Thermoplastic resin composition and molded article

Patent metadata

Field	Value
Publication number	US-10189984-B2
Application number	US-201615542847-A
Country	US
Kind code	B2
Filing date	Nov 30, 2016
Priority date	Dec 10, 2015
Publication date	Jan 29, 2019
Grant date	Jan 29, 2019

Abstract

The present invention relates to a thermoplastic resin composition and a molded article manufactured thereofrom. In accordance with the present invention, a thermoplastic resin composition providing higher chemical resistance with respect to a blowing agent while providing the same impact strength, gloss, and vacuum moldability as existing resin compositions when used to produce an inner case of a refrigerator, and a molded article manufactured from the same are provided.

First claim

The invention claimed is:

1. A thermoplastic resin composition, comprising:
100 parts by weight of a base resin that comprises greater than 0% by weight to 35% by weight of a diene-based graft copolymer, greater than 0% by weight to 30% by weight of an acrylic graft copolymer, and 35 to 85% by weight of a copolymer of a vinyl cyanide compound and an aromatic vinyl compound; and
greater than 1 part by weight of a polyester-based elastomer having a melt index of 0.1 to 10 g/10 min (230° C., 2.16 kg).

2. The thermoplastic resin composition according to claim 1 , wherein the diene-based graft copolymer is a copolymer prepared by graft polymerizing 30 to 70% by weight of a diene-based rubbery polymer; and 30 to 70% by weight of a sum of an aromatic vinyl compound and a vinyl cyanide compound,
wherein the vinyl cyanide compound is comprised in an amount of 20 to 40% by weight based on 100% by weight of a total of the compounds.

3. The thermoplastic resin composition according to claim 2 , wherein the diene-based rubbery polymer has an average particle diameter of 0.2 to 0.4 μm.

4. The thermoplastic resin composition according to claim 1 , wherein the acrylic graft copolymer is a copolymer prepared by graft polymerizing 30 to 70% by weight of an acrylic rubbery polymer; and 30 to 70% by weight of a sum of the aromatic vinyl compound and the vinyl cyanide compound,
wherein the vinyl cyanide compound is comprised in an amount of 20 to 40% by weight based on 100% by weight of a total of the compounds.

5. The thermoplastic resin composition according to claim 4 , wherein the acrylic graft copolymer has an average particle diameter of 0.3 to 0.6 μm.

6. The thermoplastic resin composition according to claim 1 , wherein the acrylic graft copolymer is comprised in an amount of 5 to 30% by weight based on 100% by weight of the base resin.

7. The thermoplastic resin composition according to claim 1 , wherein the copolymer of the vinyl cyanide compound and the aromatic vinyl compound is a copolymer prepared by polymerizing 55 to 95% by weight of an aromatic vinyl compound and 5 to 45% by weight of a vinyl cyanide compound.

8. The thermoplastic resin composition according to claim 1 , wherein the polyester-based elastomer is prepared by solid-state polymerizing a resin that is prepared by melt polymerizing aromatic dicarboxylic acid or an ester-forming derivative thereof, aliphatic diol, and polyalkylene oxide.

9. The thermoplastic resin composition according to claim 1 , wherein the polyester-based elastomer has a Shore D hardness of 35 to 55.

10. The thermoplastic resin composition according to claim 1 , wherein the polyester-based elastomer is comprised in an amount of greater than 1 part by weight to 20 parts by weight based on 100 parts by weight of the base resin.

11. The thermoplastic resin composition according to claim 1 , wherein the thermoplastic resin composition is used as a base of a polyurethane foam sheet.

12. The thermoplastic resin composition according to claim 11 , wherein the polyurethane foam sheet is a polyurethane sheet foamed with a blowing agent that comprise a fluoroalkene compound having 2 to 6 carbon atoms and has a Global Warming Potential (GWP) of less than 7.

13. The thermoplastic resin composition according to claim 1 , wherein, after immersing the thermoplastic resin composition in a blowing agent, which comprise a fluoroalkene compound having 2 to 6 carbon atoms and has a Global Warming Potential (GWP) of less than 7, at −40° C. for 20 hr, the thermoplastic resin composition exhibits a surface crack generation rate of 0%.

14. The thermoplastic resin composition according to claim 1 , wherein the thermoplastic resin composition has an Izod impact strength of greater than 20 kgf.cm/cm.

15. The thermoplastic resin composition according to claim 1 , wherein the thermoplastic resin composition has a high-temperature tensile strength of greater than 4.5 kgf/cm 2 (measured at 150° C.).

16. A molded article comprising the thermoplastic resin composition according to claim 1 .

17. The molded article according to claim 16 , wherein the molded article is an extruded sheet for an inner case.

Assignees

• Lg Chemical Ltd

Inventors

• Kim Seo Hwa
• Kim Seong Lyong
• Kim Tae Hoon
• Lee Ju Hyeong

Classifications

• C08J2325/12

  with unsaturated nitriles · CPC title

• C08J2451/06

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

• C08L75/04

  Polyurethanes · CPC title

• C08L2205/035

  containing four or more polymers in a blend · CPC title

• C08J2451/04

  grafted on to rubbers · CPC title