Glass fiber-reinforced polycarbonate molding compositions having

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...

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524261, 524267, 524493, 524537, 525432, 525464, 523434, 523437, C08K 340

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057287651

ABSTRACT:
The invention is based on the surprising and unexpected finding that the impact performance of a thermoplastic composition containing aromatic polycarbonate resin and glass fibers is improved upon incorporation therewith of a particular silicone rubber powder. The silicone rubber powder, added at a level of about 0.5 to 4 percent, relative to the weight of the composition, is characterized in that it contains a mixture of (a) a polydiorganosiloxane and (b) silica, said glass fibers being of the type which do not, per se, adhere to the polycarbonate matrix in which they are incorporated.

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R. Buch et al, "Silicone-Base Additives for Thermoplastic Resin Providing improved Impact Strength Processing and Fire Retardant Synergy", (Dow Corning Corp.) Fire Retardant Chem Assoc., Oct. 26-29, 1993.

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