RUBBER POLYMER, GRAFT COPOLYMER, PREPARATION METHODS THEREFOR, AND IMPACT RESISTANT AND HEAT RESISTANT RESIN COMPOSITION

• US 20180201715A1
• Filed: 03/16/2018
• Published: 07/19/2018
• Est. Priority Date: 09/30/2013
• Status: Active Grant

• Current Assignee: LG Chem Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: CHAI, Joo Byung, JUNG, Yu Sung, PARK, Eun Seon, JEON, Tae Young, KIM, Young Min, LEE, Jin Ho
• Granted Patent: US 10,640,596 B2
• Time in Patent Office: Days
• CPC Class Codes: C08F 236/10 with vinyl-aromatic monomers
• CPC Class Codes: C08F 279/04 Vinyl aromatic monomers and nitriles as the only monomers
• CPC Class Codes: C08L 2201/08 Stabilised against heat, light or radiation or oxydation
• CPC Class Codes: C08L 25/12 with unsaturated nitriles
• CPC Class Codes: C08L 25/16 Homopolymers or copolymers of alkyl-substituted styrenes
• CPC Class Codes: C08L 51/04 grafted on to rubbers
• CPC Class Codes: C08L 9/00 Compositions of homopolymers or copolymers of conjugated diene hydrocarbons

Abstract

Disclosed are a rubber polymer, a graft copolymer, methods of preparing the same, and an impact and heat resistant resin composition. According to the present invention, provided are rubber latex and a graft copolymer which may realize a product having superior impact resistance, heat resistance and chemical resistance by adding a specific crosslinking regulator to the rubber polymer, methods of preparing the same, and an impact and heat resistant resin composition.

Claims

1. A rubber polymer that is an emulsion polymer of a diene-based monomer, the rubber polymer comprising a crosslinking regulator in an amount of 5% to 20% by weight based on 100% by weight in a total of monomers constituting the polymer.

2. The rubber polymer according to claim 1, wherein the crosslinking regulator is a polymer of crosslinking control monomers.

3. The rubber polymer according to claim 1, wherein the rubber polymer has a gel content of 70% to less than 95%.

4. The rubber polymer according to claim 1, wherein the rubber polymer has a gel content of 70% to 75%.

5. The rubber polymer according to claim 1, wherein the rubber polymer has a swelling index of 15 to less than 25 when the rubber polymer is exposed to toluene for 24 hours.

6. The rubber polymer according to claim 1, wherein the rubber polymer has a swelling index of 15 to 20 when the rubber polymer is exposed to toluene for 24 hours.

7. The rubber polymer according to claim 6, wherein the crosslinking regulator is a polymer of at least one styrene-based monomer selected from styrene, α

-methylstyrene, α

-methyl-4-butylstyrene, 4-phenyl styrene, 2,5-dimethylstyrene, 2-methylstyrene, α

-methyl-3,5-di-t-butylstyrene, α

-methyl-3,4,5-trimethylstyrene, α

-methyl-4-benzylstyrene and α

-methyl-4-cyclohexylstyrene.

8. The rubber polymer according to claim 6, wherein the crosslinking regulator is a polymer of one or more acrylic acid ester-based monomers selected from methyl methacrylate, methyl acrylate, ethylacrylate, butylacrylate and 2-ethylhexyl acrylate.

9. The rubber polymer according to claim 6, wherein the crosslinking regulator is a polymer of one or more vinyl cyanide monomers selected from acrylonitrile, methacrylonitrile, and ethacrylonitrile.

10. The rubber polymer according to claim 6, wherein the crosslinking regulator is a polymer of one or more unsaturated carboxylic acids selected from acrylic acid, maleic acid, methacrylic acid, itaconic acid and fumaric acid.

11. An impact and heat resistant resin composition comprising a graft copolymer and a heat resistant thermoplastic resin, wherein a graft copolymer comprising the crosslinking regulator-comprising rubber polymer of claim 1 is comprised in an amount of 50% to 80% by weight based on 100% by weight of the composition.

12. The impact and heat resistant resin composition according to claim 11, wherein the heat resistant thermoplastic resin is one or more selected from an α

-methylstyrene-acrylonitrile-styrene copolymer (AMS-SAN), an acrylonitrile-styrene copolymer (SAN), acrylonitrile-styrene-methyl methacrylate (MS), polycarbonate (PC), polybutylene terephthalate (PBT), and polyvinyl chloride (PVC).

13. The impact and heat resistant resin composition according to claim 12, wherein the heat resistant thermoplastic resin is comprised in an amount of 20% to 50% by weight based on the composition.

14. The impact and heat resistant resin composition according to claim 12, wherein the heat resistant thermoplastic resin is a polymer of 65 to 80% by weight of one or more styrene-based monomers selected from styrene, α

-methylstyrene, α

-methyl-4-butylstyrene, 4-phenyl styrene, 2,5-dimethyl styrene, 2-methylstyrene, α

-methyl-3,5-di-t-butylstyrene, α

-methyl-3,4,5-trimethylstyrene, α

-methyl-4-benzylstyrene and α

-methyl-4-cyclohexylstyrene, and 20% to 35% by weight of one or more vinyl cyanide monomers selected from acrylonitrile, methacrylonitrile and ethacrylonitrile.

15. The impact and heat resistant resin composition according to claim 12, wherein the heat resistant thermoplastic resin is a polymer of one or more 64% to 75% by weight of styrene-based derivatives selected from α

-methylstyrene, α

-methyl-4-butylstyrene, 4-phenyl styrene, 2,5-dimethyl styrene, 2-methylstyrene, α

-methyl-3,5-di-t-butylstyrene, α

-methyl-3,4,5-trimethylstyrene, α

-methyl-4-benzylstyrene and α

-methyl-4-cyclohexylstyrene, 20% to 35% by weight one or more vinyl cyanide monomers selected from acrylonitrile, methacrylonitrile and ethacrylonitrile, and 1% to 5% by weight of styrene.

16. An impact and heat resistant resin composition comprising:

50% to 80% of a graft copolymer comprising;

50% to 80% by weight of a butadiene rubber polymer component comprising a crosslinking regulator in an amount of 5% to 20% by weight of the butadiene rubber polymer component; and

20% to 50% by weight of one or more monomer selected from a styrene-based monomer, a vinyl cyanide monomer and a (methyl)acrylic acid ester monomer, and 20% to 50% of a heat resistant thermoplastic resin comprising an α

-methylstyrene-acrylonitrile-styrene copolymer (AMS-SAN), an acrylonitrile-styrene copolymer (SAN), acrylonitrile-styrene-methyl methacrylate (MS), polycarbonate (PC), polybutylene terephthalate (PBT) or polyvinyl chloride (PVC).