Patent ID: 8278401

Claim:
A cationically curable barrier composition consisting essentially of: (a) a meta-substituted aromatic epoxy compound having the general structure: in which R 1 , R 2 , R 3 , R 4 are selected from the group consisting hydrogen, halogen, cyano, alkyl, aryl, and substituted alkyl or aryl groups; R 5 , R 6 are divalent hydrocarbon linkers having the general structure —C n H 2n —, where n=0-4; L 1 , L 2 , L 3 , L 4 , L 5 , L 6 are either a direct bond or a divalent linking group selected from EP is an epoxy group selected from the group consisting of aliphatic epoxy, glycidyl ether, and cycloaliphatic epoxy, in which the hydrogens on any of the epoxy groups is optionally substituted by one or more alkyl or halogen groups: RF is a reactive functionality selected from the groups consisting of EP, an hydroxyl (—OH), a vinyl ether (—O—CH═CH 2 ), a propenyl ether (—O—CH═CH—CH 3 ), a crotyl ether (—O—CH═CH—C 2 H 5 ), a styrenic, an acrylate, a methacrylate, an itaconate, a maleimide, a maleate, a fumarate, a cinnamate, an acrylamide, a methacrylamide, a chalcone, a thiol, an allyl, an alkenyl, and a cycloalkenyl; and (b) a cationic inititiator, and (c) one or more epoxy resins selected from the group consisting of bisphenol F diglycidyl ether, novolac glycidyl ethers, polycyclic epoxies, and halogenated glycidyl ethers.