Process for preparing an asymmetrical macroporous membrane polymer
First Claim
1. A process for preparing an asymmetrical macroporous membrane, comprising the steps of:
- (A) forming a macroporous asymmetrical membrane from a polymer solution by action of a coagulating liquid, said polymer solution comprising as the dissolved fraction a polymeric mixture comprised of about 5-70% by weight of polyvinylpyrrolidone having a molecular weight of ≧
100,000 Dalton and about 95-30% by weight of a polymer selected from the group consisting of a polysulfone, a polyether sulfone, and an aromatic or araliphatic polyamide, said weight being relative to the total weight of the dissolved polymeric fraction, wherein coagulation is effected under conditions such that skin formation, asymmetrical pore formation and retention of said polyvinylpyrrolidone are achieved and(B) recovering the resultant asymmetrical macroporous membrane comprising said polymeric mixture.
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Abstract
A process for preparing an asymmetrical macroporous membrane from a polymer solution comprised as the dissolved portion fraction a polymeric mixture comprised of about 5-70% by weight of polyvinylpyrrolidone having a molecular weight of ≧100,000 Dalton and about 95-30% by weight of a polymer selected from the group consisting of polysulfone, a polyether sulfone, and an aromatic or araliphatic polyamide, said weight being relative to the total weight of the dissolved polymeric fraction, by action of a coagulating liquid, wherein the coagulation is effected under conditions such that skin formation, asymmetrical port formation and retention of the polyvinylpyrrolidone are achieved, recovering the asymmetrical macroporous membrane comprising the polymeric mixture.
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Citations
12 Claims
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1. A process for preparing an asymmetrical macroporous membrane, comprising the steps of:
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(A) forming a macroporous asymmetrical membrane from a polymer solution by action of a coagulating liquid, said polymer solution comprising as the dissolved fraction a polymeric mixture comprised of about 5-70% by weight of polyvinylpyrrolidone having a molecular weight of ≧
100,000 Dalton and about 95-30% by weight of a polymer selected from the group consisting of a polysulfone, a polyether sulfone, and an aromatic or araliphatic polyamide, said weight being relative to the total weight of the dissolved polymeric fraction, wherein coagulation is effected under conditions such that skin formation, asymmetrical pore formation and retention of said polyvinylpyrrolidone are achieved and(B) recovering the resultant asymmetrical macroporous membrane comprising said polymeric mixture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification