Process for preparing liquophilic polyamide membrane filter media and product

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 4340480
SERIAL NO

06198570

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A process is provided for preparing skinless liquophilic alcohol-insoluble polyamide membranes by preparing at a first temperature a solution in a polyamide solvent having a temperature coefficient of solubility within the range from about 0.01 to about 5 weight percent per degree Centigrade of an alcohol-insoluble polyamide resin having a ratio CH.sub.2 :NHCO of methylene CH.sub.2 to amide NHCO groups within the range from about 7:1 to about 12:1; inducing nucleation of the solution by controlled addition to the solution of a nonsolvent for the polyamide resin, under controlled conditions of concentration, temperature, addition rate, and degree of agitation to obtain a visible precipitate of polyamide resin particles which may or may not thereafter partially or completely redissolve, thereby forming a casting solution; spreading the casting solution on a substrate to form a thin film thereof on the substrate; cooling the film of casting solution to a second temperature sufficiently lower than the first temperature to precipitate polyamide resin from the casting solution; contacting and diluting the film of casting solution with a nonsolvent liquid, preferably containing a substantial proportion of the solvent liquid but less than the proportion in the casting solution, to precipitate polyamide resin from the casting solution in the form of a thin skinless liquophilic membrane; and washing and drying the resulting membrane.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
PALL CORPORATIONEAST HILLS, NY405

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Model, Frank Dix Hills, NY 1 99
Pall, David B Roslyn Estates, NY 51 2956

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Patent Info (Count) # Cites Year
 
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* Cited By Examiner