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:
Jun. 30, 2020
Filed:
Mar. 06, 2017
Shin-etsu Chemical Co., Ltd., Tokyo, JP;
Takuya Yokosawa, Niigata-ken, JP;
Naosuke Maruyama, Niigata-ken, JP;
Akira Kitamura, Niigata-ken, JP;
SHIN-ETSU CHEMICAL CO., LTD., Tokyo, JP;
Abstract
Provided are a solid preparation comprising an alkyl cellulose which provides excellent moldability and disintegrability even in a small amount of the alkyl cellulose, and a production method therefor. Specifically, provided are a solid preparation having an alkyl cellulose having a specific surface area by BET method of 0.5 to 10.0 m/g and a dissolution start temperature of 5 to 27° C.; and a method for producing a solid preparation having the steps of: mixing a cellulose pulp and 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, mixing the first reaction mixture and a second alkali metal hydroxide solution with stirring and without further addition of any alkylating agent to obtain a second reaction mixture, and pulverizing an alkyl cellulose isolated from the second reaction mixture to obtain an alkyl cellulose.