# US 12,006,429 B2 · Thermoplastic resin composition

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- Number: US 12,006,429 B2
- Document ID: US12006429B2
- Status: Granted
- Kind: B2
- Application number: 17/051,740
- Filed: 2019-09-11
- Published: 2021-08-05
- Granted: 2024-06-11
- Earliest claimed: 2018-09-21
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Seo Hwa Kim; Byoung Il Kang; Eun Jung Choi; Taek Jun Jung; Jeong In Cho; Dong Kun Shin
- Web page: https://patentgrep.com/patent/US12006429B2

## CPC

- C08L 55/02: ABS [Acrylonitrile-Butadiene-Styrene] polymers
- C08F 279/04: Vinyl aromatic monomers and nitriles as the only monomers
- C08L 25/12: with unsaturated nitriles
- C08L 33/20: Homopolymers or copolymers of acrylonitrile (C08L55/02 takes precedence)
- C08L 2205/02: containing two or more polymers of the same C08L -group
- C08L 2205/025: containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
- C08L 2205/03: containing three or more polymers in a blend
- 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

## Abstract

The present invention provides a thermoplastic resin composition which includes: a first copolymer including a core including a conjugated diene-based polymer and a shell including an aromatic vinyl-based monomer unit and a vinyl cyan-based monomer unit; and a second copolymer including an aromatic vinyl-based monomer unit and a vinyl cyan-based monomer unit, wherein the first copolymer has a degree of grafting of 32 to 50%, the second copolymer has a weight-average molecular weight of 85,000 to 115,000 g/mol, and the thermoplastic resin composition includes the first copolymer at 30 wt % or less and an oligomer residue at 1.1 wt % or less. Specifically, the thermoplastic resin composition can shorten an injection molding time.

## Claims

### Claim 1

A thermoplastic resin composition comprising:
a first copolymer including a conjugated diene-based polymer, an aromatic vinyl-based monomer unit, and a vinyl cyan-based monomer unit; and
a second copolymer including an aromatic vinyl-based monomer unit and a vinyl cyan-based monomer unit,
wherein the first copolymer has a degree of grafting of 32 to 50%,
the second copolymer has a weight-average molecular weight of 85,000 to 115,000 g/mol, and
the thermoplastic resin composition includes 30 wt % or less of the first copolymer and 1.1 wt % or less of an oligomer residue.

### Claim 2 (depends on 1)

The thermoplastic resin composition of claim 1, wherein the second copolymer is 90,000 g/mol to 115,000 g/mol.

### Claim 3 (depends on 1)

The thermoplastic resin composition of claim 1, which includes 1 wt % or less of an oligomer residue.

### Claim 4 (depends on 1)

The thermoplastic resin composition of claim 1, which has a melt flow index of 30 g/10 min or more, as measured at 220° C. and 10 kg.

### Claim 5 (depends on 1)

The thermoplastic resin composition of claim 1, which has a melt flow index of 30 to 50 g/10 min, as measured at 220° C. and 10 kg.

### Claim 6 (depends on 1)

The thermoplastic resin composition of claim 1, wherein the first copolymer has a degree of grafting of 35 to 45%.

### Claim 7 (depends on 1)

The thermoplastic resin composition of claim 1, wherein a shell of the first copolymer has a weight-average molecular weight of 55,000 to 95,000 g/mol.

### Claim 8 (depends on 1)

The thermoplastic resin composition of claim 1, wherein the conjugated diene-based polymer has an average particle diameter of 0.05 to 0.5 μm.

### Claim 9 (depends on 1)

The thermoplastic resin composition of claim 1, wherein the first copolymer includes 1.5 wt % or less of an oligomer residue.

### Claim 10 (depends on 1)

The thermoplastic resin composition of claim 1, wherein the second copolymer includes 1.6 wt % or less of an oligomer residue.

### Claim 11 (depends on 1)

The thermoplastic resin composition of claim 1, which includes:
to 30 wt % of the first copolymer; and
70 to 90 wt % of the second copolymer.