CPC C08L 83/10 (2013.01) [C08G 64/1608 (2013.01); C08G 64/186 (2013.01); C08J 9/0061 (2013.01); C08L 67/02 (2013.01); C08L 69/00 (2013.01); C08L 69/005 (2013.01); C08J 2369/00 (2013.01); C08J 2383/10 (2013.01); C08J 2467/02 (2013.01); C08L 2203/14 (2013.01); C08L 2205/02 (2013.01)] | 16 Claims |
1. A foamed polycarbonate composition comprising
5 to 95 wt % of a poly(siloxane) block copolymer comprising
a poly(carbonate-siloxane) comprising 90 to 99 wt % of bisphenol A carbonate units and 1 to 10 wt % of dimethylsiloxane units, each based on the weight of the poly(carbonate-siloxane),
a poly(ester-carbonate-siloxane) comprising bisphenol A carbonate units, isophthalate-terephthalate-bisphenol A ester units, and 5 to 200 dimethyl siloxane units,
or a combination thereof;
5 to 95 wt % of an auxiliary component comprising
a poly(alkylene ester),
a poly(aliphatic ester-carbonate) comprising bisphenol A carbonate units and aliphatic ester units derived from a C8-12 aliphatic dicarboxylic acid and bisphenol A, wherein the poly(aliphatic ester-carbonate) has a weight average molecular weight from 15,000 to 45,000 grams/mole as measured via gel permeation chromatography using bisphenol A homopolycarbonate standards,
or a combination thereof, and
optionally, a homopolycarbonate;
optionally, up to 10 wt % of an additive composition comprising a flow modifier, an antioxidant, a heat stabilizer, a light stabilizer, an ultraviolet light stabilizer, an ultraviolet absorbing additive, a lubricant, a mold release agent, an antistatic agent, an anti-fog agent, an antimicrobial agent, a colorant, a surface effect additive, a radiation stabilizer, a flame retardant, an anti-drip agent, or a combination thereof,
wherein the siloxane content of the foamed composition is 0.001 to 3 wt %,
wherein the composition has a glass transition temperature of 140° C. and below measured using differential scanning calorimetry, and wherein the poly(siloxane) block copolymer, the auxiliary component, and the optional additive composition total 100 wt %, and wherein the polycarbonate composition does not comprise an impact modifier, a filler, or a reinforcing agent.
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