Syndiotactic polypropylene fibers
US7025919B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 28, 2002 |
| Grant date | Apr 11, 2006 |
| Priority date | — |
| Expiry date | Mar 11, 2023 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01F6/06
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A process for the production of partially oriented polypropylene fibers from syndiotactic polypropylene. Syndiotactic polypropylene is heated to a molten state and extruded to form a fiber preform. The fiber preform is spun at a forward spinning speed within the range of about 700–3500 meters per minute to produce a partially oriented fiber. The partially oriented fiber is wound without further substantial orientation of the fiber at a draw ratio of less than 1.5. By operating at a forward spinning speed of about 700 meters per minute or more, the partially oriented fiber has a greater tenacity than would be observed for a fiber formed from a corresponding spun isotactic polypropylene. The fiber preform is spun at a forward spinning speed of at least 100 meters per minute to provide a tenacity on the order of about 2 grams per denier or more. The fiber preform may be spun at a forward spinning speed of at least 1500 meters per minute to provide a tenacity of about 3 grams per denier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.