Spandex elastomers

Details Spandex elastomers Spandex elastomers

1997-09-08

1998-12-01

Sergent, Rabon

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

2641761, 264205, 528 61, 528 64, 528 76, 528906, D01F 670, D01F 924, D01F 1304, C08G 1848

Patent

active

058433570

ABSTRACT:
Spandex-type segmented polyurethane/urea elastomers having exceptional elongation, hysteresis, recovery, and other physical properties are prepared by the amine chain extension of an isocyanate-terminated prepolymer prepared by the reaction of a stoichiometric excess of isocyanate with a polyol blend comprising a low molecular weight diol having a molecular weight below 750 Da with a high molecular weight glycol which may be a 1500 Da to 20,000 Da molecular weight, ultra-low unsaturation polyoxypropylene glycol with an unsaturation of less than about 0.010 meq/g.

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