WO2017006917A1 - 樹脂組成物およびその用途 - Google Patents
樹脂組成物およびその用途 Download PDFInfo
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- WO2017006917A1 WO2017006917A1 PCT/JP2016/069807 JP2016069807W WO2017006917A1 WO 2017006917 A1 WO2017006917 A1 WO 2017006917A1 JP 2016069807 W JP2016069807 W JP 2016069807W WO 2017006917 A1 WO2017006917 A1 WO 2017006917A1
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- ethylene
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- resin composition
- copolymer
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Classifications
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- 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
-
- 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
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- 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
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/40—Applications of laminates for particular packaging purposes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
- B65D77/10—Container closures formed after filling
- B65D77/20—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers
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- 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
- C08L101/12—Compositions of unspecified macromolecular compounds characterised by physical features, e.g. anisotropy, viscosity or electrical conductivity
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L25/00—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 aromatic carbocyclic ring; Compositions of derivatives of such polymers
- C08L25/02—Homopolymers or copolymers of hydrocarbons
- C08L25/04—Homopolymers or copolymers of styrene
- C08L25/06—Polystyrene
Definitions
- the present invention relates to a resin composition for sealant, a lid material containing the sealant resin composition, and a food container having the lid material.
- Plastic containers with easy-open lids are widely used as various food and pharmaceutical containers such as jelly, pudding, yogurt, tofu, instant noodles, and noodles.
- containers for instant noodles in cups, noodles, soup flour, etc. there are a wide range of containers made of expanded polystyrene sheets or those with impact-resistant polystyrene films bonded to them, impact-resistant polystyrene sheets, polyethylene laminated paper, etc. It is used.
- Various sealing materials have been proposed and put to practical use so as to be hermetically sealed in an easy-open manner as sealing materials used for the lids of these plastic containers.
- a composition mainly composed of a copolymer of ethylene and vinyl acetate or ethylene and an acrylate ester or a polyolefin resin has a relatively good sealing property between the container body and the lid, and when the lid is peeled off. It is widely used because its peel strength is generally reasonable.
- Patent Document 1 discloses an easy release containing a tackifier and a resin selected from a metal layer, an adhesive layer, an ethylene-vinyl acetate copolymer resin, an ethylene-acrylate copolymer resin, and a polyolefin resin. It is described that the laminated body which laminated
- a sealing agent comprising a composition containing ethylene- (meth) acrylic acid copolymer, polyolefin, tackifying resin and filler in a specific ratio is peelable while being stronger than a known sealing agent. Providing a seal is described.
- an object of the present invention is to provide a material for a sealant that can provide a sealing property and a good opening property required for a lid for a food container and that satisfies a stricter hygiene standard than before with a small amount of solvent extraction. .
- a resin composition comprising a specific ethylene copolymer as a main component, and an ethylene / ⁇ -olefin copolymer and a tackifying resin blended in a specific amount ratio satisfies the above problems, and a sealant material for food containers.
- the present invention is as follows.
- the resin composition for sealant of Invention 1. (Invention 2) Furthermore, 60 masses of ethylene / unsaturated carboxylic acid ester copolymer resin (D) satisfying the following general formula (2) with respect to a total of 100 mass parts of resin (A), resin (B), and resin (C).
- the resin composition of the present invention is a resin composition for a sealant suitable for heat sealing between a food container body and a lid material.
- the resin composition for a sealant of the present invention is obtained by blending predetermined components, that is, the resin (A), the resin (B), the resin (C), and the resin (D), which is an optional component, at a specific ratio. This makes it possible to achieve both excellent adhesion and extremely high hygiene.
- a food container having a good balance between easy adhesion and easy opening and high hygiene is obtained. It is done.
- the resin composition of the present invention includes 90 to 95 mol% of ethylene units and 5 to 10 mol% of vinyl ester units, which are obtained by copolymerizing a vinyl ester monomer and ethylene at a specific ratio. It is obtained by copolymerizing ethylene / vinyl ester copolymer (however, the total of ethylene units and vinyl ester units is 100 mol%), and unsaturated carboxylic acid ester monomer and ethylene at a specific ratio.
- An ethylene / unsaturated carboxylic acid containing 90 to 95 mol% of ethylene units, 5 to 10 mol% of unsaturated carboxylic acid ester units, and having a specific melting point with the unsaturated carboxylic acid ester unit At least one resin (A) selected from ester copolymers, ethylene / ⁇ -olefin copolymers, and AB At least a kind of the resin (B) selected from A-type block copolymer, a tackifying resin (C), by blending in a specific ratio.
- the resin (A) contained in the resin composition for sealant of the present invention is at least one resin selected from an ethylene / vinyl ester copolymer and an ethylene / unsaturated carboxylic acid ester copolymer satisfying the following general formula (1). It is. -3.0X + 107> T (1) (In the formula (1), X represents unsaturated carboxylic acid ester content (mol%), T represents melting point (° C.) measured according to JIS K7121-1987) The lower limit value of T is preferably ⁇ 3.0X + 87.
- the vinyl ester is, for example, vinyl acetate or vinyl propionate, preferably vinyl acetate.
- the ethylene / vinyl ester copolymer used in the present invention has an ethylene unit of 90 mol% to 95 mol%, preferably 90 mol% to 93 mol%, and a vinyl ester unit of 5 mol% to 10 mol%, preferably Contains 7 mol% or more and 10 mol% or less (however, the total of ethylene units and vinyl ester units is 100 mol%).
- the ethylene / vinyl ester copolymer may be a multi-component copolymer obtained by copolymerizing two types of the vinyl ester with ethylene, and further a vinyl ester copolymer.
- other polar monomers such as acrylic acid, methacrylic acid, maleic acid, itaconic acid, maleic anhydride are used as long as they do not substantially change various properties such as flexibility, elasticity, and heat sealability.
- it may be obtained by copolymerizing a small amount of itaconic anhydride or carbon monoxide.
- An ethylene / vinyl ester copolymer satisfying the following general formula (1 ′) is more preferred from the viewpoint of solvent extraction.
- ⁇ 3.0X ′ + 107> T ′ (1 ′) (In formula (1 ′), X ′ represents the vinyl ester content (mol%), and T ′ represents the melting point (° C.) measured according to JIS K7121-1987).
- the lower limit value of T ′ is preferably ⁇ 3.0X + 87.
- the ethylene / vinyl ester copolymer as described above is produced by radical copolymerization of ethylene and vinyl ester under high temperature and high pressure according to a conventional method. It can be produced by either an autoclave method or a tubular method. An ethylene / vinyl ester copolymer satisfying the above formula (1 ′) can be produced by a high-pressure radical polymerization process by an autoclave method.
- the above unsaturated carboxylic acid ester is an alkyl ester having up to about 20 carbon atoms of unsaturated carboxylic acid such as acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid and the like.
- the ethylene / unsaturated carboxylic acid ester copolymer used in the present invention has an ethylene unit of 90 mol% or more and 95 mol% or less, preferably 90 mol% or more and 93 mol% or less, and an unsaturated carboxylic acid ester unit of 5 mol% or more.
- the ethylene / unsaturated carboxylic acid ester copolymer satisfying the formula (1) can be obtained by a high-pressure radical polymerization process by an autoclave method.
- the ethylene / unsaturated carboxylic acid ester copolymer satisfying the above formula (1) is a multi-component copolymer obtained by copolymerizing two or more of the carboxylic acid esters with ethylene in addition to the binary copolymer.
- other polar monomers such as, for example, ethylene / unsaturated carboxylic acid ester copolymer, as long as it does not substantially change various properties such as flexibility, elasticity, heat sealability, etc.
- Acrylic acid, methacrylic acid, maleic acid, itaconic acid, maleic anhydride, itaconic anhydride, carbon monoxide and the like may be copolymerized in a small amount.
- the content of the vinyl ester unit or the unsaturated carboxylic acid ester unit is within this range, the balance between the adhesiveness and hygiene of the resin composition for sealant is excellent.
- the content of the vinyl ester unit or the unsaturated carboxylic acid ester unit is lower than 5 mol%, the adhesive strength of the resin composition for sealant is lowered, which may be a problem for the sealing performance of the container. If the content of vinyl ester units or unsaturated carboxylic acid ester units exceeds 10 mol%, the adhesive strength is high but blocking phenomenon is likely to occur, which may be undesirable for the handleability of processed products obtained from the resin composition for sealants. is there.
- the resin (A) contained in the resin composition for a sealant of the present invention exhibits appropriate fluidity.
- the melt flow rate (measured at MFR, 190 ° C., 2160 g load) of the ethylene / vinyl ester copolymer and the ethylene / unsaturated carboxylic acid ester copolymer is generally 1 g / 10 min to 50 g / 10 min. It is preferably 10 g / 10 min or more, more preferably 14 g / 10 min or more. If the MFR of the resin (A) is extremely low, it may be difficult to laminate the resin composition on the base material and process it into a sheet-like material such as a lid material.
- the resin (A) of the present invention may contain at least one selected from the above-mentioned ethylene / vinyl ester copolymers and ethylene / unsaturated carboxylic acid ester copolymers, and may contain two or more ethylene / vinyl esters.
- a vinyl ester copolymer or a mixture of two or more ethylene / unsaturated carboxylic acid ester copolymers may be used.
- the content of vinyl ester units or unsaturated carboxylic acid ester units in the mixture is The MFR of the mixture is preferably in the above range.
- an ethylene / vinyl ester copolymer (A1) having a relatively low MFR and an ethylene / vinyl ester copolymer (A2) having a relatively high MFR can be used in combination.
- An ethylene / unsaturated carboxylic acid ester copolymer (A1 ′) having a relatively low MFR as an ethylene / unsaturated carboxylic acid ester copolymer, and an ethylene / unsaturated carboxylic acid ester (A2 ′) having a relatively high MFR ) Can also be used in combination.
- the ethylene unit contains 90 mol% or more and 95 mol% or less
- the vinyl ester unit contains 5 mol% or more and 10 mol% or less
- the MFR is 1 g / 10 min or more and 50 g / 10 min or less.
- the ethylene-vinyl ester copolymer (A1) of preferably 5 g / 10 min to 30 g / 10 min, more preferably 7 g / 10 min to 25 g / 10 min, and 90 to 95 mol% of ethylene units.
- the vinyl ester unit is contained in an amount of 5 mol% to 10 mol%, and the MFR is 80 g / 10 min to 300 g / 10 min, preferably 100 g / 10 min to 250 g / 10 min, more preferably 120 g / 10 min.
- the ethylene / vinyl ester copolymer (A2) of 250 g / 10 min or less is preferably 1: 9 to 9: 1 (mass ratio (A1) :( A )), More preferably 5: 5-8: it can be used in combination with a second ratio.
- the ethylene unit contains 90 mol% or more and 95 mol% or less
- the unsaturated carboxylic acid ester unit contains 5 mol% or more and 10 mol% or less
- the MFR is 1 g / 10 min or more.
- the unit contains 90 mol% or more and 95 mol% or less, the unsaturated carboxylic acid ester unit contains 5 mol% or more and 10 mol% or less, and the MFR is 80 g / 10 min or more and 300 g / 10 min or less, preferably 100 g / 10 min or more and 250 g / min.
- the resin (A) may be any other combination of (A1) and (A2 ′) or (A1 ′) and (A2).
- Resin (B) of the resin composition for sealant of the present invention is an ethylene / ⁇ -olefin copolymer obtained by copolymerizing ethylene and an ⁇ -olefin having 3 to 18 carbon atoms, preferably 4 to 10 carbon atoms, and It is at least one resin selected from an ABA type block copolymer (A represents a polystyrene block and B represents an alkylene copolymer block).
- the ethylene / ⁇ -olefin copolymer is, for example, ethylene and an ⁇ -olefin other than ethylene, such as propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 1-dodecene, 4 -A copolymer with one or more ⁇ -olefins selected from methyl-1-pentene.
- the ethylene / ⁇ -olefin copolymer used as the resin (B) in the present invention preferably has a density of 850 kg / m 3 or more and 910 kg / m 3 or less, more preferably 870 kg / m 3 or more 900 kg / m 3 or less of ethylene ⁇ alpha-olefin copolymer.
- the MFR (190 ° C., 2160 g load) of the ethylene / ⁇ -olefin copolymer used in the present invention is generally 1 g / 10 min to 100 g / 10 min, preferably 1 g / 10 min to 60 g / 10 min, more preferably Is 1 g / 10 min or more and 20 g / 10 min or less.
- the ethylene / ⁇ -olefin copolymer as described above is a heterogeneous olefin polymerization catalyst such as a highly active Ziegler Natta catalyst and a Philips catalyst composed of a highly active titanium catalyst component and an organoaluminum compound, and a homogeneous olefin such as a metallocene catalyst. It is produced by copolymerizing ethylene and the above ⁇ -olefin by a process such as a gas phase method, a solution method, a high pressure method, or a slurry method using a polymerization catalyst.
- A represents a styrene polymer block
- B represents an alkylene copolymer block.
- alkylene copolymer block examples include an ethylene / butene copolymer block and an ethylene / propylene copolymer block.
- block copolymers are obtained by hydrogenating butadiene polymer units or isoprene polymer units of styrene-butadiene-styrene block copolymers or styrene-isoprene-styrene block copolymers, generally SEBS or It is called SEPS.
- the content of the styrene polymer block is preferably 1% by mass to 40% by mass, more preferably 5% by mass to 30% by mass with respect to the total mass of the ABA type block copolymer. is there.
- the melt flow rate (MFR) at 230 ° C. under a load of 2160 g of the ABA type block copolymer is preferably 0.1 g / 10 min to 500 g / 10 min, more preferably 1 g / 10 min. ⁇ 100 g / 10 min.
- the MFR of the ABA type block copolymer is a value measured at 230 ° C. and a load of 5000 g by a method in accordance with JIS K7210-1999.
- Specific examples of the ABA type block copolymer include Clayton G1657 manufactured by Kraton Japan, Tuftec H1221 manufactured by Asahi Kasei Chemicals, and the like.
- a resin (B) of the present invention one kind of the above-mentioned ethylene / ⁇ -olefin copolymer may be used, or a mixture of two or more kinds of ethylene / ⁇ -olefin copolymers may be used.
- the density or MFR of the mixture is preferably within the predetermined range.
- one of the above-mentioned ABA type block copolymers may be used, or a mixture of two or more types of ABA type block copolymers may be used. May be.
- a mixture comprising at least one ethylene / ⁇ -olefin copolymer and at least one ABA block copolymer may be used.
- the resin (C) that may be contained in a certain amount or less in the resin composition for sealant of the present invention is a tackifying resin.
- Resin (C) can be selected from resins having a function of imparting tackiness, preferably alicyclic hydrocarbon resins, aromatic hydrocarbon resins, aliphatic hydrocarbon resins, polyterpene resins, rosins, styrene It is selected from a series resin.
- alicyclic hydrocarbon resins examples include resins obtained by cyclization and dimerization of spent C4 and C5 fractions, resins obtained by polymerizing cyclic monomers such as cyclopentadiene, or hydrogenated products thereof, aromatics This is a resin obtained by intranuclear hydrogenation of a hydrocarbon resin or an aliphatic / aromatic copolymer hydrocarbon resin. Even if the unsaturated double bonds in the resin are partially hydrogenated alicyclic hydrocarbon resins (partially hydrogenated petroleum resins), all of the unsaturated double bonds in the resin are hydrogenated. Any of the produced alicyclic hydrocarbon resins (fully hydrogenated petroleum resins) may be used.
- aromatic hydrocarbon resin a resin obtained by polymerizing a fraction containing at least one unsaturated aromatic hydrocarbon having 3 to 10 carbon atoms such as vinyltoluene, isopropenyltoluene, indene, ⁇ -methylstyrene, Resins obtained by copolymerizing these fractions and aliphatic hydrocarbon fractions are used without limitation.
- the aliphatic hydrocarbon resin is, for example, a polymer mainly composed of olefin or diene having 4 to 5 carbon atoms.
- the polyterpene resin include polymers such as ⁇ -pinene, ⁇ -pinene, and dipentene, terpene / phenol resins, and hydrogenated terpene resins.
- the rosins are, for example, rosin, polymerized rosin, hydrogenated rosin, rosin ester, hydrogenated product or polymer thereof.
- the styrenic resin examples include polymers such as styrene, vinyltoluene, ⁇ -methylstyrene, isopropenyltoluene, and low molecular weight polymers such as a copolymer thereof.
- resin (C) hydrogenated petroleum resin is preferable among the above examples when color tone, odor, food hygiene, etc. are considered important as the performance of the resin composition of the present invention.
- the resin composition for a sealant of the present invention is obtained by blending the above resins (A), (B), and (C) at a specific amount ratio. That is, 50 to 99 parts by mass of the resin (A), 1 to 50 parts by mass of the resin (B), and 0 to 10 parts by mass of the resin (C). However, the total amount of (A), (B), and (C) is 100 parts by mass.
- the resin composition of the present invention is preferably 60 to 95 parts by mass of the resin (A), 5 to 40 parts by mass of the resin (B), 0 to 10 parts by mass of the resin (C), more preferably the resin (A).
- resin (B) 70 to 95 parts by mass, resin (B) 5 to 30 parts by mass, resin (C) 0.5 to 8 parts by mass, more preferably resin (A) 70 to 95 parts by mass, resin (B) 5 to 20 parts by mass and resin (C) at a ratio of 1.0 to 5 parts by mass.
- the adhesive strength of the resin composition for sealant is not preferable. If the blending amount of the resin (B) exceeds 50 parts by mass, the processability of the resin composition for sealant is reduced, or the amount of solvent extraction is increased, resulting in poor food hygiene. When the compounding amount of the tackifying resin (C) exceeds 10 parts by mass, the adhesive strength of the resin composition for sealant is high, but the solvent extract is increased and the food hygiene is inferior.
- the resin composition for sealant of the present invention may further contain an ethylene / unsaturated carboxylic acid ester copolymer resin satisfying the general formula (2) in addition to the resins (A), (B), and (C). it can.
- the ethylene / unsaturated carboxylic acid ester copolymer (hereinafter referred to as resin (D)) in the present embodiment is a copolymer of ethylene and an unsaturated carboxylic acid alkyl ester.
- Examples of the unsaturated carboxylic acid alkyl ester include alkyl esters of up to about 20 carbon atoms of unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, fumaric acid, and itaconic acid.
- Examples of the alkyl ester of acrylic acid or methacrylic acid include methyl acrylate, ethyl acrylate, isopropyl acrylate, npropyl acrylate, isopropyl acrylate, isobutyl acrylate, nbutyl acrylate, 2-ethylhexyl acrylate, methacrylic acid.
- Examples include ethyl acid, n-propyl methacrylate, isopropyl methacrylate, isobutyl methacrylate, n-butyl methacrylate, dimethyl maleate, diethyl maleate and the like.
- (meth) acrylic acid alkyl ester having an alkyl ester having 2 or more and 4 or less carbon atoms is preferable from the viewpoint of availability, performance and price.
- Examples of such preferable copolymer (D) include ethylene-ethyl acrylate copolymer, ethylene-n-propyl acrylate copolymer, ethylene-isopropyl acrylate copolymer, ethylene-n-butyl acrylate copolymer. , Ethylene-isobutyl acrylate copolymer, ethylene-ethyl methacrylate copolymer, ethylene-n-propyl methacrylate copolymer, ethylene-isopropyl methacrylate copolymer, ethylene-n-butyl methacrylate copolymer, ethylene- Examples thereof include an isobutyl methacrylate copolymer.
- the copolymer (D) in this embodiment is a random binary copolymer, but a copolymer obtained by copolymerizing a plurality of (meth) acrylic acid alkyl esters with ethylene is also included in the category of the random binary copolymer. to go into.
- the copolymer (D) satisfies the following formula (2) with respect to its melting point T (° C.) (based on JIS K7121-1987) and unsaturated carboxylic acid ester unit content (X mol%).
- T melting point
- T melting point
- X mol% unsaturated carboxylic acid ester unit content
- the copolymer (D) can be obtained by a high-pressure radical polymerization process using a tubular method. For example, ethylene gas and the total amount of (meth) acrylic acid alkyl ester monomer and organic peroxide are introduced from the inlet of the tubular reactor, and the average reaction temperature in the reactor is set in the range of 150 to 250 ° C. When polymerization is performed, a copolymer (D) satisfying the above formula (2) is obtained. Since the reactivity of ethylene and (meth) acrylic acid alkyl ester is different, the concentration of the (meth) acrylic acid alkyl ester monomer in ethylene gas varies between the inlet and outlet in the tubular reactor.
- the (meth) acrylic acid alkyl ester monomer concentration in the ethylene gas is high at the inlet portion and low at the outlet portion, and a copolymer having a high (meth) acrylic acid alkyl ester content and a low copolymer are mixed.
- a copolymer having a low (meth) acrylic acid alkyl ester content gives a higher melting point and heat resistance. Therefore, when the average value of the (meth) acrylic acid alkyl ester content of the copolymer is the same, the copolymer obtained by the tubular method has a higher melting point than the autoclave method, and therefore satisfies the above formula.
- Resin (D) can be obtained.
- Resin (D) may be a binary copolymer, a multi-component copolymer obtained by copolymerizing two or more of the above unsaturated carboxylic acid esters with ethylene, and an unsaturated carboxylic acid ester copolymer.
- the polymer inherently has other polar monomers such as acrylic acid, methacrylic acid, maleic acid, itaconic acid, anhydrous, as long as the properties such as flexibility, elasticity, heat sealability, etc. are not substantially changed.
- Maleic acid, itaconic anhydride, carbon monoxide, or the like may be copolymerized in a small amount.
- the unsaturated carboxylic acid ester unit constituting the resin (D) is generally in the range of 1 to 22 mol%, preferably 5 to 14 mol%, with the total of ethylene units and unsaturated carboxylic acid ester units being 100 mol%. It is in.
- the MFR (190 ° C., 2160 g load) of the resin (D) used in the present invention is preferably in the range of 2 to 50 g / 10 min from the viewpoint of the adhesive seal strength of the resulting sealant composition, and further from the workability and the like. And particularly preferably 3 to 20 g / 10 min.
- the (meth) acrylic acid alkyl ester unit content X in the above formula (2) is the same as the (meth) acrylic acid alkyl ester. It is measured by the assigned infrared absorption spectrum (IR). For example, in the case of ethyl acrylate (EA), it is determined from the absorbance at 860 cm ⁇ 1 attributed to EA. However, the calibration curve is obtained by obtaining the EA concentration by nuclear magnetic resonance spectrum (NMR) and correlating with the absorbance of IR at 860 cm ⁇ 1 .
- the calculation method of X in formula (1) and X ′ in formula (1 ′) is also the same as the above calculation method example of X.
- the resin composition for sealant of the present invention is preferably 1 part by mass or more and 60 parts by mass or less of the resin (D) with respect to a total of 100 parts by mass of the resin (A), the resin (B), and the resin (C). More preferably 5 to 30 parts by mass, still more preferably 8 to 30 parts by mass. If the blending amount of the resin (D) exceeds 60 parts by mass, the adhesive strength of the resin composition is high, but the solvent extract is increased and the food hygiene is inferior.
- one of the above-mentioned ethylene / unsaturated carboxylic acid ester copolymers may be used, or a mixture of two or more ethylene / unsaturated carboxylic acid ester copolymers is used. May be.
- the content of the mixture may be in the predetermined range, and the MFR of the mixture is preferably in the above range.
- the resin composition for sealant of the present invention can contain other resins as long as the properties of the composition are not impaired.
- various additives can be further mix
- processing aids such as antioxidants, ultraviolet absorbers, light stabilizers, heat stabilizers, pigments, dyes, antistatic agents, lubricants and release agents.
- the sealant resin composition of the present invention is produced by mixing the resin (A), (B), (C) and, if necessary, the resin (D) and the optional component simultaneously or sequentially.
- the mixing method follows a regular method. For example, it is preferable to melt and mix using a single screw extruder, a twin screw extruder, a Banbury mixer, various kneaders, etc., and the mixing order is not particularly limited.
- the melt mixing temperature is preferably 140 ° C to 230 ° C.
- the resin composition for sealant of the present invention has an MFR (190 ° C., 2160 g load) of 0.1 to 100 g / 10 minutes, preferably about 1 to 30 g / 10 minutes. It is desirable to be prepared.
- the resin composition for sealant of the present invention is suitable as a sealant material for plastic containers.
- the lid material having the layer made of the resin composition of the present invention and the container body are usually heat-sealed according to a conventional method.
- the lid material is preferably formed by molding a multilayer laminate including a layer made of the resin composition for sealant and a lid base material in the present invention.
- lid cover base material
- Paper an aluminum board (for example, aluminum foil), a nonwoven fabric, polyester, polyethylene, polypropylene, polystyrene (for example, impact-resistant polystyrene), aluminum vapor deposition polyester, aluminum vapor deposition polypropylene, silica vapor deposition polyester Etc.
- the lid substrate may be a single layer or a laminate of two or more layers.
- the thickness of the lid base material layer is not particularly limited, but is generally about 1 to 500 ⁇ m, preferably 10 to 200 ⁇ m.
- the resin composition for sealant of the present invention When laminating the resin composition for sealant of the present invention on a lid base material, a method of making a film from the resin composition in advance by a casting method or an inflation method, and bonding the lid base material by a dry lamination method, the resin composition Adopting a method of extrusion coating the product directly on the lid substrate, a method of using polyethylene or the like as the adhesive layer, laminating through the adhesive layer by sandwich lamination, co-extrusion of the lid substrate and the resin composition, etc. Can do.
- the thickness of the layer made of the resin composition for sealant of the present invention is not particularly limited, but is generally about 1 to 500 ⁇ m, preferably 10 to 200 ⁇ m.
- the material of the plastic container body examples include polyolefins such as polyethylene and polypropylene, styrene polymers such as polystyrene and impact polystyrene, polyesters such as polyethylene terephthalate, polycarbonate, and polyvinyl chloride. Such a material may be in the form of a foam.
- styrene polymers such as polystyrene and impact polystyrene
- polyesters such as polyethylene terephthalate, polycarbonate, and polyvinyl chloride.
- Such a material may be in the form of a foam.
- impact-resistant polystyrene is generally used as a container body for instant foods, and has good adhesion to the resin composition for sealant of the present invention.
- an impact-resistant polystyrene container or a container made of a material containing impact-resistant polystyrene is preferable.
- the container body may be a single layer or a laminate of two or more layers.
- One of the characteristics of the resin composition for sealants of the present invention is that the amount of solvent extraction is small even when measured under stricter conditions than before, and it has higher hygiene.
- stricter measurement conditions than the conventional conditions for example, using a 300 cm 2 film-like sealant as a sample, 600 ml of n-hexane was brought into contact with one side of the sample at room temperature for 2 hours, and the sample was eluted in the n-hexane.
- a method for measuring the weight can be mentioned.
- the resin composition for sealant of the present invention has an actual elution amount measured by this method example of preferably 30 mg or less, more preferably 20 mg or less.
- the main body of the container and the lid material are bonded with a certain degree of appropriate strength so that the container is sufficiently sealed and the container user can open the container without difficulty.
- the resin composition for sealant of the present invention is useful for such a food container.
- This peel strength is, for example, a multilayer material obtained by heat-sealing a lid material including a sealant layer made of the resin composition for a sealant of the present invention and a lid base material, and a plastic layer constituting the container body via the sealant layer.
- the test piece having a width of 15 mm cut out from the test piece can be measured as the maximum stress when the both surfaces are pulled in the horizontal opposite direction and peeled off (180 ° peeling).
- the peel strength measured by such a method is preferably in the range of 5 N / 15 mm to 15 N / 15 mm, more preferably 7 N / 15 mm to 14 N / 15 mm.
- the resin composition for sealant of the present invention is one in which the occurrence of blocking is suppressed by optimizing the composition. For this reason, the multilayer film which has the resin composition for sealants of this invention as a sealant layer does not produce a blocking, or even if it arises, it will remain in a slight grade.
- a multilayer film comprising a sealant layer comprising a resin composition for a sealant according to the present invention and a substrate are laminated in the order of a sealant layer / a lid substrate in the order of 6 sheets, and aged for 2 days in an atmosphere of 40 ° C. under a load of 5 kgf / cm 2.
- the blocking strength between the test pieces is preferably less than 100 g / 50 mm, more preferably less than 10 g / 50 mm.
- melt flow rate was measured at 190 ° C. under a load of 2160 g in accordance with JIS K7210-1999.
- Examples 1 to 6, Comparative Examples 1 to 7 The following resins were mixed at the blending ratios shown in Tables 1 and 2 so that the charged amount was 10 kg.
- EVA1 Ethylene / vinyl acetate copolymer Ethylene unit content 92.9 mol%, vinyl acetate unit content 7.1 mol%, MFR (190 ° C., 2160 g load) 15 g / 10 min, melting point 84 ° C.
- EVA2 Ethylene / vinyl acetate copolymer Ethylene unit content 92.9 mol%, vinyl acetate unit content 7.1 mol%, MFR (190 ° C., 2160 g load) 150 g / 10 min, melting point 79 ° C. Manufactured by high pressure radical polymerization by autoclave method.
- EVA3 ethylene-vinyl acetate copolymer Ethylene unit content 96.5 mol%, vinyl acetate unit content 3.5 mol%, MFR (190 ° C, 2160 g load) 9 g / 10 min, melting point 94 ° C. Manufactured by high pressure radical polymerization by autoclave method.
- EVA4 Ethylene / vinyl acetate copolymer Ethylene unit content 88.8 mol%, vinyl acetate unit content 11.2 mol%, MFR (190 ° C., 2160 g load) 15 g / 10 min, melting point 71 ° C. Manufactured by high pressure radical polymerization by autoclave method.
- PO-1 an ethylene / butene random copolymer elastomer MFR (190 ° C., 2160 g load) manufactured by Mitsui Chemicals, Inc. 3.7 g / 10 minutes, density 885 kg / m 3 .
- PO-2 Mitsui Chemicals ethylene / hexene random copolymer MFR (190 ° C., 2160 g load) 3.7 g / 10 min density 905 kg / m 3 .
- SEBS Styrene / Ethylene / Butylene / Styrene Block Copolymer “Clayton G1657” manufactured by Kraton Japan. MFR (230 ° C., 5000 g load) 22 g / 10 min, density 900 kg / m 3 .
- Tackifying resin A product made by Arakawa Chemical Co., a fully hydrogenated aromatic hydrocarbon resin. Ring and ball softening point 115 ° C.
- EMA Ethylene / methyl acrylate copolymer Ethylene unit content 92.5 mol%, methyl acrylate unit content 7.5 mol%, MFR (190 ° C., 2160 g load) 8 g / 10 min, melting point 92 ° C.
- Production method Manufactured by high-pressure radical polymerization by a tubular method.
- EMAA ethylene / methacrylic acid copolymer, ethylene unit content 96.1 mol%, methacrylic acid unit content 3.9 mol%, MFR (190 ° C., 2160 g load) 8 g / 10 min.
- the obtained resin composition was evaluated from the following viewpoints.
- Adhesive strength to HIPS The obtained resin composition was subjected to an extrusion lamination method with a processing temperature of 240 ° C. and a processing speed of 30 m / min by using a polyethylene terephthalate layer (PET), a polyethylene layer (PE), and a methacrylic acid unit content of 3.9 mol% of ethylene.
- a methacrylic acid copolymer layer (EMAA) was laminated.
- a laminate having a configuration of PET (12 ⁇ m) / PE (15 ⁇ m) / EMAA (20 ⁇ m) / resin composition (10 ⁇ m) in which PET, PE, EMAA, and a resin composition were laminated in this order was obtained.
- This laminate was heat-sealed on a commercially available HIPS sheet having a thickness of 0.4 mm under the conditions of a pressing force of 0.2 MPa, a heating temperature of 120 ° C., and a heating time of 1.0 second, and left at room temperature for 24 hours. Thereafter, both sides of a 15 mm-wide test piece cut out from the laminate were pulled in the opposite direction (with a peeling direction of 180 ° C.) to obtain the maximum stress.
- This maximum stress (N / 15 mm) was defined as the HIPS adhesive strength (N / 15 mm) of the resin composition at a heat seal temperature of 120 ° C. Measurement was performed in the same manner as the above conditions except that the heat seal temperature was changed, and the adhesive strength of the resin composition to HIPS at the heat seal temperatures of 140 ° C and 160 ° C was also determined. The measurement results are shown in Tables 1 and 2.
- the adhesion strength to HIPS was determined according to the following criteria. The determination results are shown in Tables 1 and 2.
- D Fail. Less than 3N / 15mm or more than 20N / 15mm.
- the anti-blocking strength was determined according to the following criteria. Here, the sample judged to be excellent is more difficult to cause the blocking phenomenon. Tables 1 and 2 show the determination results regarding blocking properties. A: Particularly good. Less than 10g / 50mm. -B: Good. 10 g / 50 mm or more and less than 100 g / 50 mm. ⁇ C: Bad. 100g / 50mm or more.
- the obtained solvent extraction amount (mg) was determined according to the following criteria. The determination results are shown in Tables 1 and 2. A: Particularly good. 20 mg or less. -B: Good. More than 20 mg and 30 mg or less. -C: Fail. > 30 mg. -: Not measured.
- Comparative Examples 1, 2, and 3 using an ethylene / vinyl acetate copolymer with a small amount of vinyl acetate units the adhesive strength against HIPS is low and sufficient container sealing performance cannot be expected.
- the comparative example 4 which does not use resin (A) has a large blocking tendency, and the amount of solvent extraction is high, and the desired hygiene cannot be obtained.
- Comparative Example 5 using an ethylene / vinyl acetate copolymer with an excessive amount of vinyl acetate units the solvent extraction amount and the blocking tendency are large, and it is expected that there are problems in hygiene, handling of the lid material, and processability. .
- Comparative Example 6 in which the amount of the resin (A) is too small the processability is extremely poor.
- Comparative Example 7 not containing the resin (B) had a lower adhesive strength to HIPS than Comparative Example 1.
- the resin composition for sealant of the comparative example has problems in any of adhesiveness, solvent extraction amount, and processability, and is not suitable for practical use.
- the resin compositions for sealants of the examples show moderate adhesion to HIPS over a wide temperature range, and the amount of solvent extraction is extremely low.
- the resin composition for sealants of an Example has a low blocking tendency, and is excellent also in the utilization property as a heat seal layer of a cover material.
- the resin composition for sealant of an Example is equipped with the adhesiveness which can open a container favorably, hygiene, and workability with sufficient balance.
- the resin composition for sealant of the present invention can be expected as a next-generation sealant material that can be used for heat sealing containers that require higher hygiene and safety.
- the container to which the resin composition for sealant of the present invention can be applied may be any container as long as the container main body and the lid material are bonded by heat sealing.
- a container composed of a container main body and a lid made of impact-resistant polystyrene or a material mainly composed thereof is preferable in that the container can be opened without difficulty.
- the food container is suitable because there is a low risk of component transfer from the heat-sealing resin composition of the present invention to the food product.
- Examples of food containers using the resin composition for sealants of the present invention include snacks, cereals, jelly, pudding, yogurt, tofu, prepared dishes, instant foods (eg instant noodles, instant soups), beverages, fresh foods or their Examples include processed products.
- the resin composition for sealant of the present invention has a high practical value even in countries and regions where strict hygiene standards are established by food containers.
Abstract
Description
エチレン単位を90モル%以上95モル%以下、ビニルエステル単位を5モル%以上10モル%以下含むエチレン・ビニルエステル共重合体(ただし、エチレン単位とビニルエステル単位との合計を100モル%とする。)、および、エチレン単位を90モル%以上95モル%以下、不飽和カルボン酸エステル単位を5モル%以上10モル%以下含み下記一般式(1)を満たすエチレン・不飽和カルボン酸エステル共重合体(ただし、エチレン単位と不飽和カルボン酸エステル単位との合計を100モル%とする。)、から選ばれる少なくとも一種の樹脂(A)を50~99質量部、
-3.0X+107>T ・・・(1)
(式(1)中、Xは不飽和カルボン酸エステル含有量(モル%)、TはJIS K7121-1987に準拠して測定した融点(℃)を表す)
エチレン・α-オレフィン共重合体およびA-B-A型ブロック共重合体(Aはポリスチレンブロックを表し、Bはアルキレン共重合体ブロックを表す。)から選ばれる少なくとも一種の樹脂(B)を1~50質量部、
粘着性付与樹脂(C)を0~10質量部含む(ただし、(A),(B),(C)の合計量は100質量部である。)、
シーラント用樹脂組成物。
(発明2)
樹脂(A)を60~95質量部、樹脂(B)を5~40質量部、樹脂(C)を0~10質量部含む(ただし、(A),(B),(C)の合計量は100質量部である。)、発明1のシーラント用樹脂組成物。
(発明3)
さらに、下記一般式(2)を満たすエチレン・不飽和カルボン酸エステル共重合体樹脂(D)を、樹脂(A)、樹脂(B)、樹脂(C)の合計100質量部に対して60質量部以下含む、発明1または2のシーラント用樹脂組成物。
T≧-3.0X+107 ・・・(2)
(式(2)中、Xは不飽和カルボン酸エステル含有量(モル%)、TはJIS K7121-1987に準拠して測定した融点(℃)を表す)
(発明4)
容器本体と蓋基材とのシーラントに用いられる、発明1~3のいずれかのシーラント用樹脂組成物。
(発明5)
蓋基材に接する少なくとも一部が耐衝撃性ポリスチレンからなる容器本体である、発明4のシーラント用樹脂組成物。
(発明6)
食品容器の蓋材用である、発明1~5のいずれかのシーラント用樹脂組成物。
(発明7)
発明1~6のいずれかのシーラント用樹脂組成物からなる層と基材層とを含む、蓋材。
(発明8)
発明7の蓋材を有する食品容器。
本発明のシーラント用樹脂組成物に含まれる樹脂(A)は、エチレン・ビニルエステル共重合体および下記一般式(1)を満たすエチレン・不飽和カルボン酸エステル共重合体から選ばれる少なくとも一種の樹脂である。
-3.0X+107>T ・・・(1)
(式(1)中、Xは不飽和カルボン酸エステル含有量(モル%)、TはJIS K7121-1987に準拠して測定した融点(℃)を表す)
上記Tの下限値は好ましくは-3.0X+87である。
-3.0X’+107>T’ ・・・(1’)
(式(1’)中、X’はビニルエステル含有量(モル%)、T’はJIS K7121-1987に準拠して測定した融点(℃)を表す)
上記T’ の下限値は好ましくは-3.0X+87である。
本発明のシーラント用樹脂組成物の樹脂(B)は、エチレンと炭素数3~18、好ましくは4~10のαーオレフィンとを共重合して得られる、エチレン・αーオレフィン共重合体、および、A-B-A型ブロック共重合体(Aはポリスチレンブロックを表し、Bはアルキレン共重合体ブロックを表す。)から選ばれる少なくとも一種の樹脂である。上記エチレン・αーオレフィン共重合体は、例えば、エチレンと、エチレン以外のα-オレフィン、例えばプロピレン、1-ブテン、1-ペンテン、1-ヘキセン、1-オクテン、1-デセン、1-ドデセン、4-メチル-1-ペンテンから選ばれる1種以上のαーオレフィンとの共重合体である。本発明の樹脂組成物の接着性を考慮すると、本発明で樹脂(B)として用いるエチレン・αーオレフィン共重合体としては、密度が好ましくは850kg/m3以上910kg/m3以下、さらに好ましくは870kg/m3以上900kg/m3以下のエチレン・αーオレフィン共重合体が用いられる。本発明で用いるエチレン・αーオレフィン共重合体のMFR(190℃、2160g荷重)は、一般には1g/10分以上100g/10分以下、好ましくは1g/10分以上60g/10分以下、さらに好ましくは1g/10分以上20g/10分以下である。上述のようなエチレン・αーオレフィン共重合体は、高活性チタン触媒成分と有機アルミニウム化合物からなる高活性チーグラーナッタ触媒、フィリップス触媒などの不均一系オレフィン重合触媒や、メタロセン触媒のような均一系オレフィン重合触媒等を利用して、気相法、溶液法、高圧法、スラリー法等のプロセスでエチレンと上記αーオレフィンとを共重合することにより製造される。
本発明のシーラント用樹脂組成物は、上記樹脂(A)、(B)、(C)を特定量比で配合したものである。すなわち、樹脂(A)を50~99質量部、樹脂(B)を1~50質量部、樹脂(C)を0~10質量部の割合で配合したものである。ただし(A)、(B)、(C)の合計量は100質量部である。本発明の樹脂組成物は、好ましくは、樹脂(A)を60~95質量部、樹脂(B)を5~40質量部、樹脂(C)を0~10質量部、より好ましくは樹脂(A)を70~95質量部、樹脂(B)を5~30質量部、樹脂(C)を0.5~8質量部、更に好ましくは樹脂(A)を70~95質量部、樹脂(B)を5~20質量部、樹脂(C)を1.0~5質量部の割合で配合したものである。
本発明のシーラント用樹脂組成物は、上記樹脂(A)、(B)、(C)の他に更に一般式(2)を満たすエチレン・不飽和カルボン酸エステル共重合体樹脂を含有することができる。本実施形態におけるエチレン・不飽和カルボン酸エステル共重合体(以下、樹脂(D)と呼ぶ。)は、エチレンと、不飽和カルボン酸アルキルエステルとの共重合体である。
アクリル酸またはメタクリル酸のアルキルエステルとしては、例えば、アクリル酸メチル、アクリル酸エチル、アクリル酸イソプロピル、アクリル酸nプロピル、アクリル酸イソプロピル、アクリル酸イソブチル、アクリル酸nブチル、アクリル酸2-エチルヘキシル、メタクリル酸エチル、メタクリル酸nプロピル、メタクリル酸イソプロピル、メタクリル酸イソブチル、メタクリル酸nブチル、マレイン酸ジメチル、マレイン酸ジエチル等が挙げられる。これらの中でも、入手のし易さ、性能および価格のバランスから炭素数2以上4以下のアルキルエステルを有する(メタ)アクリル酸アルキルエステルが好ましい。
T≧-3.0X+107 ・・・(2)
上記Tの上限値としては-3.0X+125が好ましい。
ただし、検量線は、核磁気共鳴スペクトル(NMR)によりEA濃度を求め、IRの860cm-1の吸光度との相関によって求める。式(1)中のX、式(1’)中のX’の算出方法も、上記Xの算出方法例に準じる。
本発明のシーラント用樹脂組成物は、該組成物の特性を損なわない限り、他の樹脂を含むことができる。また本発明のシーラント用樹脂組成物には、必要に応じて更に各種添加剤を配合することができる。このような添加剤として、例えば、酸化防止剤、紫外線吸収剤、光安定剤、熱安定剤、顔料、染料、帯電防止剤、滑剤や離ロール剤などの加工助剤である。
[実施例1~6、比較例1~7]
以下の樹脂を表1、表2に示す配合割合で仕込み量が10kgとなるように混合した。押出機(65mmφ、L/D=28、先端ダルメージフライトスクリュー)に投入し、加工温度180℃にて溶融混練することで樹脂組成物を作製し、本発明の樹脂組成物(実施例)と、比較用の樹脂組成物(比較例)を得た。
・EVA1:エチレン・酢酸ビニル共重合体
エチレン単位含有量92.9モル%、酢酸ビニル単位含有量7.1モル%、MFR(190℃,2160g荷重)15g/10分、融点84℃。オートクレーブ法による高圧ラジカル重合で製造された。
EVA2:エチレン・酢酸ビニル共重合体
エチレン単位含有量92.9モル%、酢酸ビニル単位含有量7.1モル%、MFR(190℃,2160g荷重)150g/10分、融点79℃。オートクレーブ法による高圧ラジカル重合で製造された。
・EVA3:エチレン・酢酸ビニル共重合体
エチレン単位含有量96.5モル%、酢酸ビニル単位含有量3.5モル%、MFR(190℃,2160g荷重)9g/10分、融点94℃。オートクレーブ法による高圧ラジカル重合で製造された。
EVA4:エチレン・酢酸ビニル共重合体
エチレン単位含有量88.8モル%、酢酸ビニル単位含有量11.2モル%、MFR(190℃,2160g荷重)15g/10分、融点71℃。オートクレーブ法による高圧ラジカル重合で製造された。
PO-1:三井化学社製エチレン・ブテンランダム共重合体エラストマー
MFR(190℃,2160g荷重)3.7g/10分 密度885kg/m3。
PO-2:三井化学社製エチレン・ヘキセンランダム共重合体
MFR(190℃,2160g荷重)3.7g/10分 密度905kg/m3。
SEBS:スチレン・エチレン・ブチレン・スチレンブロック共重合体
クレイトンジャパン社製「クレイトンG1657」。MFR(230℃,5000g荷重)22g/10分、密度900kg/m3。
粘着性付与樹脂:完全水素添加芳香族炭化水素樹脂
荒川化学社製商品。環球法軟化点115℃。
EMA:エチレン・メチルアクリレート共重合体
エチレン単位含有量92.5モル%、アクリル酸メチル単位含有量7.5モル%、MFR(190℃,2160g荷重)8g/10分、融点92℃。製造法: チューブラー法による高圧ラジカル重合で製造された。
EMAA:エチレン・メタクリル酸共重合体
エチレン単位含有量96.1モル%、メタクリル酸単位含有量3.9モル%、MFR(190℃,2160g荷重)8g/10分。
[対HIPS接着強度]
得られた樹脂組成物を、加工温度240℃、加工速度30m/分の押出ラミネート法により、ポリエチレンテレフタレート層(PET)、ポリエチレン層(PE)、メタクリル酸単位含有量3.9モル%のエチレン・メタクリル酸共重合体層(EMAA)と積層した。PET、PE、EMAA、樹脂組成物がこの順に積層された、PET(12μm)/PE(15μm)/EMAA(20μm)/樹脂組成物(10μm)の構成の積層体を得た。この積層体を、市販の厚さ0.4mmのHIPS シート上に、押圧力0.2MPa、加熱温度120℃、加熱時間1.0秒の条件でヒートシールし、室温で24時間放置した。その後、積層体から切り出した15mm幅の試験片の両面を反対方向に(180℃の剥離方向で)引張り、最大応力を求めた。この最大応力(N/15mm)を、ヒートシール温度120℃における樹脂組成物の対HIPS接着強度(N/15mm)とした。ヒートシール温度を変えた他は上記条件と同じように測定して、ヒートシール温度140℃及び160℃における樹脂組成物の対HIPS接着強度も求めた。測定結果を表1、表2に示す。
・A:特に良い。7N/15mm以上14N/15mm以下
・B:良い。5N/15mm以上7N/15mm未満、14N/15mm超15N/15mm以下
・C:やや悪い。3N/15mm以上5N/15mm未満、15N/15mm超20N/15mm以下
・D:不合格。3N/15mm未満あるいは20N/15mm超。
上記PET(12μm)/PE(15μm)/EMAA(20μm)/樹脂組成物(10μm)の構成の積層体から切り出した幅50mmのサンプル6枚を重ね、5kgf/cm2の荷重下40℃雰囲気で2日間エージングした。その後、6枚のサンプル相互の剥離強度をVangard社の測定機VG-35で測定した。得られた強度(g/50mm)を耐ブロッキング強度として表1、表2に示す。
・A:特に良い。10g/50mm未満。
・B:良い。10g/50mm以上、100g/50mm未満。
・C:悪い。100g/50mm以上。
厚生省告示第370号試験に用いられる片面抽出器を使用して試験した。この抽出容器で、上記PET(12μm)/PE(15μm)/EMAA(20μm)/樹脂組成物(10μm)の構成の積層体を樹脂組成物層を上にして置き、積層体の片面300cm2を溶媒であるn-ヘキサン600mlに接触した状態で室温にて2時間静置した。その後溶媒を蒸発させて残渣量(mg)を測定した。この残渣量を積層体からの溶媒抽出量(mg)とした。測定結果を表1、表2に示す。
・A:特に良い。20mg以下。
・B:良い。20mg超30mg以下。
・C:不合格。30mg超。
・-:測定しなかった。
このように、比較例のシーラント用樹脂組成物は接着性、溶媒抽出量、加工性のいずれかに問題があり、実用に適さない。
Claims (8)
- エチレン単位を90モル%以上95モル%以下、ビニルエステル単位を5モル%以上10モル%以下含むエチレン・ビニルエステル共重合体(ただし、エチレン単位とビニルエステル単位との合計を100モル%とする。)、および、エチレン単位を90モル%以上95モル%以下、不飽和カルボン酸エステル単位を5モル%以上10モル%以下含み下記一般式(1)を満たすエチレン・不飽和カルボン酸エステル共重合体(ただし、エチレン単位と不飽和カルボン酸エステル単位との合計を100モル%とする。)、から選ばれる少なくとも一種の樹脂(A)を50~99質量部、
-3.0X+107>T ・・・(1)
(式(1)中、Xは不飽和カルボン酸エステル含有量(モル%)、TはJIS K7121-1987に準拠して測定した融点(℃)を表す)
エチレン・α-オレフィン共重合体およびA-B-A型ブロック共重合体(Aはポリスチレンブロックを表し、Bはアルキレン共重合体ブロックを表す。)から選ばれる少なくとも一種の樹脂(B)を1~50質量部、
粘着性付与樹脂(C)を0~10質量部
含む(ただし、(A),(B),(C)の合計量は100質量部である。)、シーラント用樹脂組成物。 - 樹脂(A)を60~95質量部、樹脂(B)を5~40質量部、樹脂(C)を0~10質量部含む(ただし、(A),(B),(C)の合計量は100質量部である。)、請求項1記載のシーラント用樹脂組成物。
- さらに、下記一般式(2)を満たすエチレン・不飽和カルボン酸エステル共重合体樹脂(D)を、樹脂(A)、樹脂(B)、樹脂(C)の合計100質量部に対して60質量部以下含む、請求項1または2に記載のシーラント用樹脂組成物。
T≧-3.0X+107 ・・・(2)
(式(2)中、Xは不飽和カルボン酸エステル含有量(モル%)、TはJIS K7121-1987に準拠して測定した融点(℃)を表す) - 容器本体と蓋基材とのシーラントに用いられる、請求項1~3のいずれか一項に記載のシーラント用樹脂組成物。
- 蓋基材に接する少なくとも一部が耐衝撃性ポリスチレンからなる容器本体である、請求項4に記載のシーラント用樹脂組成物。
- 食品容器の蓋材用である、請求項1~5のいずれか一項に記載のシーラント用樹脂組成物。
- 請求項1~6のいずれか一項に記載のシーラント用樹脂組成物からなる層と基材層とを含む、蓋材。
- 請求項7に記載の蓋材を有する食品容器。
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