Patent ID: 7410673
Filing Date: 2008-08-12
Classification: C08F,C08G,C08L,H01L,H05K,Y10T

Abstract:
1. A process for preparing a smooth board comprising: applying a thermosetting resin composition to a recess on the surface of a substrate; carrying out primary curing of said thermosetting resin composition at a primary curing reaction starting temperature; polishing the surface of said thermosetting resin composition; and carrying out secondary curing of said thermosetting resin composition at a temperature of 150 to 200° C.; wherein said thermosetting resin composition comprises (I) 100 parts by weight of an adduct of an epoxy resin with an unsaturated aliphatic acid, the unsaturated aliphatic acid being added to 20%-80% of epoxy groups in the epoxy resin, (II) 50 to 300 parts by weight of a (meth) acrylate, (III) 5 to 20 parts by weight of a radical polymerization initiator, (IV) 50 to 200 parts by weight of a crystallizable epoxy resin, and (V) 5 to 30 parts by weight of a latent curing agent, capable of a primary curing reaction at the primary curing reaction starting temperature, and a secondary curing reaction at the temperature of 150 to 200° C., wherein the melting point of component (IV) is in a range of 80 to 110° C. which is lower than the primary curing reaction starting temperature and the viscosity of component (IV) when above its melting point is below 50 (mPa·s).