Patent ID: 9487594
Filing Date: 2016-11-08
CPC Classification: C08B

Claim Text:
1. A method for producing a water-soluble nonionic cellulose ether, comprising: an etherification step of reacting an alkali cellulose with an etherifying agent to obtain a crude cellulose ether, a washing step of washing the crude cellulose ether with water to obtain a washed cellulose ether, a drying step of drying the washed cellulose ether, and a grinding step of grinding the cellulose ether during or after the drying step, wherein in the washing step or in any of the steps after the washing step, no acid is mixed but a pH regulator is mixed so as to allow an aqueous 2% by weight solution of the cellulose ether as an end product to have a pH value of from 7.0 to 10.5, and wherein the pH regulator is at least one selected from the group consisting of sodium hydroxide, potassium hydroxide, sodium bicarbonate, and sodium carbonate.