REACTIVE HOT MELT FOAM

摘要

A process for foaming polyurethane reactive hot melt adhesive comprising the steps of: a) melting a reactive polyurethane adhesive containing 0.05 to 0.5% by weight of a 2,2'dimorpholinodiethyl ether or di(2,6-dimethylmorpholinodiethyl)ether catalyst in a heated reservoir b) pumping the adhesive from the heated reservoir into a heated reservoir recirculating foaming device; c) foaming the adhesive by injecting therein an effective amount of an anhydrous gas; d) discharging a portion of the foamed adhesive through an orifice onto a substrate to be bonded; and e) recirculating the remaining foamed adhesive back to the foaming device for discharge at a later time.