Fluoropolymer-carbon dioxide compositions and methods of...

Details Fluoropolymer-carbon dioxide compositions and methods of... Fluoropolymer-carbon dioxide compositions and methods of...

2006-10-03

2006-10-03

Rabago, Roberto (Department: 1713)

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S331400, C525S330700, C525S383000

Reexamination Certificate

active

07115685

ABSTRACT:
Fluoropolymer materials containing tetrafluoroethylene monomers, such as PTFE, are significantly swollen by supercritical carbon dioxide at high temperatures and pressures. The swollen fluoropolymer is processable by molding, extrusion, and other techniques. In addition, the fluoropolymer may be sintered at significantly lower temperatures compared to a nonswollen fluoropolymer material. The melting temperature of fluorinated polymers containing tetrafluoroethylene and triflouroethylene monomers which are swollen with supercritical carbon dioxide is significantly reduced, thereby permitting manufacturing operations such as extruding and molding to be performed at lower temperatures and with reduced risk of decomposition.

REFERENCES:
patent: 5821273 (1998-10-01), Venkataraman et al.
patent: 5912278 (1999-06-01), Venkataraman et al.
International Standard ISO12086-1, First Edition, 1995, p. 1.

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