Thermoplatic molding materials

A thermoplastic molding material consisting essentially of high-impact polystyrene containing (A) from 75 to 97% by weight of polystyrene as a hard matrix, and (B) from 3 to 25% by weight of particulate, elastomeric (co)polymer based essentially on butadiene or its copolymers and having a glass transition temperature of less than -20.degree. C., in turn consisting of, based on B

• B1:
• from 40 to 98% by weight of a (co)polymer B1having a means particle size of from 100 to 600 nm and
• B2:
• from 2 to 60% by weight of a particle blend B2 which in turn consists of, based on B2,
• B21 from to 1 to 60% by weight of a (co)polymer B21 having a mean particle size of from 200 to 1200 nm and
• B22 from 40 to 99% by weight of a (co)copolymer B22 having a means particle size of from 1200 to 8000 nm,
• (co)polymer B1 having an encapsulated-particle morphology and (co)polymers B21 and B22 having a cellular and/or coiled particle morphology.