Process for producing porous polytetrafluoroethylene film

Details Process for producing porous polytetrafluoroethylene film Process for producing porous polytetrafluoroethylene film

1992-05-28

1993-06-08

Theisen, Mary Lynn

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Stratified or layered articles

264119, 264127, B29C 5502

Patent

active

052176665

ABSTRACT:
A porous PTFE film having a thin thickness and good permeability is produced by coating an emulsion of polytetrafluoroethylene on a substrate surface, in particular, a porous polytetrafluoroethylene substrate which has not been heated at a melting point of unsintered polytetrafluoroethylene or higher, heating the coated substrate at a temperature not lower than a melting point of sintered polytetrafluoroethylene to semi-sinter polytetrafluoroethylene, optionally removing the semi-sintered polytetrafluoroethylene film from the substrate, and then stretching the semi-sintered film at least in one direction.

REFERENCES:
patent: 4277429 (1981-07-01), Okita
patent: 4576861 (1986-03-01), Kato
patent: 4596837 (1986-06-01), Yamamoto et al.
patent: 4659528 (1987-04-01), Plowman et al.
patent: 5064593 (1991-11-01), Tamaru et al.
patent: 5071610 (1991-12-01), Hagen et al.

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