Heat-resistant SAN resin, method of producing the same and heat-resistant SAN resin composition comprising the same

Patent metadata

Field	Value
Publication number	US-9777088-B2
Application number	US-201515106785-A
Country	US
Kind code	B2
Filing date	Dec 14, 2015
Priority date	Apr 27, 2015
Publication date	Oct 3, 2017
Grant date	Oct 3, 2017

Abstract

Disclosed are a heat-resistant SAN resin, a method of producing the same and a heat-resistant SAN resin composition comprising the same. More specifically, disclosed are a heat-resistant SAN resin produced using ingredients comprising 52 to 78% by weight of alpha-methylstyrene, 20 to 40% by weight of a vinyl cyanide compound and 2 to 8% by weight of hydroxyalkyl (meth)acrylate, a method of producing the same and a heat-resistant SAN resin composition comprising the same. Advantageously, provided are a heat-resistant SAN resin with maintained heat resistance, improved polymerization conversion rate and increased weight average molecular weight, a method of producing the same, and a heat-resistant SAN resin composition containing the same with excellent chemical resistance, superior mechanical properties and good balance between properties.

First claim

What is claimed is:

1. A heat-resistant SAN resin produced using ingredients comprising 52 to 78% by weight of alpha-methylstyrene, 20 to 40% by weight of a vinyl cyanide compound and 2 to 8% by weight of hydroxyalkyl (meth)acrylate,
wherein the heat-resistant SAN resin has a weight average molecular weight of 79,000 g/mol or more.

2. The heat-resistant SAN resin according to claim 1 , wherein the vinyl cyanide compound comprises one or more selected from the group consisting of acrylonitrile, methacrylonitrile and ethacrylonitrile.

3. The heat-resistant SAN resin according to claim 1 , wherein the hydroxyalkyl (meth)acrylate comprises one or more selected from the group consisting of hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 3-hydroxypropyl acrylate, 2-hydroxybutyl acrylate, 4-hydroxybutyl acrylate, 3-hydroxypentyl acrylate, 6-hydroxynonyl acrylate, hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 3-hydroxypropyl methacrylate, 2-hydroxybutyl methacrylate, 2-hydroxypentyl methacrylate, 5-hydroxypentyl methacrylate, 7-hydroxyheptyl methacrylate and 5-hydroxydecyl methacrylate.

4. The heat-resistant SAN resin according to claim 1 , wherein the heat-resistant SAN resin has an oligomer content of 0.1 to 0.8% by weight.

5. A method of producing a heat-resistant SAN resin comprising a step for bulk polymerizing ingredients comprising 52 to 78% by weight of alpha-methylstyrene, 20 to 40% by weight of a vinyl cyanide compound and 2 to 8% by weight of hydroxyalkyl (meth)acrylate,
wherein the bulk polymerization has a polymerization conversion rate of 63 to 76%.

6. The method according to claim 5 , wherein the bulk polymerization is continuous polymerization.

7. The method according to claim 5 , wherein the bulk polymerization is carried out at 105 to 120° C.

8. A heat-resistant SAN resin composition comprising:
a heat-resistant SAN resin polymerized using ingredients comprising 52 to 78% by weight of alpha-methylstyrene, 20 to 40% by weight of a vinyl cyanide compound and 2 to 8% by weight of hydroxyalkyl (meth)acrylate, wherein the heat-resistant SAN resin has a weight average molecular weight of 79,000 g/mol or more; and
an ABS resin.

9. The heat-resistant SAN resin composition according to claim 8 , wherein the heat-resistant SAN resin is present in an amount of 60 to 90% by weight and the ABS resin is present in an amount of 10 to 40% by weight.

10. The heat-resistant SAN resin composition according to claim 8 , wherein the heat-resistant SAN resin composition has a tensile elongation of 23% or higher.

11. The heat-resistant SAN resin composition according to claim 8 , wherein the heat-resistant SAN resin composition has an impact strength of 19 J/m or higher.

12. The heat-resistant SAN resin composition according to claim 8 , wherein the heat-resistant SAN resin composition has an environmental stress cracking resistance (ESCR) of 28 seconds or longer,
wherein the ESCR is a crack generation time measured after applying a thinner to the center of a specimen using a 1% strain jig.

13. An article produced from the heat-resistant SAN resin composition according to claim 8 .

14. The heat-resistant SAN resin composition of claim 8 , wherein the heat-resistant SAN resin has an oligomer content of 0.1 to 0.8% by weight.

Assignees

• Lg Chemical Ltd

Inventors

• Kang Byoung Il
• Choi Eun Jung
• Sung Da Eun
• Han Chang Hun

Classifications

• C08L25/12

  with unsaturated nitriles · CPC title

• C08F279/04 Primary

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

• C08F212/10 Primary

  with nitriles · CPC title

• C08L25/16

  Homopolymers or copolymers of alkyl-substituted styrenes · CPC title

• C08F212/12

  Monomers containing a branched unsaturated aliphatic radical or a ring substituted by an alkyl radical · CPC title