LOW SURFACE GLOSS STYRENE RESIN COMPOSITION, AND LOW SURFACE GLOSS SHEET AND COMPOSITE ARTICLE THEREFROM

• US 20100075165A1
• Filed: 01/30/2008
• Published: 03/25/2010
• Est. Priority Date: 02/07/2007
• Status: Active Grant

• Current Assignee: LG Chem Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: Ahn, Tae-bin, Cho, Yun-kyoung, Ahn, Sung-tae, Lee, Bong-keun, Son, Seon-mo, You, Han-jong
• Granted Patent: US 8,378,024 B2
• Time in Patent Office: Days
• US Class Current: 428/519
• CPC Class Codes: B32B 25/14 comprising synthetic rubber copolymers B32B25/18 and B32B25/20 take precedence
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/30 comprising vinyl (co)polymers; comprising acrylic (co)polymers
• CPC Class Codes: C08J 2325/06 Polystyrene
• CPC Class Codes: C08L 2205/02 containing two or more polymers of the same C08L -group
• CPC Class Codes: C08L 2205/03 containing three or more polymers in a blend
• CPC Class Codes: C08L 2205/035 containing four or more polymers in a blend
• CPC Class Codes: C08L 25/06 Polystyrene
• CPC Class Codes: C08L 25/12 with unsaturated nitriles
• CPC Class Codes: C08L 2555/40 Mixtures based upon bitumen or asphalt containing functional additives
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 2666/04 Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
• CPC Class Codes: C08L 2666/06 Homopolymers or copolymers of unsaturated hydrocarbons; Derivatives thereof
• CPC Class Codes: C08L 35/06 Copolymers with vinyl aromatic monomers
• CPC Class Codes: C08L 51/04 grafted on to rubbers
• CPC Class Codes: Y10T 428/31924 Including polyene monomers

Abstract

The present invention relates to a low surface gloss styrene resin composition. The composition of the present invention is composed of (A) 80-99.9 weight % of the basic resin comprising rubber-modified styrene resin and (B) 0.1-20 weight % of syndiotactic polystyrene, the matting agent. The composition also includes (C) hydrogenated styrene block copolymer comprising styrene block and butadiene rubber block as a compatibilizer by 0.1-20 weight % for the total weight of the low surface gloss styrene resin composed of (A) the basic resin and (B) the matting agent and additionally includes (D) a plasticizer by 0.1-30 weight %. The composition of the present invention has excellent weatherability and impact-resistance in addition to the low surface gloss properties, so that it can be applied in various products, particularly exterior products for structures such as sidings and window frames, etc.

Claims

1. A low surface gloss styrene resin composition comprising:

(A) 80-99.9 weight % of a basic resin containing rubber-modified styrene polymer; and

(B) 0.1-20 weight % of a syndiotactic polystyrene as a matting agent.

2. The low surface gloss styrene resin composition according to claim 1, wherein the rubber-modified styrene polymer is prepared by copolymerization of styrene monomer and optionally, an unsaturated ethylene compound in the presence of rubber.

3. The low surface gloss styrene resin composition according to claim 2, wherein the rubber is one or more selected from the group consisting of polybutadiene, polyisoprene, styrene-butadiene copolymer, acrylonitrile-butadiene copolymer, alkyl acrylate rubber, ethylene-propylene rubber, ethylene-propylene-diene rubber and silicon rubber.

4. The low surface gloss styrene resin composition according to claim 2, wherein the rubber-modified styrene polymer contains a rubber by 5-30 weight %.

5. The low surface gloss styrene resin composition according to claim 2, wherein the styrene monomer is selected from the group consisting of styrene, α

-methylstyrene, o-methylstyrene, p-methylstyrene, m-methylstyrene, 1,3-dimethylstyrene and tert-butylstyrene.

6. The low surface gloss styrene resin composition according to claim 2, wherein the unsaturated ethylene compound is one or more compounds selected from the group consisting of acrylonitrile, methacrylonitrile, C₁-C₄ alkyl acrylate and alkyl methacrylate, acrylic acid, methacrylic acid, maleic anhydride, acrylamide and vinyl methyl ether.

7. The low surface gloss styrene resin composition according to claim 2, wherein the rubber-modified styrene polymer contains a rubber by 5-30 weight %, the styrene monomer by 40-90 weight % and the unsaturated ethylene compound by 5-30 weight %.

8. The low surface gloss styrene resin composition according to claim 1, wherein

(A) the basic resin additionally includes non-rubber modified styrene copolymer prepared by copolymerization of a styrene monomer and an unsaturated ethylene compound.

9. The low surface gloss styrene resin composition according to claim 8, wherein the non-rubber modified styrene copolymer contains the unsaturated ethylene compound by 20-80 weight %.

10. The low surface gloss styrene resin composition according to claim 8, wherein the non-rubber modified styrene copolymer is one or more selected from the group consisting of styrene-acrylonitrile copolymer, styrene-acrylonitrile-methylmethacrylate terpolymer, α

-methylstyrene-acrylonitrile copolymer, styrene-methylmethacrylate copolymer, styrene-maleic anhydride copolymer, α

-methylstyrene-styrene-acrylonitrile terpolymer, styrene-acrylonitrile-maleic anhydride terpolymer, styrene-acrylonitrile-acrylic acid terpolymer and α

-methylstyrene-styrene-acrylonitrile terpolymer.

11. The low surface gloss styrene resin composition according to claim 8, wherein the non-rubber modified styrene copolymer is a mixture of styrene-acrylonitrile copolymer and styrene-acrylonitrile-(meth)acrylate copolymer.

12. The low surface gloss styrene resin composition according to claim 11, wherein the styrene-acrylonitrile copolymer is prepared by copolymerization of 50-90 weight % of styrene copolymer and 10-50 weight % of acrylonitrile copolymer and has weight average molecular weight of 50,000-250,000, and the styrene-acrylonitrile-(meth)acrylate copolymer is prepared by copolymerization of 40-90 weight % of (meth)acrylate monomer, 15-40 weight % of styrene monomer and 3-20 weight % of acrylonitrile monomer.

13. The low surface gloss styrene resin composition according to claim 1, wherein the syndiotactic polystyrene has at least 85% tacticity in the case of dyad and at least 35% in the case of pentad (racemipentad).

14. The low surface gloss styrene resin composition according to claim 1, wherein the syndiotactic polystyrene contains carboxylic acid group on at least one of its terminals or is prepared by copolymerization of comonomer selected from the group consisting of maleic anhydride, maleic acid, fumaric acid and glycidyl-methacrylate with styrene monomer, and the content of the comonomer is 0.1-10 weight %.

15. The low surface gloss styrene resin composition according to claim 1, wherein the composition additionally includes (C) hydrogenated styrene block copolymer comprising styrene block and butadiene rubber block as a compatibilizer by 0.1-20 weight % for the total weight of the low surface gloss styrene resin composed of (A) the basic resin and (B) the matting agent.

16. The low surface gloss styrene resin composition according to claim 15, wherein the hydrogenated styrene block copolymer has the structure of styrene block-butadiene rubber block-styrene block and the butadiene rubber block herein is the rubber block prepared by copolymerization of butadiene and ethylene.

17. The low surface gloss styrene resin composition according to claim 15, wherein at least one of the blocks of the hydrogenated styrene block copolymer is formed by copolymerization of the monomer in the block and maleic anhydride, and the content of the maleic anhydride as a comonomer is 0.1-10 weight % for the weight of the block.

18. The low surface gloss styrene resin composition according to claim 1, wherein the composition additionally includes (D) a plasticizer by 0.1-30 weight % for the total weight of the low surface gloss styrene resin composed of (A) the basic resin and (B) the matting agent.

19. The low surface gloss styrene resin composition according to claim 18, wherein the plasticizer is one or more compounds selected from the group consisting of di-butyl-phthalate (DBP), di-2-ethylhexyl phthalate (DEHP or DOP), di-isononyl phthalate (DINP), di-isodecyl phthalate (DIDP) and butyl benzyl phthalate (BBP);

tri-ethylhexyl trimellitate (TEHTM or TOTM), tri-isononyl trimellitate (TINTM) and tri-isodecyl trimellitate (TIDTM);

tri-cresyl phosphate (TCP), tri-2-ethylhexyl phosphate (TEHP or TOP), cresyl diphenyl phosphate (CDP) and tri-aryl phosphate (TAP);

epoxidized soybean oil (ESO) and epoxidized linseed oil (ELO);

low polymerized polyester having average molecular weight of 1,000-8,000;

di-2-ethylhexyl adipate (DEHA or DOA), di-2-ethylhexyl azelate (DOZ) and di-isodecyl adipate (DIDA); and

chlorinated paraffin based plasticizer.

20. The low surface gloss styrene resin composition according to claim 1, wherein the composition additionally includes a glossless filler by 0.1-20 weight % for the total weight of the low surface gloss styrene resin composed of (A) the basic resin and (B) the matting agent.

21. The low surface gloss styrene resin composition according to claim 20, wherein the glossless filler is selected from the group consisting of a crosslinked SAN, a silicate based inorganic filler, glass beads, silica, glass flake, calcium carbonate and metaloxide.

22. The low surface gloss styrene resin composition according to claim 20, wherein the glossless filler is a crosslinked styrene-acrylonitrile copolymer.

23. The low surface gloss styrene resin composition according to claim 1, wherein the gloss of the composition is 1-50 at 75°

.

24. A sheet prepared by any one of the low surface gloss styrene resin compositions of claim 1.

25. A method for producing a sheet comprising the step of extruding one of the low surface gloss styrene resin compositions of claim 1 at the temperature of at least 80°

C. and at least 20°

C. lower than the melting point of the matting agent, syndiotactic polystyrene, by using an extruder.

26. The method for producing a sheet according to claim 25, wherein the sheet in the complex form is produced by co-extruding a thermoplastic resin composition and a low surface gloss styrene resin composition to prepare two sheets;

and pressing the two sheets to prepare a multilayer sheet.

27. The method for producing a sheet according to claim 26, wherein the thermoplastic resin is one or more resins selected from the group consisting of acrylonitrile-butadiene-styrene resins and polyvinylchloride resins.

28. A composite article containing an inside layer and an outside layer that covers at least one of the surfaces of the inside layer to prevent the inside layer from being exposed on external environment, wherein the inside layer is prepared by thermoplastic resin having less weatherability than the outside layer and the outside layer is formed by one of the low surface gloss styrene resin compositions of claim 1.

29. The composite article according to claim 28, wherein the thermoplastic resin of the inside layer is one or more resins selected from the group consisting of acrylonitrile-butadiene-styrene resins and polyvinylchloride resins.