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:
Mar. 17, 2020
Filed:
Jan. 26, 2016
Applicant:
Kemira Oyj, Helsinki, FI;
Inventors:
Asko Karppi, Turku, FI;
Matti Hietaniemi, Espoo, FI;
Anneli Lepo, Tampere, FI;
Kimmo Strengell, Espoo, FI;
Assignee:
Kemira Oyj, Helsinki, FI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D21H 17/45 (2006.01); D21H 21/18 (2006.01); D21H 17/37 (2006.01); D21H 21/10 (2006.01); D21H 17/42 (2006.01); D21H 17/44 (2006.01); C08F 220/56 (2006.01);
U.S. Cl.
CPC ...
D21H 17/455 (2013.01); C08F 220/56 (2013.01); D21H 17/37 (2013.01); D21H 17/375 (2013.01); D21H 17/42 (2013.01); D21H 17/44 (2013.01); D21H 21/10 (2013.01); D21H 21/18 (2013.01);
Abstract
The invention relates to a water-soluble polymer product in particle form, comprising amphoteric polyacrylamide, which is obtained by gel polymerisation of acrylamide together with anionic and cationic monomers. The amphoteric polyacrylamide has a mass average molecular weight MW of 1 500 000-6 000 000 g/mol, and a total ionicity of 4-15 mol-%, whereby the polymer product has a polymer content of at least 60 weight-%. The invention relates also to uses of the polymer product in paper and board making.