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:
Aug. 13, 2024
Filed:
Feb. 28, 2022
Infinited Fiber Company Oy, Espoo, FI;
Erkki Malanin, Espoo, FI;
Jani Mäkelä, Espoo, FI;
Sakari Siren, Espoo, FI;
Martin Stjernberg, Espoo, FI;
Ali Harlin, Espoo, FI;
Infinited Fiber Company Oy, Espoo, FI;
Abstract
According to an example aspect of the present invention, there is provided a method of producing cellulose carbamate in an aqueous phase. The method comprises the steps of a) providing a cellulose raw-material; b) providing urea; c) mixing cellulose and urea to provide a mixture; d) subjecting the mixture to a reduced pressure of no more than 350 mbar(a); e) heating the mixture to a temperature of 130 to 150° C. to subject cellulose to reaction with urea to form cellulose carbamate; f) releasing the pressure; and g) recovering the cellulose carbamate g) recovering the cellulose carbamate, and h) washing the cellulose carbamate with water to remove water soluble nitrogenous compounds wherein the water-soluble nitrogeneous compounds make up at the most 12%, preferably 6% or less, of the total weight of cellulose carbamate and water-soluble nitrogenous compounds.