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. 27, 2018
Filed:
Jan. 03, 2014
Composite polyamide membrane made via interfacial polymerization using a blend of non-polar solvents
Dow Global Technologies Llc, Midland, MI (US);
Abhishek Roy, Edina, MN (US);
Yasushi Maeda, Gotemba, JP;
Mou Paul, Edina, MN (US);
Steven Rosenberg, Shorewood, MN (US);
Ian A. Tomlinson, Midland, MI (US);
DOW GLOBAL TECHNOLOGIES LLC, Midland, MI (US);
Abstract
A method for making a composite polyamide membrane comprising a porous support and a thin film polyamide layer, wherein the method includes: i) applying a polar solution comprising a polyfunctional amine monomer, and a non-polar solution comprising a polyfunctional acyl halide monomer to a surface of a porous support and interfacially polymerizing the monomers to form a thin film polyamide layer, wherein the non-polar solution further comprises at least 50 vol % of a Cto Caliphatic hydrocarbon and from 2 to 25 vol % of benzene or benzene substituted with one or more Cto Calkyl groups; and ii) applying an aqueous solution of nitrous acid to the thin film polyamide layer.