Asymmetric micro-porous membrane containing a layer of minimum s

Details Asymmetric micro-porous membrane containing a layer of minimum s Asymmetric micro-porous membrane containing a layer of minimum s

1986-07-28

1990-06-12

Spear, Frank

Liquid purification or separation

Filter

Supported, shaped or superimposed formed mediums

21050041, 364 41, B01D 1300

Patent

active

049330810

ABSTRACT:
A new micro-porous membrane having a layer of minimum pores inside is disclosed. This membrane can be produced by a kind of dry-wet method in which a gas is in contact with the surface of the spread solution before it is immersed in a solidifying bath to form a coacervation phase only in the surface layer of the spread solution. It is quite important to control the amount of non-solvent for a utilized polymer contained in the gas as well as a blowing rate of the gas toward the above mentioned surface. The micro-porous membrane of the present invention not only has an improved filtration flow rate and life as a filter, but also the risk of being damaged by scratches is minimized.

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patent: 4388189 (1983-06-01), Kawaguchi et al.
patent: 4450126 (1984-05-01), Kesting
patent: 4547289 (1985-10-01), Okano et al.

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