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:
Jun. 29, 1982
Filed:
Jan. 31, 1979
Applicant:
Inventors:
Shunichi Doi, Yokohama, JP;
Masatake Kamogawa, Yokohama, JP;
Assignees:
Nitto Chemical Industry Co., Ltd., Tokyo, JP;
Mitsubishi Rayon Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
2605 / ;
Abstract
This disclosure relates to a process for the purification of 2-acrylamido-2-methylpropanesulfonic acid, which comprises dissolving said sulfonic acid in hydrous acetic acid of a water content of 3 to 80% by weight at 60.degree. to 110.degree. C. and subjecting the resulting solution to recrystallization. The purified product thus obtained is useful particularly as a starting material in preparing a high-molecular-weight polymer or copolymer.