High tenacity, high modulus polyethylene and polypropylene fibers and intermediates therefore
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United States of America Patent
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Aug 20, 1985
Issued Date -
N/A
app pub date -
Oct 3, 1983
filing date -
Mar 19, 1982
priority date (Note) -
Expired
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Abstract
Solutions of ultrahigh molecular weight polymers such as polyethylene in a relatively nonvolatile 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.
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