WO2022124101A1 - 積層体、及び、包装体又は容器 - Google Patents
積層体、及び、包装体又は容器 Download PDFInfo
- Publication number
- WO2022124101A1 WO2022124101A1 PCT/JP2021/043433 JP2021043433W WO2022124101A1 WO 2022124101 A1 WO2022124101 A1 WO 2022124101A1 JP 2021043433 W JP2021043433 W JP 2021043433W WO 2022124101 A1 WO2022124101 A1 WO 2022124101A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- resin
- layer
- tannic acid
- coat layer
- acid
- Prior art date
Links
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- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
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- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
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- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 description 1
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- 125000004079 stearyl 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])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
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- OPQYOFWUFGEMRZ-UHFFFAOYSA-N tert-butyl 2,2-dimethylpropaneperoxoate Chemical compound CC(C)(C)OOC(=O)C(C)(C)C OPQYOFWUFGEMRZ-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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- 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
- B65D81/24—Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants
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- B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
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- 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
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- 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
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
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- B32—LAYERED PRODUCTS
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- B32B2439/00—Containers; Receptacles
- B32B2439/80—Medical packaging
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/13—Phenols; Phenolates
- C08K5/134—Phenols containing ester groups
- C08K5/1345—Carboxylic esters of phenolcarboxylic acids
-
- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
- C09J2301/408—Additional features of adhesives in the form of films or foils characterized by the presence of essential components additives as essential feature of the adhesive layer
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2433/00—Presence of (meth)acrylic polymer
Definitions
- the present invention relates to a laminate and a package or container having the laminate.
- Tannin which is a kind of polyphenol, has been used as a rust preventive for a long time, and is known to form a stable film on the zinc surface, for example.
- tannin is hardly soluble in organic solvents, and its use is limited. Therefore, by substituting at least a part of the hydroxyl groups contained in the tannin molecule with an alkyl ether or an alkyl ester to obtain a water-insoluble tannic acid derivative, its use can be expanded (Patent Document 1). ..
- the above-mentioned film is a film formed by reacting gallic acid or the like in tannic acid with zinc to form a film formed by agglomerating polymerization or associative polymerization of tannic acid.
- Non-Patent Document 1 It is the hydroxyl groups such as gallic acid contained in tannic acid that are involved in these reactions. Therefore, if this hydroxyl group is changed to an alkyl ether or the like, it becomes difficult to form a film, and there is a concern that the rust preventive effect may be reduced. Also in Patent Document 1, it is evaluated exclusively in a solution state.
- a film-forming composition containing a tannin acid derivative in which a hydrogen atom at at least a part of the hydroxyl groups of tannin is replaced with a chain hydrocarbon group having 3 to 18 carbon atoms has been proposed (for example, Patent Document). 2).
- This film-forming composition has a film-forming property, and it is said that a stable film can be formed on various substrates.
- the reason is considered to be that the tannic acid derivative molecules are arranged in an orderly manner by aligning the chain hydrocarbon groups with each other.
- this orientation compensates for the decrease in hydroxyl groups and brings about the stability of the membrane, and as a result, exhibits rust prevention, antibacterial properties, bactericidal properties, etc., which are superior to those of the aggregated membrane of tannic acid.
- the packaging material is provided with a sealing layer for attaching to a container or attaching to each other, but in the case of a usage mode in which the contents and the sealing layer are in direct contact with each other, the antibacterial property contained in the sealing layer is provided. It is necessary to prevent the occurrence of contamination of the contents due to the elution of substances.
- An object of the present invention is to provide a laminate, a package or a container capable of exhibiting sufficient antibacterial properties, sterilization properties, and bactericidal properties to realize high reliability.
- At least a part of a plurality of hydroxyl groups is a chain hydrocarbon having 1 to 18 carbon atoms.
- a tannic acid derivative substituted with a hydrogen group and at least one resin selected from the group consisting of urethane resin, acrylic resin, vinyl chloride-vinyl acetate copolymer resin, polyester resin and olefin resin.
- the above-mentioned specific tannic acid derivative can be stably retained inside the resin constituting the coat layer or on the surface of the resin, and as a result, sufficient antibacterial property, sterility, and bactericidal property can be exhibited, and high reliability can be realized. I found.
- a laminate having a base material, a seal layer provided on one of the base materials, and a coat layer provided on the side opposite to the seal layer of the base material.
- the coat layer A tannic acid derivative in which at least a part of the plurality of hydroxyl groups is substituted with a chain hydrocarbon group having 1 to 18 carbon atoms.
- a package or container comprising a container body and one or more of the laminates according to any one of the above [1] to [7] attached to the container body.
- a package comprising an exterior portion formed by laminating one or a plurality of the laminates according to any one of the above [1] to [7], and an accommodating portion formed inside the exterior portion.
- Body or container
- FIG. 1 is a chemical reaction process diagram showing an example of derivatization of tannic acid.
- FIG. 2A is a cross-sectional view showing an example of a specific configuration of the laminated body according to the embodiment of the present invention.
- FIG. 2B is a cross-sectional view showing an example of another specific configuration of the laminated body according to the present embodiment.
- FIG. 3A is a cross-sectional view showing an example of a specific configuration of a package using the laminated body according to the present embodiment.
- FIG. 3B is a perspective view showing an example of a specific configuration of a container using the laminated body according to the present embodiment.
- FIG. 4 is a perspective view showing another specific example of the specific configuration of the package using the laminated body according to the present embodiment.
- FIG. 1 is a chemical reaction process diagram showing an example of derivatization of tannic acid.
- FIG. 2A is a cross-sectional view showing an example of a specific configuration of the laminated body according to the embodiment
- FIG. 5A is a perspective view showing another example of a specific configuration of a package using the laminated body according to the present embodiment.
- FIG. 5B is a cross-sectional view taken along the line I-I of FIG. 5A.
- FIG. 6 is a perspective view showing another example of a specific configuration of the container using the laminated body according to the present embodiment.
- the laminate of the present embodiment is a laminate having a base material, a seal layer provided on one of the base materials, and a coat layer provided on the side opposite to the seal layer of the base material.
- the coat layer is a copolymerization of a tannic acid derivative in which at least a part of a plurality of hydroxyl groups is substituted with a chain hydrocarbon group having 1 to 18 carbon atoms, a urethane resin, an acrylic resin, and vinyl chloride-vinyl acetate. It contains at least one resin selected from the group consisting of resins, polyester resins and olefin resins.
- the coat layer is a layer coated with a coating agent using, for example, an organic solvent as a solvent.
- This coating agent contains a tannic acid derivative in which at least a part of the plurality of hydroxyl groups is substituted with a chain hydrocarbon group having 1 to 18 carbon atoms.
- Tannin is a general term for plant components that produce polyhydric phenol by hydrolysis.Gallic acid and ellagic acid are ester-bonded to sugars such as glucose, and hydrolyzable tannin that is easily hydrolyzed by acids and enzymes, and flavanol skeleton. It is roughly classified into condensed tannins in which the compounds possessed are polymerized. Derivatization in the present disclosure is possible with any type of tannin or a mixture thereof, and it is considered that the effects of the present disclosure are exhibited. Hydrolyzable tannin is preferable, and for example, one containing tannic acid represented by the following formula (1) as a main component is derivatized.
- tannic acid has a plurality of hydroxyl groups
- the derivative in the present disclosure has a hydrogen atom in at least a part of the plurality of hydroxyl groups substituted with a chain hydrocarbon group having 1 to 18 carbon atoms.
- the total number of hydroxyl groups of the raw material tannic acid varies depending on the type. Preferably, 10% or more of the number of substituents is substituted, more preferably 20% or more, and particularly preferably 40% or more.
- the total number of hydroxyl groups is 25, of which at least one, preferably three or more, more preferably five or more, and particularly preferably ten or more are substituted.
- the upper limit of the number of substituents differs depending on the type of substituents, the base material to be applied, and the purpose of use. All hydroxyl groups may be substituted as long as the desired adhesiveness can be achieved with respect to the substrate to be used.
- 80% or less of the number of substituents is preferably substituted, and more preferably 60% or less is substituted.
- the number of hydroxyl groups to be substituted is preferably 20 or less, more preferably 15 or less.
- Examples of the chain hydrocarbon group having 1 to 18 carbon atoms include a linear or branched alkyl group, an alkenyl group, and an alkynyl group, which are bonded to the tannin acid skeleton via a bond containing an oxygen atom derived from a hydroxyl group. Will be done.
- chain hydrocarbon group examples include a butyl group, a hexyl group, a heptyl group, an octyl group, an isooctyl group, a nonyl group, an isononyl group, a decyl group, an undecyl group, a dodecyl group, a hexadecyl group, a propylene group and a hexylene group.
- Hexadecenyl groups, octadecenyl groups and the like are included.
- the number of carbon atoms of the chain hydrocarbon group is preferably 3 to 18, more preferably 4 to 18, and even more preferably 6 to 16.
- Examples of the bond containing an oxygen atom include an ether bond, an ester bond, and a urethane bond.
- the tannic acid derivative is obtained by the Williamson ether synthesis method, which is one of the alkylation reactions. Specifically, it can be produced by reacting tannic acid with an alkyl halide in the presence of a basic catalyst in a solvent such as tetrahydrofuran or dimethylsucciside.
- a basic catalyst any one or more catalysts selected from the group of MH, M 2 CO 3 , and M (M: alkali metal) can be used.
- K 2 CO 3 can convert the OH group to OM + and promote the nucleophilic reaction of the O- group to the alkyl halide (X-R1: X: halogen, R1: alkyl group). ..
- alkyl halide for example, an alkyl iodide can be used.
- alkyl halide those having a sulfonyl group or the like as a leaving group can also be used.
- an alkylation reaction other than the above-mentioned Williamson ether synthesis method can also be used.
- a dehydration condensation reaction with carboxylic acids using a condensing agent such as N, N'-dicyclohexylcarbodiimide (DCC) or a condensation reaction with isocyanate can also be used.
- FIG. 1 shows an example of derivatization of tannic acid of the formula (1).
- An example is shown in which K 2 CO 3 is used as a basic catalyst and heated to 85 ° C. in DMF to synthesize a derivative having nine decyl groups (TA (C 10 ) 9 ).
- TA nine decyl groups
- At least one resin selected from the group consisting of urethane resin, acrylic resin, vinyl chloride-vinyl acetate copolymer resin, polyester resin and olefin resin The resin contained in the coat layer is suitably used as a binder for a coating agent using an organic solvent or the like used for paper or a film as a medium.
- the urethane resin is not particularly limited as long as it is a polyurethane resin obtained by reacting a polyol with a polyisocyanate.
- the polyol for example, various known polyols generally used for producing a polyurethane resin can be used, and one kind or two or more kinds may be used in combination. For example, ethylene glycol, 1,2-propanediol, 1,3-propanediol, 2-methyl-1,3-propanediol, 2-ethyl-2butyl-1,3-propanediol, 1,3-butanediol.
- 1,4-Butanediol Neopentyl Glycol, Pentandiol, 3-Methyl-1,5 Pentandiol, Hexadiol, Octanediol, 1,4-Butindiol, 1,4-butylenediol, Diethylene Glycol, Triethylene Glycol , Dipropylene glycol, glycerin, trimethylolpropane, trimethylolethane, 1,2,6-hexanetriol, 1,2,4-butanetriol, sorbitol, pentaeslitol and other saturated or unsaturated low molecular weight polyols.
- these low-molecular-weight polyols (1) sebacic acid, adipic acid, phthalic acid, isophthalic acid, terephthalic acid, maleic acid, fumaric acid, succinic acid, oxalic acid, malonic acid, glutaric acid, and pimelli acid.
- Polyvalent carboxylic acids such as spellic acid, azelaic acid, trimellitic acid, pyromellitic acid or polyester polyols obtained by dehydration condensation or polymerization of these anhydrides (2); cyclic ester compounds such as polycaprolactone.
- Polyester polyols (3) obtained by ring-opening polymerization of lactones such as polyvalerolactone and poly ( ⁇ -methyl- ⁇ -valerolactone); the low molecular weight polyols (1) and the like, for example, dimethyl carbonate, etc.
- Polycarbonate polyols (4) obtained by reaction with diphenyl carbonate, ethylene carbonate, phosgen, etc .; polybutadiene glycols (5); glycols obtained by adding ethylene oxide or propylene oxide to bisphenol A; glycols (6); 1 molecule Acrylic obtained by copolymerizing one or more hydroxyethyl, hydroxypropurate acrylate, acrylic hydroxybutyl, etc., or their corresponding methacrylic acid derivatives, with, for example, acrylic acid, methacrylic acid, or an ester thereof. Examples thereof include polyol (7).
- polyisocyanate examples include various known aromatic diisocyanates, aliphatic diisocyanates, and alicyclic diisocyanates generally used for producing polyurethane resins.
- Aliphatic compounds such as diisocyanate or alicyclic polyisocyanates can be used. These polyisocyanates may be used alone or in combination of two or more. Among these, these diisocyanate compounds can be used alone or in combination of two or more.
- chain extender examples include ethylenediamine, propylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine, isophoronediamine, dicyclohexylmethane-4,4'-diamine, etc., as well as 2-hydroxyethylethylenediamine and 2-hydroxyethylpropyldiamine.
- 2-Hydroxyethyl propylenediamine di-2-hydroxyethylethylenediamine, di-2-hydroxyethylenediamine, di-2-hydroxyethylpropylenediamine, 2-hydroxypyrropyrethylenediamine, di-2-hydroxypyrropyrethylenediamine, di- Amines having a hydroxyl group in the molecule, such as 2-hydroxypropylethylenediamine, can also be used.
- chain extenders can be used alone or in admixture of two or more.
- a monovalent active hydrogen compound can also be used as a terminal blocking agent for the purpose of stopping the reaction.
- examples of such compounds include dialkylamines such as di-n-butylamine and alcohols such as ethanol and isopropyl alcohol.
- amino acids such as glycine and L-alanine can be used as a reaction terminator.
- These terminal blockers can be used alone or in admixture of two or more.
- the weight average molecular weight of the urethane resin is preferably 10,000 to 100,000, more preferably 15,000 to 80,000.
- the acrylic resin is not particularly limited as long as it is a copolymer of a polymerizable monomer containing a (meth) acrylic acid ester as a main component.
- the polymerizable monomer include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, n-butyl (meth) acrylate, iso-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, and n.
- -Octyl (meth) acrylate iso-octyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate, iso-nonyl (meth) acrylate, cyclohexyl (meth) acrylate, benzyl (meth) acrylate, methoxyethyl ( Examples thereof include meth) acrylate, ethoxyethyl (meth) acrylate, and phenoxyethyl (meth) acrylate.
- the polymerization method is not particularly limited, and those obtained by known bulk polymerization, solution polymerization, emulsion polymerization, suspension polymerization and the like can be used.
- the weight average molecular weight of the acrylic resin is preferably 5,000 to 200,000, more preferably 10,000 to 100,000.
- the vinyl chloride-vinyl acetate copolymer resin is not particularly limited as long as it is a copolymer of vinyl chloride and vinyl acetate.
- the molecular weight preferably has a weight average molecular weight of 5,000 to 100,000, and more preferably 10,000 to 70,000.
- the structure derived from the vinyl acetate monomer is preferably 1 to 30% by mass, and the structure derived from the vinyl chloride monomer is preferably 70 to 95% by mass in the solid content of the vinyl chloride-vinyl acetate copolymer resin in an amount of 100% by mass.
- the solubility in an organic solvent is improved, and the adhesion to the substrate, the physical characteristics of the film, the scratch resistance and the like are improved. Further, from the viewpoint of solubility in an organic solvent, those containing a hydroxyl group derived from a vinyl alcohol structure are also preferable.
- the hydroxyl value is preferably 20 mgKOH / g to 200 mgKOH / g.
- the glass transition temperature is preferably 50 ° C to 90 ° C.
- polyester resin is not particularly limited as long as it is a polyester resin obtained by reacting an alcohol and a carboxylic acid using a known esterification polymerization reaction.
- Alcohols include ethylene glycol, 1,2-propanediol, 1,3-propanediol, 2-methyl-1,3-propanediol, 2-ethyl-2butyl-1,3 propanediol, and 1,3-butane.
- the carboxylic acids include formic acid, acetic acid, propionic acid, butanoic acid, pentanoic acid, hexanoic acid, hepanoic acid, hexanoic acid, heptanic acid, octanoic acid, nonanoic acid, decanoic acid, oleic acid, linoleic acid, oxalic acid and malonic acid.
- the weight average molecular weight of the polyester resin is preferably 500 to 6000, and more preferably 1400 to 5500.
- the olefin resin includes homopolymers and copolymers of olefin monomers, copolymers of olefin monomers and other monomers, hydrides and halides of these polymers, and functional groups such as acids and hydroxyl groups.
- Examples thereof include polymers mainly composed of a hydrocarbon skeleton, such as a modified product in which the above is introduced, and one type or a combination of two or more types can be used. It is preferable to use a crystalline olefin resin having an acid group or an acid anhydride group, or a crystalline olefin resin having a hydroxyl group.
- the olefin resin having an acid group or an acid anhydride group includes an acid-modified olefin resin (E-1) which is a copolymer of an olefin-based monomer and an ethylenically unsaturated carboxylic acid or an ethylenically unsaturated carboxylic acid anhydride.
- E-1 an acid-modified olefin resin
- E-2 an acid-modified olefin resin
- Examples of the olefin-based monomer used for preparing the acid-modified olefin resin (E-1) include olefins having 2 to 8 carbon atoms, for example, ethylene, propylene, isobutylene, 1-butene, 4-methyl-1-pentene, and the like. Examples include hexene and vinylcyclohexane. Among these, olefins having 3 to 8 carbon atoms are preferable, and propylene and 1-butene are more preferable, and propylene and 1-butene are particularly used in combination with respect to the solvent because the adhesive strength is particularly good. It is preferable because it has excellent resistance and adhesive strength.
- Examples of the ethylenically unsaturated carboxylic acid or ethylenically unsaturated carboxylic acid anhydride used for copolymerization with an olefin-based monomer include acrylic acid, methacrylic acid, maleic acid, itaconic acid, citraconic acid, mesaconic acid, and maleic anhydride.
- the reactivity with the olefin-based monomer and the reactivity of the acid anhydride after the copolymerization are particularly excellent, and the molecular weight of the compound itself is small and the functional group concentration becomes high when the copolymer is formed. Therefore, maleic anhydride is preferable. These can be used alone or in combination of two or more.
- the tylene unsaturated carboxylic acid or the ethylenically unsaturated carboxylic acid anhydride in addition to the olefin-based monomer, the tylene unsaturated carboxylic acid or the ethylenically unsaturated carboxylic acid anhydride, other compounds having an ethylenically unsaturated group, for example, styrene, Ethylene, isoprene and the like may be used in combination.
- Examples of the polyolefin used for preparing the acid-modified olefin resin (E-2) include homopolymers and copolymers of olefins having 2 to 8 carbon atoms, and co-polymers of olefins having 2 to 8 carbon atoms and other monomers. Examples thereof include polymers such as high-density polyethylene (HDPE), low-density polyethylene (LDPE), and linear low-density polyethylene resin such as polyethylene, polypropylene, polyisobutylene, and poly (1-butene).
- HDPE high-density polyethylene
- LDPE low-density polyethylene
- linear low-density polyethylene resin such as polyethylene, polypropylene, polyisobutylene, and poly (1-butene).
- a homopolymer of an olefin having 3 to 8 carbon atoms and two or more copolymers of an olefin having 3 to 8 carbon atoms are preferable from the viewpoint of particularly good adhesive strength, and propylene alone is preferable.
- a polymer or a propylene / 1-butene copolymer is more preferable, and a propylene / 1-butene copolymer is particularly preferable because it has excellent resistance to a solvent and excellent adhesive strength.
- the ethylenically unsaturated carboxylic acid or ethylenically unsaturated carboxylic acid anhydride used for graft modification with polyolefin is used for copolymerization with an olefin-based monomer in the preparation of the acid-modified olefin resin (E-1) described above.
- the same ones that can be used can be used.
- Maleic anhydride is preferable because the reactivity of the functional group after the graft modification is high and the concentration of the functional group of the graft-modified polyolefin is high. These can be used alone or in combination of two or more.
- an ethylenically unsaturated carboxylic acid or an ethylenically unsaturated carboxylic acid anhydride with a polyolefin by graft modification specifically, the polyolefin is melted and the ethylenically unsaturated carboxylic acid or the ethylenically unsaturated carboxylic acid is melted therein.
- a method of adding an acid anhydride (graft monomer) to cause a graft reaction dissolving a polyolefin in a solvent to prepare a solution, and adding an ethylenically unsaturated carboxylic acid or an ethylenically unsaturated carboxylic acid anhydride to the solution to cause a graft reaction.
- a polyolefin dissolved in an organic solvent is mixed with an ethylenically unsaturated carboxylic acid or an ethylenically unsaturated carboxylic acid anhydride, heated at the softening temperature of the polyolefin or a temperature higher than the melting point, and radically polymerized and hydrogen in a molten state. Examples thereof include a method of simultaneously performing a withdrawal reaction.
- the graft reaction in the presence of a radical initiator in order to efficiently carry out the graft copolymerization of the graft monomer.
- the graft reaction is usually carried out under the condition of 60 to 350 ° C.
- the ratio of the radical initiator used is usually in the range of 0.001 to 1 part by weight with respect to 100 parts by weight of the polyolefin before denaturation.
- an organic peroxide is preferable, for example, benzoyl peroxide, dichlorbenzoyl peroxide, dicumyl peroxide, di-tert-butyl peroxide, 2,5-dimethyl-2,5-di (peroxide benzoate) hexin-3, 1,4-Bis (tert-butylperoxyisopropyl) benzene, lauroyl peroxide, tert-butylperacetate, 2,5-dimethyl-2,5-di (tert-butylperoxy) hexin-3,2,5-dimethyl- 2.5-di (tert-butylperoxy) hexane, tert-butylperbenzoate, tert-butylperphenylacetate, tert-butylperisobutyrate, tert-butylper-sec-octate, tert-butylperpivalate, k Examples thereof include milpel pi
- the optimum radical initiator may be selected according to the graft reaction process, but usually dicumyl peroxide, di-tert-butyl peroxide, 2,5-dimethyl-2,5-di (tert-butylperoxy) hexine. Dialkyl peroxides such as -3,2,5-dimethyl-2,5-di (tert-butylperoxy) hexane and 1,4-bis (tert-butylperoxyisopropyl) benzene are preferably used.
- an acid-modified olefin resin (E-1) or an acid-modified olefin resin (E-2) is used as the olefin resin (E)
- the adhesion of the metal layer is further improved and the electrolyte resistance is excellent. It is preferable to use one having an acid value of ⁇ 200 mgKOH / g.
- the olefin resin (E-3) having a hydroxyl group a copolymer of a polyolefin and a hydroxyl group-containing (meth) acrylic acid ester or a hydroxyl group-containing vinyl ether, or a hydroxyl group-containing (meth) acrylic acid ester or a hydroxyl group-containing vinyl ether grafted on the polyolefin.
- modified resins include modified resins.
- the polyolefin the same one used for preparing the olefin resin (E-2) can be used.
- the modification method the same method as the adjustment method for the acid-modified olefin resins (E-1) and (E-2) can be used.
- hydroxyl group-containing (meth) acrylic acid ester used for modification examples include hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, glycerol (meth) acrylate, lactone-modified hydroxyethyl (meth) acrylate, and polyethylene glycol mono (meth) acrylate. , Polypropylene glycol mono (meth) acrylate and the like.
- the hydroxyl group-containing vinyl ether include 2-hydroxyethyl vinyl ether, diethylene glycol monovinyl ether, 4-hydroxybutyl vinyl ether and the like.
- olefin resin (E-3) having a hydroxyl group is used as the olefin resin (E), the adhesion of the metal layer is further improved and the electrolyte resistance is excellent. Therefore, a hydroxyl group value of 1 to 200 mgKOH / g can be used. It is preferable to use the one that has.
- the olefin resin (E) the polyolefin used for preparing the acid-modified olefin resin (E-2) or the olefin resin having a hydroxyl group (E-3) described above may be used as it is without modification.
- the weight average molecular weight of the olefin resin (E) is preferably 40,000 or more in order to improve the adhesiveness. Further, in order to secure appropriate fluidity, the weight average molecular weight of the olefin resin (E) is preferably 150,000 or less.
- a curing agent capable of reacting with the reactive group can also be used in combination.
- a curing agent capable of reacting with the reactive group.
- an isocyanate-based curing agent, an epoxy-based curing agent, an amino-based curing agent, or the like can be used.
- the coat layer is preferably composed of an organic binder containing the tannic acid derivative and the resin.
- the organic binder preferably comprises the above tannic acid derivative and the above specific resin.
- the organic binder refers to a binder that does not contain or substantially does not contain an inorganic substance such as a metal or an inorganic compound.
- the content of the tannic acid derivative in the coat layer is preferably 0.1% by mass or more and 50% by mass or less, and more preferably 0.5% by mass or more and 20% by mass or less.
- the content of at least one resin selected from the group consisting of urethane resin, acrylic resin, vinyl chloride-vinyl acetate copolymer resin, polyester resin and olefin resin in the coat layer is preferably 50% by mass or more and 99.9. It is 8% by mass or less, more preferably 80% by mass or more and 99.5% by mass or less.
- the mass ratio of the tannic acid derivative and the resin contained in the coat layer is preferably 0.1: 99.9 to 50:50, more preferably 0.5: 99.5 to 20:80. be.
- the coat layer may be a layer coated with a sealing coating agent using an organic solvent, water or the like as a medium. This makes it possible to provide a coat layer having a sealing property in addition to an antibacterial property. Further, when the coat layer is arranged at a position where it can come into contact with the contents, it is possible to prevent the contents from being contaminated.
- the sealing layer is not particularly limited as long as it is a layer having a sealing property, and for example, an adhesive film or sheet such as an adhesive film, a pressure-sensitive adhesive film, or a sealant film may be used, and for example, an organic solvent or an aqueous solution may be used. It may be a coating layer of a sealing coating agent using a medium or the like as a medium.
- a polyethylene film, a polypropylene film, a polyolefin film such as an ethylene-vinyl acetate copolymer, an ionomer resin, an EAA resin, an EMA resin, an EMA resin, an EMMA resin, a biodegradable resin film and the like are preferable.
- Generic names include CPP (unstretched polypropylene) film, VMCPP (aluminum vapor-deposited unstretched polypropylene film), LLDPE (linear low-density polyethylene), LDPE (low-density polyethylene), HDPE (high-density polyethylene), VMLDPE (aluminum-deposited).
- Non-low density polyethylene film) film, film containing these pigments and the like can be mentioned.
- the surface of the film may be subjected to various surface treatments such as flame treatment, corona discharge treatment, or chemical treatment such as a primer.
- the coating layer of the sealing coating agent is preferable because it can easily contain the above-mentioned tannic acid derivative as described later.
- the resin contained in the seal layer a known resin that exhibits sealing properties is used.
- thermoplastic resin for example, a known thermoplastic resin used for heat sealing and cold sealing can be used. Specifically, a thermoplastic resin having a softening temperature of at least 40 ° C. or higher, which does not cause adhesiveness at room temperature or lower, is preferable. Further, a thermoplastic resin having a glass transition temperature of at least ⁇ 10 ° C. or higher is preferable.
- thermoplastic resin examples include polyester resin, vinyl chloride resin, vinyl chloride-vinyl acetate resin, acrylic resin, styrene-acrylic acid ester resin, styrene-butadiene resin, butadiene resin, vinyl acetate resin, and ethylene-vinyl alcohol.
- At least one resin selected from the group consisting of urethane resin, acrylic resin, vinyl chloride-vinyl acetate copolymer resin, polyester resin, ethylene-vinyl acetate copolymer resin and ethylene-vinyl alcohol copolymer resin is preferable. ..
- thermoplastic resin a main agent composed of a thermoplastic resin grafted or pendant with a reactive group such as a hydroxyl group, a glycidyl group or a carboxyl group, an isocyanate curing agent or a polyamine curing agent capable of thermally reacting with the reactive group, etc.
- a main agent such as an epoxy resin or a polyol resin grafted or pendant with a reactive group
- a curing agent such as an isocyanate curing agent or a polyamine curing agent.
- a polyol such as polyethylene glycol, an acrylic polyol, a polyester polyol, a polyether polyol, a polyester polyether polyol, a polyester polyurethane polyol, castor oil, dehydrated castor oil, and castor oil, which is a hydrogenated additive of castor oil.
- Castor oil-based polyols such as castor oil alkylene oxide 5 to 50 mol adducts and the like.
- curing agent examples include polyisocyanates having an aromatic structure in the molecular structure such as tolylene diisocyanate, diphenylmethane diisocyanate, polypeptide diphenylmethane diisocyanate, 1,5-naphthalenediocyanate, triphenylmethane triisocyanate, and xylylene diisocyanate.
- Polyfunctional isocyanates such as certain polyisocyanates, ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, hexaethyleneheptamine, heptaethyleneoctamine, octaethylenenonamine, nonaethylenedecamine, piperazine or carbon.
- polyethylene polyamines such as N-aminoalkylpiperazine having an alkyl chain having 2 to 6 atoms, and amine compounds such as 3-aminomethyl-3,5,5-trimethylcyclohexylamine (isocyanolonediamine or IPDA).
- the seal layer may contain a tannic acid derivative in which at least a part of the plurality of hydroxyl groups is substituted with a chain hydrocarbon group having 1 to 18 carbon atoms. That is, the coat layer provided on one of the base materials contains a tannic acid derivative in which at least a part of the plurality of hydroxyl groups is substituted with a chain hydrocarbon group having 1 to 18 carbon atoms, and the group is a group.
- the seal layer provided on the other side of the material may contain a tannic acid derivative in which at least a part of the plurality of hydroxyl groups is substituted with a chain hydrocarbon group having 1 to 18 carbon atoms.
- the seal layer is preferably composed of the tannic acid derivative and the organic binder containing the resin.
- the organic binder preferably comprises the above tannic acid derivative and the above resin.
- the tannic acid derivative contained in the seal layer may be the same as or different from the tannic acid derivative contained in the coat layer.
- the content of the tannic acid derivative in the seal layer is preferably 0.1% by mass or more and 50% by mass or less, and more preferably 0.5% by mass or more and 20% by mass or less.
- the mass ratio of the tannic acid derivative and the resin contained in the seal layer is preferably 0.1: 99.9 to 50:50, more preferably 0.5: 99.5 to 20:80.
- the base material is not particularly limited, and examples thereof include a paper base material, a plastic base material, and a metal foil.
- the paper base material is manufactured by a known paper machine using natural fibers for paper making such as wood pulp, but the paper making conditions are not particularly specified.
- natural fibers for papermaking include wood pulp such as coniferous tree pulp and broadleaf tree pulp, non-wood pulp such as Manila hemp pulp, sisal hemp pulp, and flax pulp, and pulp obtained by chemically modifying these pulps.
- wood pulp such as coniferous tree pulp and broadleaf tree pulp
- non-wood pulp such as Manila hemp pulp, sisal hemp pulp, and flax pulp
- pulp obtained by chemically modifying these pulps As the type of pulp, chemical pulp, gland pulp, chemi-grand pulp, thermomechanical pulp or the like obtained by a sulfate cooking method, an acidic / neutral / alkaline sulfite cooking method, a soda salt cooking method or the like can be used.
- various commercially available high-quality papers, coated papers, backing papers, impregnated papers, cardboards, paperboards and the like can also be used.
- the plastic base material may be any base material used for base materials such as plastic materials, molded products, film base materials, and packaging materials, and in particular, gravure roll coating (gravure coater) and flexorol coating (flexo coater).
- gravure roll coating gravure coater
- flexorol coating flexo coater
- polyamide resins such as nylon 6, nylon 66, and nylon 46, polyethylene terephthalate (hereinafter sometimes referred to as PET), polyethylene naphthalate, polytrimethylene terephthalate, polytrimethylene naphthalate, and polybutylene terephthalate.
- PET polyethylene terephthalate
- Polyethylene resin such as polybutylene naphthalate, polyhydroxycarboxylic acid such as polylactic acid, biodegradable resin such as aliphatic polyester resin such as poly (ethylene succinate) and poly (butylene succinate), polypropylene, polyethylene.
- Examples thereof include a film made of a thermoplastic resin such as a polyolefin resin, a polyimide resin, a polyarylate resin or a mixture thereof, and a laminate thereof.
- a film made of a thermoplastic resin such as a polyolefin resin, a polyimide resin, a polyarylate resin or a mixture thereof, and a laminate thereof.
- PET polyethylene terephthalate
- polyester polyamide
- polyethylene and polypropylene are used.
- a film can be preferably used.
- These base films may be unstretched films or stretched films, and the production method thereof is not limited.
- the thickness of the base film is not particularly limited, but usually it may be in the range of 1 ⁇ m to 500 ⁇ m.
- the base film is preferably subjected to a corona discharge treatment, and aluminum, silica, alumina or the like may be vapor-deposited.
- the metal foil is not particularly limited, and various known metal foils can be used.
- examples of the metal material of the metal foil include aluminum, gold, silver, copper, stainless steel, titanium, nickel and the like.
- copper foil or aluminum foil is preferable from the viewpoint of simplicity of the manufacturing process and cost.
- the base material is a laminated body (sometimes referred to as a laminated film) having a laminated structure in which the paper base material or the film base material is laminated by a dry laminating method, a solvent-free laminating method, or an extrusion laminating method. It doesn't matter if there is one.
- the structure of the laminate may include a metal foil, a metal vapor deposition film layer, an inorganic vapor deposition film layer, an oxygen absorption layer, an anchor coat layer, a decorative layer such as a printing layer, a varnish layer, and the like.
- the single-layer paper base material or film base material, or the laminate having a multi-layer laminated structure may be a functional film, a flexible packaging film, a shrink film, a film for daily necessities packaging, or a pharmaceutical packaging, depending on the industry and usage method.
- the above coating agent can be used without particular limitation. In this case, it is preferable that the coating agent is coated on the surface that becomes the outermost layer when the container or packaging material using them is used.
- the laminate of the present embodiment may have a decorative layer provided on the side opposite to the seal layer of the base material.
- the coat layer may constitute a decorative layer, or a decorative layer different from the coat layer may be provided.
- the decorative layer contains the tannic acid derivative.
- the decorative layer is provided, for example, between the base material and the coat layer.
- the decorative layer may be formed of a printing layer containing printing ink.
- the printing ink used for the printing layer is not particularly limited, and examples thereof include offset flat plate ink, gravure printing ink, flexographic printing ink, and inkjet printing ink.
- the laminate of the present embodiment may further have a varnish layer provided on the side opposite to the seal layer of the base material.
- the coat layer may form a varnish layer, or a varnish layer different from the coat layer may be provided.
- the varnish layer contains the tannic acid derivative.
- the varnish layer is provided on the opposite side of the coat layer from the base material, for example.
- the varnish layer may be provided on the decorative layer.
- the varnish used for the varnish layer is not particularly limited, and examples thereof include acrylic resin, polyester resin, urethane resin, cellulose, nitrocellulose, and amide.
- the laminate according to the present embodiment is, for example, (1) a step of applying a coating agent to one surface side of a base material, (2) a step of drying the coating agent to form a coat layer, and (3) a group. It can be produced by going through a step of applying a sealing agent to the other surface side of the material and (4) a step of drying the agent to form a sealing layer.
- the coating amount of the coating agent is not particularly limited, but is preferably 0.5 g / m 2 or more and 10 g / m 2 or less, and more preferably 1.0 g / m 2 or more and 5.0 g / m. It is 2 or less.
- the coating agent includes a tannic acid derivative in which at least a part of a plurality of hydroxyl groups is substituted with a chain hydrocarbon group having 1 to 18 carbon atoms, a urethane resin, an acrylic resin, a vinyl chloride-vinyl acetate copolymer resin, and the like. It contains at least one resin selected from the group consisting of polyester resin and olefin resin, and a medium.
- a solvent such as an organic solvent can be used as the medium of the coating agent.
- the solvent is not particularly limited, but is, for example, an aromatic hydrocarbon-based organic solvent such as toluene, xylene, Solbesso # 100, or Solbesso # 150, or an aliphatic hydrocarbon-based organic solvent such as hexane, methylcyclohexane, heptane, octane, or decane.
- aromatic hydrocarbon-based organic solvent such as toluene, xylene, Solbesso # 100, or Solbesso # 150
- an aliphatic hydrocarbon-based organic solvent such as hexane, methylcyclohexane, heptane, octane, or decane.
- ester-based organic solvents such as solvents, methyl acetate, ethyl acetate, isopropyl acetate, normal propyl acetate, butyl acetate, amyl acetate, ethyl formate, and but
- alcohol-based substances such as methanol, ethanol, propanol, butanol, and isopropyl alcohol
- ketone-based substances such as acetone, methyl ethyl ketone, and cyclohaxanone
- ethylene glycol (mono, di) methyl ether and ethylene glycol (mono, di) ethyl.
- Ether ethylene glycol monopropyl ether, ethylene glycol monoisopropyl ether, monobutyl ether, diethylene glycol (mono, di) methyl ether, diethylene glycol (mono, di) ethyl ether, diethylene glycol monoisopropyl ether, diethylene glycol monobutyl ether, triethylene glycol (mono, di)
- examples thereof include various glycol ether-based organic solvents such as di) methyl ether, propylene glycol (mono, di) methyl ether, propylene glycol monopropyl ether, propylene glycol monobutyl ether, and dipropylene glycol (mono, di) methyl ether. These can be used alone or in combination of two or more.
- the content of the tannic acid derivative in the coating agent of the present embodiment is preferably 0.1% by mass or more and 50% by mass or less, and more preferably 0.5% by mass or more and 20% by mass or less.
- the content of the resin in the coating agent of the present embodiment is preferably 0.1% by mass or more and 99.9% by mass or less, and more preferably 0.5% by mass or more and 99.5% by mass or less. .. (Other additives)
- the coating agent also has a curing agent, a wax, a chelate cross-linking agent, an extender pigment, a leveling agent, a defoaming agent, a plasticizer, an infrared absorber, and an ultraviolet absorbing agent for the purpose of imparting the desired basic physical properties to the coating agent. Agents, fragrances, flame retardants and the like can also be included.
- the coating agent used in the present disclosure can be produced by dissolving and / or dispersing the resin as a binder and the tannic acid derivative in an organic solvent.
- the disperser generally used, for example, a roller mill, a ball mill, a pebble mill, an attritor, a sand mill and the like can be used.
- the amount of the sealant applied is not particularly limited, but is preferably 1.0 g / m 2 or more and 10 g / m 2 or less, and more preferably 1.0 g / m 2 or more and 5.0 g / m. It is 2 or less.
- the sealing agent is not particularly limited, and contains the above-mentioned known resin exhibiting sealing properties and a medium.
- the sealing agent preferably contains a known thermoplastic resin used for heat sealing and cold sealing.
- a solvent such as an organic solvent or an aqueous medium can be used.
- solvent The organic solvent is added to dilute the sealant and facilitate coating. Specifically, highly soluble toluene, xylene, methylene chloride, tetrahydrofuran, methanol, ethanol, isopropyl alcohol, methyl acetate, ethyl acetate, n-butyl acetate, acetone, methyl ethyl ketone (MEK), cyclohexanone, toluol, xylol, n- It may be diluted with hexane, cyclohexane or the like.
- methanol, ethanol, isopropyl alcohol, methyl acetate, ethyl acetate, n-butyl acetate, acetone, methyl ethyl ketone (MEK), cyclohexanone, toluol, xylol, n-hexane, cyclohexane and the like can be mentioned.
- MEK methyl ethyl ketone
- MEK methyl ethyl ketone
- ethyl acetate and methyl ethyl ketone (MEK) are preferably used from the viewpoint of solubility, and ethyl acetate is particularly preferable. Even if only an unregulated solvent is used, the solution at low temperature is stable.
- the amount of the organic solvent used depends on the required viscosity, but is often used in the range of about 20% by mass or more and 80% by mass or less.
- the sealant may contain a tannic acid derivative in which at least a part of the plurality of hydroxyl groups is substituted with a chain hydrocarbon group having 1 to 18 carbon atoms.
- the content of the tannic acid derivative in the sealing agent is not particularly limited, but is preferably 0.1% by mass or more and 50% by mass or less, and more preferably 0.5% by mass or more and 20% by mass or less.
- the sealant contains the tannic acid derivative
- the sealant can be produced by dissolving and / or dispersing the binder resin and the tannic acid derivative in a medium.
- the disperser generally used, for example, a roller mill, a ball mill, a pebble mill, an attritor, a sand mill and the like can be used.
- the method for manufacturing the laminated body is not limited to the above steps (1) to (4) and the above order.
- a method for producing a laminate for example, first, a coating agent is applied to one surface side of the base material, and then a sealant is applied to the other surface side of the base material (step (1) and step (3). )), Then the coating agent and the sealing agent may be dried (step (2) and step (4)).
- the coating agent as the decorative layer can be applied onto the base material in the above step (1).
- a step of forming the decorative layer on one surface of the base material may be provided before the step (1). In this case, after that, a coating agent can be applied on the decorative layer and the coating agent can be dried.
- a coating agent as a varnish layer can be applied onto the base material in the above step (1).
- a step of forming a varnish layer on the coat layer may be provided after the above step (1).
- the laminate 10 includes a base material 11, a seal layer 12A provided on one side of the base material 11, and a coat layer 13 provided on the side opposite to the seal layer 12A of the base material 11.
- the coat layer 13 includes (1) a tannic acid derivative in which at least a part of a plurality of hydroxyl groups is substituted with a chain hydrocarbon group having 1 to 18 carbon atoms, and (2) a urethane resin, an acrylic resin, and vinyl chloride.
- the coat layer containing the compounds of the above (1) and (2) is also simply referred to as an “antibacterial coat layer”.
- the antibacterial coat layer 13 is provided on the entire surface of the base material 11 and is located on the outermost surface of the laminated body 10.
- the seal layer 12A is arranged on a part of the surface of the base material 11, for example, the outer edge portion of the surface of the base material 11, and can be used as a seal portion when assembling the package described later.
- the laminated body 10 has an antibacterial property provided on the side opposite to the base material 11, the seal layer 12B provided on one of the base materials 11, and the seal layer 12B of the base material 11. It may have a coat layer 13.
- the seal layer 12B is provided on the entire surface of the base material 11, and a part (outer edge portion) thereof can be used as a seal portion when assembling the package described later.
- FIG. 3A is a cross-sectional view showing an example of a specific configuration of a package using the laminated body 10 according to the present embodiment.
- the package 20 includes an exterior portion 21 formed by laminating two laminated bodies 10, and an accommodating portion 22 formed inside the exterior portion 21.
- the exterior portion 21 is configured by laminating two laminated bodies 10 in a state where the antibacterial coat layer 13 is oriented so as to be outside in the laminating direction.
- the content C can be stored in the storage unit 22, and food, pharmaceuticals, and the like are stored.
- the accommodating portion 22 may contain a gas such as air, or may be in a reduced pressure state such as vacuum.
- the laminate 10 has a base material 11, a seal layer 12C provided on one side of the base material 11, and an antibacterial coat layer 13 provided on the side opposite to the seal layer 12C of the base material 11.
- the seal layer 12C is formed, for example, by adhering two seal layers 12A provided on the two laminated bodies 10 (FIG. 2A). However, it is not necessary to provide the seal layer 12A on only one of the two laminated bodies 10 and not provide the seal layer on the other. In this case, the seal layer 12C is formed by the seal layer 12A of one of the two laminated bodies 10. By sealing the seal layer 12C, the accommodating portion 22 is isolated from the outside, and the hermetically sealed state or the hermetically sealed state of the accommodating portion 22 is maintained.
- the antibacterial coat layer 13 constitutes the outermost layer of the package 20, and the specific tannic acid derivative is held inside or on the resin surface of the antibacterial coat layer 13. According to this configuration, even when a substance such as a bacterium or a virus adheres to the antibacterial coat layer 13 due to contact with a human or the like, the antibacterial coat layer 13 can suppress the growth of the bacterium or the virus. can.
- FIG. 3B is a perspective view showing an example of a specific configuration of a container using the laminated body 10 according to the present embodiment.
- the container 30 includes a container body 31 and a laminate 10 attached to the container body 31.
- the laminate 10 has a base material 11, a seal layer 12D provided on one side of the base material 11, and an antibacterial coat layer 13 provided on the side opposite to the seal layer 12D of the base material 11.
- the seal layer 12D contains a tannic acid derivative in which at least a part of the plurality of hydroxyl groups is substituted with a chain hydrocarbon group having 1 to 18 carbon atoms.
- the seal layer containing the specific tannic acid derivative is also simply referred to as an “antibacterial seal layer”.
- the laminated body 10 constitutes a lid material for the container body 31, and is attached to the container body 31 so as to close the opening 32 of the container body 31. At this time, by sealing the antibacterial seal layer 12D, the internal space 33 is isolated from the outside, and the sealed state or the sealed state of the internal space 33 is maintained.
- the antibacterial seal layer 12D constitutes the innermost layer of the lid material, and the specific tannic acid derivative is held inside or on the resin surface of the antibacterial seal layer 12D. According to this configuration, even when the contents such as foods and pharmaceuticals contained in the internal space 33 of the container body 31 come into contact with the antibacterial seal layer 12D, the antibacterial substance contained in the seal layer is eluted. It is possible to prevent the occurrence of contamination of the contents due to the above.
- FIG. 4 is a perspective view showing another specific example of the specific configuration of the package using the laminated body 10 according to the present embodiment.
- the package 40 includes an exterior portion 41 formed by laminating a plurality of laminated bodies 10, and an accommodating portion 42 formed inside the exterior portion 41.
- the laminate 10 has a base material 11, a seal layer 12B provided on one side of the base material 11, and an antibacterial coat layer 13 provided on the side opposite to the seal layer 12B of the base material 11.
- the accommodating portion 42 is configured by, for example, a laminated body 10 located at the bottom and a laminated body located at the outer peripheral portion being bonded to each other.
- the seal layer 12B is provided on a part of the surface of the base material 11, and is arranged in the opening 43 of the exterior portion 41. After accommodating the contents in the accommodating portion 42 of the package 40, the accommodating portion 42 is isolated from the outside by heat-sealing with the opening 43 closed and the seal layers 12B in contact with each other. The sealed state or the sealed state of 42 is maintained.
- the antibacterial coat layer 13 constitutes the outermost layer of the package 40, and the specific tannic acid derivative is held inside or on the resin surface of the antibacterial coat layer 13. According to this configuration, the growth of bacteria, viruses and the like is suppressed by the antibacterial coat layer 13.
- FIG. 5A is a perspective view showing another specific example of the specific configuration of the package using the laminated body 10 according to the present embodiment
- FIG. 5B is a cross-sectional view taken along the line I-I of FIG. 5A
- the package 50 includes an exterior portion 51 formed by laminating two laminated bodies 10 and an accommodating portion 52 formed inside the exterior portion 21. ..
- the content C can be stored in the storage unit 52, and food, pharmaceuticals, and the like are stored.
- the accommodating portion 52 may contain a gas such as air, or may be in a reduced pressure state such as vacuum.
- the laminate 10 has a base material 11, an antibacterial seal layer 12E provided on one side of the base material 11, and an antibacterial coat layer 13 provided on the side opposite to the seal layer 12E of the base material 11.
- the antibacterial seal layer 12E is formed, for example, by adhering two seal layers 12A (FIG. 2B) provided on the two laminated bodies 10. However, it is not necessary to provide the seal layer 12A on only one of the two laminated bodies 10 and not provide the seal layer on the other. In this case, the antibacterial seal layer 12E is formed by the seal layer 12A of one of the two laminated bodies 10. By sealing the antibacterial seal layer 12E, the accommodating portion 52 is isolated from the outside, and the hermetically sealed state or the hermetically sealed state of the accommodating portion 52 is maintained.
- the antibacterial coat layer 13 constitutes the outermost layer of the package 20, and the specific tannic acid derivative is held inside or on the resin surface of the antibacterial coat layer 13.
- the growth of bacteria, viruses, etc. is suppressed by the antibacterial coat layer 13, and the occurrence of contamination of the content C due to the elution of the antibacterial substance contained in the antibacterial seal layer 12E is prevented. can do.
- the antibacterial coat layer 13 may constitute a decorative layer or a varnish layer.
- FIG. 6 is a perspective view showing another example of a specific configuration of the container using the laminated body 10 according to the present embodiment.
- the container 60 includes a container main body 61 and two laminated bodies 10-1 and 10-2 attached to the container main body 31.
- the laminate 10-1 includes the base material 11, the antibacterial seal layer 12D provided on one of the base materials 11, and the antibacterial coat layer 13 provided on the side opposite to the antibacterial seal layer 12D of the base material 11. And have.
- the laminated body 10-1 constitutes a lid material for the container body 61, and is attached to the container body 31 so as to close the opening 62 of the container body 61. At this time, by sealing the antibacterial seal layer 12D, the internal space 63 is isolated from the outside, and the sealed state or the sealed state of the internal space 63 is maintained.
- the antibacterial coat layer 13 of the laminated body 10-1 constitutes the outermost layer of the container 60, and the specific tannic acid derivative is held inside or on the resin surface of the antibacterial coat layer 13. Further, the antibacterial seal layer 12D constitutes the innermost layer of the container 60, and the specific tannic acid derivative is held inside or on the resin surface of the antibacterial seal layer 12D.
- the laminate 10-2 has a base material 11, a seal layer 12B provided on one side of the base material 11, and an antibacterial coat layer 13 provided on the side opposite to the seal layer 12B of the base material 11.
- the laminate 10-2 is attached to the outer surface of the container body 61, for example, the outer peripheral surface.
- the antibacterial coat layer 13 of the laminate 10-1 constitutes the outermost layer of the container 60, and the specific tannic acid derivative is held inside or on the resin surface of the antibacterial coat layer 13.
- the growth of bacteria, viruses and the like can be suppressed by the antibacterial coat layers 13 and 13 of the laminated bodies 10-1 and 10-2, and the antibacterial substance contained in the antibacterial seal layer 12D. It is possible to prevent the occurrence of contamination of the content C due to the elution of the virus.
- Resins A, B, C and E were dissolved in methyl ethyl ketone (hereinafter referred to as MEK) to prepare a resin solution having a solid content of 40%.
- Resin A Vinyl chloride-vinyl acetate copolymer resin "Solvine A manufactured by Nisshin Kagaku Co., Ltd.”
- Resin B Polyester resin "Byron GK-880 manufactured by Toyobo Co., Ltd.”
- Resin C Acrylic resin "DEGALAN (registered trademark) P74 manufactured by EVONIK”
- Resin E Urethane resin "Samplen IB-465 manufactured by Sanyo Chemical Industries, Ltd.”
- sealing agent D As the sealing coating agent, the sealing agent D was used as it was.
- Sealant D Acrylic resin "DIC Graphics A-415"
- Coating agents 1 to 8 and 15 or sealing coating agent 1 are applied to an aluminum foil of 8 ⁇ m as a base material so that the coating agent amount is 5 g / m 2 (solid content), and the temperature is 80 ° C. for 2 minutes.
- the organic solvent was volatilized to produce a laminate.
- the laminate provided with the coating layer of coating agents 1 to 8 and 15 is used for the antibacterial property test
- the laminate provided with the coating layer of the sealing agent 1 is used for the antibacterial property test, the sealing test and the package body test. board.
- Antibacterial test> Escherichia coli was used, and the test was carried out in accordance with JIS Z2801 (Escherichia coli only). The evaluation was carried out using the antibacterial activity value, which is a value indicating the difference in the logarithmic number of viable bacteria after inoculation and culture of the bacteria between the antibacterial processed product and the unprocessed product. When the antibacterial activity value was 2 or more, it was defined as "with antibacterial activity", and when the antibacterial activity value was less than 2, it was defined as "without antibacterial activity”.
- a coating agent 9 was prepared in the same manner as in Example 1 except that tannic acid not modified with alkyl was used, and a laminate was produced.
- Example 2 The coating agent 10 was used in the same manner as in Example 7 except that tannic acid that had not been alkyl-modified was used, and the content of tannic acid was changed to 0.2% by mass and the content of resin B was changed to 99.5%. Was produced to produce a laminated body.
- Example 3 The coating agent 11 was used in the same manner as in Example 8 except that tannic acid that had not been alkyl-modified was used, and the content of tannic acid was changed to 0.2% by mass and the content of resin C was changed to 99.5%. Was produced to produce a laminated body.
- Example 4 Sealing property is the same as in Example 9 except that tannic acid that has not been alkyl-modified is used, and the content of tannic acid is changed to 0.2% by mass and the content of the sealing agent D is changed to 99.5%.
- the coating agent 2 was produced to produce a laminated body.
- a coating agent 12 was prepared in the same manner as in Example 1 except that only the resin A solution was used without using tannic acid, and a laminate was produced.
- a coating agent 13 was prepared in the same manner as in Example 7 except that only the resin B solution was used without using tannic acid, and a laminate was produced.
- a coating agent 14 was prepared in the same manner as in Example 8 except that only the resin C solution was used without using tannic acid, and a laminate was produced.
- a sealing coating agent 3 was produced in the same manner as in Example 9 except that only the sealing agent D was used without using tannic acid, and a laminate was produced.
- the coating agent 15 is the same as in Example 10 except that tannic acid that has not been alkyl-modified is used, and the content of tannic acid is changed to 0.2% by mass and the content of resin E is changed to 99.5%. Was produced to produce a laminated body.
- the coating agent 16 was prepared in the same manner as in Example 10 except that only the resin E solution was used without using tannic acid, and a laminate was produced.
- a tannic acid derivative substituted with an alkyl group having 1, 6 or 18 carbon atoms was used as a vinyl chloride-vinyl acetate copolymer resin or polyester.
- the coat layer was formed by using the coating agents 1 to 8 and 10 contained in the resin, the acrylic resin, or the urethane resin, the antibacterial activity value was 2 or more. Therefore, it was found that the growth of bacteria was suppressed on the surface of the coat layer and that it had sufficient antibacterial properties.
- Example 9 when the coating layer is formed by using the sealing coating agent 1 containing the tannic acid derivative substituted with the alkyl group having 18 carbon atoms in the acrylic resin, the antibacterial activity value is 2 or more. there were. Therefore, it was found that even on the surface of the coat layer using the sealing coating agent, the growth of bacteria was suppressed and the surface had sufficient antibacterial properties. Further, in Example 9, it was found that the heat seal strength was 2N / 15 mm or more and the sealability was sufficient. In addition, the appearance of the contents after storage at room temperature for 10 days did not change, confirming the safety of the contents.
- the alkyl-modified tannic acid was contained in the vinyl chloride-vinyl acetate copolymer resin, the polyester resin, the acrylic resin, or the urethane resin.
- the coating layer was formed using the coating agents 9 to 11 and 15, the antibacterial activity value was less than 2, and bacterial growth occurred on the surface of the coating layer.
- Comparative Example 4 when the coating layer was formed by using the sealing coating agent 2 containing tannic acid which was not alkyl-modified in the acrylic resin, the antibacterial activity value was less than 2, and the bacteria on the surface of the coating layer. Proliferation was occurring.
- the coating layer was coated with coating agents 12 to 14 and 16 containing vinyl chloride-vinyl acetate copolymer resin, polyester resin, acrylic resin, or urethane resin without containing tannic acid.
- the antibacterial activity value was less than 2, and bacterial growth occurred on the surface of the coat layer.
- Comparative Example 8 when the coating layer was formed using the sealing coating agent 3 containing no tannic acid, the antibacterial activity value was less than 2, and bacterial growth occurred on the surface of the coating layer.
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Abstract
Description
本願は、2020年12月11日に、日本に出願された特願2020-206146号に基づき優先権を主張し、その内容をここに援用する。
酸誘導体を含む皮膜形成性組成物が提案されている(例えば、特許文献2)。この皮膜形成性組成物は膜形成性を有しており、種々の基材上に安定な膜を形成できるとされている。その理由としては、タンニン酸誘導体分子同士が、その鎖状炭化水素基同士を揃えるようにして並ぶことで、秩序立った配向をすると考えられる。この配向は、水酸基の減少を補って余りある膜の安定性をもたらし、その結果、タンニン酸の凝集膜よりも優れた防錆性、抗菌性、殺菌性等を発現するとされている。
[1]基材と、前記基材の一方に設けられたシール層と、前記基材の前記シール層とは反対側に設けられたコート層とを有する積層体であって、
前記コート層が、
複数の水酸基のうちの少なくとも一部が炭素原子数1~18の鎖状炭化水素基により置換されたタンニン酸誘導体と、
ウレタン樹脂、アクリル樹脂、塩化ビニル-酢酸ビニル共重合樹脂、ポリエステル樹脂及びオレフィン樹脂からなる群から選択される少なくとも1種の樹脂と、
を含有する積層体。
<積層体>
本実施形態の積層体は、基材と、前記基材の一方に設けられたシール層と、前記基材の前記シール層とは反対側に設けられたコート層とを有する積層体であって、前記コート層が、複数の水酸基のうちの少なくとも一部が炭素原子数1~18の鎖状炭化水素基により置換されたタンニン酸誘導体と、ウレタン樹脂、アクリル樹脂、塩化ビニル-酢酸ビニル共重合樹脂、ポリエステル樹脂及びオレフィン樹脂からなる群から選択される少なくとも1種の樹脂とを含有する。
コート層は、例えば有機溶剤等を溶媒とするコーティング剤がコートされてなる層である。このコーティング剤は、複数の水酸基のうちの少なくとも一部が炭素原子数1~18の鎖状炭化水素基により置換されたタンニン酸誘導体を含有している。
タンニンは、加水分解で多価フェノールを生じる植物成分の総称であり、没食子酸やエラグ酸がグルコースなどの糖にエステル結合し、酸や酵素で加水分解されやすい加水分解型タンニンと、フラバノール骨格を持つ化合物が重合した縮合型タンニンに大別される。いずれのタイプのタンニンであっても、また、それらの混合物であっても、本開示における誘導体化は可能であり、本開示の効果が奏されるものと考えられる。好ましくは加水分解型タンニンであり、例えば下記式(1)で表されるタンニン酸を主成分とするものが誘導体化される。
タンニン酸誘導体は、アルキル化反応の一つであるウィリアムソンエーテル合成法によって得られる。具体的には、テトラヒドロフラン、ジメチルスホキサイド等の溶媒中で、塩基性触媒の存在下で、タンニン酸にハロゲン化アルキルを反応させて作ることができる。塩基性触媒としてはMH、M2CO3、M(M:アルカリ金属)の群から選択されるいずれか1又は2以上の触媒を使うことができる。例えば、K2CO3は、OH基をO-M+に変換し、ハロゲン化アルキル(X-R1:X:ハロゲン、R1:アルキル基)へのO-基の求核反応を促進することができる。ハロゲン化アルキルとしては、例えば、ヨウ化アルキルを用いることができる。また、ハロゲン化アルキルの代わりに、スルホニル基などを脱離基として有するものも使用できる。また、上記、ウィリアムソンエーテル合成法以外のアルキル化反応を用いることもできる。さらに、N,N’-ジシクロヘキシルカルボジイミド(DCC)等の縮合剤を用いたカルボン酸類との脱水縮合反応や、イソシアネートとの縮合反応を用いることもできる。
コート層に含有される上記樹脂は、紙又はフィルムに使用する有機溶剤等を媒体とするコーティング剤のバインダーとして好適に使用される。
ウレタン樹脂としては、ポリオールとポリイソシアネートを反応させて得たポリウレタン樹脂であれば特に限定されない。ポリオールとしては、例えば、ポリウレタン樹脂の製造に一般的に用いられる各種公知のポリオールを用いることができ、1種又は2種以上を併用してもよい。例えば、エチレングリコール、1,2-プロパンジオール、1,3-プロパンジオール、2-メチル-1,3-プロパンジオール、2-エチル-2ブチル-1,3-プロパンジオール、1,3-ブタンジオール、1,4-ブタンジオール、ネオペンチルグリコール、ペンタンジオール、3-メチル-1,5ペンタンジオール、ヘキサンジオール、オクタンジオール、1,4-ブチンジオール、1,4―ブチレンジオール、ジエチレングリコール、トリエチレングリコール、ジプロピレングリコール、グリセリン、トリメチロールプロパン、トリメチロールエタン、1,2,6-ヘキサントリオール、1,2,4-ブタントリオール、ソルビトール、ペンタエスリトールなどの飽和または不飽和の低分子ポリオール類(1)、これらの低分子ポリオール類(1)と、セバシン酸、アジピン酸、フタル酸、イソフタル酸、テレフタル酸、マレイン酸、フマル酸、こはく酸、しゅう酸、マロン酸、グルタル酸、ピメリン酸、スペリン酸、アゼライン酸、トリメリット酸、ピロメリット酸などの多価カルボン酸あるいはこれらの無水物とを脱水縮合または重合させて得られるポリエステルポリオール類(2);環状エステル化合物、例えばポリカプロラクトン、ポリバレロラクトン、ポリ(β-メチル-γ-バレロラクトン)等のラクトン類、を開環重合して得られるポリエステルポリオール類(3);前記低分子ポリオール類(1)などと、例えばジメチルカーボネート、ジフェニルカーボネート、エチレンカーボネート、ホスゲン等との反応によって得られるポリカーボネートポリオール類(4);ポリブタジエングリコール類(5);ビスフェノールAに酸化エチレンまたは酸化プロピレンを付加して得られるグリコール類(6);1分子中に1個以上のヒドロキシエチル、アクリル酸ヒドロキシプロプル、アクリルヒドロキシブチル等、或いはこれらの対応するメタクリル酸誘導体等と、例えばアクリル酸、メタクリル酸又はそのエステルとを共重合することによって得られるアクリルポリオール(7)などが挙げられる。
ウレタン樹脂の重量平均分子量は、10,000~100,000であることが好ましく、15,000~80,000であることがより好ましい。
アクリル樹脂としては、(メタ)アクリル酸エステルを主成分とする重合性モノマーが共重合したものであれば特段限定されない。重合性モノマーとしては例えば、メチル(メタ)アクリレート、エチル(メタ)アクリレート、プロピル(メタ)アクリレート、n-ブチル(メタ)アクリレート、iso-ブチル(メタ)アクリレート、2-エチルヘキシル(メタ)アクリレート、n-オクチル(メタ)アクリレート、iso-オクチル(メタ)アクリレート、ラウリル(メタ)アクリレート、ステアリル(メタ)アクリレート、iso-ノニル(メタ)アクリレート、シクロヘキシル(メタ)アクリレート、ベンジル(メタ)アクリレート、メトキシエチル(メタ)アクリレート、エトキシエチル(メタ)アクリレート、フェノキシエチル(メタ)アクリレート等が挙げられる。重合法も特に限定なく公知の塊状重合、溶液重合、乳化重合、懸濁重合法等で得たものを使用することができる。
アクリル樹脂の重量平均分子量は、5,000~200,000であることが好ましく、より好ましくは10,000~100,000である。
塩化ビニル-酢酸ビニル共重合樹脂としては、塩化ビニルと酢酸ビニルが共重合したものであれば、特段限定されない。分子量としては重量平均分子量で5,000~100,000のものが好ましく、10,000~70,000が更に好ましい。塩化ビニル-酢酸ビニル共重合樹脂の固形分100質量%中、酢酸ビニルモノマー由来の構造は1~30質量%が好ましく、塩化ビニルモノマー由来の構造は70~95質量%であることが好ましい。この場合有機溶剤への溶解性が向上、更に基材への密着性、被膜物性、耐擦傷性等が良好となる。
また有機溶剤への溶解性の観点からビニルアルコール構造由来の水酸基を含むものも好ましい。水酸基価としては20mgKOH/g~200mgKOH/gであることが好ましい。また、ガラス転移温度は50℃~90℃であることが好ましい。
ポリエステル樹脂としては、アルコールとカルボン酸とを公知のエステル化重合反応を用いて反応させてなるポリエステル樹脂であれば特段限定されない。
アルコールとしては、エチレングリコール、1,2-プロパンジオール、1,3-プロパンジオール、2-メチル-1,3-プロパンジオール、2-エチル-2ブチル-1,3プロパンジオール、1,3-ブタンジオール、1,4-ブタンジオール、ネオペンチルグリコール、1,5-ペンタンジオール、1,2-ペンタンジオール、3-メチル-1,5-ペンタンジオール、ヘキサンジオール、オクタンジオール、1,4-ブチンジオール、1,4-ブチレンジオール、ジエチレングリコール、トリエチレングリコール、ジプロピレングリコール、グリセリン、トリメチロールプロパン、トリメチロールエタン、1,2,6-ヘキサントリオール、1,2,4-ブタントリオール、ソルビトール、ペンタエスリトール、1,4-シクロヘキサンジオール、1,2-シクロヘキサンジオール、1,4-シクロヘキサンジメタノール、1,2-シクロヘキサンジメタノール、スピログリコール、イソソルビド等が挙げられる。これらは単独で、または2種以上を混合して用いることができる。中でも多官能アルコールが好ましい。
カルボン酸としては、ギ酸、酢酸、プロピオン酸、ブタン酸、ペンタン酸、ヘキサン酸、ヘプタン酸、ヘキサン酸、ヘプタン酸、オクタン酸、ノナン酸、デカン酸、オレイン酸、リノール酸、シュウ酸、マロン酸、コハク酸、グルタル酸、アジピン酸、ピメリン酸、スベリン酸、アゼライン酸、セバシン酸、フタル酸、1,4-シクロヘキサンジカルボン酸等が挙げられる。これらは単独で、または2種以上を混合して用いることができる。中でも多官能カルボン酸が好ましい。
ポリエステル樹脂の重量平均分子量は、500~6000であることが好ましく、1400~5500であることがより好ましい。
オレフィン樹脂としては、オレフィンモノマーの単独重合体や共重合体、オレフィンモノマーと他のモノマーとの共重合体、これら重合体の水素化物やハロゲン化物、酸や水酸基等の官能基を導入した変性体等、炭化水素骨格を主体とする重合体が挙げられ、1種または2種以上を組み合わせて用いることができる。酸基又は酸無水物基を有する結晶性オレフィン樹脂、水酸基を有する結晶性オレフィン樹脂を用いることが好ましい。
水酸基含有ビニルエーテルとしては、2-ヒドロキシエチルビニルエーテル、ジエチレングリコールモノビニルエーテル、4-ヒドロキシブチルビニルエーテル等が挙げられる。
本開示で使用する前記樹脂が水酸基やカルボキシル基等、アミノ基、エポキシ基等の反応性基を有する場合は、当該反応性基と反応しうる硬化剤を併用することもできる。例えば、イソシアネート系硬化剤やエポキシ系硬化剤やアミノ系硬化剤等を使用することができる。
シール層は、シール性を有する層であれば特に限定されず、例えば粘着フィルムや感圧接着フィルム、シーラントフィルム等の粘着性を有するフィルムやシートを利用してもよいし、例えば有機溶剤や水性媒体等を媒体とするシール性のコーティング剤の塗工層であってもよい。
上記樹脂としては、例えば、ヒートシール、コールドシールに使用される公知の熱可塑性樹脂を使用することができる。具体的には、室温以下では粘着性を生じない、軟化温度が少なくとも40℃以上の熱可塑性樹脂が好ましい。またガラス転移温度は少なくとも-10℃以上の熱可塑性樹脂が好ましい。
シール層は、複数の水酸基のうちの少なくとも一部が炭素原子数1~18の鎖状炭化水素基により置換されたタンニン酸誘導体を含有していてもよい。すなわち、基材の一方に設けられたコート層が、複数の水酸基のうちの少なくとも一部が炭素原子数1~18の鎖状炭化水素基により置換されたタンニン酸誘導体を含有し、且つ、基材の他方に設けられたシール層が、複数の水酸基のうちの少なくとも一部が炭素原子数1~18の鎖状炭化水素基により置換されたタンニン酸誘導体を含有していてもよい。
基材は、特に制限されないが、例えば紙基材やプラスチック基材、金属箔等が挙げられる。
紙基材は、木材パルプ等の製紙用天然繊維を用いて公知の抄紙機にて製造されるが、その抄紙条件は特に規定されるものではない。製紙用天然繊維としては、針葉樹パルプ、広葉樹パルプ等の木材パルプ、マニラ麻パルプ、サイザル麻パルプ、亜麻パルプ等の非木材パルプ、およびそれらのパルプに化学変性を施したパルプ等が挙げられる。パルプの種類としては、硫酸塩蒸解法、酸性・中性・アルカリ性亜硫酸塩蒸解法、ソーダ塩蒸解法等による化学パルプ、グランドパルプ、ケミグランドパルプ、サーモメカニカルパルプ等を使用することができる。
また、市販の各種上質紙やコート紙、裏打ち紙、含浸紙、ボール紙や板紙などを用いることもできる。
プラスチック基材は、プラスチック材料、成形品、フィルム基材、包装材等の基材に使用される基材であればよいが、特に、グラビアロールコーティング(グラビアコーター)、フレキソロールコーティング(フレキソコーター)を使用する場合には、グラビア・フレキソ印刷分野で通常使用されているフィルム基材をそのまま使用できる。
金属箔は、特に限定されず、公知の種々の金属箔を使用できる。例えば、金属箔の金属材料としては、アルミニウム、金、銀、銅、ステンレス、チタン、ニッケル等が挙げられる。これらの中でも製造工程の簡便さやコストの観点から、銅箔またはアルミニウム箔が好ましい。
(F)/(P)/(AD)/(F)、
(F)/(P)/(AD)/(F)/(AD)/(F)、
(F)/(P)/(AD)/(M)/(AD)/(F)、
(F)/(P)/(AD)/(M)、
(F)/(P)/(AD)/(F)/(AD)/(M)/(AD)/(F)、
(F)/(P)/(AD)/(M)/(AD)/(F)/(AD)/(F)、
(M)/(P)/(AD)/(M)、
(M)/(P)/(AD)/(F)/(AD)/(M)、
(P)/(F)
(P)/(F)/(P)
(P)/(F)/(AD)/(F)、
(P)/(F)/(AD)/(F)/(AD)/(F)
(F)/(P)/(F)/(AD2)
(F)/(P)/(AD2)
(F)/(P)/(AD)/(M)/(AD2)
本実施形態の積層体は、上記基材のシール層とは反対側に設けられた加飾層を有していてもよい。この場合、上記コート層が加飾層を構成していてもよいし、コート層とは別の加飾層が設けられてもよい。上記コート層が加飾層を構成する場合、加飾層が上記タンニン酸誘導体を含有する。コート層とは別の加飾層が設けられる場合、加飾層は、例えば上記基材と上記コート層の間に設けられる。
また、本実施形態の積層体は、上記基材のシール層とは反対側に設けられたニス層を更に有していてもよい。この場合、上記コート層がニス層を構成してもよいし、コート層とは別のニス層が設けられてもよい。上記コート層がニス層を構成する場合、ニス層が上記タンニン酸誘導体を含有する。コート層とは別のニス層が設けられる場合、ニス層は、例えば上記コート層の上記基材とは反対側に設けられる。また、上記コート層が加飾層を構成する場合、ニス層が加飾層上に設けられてもよい。
本実施形態に係る積層体は、例えば(1)基材の一方の面側にコーティング剤を塗工する工程、(2)前記コーティング剤を乾燥させてコート層を形成する工程、(3)基材の他方の面側にシール剤を塗工する工程、及び(4)前記剤を乾燥させてシール層を形成する工程を経ることにより、製造することができる。
コーティング剤は、複数の水酸基のうちの少なくとも一部が炭素原子数1~18の鎖状炭化水素基により置換されたタンニン酸誘導体と、ウレタン樹脂、アクリル樹脂、塩化ビニル-酢酸ビニル共重合樹脂、ポリエステル樹脂及びオレフィン樹脂からなる群から選択される少なくとも1種の樹脂と、媒体とを含有する。コーティング剤の媒体としては、有機溶剤等の溶剤が使用できる。
溶剤としては、特に制限はないが、たとえばトルエン、キシレン、ソルベッソ#100、ソルベッソ#150等の芳香族炭化水素系有機溶剤、ヘキサン、メチルシクロヘキサン、ヘプタン、オクタン、デカン等の脂肪族炭化水素系有機溶剤、酢酸メチル、酢酸エチル、酢酸イソプロピル、酢酸ノルマルプロピル、酢酸ブチル、酢酸アミル、ギ酸エチル、プロピオン酸ブチル等のエステル系の各種有機溶剤が挙げられる。また水混和性有機溶剤としてメタノール、エタノール、プロパノール、ブタノール、イソプロピルアルコール等のアルコール系、アセトン、メチルエチルケトン、シクロハキサノン等のケトン系、エチレングリコール(モノ,ジ)メチルエーテル、エチレングリコール(モノ,ジ)エチルエーテル、エチレングリコールモノプロピルエーテル、エチレングリコールモノイソプロピルエーテル、モノブチルエーテル、ジエチレングリコール(モノ,ジ)メチルエーテル、ジエチレングリコール(モノ,ジ)エチルエーテル、ジエチレングリコールモノイソプロピルエーテル、ジエチレングリコールモノブチルエーテル、トリエチレングリコール(モノ,ジ)メチルエーテル、プロピレングリコール(モノ,ジ)メチルエーテル、プロピレングリコールモノプロピルエーテル、プロピレングリコールモノブチルエーテル、ジプロピレングリコール(モノ,ジ)メチルエーテル等のグリコールエーテル系の各種有機溶剤が挙げられる。これらを単独または2種以上を混合しても用いることができる。
(その他の添加剤)
コーティング剤は、その他、コーティング剤に所望される基本物性を付与することを目的として、硬化剤、ワックス、キレート架橋剤、体質顔料、レベリング剤、消泡剤、可塑剤、赤外線吸収剤、紫外線吸収剤、芳香剤、難燃剤なども含むこともできる。
本開示で使用する前記コーティング剤は、バインダーとしての前記樹脂と前記タンニン酸誘導体を有機溶剤中に溶解及び/又は分散することにより製造することができる。分散機としては、一般に使用される、例えば、ローラーミル、ボールミル、ペブルミル、アトライター、サンドミルなどを用いることができる。
シール剤は、特に制限されず、シール性を発現する上述の公知の樹脂と、媒体とを含有する。シール剤は、ヒートシール、コールドシールに使用される公知の熱可塑性樹脂を含有するのが好ましい。シール剤の媒体としては、有機溶剤等の溶剤、或いは水性媒体が使用できる。
有機溶剤は、シール剤を希釈し塗工しやすくするために添加される。具体的には溶解性の高いトルエン、キシレン、塩化メチレン、テトラヒドロフラン、メタノール、エタノール、イソプロピルアルコール、酢酸メチル、酢酸エチル、酢酸n-ブチル、アセトン、メチルエチルケトン(MEK)、シクロヘキサノン、トルオール、キシロール、n-ヘキサン、シクロヘキサン等を使用して希釈してもよい。近年の溶剤規制の観点からは、メタノール、エタノール、イソプロピルアルコール、酢酸メチル、酢酸エチル、酢酸n-ブチル、アセトン、メチルエチルケトン(MEK)、シクロヘキサノン、トルオール、キシロール、n-ヘキサン、シクロヘキサン等が挙げられる。これらの中でも溶解性の点から酢酸エチルやメチルエチルケトン(MEK)が好ましく用いられ、特に酢酸エチルが好ましい。規制を受けない溶剤だけを用いても、低温時の溶液が安定している。有機溶剤の使用量は所要される粘度によるが概ね20質量%以上80質量%以下の範囲で使用することが多い。
シール剤が上記タンニン酸誘導体を含有する場合、シール剤は、上記バインダー樹脂と上記タンニン酸誘導体を媒体中に溶解及び/又は分散することにより製造することができる。分散機としては、一般に使用される、例えば、ローラーミル、ボールミル、ペブルミル、アトライター、サンドミルなどを用いることができる。
図2A及び図2Bは、本実施形態に係る積層体の具体的構成の一例を示す断面図である。
図2Aに示すように、積層体10は、基材11と、基材11の一方に設けられたシール層12Aと、基材11のシール層12Aとは反対側に設けられたコート層13とを有する。コート層13は、(1)複数の水酸基のうちの少なくとも一部が炭素原子数1~18の鎖状炭化水素基により置換されたタンニン酸誘導体と、(2)ウレタン樹脂、アクリル樹脂、塩化ビニル-酢酸ビニル共重合樹脂、ポリエステル樹脂及びオレフィン樹脂からなる群から選択される少なくとも1種の樹脂とを含有する。以下、上記(1)及び(2)の化合物を含有するコート層を、単に「抗菌性コート層」とも称する。
図3Aに示すように、包装体20は、積層体10の2枚を貼り合わせて構成される外装部21と、外装部21の内側に形成された収容部22とを備えている。ここで、外装部21は、2枚の積層体10を、それぞれの抗菌性コート層13が積層方向外側となる向きにした状態で貼り合わせて構成される。収容部22には内容物Cが収容可能であり、食品、医薬品などが収容される。収容部22は、空気などの気体を含んでいてもよいし、真空などの減圧状態であってもよい。
図3Bに示すように、容器30は、容器本体31と、容器本体31に取り付けられた積層体10とを備える。
積層体10は、基材11と、基材11の一方に設けられたシール層12Dと、基材11のシール層12Dとは反対側に設けられた抗菌性コート層13とを有する。シール層12Dは、複数の水酸基のうちの少なくとも一部が炭素原子数1~18の鎖状炭化水素基により置換されたタンニン酸誘導体を含有する。以下、上記特定のタンニン酸誘導体を含有するシール層を、単に「抗菌性シール層」とも称する。
図4に示すように、包装体40は、積層体10の複数枚を貼り合わせて構成される外装部41と、外装部41の内側に形成された収容部42とを備えている。積層体10は、基材11と、基材11の一方に設けられたシール層12Bと、基材11のシール層12Bとは反対側に設けられた抗菌性コート層13とを有する。収容部42は、例えば底部に位置する積層体10と、外周部に位置する積層体とが貼り合わされて構成されている。
図5A及び図5Bに示すように、包装体50は、積層体10の2枚を貼り合わせて構成される外装部51と、外装部21の内側に形成された収容部52とを備えている。収容部52には内容物Cが収容可能であり、食品、医薬品などが収容される。収容部52は、空気などの気体を含んでいてもよいし、真空などの減圧状態であってもよい。
図6に示すように、容器60は、容器本体61と、容器本体31に取り付けられた2つの積層体10-1,10-2とを備える。
[合成例1]
タンニン酸(東京化成社製)を35部とし、ヨウ化n-メチル65部をN,N-ジメチルホルムアミド(以下DMFと称す)に溶解し、63部の炭酸カリウムを加え、85℃ 10時間反応した。その後、DMFを減圧蒸留、水洗、乾燥工程を経た炭素原子数1のアルキル基が5当量(置換基数の20%)置換されたタンニン酸誘導体(TA1-5)を得た。尚、合成例1~6では、全ての材料に東京化成社製のものを使用し、合成を行った。
タンニン酸を62部とし、ヨウ化n-ヘキシル38部をDMFに溶解し、25部の炭酸カリウムを加え、85℃ 10時間反応した。その後、DMFを減圧蒸留、水洗、乾燥工程を経た炭素原子数6のアルキル基が5当量置換されたタンニン酸誘導体(TA6-5)を得た。
タンニン酸を35部とし、ヨウ化n-オクタデカン65部をDMFに溶解し、24部の炭酸カリウムを加え、85℃ 10時間反応した。その後、DMFを減圧蒸留、水洗、乾燥工程を経た炭素原子数18のアルキル基が5当量置換されたタンニン酸誘導体(TA18-5)を得た。
タンニン酸を37部とし、ヨウ化n-メチル63部をDMFに溶解し、61部の炭酸カリウムを加え、85℃ 10時間反応した。その後、DMFを減圧蒸留、水洗、乾燥工程を経た炭素原子数1のアルキル基が20当量(置換基数の75%)置換されたタンニン酸誘導体(TA1-20)を得た。
タンニン酸を29部とし、ヨウ化n-ヘキシル71部をDMFに溶解し、46部の炭酸カリウムを加え、85℃ 10時間反応した。その後、DMFを減圧蒸留、水洗、乾燥工程を経た炭素原子数6のアルキル基が20当量置換されたタンニン酸誘導体(TA6-20)を得た。
タンニン酸を28部とし、ヨウ化n-オクタデカン82部をDMFに溶解し、30部の炭酸カリウムを加え、85℃ 10時間反応した。その後、DMFを減圧蒸留、水洗、乾燥工程を経た炭素原子数18のアルキル基が20当量置換されたタンニン酸誘導体(TA18-20)を得た。
樹脂A、B、C、Eをメチルエチルケトン(以下MEKと称す)に溶解し、固形分40%の樹脂溶液を製造した。
樹脂A:塩化ビニル-酢酸ビニル共重合樹脂「日信化学社製 ソルバインA」
樹脂B:ポリエステル樹脂「東洋紡社製 バイロンGK-880」
樹脂C:アクリル樹脂「EVONIK社製 DEGALAN(登録商標) P74」
樹脂E:ウレタン樹脂「三洋化成社製 サンプレンIB-465」
シール剤D:アクリル樹脂「DICグラフィックス社製 ディックシール A-415」
(積層体の製造)
コーティング剤1~8、15あるいはシール性コーティング剤1を、基材である8μmのアルミ箔に、コーティング剤量5g/m2(固形分)になるように塗工し、80℃、2分間で有機溶剤を揮発させ、積層体を製造した。
抗菌試験として、大腸菌を用い、JIS Z2801(大腸菌のみ)に準拠して試験を実施した。評価は、抗菌加工製品と無加工製品とにおける細菌を接種培養後の生菌数の対数値の差を示す値である抗菌活性値で実施した。抗菌活性値が2以上である場合を「抗菌性有り」、抗菌活性値が2未満である場合を「抗菌性無し」とした。
熱傾斜式ヒートシールテスター(テスター産業社製)を用い、シール温度150℃で圧力1kg/cm2、1秒間で、シール性コーティング剤によるシール層同士をヒートシールした。サンプル幅を15mmとし、引張り速度200mm/minでシール強度を測定し、これをヒートシール強度とした。ヒートシール強度が2N/15mm以上である場合を「合格」とした。
ディックドライLX-470EL及びSP-60(DICグラフィックス社製)を1:1に配合した2液型反応性接着剤を使用し、20μmのOPPフィルムと30μmのCPPフィルムとを、固形分塗布量2.0g/m2で塗布しラミネートした。このラミネートフィルムに対し、CPPフィルム側にシール性コーティング剤を全面に塗工し、有機溶剤を乾燥してシール層を作製した。該シール層を内側になるように折り曲げ、1atm、150℃、1秒間でシール層同士をヒートシールして、内容物の接触部分が200cm2となる包装体(パウチ)を製造した。
得られた包装体にナチュラルチーズを充填し、室温で10日間保存後の内容物の外観の変化の有無を確認し、経時で外観が変化していない場合を「合格」とした。
アルキル変性していないタンニン酸を用いたこと以外は、実施例1と同様にしてコーティング剤9を作製し、積層体を製造した。
アルキル変性していないタンニン酸を用い、且つタンニン酸の含有量を0.2質量%及び樹脂Bの含有量を99.5%に変更したこと以外は、実施例7と同様にしてコーティング剤10を作製し、積層体を製造した。
アルキル変性していないタンニン酸を用い、且つタンニン酸の含有量を0.2質量%及び樹脂Cの含有量を99.5%に変更したこと以外は、実施例8と同様にしてコーティング剤11を作製し、積層体を製造した。
アルキル変性していないタンニン酸を用い、且つタンニン酸の含有量を0.2質量%及びシール剤Dの含有量を99.5%に変更したこと以外は、実施例9と同様にしてシール性コーティング剤2を作製し、積層体を製造した。
タンニン酸を用いずに樹脂A溶液のみとしたこと以外は、実施例1と同様にしてコーティング剤12を作製し、積層体を製造した。
タンニン酸を用いずに樹脂B溶液のみとしたこと以外は、実施例7と同様にしてコーティング剤13を作製し、積層体を製造した。
タンニン酸を用いずに樹脂C溶液のみとしたこと以外は、実施例8と同様にしてコーティング剤14を作製し、積層体を製造した。
タンニン酸を用いずにシール剤Dのみとしたこと以外は、実施例9と同様にしてシール性コーティング剤3を作製し、積層体を製造した。
アルキル変性していないタンニン酸を用い、且つタンニン酸の含有量を0.2質量%及び樹脂Eの含有量を99.5%に変更したこと以外は、実施例10と同様にしてコーティング剤15を作製し、積層体を製造した。
タンニン酸を用いずに樹脂E溶液のみとしたこと以外は、実施例10と同様にしてコーティング剤16を作製し、積層体を製造した。
更に実施例9では、ヒートシール強度が2N/15mm以上であり、十分なシール性を有していることが分かった。また、室温で10日間保存後の内容物の外観が変化しておらず、内容物の安全性が確認された。
また、比較例4では、アルキル変性していないタンニン酸をアクリル樹脂に含有させたシール性コーティング剤2を用いてコート層を形成すると、抗菌活性値が2未満であり、コート層表面において細菌の増殖が発生していた。
比較例8では、タンニン酸を含有しないシール性コーティング剤3を用いてコート層を形成すると、抗菌活性値が2未満であり、コート層表面において細菌の増殖が発生していた。
10-1 積層体
10-2 積層体
11 基材
12A シール層
12B シール層
12C シール層
12D シール層(抗菌性シール層)
12E シール層(抗菌性シール層)
13 コート層(抗菌性コート層)
20 包装体
21 外装部
22 収容部
30 容器
31 容器本体
32 開口部
33 内部空間
40 包装体
41 外装部
42 収容部
43 開口部
50 包装体
51 外装部
52 収容部
60 容器
61 容器本体
62 開口部
63 内部空間
Claims (11)
- 基材と、前記基材の一方に設けられたシール層と、前記基材の前記シール層とは反対側に設けられたコート層とを有する積層体であって、
前記コート層が、
複数の水酸基のうちの少なくとも一部が炭素原子数1~18の鎖状炭化水素基により置換されたタンニン酸誘導体と、
ウレタン樹脂、アクリル樹脂、塩化ビニル-酢酸ビニル共重合樹脂、ポリエステル樹脂及びオレフィン樹脂からなる群から選択される少なくとも1種の樹脂と、
を含有する積層体。 - 前記コート層が、前記タンニン酸誘導体及び前記樹脂を含む有機物バインダーで構成される、請求項1に記載の積層体。
- 前記コート層が、加飾層を構成している、請求項1又は2に記載の積層体。
- 前記加飾層は、印刷インキを含有する印刷層で形成されている、請求項3に記載の積層体。
- 前記コート層が、シール性のコーティング剤が塗工された層である、請求項3に記載の積層体。
- 前記シール層が、複数の水酸基のうちの少なくとも一部が炭素原子数1~18の鎖状炭化水素基により置換されたタンニン酸誘導体を含有する、請求項1に記載の積層体。
- 前記シール層が、前記タンニン酸誘導体及び樹脂を含む有機物バインダーで構成される、請求項6に記載の積層体。
- 容器本体と、前記容器本体に取り付けられた請求項1~7のいずれか1項に記載の積層体の一又は複数とを備える、包装体又は容器。
- 前記積層体が、前記容器本体の蓋材を構成する、請求項8に記載の包装体又は容器。
- 前記積層体が、前記容器本体の外面に取り付けられる、請求項8に記載の包装体又は容器。
- 請求項1~7のいずれか1項に記載の積層体の一又は複数を貼り合わせて構成される外装部と、前記外装部の内側に形成された収容部と、を備える包装体又は容器。
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