Solution spinning process for producing a polyethylene terephthalate filament
US5061425A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 7, 1989 |
| Grant date | Oct 29, 1991 |
| Priority date | — |
| Expiry date | Sep 7, 2009 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01F6/62
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A process for producing a high modulus, high tenacity polyethylene terephthalate filament which comprises (1) spinning a solution of polyethylene terephthalate in an organic solvent through a die to produce a solution spun filament, wherein the polyethylene terephthalate has an intrinsic viscosity of at least about 1.0 dl/g and wherein the organic solvent is selected from the group consisting of (a) hexafluoroisopropanol, (b) trifluoroacetic acid, (c) mixed solvent systems containing from about 20 weight percent to about 99 weight percent hexafluoroisopropanol and from about 1 weight percent to about 80 weight percent dichloromethane, and (d) mixed solvent systems containing from about 20 weight percent to about 99 weight percent trifluoroacetic acid and from about 1 to about 80 weight percent dichloromethane; and (2) subsequently drawing the solution spun filament to a total draw ratio of at least about 7:1 to product the high modulus, high tenacity polyethylene terephthalate filament.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.