Low temperature foamable polycarbonate composition and articles thereof

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.