Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
2005-11-01
2005-11-01
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...
C525S326200, C264S405000, C264S464000, C264S472000, C264S486000
Reexamination Certificate
active
06960633
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
Irie Sadashige
Ohsaka Takako
Shenoy Suresh
Wynne Kenneth
Daikin Institute of Advanced Chemistry and Technology (Dai-Act)
Rabago Roberto
Virginia Commonwealth University
Whitman Curtis & Christofferson, PC
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