Polyester yarns produced by high speed melt-spinning processes
US4743504A · kind A · utility
7Cited by
2References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 14, 1983 |
| Grant date | May 10, 1988 |
| Priority date | — |
| Expiry date | Sep 14, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2929
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A spun polyester yarn containing ethylene terephthalate as the main or only recurring unit characterized by a percentage crystallinity (.beta..times.10.sup.2) of less than 20, a birefringence (.DELTA.n) of at least 50.times.10.sup.-3, a function A greater than 28 and a function B.gtoreq.16 where ##EQU1## and B=(A-100 .beta.) and wherein-IV is the intrinsic viscosity of the spun yarn, .DELTA.n is the birefringence of the spun yarn and (dpf) is the filament decitex of the spun yarn.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.