Crimped melt-spun copolymer filaments
US5427845A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 8, 1990 |
| Grant date | Jun 27, 1995 |
| Priority date | — |
| Expiry date | Jun 8, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/66
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Melt-spun filaments having a highly crimped configuration which is imparted by differential cooling, nonwoven webs of the crimped melt-spun filaments, and a process of forming a nonwoven web of the crimped filaments are disclosed. The filaments are formed from a random copolymer of propylene and ethylene or an alpha-olefin co-monomer having at least 4 carbon atoms which provides an enhanced response to filament crimping by differential cooling. The random copolymer may contain from about 0.5 to about 10 percent, by weight, of ethylene or an alpha-olefin co-monomer having at least 4 carbon atoms; and from about 99.5 to about 90 percent, by weight, propylene. The alpha-olefin co-monomer having at least 4 carbon atoms may be 1-butene, 4-methyl-1-pentene, 1-hexene, or 1-octene. When differentially cooled and collected into a nonwoven web, the crimped filaments provide a nonwoven web having a combination of softness, low density, high bulk and porosity which are associated with desirable fluid transfer characteristics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.