Alcohol-insoluble nylon microporous membranes
First Claim
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1. A hydrophilic alcohol-insoluble polyamide microporous membrane containing crosslinked amide groups of the structure:
- ##STR6## wherein d is an integer of about 1 to 3.
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Abstract
Alcohol-insoluble polyamide (nylon) microporous separation membranes are prepared from alcohol-soluble polyamide (nylon) polymers. The membranes are hydrophilic and contain crosslinked amide groups of the structure: ##STR1## wherein d is an integer of about 1 to 3.
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25 Claims
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1. A hydrophilic alcohol-insoluble polyamide microporous membrane containing crosslinked amide groups of the structure:
- ##STR6## wherein d is an integer of about 1 to 3.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 19, 20, 21)
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13. A process of preparing an alcohol-insoluble microporous polyamide membrane which comprises the steps of (i) dissolving in a solvent an alcohol soluble polyamide resin in which about 10 to 50% of the amide groups are substituted with alkoxyalkyl groups of the formula (CH2)d --O--R wherein d is an integer of about 1 to 3, and R is hydrogen or an alkyl group having about 1 to 4 carbon atoms;
- (ii) acidifying the resin solution to controllably partially crosslink the resin;
(iii) casting the acidified solution into a casting bath which is a nonsolvent for the crosslinked resin to form the microporous membrane;
(iv) rinsing the resulting membrane; and
(v) drying the resulting membrane. - View Dependent Claims (14, 15, 16, 17, 18, 22, 23, 24, 25)
- (ii) acidifying the resin solution to controllably partially crosslink the resin;
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