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:
May. 20, 2025
Filed:
Dec. 21, 2020
Applicant:
Nof Corporation, Tokyo, JP;
Inventors:
Ryo Kawahara, Kawasaki, JP;
Atsushi Sato, Kawasaki, JP;
Midori Hirai, Kawasaki, JP;
Kyu Takeuchi, Kawasaki, JP;
Assignee:
NOF CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G 65/30 (2006.01); C08G 65/325 (2006.01);
U.S. Cl.
CPC ...
C08G 65/30 (2013.01); C08G 65/325 (2013.01); Y02P 20/55 (2015.11);
Abstract
A method for purifying a polyethylene glycol compound represented by formula [1], including a Step (A) of dissolving the compound represented by formula [1] in an organic solvent having a Hildebrand solubility parameter of 8 to 10 (cal/cm)to obtain a solution, and a Step (B) of mixing the solution with 0.1 to 1 part by mass of an adsorbent made from a hydrotalcite having a specific surface area of 50 to 200 m/g with respect to 1 part by mass of the compound of the formula [1] to prepare a slurry, where Z, Y, Y, A, Polymer, X, a, b, l and m are as defined herein.