ALLYL-EPOXY-IPN

摘要

The invention pertains to an interpenetrating polymer network (IPN) composed of (1) epoxy network forming compounds comprising: (a) polyfunctional epoxy compounds (epoxy resin); (b) polyfunctional aromatic hydroxyl compounds; (2) allyl network forming compounds; in which the (1):(2) weight ratio is in the range of 95:5 to 40:60, and the epoxy network forming compounds (1a) and (1b) are in a non-stoichiometric ratio to each other, such that the percentage of stoichiometry is in the range of 10 to 80 %. The percentage of stoichiometry is defined as 100 % times the quotient of the number of hydroxyl equivalents and the number of epoxy equivalents, i.e., eq. OH/eq. epoxy x 100 %. Such IPNs are especially suitable for use in the electronics industry and exhibit a favourable, high Tg and a low TCE. This also applies in the case of comparatively high percentages of epoxy resin giving optimum peel strength. The epoxy resin preferably is based on the diglycidyl ether of Bisphenol-A, while the allyl compound is triallyl cyanurate (TAC) or triallyl isocyanurate (TAIC).