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. 31, 2020
Filed:
Dec. 13, 2013
Upm-kymmene Corporation, Helsinki, FI;
Taisto Tienvieri, Vantaa, FI;
Isko Kajanto, Espoo, FI;
Tero Ojala, Oravala, FI;
Sami Saarela, Helsinki, FI;
Markus Nuopponen, Helsinki, FI;
Timo Paakkonen, Helsinki, FI;
Tapani Vuorinen, Espoo, FI;
UPM-KYMMENE CORPORATION, Helsinki, FI;
Abstract
Cellulose is oxidized catalytically using a heterocyclic nitroxyl radical as catalyst, main oxidant acting as oxygen source, and an activator of the heterocyclic nitroxyl radical. The oxidation is performed in a reaction medium which is at medium consistency of cellulosic pulp, which is above 6%, more preferably equal to or higher than 8%, and most preferably in the range of 8-12%. The reaction medium is mixed in a reactor through circulation of the reaction medium back to the reactor.