# US 12,595,326 B2 · Thermoplastic resin composition

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- Number: US 12,595,326 B2
- Document ID: US12595326B2
- Status: Granted
- Kind: B2
- Application number: 17/762,468
- Filed: 2021-03-31
- Published: 2022-10-27
- Granted: 2026-04-07
- Earliest claimed: 2020-05-21
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Jeong Su Choi; Won Seok Lee; Roo Da Lee; Sang Hoo Park; Jong Ju Lee; Seung Je Oh
- Web page: https://patentgrep.com/patent/US12595326B2

## CPC

- C08F 220/44: Acrylonitrile
- C08L 9/06: Copolymers with styrene
- C08F 212/08: Styrene
- C08F 220/06: Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
- C08F 220/14: Methyl esters {, e.g. methyl (meth)acrylate}
- C08F 236/10: with vinyl-aromatic monomers
- C08F 257/02: on to polymers of styrene or alkyl-substituted styrenes
- C08F 265/06: Polymerisation of acrylate or methacrylate esters on to polymers thereof
- C08F 279/02: on to polymers of conjugated dienes
- C08L 9/02: Copolymers with acrylonitrile
- C08L 51/04: grafted on to rubbers
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

Provided is a thermoplastic resin composition which includes: a rubber polymer including a first styrene-based monomer unit and a diene-based monomer unit in a weight ratio of 10:90 to 35:65 and having an average particle diameter of 250 to 450 nm; a (meth)acrylate-based monomer unit; and a second styrene-based monomer unit, wherein a weight ratio of the (meth)acrylate-based monomer unit to the second styrene-based monomer unit is 2 or less, and a weight-average molecular weight ranges from 130,000 to 250,000 g/mol.

## Claims

### Claim 1

A thermoplastic resin composition comprising:
a graft copolymer, and
a non-grafted copolymer,
wherein the graft copolymer includes:
a rubber polymer having an average particle diameter of from 250 to 450 nm and including a first styrene-based monomer unit and a diene-based monomer unit in a weight ratio of 10:90 to 35:65,
a (meth)acrylate-based monomer unit grafted onto the rubber polymer, and
a second styrene-based monomer unit grafted onto the rubber polymer;
wherein the non-grafted copolymer includes:
the (meth)acrylate-based monomer unit, and
the second styrene-based monomer unit;
wherein a weight ratio of the (meth)acrylate-based monomer unit, which is all of the (meth)acrylate-based monomer units included in the thermoplastic resin composition, to the second styrene-based monomer unit, which is all of the second styrene-based monomer units included in the thermoplastic resin composition, is 2 or less; and
wherein the thermoplastic resin composition has a weight-average molecular weight of from 130,000 to 250,000 g/mol.

### Claim 2 (depends on 1)

The thermoplastic resin composition of claim 1, wherein the weight ratio of the (meth)acrylate-based monomer unit to the second styrene-based monomer unit ranges from 0.80 to 2.00.

### Claim 3 (depends on 1)

The thermoplastic resin composition of claim 1, wherein the thermoplastic resin composition has a weight-average molecular weight of from 140,000 to 210,000 g/mol.

### Claim 4 (depends on 1)

The thermoplastic resin composition of claim 1, wherein the thermoplastic resin composition includes:
the rubber polymer in an amount of from 20.00 to 40.00 wt %;
the (meth)acrylate-based monomer unit in an amount of from 23.00 to 51.00 wt %; and
the second styrene-based monomer unit in an amount of from 18.00 to 41.00 wt %.

### Claim 5 (depends on 1)

The thermoplastic resin composition of claim 1, further comprising an acrylonitrile-based monomer unit.

### Claim 6 (depends on 5)

The thermoplastic resin composition of claim 5, wherein the thermoplastic resin composition includes the acrylonitrile-based monomer unit in an amount of from 3.00 to 12.00 wt %.

### Claim 7 (depends on 1)

The thermoplastic resin composition of claim 1, wherein the graft copolymer has a refractive index of from 1.5230 to 1.5420.

### Claim 8 (depends on 1)

The thermoplastic resin composition of claim 1, wherein the graft copolymer has a weight-average molecular weight of from 70,000 to 250,000 g/mol.

### Claim 9 (depends on 1)

The thermoplastic resin composition of claim 1, wherein the non-grafted copolymer has a weight-average molecular weight of from 140,000 to 250,000 g/mol.

### Claim 10 (depends on 1)

The thermoplastic resin composition of claim 1, wherein the thermoplastic resin composition has a weight-average molecular weight of from 170,000 to 190,000 g/mol.