Process for the obtaining of poly(vinylidene fluorine) yarns and fibers
US3965232A · kind A · utility
3Cited by
9References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 30, 1974 |
| Grant date | Jun 22, 1976 |
| Priority date | — |
| Expiry date | May 30, 1994 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01F6/32
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A process of making polyvinylidene fluoride yarns and fibers of homogeneous structure and good dry strength includes the steps of spinning the solution of the polymer into a coagulating bath containing 45 to 60% by weight aprotic polar organic solvent and 40 to 55% by weight water, stretching the filaments in air to a ratio of 1.5 to 5x and then in boiling water to a ratio of 1.5 to 4x (overall stretching ratio of 3x to 6.5x) and then washing in water at room temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.