Unitary spun composite filament
US3940543A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 14, 1973 |
| Grant date | Feb 24, 1976 |
| Priority date | — |
| Expiry date | Aug 14, 1993 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2929
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A novel unitary spun polyester composite filament is provided. The composite filament consists essentially of (a) a block copolymer, as the first component, having a melting point of not lower than 170.degree.C and consisting essentially of 35-80 wt. % of a polyester, as the hard segment, predominantly containing a tetramethylene terephthalate unit and 20-65 wt. % of a long-chain glycol having a molecular weight of 500 to 5,000 as the soft segment, and (b) a polyester, as the second component, predominantly containing a tetramethylene terephthalate unit. The composite filament produces crimps superior particularly in percent of crimp and percent of crimp retentivity when drawn and relaxed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.