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Method of forming foamed fluoropolymer composites

  • US 5,885,494 A
  • Filed: 05/07/1997
  • Issued: 03/23/1999
  • Est. Priority Date: 05/22/1996
  • Status: Expired due to Term
First Claim
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1. Process for foaming a composite structure comprising a layer of first fluoropolymer and a substrate in contact with said layer, said layer of first fluoropolymer being solid, said first fluoropolymer being foamable at a temperature at which said substrate is either less foamable or is non-foamable, said process comprising(a) heating said composite structure in which said layer of first fluoropolymer is solid to a foamable state for said first fluoropolymer,(b) pressurizing the heated composite structure with supercritical CO2,(c) depressurizing the pressurized heated composite structure while said first fluoropolymer is still in the foamable state, whereby said CO2 foams said layer of said first fluoropolymer, and(d) cooling said foamed composite structure.

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