Cloth prepreg, process for producing the same and reinforcing fabric

Abstract

Disclosed is a prepreg which is suited for preparing honeycomb sandwich panels, by which the formation of pores in the interlayer zones in the cured composite can be reduced. The prepreg of the present invention comprises a resin composition including an epoxy resin, a curing agent and a solid rubber, and a woven fabric made of reinforcing fibers, the meshes of the woven fabric being crushed such that said prepreg has a cover factor K.sub.p of 97-99.9%. Also disclosed is a reinforcing fabric comprising warps and woofs which are multifilament yarns made of carbon fibers, the widths W (mm) and finenesses D (d:denier) of the warp and woof satisfying the equation of: W=k.multidot.(D/.rho.).sup.5/9 (wherein k represents 3.5.times.10.sup.-2 -10.0.times.10.sup.-2 (mm.multidot.d.sup.-5/9) and .rho. represents specific gravity of said carbon fibers), the woven fabric having a cover factor K.sub.c of 90.0-99.8%.

Dependencies are inferred from the claim text.