Method for producing polyethylene terephthalate fibers with reduced flammability
US5382474A · kind A · utility
14Cited by
5References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 24, 1992 |
| Grant date | Jan 17, 1995 |
| Priority date | — |
| Expiry date | Sep 24, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2913
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Disclosed is a process for producing polyethylene terephthalate fibers with reduced flammability which comprises the following steps: PA1 (a) condensating terephthalic acid and ethylene glycol in a mole ratio of from 1:1.1-1.5 at a temperature of from 180.degree.to 240.degree. C. in the presence of a catalyst; PA1 (b) adding a polyalkylene glycol phosphate ester; PA1 (c) polycondensating at a temperature of from 265.degree.-280.degree. C. under a pressure decreasing from 760 torr to less than 2 torr to form the polyethylene terepthalate; and PA1 (d) melt spinning fibers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.