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:
Sep. 30, 2014
Filed:
May. 08, 2012
Takeo Fukui, Tokyo, JP;
Tetsuo Mizuniwa, Tokyo, JP;
Kazuhiko Tokunaga, Kitakyushu, JP;
Masako Yasutomi, Kitakyushu, JP;
Takeo Fukui, Tokyo, JP;
Tetsuo Mizuniwa, Tokyo, JP;
Kazuhiko Tokunaga, Kitakyushu, JP;
Masako Yasutomi, Kitakyushu, JP;
Kurita Water Industries Ltd., Tokyo, JP;
Abstract
This invention relates to a method for manufacturing a cation exchange resin, wherein the method includes the steps of: copolymerizing a monovinyl aromatic monomer and a cross-linkable aromatic monomer to obtain a cross-linked copolymer; specifying a content of a leachable compound represented by formula (I) to be 400 μg or less relative to 1 g of the cross-linked copolymer, wherein Z represents a hydrogen atom or an alkyl group, and l represents a natural number; and then sulfonating the cross-linked copolymer to form a sulfonylated cross-linked copolymer.