Optical material composition and optical material

1. A heat curable optical material composition comprising:

(A) 100 parts by mass of a polymerizable monomer, and

(B) 0.001 to 0.3 parts by mass of a UV absorbent having a maximum absorption wavelength of 360 nm or more and less than 380 nm and represented by the following formula (1):

wherein R 1 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 mono-substituted amino group having 1 to 4 carbon atoms, a linear or branched di-substituted amino group having 1 to 4 carbon atoms, a nitro group, a carboxy group, an alkyloxycarbonyl group in which the alkyl group has 1 to 8 carbon atoms, a hydroxyalkyl group having 1 to 8 carbon atoms, an alkylcarbonyloxyalkyl group in which the alkyl groups each have 1 to 8 carbon atoms, a carboxyalkyl group in which the alkyl group has 1 to 3 carbon atoms, an alkyloxycarbonylalkyl group in which the alkyl groups have 2 to 10 carbon atoms in total, an aryl group, an acyl group, a sulfo group or a cyano group; R 2 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 mono-substituted amino group having 1 to 4 carbon atoms, or a linear or branched di-substituted amino group having 1 to 4 carbon atoms; R 3 represents a hydrogen atom, a hydroxy group, an alkyl group or alkoxy group having 1 to 8 carbon atoms, a linear or branched mono-substituted amino group having 1 to 4 carbon atoms, or a linear or branched di-substituted amino group having 1 to 4 carbon atoms; and R 2 and R 3 may crosslink to form a cyclic structure.

2. The heat curable optical material composition according to claim 1 , wherein the polymerizable monomer (A) contains at least one polyisocyanate compound selected from bis(isocyanatemethyl)bicyclo[2.2.1]heptane, xylylene diisocyanate, diphenylmethane diisocyanate and tolylene diisocyanate, and at least one polythiol compound selected from pentaerythritol tetrakis(3-mercaptopropionate) and 1,2-bis(2-mercaptoethylthio)-3-mercaptopropane.

3. The heat curable optical material composition according to claim 1 , wherein the polymerizable monomer (A) contains bis(2,3-epithiopropyl) disulfide, and a mixture consisting primarily of 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane and 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane.

4. An optical material formed of a cured product produced by polymerizing and curing the heat curable optical material composition of claim 1 , which has a light transmittance at a wavelength of 400 nm of 5% or less, a light transmittance at a wavelength of 420 nm of 70% or less, and a light cut rate in a wavelength range of 380 to 500 nm of 35% or more.

5. A plastic lens formed of the optical material of claim 4 .

6. The heat curable optical material composition according to claim 1 , wherein R 1 represents 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 mono-substituted amino group having 1 to 4 carbon atoms, a linear or branched di-substituted amino group having 1 to 4 carbon atoms, a nitro group, a carboxy group, an alkyloxycarbonyl group in which the alkyl group has 1 to 8 carbon atoms, a hydroxyalkyl group having 1 to 8 carbon atoms, an alkylcarbonyloxyalkyl group in which the alkyl groups each have 1 to 8 carbon atoms, a carboxyalkyl group in which the alkyl group has 1 to 3 carbon atoms, an alkyloxycarbonylalkyl group in which the alkyl groups have 2 to 10 carbon atoms in total, an aryl group, an acyl group, a sulfo group or a cyano group.