Patent ID: 7605193

Claim:
An impact resistant modifier consisting of at least one multistage emulsion polymer of bonded units of: i) a core (C) of the following polymerized monomeric components: a) from 53 to 92.9% by weight of C 1 -C 8 -alkyl methacrylate, b) from 7 to 35% by weight of C 1 -C 8 -alkyl acrylate, c) from 0.1 to 2% by weight of at least one crosslinker, and d) from 1 to 5% by weight of one or more styrene derivatives; ii) a first shell (S1) of the following polymerized monomeric components: a) from 75 to 99.9% by weight of at least one C 1 -C 8 -alkyl acrylate, b) from 0 to 25% by weight of one or more styrene derivatives, and c) from 0.1 to 2% by weight of at least one crosslinker, and iii) a second shell (S2), of the following polymerized monomeric components: a) from 80 to 100.00% by weight of at least one C 1 -C 8 -alkyl methacrylate, b) from 0 to 20% by weight of at least one C 1 -C 8 -alkyl acrylate, and c) from 0 to 5% by weight of at least one regulator.