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1. (WO2001002630) MELT PROCESSABLE, BLEACH RESISTANT, DURABLE FIBERS HAVING HIGH ELASTIC RECOVERY AND LOW STRESS RELAXATION FROM POLYURETHANE ELASTOMERS

Pub. No.:    WO/2001/002630    International Application No.:    PCT/EP2000/006046
Publication Date: Fri Jan 12 00:59:59 CET 2001 International Filing Date: Thu Jun 29 01:59:59 CEST 2000
IPC: D01F 6/70
Applicants: KRATON POLYMERS RESEARCH B.V.
DJIAUW, Lie, Khong
MASSE, Michael, Alan
Inventors: DJIAUW, Lie, Khong
MASSE, Michael, Alan
Title: MELT PROCESSABLE, BLEACH RESISTANT, DURABLE FIBERS HAVING HIGH ELASTIC RECOVERY AND LOW STRESS RELAXATION FROM POLYURETHANE ELASTOMERS
Abstract:
The present invention provides melt processable, bleach resistant durable fibers having an elastic recovery above 50% after extension to 160% elongation and a stress relaxation below 50% after extension to 150% for 30 minutes which are formed from a soft polyurethane elastomer. This elastomer is comprised of (a) from 75 to 90% weight of a polydiene diol having up to about two terminal hydroxyl groups per molecule and a number average molecular weight between 500 and 20,000, (b) from 9 to 25% weight of a diisocyanate, and (c) from 0.8 to 5% weight of a chain extender which is a low molecular weight aliphatic diol, or a mixture of the low molecular weight aliphatic diol and from 0.1 to 4.0 mol% of a diamine wherein the hard segment content of the polyurethane elastomer is from about 10 to about 30% weight. The present invention further provides a polyurethane elastomer.