Patent ID: 8420745

Claim:
A thermally curable solder resist composition, comprising: (a) 50-100 parts by weight of an epoxy resin, wherein the epoxy resin comprises at least an aliphatic polyester modified epoxy resin represented by Formula (I) or (II): and wherein each of R 1 and R 2 , independently, is a C 6-38 saturated or an unsaturated carbon chain, R 3 is ether, phenyl, a C 6-38 heterocyclic or C 6-38 saturated carbon chain, n is an integer of 1-10 and the aliphatic polyester modified epoxy resin had a molecular weight of 1000-5000, wherein the aliphatic polyester modified epoxy resin are 30-100 weight % based on the total epoxy resin; (b) 1-10 parts by weight of a curing agent; and (c) 1-10 parts by weight of a catalyst.