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US 6,887,408 B2Granted
Porous poly(aryl ether ketone) membranes, processes for their preparation and use thereof
AssigneePorogen Corporation
InventorYouxin Yuan
Life of this patent
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Abstract
Porous poly(aryl ether ketone) (PAEK) articles are prepared from PAEK/polyimide blends by selective chemical decomposition and subsequent removal of the polyimide phase. Porous PAEK articles exhibit highly interconnected pore structure and a narrow pore size distribution. The porous PAEK articles of the present invention can be utilized as a porous media for a broad range of applications, including membranes for fluid separations, such as microfiltration, ultrafiltration, nanofiltration, and as a sorption media.
Claims30
A process for the preparation of a porous poly(aryl ether ketone) article comprising the steps of:
- a. forming a blend of poly(aryl ether ketone) polymer with a polyimide,
- b. forming a shaped article from said blend by extrusion, casting or molding,
- c. decomposing said polyimide in said shaped article into low molecular weight fragments by chemical means by contacting the shaped article with ammonia, tetraalkylammonium hydroxide, primary aliphatic amine, secondary aliphatic amine, or a mixture thereof,
- d. removing said low molecular weight fragments from said article.
1 more element
Dependencies are inferred from the claim text.