Patent ID: 11884822
Assignee: SHPP GLOBAL TECHNOLOGIES B.V.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 0:
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.