Patent ID: 8058565
Filing Date: 2011-11-15
Classification: H01L,H05K,Y10T

Abstract:
1. A wiring board in which a plurality of wiring layers composed of wiring and an insulating material are layered, said wiring board characterized in that said insulating material for forming said wiring layers disposed on a surface electrically connected to an external element is formed of a material comprising a reactive elastomer (A), an epoxy resin (B), and an epoxy resin curing agent (C), wherein the value (A×100)/(A+B+C) is 50 mass % or higher and less than 100 mass %, where A is the content of the reactive elastomer, B is the content of the epoxy resin, and C is the content of the epoxy resin curing agent, said insulating material having a Young's modulus of 1 GPa or lower in a temperature range of 10 to 30° C. and an elongation at break of 50% or higher.