Depolymerized cellulosic material with low crystallinity obtained from cellulosic fibers and process for its manufacture
US4357467A · kind A · utility
8Cited by
7References
14Claims
0Family size
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Key dates
| Filing date | Jun 20, 1980 |
| Grant date | Nov 2, 1982 |
| Priority date | — |
| Expiry date | Jun 20, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08B15/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Depolymerized cellulose powder having substantially an amorphous structure which is obtained by letting cellulose fibers dissolve in concentrated hydrochloric acid of about 40% and at a temperature of at least 38.degree. C. A homogeneous acid hydrolysis is carried out under well controlled conditions in order to depolymerize the dissolved cellulose and is stopped when the cellulose has achieved a mean degree of polymerization between 10 and 200. The depolymerized dissolved cellulose is then separated and processed in order to obtain the aforesaid powder of amorphous depolymerized cellulose.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.