Pall Corporation

Xuemei Liang

Richard A Morris

Binbing Han

Donald Simonton

Mark Murla

I-Fan Wang

Erik M Heidenreich

Hydrophilic porous membranes comprising a random copolymer of:   

Robust polymeric membrane

Asymmetric membranes comprising a first asymmetric porous zone including a first porous asymmetry that increases from the first exterior surface through the first porous zone of the bulk, and a second asymmetric porous zone including a second porous asymmetry that increases from the second exterior surface through the second porous zone of the bulk, wherein the first average pore size is larger than the second average pore size, as well as methods of making and using the membranes, are disclosed.

Asymmetric membranes

A microfiltration membrane comprising (a) an asymmetric layer, (b) an isometric layer, and (c) an interface layer between the asymmetric layer and the isometric layer, the interface layer having a first portion contacting the asymmetric layer and a second portion contacting the isometric layer; wherein, (i) the asymmetric layer has a region contacting the first portion of the interface layer, the region including cells having a first porous structure; (ii) the isometric layer has a region contacting the second portion of the interface layer, the region including cells having a second porous structure; the first porous structure being larger than the second porous structure; and the first portion of the interface layer comprises cells having the first porous structure, and the second portion of the interface layer comprises cells having the second porous structure, and methods of making and using the membrane, are disclosed. Also disclosed is a microfiltration membrane comprising (a) a first asymmetric layer, (b) a second asymmetric layer, and (c) an interface layer between the first asymmetric layer and the second asymmetric layer, the interface layer having a first portion contacting the first asymmetric layer and a second portion contacting the second asymmetric layer; wherein, (i) the first asymmetric layer has a region contacting the first portion of the interface layer, the region including cells having a first porous structure; (ii) the second asymmetric layer has a region contacting the second portion of the interface layer, the region including cells having a second porous structure; the first porous structure being larger than the second porous structure; and the first portion of the interface layer comprises cells having the first porous structure, and the second portion of the interface layer comprises cells having the second porous structure, as well as methods of making and using the membrane.

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Pensacola, FL, United States of America

Xuemei Liang