Low-substituted cellulose ether powder and production process thereof
US6849729B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 27, 2003 |
| Grant date | Feb 1, 2005 |
| Priority date | — |
| Expiry date | Feb 27, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2301/26
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Provided is a cellulose polymer having a water retention property, and good feeling upon use when applied to the skin and being suitably used as a carrier. More specifically, provided is a low-substituted cellulose ether powder comprising primary particles wherein at least 95% by weight of the primary particles have an aspect ratio of 1.0 to 1.5. Also provided is a production process of a low-substituted cellulose ether powder having a molar substitution degree of 0.05 to 1.0, comprising, during or after the addition of an acid to an alkali solution of low-substituted cellulose ether to neutralize the solution, triturating a resulting mixture; and spray-drying a resulting dispersion. Further provided is a production process of a low-substituted cellulose ether powder having a molar substitution degree of 0.05 to 1.0, comprising shear-triturating a low-substituted cellulose ether powder in water so as to swell-disperse the powder and spray-drying a resulting dispersion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.