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US 4,707,265 AGranted
Reinforced microporous membrane
AssigneeCuno Incorporated
InventorsRobert G. Barnes, Jr., Mark T. Meyering
Life of this patent
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Abstract
A reinforced laminated filtration membrane is provided. The membrane comprises: (a) a porous reinforcing web impregnated with a polymeric microporous inner membrane; and (b) at least one polymeric microporous outer membrane laminated to each side of the impregnated web, wherein the pore size of the inner membrane is greater than the pore size of the outer membranes. Preferably, the polymeric membranes are nylon.
Claims8
A process for the filtration of liquids having particulate contaminants therein, comprising passing the liquid through a microporous reinforced laminated filtration membrane comprising:
- (a) a porous reinforcing web impregnated with a polymeric substantially isotropic microporous inner membrane,
- (b) at least one polymeric substantially isotropic microporous outer membrane laminated to each side of the impregnated web, each of said outer membranes having a pore size of at least about 0.05 microns,
- wherein the ratio of the pore size of the inner membrane to the outer membranes is from about 1.5:1 to about 6:1,
- whereby the particular contaminants are retained on the reinforced laminated filtration membrane.
1 more element
Dependencies are inferred from the claim text.