High strength fibers of stereoregular polystrene
US5071917A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 1990 |
| Grant date | Dec 10, 1991 |
| Priority date | — |
| Expiry date | Aug 20, 2010 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01F6/22
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The invention is a crystalline fiber comprising syndiotactic polystyrene, or a mixture. Preferably the fiber is a high strength fiber isotactic polystyrene and syndiotactic polystyrene wherein the fiber is monoaxially oriented, has a tensile strength of about 10,000 psi or greater, and a modulus of about 1,000,000 psi or greater. In another aspect the invention is a process for the preparation of fibers of syndiotactic polystyrene, or a mixture of isotactic polystyrene and syndiotactic polystyrene which comprises: PA0 A. contacting syndiotactic polystyrene, or a mixture of isotactic polystyrene and syndiotactic polystyrene with a solvent for the polystyrene at elevated temperatures under conditions such that a homogenous solution is formed which has sufficient viscosity to be extruded; PA0 B. extruding the solution through an orifice to form a fiber at elevated temperatures; PA0 C. quenching the fiber by passing the fiber through one or more zones under conditions such that the fiber solidifies; PA0 D. removing the solvent for the polystyrene from the fiber; and PA0 E. cooling the fiber to ambient temperature. In the embodiment where it is desirable to prepare high strength fibers,…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.