Method for preparing tubing and hollow fibers from non-crosslinked polyvinyl alcohol hydrogels
US5225120A · kind A · utility
34Cited by
2References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 16, 1992 |
| Grant date | Jul 6, 1993 |
| Priority date | — |
| Expiry date | Mar 16, 2012 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01F6/14
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
This invention relates to hollow elongate articles such as tubing and fibers formed from non-crosslinked polyvinyl alcohol. The articles are prepared by extruding a solution of polyvinyl alcohol in the shape of the desired article into a coagulating bath concurrently with a stream of a non-solvent for the polymer. The stream occupies the area corresponding to the interior cavity of the article and prevents collapse of the cavity until the article has solidified in the coagulation bath.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.