Patent ID: 6348121
Filing Date: 2002-02-19
Classification: C08G,C09J

Abstract:
A method for bonding a pair of adherends with a curable adhesive composition, which comprises the steps of:(A) providing an isocyanate component; (B) providing a catalyzed component comprising: (1) a hydroxyl functional component; (2) a heat-activatable amine or aza catalyst which is activated at temperatures above a threshold temperature of about 65Â° C., said heat activatable amine or aza catalyst selected from the group consisting of: 1,8-diaza-bicyclo(5,4,0)undecene-7; 1,5-diazabicyclo(5,4,0)undec-5-ene; derivatives and mixtures thereof; and (3) an activatable complexed metal catalyst comprising the reaction product of a metal catalyst selected from the group consisting of tin catalysts, bismuth catalysts, and mixtures thereof, and a molar excess of a mercapto compound complexing agent; (C) admixing said isocyanate component and said catalyzed component to form said curable composition; (D) applying said curable adhesive composition to a bondline intermediate said adherends; and (E) bonding said adherends at said bondline by heating said curable adhesive composition above said threshold temperature to effect its curing by activating said amine or amine-like catalyst and said complexed metal catalyst.