The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 29, 1991
Filed:
Aug. 29, 1990
Un Y Kim, Seoul, KR;
Yong S Kang, Seoul, KR;
Jae J Kim, Seoul, KR;
Sung W Song, Seoul, KR;
Hyun C Park, Seoul, KR;
Korea Institute of Science and Technology, Seoul, KR;
Abstract
A process for the preparation of surface modified, multilayered, composite membranes are disclosed. This process comprises the steps of: subjecting the surface of porous polysulfone membranes to sulfonation to introduce sulfonic acid functional groups onto the surface of the membranes; and either subjecting the sulfonic acid functional groups so introduced to silylation with reactive polysiloxanes to undergo grafting the polysiloxanes on the introduced functional groups, followed by applying polysiloxanes coating along with cross-linking agent onto so treated membranes to allow to undergo cross-linking; or carrying out both the silylation step and the coating and cross-linking step simultaneously. The membranes so produced are useful in gas separation systems for oxygen enrichment of air.