High tenacity, high modulus polyethylene and polypropylene fibers and intermediates therefore
US4413110A · kind A · utility
334Cited by
1References
19Claims
0Family size
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Key dates
| Filing date | Mar 19, 1982 |
| Grant date | Nov 1, 1983 |
| Priority date | — |
| Expiry date | Mar 19, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S428/902
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Solutions of ultrahigh molecular weight polymers such as polyethylene in a relatively non-volatile solvent are extruded through an aperture at constant concentration through the aperture and cooled to form a first gel of indefinite length. The first gels are extracted with a volatile solvent to form a second gel and the second gel is dried to form a low porosity xerogel. The first gel, second gel or xerogel, or a combination, are stretched. Among the products obtainable are polyethylene fibers of greater than 30 or even 40 g/denier tenacity and of modulus greater than 1000 or even 1600 or 2000 g/denier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.