Abstract: The present invention provides a curable composition, which contains a crosslinking aid (B) containing three or more allyl groups in the molecule in an amount of 1 to 50 parts by mass, polyfunctional (meth)acrylic compound (C) in an amount of 5 to 50 parts by mass, and photopolymerization initiator (D1) and/or thermal polymerization initiator (D2) in an amount of 0.1 to 10 parts by mass, respectively, as a polymerization initiator (D) to 100 parts by mass of allyl group-terminated allyl ester oligomer (A); wherein the crosslinking aid (B) containing allyl group is a compound containing three or more allyl groups in a molecule; wherein the content of impurities derived from the crosslinking aid (B) in the curable composition is less than 0.1 mass %; wherein the content of the (meth)acrylic compound containing a hydroxyl group in a molecule (C1) in the curable composition is 0.5 to 30 mass %.

Abstract: The present invention provides a curable composition, which contains a crosslinking aid (B) containing three or more allyl groups in the molecule in an amount of 1 to 50 parts by mass, polyfunctional (meth)acrylic compound (C) in an amount of 5 to 50 parts by mass, and photopolymerization initiator (D1) and/or thermal polymerization initiator (D2) in an amount of 0.1 to 10 parts by mass, respectively, as a polymerization initiator (D) to 100 parts by mass of allyl group-terminated allyl ester oligomer (A); wherein the crosslinking aid (B) containing allyl group is a compound containing three or more allyl groups in a molecule; wherein the content of impurities derived from the crosslinking aid (B) in the curable composition is less than 0.1 mass %; wherein the content of the (meth)acrylic compound containing a hydroxyl group in a molecule (C1) in the curable composition is 0.5 to 30 mass %.

Abstract: This invention relates to a transparent composite material having a low linear expansion coefficient and excellent transparency, flexibility and workability, which is formed by curing a resin composition containing epoxy(meth)acrylate synthesized from lactone modified (meth)acrylate, acid anhydride and epoxy resin, in which 10 to 55% by mass of synthetic smectite that is organized with a quaternary ammonium salt and/or a quaternary phosphonium salt and has a number average particle diameter of from 10 to 300 nm and an aspect ratio of from 10 to 300 is dispersed; and a transparent composite sheet using the material.

Abstract: This invention relates to a transparent composite material having a low coefficient of liner thermal expansion and excellent transparency and flexibility, which is formed by curing a resin composition containing urethane (meth)acrylate, in which 10 to 40% by mass of synthetic smectite that is organized with a quaternary ammonium salt and/or a quaternary phosphonium salt and has a number average particle diameter of from 10 to 300 nm and an aspect ratio of from 10 to 300 is dispersed; and a transparent composite sheet using the material.