Composite semipermeable membrane

Details Composite semipermeable membrane Composite semipermeable membrane

1981-07-28

1986-10-28

Spear, Frank

Liquid purification or separation

Filter

Supported, shaped or superimposed formed mediums

21050042, B01D 1300

Patent

active

046197672

ABSTRACT:
A composite semipermeable membrane is described, wherein said membrane comprises (1) a porous substrate, (2) an ultrathin film as a surface layer formed by polymerization by crosslinking of polyvinyl alcohol and an amino compound having at least two secondary amino groups using a polyfunctional crosslinking reagent capable of reacting with secondary amino groups and hydroxyl groups, and (3) a porous inner layer composed of water insoluble polyvinyl alcohol which is present between the porous substrate and the ultrathin film.

REFERENCES:
patent: 3951815 (1976-04-01), Wrasidlo
patent: 4337154 (1982-06-01), Fukuchi et al.

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