| abstract |
A polycarbonate-polydimethylsiloxane copolymer, the copolymer comprising a polycarbonate block of the formula <IMAGE> wherein R1 and R2 are hydrogen or a C1-C4 alkyl, R3 and R4 are hydrogen, halogen, a C1-C20 alkyl or an aryl, x is 1 to 5, y is to 4 and n is 1 to 100, and a polydimethylsiloxane block of the formula <IMAGE> wherein R5 and R6 are an organic residue having an aromatic nucleus and m is greater than or equal to 100, the copolymer having a content of the polydimethylsiloxane block of 0.5 to 10% by weight, an n-hexane soluble matter content in an amount of 1.0% by weight or less and a viscosity average molecular weight of 10,000-50,000. The copolymer has a high impact resistance and when blended with a glass fiber or a carbon fiber forms a molded product having an extremely high Izod impact strength. |