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:
Jan. 07, 2014
Filed:
Mar. 18, 2009
Applicants:
René Hund, Villars, FR;
Christophe Auriant, Saint Etienne, FR;
Inventors:
René Hund, Villars, FR;
Christophe Auriant, Saint Etienne, FR;
Assignee:
S.P.C.M. SA, Andrezieux Boutheon, FR;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08F 20/56 (2006.01); C08F 8/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
In a process for preparing cationic or amphoteric (co)polymers derived from acrylamide by a Hofmann degradation reaction in aqueous solution in the presence of an alkali and/or alkaline-earth metal hydroxide and an alkali metal hypohalide on a base copolymer, a solution of base copolymer on which the reaction is performed contains a polyvalent cationic salt representing at least 0.5% by weight, preferably from 2 to 10% by weight of the base copolymer.