Method for producing polyurethane elastomer fibers and fibers produced according to this method
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Nov 26, 2002
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N/A
app pub date -
Jul 19, 2000
filing date -
Dec 10, 1997
priority date (Note) -
Expired
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Abstract
Polyurethane elastomer fibers with superior mechanical and heat distortion properties are obtained by a method in which (a) a segmented polyurethane polymer is produced on the basis of a macro-diol, an aliphatic diisocyanate, and a chain extender with at least two hydroxy and/or amino groups, where the polymer has a molar excess of isocyanate groups over the hydroxy and/or amino groups from the macro-diol and chain extender; (b) the polyurethane polymer is melt-extruded to form a fiber; and (c) The extruded fiber is subjected to a post-treatment. Steps (a) and (b) are carried out under temperature conditions and within a time interval where essentially no allophanate will be formed, while step (c) is performed under temperature conditions and within a time interval in which the polyurethane polymer is cross-linked through the formation of allophanate.
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