| abstract |
Polycarbonate homopolymers or copolymers comprising carbonate repeat units having the structure (I)n n n (I)n n n Wherein R 1 and R 2 are each independently C 1 -C 4 alkyl, n and p are each an integer of 1 to 4, and T is a C 5 -C 10 cyclo wherein one or two carbons are bonded to an aryl group Alkanes, C 1 -C 5 alkyl groups, C 6 -C 13 aryl groups, and C 7 -C 12 aryl alkyl groups; Strength enhancer, the strength enhancer comprising a first strength enhancer comprising a polycarbonate-polysiloxane copolymer and a second strength enhancer different from the first strength enhancer; And a flame retardant in combination. The compositions not only have good scratch resistance, but also have an improved balance of physical properties such as impact strength and spiral flow, while maintaining good flame retardant properties. |