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. 10, 2002
Filed:
Jul. 18, 2000
Masahito Takagi, Ibaraki, JP;
Shigeru Yamaguchi, Yao, JP;
Nippon Shokubai Co., Ltd., Osaka, JP;
Abstract
The present invention provides: a novel grafted polymer which has good hydrophilicity and is excellent in the adsorbency and the dispersibility; and a scale inhibitor and a detergent additive, both of which involve the use of this grafted polymer. The grafted polymer is obtained by a production process comprising the steps of: polymerizing an alkylene oxide component with an ethylene oxide content of at least 50 mol % to obtain a polyether compound (A) having a number-average molecular weight of not lower than 200; and graft-polymerizing a graft component (B) onto the resultant polyether compound (A) in a specific ratio, wherein the graft component (B) includes N-vinylpyrrolidone (b1) as an essential component and might further include a monoethylenically unsaturated monomer (b2), wherein when the monomer (b2) includes a carboxyl-group-containing monoethylenically unsaturated monomer (b2-1) including a monomer having a structure formable into a carboxylic acid (or salt) by hydrolysis, the resultant polymer is hydrolyzed such that not less than 50 mol % of all structural units as derived from the monomer (b2-1) can have a carboxyl group. The resultant grafted polymer is used for the scale inhibitor and the detergent additive.