Patent ID: 7202304
Filing Date: 2007-04-10
Classification: C08G,C08L,C09D,H01L,Y10T

Abstract:
1. An underfill composition comprising: an epoxy resin; and a curing agent selected from the group consisting of low molecular weight maleic anhydride polymers comprising cyclohexane or bridged cyclohexane having the following structural formula, where n is 0, 2 or 3, n′ is 5 to 50, and R is selected from the group consisting of alkyl, aryl, substituted aryls, esters, ethers, lactones, anhydrides, alcohols, nitriles, epoxy, carboxylic acids and mixtures thereof, maleic anhydride polymers comprising norbornene having the following structural formula: where n is 1, n′ is 5 to 50, and R is selected from the group consisting of ethers, lactones, anhydrides, alcohols, nitriles, epoxy, carboxylic acids, and styrene/maleic anhydride polymers having a molecular weight of about 1600 g/mole, and mixtures thereof.