Integral microporous high void volume polycarbonate membranes and a dry process for forming same
AssigneeChemical Systems, Inc.
InventorRobert E. Kesting
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Abstract
Integral, skinned and unskinned, microporous microfiltration and ultrafiltration, electrophoresis membranes having high void volumes (above 50% void) composed of polycarbonates and copolymers of polycarbonates with polyalkylene oxides and the dry process for producing such membranes are disclosed.
Claims23
As an article of manufacture, integral, high void volume polycarbonate resin membrane prepared by the dry phase inversion process being composed of polycarbonate polymer or polycarbonate-polyalkylene oxide copolymer having a molecular weight greater than about 46,000 (.eta. = 75), and having a void volume above 65%.
Integral, microporous membranes having a void volume above 50% consisting essentially of polycarbonate resin having the structure ##EQU10## or the structure ##EQU11## wherein :
- n is an integer greater than about 180, x is an integer from about 180 to about 600, y is an integer from about 1 to about 6, z is an integer from about 13 to about 450, R is a radical selected from the group consisting of H--, (CH.sub.3).sub.2 CH--, and ##SPC7##
- R' is a radical selected from the group consisting of ##SPC8##
- and ##EQU12## and substituted derivatives thereof, and wherein R" is a radical selected from the group consisting of ##EQU13## and ##EQU14## wherein a and b are integers ranging from about 3 to about 10 and c is an integer ranging from about 20 to about 50.
Dependencies are inferred from the claim text.