Patent ID: 6657018
Filing Date: 2003-12-02
Classification: C08G,C08K

Abstract:
Polysiloxane-polycarbonate block copolymers, which comprise:(1) polycarbonate blocks with recurring units of the formula: where R3 and R4 are each independently selected from hydrogen, hydrocarbyl or halogen-substituted hydrocarbyl; and(2) interrupting polysiloxane blocks of the formula: where R1 and R2 are each independently selected from hydrogen, hydrocarbyl or halogen-substituted hydrocarbyl, D is an integer of from about 10 to about 120, and Y is selected from hydrogen, hydrocarbyl, hydrocarbyloxy and halogen; andwherein the weight percentage of said polycarbonate blocks (1) is from about 92 to about 96%, and the weight percentage of siloxane from said polysiloxane blocks (2) is from about 4 to 8%.