High tenacity, high elongation polypropylene fibers, their manufacture, and use
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United States of America Patent
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Dec 8, 1998
Issued Date -
N/A
app pub date -
May 30, 1996
filing date -
Jun 2, 1995
priority date (Note) -
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Abstract
Spinning polypropylene at relatively high temperatures with delayed quenching, and drawing at relatively high temperatures with moderate draw ratios, provides fibers having an improved tensile factor, especially improved elongation, and can be used to produce fibers also having a high tenacity. The fibers are particularly useful for reinforcement applications when provided in the form of staple fibers and exhibit a tensile factor TE.sup.0.50 of at least about 60, where T is tenacity (gpd) and E is elongation (percent), especially those having a tenacity of at least about 8 gpd and/or an elongation of at least about 25%, and most especially those having a tenacity of at least about 10 gpd and elongations of 50% to 400%.
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