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:
Nov. 02, 2021
Filed:
Mar. 29, 2018
Applicant:
Kemira Oyj, Helsinki, FI;
Inventors:
Assignee:
Kemira Oyj, Helsinki, FI;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
D21H 11/18 (2006.01); D21H 17/37 (2006.01); B32B 27/10 (2006.01); D21H 17/25 (2006.01); D21H 21/10 (2006.01); D21H 21/20 (2006.01);
U.S. Cl.
CPC ...
D21H 11/18 (2013.01); D21H 17/375 (2013.01); B32B 27/10 (2013.01); D21H 17/25 (2013.01); D21H 21/10 (2013.01); D21H 21/20 (2013.01);
Abstract
The invention relates to a method for producing paper, board or the like. The method comprises obtaining a fibre stock comprising lignocellulosic fibres and adding a retention agent system comprising a cationic synthetic polymer to the fibre stock and forming a fibrous web from the fibre stock and drying the web. Microfibrillated non-wood cellulose is added to the fibre stock as a component of the retention agent system and sequentially with the cationic synthetic polymer.