Process for forming an expanded porous tetrafluoroethylene polym

Details Process for forming an expanded porous tetrafluoroethylene polym Process for forming an expanded porous tetrafluoroethylene polym

1990-12-17

1992-03-24

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Autogenously or by activation of dry coated particles

26417719, 2642106, 26421112, 2642888, 26433114, 425DIG55, B29C 4754, B29C 5518

Patent

active

050986252

ABSTRACT:
A process for preparing an improved expanded porous polytetrafluorethylene product having a higher density and improved cold flow properties and prepared from a paste formed from a polytetrafluoroethylene resin and a lubricant. The method includes extruding the paste through an extrusion die at a reduction ratio of less than 100, calendering the extrudate, removing the lubricant, and heating the extrudate to a temperature greater than the crystalline melting point of polytetrafluoroethylene but generally below the temperature at which thermal decomposition becomes appreciable while concurrently expanding the extrudate to at least twice its original length.

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patent: 2951047 (1960-08-01), Lantos
patent: 3260774 (1966-07-01), Harlow
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patent: 3664915 (1972-05-01), Gore
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patent: 4826725 (1989-05-01), Harlow
"Fluon Polytetrafluoroethylene", Technical Service Note F 12/13, ICI, 1981.
"Fluorocarbon Polymers", Polymer Technology, pp. 357-370.
"Fluon Polytetrafluoroethylene", Technical Service Note F10, 4th edition, ICI, 1985.

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