Supplementation of cellulose nanofibrils with carboxycellulose with low degree of substitution
US6231657A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 7, 1999 |
| Grant date | May 15, 2001 |
| Priority date | — |
| Expiry date | May 7, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2205/02
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The invention concerns compositions containing essentially amorphous cellulose nanofibrils, carboxyl cellulose with a degree of substitution not more than o.95 as additive, and optionally at least one co-additive, the content in additive and optional co-additive being less than 30 wt. % relative to the weight of nanofibrils and additive and optional co-additive. The invention also concerns a method for preparing such compositions, consisting in adding to a substantially amorphous nanofibril suspension, the additive and optionally the co-additive(s), then in drying the suspension thus additivated. The resulting compositions are easily redispersable and preserve all their rheological properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.