Patent ID: 9481738
Filing Date: 2016-11-01
CPC Classification: C08B

Claim Text:
1. A method for producing cellulose ether, comprising at least the steps of: providing at least two alkali cellulose materials having different compositions, each of the materials having been prepared by bringing a pulp into contact with a solution having an alkali metal hydroxide concentration of 23 to 60% by weight and draining; mixing the at least two alkali cellulose materials having different compositions to obtain alkali cellulose, and reacting the alkali cellulose with an etherifying agent, wherein each weight ratio of the alkali metal hydroxide in each of the alkali cellulose materials having different compositions to a solid component in the pulp used to prepare the respective alkali cellulose material (alkali metal hydroxide/solid component in pulp) is equal to 0.4 to 2.5 times a weight ratio of alkali metal hydroxide in the alkali cellulose obtained in the step of mixing to a sum of the solid components in the pulps used for preparation of the alkali cellulose materials.