Porpous PTFE film and a manufacturing method therefor

Details Porpous PTFE film and a manufacturing method therefor Porpous PTFE film and a manufacturing method therefor

1995-03-10

1995-12-19

Spear, Frank

Liquid purification or separation

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210507, B01D 7136

Patent

active

054765897

ABSTRACT:
A nonwoven web is described that is a thin porous polytetrafluoroethylene membrane consisting essentially of a nonwoven web having a microstructure of substantially only microfibrils fused at crossover points. It is usually strong, is unusually thin, has unusually small pore sizes, but a very high air flow-through. It has a pore size between 0.05 and 0.4 micrometers; a bubble point between 10 and 60 psi; a pore size distribution value between 1.05 and 1.20; a ball burst strength between 0.9 and 17 pounds/force; an air flow of between 20 Frazier and 10 Gurley seconds; a thickness between 1.0-25.4 micrometer; and a fiber diameter ranging between 5 and 200 nm.

REFERENCES:
patent: 4645602 (1987-02-01), Barnes, Jr. et al.
patent: 4902423 (1990-02-01), Bacino
patent: 5234739 (1993-08-01), Tanaru et al.

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