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:
Feb. 25, 2020
Filed:
Apr. 27, 2017
Nippon Shokubai Co., Ltd., Osaka, JP;
Atsushi Okada, Osaka, JP;
Nobuhiro Kobayashi, Osaka, JP;
NIPPON SHOKUBAI CO., LTD., Osaka, JP;
Abstract
A method of producing a copolymer of the present invention is a method of producing a specific copolymer and includes: a pure water production step of producing pure water having an electric conductivity of from 0.1 μS/cm to 100 μS/cm; a pure water transfer step of introducing the pure water into a reaction kettle for producing the copolymer through a transfer pipe using, as a material therefor, a resin or a substance forming a passive state in water; and a polymerization step of performing polymerization of the monomer (a), the monomer (b), and the monomer (c) in the reaction kettle, the pure water transfer step including setting the electric conductivity of the pure water at a site where the pure water is introduced from the transfer pipe toward the reaction kettle within a range of from 0.1 μS/cm to 100 μS/cm.