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:
Jul. 23, 2024
Filed:
Mar. 29, 2019
Applicant:
S.p.c.m. SA, Andrezieux-Boutheon, FR;
Inventors:
Assignee:
S.P.C.M. SA, Andrezieux-Boutheon, FR;
Primary Examiner:
Int. Cl.
CPC ...
C08F 2/16 (2006.01); C08F 8/28 (2006.01); C08F 220/56 (2006.01); C08F 220/58 (2006.01); C08K 5/07 (2006.01); D21H 17/43 (2006.01); D21H 21/18 (2006.01);
U.S. Cl.
CPC ...
C08F 2/16 (2013.01); C08F 8/28 (2013.01); C08F 220/56 (2013.01); C08K 5/07 (2013.01); D21H 17/43 (2013.01); D21H 21/18 (2013.01); C08F 220/585 (2020.02);
Abstract
The invention relates to a method for producing anionic polymers that are hydrosoluble in an aqueous solution, comprising at least the following successive steps: b) polymerisation, in an aqueous solution, of anionic monomers containing at least 5 mol % of 2-acrylamido-2-methylpropane sulfonic acid and/or one of the salts thereof and optionally non-ionic monomers up to a mass concentration of polymer A of between 5 and 40%, b) addition of at least one aldehyde into the solution produced in step a), and c) acidification to a pH of between 3 and 4 of the solution produced in step b). The invention also relates to the use thereof in a paper-making method.