Acrylate-styrene-acrylonitrile polymer and thermoplastic resin composition

Patent metadata

Field	Value
Publication number	US-9637622-B2
Application number	US-201414771191-A
Country	US
Kind code	B2
Filing date	Aug 20, 2014
Priority date	Aug 20, 2013
Publication date	May 2, 2017
Grant date	May 2, 2017

Abstract

The present invention relates to an acrylate-styrene-acrylonitrile polymer, a method for preparing the same, and a thermoplastic resin composition. More specifically, the present invention has an effect of providing an acrylate-styrene-acrylonitrile polymer, a method for preparing the same, and a thermoplastic resin composition, wherein an N-vinyl monomer is applied such that the polymerization can be initiated by a redox system under conditions in which a grafting agent is not used, thereby improving the grafting efficiency of the acrylate-styrene-acrylonitrile polymer and thus improving powder characteristics and impact resistance while maintaining dye-ability; the content of free shells is lowered to improve the coagulation and latex stability; the polymerization is performed by the redox system without an activation liquid of a shell layer, thereby reducing additives and thus improving pigment dye-ability and significantly improving weather resistance.

First claim

What is claimed is:

1. An acrylate-styrene-acrylonitrile copolymer comprising:
a core including an acrylic rubber;
a shell including styrene acrylonitrile resin (SAN); and
a monomer layer including an amine group, the monomer layer being disposed between the core and the shell,
wherein the shell is a graft shell that lacks an activating solution.

2. The acrylate-styrene-acrylonitrile copolymer according to claim 1 , wherein the monomer layer envelops the core.

3. The acrylate-styrene-acrylonitrile copolymer according to claim 2 , wherein an amount of the monomer layer is 0.05 to 1 part by weight based on a total weight of the copolymer.

4. The acrylate-styrene-acrylonitrile copolymer according to claim 2 , wherein the core is a soft core, and comprises C 1 to C 8 alkyl acrylate and a peroxide initiator.

5. The acrylate-styrene-acrylonitrile copolymer according to claim 2 , wherein the core and the monomer layer comprise a structure including 90 to 99.99% by weight of the core and 0.01 to 10% by weight of the monomer layer.

6. The acrylate-styrene-acrylonitrile copolymer according to claim 2 , wherein the core further comprises a cross-linking acrylic agent and a grafting agent.

7. The acrylate-styrene-acrylonitrile copolymer according to claim 2 , wherein the core includes an emulsion polymer comprising 85 to 99.89% by weight of an acrylic compound and 0.1 to 5% by weight of a cross-linking agent.

8. The acrylate-styrene-acrylonitrile copolymer according to claim 2 , wherein the monomer layer is an emulsion polymer comprising 0 to 5% by weight of an acrylic compound, 0.01 to 5% by weight of an amine based monomer, and 0 to 0.5% by weight of a cross-linking agent.

9. The acrylate-styrene-acrylonitrile copolymer according to claim 2 , wherein a weight ratio of a monomer constituting the core to a monomer constituting the shell is 40:60 to 80:20, based on a total weight of the copolymer.

10. The acrylate-styrene-acrylonitrile copolymer according to claim 1 , wherein the monomer layer comprises a monomer selected from at least one of N-vinylformamide, N-vinylacetamide, N-vinylpropionamide, N-vinyl butyramide, N-vinyl 2-methyl propionamide, N-methyl acrylamide, N-ethyl acrylamide, N-n-propyl acrylamide, N-n-butyl acrylamide, N-isopropyl acrylamide, O-benzyl-N-vinylcarbamate, methyl N-vinylcarbamate, and N-vinyl tert-butyl carbamate.

11. The acrylate-styrene-acrylonitrile copolymer according to claim 1 , wherein the monomer layer is a first monomer layer, and
wherein the core envelops a seed having a second monomer layer.

12. The acrylate-styrene-acrylonitrile copolymer according to claim 11 , wherein an amount of the second monomer layer is in a range of greater than 0.001 and less than 1 part by weight, based on a total weight of the copolymer.

13. The acrylate-styrene-acrylonitrile copolymer according to claim 11 , wherein the seed has a two-layer structure that comprises a hard seed and the second monomer layer, the two-layer structure comprising at least one monomer selected from C 1 to C 8 alkyl (meth)acrylate based monomers, styrene based monomers and acrylonitrile based monomers, a persulfate initiator or a peroxide initiator, a cross-linking agent, and an emulsifier.

14. The acrylate-styrene-acrylonitrile copolymer according to claim 13 , wherein a gel content of the hard seed is 95.0 to 99.8%.

15. The acrylate-styrene-acrylonitrile copolymer according to claim 11 , wherein the core lacks the activating solution and a gel content of the acrylic rubber core is 85.0 to 99.5%.

16. The acrylate-styrene-acrylonitrile copolymer according to claim 11 , wherein a weight ratio of a monomer constituting the seed to a monomer constituting the core to a monomer constituting the shell is 5 to 15:25 to 75:20 to 60.

17. The acrylate-styrene-acrylonitrile copolymer according to claim 1 , wherein the shell is a hard shell comprising at least one monomer selected from C 1 to C 8 alkyl (meth)acrylate based monomers, styrene based monomers, and acrylonitrile based monomers.

18. The acrylate-styrene-acrylonitrile copolymer according to claim 1 , wherein the core and the shell comprise a structure including 40 to 80% by weight of the core, 19 to 40% by weight of an aromatic vinyl compound, and 1 to 20% by weight of a vinyl cyano compound.

19. The acrylate-styrene-acrylonitrile copolymer according to claim 1 , wherein the acrylate-styrene-acrylonitrile copolymer has 70% grafting efficiency or more.

20. A thermoplastic resin composition comprising a thermoplastic resin and an impact modifier, wherein the impact modifier comprises the acrylate-styrene-acrylonitrile copolymer according to claim 2 , and the thermoplastic resin is a hard matrix resin.

Assignees

• Lg Chemical Ltd

Inventors

• Park Chun Ho
• Kim Min Jung
• Hwang Yong Yeon
• Kang Eun Soo
• Lee Sang Mi
• Lee Yeong Min

Classifications

• C08F265/04 Primary

  on to polymers of esters · CPC title

• C08F226/02

  by a single or double bond to nitrogen · CPC title

• C08L33/08

  Homopolymers or copolymers of acrylic acid esters · CPC title

• C08F220/44

  Acrylonitrile · CPC title

• C08F285/00

  Macromolecular compounds obtained by polymerising monomers on to preformed graft polymers · CPC title