Multistage process for producing thermoplastic polyurethane elas

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant having at least one -n=c=x group as well as...

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528 61, 528 65, 528 76, 528 77, 528 80, 528 81, 528 83, 528 85, 528 59, C08G 1810, C08G 1840, C08G 1830

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055457070

ABSTRACT:
Thermoplastically processable polyurethane elastomers are prepared by A) mixing one or more substantially linear polyols with a diisocyanate, B) reacting the resultant mixture substantially completely in a reactor at temperatures of >100.degree. C. to form a prepolymer, C) mixing the prepolymer with low molecular weight chain extenders, D) applying the reaction mixture prepared in stage C) to a support and allowing the mixture to react thereon to solidification.

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