Method of forming foamed fluoropolymer composites

Details Method of forming foamed fluoropolymer composites Method of forming foamed fluoropolymer composites

1997-05-07

1999-03-23

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 464, 264 466, 264 469, 264 50, 156 79, B29C 4406, B29C 4412

Patent

active

058854940

ABSTRACT:
Fluoropolymer is advantageously foamed by first forming a composite structure of a layer of the fluoropolymer to be foamed and a layer of different material such as a different fluoropolymer not to be foamed, followed by heating the composite structure to the foamable state for the layer of fluoropolymer to be foamed, pressurizing the heated composite structure with supercritical carbon dioxide, rapidly depressurizing the heated composite structure, whereby the foamable layer foams and the other layer foams less or not at all, and cooling the foamed composite structure.

REFERENCES:
patent: 4711811 (1987-12-01), Randa
patent: 4716073 (1987-12-01), Randa
patent: 4764538 (1988-08-01), Buckmaster et al.
patent: 5023279 (1991-06-01), Buckmaster et al.
patent: 5227103 (1993-07-01), Muschiatti
patent: 5514759 (1996-05-01), De Simone et al.
patent: 5530049 (1996-06-01), Dee et al.

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