Patent ID: 6100360
Filing Date: 2000-08-08
Classification: C08G,Y10S

Abstract:
A process for preparing polyurethane elastic fiber comprising the following steps:preparing a polyurethane prepolymer by conducting a pre-polymerization reaction of a composition comprising a polyester diol and a diisocyanate;preparing a polyurethane elastomer by feeding said polyurethane prepolymer and a chain extender into a twin-screw extruder and reaction extruding said polyurethane prepolymer and said chain extender with said twin-screw extruder; andmelt spinning said polyurethane elastomer to form polyurethane elastic fiber;said process being carried out with the proviso that said polyester diol comprises two different types of diols, type A and type B, wherein type A is poly(tetramethylene adipate)glycol or poly(.epsilon.-caprolactone)glycol, and type B is a reaction product of a diol and dicarboxylic acid having 36 carbon atoms.