Weatherable styrenic blends with improved translucency
AssigneeGeneral Electric Company
InventorsSatish Kumar Gaggar, Kwan Hongladarom
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Abstract
Rubber modified weatherable styrenic blends with improved transparency and colorability are disclosed. A matrix phase of poly(alkyl alkylacrylate) and vinyl carboxylic acid ester-vinyl aromatic-vinyl cyanide terpolymer is combined with a rubbery graft phase of a poly(alkyl acrylate) rubber substrate grafted with a vinyl aromatic-vinyl cyanide superstrate copolymer to provide acrylate-styrene-acrylonitrile type (ASA) compositions.
Claims18
An acrylate-styrene-acrylonitrile type (ASA) composition comprising:
- a) a matrix phase comprising (i) a terpolymer of a vinyl carboxylic acid ester monomer, a vinyl aromatic monomer and a vinyl cyanide monomer and (ii) a polymethylmethacrylate (PMMAV);
- and
- b) a graft copolymer comprising (i) a substrate rubber and (ii) a superstrate copolymer, wherein the substrate rubber comprises a rubber derived from a vinyl carboxylic acid ester monomer and wherein the superstrate copolymer comprises a copolymer derived from both
- vinyl aromatic monomer and a vinyl cyanide monomer,
- wherein the matrix phase is present at a weight percent level of from about 75 to about 25 weight percent of the total weight of the composition;
- and
- wherein the graft copolymer is present at a level of from about 25 to about 75 weight percent of the total weight of the composition, and the substrate rubber is present at a level of from about 5 to about 55 weight percent of the total weight of the composition.
An acrylate-styrene-acrylonitrile type composition comprising:
- a) a matrix phase comprising (A) a polymethylmethacrylate (PMMA), and (B) terpolymer derived from a vinyl carboxylic acid ester monomer, a vinyl aromatic monomer and a vinyl cyanide monomer, wherein the matrix composition of A:B is such that said composition has an opacity of less than about 91%;
- and
- b) a graft copolymer comprising a substrate rubber and a superstrate copolymer, wherein the substrate rubber comprises a rubber derived from a vinyl carboxylic acid ester monomer and the superstrate
- copolymer comprises a copolymer derived from both a vinyl aromatic monomer and a vinyl cyanide monomer;
- wherein the matrix phase is present at a weight percent level of from about 25 to about 75 percent by weight based on the total weight of the composition, and
- wherein the graft copolymer is present at a level of from about 25 to 75 weight percent of the total weight of the composition, and the substrate rubber is present at a level of from about 10 percent to about 40 weight percent of the total weight of the composition.
A method to improve the translucency of an acrylate-styrene-acrylonitrile type composition, said method comprising:
- a) blending about:
- (i) 25 to about 75 percent of a matrix phase comprising (A) a polymethylmethacrylate (PMMA), and (B) a terpolymer derived from a vinyl carboxylic acid ester monomer, a vinyl aromatic monomer and a vinyl cyanide monomer and (ii) about 25 to 75 weight percent of a graft copolymer comprising a substrate rubber and a superstrate copolymer, wherein the substrate rubber comprises a rubber derived from a vinyl carboxylic acid ester monomer and the superstrate copolymer comprises a copolymer derived from both a vinyl aromatic monomer and a vinyl cyanide monomer;
- and
- b) adjusting the ratio of A:B in said matrix phase such that said acrylate-styrene-acrylonitrile type composition has an opacity of less than about 91%.
Dependencies are inferred from the claim text.