Flame retardant polycarbonate compositions, methods of manufacture thereof and articles comprising the same
OwnerYun Zheng, Yunan Cheng +1inventors
InventorsYun Zheng, Yunan Cheng, Shijie Song
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Abstract
Disclosed herein is a flame retardant composition comprising a polycarbonate; 5 to 10 weight percent of a polysiloxane-polycarbonate copolymer; where the polysiloxane-polycarbonate copolymer comprises an amount of greater than 10 weigh percent of the polysiloxane and where the molecular weight of the polysiloxane-polycarbonate copolymer is greater than or equal to 25,000 grams per mole; 5 to 20 weight percent of a branched polycarbonate; 5 to 60 weight percent of a reinforcing filler; and 1 to 15 weight percent of a flame retarding compound
Claims25
A flame retardant composition comprising:
- a polycarbonate;
- 5 to 10 weight percent of a polysiloxane-polycarbonate copolymer;
- where the polysiloxane-polycarbonate copolymer comprises an amount of greater than 10 weigh percent of the polysiloxane and where the molecular weight of the polysiloxane-polycarbonate copolymer is greater than or equal to 25,000 grams per mole;
- 5 to 20 weight percent of a branched polycarbonate;
- 5 to 60 weight percent of a reinforcing filler;
- and
- 1 to 15 weight percent of a flame retardant compound;
- where all weight percents are based on the total weight of the flame retardant composition;
- where the flame retardant composition displays a notched Izod impact strength of 90 to 300 Joules per meter when measured as per ASTM D256.
A method comprising:
- blending a polycarbonate;
- 5 to 10 weight percent of a polysiloxane-polycarbonate copolymer;
- 5 to 20 weight percent of a branched polycarbonate;
- 5 to 60 weight percent of a reinforcing filler;
- where the reinforcing filler is a glass fiber, a carbon fiber, a metal fiber, or a combination comprising at least one of the foregoing reinforcing fillers;
- and 1 to 15 weight percent of a flame retardant compound to form a flame retardant composition;
- and
- extruding the flame retardant composition.
Dependencies are inferred from the claim text.