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:
Jul. 12, 2016
Filed:
Oct. 02, 2013
Nippon Shokubai Co., Ltd., Osaka-shi, Osaka, JP;
Masato Nakano, Osaka, JP;
Yuki Sano, Osaka, JP;
NIPPON SHOKUBAI CO., LTD., Osaka, JP;
Abstract
Provided is a copolymer having excellent calcium ion trapping ability, calcium carbonate dispersing capacity, and gel resistance. A (meth)acrylic acid-based copolymer contains, as essential structural units, a structural unit (a) derived from a monomer represented by the following formula (1) in an amount of 2% by mole or more and 9% by mole or less, and a structural unit (b) derived from a (meth)acrylic acid (salt) in an amount of 91% by mole or more and 98% by mole or less, relative to 100% by mole of structural units derived from all monomers, wherein the copolymer contains a sulfonic acid (salt) group at least one end of the main chain and has a weight average molecular weight of 7000 to 100000, wherein Rrepresents a hydrogen atom or a methyl group; and X and Y each independently represent a hydroxyl group or a sulfonic acid (salt) group (at least one of X and Y represents a sulfonic acid (salt) group).