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:
Jan. 05, 2021
Filed:
Dec. 10, 2015
Shin-etsu Chemical Co., Ltd., Tokyo, JP;
SE Tylose Gmbh & Co. KG, Wiesbaden, DE;
Akira Kitamura, Joetsu, JP;
Atsushi Yamamoto, Joetsu, JP;
Mitsuo Narita, Joetsu, JP;
Heiko Nebel, Wiesbaden, DE;
Andreas Schultz, Hanau, DE;
Shin-Etsu Chemical Co., Ltd., Tokyo, JP;
SE Tylose GmbH & Co. KG, Wiesbaden, DE;
Abstract
Provided is a method for producing an alkyl cellulose having a high viscosity and not having an excessively high gel strength. More specifically, there is provided a method for producing an alkyl cellulose comprising the steps of: mixing a cellulose pulp with a first alkali metal hydroxide solution with stirring to obtain alkali cellulose; reacting the alkali cellulose with an alkylating agent to obtain a first reaction mixture; blending a second alkali metal hydroxide solution with the first reaction mixture with stirring, without further blending of the alkylating agent, to obtain a second reaction mixture; and purifying the second reaction mixture to obtain an alkyl cellulose. There is also provided an alkyl cellulose being produced by the above method and having a degree of substitution of alkyl group of 27 to 33% by weight.