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:
Jan. 06, 1981
Filed:
Nov. 08, 1979
Robert L Riley, La Jolla, CA (US);
Richard L Grabowsky, Bakersfield, CA (US);
UOP Inc., Des Plaines, IL (US);
Abstract
Membranes, which may be used for the separation of gases, comprise a thin film of a semi-permeable material composited on a porous support member. The membranes are prepared by passing a support member through a solution of a halogenated hydrocarbon solvent containing a semi-permeable membrane forming prepolymer and cross-linking agent. This step is then followed by the cross-linking of the prepolymer by treatment at an elevated temperature. The process may be exemplified by passing one finely porous surface of a cellulose nitrate-cellulose acetate support member through a solution of dimethyl silicone in a halogenated solvent such as trifluorotrichloroethane followed by treatment at a temperature in the range of from about 50.degree. to about 150.degree. C. to form the desired membrane.