Curable resin composition, adhesive composition, cured object or composite

A curable resin composition, consisting essentially of:

• a polymerizable vinyl monomer,
• from 0.1 to 20 parts by mass of an organic peroxide as a curing agent, per 100 parts by mass of the polymerizable vinyl monomer,
• from 0.01 to 2.5 parts by mass of a paraffin, per 100 parts by mass of the polymerizable vinyl monomer,
• from 0.1 to 20 parts by mass of a (meth)acrylic acid, per 100 parts by mass of the polymerizable vinyl monomer,
• from 0.05 to 15 parts by mass of a reducing agent, per 100 parts by mass of the polymerizable vinyl monomer, and
• from 40 to 70 parts by mass of an acrylic block copolymer, per 100 parts by mass of the polymerizable vinyl monomer,
• wherein the acrylic block copolymer has a structure of formula (II):
• [a1]-[b]-[a2] (II)
• wherein
• [a1] is a polymer block consisting of polymethylmethacrylate, and having a glass transition temperature of from 100 to 120° C.;
• [a2] is a polymer block consisting of polymethylmethacrylate, and having a glass transition temperature of from 100 to 120° C.;
• [b] is a polymer block consisting of poly-n-butylacrylate, and having a glass transition temperature of from −50 to −45° C.;
• a ratio of a total mass of [a1] and [a2] to a mass of [b] is 1/1;
• the polymerizable vinyl monomer consists essentially of from 30 to 80 parts by mass of (A) a methylmethacrylate monomer, from 10 to 50 parts by mass of (B) a phenoxyethylmethacrylate monomer and/or a 2-hexylethylmethacrylate monomer, and from 1 to 20 parts by mass of (C) a 2,2-bis(4-(meth)acryloxydiethoxyphenyl)propane monomer and/or an ethylene oxide-modified bisphenol A dimethacrylate monomer;
• and
• the curable resin composition, when cured, has a haze of from 3% to 10%, expressed as a ratio of diffuse transmittance over luminous transmittance.