Process for spinning naphthalate polyester fibers
US4000239A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 1973 |
| Grant date | Dec 28, 1976 |
| Priority date | — |
| Expiry date | Nov 30, 1993 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01F6/62
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A filament, fiber or yarn consisting of a naphthalate polyester containing at least 85 mol % of ethylene-2,6-naphthalate units and having an intrinsic viscosity of 0.45 to 1.0, said filament, fiber or yarn having a diffrection intensity ratio (R) between a bragg refection angle 2.theta. = 187.7.degree. and 2.theta. = 15.6.degree., as determined by the X-ray diffraction method, being in the range of more than 1.73 and up to 5.00. Electrically insulating material can be produced by heat-treating a fabric consisting mainly of the above naphthalate polyester fibers and with a sleeve consisting mainly of the above naphthalate polyester fibers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.