US 7,556,677 B2
	Solvent resistant asymmetric integrally skinned membranes
Richard Cranford, Cap-Rouge (Canada); and Christian Roy, Sillery (Canada)
Assigned to Vaperma Inc., Saint-Romuald (Canada)
Filed on Jan. 17, 2006, as Appl. No. 11/332,393.
Application 11/332393 is a continuation in part of application No. PCT/CA2004/001047, filed on Jul. 16, 2004.
Claims priority of application No. 2,435,538 (CA), filed on Jul. 18, 2003.
Prior Publication US 2006/0117955 A1, Jun. 08, 2006
Int. Cl. B01D 53/22 (2006.01)

U.S. Cl. 96—14  [96/8; 96/10; 96/12; 96/13; 95/45; 95/52; 95/54; 210/490; 210/640; 210/500.23; 210/500.28; 210/500.39; 264/5; 264/8; 264/347]

25 Claims

1. An asymmetric integrally skinned membrane comprising a polyimide and another polymer selected from the group consisting of polyvinylpyrrolidone, sulfonated polyetheretherketones and mixtures thereof, wherein said membrane is substantially insoluble in an organic solvent, and is substantially defect-free.