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US 4,288,561 AGranted
Foamable polyester composition
AssigneeGeneral Electric Company
InventorsDonald I. Craft, Morton Kramer
Life of this patent
Estimating the term…
Abstract
A foamable thermoplastic injection moldable composition comprising in admixture (a) a polyester resin, (b) a filler selected from the group consisting of fibrous glass or a mineral or mixtures thereof in an amount of from about 5 to about 50 weight percent and (c) a minor amount of a foaming agent. The compositions can also include flame retardant additives.
Claims18
A foamable thermoplastic injection moldable composition consisting of in admixture:
- (a) a poly(1,4-butylene terephthalate) resin or copolyesters thereof;
- (b) a filler selected from the group consisting of fibrous glass or a mineral or mixtures thereof in an amount of from about 5 to about 50 weight percent;
- and, (c) a foaming agent in amounts of from about 0.02 to about 5.0 weight percent based on the weight of the resin selected from the group consisting of dinitrosopentamethylene tetramine, p-toluene sulfonyl semicarbazide, 5-phenyltetrazole, calcium oxalate and trihydrazino-s-triazine.
A flame retardant foamable thermoplastic composition consisting of in admixture:
- (a) a poly(1,4-butylene terephthalate) resin or copolyester thereof;
- (b) a filler selected from the group consisting of fibrous glass or a mineral or mixtures thereof in an amount of from about 5 to about 50 weight percent;
- (c) a foaming agent in amounts of from about 0.02 to about 5.0 weight percent based on the weight of the resin selected from the group consisting of dinitrosopentamethylene tetramine, p-toluene sulfonyl semicarbazide, 5-phenyltetrazole, calcium oxalate and trihydrazino-s-triazine;
- and,
- (d) a flame retardant additive in a minor proportion but in an amount at least sufficient to render the polyester resin flame retardant, said flame retardant additive selected from the group consisting of (1) a low molecular weight polymer of a carbonate of a halogenated dihydric phenol, (2) a copolycarbonate of a halogen substituted dihydric phenol and a dihydric phenol, (3) a halogen-containing compound, (4) mixtures of either (1), (2) or (3) above with antimony oxide, (5) elemental phosphorus or a phosphorus compound, (6) a halogen-containing compound in admixture with a phosphorus compound, and (7) a compound containing phosphorus-nitrogen bonds.
2 more elements
Dependencies are inferred from the claim text.