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AssigneesShin-Etsu Chemical Co., Ltd., SE Tylose GmbH & Co. KG
InventorsAkira Kitamura, Atsushi Yamamoto, Mitsuo Narita, Heiko Nebel, Andreas Schultz
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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.
A method for producing an alkyl cellulose, comprising the steps of:
An alkyl cellulose having a viscosity at 20° C. of a 1% by weight aqueous solution of the alkyl cellulose of 2,550 to 9,450 mPa·s as measured by a Brookfield viscometer, and having a storage elastic modulus G′(65° C.) at 65° C. of a 1.5% by weight aqueous solution thereof of 2,000 to 4,500 Pa.
Dependencies are inferred from the claim text.