Method for preparing low-substituted cellulose ethers
US4091205A · kind A · utility
40Cited by
5References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 26, 1975 |
| Grant date | May 23, 1978 |
| Priority date | — |
| Expiry date | Nov 26, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08B11/20
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
In the process for the preparation of low-substituted cellulose ethers comprising the successive steps of etherification of alkali cellulose, neutralization of the crude cellulose ether, washing, drying and pulverization, the neutralization step is carried out in two stages, i.e., by first employing 5 to 80% of an acid stoichiometrically required and then adding an additional amount of the acid to complete neutralization. The cellulose ethers thus prepared can readily be pulverized into fine powder having a very good flowing property and yet an excellent binding force, and work as a suitable disintegrator in tablets.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.