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:
Jun. 23, 1992
Filed:
Oct. 31, 1988
Edward S Martin, New Kensington, PA (US);
Larry F Wieserman, Apollo, PA (US);
Karl Wefers, Apollo, PA (US);
Kathryn Cross, Murrysville, PA (US);
Aluminum Company of America, Pittsburgh, PA (US);
Abstract
A treated permeable inorganic membrane is disclosed comprising a permeable inorganic membrane capable of reacting with an organic acid. The treated membrane has good chemical stability over a pH range of from 1 to 14, is capable of controlling the flux through the membrane, has altered internal and external wetting properties of the membrane surface, and has controlled pore size due to the presence of a monomolecular layer of an organic acid material chemically bonded to the surface of the inorganic membrane. The monomolecular layer of organic acid material is formed on the membrane surface by contacting the membrane with an organic acid reactant selected from the class consisting of phosphonic acid having the formula RPO(OH).sub.2 ; phosphinic acid having the formula RR'PO(OH); monocarboxylic acids having the formula RCOOH; dicarboxylic acids having the formula R'(COOH).sub.2 ; boronic acid having the formula RB(OH).sub.2 ; and one or more precursors of the foregoing acids which decompose to form the acid functionality; where R comprises a 1-30 carbon-containing group, R' comprises hydrogen or a 1-30 carbon-containing group, and R' comprises a 2-30 carbon-containing group. Excess organic acid reactant not bonded to the underlying membrane surface is removed to ensure formation of said monomolecular layer of said organic acid material on the surfaces of said permeable inorganic membrane.