Water-soluble cellulose ether and method for producing the same
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United States of America Patent
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Mar 9, 2021
Grant Date -
Jan 10, 2019
app pub date -
Jun 20, 2018
filing date -
Jul 5, 2017
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Abstract
A method for producing a highly viscous water-soluble cellulose ether has a small undissolved fiber content and a high loose bulk density. More specifically, a production method includes steps of: bringing cellulose pulp into contact with an alkali metal hydroxide solution to obtain an alkali cellulose mixture; draining the alkali cellulose mixture to obtain an alkali cellulose; reacting the alkali cellulose with an etherifying agent to obtain a water-soluble cellulose ether mixture; washing and draining the water-soluble cellulose ether mixture to obtain a first moist cellulose ether; mixing the first moist cellulose ether with water to obtain a second moist cellulose ether; coarsely pulverizing the second moist cellulose ether with a coarse pulverizer to obtain a coarsely pulverized cellulose ether; cooling the coarsely pulverized cellulose ether; and then drying and pulverizing the coarsely pulverized cellulose ether.
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