Curable composition for optical materials, and optical material

A photo curable composition for an optical material, comprising:

• (A) 100 parts by mass of a radical polymerizable monomer;
• (B) 0.1 to 5 parts by mass of a benzotriazole-based ultraviolet absorber represented by the following formula (1), which has a maximum absorption wavelength of 360 nm or more and less than 380 nm and an absolute value of the difference in solubility parameter (SP value) from the radical polymerizable monomer (A) of 5.5 (cal/cm3)1/2 or less;
• (C) 1 to 5 parts by mass of an ultraviolet absorber which is at least one selected from a benzotriazole compound, a benzophenone compound and a triazine compound and has a maximum absorption wavelength of less than 360 nm;
• and
• (D) 0.05 to 0.5 parts by mass of a radical polymerization initiator:
• wherein R1 represents a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, a hydroxy group, a linear or branched monosubstituted amino group having 1 to 4 carbon atoms, a linear or branched disubstituted amino group having 1 to 4 carbon atoms, a nitro group, a carboxy group, an alkyloxycarbonyl group having 1 to 8 carbon atoms in the alkyl group, a hydroxyalkyl group having 1 to 8 carbon atoms, an alkylcarbonyloxyalkyl group having 1 to 8 carbon atoms in each alkyl group, a carboxyalkyl group having 1 to 3 carbon atoms in the alkyl group, an alkyloxycarbonylalkyl group in which the total number of carbon atoms in the alkyl group is 2 to 10, an aryl group, an acyl group, a sulfo group, or a cyano group;
• R2 represents a hydroxy group, an alkoxy group having 1 to 8 carbon atoms, an alkylthio group having 1 to 8 carbon atoms, a linear or branched monosubstituted amino group having 1 to 4 carbon atoms, or a linear or branched disubstituted amino group having 1 to 4 carbon atoms;
• and R3 represents a hydrogen atom, a hydroxy group, an alkyl or alkoxy group having 1 to 8 carbon atoms, a linear or branched monosubstituted amino group having 1 to 4 carbon atoms, or a linear or branched disubstituted amino group having 1 to 4 carbon atoms, and may be a cyclic structure in which R2 and R3 are crosslinked.