Patent ID: 8598719
Filing Date: 2013-12-03
Classification: H01L,H05K

Abstract:
1. A semiconductor element mounting board, comprising: a board having surfaces; a semiconductor element provided at a side of one of the surfaces of the board; a bonding agent layer through which the board and the semiconductor element are bonded together, the bonding agent layer having a storage modulus at 25° C. of 5 to 1,000 MPa; a first layer into which the semiconductor element is embedded, the first layer provided on the one surface of the board; a second layer provided on the other surface of the board; and surface layers provided on the first and second layers, respectively, each of the surface layers being formed from at least a single layer, wherein a coefficient of thermal expansion of each surface layer in an inplane direction thereof measured based on JIS C 6481 at a temperature of 20° C. to a glass-transition temperature Tg wherein the bonding agent layer is formed of a bonding agent, and the bonding agent comprises a resin composition containing (meth)acrylate copolymer, epoxy resin, phenol resin and an inorganic filler, wherein an amount by weight of the (meth)acrylate copolymer contained in the resin composition is lower than a total amount by weight of the epoxy resin and the phenol resin contained in the resin composition, and wherein the (meth)acrylate copolymer is an acrylic acid copolymer obtained by polymerizing monomers each having an epoxy group, a hydroxyl group, a carboxyl group or a nitrile group.