WO2020071513A1 - 多層構造体及びそれを用いた包装材 - Google Patents
多層構造体及びそれを用いた包装材Info
- Publication number
- WO2020071513A1 WO2020071513A1 PCT/JP2019/039214 JP2019039214W WO2020071513A1 WO 2020071513 A1 WO2020071513 A1 WO 2020071513A1 JP 2019039214 W JP2019039214 W JP 2019039214W WO 2020071513 A1 WO2020071513 A1 WO 2020071513A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- multilayer structure
- layer
- resin composition
- ethylene
- structure according
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B27/00—Layered products comprising a layer of synthetic resin
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- 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
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- B32B25/04—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B25/08—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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Definitions
- the present invention relates to a multilayer structure excellent in thermoformability and having little occurrence of bumps when collected and reused, and a packaging material using the same.
- a gas barrier resin film made of an ethylene-vinyl alcohol copolymer (hereinafter sometimes referred to as EVOH) or the like has been used as a transparent and highly oxygen-barrier packaging material.
- EVOH is also used for applications such as laminated packaging materials by taking advantage of thermoformability.
- a laminated packaging material for example, a laminated film in which a polyamide resin (nylon) is coextruded on both sides of EVOH for the purpose of improving the strength of the laminated film is known (Patent Document 1).
- Patent Literature 1 When the laminated film described in Patent Literature 1 is collected and reused, the polyamide resin and EVOH undergo a chemical reaction to be cross-linked to generate lumps, thereby causing a problem that the recyclability is reduced. .
- the present invention has been made in order to solve the above problems, a multilayer structure having excellent mechanical strength and thermoformability, and having little occurrence of bumps when collected and reused, and a multilayer structure It is intended to provide a packaging material used.
- a multilayer structure having a hard layer (A) and a resin composition layer (B1) or a resin composition layer (B2), wherein the piercing strength of the hard layer (A) is 40 N / mm or more and 150 N / mm or less, and the resin constituting the resin composition layer (B1) is an ethylene-vinyl alcohol copolymer (b1) having a melting point Tm1 of 170 ° C. or more (hereinafter sometimes referred to as EVOH (b1)).
- EVOH (b2) constituting the resin composition layer (B2) is represented by the following formula
- a multilayer structure comprising a modified EVOH containing a modified group having a primary hydroxyl group represented by I);
- X represents a hydrogen atom, a methyl group or a group represented by R 2 —OH.
- R 1 and R 2 each independently represent a single bond, an alkylene group having 1 to 9 carbon atoms or an alkyleneoxy group having 1 to 9 carbon atoms, wherein the alkylene group and the alkyleneoxy group are a hydroxyl group, an alkoxy group or It may contain a halogen atom.
- Multilayer structure [14] The multilayer structure of [13], having a layer configuration of an adhesive resin layer (C) / resin composition layer (B1) or a resin composition layer (B2) / adhesive resin layer (C); [15] A packaging material comprising the multilayer structure of any one of [1] to [14]; [16] A collection composition comprising a collection of the multilayer structure according to any one of [1] to [14]; [17] The problem is solved by providing a method for producing a recovered composition, which comprises melting and kneading a recovered material of the multilayer structure according to any one of [1] to [14].
- the multilayer structure of this invention and the packaging material using the same are excellent in mechanical strength and thermoformability, and when melt-molding the collection
- the multilayer structure of the present invention is a multilayer structure having a hard layer (A) and a resin composition layer (B1) or a resin composition layer (B2), and the piercing strength of the hard layer (A) is 40N. / Mm or more and 150 N / mm or less, and the resin constituting the resin composition layer (B1) comprises EVOH (b1) having a melting point Tm1 of 170 ° C. or more and EVOH (b2) having a melting point Tm2 of less than 170 ° C.
- the resin constituting the resin composition layer (B2) is a multilayer structure comprising a modified EVOH having a modifying group having a primary hydroxyl group represented by the following formula (I).
- X represents a hydrogen atom, a methyl group or a group represented by R 2 —OH.
- R 1 and R 2 each independently represent a single bond, an alkylene group having 1 to 9 carbon atoms or an alkyleneoxy group having 1 to 9 carbon atoms, wherein the alkylene group and the alkyleneoxy group are a hydroxyl group, an alkoxy group or It may contain a halogen atom.
- the piercing strength of the hard layer (A) is 40 N / mm or more and 150 N / mm or less. When the piercing strength is within the above range, it is possible to prevent the occurrence of pinholes in the packaging material when transporting food or the like packaged with the packaging material using the multilayer structure of the present invention.
- the piercing strength is preferably 45 N / mm or more, more preferably 50 N / mm or more, further preferably 55 N / mm or more, and particularly preferably 65 N / mm or more. Further, the piercing strength is preferably 120 N / mm or less, more preferably 100 N / mm or less, and further preferably 75 N / mm or less.
- the piercing strength of the hard layer (A) in this specification is obtained by conditioning a test piece made of a single-layer film having the same composition as that of the hard layer (A) at 23 ° C. and 50% RH for 24 hours. Below, a value calculated by measuring the load when a needle having a tip diameter of 1 mm penetrates the test piece at a speed of 50 mm / min and dividing the average value by the test piece thickness (mm) (N / mm).
- Examples of the resin used for the hard layer (A) include an olefin polymer, polyester, polystyrene, polyvinyl chloride, polyvinylidene chloride, acrylic resin, vinyl ester resin, polyester elastomer, polyurethane elastomer, chlorinated polyethylene, and chlorine.
- an olefin polymer polyester, polystyrene, polyvinyl chloride, polyvinylidene chloride, acrylic resin, vinyl ester resin, polyester elastomer, polyurethane elastomer, chlorinated polyethylene, and chlorine.
- Propylene, aromatic or aliphatic polyketone, aliphatic polyalcohol and the like, and an olefin polymer is preferably used.
- olefin polymer examples include linear low density polyethylene (LLDPE), low density polyethylene (LDPE), very low density polyethylene (VLDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), and ethylene-acetic acid.
- Vinyl copolymer (EVA) olefin-unsaturated carboxylic acid copolymer ionomer, ethylene-propylene copolymer, ethylene-acrylate copolymer, polypropylene, propylene- ⁇ -olefin ( ⁇ having 4 to 20 carbon atoms) -Olefin) Copolymers, homo- or copolymers of olefins such as polybutene and polypentene, graft-modified homo- or copolymers of these olefins with unsaturated carboxylic acids or esters thereof, and blends thereof.
- LLDPE linear low density polyethylene
- LDPE low density polyethylene
- VLDPE very low density polyethylene
- MDPE medium
- linear low-density polyethylene (LLDPE) and an ethylene-unsaturated carboxylic acid copolymer ionomer are preferable because the piercing strength of the hard layer (A) can be easily adjusted to the above range.
- the raw material of the polyethylene may be petroleum-derived or plant-derived, but from the viewpoint of reducing the environmental load during production, the olefin-based polymer is obtained using a plant-derived raw material. It is preferable to include plant-derived polyethylene.
- the linear low-density polyethylene is particularly preferably an ethylene polymer or a copolymer polymerized using a metallocene catalyst.
- An ethylene polymer or copolymer polymerized using a metallocene catalyst is a homopolymer of ethylene or a copolymer of ethylene and an ⁇ -olefin having 3 or more carbon atoms, and is a copolymer having a cyclopentadienyl skeleton.
- Polymerization of ethylene in the presence of a catalyst formed from a transition metal of Group 4 of the periodic table preferably a zirconium compound having at least one ligand, preferably a zirconium compound, an organoaluminum oxy compound and various components added as necessary. It is produced by copolymerizing ethylene and the ⁇ -olefin.
- Examples of the ⁇ -olefin having 3 or more carbon atoms in the ethylene copolymer include propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 1-dodecene, and 4-methyl-1-pentene. And the like.
- ethylene copolymer a copolymer of an ⁇ -olefin having 3 to 12 carbon atoms is particularly preferable.
- Ethylene polymers or copolymers polymerized using metallocene catalysts are commercially produced and commercially available, such as “Kernel” (manufactured by Nippon Polychem) and “Evolu” (manufactured by Prime Polymer). , “Exact” (manufactured by Exxon Chemical), “Affinity”, “Engage” (manufactured by Dow Chemical) and the like.
- the density of the olefin polymer is preferably 0.940 or less. When the density is within the above range, the obtained multilayer structure has sufficient stretchability and is excellent in piercing strength.
- the density is more preferably 0.930 or less, further preferably 0.920 or less, particularly preferably 0.915 or less, and most preferably 0.910 or less.
- the olefin polymer preferably has a melting point of 130 ° C or lower.
- the melting point is more preferably 120 ° C or lower, further preferably 110 ° C or lower, particularly preferably 100 ° C or lower.
- the melting point of the olefin polymer is measured by a method similar to that for EVOH described below.
- the MFR (190 ° C., 2160 g) of the olefin polymer is preferably less than 5.0 g / 10 minutes. When the MFR is in the above range, the obtained multilayer structure has sufficient stretchability, and the piercing strength is further improved.
- the MFR is more preferably less than 2.0 g / 10 minutes, and even more preferably less than 1.5 g / 10 minutes.
- the MFR of the olefin polymer is measured at 190 ° C. under a load of 2.16 kg in accordance with JIS K 7210.
- the olefin-unsaturated carboxylic acid copolymer ionomer is a polymer obtained by copolymerizing an unsaturated carboxylic acid and / or an unsaturated carboxylic acid ester with an olefin as a main component. ) It may be neutralized.
- the olefin constituting the copolymer include, for example, ethylene, propylene, butylene, and styrene. Of these, ethylene is preferably used.
- Examples of the unsaturated carboxylic acids constituting the olefin-unsaturated carboxylic acid copolymer ionomer include ethylenically unsaturated monocarboxylic acids such as acrylic acid, methacrylic acid, ethacrylic acid and crotonic acid, and fumaric acid, itaconic acid and maleic acid.
- Examples include ethylenically unsaturated dicarboxylic acids such as acid, monomethyl maleate, monoethyl maleate, and maleic anhydride, and anhydrides and half esters thereof. Of these, acrylic acid and methacrylic acid are most preferably used.
- the content of unsaturated carboxylic acid in the copolymer is preferably from 1 to 30% by mass, more preferably from 2 to 25% by mass, and still more preferably from 3 to 20% by mass. If the unsaturated carboxylic acid content is less than 1% by mass, the resulting multilayer structure may have insufficient thermoformability, and if it exceeds 30% by mass, the thermal stability of the hard layer (A) is reduced. There is a risk.
- Examples of metal ions that (partially) neutralize the carboxylic acid component of the olefin-unsaturated carboxylic acid copolymer include zinc, sodium, potassium, magnesium, calcium, barium, and lithium. It is preferably used.
- the degree of neutralization of the carboxylic acid component with metal ions is preferably 5 to 100%, more preferably 10 to 90%, and still more preferably 30 to 70%.
- the content of the resin in the hard layer (A) is preferably 50% by mass or more, more preferably 80% by mass or more, and even more preferably 90% by mass or more.
- the resin constituting the resin composition layer (B1) is composed of EVOH (b1) and EVOH (b2).
- the melting point Tm1 of EVOH (b1) is lower than 170 ° C., the piercing strength and gas barrier properties of the obtained multilayer structure are reduced.
- the melting point Tm2 of EVOH (b2) is 170 ° C. or higher, the thermoformability of the obtained multilayer structure is reduced.
- the resin constituting the resin composition layer (B1) is preferably composed of only EVOH (b1) and EVOH (b2).
- the difference (Tm1-Tm2) between the melting point Tm1 of EVOH (b1) and the melting point Tm2 of EVOH (b2) is preferably 5 or more, and more preferably 10 or more, from the viewpoint of improving the balance between the piercing strength, the gas barrier property, and the thermoformability. Is more preferable, 15 or more is more preferable, and 20 or more is particularly preferable.
- the melting point is about 50 ° C. lower than the glass transition point at a cooling rate of 30 ° C./min after the sample is once heated to 200 ° C. by a differential scanning calorimeter (DSC) according to the method described in JIS K7121. After cooling to a temperature, the temperature is increased again at a temperature increasing rate of 10 ° C./min, and measurement is performed (second run).
- DSC differential scanning calorimeter
- a method of adjusting the melting point Tm1 and the melting point Tm2 to the above ranges for example, a method of adjusting the ethylene content in EVOH can be mentioned. Also, the melting point of EVOH having the same ethylene content can be adjusted by adjusting the degree of saponification. The ethylene content and the degree of saponification of EVOH can be determined by a nuclear magnetic resonance (NMR) method.
- NMR nuclear magnetic resonance
- of the difference between the ethylene content (mol%) of EVOH (b2) and the ethylene content (mol%) of EVOH (b1), which constitutes the resin composition layer (B1), is 5 or more. Is preferred.
- is more preferably 7 or more, further preferably 9 or more, and particularly preferably 15 or more.
- is preferably 30 or less, more preferably 20 or less.
- the ethylene content of EVOH (b1) is preferably 15 to 38 mol%, more preferably 18 to 35 mol%.
- the ethylene content of the EVOH (b2) is preferably 35 to 55 mol%, more preferably 38 to 45 mol%.
- the degree of saponification of both EVOH (b1) and EVOH (b2) is preferably at least 90 mol%, more preferably at least 95 mol%, even more preferably at least 99 mol%. If the saponification degree is less than 90 mol%, the gas barrier properties and thermoformability may be reduced.
- EVOH (b1) and EVOH (b2) can be distinguished from single-composition (one type) EVOH in thermal analysis, particularly in DSC analysis.
- single-composition (one type) EVOH in thermal analysis, particularly in DSC analysis.
- the melting points of two types of EVOH to be mixed are significantly different, usually, two or more DSC peaks are observed.
- EVOHs having similar melting points are mixed, apparently a single peak is obtained, or when the melting points are separated from each other by a certain value or more, the shape of the peak becomes broad, depending on the mixing mass ratio and the like. .
- the presence of a peak at the shoulder of two peaks or the main peak should be observed by lowering the heating rate when measuring the melting point of EVOH by DSC.
- the resin composition layer (B1) used in the present invention can be specified from the characteristics of the peak of the DSC curve observed in the DSC analysis.
- the mass ratio (b2 / b1) of EVOH (b2) to EVOH (b1) in the resin composition layer (B1) is preferably from 1/99 to 50/50.
- the mass ratio (b2 / b1) is more preferably 5/95 or more.
- the mass ratio (b2 / b1) is more preferably 40/60 or less.
- the total content of EVOH (b1) and EVOH (b2) in the resin composition layer (B1) is preferably 50% by mass or more, more preferably 80% by mass or more, and even more preferably 90% by mass or more.
- EVOH (b1) and EVOH (b2) are each obtained by saponifying an ethylene-vinyl acetate copolymer.
- the ethylene-vinyl acetate copolymer is produced by a known polymerization method, for example, solution polymerization, suspension polymerization, emulsion polymerization and the like. Saponification of the ethylene-vinyl acetate copolymer can also be performed by a known method.
- copolymerizable ethylenically unsaturated monomers may be copolymerized as long as the effects of the present invention are not impaired.
- Examples of such monomers include olefins such as propylene, 1-butene and isobutene; Unsaturated acids such as acid, methacrylic acid, crotonic acid, (phthalic anhydride), (maleic anhydride), maleic acid (anhydrous) and itaconic acid or salts thereof, or mono- or dialkyl esters having 1 to 18 carbon atoms; acrylamide; Acrylamides such as 1 to 18 N-alkylacrylamide, N, N-dimethylacrylamide, 2-acrylamidopropanesulfonic acid or a salt thereof, acrylamidopropyldimethylamine or an acid salt thereof or a quaternary salt thereof, methacrylamide, and having 1 carbon atom; N-18 alkyl methacrylamide, N, N-dimethyl methacryl Methacrylamides such as amide, 2-methacrylamidopropanesulfonic acid or a salt thereof, methacrylamidopropyldimethylamine or an
- the method of mixing EVOH (b1) and EVOH (b2) is not particularly limited, and it is preferable to knead in a molten state from the viewpoint of uniformity of mixing.
- a known kneading device such as a kneader ruder, an extruder, a mixing roll, a Banbury mixer, a plast mill, and it is industrially preferable to use a single-screw or twin-screw extruder.
- (1) a method in which EVOH (b1) and EVOH (b2) are dry-blended and then supplied to the extruder collectively, and (2) one EVOH is supplied to the extruder and melted.
- EVOH (b1) and EVOH (b2) are dry-blended and then supplied to the extruder collectively, and (2) one EVOH is supplied to the extruder and melted.
- (3) a method of supplying the other EVOH in a molten state where one EVOH is supplied to an extruder and melted.
- the method (1) is practical in terms of simplicity and cost of the apparatus.
- the resin constituting the resin composition layer (B2) contains a modified EVOH containing a modifying group having a primary hydroxyl group represented by the following formula (I).
- this modified EVOH contains a modifying group having a primary hydroxyl group in addition to the ethylene unit and the vinyl alcohol unit, the thermoforming property of the obtained multilayer structure is improved, and the modified EVOH is described below as a resin composition layer (B2). Adhesion with the adhesive resin layer (C) is improved.
- X represents a hydrogen atom, a methyl group or a group represented by R 2 —OH.
- R 1 and R 2 each independently represent a single bond, an alkylene group having 1 to 9 carbon atoms or an alkyleneoxy group having 1 to 9 carbon atoms, wherein the alkylene and the alkyleneoxy group are a hydroxyl group, an alkoxy group or a halogen atom; It may contain atoms.
- the content of ethylene units with respect to all monomer units is preferably from 18 mol% to 55 mol%. If the ethylene unit content is less than 18 mol%, the melt moldability may deteriorate.
- the ethylene unit content is more preferably at least 25 mol%. On the other hand, if the ethylene unit content exceeds 55 mol%, gas barrier properties may be insufficient.
- the ethylene unit content is more preferably 50 mol% or less, and further preferably 45 mol% or less.
- the saponification degree of the vinyl ester component of the modified EVOH is preferably at least 90%, more preferably at least 95%, further preferably at least 98%, particularly preferably at least 99%.
- X is preferably a hydrogen atom or a group represented by R 2 —OH, and more preferably a group represented by R 2 —OH.
- the group represented by R 2 —OH is preferably a hydroxyalkyl group (R 2 is an alkylene group).
- the alkylene group and alkyleneoxy group used as R 1 and R 2 may include a hydroxyl group, an alkoxy group or a halogen atom.
- the alkylene group and the alkyleneoxy group may be linear or branched, or may form a ring.
- R 1 and R 2 are preferably an alkylene group or an alkyleneoxy group having 1 to 5 carbon atoms, and more preferably an alkylene group or an alkyleneoxy group having 1 to 3 carbon atoms.
- R 3 and R 4 each independently represent a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, and the alkyl group may include a hydroxyl group, an alkoxy group, or a halogen atom.
- R 5 has the same meaning as X in the formula (I).
- R 6 represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, and the alkyl group may include a hydroxyl group, an alkoxy group, or a halogen atom.
- R 7 and R 8 each independently represent a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, a cycloalkyl group having 3 to 8 carbon atoms, or a hydroxyl group. Further, some or all of the hydrogen atoms of the alkyl group and the cycloalkyl group may be substituted with a hydroxyl group, an alkoxy group, or a halogen atom.
- R 1 in the formula (I) is a single bond and X is a hydroxymethyl group (R 3 and R 4 in the formula (II) are hydrogen atoms).
- the modified EVOH having this modifying group for the resin composition layer (B2), the thermoformability and gas barrier properties of the obtained multilayer structure are improved.
- the content of the modified group having a primary hydroxyl group in the modified EVOH is preferably 0.05 mol% or more and 20 mol% or less. If the content of the modifying group is less than 0.05 mol%, the thermoformability may be reduced.
- the content of the modifying group is more preferably 0.1 mol% or more, further preferably 0.4 mol% or more, and most preferably 0.8 mol% or more.
- the barrier property may be reduced.
- the content of the modifying group is more preferably 10 mol% or less, further preferably 8 mol% or less, and most preferably 5 mol% or less.
- R 1 in the formula (I) is a hydroxymethylene group and X is a hydrogen atom (R 5 and R 6 in the formula (III) are hydrogen atoms).
- the thermoformability of the obtained multilayer structure is improved.
- the content of the modified group having a primary hydroxyl group in the modified EVOH is preferably 0.1 mol% or more and 20 mol% or less. If the content of the modifying group is less than 0.1 mol%, the thermoformability may be reduced.
- the content of the modifying group is more preferably 0.4 mol% or more, and still more preferably 1.0 mol% or more. When the content of the modifying group exceeds 20 mol%, the barrier properties may be reduced.
- the content of the modifying group is more preferably at most 10 mol%, further preferably at most 5 mol%.
- R 1 in the formula (I) is a methylmethyleneoxy group and X is a hydrogen atom.
- the methylmethyleneoxy group has an oxygen atom bonded to a carbon atom in the main chain. That is, in formula (IV), one of R 7 and R 8 is preferably a methyl group, and the other is preferably a hydrogen atom.
- the content of the modified group having a primary hydroxyl group in the modified EVOH is preferably 0.1 mol% or more and 20 mol% or less.
- the thermoformability may be reduced.
- the content of the modifying group is more preferably at least 1.0 mol%, further preferably at least 2.0 mol%.
- the barrier properties may be reduced.
- the content of the modifying group is more preferably at most 15 mol%, further preferably at most 10 mol%.
- the modified EVOH may be a mixture with unmodified EVOH.
- the mass ratio of the modified EVOH to the unmodified EVOH (modified EVOH / unmodified EVOH) in the mixture is preferably from 1/9 to 9/1.
- the mass ratio (modified EVOH / unmodified EVOH) is preferably 9/1 or more, and the resin composition layer (B2) substantially converts unmodified EVOH. More preferably, it is not contained.
- the content of the modified EVOH in the resin composition layer (B2) is preferably 50% by mass or more, more preferably 80% by mass or more, and even more preferably 90% by mass or more.
- a modified EVOH containing a modified group having a primary hydroxyl group represented by the above formula (I) can be produced by a method described in WO2018 / 52014 or the like.
- additives may be added to the resin composition layers (B1) and (B2) as long as the object of the present invention is not impaired.
- Other additives include, for example, saturated aliphatic amides (such as stearic acid amide), unsaturated fatty acid amides (such as oleic acid amide), bisfatty acid amides (such as ethylenebisstearic acid amide), and fatty acid metal salts (such as calcium stearate).
- Lubricants such as low molecular weight polyolefins (low molecular weight polyethylene having a molecular weight of about 500 to 10,000, low molecular weight polypropylene, etc.); inorganic fillers (hydrotalcite, etc.); plasticizers (aliphatic such as ethylene glycol, glycerin, hexanediol, etc.) Polyhydric alcohols); oxygen absorbers (inorganic oxygen absorbers, such as reduced iron powders, which are further added with a water-absorbing substance or electrolyte, aluminum powder, potassium sulfite, photocatalytic titanium oxide, etc .; Ascorbic acid and its fatty acids as organic compound oxygen absorbers Polyhydric phenols such as esters and metal salts, hydroquinone, gallic acid, hydroxyl-containing phenol aldehyde resins, bis-salicylaldehyde-imine cobalt, tetraethylene pentamine cobalt, cobalt-Schiff base complexes,
- Alkali metals such as sodium and potassium and / or alkaline earth metals such as calcium and magnesium may be contained as metal salts as other additives in the resin composition layer (B1) or (B2). Thereby, the crosslinking of the resin can be suppressed, and a multilayer structure excellent in recyclability can be obtained.
- the alkali metal salt include organic acids such as acetic acid, propionic acid, butyric acid, lauric acid, stearic acid, oleic acid, and behenic acid; and metal salts of inorganic acids such as sulfuric acid, sulfurous acid, carbonic acid, boric acid, and phosphoric acid. Is mentioned.
- the content of the alkali metal relative to the resin composition layer (B1) or (B2) is preferably 5 to 1000 ppm, more preferably 10 to 500 ppm, and still more preferably 20 to 300 ppm in terms of a metal element.
- the alkaline earth metal salt include an acetate, a borate, a phosphate, and a hydrogen phosphate.
- the content of the alkaline earth metal relative to the resin composition layer (B1) or (B2) is preferably 5 to 500 ppm, more preferably 10 to 300 ppm, even more preferably 20 to 250 ppm in terms of a metal element.
- the resin composition layer (B1) is previously contained in EVOH (b1) or EVOH (b2), or EVOH (b1) and EVOH (b2). At the same time, or in the resin composition layer (B1) after mixing EVOH (b1) and EVOH (b2), or a combination of these methods.
- the method of previously adding an alkali metal and / or an alkaline earth metal to EVOH includes (1) contacting a porous precipitate of EVOH having a water content of 20 to 80% by mass with an aqueous solution of an alkali (earth) metal compound. A method in which an alkali metal compound is contained in EVOH and then dried. (2) After an alkaline (earth) metal compound is contained in a homogeneous EVOH solution (water / alcohol solution or the like), the solution is added to a coagulating liquid. A method of extruding into a strand shape, cutting the obtained strand into pellets, and further performing a drying treatment.
- EVOH and an alkali (earth) metal compound are mixed at once and then melt-kneaded by an extruder or the like.
- the alkali (sodium hydroxide, potassium hydroxide, etc.) used in the saponification step is neutralized with acetic acid to produce by-products.
- a method for adjusting the sodium acetate, the amount of such potassium acetate by washing with water is preferable.
- the multilayer structure of the present invention preferably further has an adhesive resin layer (C) between the hard layer (A) and the resin composition layer (B1) or the resin composition layer (B2).
- the adhesive resin used in the adhesive resin layer (C) include a carboxyl group obtained by chemically bonding an unsaturated carboxylic acid or an anhydride thereof to an olefin polymer by an addition reaction, a graft reaction, or the like. Modified olefin polymer to be used.
- Examples of the unsaturated carboxylic acid or its anhydride include maleic acid, maleic anhydride, fumaric acid, acrylic acid, methacrylic acid, crotonic acid, itaconic acid, citraconic acid, hexahydrophthalic anhydride and the like. Is preferably used.
- maleic anhydride graft-modified polyethylene maleic anhydride graft-modified polypropylene, maleic anhydride graft-modified ethylene-propylene copolymer, maleic anhydride graft-modified ethylene-ethyl acrylate copolymer, maleic anhydride graft-modified ethylene
- One or a mixture of two or more selected from vinyl acetate copolymers and the like is mentioned as a preferable example.
- Adhesiveness may be improved by mixing a rubber / elastomer component such as polyisobutylene or ethylene-propylene rubber or a polyolefin resin different from the base polyolefin resin of the adhesive resin into the adhesive resin.
- a rubber / elastomer component such as polyisobutylene or ethylene-propylene rubber or a polyolefin resin different from the base polyolefin resin of the adhesive resin into the adhesive resin.
- the multilayer structure of the present invention is preferably such that the resin composition layer (B1) or the resin composition layer (B2) is disposed between two hard layers (A).
- any other layer may be provided between the hard layer (A) and the resin composition layer (B1) or (B2).
- an adhesive resin layer (C) is further provided between the hard layer (A) and the resin composition layer (B1) or the resin composition layer (B2).
- a multilayer structure having a layer configuration of (A) / (C) / (B1) or (B2) / (C) / (A) may be finally obtained.
- the lamination method include a method of co-extrusion of each resin, a method of bonding a single-layer film or the like previously used as the resin composition layer (B1) or (B2), and the resin composition layer (B1) or (B2).
- the molding temperature during melt molding is often selected from the range of 150 to 300 ° C.
- the resin composition layer (B1) or (B2) is used as an intermediate layer, and an adhesive resin layer (C) is provided so as to directly contact both sides of the intermediate layer, and the adhesive resin layer (C) / (B1) or It is also preferable to have a layer configuration of (B2) / (C). In this case, no other resin layer is included between the resin composition layer (B1) or (B2) and the adhesive resin layer (C).
- each layer of the multilayer structure having the layer configuration of (A) / (C) / (B1) or (B2) / (C) / (A) depends on the type, use, and packaging material of the thermoplastic resin of the surface layer.
- (A) / (C) / (B1) or (B2) / (C) / (A) is usually 5 to 200 ⁇ m / 1 to 50 ⁇ m / 1 to It is 50 ⁇ m / 1 to 50 ⁇ m / 5 to 200 ⁇ m, preferably 10 to 100 ⁇ m / 2 to 20 ⁇ m / 2 to 30 ⁇ m / 2 to 20 ⁇ m / 10 to 100 ⁇ m.
- the thickness of the hard layer (A) is less than 5 ⁇ m, the mechanical strength is insufficient and the film is easily broken. On the other hand, when the thickness exceeds 200 ⁇ m, the flexibility is lowered and the mass is increased more than necessary. If the thickness of the resin composition layer (B1) or (B2) is less than 1 ⁇ m, the gas barrier properties will be insufficient, and the thickness control will be unstable, and if it exceeds 50 ⁇ m, the flexibility will be poor and not economical, which is not preferable. When the thickness of the adhesive resin layer (C) is less than 1 ⁇ m, the interlayer adhesive strength is insufficient, and the thickness control becomes unstable. When the thickness exceeds 50 ⁇ m, the flexibility is lowered and it is not economical and is not preferable.
- the multilayer structure of the present invention is not limited to the above-mentioned (A) / (C) / (B1) or (B2) / (C) / (A) layer structure.
- the resins and compositions used for the layers having the same symbol in the layer constitution may be the same or different.
- different types of resins can be used.
- the piercing strength of the multilayer structure of the present invention is not particularly limited as long as it can be adjusted according to the application, but is preferably 4 to 20N.
- the multilayer structure having a piercing strength in the above range is suitably used as a packaging material or the like.
- the piercing strength is more preferably 5 N or more, still more preferably 6 N or more, and particularly preferably 7.5 N or more.
- the piercing strength of the multilayer structure in this specification is measured in accordance with JIS Z 1707, and specifically, the method described in Examples is adopted.
- the oxygen permeability (OTR) of the multilayer structure of the present invention is not particularly limited as long as it is adjusted according to the application, but is preferably 5 cc / m 2 .day.atm or less.
- the multilayer structure having the OTR in the above range is suitably used as a packaging material or the like.
- the OTR is more preferably 4 cc / m 2 .day.atm or less, the OTR is further preferably 3 cc / m 2 .day.atm or less, and the OTR is particularly preferably 2 cc / m 2 .day.atm or less. It is measured according to JIS K 7126-2 (isobaric method; 2006), and specifically, the method described in Examples is adopted.
- each layer of the multilayer structure of the present invention may have the above-mentioned various additives and modifiers, fillers, other resins, etc. in a range that does not impair the effects of the present invention in order to improve moldability and various physical properties. Can also be added.
- the collected material (scrap) obtained by collecting the end portions and defective products generated when the multilayer structure of the present invention is manufactured As described above, with regard to the recovery of the multilayer structure, an off-spec product generated at the time of manufacturing may be recovered, but it is a preferable embodiment to recover the multilayer structure that has been distributed on the market.
- the recovery composition containing the recovered material of the multilayer structure of the present invention is suitably used as a raw material of the multilayer structure.
- the multilayer structure of the present invention can be pulverized and formed again for the purpose of reuse. Further, the multilayer structure of the present invention is excellent in mechanical strength and thermoformability. On the other hand, since the multilayer structure does not contain a polyamide resin layer, when melt-molded, there is little occurrence of bumps, which are considered to be caused by the chemical reaction of the polyamide resin and EVOH to cause cross-linking. The recovered composition obtained by use has excellent appearance. From the viewpoint of further reducing the occurrence of such bumps, it is preferable that all the layers constituting the multilayer structure do not contain a polyamide resin.
- the recovery composition including the recovered material of the multilayer structure of the present invention is produced by melt-kneading the recovered material of the multilayer structure.
- the method of melt-forming the recovered material include extrusion molding, inflation extrusion, blow molding, melt spinning, and injection molding.
- the melting temperature varies depending on the melting point of the copolymer and the like, but is preferably about 150 to 270 ° C.
- the recovered composition may contain unused resin, but the content of the recovered material in the recovered composition is preferably 10% by mass or more.
- a packaging material comprising the multilayer structure of the present invention is a preferred embodiment of the present invention.
- the packaging material is processed into forms such as tubes and bags, and is useful as various packaging materials such as foods, beverages, pharmaceuticals, cosmetics, industrial chemicals, agricultural chemicals, detergents, etc. Is possible and is not limited to these applications.
- a preferred embodiment of the packaging material is a package formed by filling the content with the packaging material.
- INDUSTRIAL APPLICABILITY The package of the present invention is useful because it can prevent a decrease in flavor of contents caused by oxygen.
- Fillable contents include wine, fruit juice, etc. for beverages; fruits, nuts, vegetables, meat products, infant food, coffee, jam, mayonnaise, ketchup, edible oil, dressing, sauces, tsukudani, dairy products for foods And the like, but include, but are not limited to, pharmaceuticals, cosmetics, gasoline, and other contents that are likely to deteriorate in the presence of oxygen.
- the hard layer (A) is made of linear low-density polyethylene (mLLDPE-1; Prime Polymer's “Evolu SP0510”) polymerized using a metallocene catalyst, and has a resin composition of
- the material layer (B1) is 80 parts by mass of EVOH (ethylene content 27 mol%, saponification degree 99.9 mol%, melting point 190 ° C.) as EVOH (b1), and EVOH (ethylene content 44 as EVOH (b2)).
- Extrusion temperature of resin composition layer (B1): supply part / compression part / measurement part / die 170/220/220/220 ° C.
- Extrusion temperature of adhesive resin layer (C): supply part / compression part / measurement part / die 170/220/220/220 ° C.
- Extruder ⁇ Hard layer (A) 32 ⁇ extruder GT-32-A type (Plastic Engineering Laboratory Co., Ltd.) ⁇ Adhesive resin 25 ⁇ extruder P25-18-AC type (Osaka Seiki Co., Ltd.) ⁇ Resin composition 20 ⁇ extruder Laboratory machine ME type CO-EXT (manufactured by Toyo Seiki Co., Ltd.) T die: For 300mm width 3 types 5 layers (Plastic Engineering Laboratory Co., Ltd.) Cooling roll temperature: 60 ° C Pickup speed: 3m / min
- thermoformability The obtained multilayer structure is heated at a sheet temperature of 110 ° C. with a thermoforming machine (manufactured by Asano Seisakusho: vacuum pressure deep drawing machine “FX-0431-3 type”) and compressed air (atmospheric pressure 5 kgf / cm 2 ).
- a thermoforming machine manufactured by Asano Seisakusho: vacuum pressure deep drawing machine “FX-0431-3 type”
- compressed air atmospheric pressure 5 kgf / cm 2 .
- the obtained packaging material was visually observed to evaluate thermoformability.
- the molding conditions and evaluation criteria are shown below. Heater temperature: 600 ° C Plug: 45 ⁇ ⁇ 65mm Mold temperature: 40 ° C A: No abnormal appearance B: Some whitening failure C: Breakage
- the obtained multilayer structure was conditioned according to JIS Z 1707 under the conditions of 23 ° C. and 50% RH, and then cut into a circular shape having a diameter of 10 cm to obtain a test piece.
- the test piece was fixed using a jig, and a semi-circular needle with a diameter of 1.0 mm and a tip shape of 0.5 mm in radius was drawn by AUTOGRAPH (“AGS-H” manufactured by Shimadzu Corporation) at a speed of 50 mm / min. And the maximum stress (N) until the needle penetrated was measured to determine the piercing strength of the multilayer structure.
- OTR oxygen permeability
- the recovered material obtained by pulverizing the multilayer structure was formed into a film having a thickness of 20 ⁇ m using a 20 mm ⁇ extruder.
- the number of bumps per unit area of the obtained film (number / m 2 ) was measured. It was evaluated that the smaller the number of butters, the better the recyclability.
- Example 2 A multilayer structure and a packaging material were obtained in the same manner as in Example 1 except that the hard layer (A), the resin composition layer (B1), and the adhesive resin layer (C) were as shown in Table 1. Thereafter, various evaluations were performed. Table 1 shows the results.
- Example 2 “Himilan 1706” manufactured by DuPont-Mitsui Chemicals, an ethylene-methacrylic acid copolymer ionomer, was used as the hard layer (A).
- Example 3 "Evolue SP1510” manufactured by Prime Polymer Co., Ltd., which is a linear low-density polyethylene polymerized using a metallocene catalyst, was used.
- Example 6 "Evolue SP4510” manufactured by Prime Polymer Co., Ltd., which is a linear low-density polyethylene polymerized using a metallocene catalyst, was used.
- Example 7 “SLL318” manufactured by Braskem, which is a plant-derived polyethylene (linear low-density polyethylene polymerized using a metallocene catalyst) using plant-derived ethylene as a raw material, was used.
- Comparative Examples 2 and 5 a layer made of a polyamide resin was formed instead of the adhesive resin layer (C) using a polyamide resin ("Ultramid C40L” manufactured by BASF) instead of the maleic anhydride-modified polyethylene. .
- Example 8 the resin composition layer (B1) was formed using EVOH (ethylene content: 32 mol%, saponification degree: 99.9 mol%, melting point: 183 ° C.) as the EVOH (b1).
- EVOH ethylene content: 32 mol%, saponification degree: 99.9 mol%, melting point: 183 ° C.
- X is CH 2 OH
- R 1 is a modified EVOH containing a modifying group having a primary hydroxyl group represented by a single bond (ethylene content 27 mol%, saponification degree 99 (0.9 mol%, degree of modification: 1.0 mol%) to form a resin composition layer (B2) instead of the resin composition layer (B1).
- the multilayer structures of the examples are excellent in thermoformability and recyclability.
- the multilayer structure of Comparative Example 1 in which a layer composed of only EVOH having a melting point of 170 ° C. or more was formed instead of the resin composition layer (B1) was inferior in thermoformability and recyclability.
- the multilayer structure of Comparative Example 3 in which a layer made of only EVOH having a melting point of less than 170 ° C. was formed instead of the resin composition layer (B1) was inferior in gas barrier properties.
- the multilayer structure of Comparative Examples 2 and 5 in which a polyamide layer was formed instead of the adhesive resin layer (C) was obtained by melting and kneading a recovered product of the multilayer structure and reusing the polyamide layer. By cross-linking by reacting with EVOH, a number of spots were generated, and the recyclability was poor.
- the multilayer structure of Comparative Example 4 having a layer made of “Novatec LC600” manufactured by Nippon Polyethylene Co., Ltd., which is a low-density polyethylene, instead of the hard layer (A), has low piercing strength and insufficient hardness. Because of this, the thermoformability was poor.
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Abstract
Description
[1]硬質層(A)と、樹脂組成物層(B1)または樹脂組成物層(B2)とを有する多層構造体であって、硬質層(A)の突き刺し強度が40N/mm以上150N/mm以下であり、樹脂組成物層(B1)を構成する樹脂が、融点Tm1が170℃以上であるエチレン-ビニルアルコール共重合体(b1)(以下、EVOH(b1)と称することがある)と融点Tm2が170℃未満であるエチレン-ビニルアルコール共重合体(b2)(以下、EVOH(b2)と称することがある)からなり、樹脂組成物層(B2)を構成する樹脂が、下記式(I)で表される一級水酸基を持つ変性基を含有する変性EVOHからなる、多層構造体;
[2]EVOH(b1)に対するEVOH(b2)の質量比(b2/b1)が1/99~50/50である、[1]の多層構造体;
[3]EVOH(b2)のエチレン含有量(モル%)とEVOH(b1)のエチレン含有量(モル%)の差の絶対値|b2-b1|が5以上である、[1]又は[2]の多層構造体;
[4]硬質層(A)がオレフィン系重合体を含む、[1]~[3]のいずれかの多層構造体;
[5]前記オレフィン系重合体が直鎖状低密度ポリエチレンである、[4]の多層構造体;
[6]直鎖状低密度ポリエチレンが、メタロセン触媒を用いて重合されたエチレン重合体又は共重合体である、[5]の多層構造体;
[7]前記オレフィン系重合体が植物由来ポリエチレンを含む、[4]~[6]のいずれかの多層構造体;
[8]前記オレフィン系重合体がエチレン-不飽和カルボン酸共重合体アイオノマーである、[4]の多層構造体;
[9]前記オレフィン系重合体の密度が0.940以下である、[4]~[7]のいずれかの多層構造体;
[10]前記オレフィン系重合体の融点が130℃以下である、[4]~[9]のいずれかの多層構造体;
[11]前記オレフィン系重合体のメルトフローレート(190℃、2160g)(以下、メルトフローレートをMFRと称することがある)が5.0g/10分未満である、[4]~[10]のいずれかの多層構造体;
[12]樹脂組成物層(B1)または樹脂組成物層(B2)が2つの硬質層(A)の間に配置されてなる、[1]~[11]のいずれかの多層構造体;
[13]硬質層(A)と、樹脂組成物層(B1)または樹脂組成物層(B2)との間に、さらに接着性樹脂層(C)を有する、[1]~[12]のいずれかの多層構造体;
[14]接着性樹脂層(C)/樹脂組成物層(B1)または樹脂組成物層(B2)/接着性樹脂層(C)の層構成を有する、[13]の多層構造体;
[15][1]~[14]のいずれかの多層構造体からなる包装材;
[16][1]~[14]のいずれかの多層構造体の回収物を含む、回収組成物;
[17][1]~[14]のいずれかの多層構造体の回収物を溶融混錬する、回収組成物の製造方法を提供することにより解決される。
硬質層(A)の突き刺し強度は40N/mm以上150N/mm以下である。突き刺し強度が上記範囲であることで、本発明の多層構造体を用いた包装材で包装された食品等を運搬する際に、該包装材におけるピンホールの発生を防ぐことができる。突き刺し強度は45N/mm以上が好ましく、50N/mm以上がより好ましく、55N/mm以上がさらに好ましく、65N/mm以上が特に好ましい。また、突き刺し強度は120N/mm以下が好ましく、100N/mm以下がより好ましく、75N/mm以下がさらに好ましい。本明細書における硬質層(A)の突き刺し強度は、硬質層(A)と同じ組成の単層フィルムからなる試験片を、23℃、50%RH条件下で24時間調湿した後、同条件下で、先端直径1mmの針が、50mm/minの速度で試験片を突き抜けた時の荷重を測定し、その平均値を試験片厚み(mm)で除することにより算出される値(N/mm)である。
樹脂組成物層(B1)を構成する樹脂は、EVOH(b1)とEVOH(b2)からなる。EVOH(b1)の融点Tm1が170℃よりも小さい場合には、得られる多層構造体の突き刺し強度とガスバリア性が低下する。また、EVOH(b2)の融点Tm2が170℃以上の場合には、得られる多層構造体の熱成形性が低下する。樹脂組成物層(B1)を構成する樹脂は、EVOH(b1)とEVOH(b2)のみからなることが好ましい。
樹脂組成物層(B2)を構成する樹脂は、下記式(I)で表される一級水酸基を持つ変性基を含有する変性EVOHを含む。この変性EVOHがエチレン単位及びビニルアルコール単位に加えて、一級水酸基を持つ変性基を含有することによって、得られる多層構造体の熱成形性が向上するとともに、樹脂組成物層(B2)と後述する接着性樹脂層(C)との接着性が向上する。
本発明の多層構造体は、硬質層(A)と樹脂組成物層(B1)又は樹脂組成物層(B2)との間に、さらに接着性樹脂層(C)を有することが好ましい。接着性樹脂層(C)に用いられる接着性樹脂としては、例えば不飽和カルボン酸又はその無水物をオレフィン系重合体に付加反応やグラフト反応等により化学的に結合させて得られるカルボキシル基を含有する変性オレフィン系重合体を挙げることができる。不飽和カルボン酸又はその無水物としては、マレイン酸、無水マレイン酸、フマル酸、アクリル酸、メタクリル酸、クロトン酸、イタコン酸、シトラコン酸、ヘキサヒドロ無水フタル酸等が挙げられ、中でも、無水マレイン酸が好適に用いられる。具体的には、無水マレイン酸グラフト変性ポリエチレン、無水マレイン酸グラフト変性ポリプロピレン、無水マレイン酸グラフト変性エチレン-プロピレン共重合体、無水マレイン酸グラフト変性エチレン-エチルアクリレート共重合体、無水マレイン酸グラフト変性エチレン-酢酸ビニル共重合体等から選ばれた1種又は2種以上の混合物が好適なものとして挙げられる。
本発明の多層構造体は、樹脂組成物層(B1)又は樹脂組成物層(B2)が2つの硬質層(A)の間に配置されてなることが好ましい。この場合、硬質層(A)と、樹脂組成物層(B1)又は(B2)の間に任意の他の層を設けても良い。
共押出多層キャスト製膜装置を用いて、硬質層(A)がメタロセン触媒を用いて重合された直鎖状低密度ポリエチレン(mLLDPE-1;プライムポリマー社製「エボリューSP0510」)からなり、樹脂組成物層(B1)がEVOH(b1)としてEVOH(エチレン含有量27モル%、ケン化度99.9モル%、融点190℃)を80質量部、及びEVOH(b2)としてEVOH(エチレン含有量44モル%、ケン化度99.9モル%、融点165℃)を20質量部配合した樹脂組成物からなり、接着性樹脂層(C)が無水マレイン酸変性ポリエチレン(三井化学社製「AdmerNF518」)からなる多層構造体((A)/(C)/(B1)/(C)/(A)=41μm/6μm/6μm/6μm/41μmの層厚みと層構成を有する5層共押出多層キャストフィルム)を得た。このときの製膜条件は以下に示す。
共押出条件
硬質層(A)の押出温度:供給部/圧縮部/計量部/ダイ=170/220/220/220℃
樹脂組成物層(B1)の押出温度:供給部/圧縮部/計量部/ダイ=170/220/220/220℃
接着樹脂層(C)の押出温度:供給部/圧縮部/計量部/ダイ=170/220/220/220℃
押出機:
・硬質層(A) 32φ押出機 GT-32-A型(株式会社プラスチック工学研究所製)
・接着性樹脂 25φ押出機 P25-18-AC型(大阪精機工作株式会社製)
・樹脂組成物 20φ押出機 ラボ機ME型CO-EXT(株式会社東洋精機製)
Tダイ:300mm幅3種5層用(株式会社プラスチック工学研究所製)
冷却ロールの温度:60℃
引取速度:3m/分
20mmφ単軸押出機(押出温度200℃)を用いて、硬質層(A)に使用される樹脂からなる厚み100μmの単層フィルムを製膜し、当該単層フィルムを試験片として用いた。当該試験片を23℃、50%RH条件下で24時間調湿した後、同条件下で、先端直径1mmの針が、50mm/minの速度で試験片を突き抜けた時の荷重を測定し、その平均値を試験片厚み(mm)で除することにより突き刺し強度(N/mm)を算出した。
得られた多層構造体を熱成形機(浅野製作所製:真空圧空深絞り成形機「FX-0431-3型」)にて、シート温度を110℃にして、圧縮空気(気圧5kgf/cm2)により丸カップ形状の包装材(金型形状:上部75mmφ、下部60mmφ、深さ37mm、絞り比S=0.5)に熱成形した。得られた包装材を目視で観察し、熱成形性を評価した。成形条件及び評価の基準を以下に示す。
ヒーター温度:600℃
プラグ:45φ×65mm
金型温度:40℃
A:外観異常なし
B:一部白化不良あり
C:破断箇所あり
得られた多層構造体をJIS Z 1707に準拠し、23℃、50%RHの条件下で調湿した後、直径10cmの円形にカットして試験片を得た。治具を用いて試験片を固定し、AUTOGRAPH(島津製作所製「AGS-H」)で直径1.0mm、先端形状が半径0.5mmの半円形である針を50mm/分の速度で試験片に突き刺すことで、針が貫通するまでの最大応力(N)を測定して、多層構造体の突き刺し強度とした。
酸素透過量測定装置(MOCON社製「MOCON OX-TRAN2/20型」)を用い、20℃、65%RH条件下でJIS K 7126-2(等圧法;2006年)に準じて、得られた多層構造体の酸素透過度(OTR)を測定し、その平均値を求めた。
多層構造体を粉砕して得られた回収物を20mmφ押出機を用いて、厚み20μmのフィルムに製膜した。得られたフィルムの単位面積当たりに見られるブツの個数(個数/m2)を計測した。ブツの個数が少ないほど、リサイクル性に優れると評価した。
A:500個/m2未満
B:500個/m2以上、750個/m2未満
C:750個/m2以上、1000個/m2未満
D:1000個/m2以上
硬質層(A)、樹脂組成物層(B1)、及び接着性樹脂層(C)を表1に示す通りとしたこと以外は実施例1と同様にして、多層構造体及び包装材を得た後、各種評価を行った。結果を表1に示す。なお、硬質層(A)として、実施例2ではエチレン-メタクリル酸共重合体アイオノマーである三井デュポンケミカル社製「ハイミラン1706」を用いた。実施例3ではメタロセン触媒を用いて重合された直鎖状低密度ポリエチレンであるプライムポリマー社製「エボリューSP1510」を用いた。実施例6ではメタロセン触媒を用いて重合された直鎖状低密度ポリエチレンであるプライムポリマー社製「エボリューSP4510」を用いた。実施例7では植物由来のエチレンを原料とする植物由来ポリエチレン(メタロセン触媒を用いて重合された直鎖状低密度ポリエチレン)であるブラスケム社製「SLL318」を用いた。比較例2及び比較例5では、無水マレイン酸変性ポリエチレンの代わりにポリアミド樹脂(BASF社製「Ultramid C40L」)を用いて、接着性樹脂層(C)の代わりにポリアミド樹脂からなる層を形成した。EVOH(b1)として、実施例8ではEVOH(エチレン含有量32モル%、ケン化度99.9モル%、融点183℃)を用いて樹脂組成物層(B1)を形成した。実施例9では表2に記載の式(I)においてXがCH2OH、R1が単結合で表される一級水酸基を持つ変性基を含有する変性EVOH(エチレン含有量27モル%、ケン化度99.9モル%、変性度1.0モル%)を用いて樹脂組成物層(B1)の代わりに樹脂組成物層(B2)を形成した。
Claims (17)
- 硬質層(A)と、樹脂組成物層(B1)または樹脂組成物層(B2)とを有する多層構造体であって、
硬質層(A)の突き刺し強度が40N/mm以上150N/mm以下であり、
樹脂組成物層(B1)を構成する樹脂が、融点Tm1が170℃以上であるエチレン-ビニルアルコール共重合体(b1)と融点Tm2が170℃未満であるエチレン-ビニルアルコール共重合体(b2)からなり、
樹脂組成物層(B2)を構成する樹脂が、下記式(I)で表される一級水酸基を持つ変性基を含有する変性エチレン-ビニルアルコール共重合体からなる、多層構造体。
- エチレン-ビニルアルコール共重合体(b1)に対するエチレン-ビニルアルコール共重合体(b2)の質量比(b2/b1)が1/99~50/50である、請求項1に記載の多層構造体。
- エチレン-ビニルアルコール共重合体(b2)のエチレン含有量(モル%)とエチレン-ビニルアルコール共重合体(b1)のエチレン含有量(モル%)の差の絶対値|b2-b1|が5以上である、請求項1又は2に記載の多層構造体。
- 硬質層(A)がオレフィン系重合体を含む、請求項1~3のいずれかに記載の多層構造体。
- 前記オレフィン系重合体が直鎖状低密度ポリエチレンである、請求項4に記載の多層構造体。
- 前記直鎖状低密度ポリエチレンが、メタロセン触媒を用いて重合されたエチレン重合体又は共重合体である、請求項5に記載の多層構造体。
- 前記オレフィン系重合体が植物由来ポリエチレンを含む、請求項4~6のいずれかに記載の多層構造体。
- 前記オレフィン系重合体がエチレン-不飽和カルボン酸共重合体アイオノマーである、請求項4に記載の多層構造体。
- 前記オレフィン系重合体の密度が0.940以下である、請求項4~7のいずれかに記載の多層構造体。
- 前記オレフィン系重合体の融点が130℃以下である、請求項4~9のいずれかに記載の多層構造体。
- 前記オレフィン系重合体のメルトフローレート(190℃、2160g)が5.0g/10分未満である、請求項4~10のいずれかに記載の多層構造体。
- 樹脂組成物層(B1)または樹脂組成物層(B2)が2つの硬質層(A)の間に配置されてなる、請求項1~11のいずれかに記載の多層構造体。
- 硬質層(A)と、樹脂組成物層(B1)または樹脂組成物層(B2)との間に、さらに接着性樹脂層(C)を有する、請求項1~12のいずれかに記載の多層構造体。
- 接着性樹脂層(C)/樹脂組成物層(B1)または樹脂組成物層(B2)/接着性樹脂層(C)の層構成を有する、請求項13に記載の多層構造体。
- 請求項1~14のいずれかに記載の多層構造体からなる、包装材。
- 請求項1~14のいずれかに記載の多層構造体の回収物を含む、回収組成物。
- 請求項1~14のいずれかに記載の多層構造体の回収物を溶融混錬する、回収組成物の製造方法。
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JPWO2020071513A1 (ja) | 2021-09-02 |
US20210269209A1 (en) | 2021-09-02 |
CN112752649A (zh) | 2021-05-04 |
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