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:
Mar. 09, 2021
Filed:
Jun. 20, 2018
Shin-etsu Chemical Co., Ltd., Tokyo, JP;
Akira Kitamura, Joetsu, JP;
Mitsuhiro Yoshida, Joetsu, JP;
SHIN-ETSU CHEMICAL CO., LTD., Tokyo, JP;
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.