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US 7,611,629 B2Granted
UV treated membranes
AssigneePall Corporation
InventorsAbdoulaye Doucoure, Richard F. Salinaro, Yoshiki Mizuno
Life of this patent
Estimating the term…
Abstract
Non-coherent UV-treated porous halopolymer membranes are disclosed.
Claims26
A microporous PTFE membrane comprising:
- a first surface and a second surface and a thickness and bulk defined by the first and second surfaces, the microporous PTFE membrane modified by subjecting the microporous PTFE membrane to non-coherent broadband UV irradiation while pores of the membrane are impregnated with a liquid, the membrane having a critical wetting surface tension (CWST) of at least about 40 dynes/cm (0.40 erg/mm2) through the thickness and bulk of the microporous PTFE membrane, a wetting/dewetting ratio of at least about 0.7 for 2 or more cycles, and wherein the first and second surfaces each have a fluorine/carbon (F/C) ratio of about 1.5 or more and an oxygen/carbon (O/C) ratio in the range of from about 0.01 to about 0.15.
A microporous PTFE membrane comprising:
- a first surface and a second surface and a thickness defined by the first and second surfaces, the microporous PTFE membrane modified by subjecting the microporous PTFE membrane to non-coherent broadband UV irradiation while pores of the membrane are impregnated with a liquid, the membrane having a CWST of at least 26 dynes/cm (0.26 erg/mm2) through the thickness and bulk of the microporous PTFE membrane, and a wetting/dewetting ratio of at least about 0.7 for 2 or more cycles, wherein the microporous PTFE membrane is free of a coating and wherein the first and second surfaces each have a fluorine/carbon (F/C) ratio of about 1.5 or more and an oxygen/carbon (O/C) ratio in the range of from about 0.01 to about 0.15.
Dependencies are inferred from the claim text.