Patent ID: 7923488
Filing Date: 2011-04-12
Classification: C08G,C08L,C09J,H01L,H05K,Y10T

Abstract:
1. A one part epoxy composition, comprising: an epoxy resin; a triarylmethane leuco dye having a functional group on at least one aromatic ring thereof, wherein the functional group is selected from the group consisting of N,N-dialkylamino, N,N-diarylamino, N-alkyl-N-arylamino, N-alkylamino, and N-arylamino; an imidazole-based catalyst, wherein the imidazole-based catalyst is microencapsulated or protected and activated by one of heat, pressure, radiation or a combination thereof; and a urea secondary co-catalyst or co-curing agent having a molecular weight of more than 300 and a functional group selected from the group consisting of N,N-dialkylamino, N,N-diarylamino, N-alkyl-N-arylamino, and dicycloalkylamino; wherein the one part epoxy composition comprises from between about 0.05% to about 15% by weight of the triarylmethane leuco dye and between about 2% to about 40% by weight of the imidazole-based catalyst.