| abstract |
Graft copolymers obtained by (A) polymerizing 10 to 89 wt % of a mixture consisting essentially of either (a1) from 70 to 99.89 wt % of a C1-C18-alkyl ester of acrylic acid, (a2) from 0.1 to 10 wt % of a polyfunctional monomer, (a3) from 0 to 29.89 wt % of an ethylenically unsaturated monomer which differs from (a1) and (a2), is copolymerizable therewith and carries no acid group and (a4) from 0.01 to 10 wt % of a copolymerizable monomer containing at least one acid group or (a5) from 49.99 to 99.99 wt % of at least one diene, (a6) from 0 to 50 wt % of a monomer which is copolymerizable therewith and carries no acid group and (a7) from 0.01 to 10 wt % of a copolymerizable monomer containing at least one acid group in the presence of from 1 to 80 wt % of a cross-linked silicone rubber to form a copolymer A, and (B) polymerizing 10 to 89 wt % of a mixture consisting essentially of (b1) from 50 to 99.99 wt % of a styrene compound of the formula (I) <IMAGE> I where R1 and R2 independently of one another are each hydrogen, C1-C8-alkyl, etc. (b2) from 0 to 50 wt % of a methacrylonitrile, acrylonitrile, methacrylic acid, acrylic acid, maleic anhydride, etc. monomer and (b3) from 0.01 to 20 wt % of a copolymerizable monomer containing at least one basic group in the presence of the graft copolymer (A) and used to prepare thermoplastic molding materials. |