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. 26, 2018
Filed:
Feb. 27, 2015
Applicant:
Kemira Oyj, Helsinki, FI;
Inventors:
Assignee:
KEMIRA OYJ, Helsinki, FI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D21H 17/34 (2006.01); C08F 293/00 (2006.01); C02F 1/56 (2006.01); C02F 11/14 (2006.01); C08F 295/00 (2006.01); D21H 17/37 (2006.01); D21H 21/06 (2006.01); D21H 21/10 (2006.01); C08F 8/12 (2006.01); C02F 1/52 (2006.01); C08F 226/02 (2006.01);
U.S. Cl.
CPC ...
C08F 293/00 (2013.01); C02F 1/5272 (2013.01); C02F 1/56 (2013.01); C02F 11/14 (2013.01); C08F 8/12 (2013.01); C08F 295/00 (2013.01); D21H 17/34 (2013.01); D21H 17/37 (2013.01); D21H 17/375 (2013.01); D21H 21/06 (2013.01); D21H 21/10 (2013.01); C08F 226/02 (2013.01);
Abstract
New polyvinylamide and/or acryl acid-based copolymers. The new structured block copolymers are based on the block copolymerization of N-vinyl formamide (NVF) with other monomers by using a bifunctional initiator. Further, a method of preparing the structured block copolymer is provided, and especially a method wherein the NVF-based block is at least partially hydrolyzed to obtain PVAm. Also the use of the new structured block copolymers in sludge dewatering and in papermaking processes is disclosed.