Cellulose fibers of liquid-crystal origin having a high elongation at break and processes for obtaining such fibers
US6139959A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 5, 1999 |
| Grant date | Oct 31, 2000 |
| Priority date | — |
| Expiry date | Aug 5, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2965
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A cellulose formate fiber of liquid-crystal origin, having a high elongation at break and having the following characteristics: PA1 a) under an optical polarizing microscope, its filaments have a banded structure typical of its liquid-crystal origin; PA1 b) it satisfies the following relationships: PA2 DS.gtoreq.2; Ar.gtoreq.8; Te<45; Mi>500; Er>10, PA2 DS being the degree of substitution of the cellulose with formate groups in the fiber (in %), Ar the elongation at break (in %) of the fiber, Te its tenacity (in cN/tex), Mi its initial modulus (in cN/tex) and Er its energy at break (in J/g). Also, a process for obtaining this cellulose formate fiber by "dry-jet-wet-spinning" of a liquid-crystal solution of cellulose formate, in which water is used as coagulating agent. A fiber of cellulose regenerated from cellulose formate which itself has a high value of elongation at break, and a process for obtaining this fiber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.