Composition based on copolycarbonates

A copolycarbonate composition containing

• A) 2 to 98 parts by weight of a thermoplastic aromatic copolycarbonate built up from 34 to 26 mole % of monomers of formula (I)
• wherein
• R1 to R8 independently of one another denote hydrogen, halogen, C1 to C8 alkyl, C1 to C5 cycloalkyl, C6 to C10 aryl and C7 to C12 aralkyl, and complementary amounts of monomers of formula (II)
• wherein
• A denotes C1-C5 alkylene, C2-C5 alkylidene, C5-C6 cycloalkylidene, —O—, —SO—, —CO—, —S—, —SO2—, C6-C12 arylene onto which further aromatic rings optionally containing heteroatoms may be condensed, or a radical of the formula (IIa) or (IIb)
• B in each case denotes C1-C12 alkyl or halogen,
• x in each case independently of one another is 0, 1 or 2,
• p is 1 or 0, and
• R5 and R6, which may be chosen individually for each X1, independently of one another denote hydrogen or C1-C6 alkyl,
• X1 denotes carbon, and
• m is an integer from 4 to 7, with the proviso that at least one atom is X1 and R5 and R6 are simultaneously alkyl, and
• B) 1 to 50 parts by weight of at least one graft polymer of
• B1) 5 to 90 parts by weight of at least one vinyl monomer and
• B2) 95 to 10 parts by weight of a rubber having a glass transition temperature of ≦10° C.