Anisotropic cellulose articles, fibers, and films and method of producing same
US4840673A · kind A · utility
1Cited by
15References
22Claims
0Family size
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Key dates
| Filing date | Mar 9, 1988 |
| Grant date | Jun 20, 1989 |
| Priority date | — |
| Expiry date | Mar 9, 2008 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01F2/02
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Lyotropic mesophase (liquid crystalline) solutions of cellulose are formed in an ammonia/ammonium thiocyanate solvent. The nature of the solution can be controlled to selectively produce lyotropic cellulose mesophases having either nematic or cholesteric character. High strength, high modulus fibers are produced from a lyotropic mesophase solution of cellulose essentially in the nematic phase. The films are prepared from mesophase solutions of cellulose that are mainly in the cholesteric phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.