Flame Retardant and Scratch Resistant Thermoplastic Polycarbonate Compositions

摘要

A thermoplastic composition comprising in combination a polycarbonate homopolymer or copolymer comprising repeat carbonate units having the following structure: wherein R₁ and R₂ are independently at each occurrence a C₁-C₄ alkyl, n and p are each an integer having a value of 1 to 4, and T is selected from the group consisting of C₅-C₁₀ cycloalkanes attached to the aryl groups at one or two carbons, C₁-C₅ alkyl groups, C₆-C₁₃ aryl groups, and C₇-C₁₂ aryl alkyl groups; an impact modifier, wherein the impact modifier comprises a first impact modifier comprising a polycarbonate-polysiloxane copolymer and a second impact modifier different from the first impact modifier; and a flame retardant is disclosed. The compositions have excellent scratch resistance as well as an improved balance of physical properties such as impact strength and spiral flow, while at the same time maintaining their good flame performance.