Patent ID: 6586526
Filing Date: 2003-07-01
Classification: C08G,C08L,H05K,Y10S,Y10T

Abstract:
A liquid curable resin composition for use as a material for forming a resinous insulating layer in a multilayer printed circuit board, which comprises:(A) epoxy resins; (B) an epoxy resin curing agent; and (C) a rubber component in a proportion of not more than 20 parts by weight, based on 100 parts by weight of said epoxy resins (A), wherein said epoxy resins (A) comprise: (A-1) a bisphenol A epoxy resin having an epoxy equivalent of not less than 400, and (A-2) an epoxy resin having an epoxy equivalent of less than 400 and containing at least two epoxy groups in the molecular unit thereof, the ratio of said epoxy resins (A-1:A-2) being in the range of from 30:70 to 90:10 by weight so that a cured coating film formed of the resin composition is partially decomposed or dissolved with a coarsening agent and consequently endowed with an undulating coarsened surface, said epoxy resin curing agent (B) contains at least two active hydrogen atoms in the molecular unit thereof, and said composition comprises said components (A), (B), and (C) in a liquid, curable, and mixed state.