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, 2019
Filed:
Nov. 17, 2016
Applicant:
Nof Corporation, Tokyo, JP;
Inventors:
Akiko Doi, Kawasaki, JP;
Takashi Ichikawa, Kawasaki, JP;
Tsuyoshi Takehana, Kawasaki, JP;
Takuma Tsubusaki, Kawasaki, JP;
Assignee:
NOF CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G 65/326 (2006.01); C08G 65/332 (2006.01);
U.S. Cl.
CPC ...
C08G 65/3322 (2013.01); C08G 65/326 (2013.01);
Abstract
A method for producing polyethylene glycol having a terminal carboxyl group including oxidizing polyethylene glycol represented by formula (I): CHO(CHCHO)(CH)—CHO with potassium peroxymonosulfate in water whose pH is adjusted to be from 6 to 8 with at least one selected from a carbonate, a phosphate, a citrate and an acetate at 5 to 40° C. to produce polyethylene glycol represented by formula (II): CHO(CHCHO)(CH)—COOH, wherein n is a number from 10 to 1,100, and m is 2 or 3.