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US 5,348,985 AGranted
Process for making thermoplastic polyester foams
AssigneeGeneral Electric Company
InventorsEric J. Pearce, John W. Carbone
Life of this patent
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Abstract
A process for making thermoplastic polyester foams comprises the steps of subjecting macrocyclic polyester oligomer precursors to initiators and blowing agents at a constant operating temperature in order to produce foams which unexpectedly display low foam densities.
Claims14
A process for making thermoplastic polyester foam comprising the steps of:
- (a) heating to an operating temperature macrocyclic polyester oligomer precursors to produce free flowing precursors;
- (b) subjecting said free flowing precursors to a blowing agent and an initiator;
- and
- (c) recovering said thermoplastic polyester foam.
1 more element
Dependencies are inferred from the claim text.