US 11,884,822 B2
Low temperature foamable polycarbonate composition and articles thereof
Bart Vandormael, Bergen op Zoom (NL); Arno C. Hagenaars, Bergen op Zoom (NL); Johannes Gerardus Petrus Goossens, Bergen op Zoom (NL); Johannes De Brouwer, Bergen op Zoom (NL); and Pieter Jan Antoon Janssen, Bergen op Zoom (NL)
Assigned to SHPP GLOBAL TECHNOLOGIES B.V., Bergen op Zoom (NL)
Filed by SHPP Global Technologies B.V., Bergen op Zoom (NL)
Filed on Aug. 31, 2020, as Appl. No. 17/007,644.
Claims priority of application No. 19200434 (EP), filed on Sep. 30, 2019.
Prior Publication US 2021/0095127 A1, Apr. 1, 2021
Int. Cl. C08J 9/00 (2006.01); C08L 69/00 (2006.01); C08L 67/02 (2006.01); C08L 83/10 (2006.01); C08G 64/16 (2006.01); C08G 64/18 (2006.01)
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.