Patent ID: 6734569
Filing Date: 2004-05-11
Classification: H01L

Abstract:
A photo curable die attach adhesive composition which comprises:1) a resin component comprising: a. an epoxy component including at least one polyepoxide resin curable by heat in an amount of about 25 to about 70% by weight, b. an olefinically unsaturated monomer component including at least one polyolefinically unsaturated monomer curable by actinic radiation in an amount of about 5 to about 30% by weight; and c. at least one cyanate ester in an amount of about 25 to about 50% by weight; 2) at least one photoinitiator in an amount of about 0.1 to about 10% by weight of the resin component; 3) at least one organic peroxide in an amount of about 0.2 to about 2% by weight of the resin component; 4) at least one heat activated curing agent for accelerating reaction of said cyanate ester, epoxy and combination thereof, said heat activated curing agent being selected from the group consisting of organo-metal compounds, inorganic metal salts, phenolic compounds, solutions of organo-metal compounds in phenolic compounds and mixtures thereof in an amount of about 0.01 to about 1.0% by weight of the resin component; and which further contains a filler in an amount of about 40 to about 80% by weight based upon the resin component; wherein said adhesive composition exhibits dual curing characteristics and has a viscosity of about 100 kcps to about 400 kcps.