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US 4,544,677 AGranted
Foamable polycarbonate compositions, articles and methods
AssigneeGeneral Electric Company
InventorsRichard B. Allen, Roger W. Avakian
Life of this patent
Estimating the term…
Abstract
A foamable thermoplastic composition comprising in admixture (a) a polycarbonate resin, alone, or with (b) a polyester, (c) a minor amount of a foaming agent and (d) a minor amount of an inorganic non-fibrous particulate nucleating agent, alone, or with a particulate organic polymeric material, wherein (d) has an aspect ratio of about 1 and a small particle size.
Claims30
A foamable thermoplastic composition comprising
- (a) an aromatic polycarbonate, an aromatic polyester carbonate, an aromatic dihydric phenol sulfone carbonate, or a mixture of any of the foregoing, alone, or in combination with
- (b) a saturated polyester resin comprising units of an aliphatic diol, a cycloaliphatic diol, or a mixture of said diols and an aromatic diacid or a cycloaliphatic diacid,
- (c) a minor effective amount of a chemical foaming agent;
- and
- (d) a minor effective amount of siliceous particulate foam nucleating agent which is coated with a siliceous compound to render that agent hydrophobic, alone, or combined with a particulate organic polymeric material, said nucleating agent being substantially insoluble in the composition and having an aspect ratio of not greater than about 1.0, the amounts of (c) and (d) being sufficient to provide a rigid substantially uniform cellular core within a solid integral skin.
2 more elements
A foamable thermoplastic composition comprising
- (a) poly(bisphenol A carbonate);
- (c) from about 0.02 to about 2.0 parts by weight of a dihydrooxadiazinone foaming agent, and
- (d) from about 0.1 to 5.0 parts by weight of a particulate, synthetic, non-crystalline hydrophobic silica which is coated with a siliceous compound to render that silica hydrophobic, having an average particle diameter of less than about-10 microns, the parts by weight being based on 100 parts by weight total of (a), (c) and (d).
Dependencies are inferred from the claim text.