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:
May. 15, 2018
Filed:
Sep. 02, 2014
Applicant:
Upm-kymmene Corporation, Helsinki, FI;
Inventors:
Markus Nuopponen, Helsinki, FI;
Timo Paakkonen, Helsinki, FI;
Raili Ponni, Vantaa, FI;
Tapani Vuorinen, Espoo, FI;
Assignee:
UPM-KYMMENE CORPORATION, Helsinki, FI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08B 1/08 (2006.01); C08B 15/04 (2006.01); D21C 9/02 (2006.01); C08B 15/02 (2006.01); D21C 9/00 (2006.01); D21H 11/18 (2006.01);
U.S. Cl.
CPC ...
C08B 15/04 (2013.01); C08B 1/08 (2013.01); C08B 15/02 (2013.01); D21C 9/004 (2013.01); D21C 9/005 (2013.01); D21C 9/02 (2013.01); D21H 11/18 (2013.01);
Abstract
A method for catalytic oxidation of cellulose using a heterocyclic nitroxyl radical as catalyst and main oxidant acting as oxygen source comprises, before the catalytic oxidation of the cellulose, pretreatment of the cellulose—in an alkaline pretreatment step, where the cellulose is treated in alkaline solution having hydroxide concentration of above 0.3 M, and—in a washing step, where the cellulose treated in the alkaline solution is washed to lower the pH.