Patent ID: 8653219
Filing Date: 2014-02-18
Classification: C08G

Abstract:
1. Process for preparing a reactive polyurethane composition in the form of a polyurethane hot melt adhesive having a residual monomer content of less than 0.1% by weight, which process comprises: in a first process step, reacting wherein the isocyanate groups of the polyisocyanate are present in a molar deficit relative to the isocyanate-reactive end groups of the polymer or mixture of polymers in a molar ratio of 1:1.1 to 1:5, to produce a monomer-free thermoplastic polyurethane which contains isocyanate-reactive end groups as a first product; and in a second process step, reacting wherein the isocyanate-reactive end groups of the thermoplastic polyurethane first product relative to the isocyanate groups of the prepolymer are present in a molar ratio of 1:1.1 to 1:5, to produce the reactive polyurethane composition.