Process for preparing a polyurethane elastic fiber
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United States of America Patent
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Aug 8, 2000
Grant Date -
N/A
app pub date -
May 19, 1999
filing date -
May 19, 1999
priority date (Note) -
Expired
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Abstract
A polyurethane elastic fiber is prepared from a polyurethane prepolymer by reaction extruding the polyurethane prepolymer and a chain extender, preferably with twin-screw extruder, and melt spinning the resulting polyurethane elastomer from the extrusion. The polyurethane prepolymer is obtained by carrying out a pre-polymerization reaction of a polyester diol and a diisocyanate, wherein the polyester diol comprises two different types of polyol, the first type being poly(tetramethylene adipate) glycol or poly(.epsilon.-caprolactone) glycol and the second type being a reaction product of a diol and dicarboxylic acid having 36 carbon atoms.
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