Foamable engineering thermoplastic compositions
AssigneeGeneral Electric Company
InventorRichard B. Allen
Life of this patent
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Abstract
A foamable composition comprises in admixture (a) a high molecular weight thermoplastic resin in particulate form and an effective amount of (b) a foaming agent therefor comprising a pumpable liquid dispersion comprising (i) a solid blowing agent, (ii) a liquid carrier, and, optionally, (iii) a thickener. The liquid dispersion can be pumped directly into the hopper of a foam molding machine eliminating the need to pre-mix pelletized concentrates of the solid blowing agent.
Claims10
A composition adapted for foam molding into an article having a rigid, substantially void-free, substantially uniform cellular core within a solid integral skin, said composition comprising a blend of
- (a) a high molecular weight resin in particulate form;
- and
- (b) a pumpable liquid dispersion of a foaming agent in an effective amount of from about 0.02 to about 5 parts by weight based on 100 parts of the total of (a) and (b), said dispersion comprising
- (i) a solid blowing agent;
- (ii) at least 10 parts by weight of a liquid carrier based on 100 parts by weight of liquid carrier and solid blowing agent combined;
- and, optionally,
- (iii) a thickener.
Dependencies are inferred from the claim text.