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:
Nov. 01, 1983
Filed:
Apr. 15, 1981
Pak S Leung, Highland Mills, NY (US);
Anthony R Cacciola, Pleasantville, NY (US);
Union Carbide Corporation, Danbury, CT (US);
Abstract
A coating is applied to a microporous support in the presence of a volatile liquid capable of drawing the coating into the support and of desolvating the coating. The liquid is thereafter volatilized with the resulting dry ultrafiltration membrane being essentially crack-free and having desirable mechanical and chemical stability. The support may be pretreated with a volatile liquid, such as acetone, prior to the applying of the coating to the support. Alternately, the coating material can be dispersed in a volatile liquid, such as methanol, to form a coating suspension that is applied to the support. The coating material, preferably zirconia, will have a particle size within the range of from about 5 m.mu. to about 10.mu., with the coating having a thickness of up to about 20.mu.. The support, such as a porous carbon tube, will have a pore volume of about 5-60% and a pore size of about 5 m.mu.-40.mu.. Stability is enhanced by firing the membrane at 25.degree. C.-1500.degree. C. preferably at about 400.degree. C.-600.degree. C.