# US 10,501,617 B2 · Block copolymer composition, molded material, resin composition, and molded product

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- Number: US 10,501,617 B2
- Document ID: US10501617B2
- Status: Granted
- Kind: B2
- Application number: 15/548,895
- Filed: 2016-02-05
- Published: 2018-01-25
- Granted: 2019-12-10
- Earliest claimed: 2015-02-09
- Assignees: Asahi Kasei Kabushiki Kaisha
- Applicants: Asahi Kasei Kabushiki Kaisha
- Inventors: Yukari Hori; Satoshi Takahashi; Naohiko Sato; Osamu Ishihara; Susumu Hoshi; Kei Shimazu
- Web page: https://patentgrep.com/patent/US10501617B2

## CPC

- C08L 53/02: of vinyl-aromatic monomers and conjugated dienes
- C08F 297/044: {using a coupling agent}
- C08L 9/06: Copolymers with styrene
- C08L 25/06: Polystyrene
- C08L 25/08: Copolymers of styrene (C08L29/08, C08L35/06, C08L55/02 take precedence)
- C08L 25/10: with conjugated dienes
- C08L 51/04: grafted on to rubbers
- C08L 55/02: ABS [Acrylonitrile-Butadiene-Styrene] polymers
- C08L 2201/10: Transparent films; Clear coatings; Transparent materials
- C08L 2205/02: containing two or more polymers of the same C08L -group
- C08L 2205/03: containing three or more polymers in a blend
- C08L 2205/035: containing four or more polymers in a blend
- Y02P 20/582: Recycling of unreacted starting or intermediate materials
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A block copolymer composition comprising: a polymer (a) comprising more than 95% by mass and 100% by mass or less of a vinyl aromatic monomer unit and 0% by mass or more and less than 5% by mass of a conjugated diene monomer unit; and a block copolymer (b) comprising 15% by mass or more and 50% by mass or less of a vinyl aromatic monomer unit and 50% by mass or more and 85% by mass or less of a conjugated diene monomer unit, wherein a mass ratio of the polymer (a) to the block copolymer (b) satisfies: (a)/(b)=70/30 to 30/70.

## Claims

### Claim 1

A block copolymer composition comprising:
a polymer (a) comprising more than 95% by mass and less than 100% by mass of a vinyl aromatic monomer unit and more than 0% by mass and less than 5% by mass of a conjugated diene monomer unit; and
a block copolymer (b) comprising 15% by mass and 50% by mass or less of a vinyl aromatic monomer unit and 50% by mass or more and 85% by mass or less of a conjugated diene monomer unit, wherein the conjugated diene monomer unit excludes isoprene,
wherein a mass ratio of the polymer (a) to the block copolymer (b) satisfies:
(a)/(b)=70/30 to 30/70.

### Claim 2 (depends on 1)

The block copolymer composition according to claim 1, wherein a total content of a dimer and trimer each comprising a vinyl aromatic monomer is less than 1000 ppm.

### Claim 3 (depends on 1)

The block copolymer composition according to claim 1, wherein a haze value for 2 mm thickness defined in ISO 14782 is 65% or more and 100% or less.

### Claim 4 (depends on 1)

The block copolymer composition according to claim 1, wherein the block copolymer composition has at least one peak molecular weight in a range of 30000 or more and 180000 or less in a molecular weight distribution curve obtained through a GPC method.

### Claim 5 (depends on 1)

The block copolymer composition according to claim 1, wherein the block copolymer composition has at least one tan δ peak of dynamic viscoelasticity at a temperature in a range of −70° C. to −40° C.

### Claim 6 (depends on 1)

A molded material comprising the block copolymer composition according to claim 1.

### Claim 7 (depends on 1)

A resin composition comprising:
80% by mass or more and 99% by mass or less of a rubber-modified vinyl aromatic polymer (c); and
1% by mass or more and 20% by mass or less of the block copolymer composition of claim 1.

### Claim 8 (depends on 1)

A resin composition comprising:
more than 0% by mass and 80% by mass or less of a vinyl aromatic-based polymer (d);
10% by mass or more and 45% by mass or less of a rubber-modified vinyl aromatic polymer (c); and
10% by mass or more and 55% by mass or less of the block copolymer composition of claim 1.

### Claim 9 (depends on 7)

A molded product comprising the resin composition according to claim 7.

### Claim 10 (depends on 8)

A molded product comprising the resin composition according to claim 8.

### Claim 11 (depends on 1)

The block copolymer composition according to claim 1, wherein a mass ratio of the polymer (a) to the block copolymer (b) satisfies:
(a)/(b)=55/45 to 45/55.

### Claim 12 (depends on 1)

The block copolymer composition according to claim 1, wherein the vinyl aromatic monomer unit is selected from the group consisting of styrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, o-ethylstyrene, p-ethylstyrene, p-tert-butylstyrene, 2,4-dimethylstyrene, 1,3-dimethylstyrene, α-methylstyrene, α-methyl-p-methylstyrene, vinylnaphthalene, vinylanthracene, and 1,1-diphenylethylene.

### Claim 13 (depends on 1)

The block copolymer composition according to claim 1, wherein the vinyl aromatic monomer unit comprises styrene.

### Claim 14 (depends on 1)

The block copolymer composition according to claim 1, wherein the conjugated diene monomer unit is selected from the group consisting of 1,3-butadiene, 2-methyl-1,3-butadiene, 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, and 1,3-hexadiene.

### Claim 15 (depends on 1)

The block copolymer composition according to claim 1, wherein the conjugated diene monomer unit comprises 1,3-butadiene and/or 2-methyl-1,3-butadiene.