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. 05, 2003
Filed:
Jan. 11, 2001
Naosuke Maruyama, Niigata-ken, JP;
Hiroshi Umezawa, Niigata-ken, JP;
Shin-Etsu Chemical Co., Ltd., , JP;
Abstract
An object of the present invention is to provide a process for the production of low-substituted hydroxypropyl cellulose wherein, in the formation of low-substituted hydroxypropyl cellulose particles, a granular material obtained by granulating the reaction product is neutralized with an acid to form neutralization-precipitated particles of low-substituted hydroxypropyl cellulose which can reduce the treating time as compared with conventional processes and, moreover, permit its ash content to be easily decreased in a subsequent washing step. Specifically, the reaction product of an alkali cellulose with a hydroxypropylating agent is granulated, and the resulting granular material is neutralized with an acid.