UV-stabilized polycarbonate mouldings

Claim 1

A UV-stabilised polycarbonate moulding with a thickness of 0.01 mm to 1.2 mm, made of a thermoplastic polydiorganosiloxane/polycarbonate block copolymer with a mean weight-average molecular weight (Mw) of 10,000 to 200,000, consisting of (A) 85% by weight to 99.5% by weight, based on (A)+(B), of aromatic carbonate structural units of the general formula ##STR6## in which --O--D--O-- is a diphenate radical, (B) 15% by weight to 0.5% by weight, based on (A)+(B), of polydiorganisiloxane structural units of the general formula ##STR7## in which radicals R are identical or different and denote a linear C 1 -C 20 -alkyl, branched C 3 -C 20 -alkyl, halogenated linear C 1 -C 20 -alkyl, halogenated branched C 3 -C 20 -alkyl, C 6 -C 20 -aryl or halogenated C 6 -C 20 -aryl radical, n is an integer between 5 and 100 and --O--D--O-- has the foregoing meaning for its part of the structural unit of formula (I), and (C) structural units of chain stoppers and, if desired, branching agents, in which the block copolymer contains a UV absorber said UV absorber being concentrated on its surface.