| abstract |
(57) [Summary] (Modified) [Objective] Improved low temperature stretchability, improved impact strength of thick parts, improved crack resistance during thermal cycling, Thermoplastic composition showing improved impact retention. The polysiloxane segment of the copolymer is of formula I A thermoplastic composition comprising a siloxane polycarbonate block copolymer of formula IA or formula IIB and a high temperature resistant polycarbonate containing repeating units of formula III. [Wherein A is a divalent hydrocarbon group containing 1 to about 15 carbon atoms, R 1 and R 2 are hydrogen, hydrocarbyl, etc., A ′ is an alkylene having 2 to 12 carbon atoms, D is an integer from about 10 to about 120, Y is hydrogen, Hydrocarbyl, etc., E is an integer from about 1 to about 10, X is hydrogen, halogen, etc., Z is —O—, —N (R 3 ). - or mixtures thereof, R 3 is hydrogen, is selected from hydrocarbyl and halogen-substituted hydrocarbyl] |