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. 29, 2011
Filed:
Nov. 23, 2006
Kyösti Valta, Tampere, FI;
Eino Sivonen, Ruutana, FI;
Tero Malm, Tampere, FI;
Valtion Teknillinen Tutkimuskeskus, Espoo, FI;
Abstract
A method for preparing a cellulose carbamate solution. Dissolving is performed in two steps, first by moistening cellulose carbamate pulp with a dilute alkaline solution and second by admixing a concentrated alkaline solution, as cold as possible, to the pulp under intensive stirring. The technique utilizes the low freezing point of the aqueous NaOH solution at the concentration of 18%, wherein the freezing point is below −20° C., and the intensive stirring function of the dissolve mixer device during the dosage. It is possible to prepare solutions of high quality and having high dry matter content in a mixing time of a few minutes only.