# US 11,898,065 B2 · Resin composition for sealant, laminate, packaging material, and package

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- Number: US 11,898,065 B2
- Document ID: US11898065B2
- Status: Granted
- Kind: B2
- Application number: 17/293,504
- Filed: 2019-11-19
- Published: 2021-12-30
- Granted: 2024-02-13
- Earliest claimed: 2018-11-30
- Assignees: Dow-Mitsui Polychemicals Co., Ltd.
- Applicants: Dow-Mitsui Polychemicals Co., Ltd.
- Inventors: Koichi Nishijima; Hiroaki Machiya; Hisao Gonohe; Yoshitaka Hironaka
- Web page: https://patentgrep.com/patent/US11898065B2

## CPC

- C09J 123/0869: {Acids or derivatives thereof}
- B32B 1/00: Layered products having a non-planar shape
- B32B 15/043: {of metal (B32B15/01 takes precedence)}
- B32B 15/082: comprising vinyl resins; comprising acrylic resins
- B32B 15/085: comprising polyolefins
- B32B 15/088: comprising polyamides
- B32B 15/09: comprising polyesters
- B32B 15/098: comprising condensation resins of aldehydes, e.g. with phenols, ureas or melamines
- B32B 15/12: of paper or cardboard
- B32B 15/20: comprising aluminium or copper {(B32B15/016 and B32B15/017 take precedence)}
- B32B 27/08: of synthetic resin
- B32B 27/10: of paper or cardboard
- B32B 27/20: using fillers, pigments, thixotroping agents
- B32B 27/30: comprising vinyl {(co)polymers; comprising acrylic (co)polymers}
- B32B 27/302: {comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers}
- B32B 27/306: {comprising vinyl acetate or vinyl alcohol (co)polymers}
- B32B 27/308: {comprising acrylic (co)polymers}
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B32B 27/34: comprising polyamides
- B32B 27/36: comprising polyesters
- B32B 27/42: comprising condensation resins of aldehydes, e.g. with phenols, ureas or melamines
- B32B 29/005: {next to another layer of paper or cardboard layer}
- B65D 65/40: Applications of laminates for particular packaging purposes {(B65D1/0215, B65D1/28, B65D3/22, B65D5/0281, B65D5/563, B65D9/30, B65D29/02, B65D31/02, B65D75/26, B65D77/2024, B65D81/1275, B65D81/3811, B65D81/3823, B65D81/3834, B65D81/3846, B65D81/3858, B65D81/3874, B65D81/3886, B65D81/3897 take precedence; laminates per se or laminated packages characterised by the composition or)}
- C08L 23/0869: with unsaturated acids, e.g. [meth]acrylic acid; with unsaturated esters, e.g. [meth]acrylic acid esters
- C09J 7/30: characterised by the adhesive composition
- B32B 2250/03: 3 layers
- B32B 2250/246: All polymers belonging to those covered by groups B32B27/32 and B32B27/30
- B32B 2255/20: Inorganic coating
- B32B 2255/205: Metallic coating
- B32B 2255/26: Polymeric coating
- B32B 2270/00: Resin or rubber layer containing a blend of at least two different polymers
- B32B 2307/31: Heat sealable
- B32B 2307/7244: Oxygen barrier
- B32B 2307/732: Dimensional properties
- B32B 2439/40: Closed containers
- B32B 2439/70: Food packaging
- B32B 2439/80: Medical packaging
- B32B 2553/00: Packaging equipment or accessories not otherwise provided for
- C08L 53/025: {modified}
- C08L 2203/162: sealable films
- C08L 2205/03: containing three or more polymers in a blend
- C08L 2205/035: containing four or more polymers in a blend
- C08L 2310/00: Masterbatches
- C09J 2423/04: Presence of homo or copolymers of ethene
- C09J 2423/046: in the substrate
- C09J 2433/00: Presence of (meth)acrylic polymer
- C09J 2433/006: in the substrate
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- 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
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

A resin composition for a sealant has excellent heat-sealing strength with respect to a substrate, and a reduced elution amount thereof into normal heptane. A resin composition for a sealant includes: a resin (A) which is an ethylene-(meth)acrylic acid ester copolymer in which a content of a (meth)acrylic acid ester unit is from 10% by mass to 25% by mass; and a tackifying resin (B), in which a content of the resin (A) is more than 45% by mass with respect to a total amount of resin components in the resin composition for a sealant, and a content of the tackifying resin (B) is from 0.1% by mass to 10% by mass with respect to the total amount of the resin components in the resin composition for a sealant.

## Claims

### Claim 1

A resin composition for a sealant, comprising:
a resin (A) that is an ethylene-(meth)acrylic acid ester copolymer in which a content of a (meth)acrylic acid ester unit is from 10% by mass to 25% by mass;
a tackifying resin (B) having a ring and ball method softening point of from 100° C. to 130° C.;
a resin (C) that is an ethylene-vinyl ester copolymer in which a content of a vinyl ester unit with respect to a total amount of the ethylene-vinyl ester copolymer is from 7% by mass to 13% by mass;
a resin (D) that is at least one selected from the group consisting of an ethylene-α-olefin copolymer elastomer and a styrene-based elastomer; and
an erucic acid amide,
wherein a density of the ethylene-α-olefin copolymer elastomer is from 850 kg/m3 to less than 900 kg/m3,
a content of the resin (A) is more than 45% by mass with respect to a total amount of resin components in the resin composition for a sealant,
a content of the tackifying resin (B) is from 0.1% by mass to 3% by mass with respect to a total amount of resin components in the resin composition for a sealant,
a content of the erucic acid amide is from 0.01% by mass to 0.096% by mass with respect to a total amount of resin components in the resin composition for a sealant,
a total content of resin components is 80% by mass or more with respect to a total amount of the resin composition for a sealant, and
an elution amount of the resin composition for a sealant into normal heptane is 30 μg/mL or less.

### Claim 2 (depends on 1)

The resin composition for a sealant according to claim 1, wherein a content of the resin (D) is from 5% by mass to 40% by mass with respect to a total amount of resin components in the resin composition.

### Claim 3 (depends on 1)

The resin composition for a sealant according to claim 1, used as a sealant for a packaging material.

### Claim 4 (depends on 3)

The resin composition for a sealant according to claim 3, wherein the packaging material is for skin pack packaging.

### Claim 5 (depends on 1)

A laminate, comprising:
a substrate layer; and
a sealant layer containing the resin composition for a sealant according to claim 1.

### Claim 6 (depends on 5)

The laminate according to claim 5, wherein the substrate layer contains at least one selected from the group consisting of an ionomer of an ethylene-unsaturated carboxylic acid copolymer and an ethylene-unsaturated ester copolymer.

### Claim 7 (depends on 5)

The laminate according to claim 5, wherein a thickness of the laminate is from 40 μm to 300 μm.

### Claim 8 (depends on 5)

A packaging material, comprising the laminate according to claim 5.

### Claim 9 (depends on 8)

The packaging material according to claim 8, further comprising a substrate.

### Claim 10 (depends on 9)

The packaging material according to claim 9, wherein the substrate comprises polypropylene.

### Claim 11 (depends on 5)

A package, comprising:
a substrate;
the laminate according to claim 5; and
a packaged object packaged by the substrate and the laminate.