Active energy ray-curable composition and lens sheet

A backlight, comprising a lens sheet which comprises a transparent substrate and a lens section having a refractive index of 1.60 or greater, wherein the lens section is formed on the transparent substrate from an active energy ray-curable composition, wherein the active energy ray-curable composition comprises:

• (A) 20 to 80 parts by weight of a compound represented by the following general formula I:
• wherein R1 represents hydrogen or methyl, X and Y may be the same or different and represent methyl, chlorine, bromine or iodine, and t and u each independently represent an integer of 0-2,
• (B-1) 10 to 90 parts by weight of at least one compound having at least two acryloyl or methacryloyl groups in the molecule,
• (B-2) 1 to 90 parts by weight of at least one monoacrylate or monomethacrylate compound having one acryloyl or methacryloyl group in the molecule, and
• (C) 0.01 to 5 parts by weight of an active energy ray-sensitive radical polymerization initiator with respect to 100 parts by weight of the total of said components (A), (B-1) and (B-2).

A backlight, comprising a lens sheet which comprises a transparent substrate and a lens section having a refractive index of 1.60 or greater, wherein the lens section is formed on the transparent substrate from an active energy ray-curable composition;

• wherein the active energy ray-curable composition comprises:
• (A) 20 to 80 parts by weight of a compound represented by the following general formula I:
• wherein R1 represents hydrogen or methyl, X and Y may be the same or different and represent methyl, chlorine, bromine or iodine, and t and u each independently represent an integer of 0-2,
• (B-1) 10 to 90 parts by weight of at least one compound having at least two acryloyl or methacryloyl groups in the molecule,
• (B-2) 1 to 90 parts by weight of at least one monoacrylate or monomethacrylate compound having one acryloyl or methacryloyl group in the molecule, and
• (C) 0.01 to 5 parts by weight of an active energy ray-sensitive radical polymerization initiator with respect to 100 parts by weight of the total of said components (A), (B-1) and (B-2);
• and
• wherein the compound having at least two acryloyl or methacryloyl groups in the molecule, which constitutes said component (B-1), is selected from compounds represented by the following general formula II:
• wherein R2 represents hydrogen or methyl, V and W may be the same or different and represent methyl, chlorine, bromine or iodine, p and q each independently represent an integer of 0-2, R3 represents
• m and n represent integers of 0-5, and z represents

A backlight, comprising a lens sheet which comprises a transparent substrate and a lens section having a refractive index of 1.60 or greater, wherein the lens section is formed on the transparent substrate from an active energy ray-curable composition;

• wherein the active energy ray-curable composition comprises:
• (A) 20 to 80 parts by weight of a compound represented by the following general formula I:
• wherein R1 represents hydrogen or methyl, X and Y may be the same or different and represent methyl, chlorine, bromine or iodine, and t and u each independently represent an integer of 0-2,
• (B-1) 10 to 90 parts by weight of at least one compound having at least two acryloyl or methacryloyl groups in the molecule,
• (B-2) 1 to 90 parts by weight of at least one monoacrylate or monomethacrylate compound having one acryloyl or methacryloyl group in the molecule, and
• (C) 0.01 to 5 parts by weight of an active energy ray-sensitive radical polymerization initiator with respect to 100 parts by weight of the total of said components (A), (B-1) and (B-2);
• and
• wherein the compound having at least two acryloyl or methacryloyl groups in the molecule, which constitutes said component (B-1), is selected from the group consisting of 2,2-bis(4-methacryloyloxyethoxyphenyl)-propane, 2,2-bis(4-acryloyloxyethoxyphenyl)-propane, 2,2-bis(4-methacryloyloxydiethoxyphenyl)-propane, 2,2-bis(4-acryloyloxydiethoxyphenyl)-propane, 2,2-bis(4-methacryloyloxytriethoxyphenyl)-propane, 2,2-bis(4-acryloyloxytriethoxyphenyl)-propane, 2,2-bis(4-methacryloyloxytetraethoxyphenyl)-propane, 2,2-bis(4-acryloyloxytetraethoxyphenyl)-propane, 2,2-bis(4-methacryloyloxypentaethoxyphenyl)-propane and 2,2-bis(4-acryloyloxypentaethoxyphenyl)-propane.