Fluoropolymer foams, process to make them and applications...

Details Fluoropolymer foams, process to make them and applications... Fluoropolymer foams, process to make them and applications...

2005-04-28

2010-11-30

Zimmer, Marc S (Department: 1765)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

C521S090000, C521S094000, C521S097000, C521S145000

Reexamination Certificate

active

07842735

ABSTRACT:
Described is a process for making closed cell fluoropolymer foam, and the foam so made. The process includes subjecting a fluoropolymer resin an inert gas at a pressure higher than atmospheric to drive gas into the resin, raising the temperature of the resin to or above its softening point, and reducing the pressure while maintaining the temperature at or above the softening point of the resin, in order to expand the resin to result in closed cell fluoropolymer foam. The resin is cross-linked prior to expansion. The resulting foams can be used in various applications, such as in flotation devices and for making thermal and/or acoustic insulation.

REFERENCES:
patent: 3819796 (1974-06-01), Webster et al.
patent: 4737526 (1988-04-01), Mukaiyama et al.
patent: 4764538 (1988-08-01), Buckmaster et al.
patent: 5885494 (1999-03-01), Venkataraman et al.
patent: 5922493 (1999-07-01), Humphrey et al.
patent: 6949588 (2005-09-01), Park
patent: 2003/0233792 (2003-12-01), Kramer
abstract for JP 9-302134 A (Nov. 1997).

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