REACTIVE POLYURETHANE HOT MELT ADHESIVES WITH A WIDE ADHESION RANGE

摘要

A reactive polyurethane hotmelt based on (A) bifuctional polyisocyanate of isocyanate content 5-50 wt.% based on A, (B) a polyol mixture containing at least one crystallizing polyesterpolyol (b1) based on fumaric acid and 1,6-hexanediol, where the ratio of A to B is selected so that the molar ratio of NCO to OH = 1.2-4.0 is new. An Independent claim is included for preparation of the hotmelt by mixing a liquid polyol B with an excess of polyisocyanate A and filling of the homogeneous mixture obtained or by stirring the mixture to a constant NCO value followed by filling.