Thermoplastic transparent resin composition for wheel rust cover and method for preparing the same

Patent metadata

Field	Value
Publication number	US-10570283-B2
Application number	US-201715846036-A
Country	US
Kind code	B2
Filing date	Dec 18, 2017
Priority date	Nov 1, 2017
Publication date	Feb 25, 2020
Grant date	Feb 25, 2020

Abstract

The present disclosure relates to a thermoplastic transparent resin composition for a wheel rust cover. The thermoplastic transparent resin composition is excellent in transparency and impact strength and suitable for a vacuum compression thermal molding process. A thermoplastic transparent resin composition for a wheel rust cover includes 20 wt % to 60 wt % of a graft copolymer, 40 wt % to 70 wt % of a non-graft copolymer, and 3 wt % to 10 wt % of a processing aid, in which a total rubber content is 10 wt % to 25 wt %, a total methacrylic acid alkyl ester compound content is 34 wt % to 67 wt %, a total aromatic vinyl compound content is 16 wt % to 40 wt %, and a total vinyl cyan compound content is 0 wt % to 10 wt %.

First claim

What is claimed is:

1. A thermoplastic transparent resin composition for a wheel rust cover, the thermoplastic transparent resin composition comprising:
20 wt % to 60 wt % of a graft copolymer;
40 wt % to 70 wt % of a non-graft copolymer; and
3 wt % to 10 wt % of a processing aid,
wherein a total rubber content is 10 wt % to 25 wt %, a total methacrylic acid alkyl ester compound content is 34 wt % to 67 wt %, a total aromatic vinyl compound content is 16 wt % to 40 wt %, and a total vinyl cyan compound content is 0 wt % to 10 wt %,
wherein the processing aid is prepared by polymerizing the methacrylic acid alkyl ester compound and the aromatic vinyl compound.

2. The thermoplastic transparent resin composition of claim 1 , wherein the graft copolymer is prepared by graft-copolymerizing 18 wt % to 52 wt % of a methacrylic acid alkyl ester compound, 9 wt % to 31 wt % of an aromatic vinyl compound, and 0 wt % to 10 wt % of a vinyl cyan compound with 30 wt % to 65 wt % of a conjugated diene rubber latex.

3. The thermoplastic transparent resin composition of claim 1 , wherein the graft copolymer has a weight average molecular weight of 80,000 g/mol to 150,000 g/mol.

4. The thermoplastic transparent resin composition of claim 1 , wherein the non-graft copolymer is prepared by polymerizing 40 wt % to 74 wt % of the methacrylic acid alkyl ester compound, 20 wt % to 50 wt % of the aromatic vinyl compound, and 0 wt % to 20 wt % of the vinyl cyan compound.

5. The thermoplastic transparent resin composition of claim 1 , wherein the non-graft copolymer has a weight average molecular weight of 80,000 g/mol to 150,000 g/mol.

6. The thermoplastic transparent resin composition of claim 1 , wherein the processing aid is prepared by polymerizing 50 wt % to 75 wt % of the methacrylic acid alkyl ester compound and 25 wt % to 50 wt % of the aromatic vinyl compound.

7. The thermoplastic transparent resin composition of claim 1 , wherein the processing aid has a weight average molecular weight of 200,000 g/mol to 350,000 g/mol.

8. The thermoplastic transparent resin composition of claim 2 , wherein the methacrylic acid alkyl ester compound is methyl methacrylate,
the aromatic vinyl compound is selected from the group consisting of styrene, α-methylstyrene, o-ethylstyrene, p-ethylstyrene, vinyltoluene, and a combination thereof, and
the vinyl cyan compound is selected from the group consisting of acrylonitrile, methacrylonitrile, ethacrylonitrile, and a combination thereof.

9. The thermoplastic transparent resin composition of claim 2 , wherein a difference in refractive indices between the conjugated diene rubber latex of the graft copolymer and a polymer grafted thereto is 0.01 or less.

10. The thermoplastic transparent resin composition of claim 1 , wherein a difference in refractive indices between the graft copolymer and the non-graft copolymer is 0.01 or less,
a difference in refractive indices between the graft copolymer and the processing aid is 0.01 or less, and
a difference in refractive indices between the non-graft copolymer and the processing aid is 0.01 or less.

11. The thermoplastic transparent resin composition of claim 1 , wherein the graft copolymer, the non-graft copolymer, and the processing aid have the same refractive index.

12. The thermoplastic transparent resin composition of claim 1 , further comprising: an additive selected from the group consisting of a heat stabilizer, a UV stabilizer, a lubricant, and a combination thereof.

13. A method for preparing a thermoplastic transparent resin composition for a wheel rust cover, the method comprising:
preparing a graft copolymer;
preparing a non-graft copolymer;
preparing a processing aid; and
kneading 20 wt % to 60 wt % of the graft copolymer, 40 wt % to 70 wt % of the non-graft copolymer, and 3 wt % to 10 wt % of the processing aid,
wherein a total rubber content is 10 wt % to 25 wt %, a total methacrylic acid alkyl ester compound content is 34 wt % to 67 wt %, a total aromatic vinyl compound content is 16 wt % to 40 wt %, and a total vinyl cyan compound content is 0 wt % to 10 wt %,
wherein the processing aid is prepared by polymerizing the methacrylic acid alkyl ester compound and the aromatic vinyl compound.

14. The method of claim 13 , wherein the graft copolymer is prepared by graft-copolymerizing 18 wt % to 52 wt % of a methacrylic acid alkyl ester compound, 9 wt % to 31 wt % of an aromatic vinyl compound, and 0 wt % to 10 wt % of a vinyl cyan compound with 30 wt % to 65 wt % of a conjugated diene rubber latex.

15. The method of claim 13 , wherein the graft copolymer is prepared so as to have a weight average molecular weight of 80,000 g/mol to 150,000 g/mol by adding a molecular weight adjusting agent.

16. The method of claim 13 , wherein the non-graft copolymer is prepared by polymerizing 40 wt % to 74 wt % of the methacrylic acid alkyl ester compound, 20 wt % to 50 wt % of the aromatic vinyl compound, and 0 wt % to 20 wt % of the vinyl cyan compound.

17. The method of claim 13 , wherein the non-graft copolymer is prepared so as to have a weight average molecular weight of 80,000 g/mol to 150,000 g/mol by adding a molecular weight adjusting agent.

18. The method of claim 13 , wherein the processing aid is prepared by polymerizing 50 wt % to 75 wt % of the methacrylic acid alkyl ester compound and 25 wt % to 50 wt % of the aromatic vinyl compound.

19. The method of claim 13 , wherein the processing aid is prepared so as to have a weight average molecular weight of 200,000 g/mol to 350,000 g/mol by adding a molecular weight adjusting agent.

20. The method of claim 13 , wherein the graft copolymer, the non-graft copolymer, and the processing aid are prepared by means of an emulsion polymerization or a suspension polymerization.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp
• Lg Chemical Ltd

Inventors

• Choi Min Ho
• Lee Won Seok
• Jang Seok Goo
• Choi Jeong Su

Classifications

• B60B7/0033

  the dominant aspect being the surface appearance · CPC title

• C08L2205/06

  having improved processability or containing aids for moulding methods · CPC title

• C08F279/04

  Vinyl aromatic monomers and nitriles as the only monomers · CPC title

• C08L51/06

  grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond · CPC title

• C08L51/003

  grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds (C08L51/04, C08L51/06 take precedence) · CPC title