Patent ID: 8066917

Claim:
A photochromic curable composition comprising: [A] not less than 0.1 part and less than 5.0 parts by mass of a radically polymerizable monomer having an epoxy group represented by the following formula (1): wherein R 1 and R 2 are each independently a hydrogen atom or methyl group, R 3 and R 4 are each independently an alkylene group having 1 to 4 carbon atoms which may be substituted by a hydroxyl group, or group represented by the formula and “a” and “b” are each a number of 0 to 20 as an average value; [B] 1.0 to 15.0 parts by mass of a polyfunctional radically polymerizable monomer represented by the following formula (2): wherein R 5 and R 6 are each independently a hydrogen atom or alkyl group having 1 to 2 carbon atoms, R 7 is a trivalent to hexavalent organic group having 1 to 10 carbon atoms, “c” is a number of 0 to 3 as an average value, and “d” is an integer of 3 to 6; [C] 1.0 to 30.0 parts by mass of at least one di(meth)acrylate monomer selected from the group consisting of a di(meth)acrylate monomer represented by the following formula (3), di(meth)acrylate monomer represented by the following formula (4) and urethane di(meth)acrylate monomer having a (meth)acryl equivalent of not less than 600: wherein R 8 and R 9 are each independently a hydrogen atom or methyl group, R 10 and R 11 are each independently a linear or branched alkylene group having 2 to 4 carbon atoms, and “e” and “f” are each an integer including “0”, with the proviso that when R 8 and R 9 are both methyl groups, (e+f) is not less than 7 and less than 15 as an average value, when R 8 is a methyl group and R 9 is a hydrogen atom, (e+f) is not less than 5 and less than 15 as an average value, and when R 8 and R 9 are both hydrogen atoms, (e+f) is not less than 3 and less than 15 as an average value, wherein R 12 and R 13 are each independently a hydrogen atom or methyl group, R 14 and R 15 are each independently a hydrogen atom or methyl group, “A” is a divalent organic group having 1 to 20 carbon atoms, and “g” and “h” are each an integer of not less than 1, with the proviso that when R 12 and R 13 are both methyl groups, (g+h) is not less than 7 and less than 15 as an average value, when R 12 is a methyl group and R 13 is a hydrogen atom, (g+h) is not less than 5 and less than 15 as an average value, and when R 12 and R 13 are both hydrogen atoms, (g+h) is not less than 3 and less than 15 as an average value; [D] more than 50.0 parts and not more than 97.9 parts by mass of a (meth)acrylate monomer except the above components [A] to [C] and/or a thio(meth)acrylate monomer, wherein the total amount of the components [A], [B], [C] and [D] is 100 parts by mass; and [E] 0.001 to 10 parts by mass of a photochromic compound based on 100 parts by mass of the total of all the polymerizable monomers.