Process for preparation of improved semipermeable composite memb

Details Process for preparation of improved semipermeable composite memb Process for preparation of improved semipermeable composite memb

1980-12-24

1983-06-14

Spear, Jr., Frank A.

Liquid purification or separation

Filter

Supported, shaped or superimposed formed mediums

2105002, 427245, B01D 3100

Patent

active

043881890

ABSTRACT:
In a process for producing a semipermeable composite membrane which comprises forming on a microporous substrate a thin layer of a polymeric material comprising a polyamino polymer containing at least 1 milliequivalent, per gram of the polymer in the dry state, of active amino groups selected from primary amino groups and secondary amino groups, and thereafter interfacially crosslinking a surface portion of said thin layer with a crosslinking agent having at least two functional groups (a) capable of easily reacting with either the primary or secondary amino groups or both in said polymer; the improvement wherein

REFERENCES:
patent: 3133132 (1964-05-01), Loeb et al.
patent: 3133137 (1964-05-01), Loeb et al.
patent: 3567632 (1971-03-01), Richter et al.
patent: 3951815 (1976-04-01), Wrasidlo
patent: 4005012 (1977-01-01), Wrasidlo
patent: 4039440 (1977-08-01), Cadotte
patent: 4265745 (1981-05-01), Kawaguchi et al.

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