Transparent blend compositions containing graft copolymers of (thioaromatic) alkylate rubber substrates

A composition consisting essentially of:

• (a) a thermoplastic polymer selected from the group consisting of polycarbonates, copolycarbonates, amorphous polyamides, and mixtures thereof, wherein the thermoplastic polymer has a refractive index greater than 1.55;
• and
• (b) a graft copolymer comprising a rubber substrate and a grafted portion, the rubber substrate being formed from a least one monomer of Formula I. ##STR5## wherein Z is an aromatic group, each R is individually selected from the group consisting of alkyl groups of from 1 to about 12 carbon atoms, thioalkyl groups of from 1 to about 12 carbon atoms, and halogen atoms, n is from 1 to about 6, and x is from 0 to 7, and optionally at least one monomer selected from the group consisting of butadiene and C.sub.3 -C.sub.8 alkyl acrylates, and the grafted portion being formed from at least one monomer selected from the group consisting of styrene, halogen-substituted styrene, alkyl-substituted styrene, and mixtures thereof;
• and wherein the rubber substrate has a glass transition temperature (Tg) of not greater than 0.degree. C. and a refractive index of greater than 1.55, and the graft portion has a refractive index of greater than 1.55;
• and
• wherein the refractive index differs between component (a) and component b) is not greater than about 0.025.