Patent ID: 6534592
Filing Date: 2003-03-18
Classification: B29C,C08F,C08L

Abstract:
A capstock composition for providing reduced gloss capstock materials, said composition comprising:(A) from 70 to 99 parts by weight of a first core/shell polymer comprising (i) from 30 to 70 parts by weight of a core polymer comprising (a) from 45 to 99.9 parts by weight of units derived from at least one C1-C8 alkyl acrylate monomer, (b) from 0 to 50 parts by weight of units derived from at least one ethylenically unsaturated copolymerizable monomer different from the at least one C1-C8 alkyl acrylate monomer, and (c) from 0.1 to 5 parts by weight of units derived from at least one crosslinker or graftlinker, and (ii) from 30 to 70 parts by weight of a shell polymer grafted to the core polymer (A)(i) comprising (a) from 80 to 99 parts by weight of units derived from at least one C1-C8 alkyl methacrylate monomer, and (b) from 1 to 20 parts by weight of units derived from at least one ethylenically unsaturated copolymerizable monomer different from the at least one C1-C8 alkyl metbacrylate monomer; and (B) from 1 to 30 parts by weight of a second core/shell polymer comprising (i) from 70 to 92 parts by weight of a core polymer comprising (a) from 50 to 99.9 parts by weight of units derived from at least one C1-C8 alkyl acrylate monomer, (b) from 0 to 45 parts by weight of units derived from at least one ethylenically unsaturated copolymerizable monomer different from the at least one C1-C8 alkyl acrylate monomer, and (c) from 0.1 to 5 parts by weight of units derived from at least one crosslinker or graftlinker; and (ii) from 8 to 30 parts by weight of a shell polymer comprising (a) from 50 to 100 parts by weight of units derived from at least one C1-C8 alkyl methacrylate monomer, and (b) from 0 to 50 parts by weight of units derived from at least one ethylenically unsaturated copolymerizable monomer different from the at least one C1-C8 alkyl methacrylate monomer, â€ƒwherein the second core/shell polymer has a shell weight average molecular weight in the range of from 25,000 to 350,000 g/mol.