Patent · US Active

Method for preparing a cellulose carbamate solution

US8066903B2 · kind B2 · utility

0Cited by

6References

16Claims

0Family size

Assignee

VALTION TEKNILLINEN TUTKIMUSKESKUS · FI

Inventors

Kyösti Valta · Tampere, FI
Eino Sivonen · Tampere, FI
Tero Malm · Tampere, FI

Key dates

Filing date	Nov 23, 2006
Grant date	Nov 29, 2011
Priority date	—
Expiry date	Apr 1, 2027

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08L1/08
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.