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:
Apr. 30, 2019
Filed:
Aug. 18, 2015
Applicant:
Kemira Oyj, Helsinki, FI;
Inventors:
Matti Hietaniemi, Espoo, FI;
Marcus Lillandt, Ingå, FI;
Kari Vanhatalo, Espoo, FI;
Asko Koskimäki, Helsinki, FI;
Assignee:
Kemira Oyj, Helsinki, FI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D21H 11/08 (2006.01); D21H 11/18 (2006.01); D21H 11/20 (2006.01); D21H 17/29 (2006.01); D21H 17/37 (2006.01); D21H 17/49 (2006.01); D21H 17/67 (2006.01); D21H 21/18 (2006.01); D21H 23/04 (2006.01);
U.S. Cl.
CPC ...
D21H 21/18 (2013.01); D21H 11/08 (2013.01); D21H 11/18 (2013.01); D21H 11/20 (2013.01); D21H 17/29 (2013.01); D21H 17/37 (2013.01); D21H 17/375 (2013.01); D21H 17/49 (2013.01); D21H 17/67 (2013.01); D21H 23/04 (2013.01);
Abstract
The invention relates to a strength agent for paper, board or the like. The strength agent comprises a first component, which is refined cellulosic fibers having a refining level of >70° SR, and a second component, which is a synthetic cationic polymer having a charge density of 0.1-2.5 meq/g, determined at pH 2.7, and an average molecular weight of >300 000 g/mol. The invention relates also to a use of the strength agent and to a method for increasing strength properties of paper, board or the like.