Moisture- and heat-crosslinkable polyurethane-based adhesive composition comprising a low content of isocyanate monomer

摘要

The present invention relates to a heat- and moisture-crosslinkable adhesive composition comprising:a) from 40 to 60 wt % of at least one polyurethane obtainable by a polyaddition reaction of at least one particular diisocyanate with at least one polyether diol, with or without the presence of at least one reaction catalyst, at a reaction temperature T1 below 95° C., in anhydrous conditions, and in amounts of diisocyanate(s) and of polyether diol(s) leading to an NCO/OH molar ratio in the range from 1.6 to 1.9;b) from 39 to 59 wt % of at least one compatible tackifying resin andc) from 0.01 to 1 wt % of at least one crosslinking catalyst.;The present invention also relates to a method of preparing said adhesive composition, a self-adhesive support coated with the crosslinked adhesive composition and the use of said support for making labels and/or self-adhesive tapes.