Method for the formation of low-substituted hydroxypropyl cellulose particles
US6602995B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 11, 2001 |
| Grant date | Aug 5, 2003 |
| Priority date | — |
| Expiry date | Apr 6, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08B11/08
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.