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:
Aug. 27, 2013
Filed:
Aug. 01, 2007
Naosuke Maruyama, Joetsu, JP;
Hiroshi Umezawa, Joetsu, JP;
Naosuke Maruyama, Joetsu, JP;
Hiroshi Umezawa, Joetsu, JP;
Shin-Etsu Chemical Co., Ltd., , JP;
Abstract
Provided are a low-substituted hydroxypropylcellulose powder having high compressibility, good flowability and excellent disintegration, and a method for producing the same. More specifically, provided is a method for producing a low-substituted hydroxypropylcellulose powder having a molar substitution number per anhydrous glucose unit of 0.05 to 1.0, which is insoluble in water and swollenable by absorbing water, comprising the steps of: adding an aqueous sodium hydroxide solution to powdered pulp in such a manner that weight ratio of sodium hydroxide with respect to anhydrous cellulose is 0.1 to 0.3 so as to produce alkali cellulose; etherifying the obtained alkali cellulose to obtain a crude product; neutralizing the sodium hydroxide contained in the obtained crude reaction product; washing the resultant; drying; and pulverizing using by compaction-grinding.