Hot-Melt Polyurethane Reactive Adhesives Targeted for Specific Applications
What are hot-melt polyurethane reactive adhesives used for?
The advantages of HMPUR adhesives result from the properties that were described above. Some of these advantages are:
HMPUR adhesives are manufactured by reacting mixtures of polyols with an excess of diisocyanate. The reaction of an isocyanate group (-NCO) with an alcohol group (-OH) produces the urethane group, as shown in Figure 1. The fact that there are excess diisocyanates present means that the molecular weight of the resulting product is not too high and that the HMPUR product will have a controlled melt viscosity.