resin composition preferably has a haze of 1% or less, more preferably 0.6% or less, even more preferably 0.3% or less, and particularly preferably 0.3% or less. 2% or less.
- the haze is a HAZE value measured according to the standard of JIS K7361-1. For example, 10 test pieces of 50 mm ⁇ 50 mm are cut out from the film, and a haze meter (for example, NDH manufactured by Nippon Denshoku Co., Ltd. -4000), and the average value of 10 sheets is taken as the size (%).
- the present film may be laminated with another film substrate, paper substrate, or the like to form a multilayer structure. That is, a layer made of the film (hereinafter sometimes referred to as "film layer”) and a layer made of a substrate such as a film substrate or paper substrate (hereinafter sometimes referred to as “substrate layer”). It is good also as a multilayer structure which has.
- the film layer may be a layer composed of a single-layer film in which the number of films containing the present resin composition is 1, or a layer composed of a laminated film in which the number of films containing the present resin composition is 2 or more. may be
- the thickness of the film layer is usually 0.1 to 200 ⁇ m, preferably 0.2 to 100 ⁇ m, particularly preferably 0.3 to 50 ⁇ m. may be
- the film substrate constituting the substrate layer examples include a film made of a plastic resin.
- plastic resins are not particularly limited, and examples include linear low-density polyethylene, low-density polyethylene, ultra-low-density polyethylene, medium-density polyethylene, high-density polyethylene, ethylene-propylene (block and random) copolymer, ethylene -polyethylene resins such as ⁇ -olefin ( ⁇ -olefin having 4 to 20 carbon atoms) copolymer, polypropylene resin such as polypropylene, propylene- ⁇ -olefin ( ⁇ -olefin having 4 to 20 carbon atoms) copolymer , Polybutene, polypentene, polycyclic olefin resins (polymers having a cyclic olefin structure in at least one of the main chain and side chain) and other (unmodified) polyolefin resins, and these polyolefins are added to unsaturated carboxy
- the paper base material constituting the base material layer is not particularly limited, and examples thereof include high-quality paper, medium - quality paper, coated paper, lightly coated paper, glassine paper, Unbleached or bleached kraft paper (acidic paper or neutral paper), one-sided glossy paper, kraft paper, paperboard (for corrugated board, building materials, white ball, chipboard, etc.), white paperboard, manila ball, etc. mentioned.
- Additives such as a sizing agent and aluminum sulfate may be added to the paper substrate.
- the pulp constituting the paper substrate is not particularly limited, and any pulp that is usually used for paper manufacturing can be used.
- chemical pulp such as hardwood bleached kraft pulp (LBKP), softwood bleached kraft pulp (NBKP), hardwood bleached sulfite pulp (LBSP), softwood bleached sulfite pulp (NBSP); groundwood pulp (GP), thermomechanical pulp ( mechanical pulp such as TMP); and the like can be used.
- non-wood pulp such as cotton, cotton linter, hemp, bagasse, kenaf, esparto, mulberry, mitsumata, and gampi
- synthetic fiber such as synthetic pulp, polyethylene and polypropylene; inorganic fiber; can be used.
- the thickness of the multilayer structure according to one embodiment of the present invention is usually 10-2000 ⁇ m, preferably 15-1000 ⁇ m, particularly preferably 20-500 ⁇ m.
- the present resin composition and the film obtained from the present resin composition are useful as a packaging material, and can be particularly suitably used as a packaging material for foods, pharmaceuticals, and the like.
- a homogenizer manufactured by Tokushu Kika Kogyo Co., Ltd., T.K Robomics
- the mass ratio of each component contained in the solution of the resin composition obtained above, and the mass ratio of the content of PVA contained in the solution of the resin composition obtained above and the content of the metal compound in terms of metal [ Content of PVA: content of metal compound in terms of metal] is shown in Table 1.
- the resulting resin composition solution was applied to the corona-treated surface of a PET substrate having a thickness of 38 ⁇ m using a wire bar #18 and dried at 120° C. for 5 minutes. A two-layer film was prepared with laminated 5.9 ⁇ m film layers.
- Example 2 In Example 1, 40 parts of the metal compound-containing solution and 60 parts of the 15% aqueous solution of PVA were used, and the thickness of the film layer laminated on the PET substrate was as shown in Table 1. A solution of the resin composition was prepared (solid concentration: 15%), and a film was produced in the same manner. As in Example 1, Table 1 shows the mass ratio of each component contained in the solution of the resin composition obtained above.
- Example 3 In Example 1, 50 parts of the metal compound-containing solution and 50 parts of the 15% aqueous solution of PVA were used, and the thickness of the film layer laminated on the PET substrate was as shown in Table 1. A solution of the resin composition was prepared (solid concentration: 15%), and a film was produced in the same manner. As in Example 1, Table 1 shows the mass ratio of each component contained in the solution of the resin composition obtained as described above.
- Example 4 In Example 1, 60 parts of the metal compound-containing solution and 40 parts of the 15% aqueous solution of PVA were used, and the thickness of the film layer laminated on the PET substrate was as shown in Table 1. A solution of the resin composition was prepared (solid concentration: 15%), and a film was produced in the same manner. As in Example 1, Table 1 shows the mass ratio of each component contained in the solution of the resin composition obtained as described above.
- Example 5 In Example 1, 70 parts of the metal compound-containing solution and 30 parts of the 15% aqueous solution of PVA were used, and the thickness of the film layer laminated on the PET substrate was as shown in Table 1. A solution of the resin composition was prepared (solid concentration: 15%), and a film was produced in the same manner. As in Example 1, Table 1 shows the mass ratio of each component contained in the solution of the resin composition obtained as described above.
- Example 6> In Example 1, the procedure was the same as in Example 1 except that the metal compound-containing solution was 80 parts, the 15% aqueous solution of PVA was 20 parts, and the thickness of the film layer laminated on the PET substrate was as shown in Table 1. A solution of the resin composition was prepared (solid concentration: 15%), and a film was produced in the same manner. As in Example 1, Table 1 shows the mass ratio of each component contained in the solution of the resin composition obtained as described above.
- Example 7 In Example 1, the procedure was the same as in Example 1 except that the metal compound-containing solution was 90 parts, the 15% aqueous solution of PVA was 10 parts, and the thickness of the film layer laminated on the PET substrate was as shown in Table 1. A solution of the resin composition was prepared (solid concentration: 15%), and a film was produced in the same manner. As in Example 1, Table 1 shows the mass ratio of each component contained in the solution of the resin composition obtained as described above.
- a resin composition solution coating solution
- solid concentration: 5% solid concentration
- the obtained solution of the resin composition was applied to the corona-treated surface of a PET substrate having a thickness of 38 ⁇ m, which had been subjected to corona treatment, using a wire bar #18, dried at 80° C. for 5 minutes, and coated on the PET substrate to a thickness of 38 ⁇ m.
- a two-layer film was prepared by laminating 1 ⁇ m film layers.
- Example 9 In Example 8, 15 parts of the metal compound-containing solution and 50 parts of the 3% aqueous solution of chitosan were used, and the thickness of the film layer laminated on the PET substrate was as shown in Table 1. A solution of the resin composition was prepared (solid concentration: 5.7%), and a film was produced in the same manner. As in Example 8, Table 1 shows the mass ratio of each component contained in the solution of the resin composition obtained as described above.
- Example 1 except that the metal compound-containing solution was 0.7 parts, the 15% aqueous solution of PVA was 99.3 parts, and the thickness of the film layer laminated on the PET substrate was as shown in Table 1.
- a solution of the resin composition was prepared in the same manner as in 1 (solid concentration: 15%), and a film was produced in the same manner.
- Table 1 shows the mass ratio of each component contained in the solution of the resin composition obtained as described above.
- Example 1 except that the metal compound-containing solution was 4.7 parts, the 15% aqueous solution of PVA was 95.3 parts, and the thickness of the film layer laminated on the PET substrate was as shown in Table 1.
- a solution of the resin composition was prepared in the same manner as in 1 (solid concentration: 15%), and a film was produced in the same manner.
- Table 1 shows the mass ratio of each component contained in the solution of the resin composition obtained as described above.
- Example 3 ⁇ Comparative Example 3>
- 10 parts of the metal compound-containing solution and 90 parts of the 15% aqueous solution of PVA were used, and the thickness of the film layer laminated on the PET substrate was as shown in Table 1.
- a solution of the resin composition was prepared (solid concentration: 15%), and a film was produced in the same manner.
- Table 1 shows the mass ratio of each component contained in the solution of the resin composition obtained as described above.
- Example 4 In Example 1, the same procedure as in Example 1 was performed except that the metal compound-containing solution was not included, 100 parts of a 15% aqueous solution of PVA was used, and the thickness of the film layer laminated on the PET substrate was as shown in Table 1. A solution of the resin composition was prepared (solid concentration: 15%), and a film was produced in the same manner. As in Example 1, Table 1 shows the mass ratio of each component contained in the solution of the resin composition obtained as described above.
- the interlayer As a result of calculating the distance, the Zn-containing layered compound [Zn 5 (OH) 8 (CH 3 CO 2 ) 2 .2H 2 O] was a layered compound with an interlayer distance of 1.3 nm.
- the films of each example and each comparative example were produced without undergoing a humidity conditioning process.
- the film of each example whose mass ratio is within the specific range specified in the present invention has excellent oxygen barrier properties under high humidity, while the film of each comparative example whose mass ratio is outside this range is under high humidity It can be seen that the oxygen barrier property is inferior. Therefore, according to the present invention, it is possible to obtain a film having excellent oxygen barrier properties under high humidity without requiring a humidity conditioning step.
- a solution (coating solution) of each resin composition of Examples 2, 9 and Comparative Example 4 was dried using a Meyer bar on a PET film (Taiko polyester film FE2001, #38, manufactured by Futamura Chemical Co., Ltd.). The coating was applied so that the thickness was 4.6 ⁇ m in Example 2, 1.0 ⁇ m in Example 9, and 3.0 ⁇ m in Comparative Example 4, and dried at 120° C. for 5 minutes to form a coating film on the PET film. , to obtain an antibacterial test film.
- the antibacterial test film was tested in accordance with JIS Z 2801:2010, and Staphylococcus aureus and Escherichia coli were evaluated as follows.
- PE film polyethylene film
- Table 2 shows the results.
- ⁇ very good: Antibacterial activity value of 2 or more for both bacteria
- ⁇ good: Antibacterial activity value of 2 or more for only one bacteria
- ⁇ poor: Antibacterial activity value of 2 for both bacteria Less than
- the films of Examples 2 and 9 in which the mass ratio of the content of the hydrophilic resin and the content of the metal compound in terms of metal content is within the specific range defined in the present invention, are excellent in antibacterial properties.
- the film of Comparative Example 4 which is outside the range because it does not contain a metal compound, has slightly inferior antibacterial properties.
- the examples in which the mass ratio of the content of the hydrophilic resin and the content of the metal compound in terms of metal content is within the specific range specified in the present invention are excellent in oxygen barrier properties under high humidity. It can be seen that they are not only excellent, but also excellent in antibacterial properties.
- the resin composition of the present invention is particularly excellent in oxygen barrier properties under high humidity, so it is useful as a packaging material, and can be particularly suitably used as a packaging material for foods, pharmaceuticals, and the like.
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Abstract
Description
しかしながら、親水性樹脂は、水酸基を多く有することから湿度による影響を大きく受けやすく、高湿度環境下ではガスバリア性が著しく低下する。
[1]
親水性樹脂及び金属化合物を含む樹脂組成物であって、前記親水性樹脂の含有量と前記金属化合物の金属換算含有量との質量比(親水性樹脂の含有量:金属化合物の金属換算含量)が、90:10~20:80であることを特徴とする樹脂組成物。
[2]
前記親水性樹脂が、ポリビニルアルコ―ル系樹脂である、[1]記載の樹脂組成物。
[3]
前記親水性樹脂が、多糖類である、[1]記載の樹脂組成物。
[4]
前記金属化合物が、有機酸金属塩である、[1]~[3]のいずれかに記載の樹脂組成物。
[5]
前記有機酸金属塩が、酢酸亜鉛またはその水和物である、[4]記載の樹脂組成物。
[6]
[1]~[5]のいずれかに記載の樹脂組成物を含有する、コーティング溶液。
[7]
[1]~[5]のいずれかに記載の樹脂組成物を含有する、フィルム。
[8]
前記フィルムの23℃、80%RH環境下における酸素透過度が、80cc・3μm/m2・day・atm以下である、[7]記載のフィルム。
[9]
前記フィルムの厚みが、0.1~20μmである、[7]又は[8]記載のフィルム。
[10]
[7]~[9]のいずれかに記載のフィルムからなるフィルム層を少なくとも一層有する多層構造体。
[11]
前記フィルム層が、[7]~[9]のいずれかに記載のフィルムを2以上積層してなるフィルム層である、[10]記載の多層構造体。
[12]
前記フィルム層の厚みが、0.1~20μmである、[10]又は[11]記載の多層構造体。
[13]
さらに、基材からなる層を少なくとも一層有する、[10]~[12]のいずれかに記載の多層構造体。
[14]
基材に[6]記載のコーティング溶液を塗工、乾燥して得られる多層構造体。
本樹脂組成物で用いる親水性樹脂の具体例としては、例えば、ビニルアルコール系樹脂、多糖類、アクリル系樹脂、ポリエーテル系樹脂等の水溶性樹脂等が挙げられる。前記親水性樹脂は、単独でもしくは2種以上を併用してもよい。
すなわち、前記親水性樹脂を用いて、厚み30μmのフィルムを調製し、25℃の水に2時間、静置浸漬した際の面積変化率が105%以上であることが好ましい。なお、前記面積変化率は、下記式により求めることができる。
面積変化率(%)=浸漬後のフィルム面積/浸漬前のフィルム面積×100
以下、具体的な親水性樹脂について、詳述する。
前記ビニルアルコール系樹脂は、通常、エチレン-ビニルアルコール共重合樹脂(エチレン含有量20~60モル%)として知られている樹脂を除くものであり、例えば、ポリビニルアルコール(以下、「PVA」と称する)系樹脂等が挙げられる。
また、前記変性PVA系樹脂は、ビニルエステル系モノマーと他の不飽和単量体との重体をケン化したり、未変性PVA樹脂を後変性したりすることにより製造することができる。
前記多糖類としては、例えば、澱粉、セルロース、N-アセチルグルコサミン誘導体等が挙げられる。
前記澱粉としては、例えば、とうもろこし澱粉、馬鈴薯澱粉等の天然澱粉や、エーテル化澱粉、エステル化澱粉、架橋澱粉、グラフト化澱粉、焙焼デキストリン、酵素変性デキストリン、アルファ化澱粉、酸化澱粉等の変性澱粉等が挙げられる。
前記セルロースとしては、例えば、カルボキシメチルセルロース、メチルセルロース、エチルセルロース、ヒドロキシメチルセルロース、ヒドロキシプロピルメチルセルロース、ヒドロキシエチルセルロース、ヒドロキシエチルメチルセルロース、ヒドロキシプロピルセルロース、ニトロセルロース、カチオン化セルロース等や、それらのナトリウム塩等の金属塩等が挙げられる。
前記N-アセチルグルコサミン誘導体としては、例えば、キチン、キトサン及びキトサン誘導体等が挙げられる。キトサン誘導体としては、例えば、ヒドロキシアルキルキトサン、カルボキシアルキルキトサン、カルボキシアシルキトサン、サクシニルキトサン、カチオン化キトサン等が挙げられる。
前記アクリル系樹脂としては、例えば、ポリアクリルアミド、ポリアクリル酸、及びそれらのナトリウム塩等の金属塩等が挙げられる。
前記ポリエーテル系樹脂としては、例えば、ポリエチレングリコール、ポリプロピレングリコール等が挙げられる。
本樹脂組成物で用いる金属化合物としては、特定の構造単位が特定の面間隔で層状となっている構造を有するものが好ましい。
Ma(OH)bAn- (2a-b)/n・・・(1)
(前記Mは金属種、Aは価数がn-のヒドロキシ配位子以外のアニオン性配位子を表す。ただし、AとしてO(オキソ配位子)は除く。nは1以上の整数であり、またa,bは0より大きい数字であり、a/b=0.1~10を満たす。)
[測定条件]
・使用機器:D8 DISCOVER(ブルカージャパン社製)
・デテクター:二次元検出器 VANTEC-500(ブルカージャパン社製)
・電圧:50kV
・電流:100mA
・カメラ長:100mm
・測定方法:反射法
・積算時間:30分間
・波長:CuKα線(Kα1、Kα2は分離せず)
・デテクター位置:2θ=10°
・X線入射角:θ=0.3°
・2θ方向一次元化の条件:2θ=0~35°、方位角(chi)=-95~-85°
・方位角方向一次元化:方位角(chi)=-180~0°
方位角方向に一次元化する際は、2θ=2~15°の範囲で最も回折強度の強いピークが含まれるように1.0°の範囲で方位角方向に一次元化する。このとき、方位角-180~0°の範囲にピークが観測された場合は、2θ=2~15°の範囲で回折ピークが観測されたと判断する。例えば、2θ=6.8°に回折ピークが観測された場合は、2θ=6.0~7.0°の範囲で方位角方向に一次元化したとき、方位角=-180~0°の範囲でピークが観測されれば、2θ=2~15°の範囲に回折ピークが観測されたと判断すればよい。
更に、前記層状の構造単位は、20℃、90%RHの環境下で1,000時間静置しても分解しないことが好ましい。
前記有機酸金属塩としては、高湿度下での酸素バリア性に優れる点から、1価のカルボン酸金属塩が好ましく、特に好ましくは酢酸金属塩であり、殊に好ましくは酢酸亜鉛又はその水和物である。
前記無機金属塩としては、高湿度下での酸素バリア性に優れる点から、金属の塩化物、オキソ酸が好ましく、特に好ましくは塩化亜鉛や硝酸亜鉛又はそれらの水和物である。
以下、各方法について詳述する。
前記(I)の方法は、金属含有化合物を塩基下で反応させる方法である。
前記(I)の方法で用いる塩基としては、例えば、アルカリ金属又はアルカリ土類金属の水酸化物等が挙げられる。なかでも、金属含有化合物との反応性に優れることから、アルカリ金属の水酸化物が好ましく、水酸化ナトリウムが特に好ましい。
前記金属含有化合物と塩基とを混合させる方法は、特に限定されないが、例えば、金属含有化合物を溶解させた溶液と、塩基を溶解させた溶液とを混合する方法、金属含有化合物を分散させたスラリー液と、塩基を溶解させた溶液とを混合する方法等が挙げられる。
なかでも、反応効率の点から、金属含有化合物を溶解させた溶液と、塩基を溶解させた溶液とを混合する方法が好ましい。更には、金属含有化合物として有機酸金属塩を用いる場合は、塩基を溶解させた溶液に、有機酸金属塩を溶解させた溶液を添加し混合する方法が好ましく、無機金属塩を用いる場合は、無機金属塩を溶解させた溶液に、塩基を溶解させた溶液を添加し混合する方法が好ましい。
また、塩基を溶媒に溶解させた溶液における塩基の濃度は、通常0.01~100mol/L、好ましくは0.1~30mol/L、特に好ましくは1~10mol/Lである。
金属含有化合物及び塩基の濃度が前記範囲よりも低すぎると、反応が充分に進行しない傾向がある。また、金属含有化合物及び塩基の濃度が前記範囲よりも高すぎると、副反応が起きる傾向がある。
また、反応時間は、通常0.5~5時間、好ましくは1~3時間であり、反応時の圧力は、常圧で行えばよい。
前記(II)の方法は、金属含有化合物を加熱して反応させる方法である。
前記(II)の方法は、通常、金属含有化合物を溶解させた溶液を撹拌しながら加熱することにより行われる。
また、反応時間は、通常0.1~10時間、好ましくは0.5~7時間、特に好ましくは1~5時間であり、反応時の圧力は、常圧で行えばよい。
また、撹拌回転速度は、通常10~5,000rpm、好ましくは100~2,500rpm、特に好ましくは300~2,000rpmである。
前記(III)の方法は、金属含有化合物を撹拌して反応させる方法である。
前記(III)の方法は、通常、金属含有化合物を溶解させた溶液を撹拌することにより行われる。
また、反応時間(撹拌時間)は、通常0.5~60分、好ましくは1~30分、特に好ましくは1~10分であり、反応時の圧力は、常圧で行えばよい。
また、撹拌回転速度は、通常100~20,000rpm、好ましくは1,000~10,000rpm、特に好ましくは2,000~8,000rpmである。
本樹脂組成物には、本発明の効果を阻害しない範囲において、一般的に樹脂組成物に配合する配合剤、例えば、熱安定剤、酸化防止剤、帯電防止剤、着色剤、紫外線吸収剤、滑剤、可塑剤、光安定剤、界面活性剤、抗菌剤、乾燥剤、アンチブロッキング剤、難燃剤、架橋剤、硬化剤、発泡剤、結晶核剤、防曇剤、生分解用添加剤、シランカップリング剤、酸素吸収剤等が含有されていてもよい。これらは単独でもしくは2種以上併せて用いることができる。
本樹脂組成物は、親水性樹脂と金属化合物を含むものである。そして、親水性樹脂の含有量と金属化合物の金属換算含有量の質量比(親水性樹脂の含有量:金属化合物の金属換算含有量)を90:10~20:80としているため、フィルムにした際の高湿度下におけるガスバリア性、特には酸素バリア性に優れたものとなる。高湿度下におけるガスバリア性、特には酸素バリア性を更に向上させる観点からは、親水性樹脂の含有量と金属化合物の金属換算含有量の質量比(親水性樹脂の含有量:金属化合物の金属換算含有量)を85:15~30:70とするのが好ましく、83:17~55:45であってもよい。かかる金属化合物の含有割合が少なすぎる場合や高すぎる場合には、高湿度下における酸素バリア性が低下する傾向がある。
なお、樹脂組成物が金属種の異なる金属化合物を複数含有する場合は、樹脂組成物に含まれる全ての金属化合物の合計量(金属換算値の合計量)を含有量とする。
また、前記金属化合物の含有量は、ICP-MSを用いた標準添加法により求めることができる。
本樹脂組成物を含有するフィルムは、本樹脂組成物を製膜して得られるフィルムである。
また、前述の金属化合物を得る方法において、金属含有化合物を反応させる際に、溶媒中に親水性樹脂を溶解させておくことも好ましく、作業性の点から、特に前記(II)の方法で金属化合物を得る場合に好ましい。
前記溶媒としては、前記金属化合物で挙げた溶媒を用いることができ、水、アルコール類が好ましく、特に好ましくは水、炭素数1~5の低級アルコールであり、更に好ましくは水、エタノールである。また、前記コーティング溶液全量に対する溶媒の含有量は、例えば、50質量%以上であり、60質量%以上、70質量%以上、80質量%以上、85質量%以上、90質量%以上等であってもよい。上限は、通常95質量%程度である。
なお、本発明において、酸素透過度は、酸素透過度率測定装置により求めることができる。
また、親水性樹脂の含有量と金属化合物の金属換算含有量の質量比(親水性樹脂の含有量:金属化合物の金属換算含有量)を、85:15~65:35とすることが好ましい。
本樹脂組成物を含有するフィルムが抗菌性に優れたものとなる原理は明らかではないが、特定の質量比で配合された親水性樹脂と金属化合物中の金属元素の相互作用によって生成した化合物から水酸化ラジカル等が発生し、抗菌性が発現するものと推測される。
なお、前記ヘイズは、JIS K7361-1の規格に準拠して測定されるHAZE値であり、例えば、フィルムから50mm×50mmの試験片を10枚切り出し、ヘイズメーター(例えば、日本電色社製 NDH-4000)を用いて測定し、10枚の平均値をイズ(%)とする。
本フィルムは、他のフィルム基材や紙基材等と積層させることにより、多層構造体としてもよい。すなわち、本フィルムからなる層(以下、「本フィルム層」という場合がある)と、フィルム基材や紙基材等の基材からなる層(以下、「基材層」という場合がある)とを有する多層構造体としてもよい。
[PVA系樹脂]
・PVA(未変性PVA樹脂、平均重合度1,700、平均ケン化度99モル%)
[多糖類]
・キトサン(富士フィルム和光純薬社製、キトサン10)
Zn(CH3COO)2・2H2Oが金属換算で5.3%含まれる水/エタノール溶液(水/エタノール比率=60/40)を作製し、当該溶液の温度が23℃の条件下において、ホモジナイザー(特殊機化工業社製、T.Kロボミクス)を用いて3500rpmで3分間撹拌処理をした。このようにして得られた金属化合物含有溶液30部と、PVAの15%水溶液70部を混合し、樹脂組成物の溶液(コーティング溶液)を調製した(固形分濃度15%)。前記により得られた樹脂組成物の溶液に含まれる各成分の質量比、及び前記により得られた樹脂組成物の溶液に含まれるPVAの含有量と金属化合物の金属換算含有量との質量比〔PVAの含有量:金属化合物の金属換算含有量〕を表1に示す。
得られた樹脂組成物の溶液を、コロナ処理をした厚み38μmのPET基材のコロナ処理面にワイヤーバー#18を使用して塗布し、120℃で5分間乾燥させ、PET基材上に厚み5.9μmのフィルム層が積層された2層フィルムを作製した。
実施例1において、金属化合物含有溶液を40部、PVAの15%水溶液を60部とし、PET基材上に積層されたフィルム層の厚みを表1の通りとした以外は実施例1と同様にして樹脂組成物の溶液を調製し(固形分濃度15%)、同様にフィルムを作製した。上により得られた樹脂組成物の溶液に含まれる各成分の質量比等を、実施例1と同様、表1に示す。
実施例1において、金属化合物含有溶液を50部、PVAの15%水溶液を50部とし、PET基材上に積層されたフィルム層の厚みを表1の通りとした以外は実施例1と同様にして樹脂組成物の溶液を調製し(固形分濃度15%)、同様にフィルムを作製した。前記により得られた樹脂組成物の溶液に含まれる各成分の質量比等を、実施例1と同様、表1に示す。
実施例1において、金属化合物含有溶液を60部、PVAの15%水溶液を40部とし、PET基材上に積層されたフィルム層の厚みを表1の通りとした以外は実施例1と同様にして樹脂組成物の溶液を調製し(固形分濃度15%)、同様にフィルムを作製した。前記により得られた樹脂組成物の溶液に含まれる各成分の質量比等を、実施例1と同様、表1に示す。
実施例1において、金属化合物含有溶液を70部、PVAの15%水溶液を30部とし、PET基材上に積層されたフィルム層の厚みを表1の通りとした以外は実施例1と同様にして樹脂組成物の溶液を調製し(固形分濃度15%)、同様にフィルムを作製した。前記により得られた樹脂組成物の溶液に含まれる各成分の質量比等を、実施例1と同様、表1に示す。
実施例1において、金属化合物含有溶液を80部、PVAの15%水溶液を20部とし、PET基材上に積層されたフィルム層の厚みを表1の通りとした以外は実施例1と同様にして樹脂組成物の溶液を調製し(固形分濃度15%)、同様にフィルムを作製した。前記により得られた樹脂組成物の溶液に含まれる各成分の質量比等を、実施例1と同様、表1に示す。
実施例1において、金属化合物含有溶液を90部、PVAの15%水溶液を10部とし、PET基材上に積層されたフィルム層の厚みを表1の通りとした以外は実施例1と同様にして樹脂組成物の溶液を調製し(固形分濃度15%)、同様にフィルムを作製した。前記により得られた樹脂組成物の溶液に含まれる各成分の質量比等を、実施例1と同様、表1に示す。
Zn(CH3COO)2・2H2Oが金属換算で5.3%含まれる水溶液を作製し、当該溶液の温度が23℃の条件下において、ホモジナイザー(特殊機化社製、T.Kロボミクス)を用いて3500rpmで3分間撹拌処理をした。この金属化合物含有溶液10部と、キトサンの3%水溶液50部を混合し、樹脂組成物の溶液(コーティング溶液)を調製した(固形分濃度5%)。前記により得られた樹脂組成物に含まれる各成分の質量比、及び前記により得られた樹脂組成物の溶液に含まれるキトサンの含有量と金属化合物の金属換算含有量との質量比〔キトサンの含有量:金属化合物の金属換算含有量〕を表1に示す。
得られた樹脂組成物の溶液を、コロナ処理をした厚み38μmのPET基材のコロナ処理面にワイヤーバー#18を使用して塗布し、80℃で5分間乾燥させ、PET基材上に厚み1μmのフィルム層が積層された2層フィルムを作製した。
実施例8において、金属化合物含有溶液を15部、キトサンの3%水溶液を50部とし、PET基材上に積層されたフィルム層の厚みを表1の通りとした以外は実施例8と同様にして樹脂組成物の溶液を調製し(固形分濃度5.7%)、同様にフィルムを作製した。
前記により得られた樹脂組成物の溶液に含まれる各成分の質量比等を、実施例8と同様、表1に示す。
実施例1において、金属化合物含有溶液を0.7部、PVAの15%水溶液を99.3部とし、PET基材上に積層されたフィルム層の厚みを表1の通りとした以外は実施例1と同様にして樹脂組成物の溶液を調製し(固形分濃度15%)、同様にフィルムを作製した。前記により得られた樹脂組成物の溶液に含まれる各成分の質量比等を、実施例1と同様、表1に示す。
実施例1において、金属化合物含有溶液を4.7部、PVAの15%水溶液を95.3部とし、PET基材上に積層されたフィルム層の厚みを表1の通りとした以外は実施例1と同様にして樹脂組成物の溶液を調製し(固形分濃度15%)、同様にフィルムを作製した。前記により得られた樹脂組成物の溶液に含まれる各成分の質量比等を、実施例1と同様、表1に示す。
実施例1において、金属化合物含有溶液を10部、PVAの15%水溶液を90部とし、PET基材上に積層されたフィルム層の厚みを表1の通りとした以外は実施例1と同様にして樹脂組成物の溶液を調製し(固形分濃度15%)、同様にフィルムを作製した。前記により得られた樹脂組成物の溶液に含まれる各成分の質量比等を、実施例1と同様、表1に示す。
実施例1において、金属化合物含有溶液を含まず、PVAの15%水溶液を100部とし、PET基材上に積層されたフィルム層の厚みを表1の通りとした以外は実施例1と同様にして樹脂組成物の溶液を調製し(固形分濃度15%)、同様にフィルムを作製した。
前記により得られた樹脂組成物の溶液に含まれる各成分の質量比等を、実施例1と同様、表1に示す。
前記で得られた実施例1~9及び比較例1~3のフィルムを下記条件で広角X線回折(XRD)測定を行った。
[測定条件]
使用機器:D8 DISCOVER(ブルカージャパン社製)
電圧:50kV
電流:100mA
カメラ長:150mm
測定方法:反射法
積算時間:20分間
また、実施例1~9及び比較例1~3のフィルムを広角X線回折で測定した際に、最もピーク強度が強かった2θ=6.8°の回折位置をもとにBraggの式から層間距離算出した結果、前記Zn含有層状化合物〔Zn5(OH)8(CH3CO2)2・2H2O〕は、層間距離1.3nmの層状化合物であった。
前記で得られた実施例及び比較例の2層フィルムから、樹脂組成物からなるフィルム層を取り出し、取り出したフィルム層の酸素透過度を、酸素透過度測定装置(OX-TRA100A、MOCON社製)を用いて、23℃、80%RHの環境下で測定した。その結果を表1に示す。
従って、本発明によれば、調湿工程を要することなく、高湿度下における酸素バリア性に優れるフィルムを得られることがわかる。
実施例2、9及び比較例4の各樹脂組成物の溶液(コーティング溶液)を、PETフィルム(太閤ポリエステルフィルムFE2001、♯38、フタムラ化学社製)上にメイヤーバーを用いて、乾燥後の膜厚が実施例2は4.6μm、実施例9は1.0μm、比較例4は3.0μmとなるように塗工し、120℃で5分間乾燥し、PETフィルム上に塗膜を形成し、抗菌試験用フィルムを得た。抗菌試験用フィルムに関して、JIS Z 2801:2010に準拠して試験を行い、Staphylococcus aureus(黄色ブドウ球菌)、及びEscherichia coli(大腸菌)に関して、以下のとおり評価した。なお、リファレンス(無加工試験片)となるフィルムとしては、PEフィルム(ポリエチレンフィルム)を用いた。その結果を表2に示す。
[評価基準]
〇(very good)・・・両方の菌に関して抗菌活性値2以上
△(good) ・・・一方の菌に関してのみ抗菌活性値2以上
×(poor) ・・・両方の菌に関しても抗菌活性値2未満
Claims (14)
- 親水性樹脂及び金属化合物を含む樹脂組成物であって、前記親水性樹脂の含有量と前記金属化合物の金属換算含有量との質量比(親水性樹脂の含有量:金属化合物の金属換算含量)が、90:10~20:80であることを特徴とする樹脂組成物。
- 前記親水性樹脂が、ポリビニルアルコ―ル系樹脂である、請求項1記載の樹脂組成物。
- 前記親水性樹脂が、多糖類である、請求項1記載の樹脂組成物。
- 前記金属化合物が、有機酸金属塩である、請求項1~3のいずれか一項に記載の樹脂組成物。
- 前記有機酸金属塩が、酢酸亜鉛またはその水和物である、請求項4記載の樹脂組成物。
- 請求項1~5のいずれか一項に記載の樹脂組成物を含有する、コーティング溶液。
- 請求項1~5のいずれか一項に記載の樹脂組成物を含有する、フィルム。
- 前記フィルムの23℃、80%RH環境下における酸素透過度が、80cc・3μm/m2・day・atm以下である、請求項7記載のフィルム。
- 前記フィルムの厚みが、0.1~20μmである、請求項7又は8記載のフィルム。
- 請求項7~9のいずれか一項に記載のフィルムからなるフィルム層を少なくとも一層有する多層構造体。
- 前記フィルム層が、請求項7~9のいずれか一項に記載のフィルムを2以上積層してなるフィルム層である、請求項10記載の多層構造体。
- 前記フィルム層の厚みが、0.1~20μmである、請求項10又は11記載の多層構造体。
- さらに、基材からなる層を少なくとも一層有する、請求項10~12のいずれか一項に記載の多層構造体。
- 基材に請求項6記載のコーティング溶液を塗工、乾燥して得られる多層構造体。
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