Hydrophilic semi-permeable PTFE membranes and their manufacture

Details Hydrophilic semi-permeable PTFE membranes and their manufacture Hydrophilic semi-permeable PTFE membranes and their manufacture

1990-07-10

1991-08-20

Sever, Frank

Liquid purification or separation

Filter

Material

55158, 264 48, B01D 7126

Patent

active

050412256

ABSTRACT:
A hydrophilic, semipermeable membrane comprises a microporous PTFE membrane having the internal and external surfaces of the membrane structure coated by a complex formed by the combination of a hydrophilic polymer which adheres to the membrane structure and a complexing agent, the complex rendering the microporous PTFE membrane substantially hydrophilic and protein affinitive. The preferred hydrophilic polymariz/polyvinyl alcohol, and the complexing agent is preferably a dibasic inorganic acid, such as boric acid, or a salt thereof. Such hydrophilic, semipermeable membranes are particularly suitable for protecting the target area of a body fluid diagnostic test strip, and a cell culture support members. Methods of forming the membranes are also described.

REFERENCES:
patent: 4318714 (1982-03-01), Kimura et al.

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