Patent ID: 8399560
Filing Date: 2013-03-19
Classification: C08L

Abstract:
1. A molding composition, comprising: a) at least 70% by weight of an impact modifier which comprises at least one polyalkyl(meth)acrylate phase capable of thermoplastic processing, b) at least 8% by weight of a polyalkyl(meth)acrylate bead polymer whose median particle size V c) from 0 to 42% by weight of a polyalkyl(meth)acrylate whose weight average molar mass is in the range from 20,000 to 350,000 g/mol, wherein a sum of the % by weight of components a) to c) is 100% by weight; wherein the impact modifier comprises a hard phase A) whose glass transition temperature Tg is >25° C. comprising at least 70% by weight of methyl methacrylate, and a tough phase B) obtained from monomers the polymers of which have a glass transition temperature Tg of <25° C., wherein the impact modifier is prepared by an at least two-stage polymerization process, wherein, in a first stage, said hard phase A) whose glass transition temperature Tg is >25° C. comprising at least 70% by weight of methyl methacrylate is polymerized to yield a hard phase A), and then, in a second stage, said monomers of the tough phase B), polymers of which have said glass transition temperature Tg of <25° C., are added to the polymerized hard phase A) and polymerized with the polymerized hard phase A).