Patent ID: 8722191

Claim:
An intermediate layer material comprising a curable resin composition and a fiber base material, to be used to form an intermediate layer of a composite laminate, wherein said curable resin composition contains (a) a curable resin and (b) an inorganic filler comprising talc, containing equal to or more than 60 wt. % and equal to or less than 80 wt. % of said (b) inorganic filler, with respect to an entirety of a solid content in said curable resin composition, wherein a cured material obtained by curing said intermediate layer material at a temperature of 180° C. has such properties as: (i) a planar linear expansion coefficient (α1) equal to or lower than 20 ppm/° C., in a range equal to or higher than 25° C. and equal to or lower than a glass transition temperature (Tg); and (ii) a Barcol hardness equal to or more than 40 and equal to or less than 65, at 25° C., wherein an amount of the talc is being equal to or more than 50 wt. % and equal to or less than 100 wt. % with respect to an entirety of said (b) inorganic filler, and wherein said (a) curable resin contains a bisphenol A epoxy resin, a bisphenol A brominated epoxy resin and a novolak phenolic resin.