Process for producing polytetrafluoroethylene porous films

Details Process for producing polytetrafluoroethylene porous films Process for producing polytetrafluoroethylene porous films

1985-07-03

1987-11-17

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Autogenously or by activation of dry coated particles

264154, 264159, 264237, 2642888, 2642902, 264348, B29C 6720, B29C 5512

Patent

active

047073144

ABSTRACT:
A process for producing a polytetrafluoroethylene porous film having excellent mechanical strength wherein pores have a substantially perfect circle and it is possible to uniformly control its pore size to a predetermined size. The porous film is obtained by compression molding polytetrafluoroethylene resin molding powders obtained by a suspension polymerization method to prepare a preform, sintering said preform at a temperature of at least 327.degree. C., forming it into a film, resintering the film at a temperature of at least 327.degree. C., quenching it at a cooling rate of at least 70.degree. C. per hour to reduce the crystallinity of polytetrafluoroethylene to 55% or below, and thereafter stretching said film at a stretch ratio of from 1.3 to 6.5 while heating it to a temperature of from 100.degree. to 320.degree. C.

REFERENCES:
patent: 4478898 (1984-10-01), Kato

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