Composition of epoxy resin, secondary amine-functional adhesion promotor and curative of nitrogen-compound and transition metal complex

摘要

A thermosetting resin is useful as an underfilling sealant form mounting semiconductors onto a printed circuit board and comprises (a) an epoxy resin containing at least one multifunctional epoxy resin, (b) an adhesion promotor having at least two secondary amine groups wherein the weight ratio of epoxy resin:adhesion promotor being from about 2:1 to about 20:1, (c) a curative of a nitrogen-containing compound and a transition metal complex; and, optionally, a polysulfide toughening agent.