Biodegradable fiber and process for preparing the same
US6645622B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 10, 2002 |
| Grant date | Nov 11, 2003 |
| Priority date | — |
| Expiry date | Jun 10, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2913
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The object of the present invention is to provide melt-extrusion conditions and drawing process which enable to carry out stable and smooth fiber spinning of polyester produced by microorganisms, particularly P(3HB-CO-3HH) which conventionally had problems in spinning stability, as well as P(3HB) and P(3HB-CO-3HV). Another object of the present invention is to obtain filament having particular properties according to the process. The process comprises extruding a thermoplastic polymer from a melt-extruder, then rapidly cooling the same to at most the glass transition point of the polymer immediately after the extrusion to prevent the filament from blocking, and carrying out partial crystallization of the same rapidly at not less than the glass transition point.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.