Patent ID: 8604102

Claim:
A thermosetting composition, comprising components (a)-(d): (a) about 1-35 wt % of an oligomer, wherein the oligomer is obtained by reacting a liquid epoxy resin with an aromatic primary amine having four active hydrogen atoms, and the liquid epoxy resin and the primary amine have an equivalent mole ratio of 1:0.15-1:2.50; (b) about 5-10 wt % of a long chain resin; (c) about 50-80 wt % of an epoxy resin having at least two functional groups; and (d) about 5-15 wt % of a plasticizer, wherein the plasticizer comprises urethane acrylate oligomer, polyester acrylate oligomer, phthalate esters or their derivatives and wherein the long chain resin of the component (b) has an average molecular weight of larger than 50,000 and comprises phenoxy epoxy resin, bisphenol A epoxy resin, bisphenol F epoxy resin, bisphenol A/F epoxy resin or their derivatives.