Thermoplastic resin composition

Patent metadata

Field	Value
Publication number	US-11299615-B2
Application number	US-201917047374-A
Country	US
Kind code	B2
Filing date	Sep 5, 2019
Priority date	Sep 5, 2018
Publication date	Apr 12, 2022
Grant date	Apr 12, 2022

Abstract

The present invention provides a thermoplastic resin composition which includes: A-1) a first copolymer including a first conjugated diene-based polymer, an alkyl (meth)acrylate-based monomer unit, and an aromatic vinyl-based monomer unit, wherein the first conjugated diene-based polymer has an average particle diameter of 0.05 to 0.2 μm; A-2) a second copolymer including a second conjugated diene-based polymer, an alkyl (meth)acrylate-based monomer unit, and an aromatic vinyl-based monomer unit, wherein the second conjugated diene-based polymer has an average particle diameter of 0.23 to 0.5 μm; B) a third copolymer including an alkyl (meth)acrylate-based monomer unit and an aromatic vinyl-based monomer unit; and C) a plasticizer having a viscosity of 700 to 10,000 cP, wherein the plasticizer is included at 0.3 to 5 wt %. The thermoplastic resin composition is excellent in all of transparency, impact resistance, and flowability.

First claim

The invention claimed is:

1. A thermoplastic resin composition comprising:
A-1) a first copolymer including a first conjugated diene-based polymer, an alkyl (meth)acrylate-based monomer unit, and an aromatic vinyl-based monomer unit, wherein the first conjugated diene-based polymer has an average particle diameter of 0.05 to 0.2 μm;
A-2) a second copolymer including a second conjugated diene-based polymer, an alkyl (meth)acrylate-based monomer unit, and an aromatic vinyl-based monomer unit, wherein the second conjugated diene-based polymer has an average particle diameter of 0.23 to 0.5 μm;
B) a third copolymer including an alkyl (meth)acrylate-based monomer unit and an aromatic vinyl-based monomer unit; and
C) a plasticizer having a viscosity of 700 to 10,000 cP,
wherein the plasticizer is included at 0.3 to 5 wt %.

2. The thermoplastic resin composition of claim 1 , wherein C) the plasticizer has a refractive index of 1.45 or more.

3. The thermoplastic resin composition of claim 1 , wherein C) the plasticizer includes an aliphatic dicarboxylic acid-based monomer unit and an aliphatic dihydroxy-based monomer unit.

4. The thermoplastic resin composition of claim 3 , wherein C) the plasticizer further includes one or more selected from the group consisting of an aliphatic ester-based monomer unit and an acetate-based monomer unit.

5. The thermoplastic resin composition of claim 1 , wherein A-1) the first copolymer has a degree of grafting of 40 to 80%.

6. The thermoplastic resin composition of claim 1 , wherein A-2) the second copolymer has a degree of grafting of 35 to 70%.

7. The thermoplastic resin composition of claim 1 , wherein the refractive indices of the first to third copolymers differ by 0.01 or less.

8. The thermoplastic resin composition of claim 1 , wherein the first to third copolymers further includes a vinyl cyan-based monomer unit.

9. The thermoplastic resin composition of claim 1 , which includes:
A-1) the first copolymer at 5 to 40 wt %;
A-2) the second copolymer at 10 to 40 wt %;
B) the third copolymer at 20 to 75 wt %; and
C) the plasticizer at 0.3 to 5 wt %.

10. The thermoplastic resin composition of claim 1 , which includes:
the first conjugated diene-based polymer at 3 to 20 wt %;
the second conjugated diene-based polymer at 3 to 20 wt %;
the alkyl (meth)acrylate-based monomer unit at 45 to 65 wt %;
the aromatic vinyl-based monomer unit at 10 to 30 wt %; and
the plasticizer at 0.3 to 5 wt %.

11. The thermoplastic resin composition of claim 1 , which has a degree of grafting of 35 to 65%.

12. The thermoplastic resin composition of claim 1 , which has a melt flow index of 15 to 45 g/10 min, as measured at 220° C.

13. A thermoplastic resin molded article made of the thermoplastic resin composition of claim 1 and comprising an impact modifying part and a matrix part,
wherein the impact modifying part includes one or more selected from the group consisting of a first conjugated diene-based polymer and a second conjugated diene-based polymer,
the matrix part includes an alkyl (meth)acrylate-based monomer unit and an aromatic vinyl-based monomer unit, and
the refractive index of the impact modifying part and the refractive index of the matrix part differ by 0.01 or less.

14. The thermoplastic resin molded article of claim 13 , which has a haze value of 1.3 or less and an impact strength of 7 kg·cm/cm or more.

Assignees

• Lg Chemical Ltd

Inventors

• Choi Jeong Su
• Yoo Keun Hoon
• Lee Won Seok
• Lee Roo Da
• Lee Jong Ju

Classifications

• C08K5/0016

  Plasticisers · CPC title

• C08L2205/035

  containing four or more polymers in a blend · CPC title

• C08L51/04 Primary

  grafted on to rubbers · CPC title

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title

• C08L2207/53

  Core-shell polymer · CPC title