Molding compounds of(A) 5 to 95% by weight of a graft product of a mixture of 50 to 100 parts by weight styrene, .alpha.-methyl styrene, vinyl toluene, methyl methacrylate or mixtures thereof and 0 to 50 parts by weight acrylonitrile on a particulate silicone rubber with a mean particle diameter (d.sub.50) of from 0.10 to 0.50 .mu.m having a total rubber content of from 30 to 90% by weight and(B) 95 to 5% by weight of a graft product of a mixture of 50 to 100 parts by weight styrene, .alpha.-methyl styrene, vinyl toluene, methyl methacrylate or mixtures thereof and 0 to 50 parts by weight acrylonitrile on a particulate acrylate rubber with a mean particle diameter (d.sub.50) of from 0.05 to 1.00 .mu.m having a total rubber content of 30 to 80% by weight.