| abstract |
Polydiorganosiloxane-polycarbonate block copolymers based on dihydrodiphenylcycloalkanes corresponding to formula (I) ##STR1## in which R 1 , R 2 independently of one another represent hydrogen, halogen, preferably chlorine or bromine, C 1-8 alkyl, C 5-6 cycloalkyl, C 6-10 aryl and C 7-12 aralkyl, preferably phenyl-C 1-4 -alkyl, more especially benzyl, n n=2 or 3 and n the substituents R 5 independently of one another are hydrogen or C 1-12 alkyl, with the proviso that at least one of the substituents R 5 is not hydrogen, n having an average molecular weight M w (weight average) in the range from 10,000 to 300,000 (as measured by ultracentrifugation or scattered light measurement) and a content of carbonate containing dihydroxydiphenylcycloalkanes of formula I and, optionally, other diphenols in co-condensed form of from 75% by weight of 99.0% by weight and a content of polydiorganosiloxane having a degree of polymerization Pn of 5 to 300 of from 25% by weight of 1% by weight. |