Reactive hot melt foam

Details Reactive hot melt foam Reactive hot melt foam

C - Chemistry, Metallurgy

09

J

C09J 5/08 (2006.01) B29B 13/02 (2006.01) C08G 18/20 (2006.01) C08J 9/30 (2006.01) C08L 75/04 (2006.01)

Patent

CA 2169676

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.

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