Hot-melt bonding process using isocyanate-contg. prepolymers

摘要

A process is claimed for bonding surfaces with NCO gp.-contg. prepolymers (I) based on polyester-diol(s) (II) and di-isocyanate(s) (III), by applying (I) as a hot melt adhesive to at least one of the bonding surfaces. The novelty is that (a) (II) are derived from dodecanedicarboxylic acid (IV) and even-numbered diol(s) with at least 6C atoms, (b) (I) contains not above 1.8 wt.% NCO gps., (c) (I) has Mn at least 4500 and (d) (I) is applied by spin-spraying and the coated surface is then immediately brought into contact with the other surface to form the joint.