Microporous asymmetric polyamide membranes

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United States of America Patent

PATENT NO 4770777
SERIAL NO

07008227

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Abstract

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Integral gradient, skinned, submicroscopically porous, anisotropic, hydrophilic, asymmetric polyamide membranes comprising: (a) a first porous polyamide zone obtained from a polyamide solution formulated to give coagulated film with pores of a given size, (b) a fabric support imbedded in the first porous polyamide layer, and (c) a second porous polyamide zone having a skinned outer surface, obtained from a polyamide solution having the same constituents as the solution used to form the first porous polyamide zone but solution post-treated to give pores substantially smaller than those in the first porous polyamide zone, as well as a process for producing such membranes, are disclosed.

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Patent Owner(s)

Patent OwnerAddress
PARKER INTANGIBLES INC A CORP OF DE1409 FOULK RD STE 102 WILMINGTON DE 18903

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Laccetti, Anthony J Shelton, CT 16 200
Steadly, Harvey Westport, CT 1 53

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