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:
Apr. 16, 2024
Filed:
Sep. 30, 2019
Applicant:
Kurita Water Industries Ltd., Tokyo, JP;
Inventor:
Kazuki Ishii, Tokyo, JP;
Assignee:
KURITA WATER INDUSTRIES LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D 65/08 (2006.01); B01D 61/10 (2006.01); C02F 1/44 (2023.01);
U.S. Cl.
CPC ...
B01D 65/08 (2013.01); B01D 61/10 (2013.01); C02F 1/441 (2013.01); B01D 2321/167 (2022.08); B01D 2321/168 (2013.01); C02F 2303/20 (2013.01);
Abstract
A water treatment chemical for membranes, which contains a polymer compound having a carboxyl group and a sulfo group, preferably a polymer compound represented by formula (1). A membrane treatment method wherein this water treatment chemical for membranes is added to membrane feed water when water to be treated, which contains an organic compound having a phenolic hydroxy group, is subjected to a membrane separation treatment. In the formula, m and n represent molar percentages of respective structural units; (m+n) is 90-100%; and R represents an anionic group containing a sulfo group.