Patent ID: 7931825

Claim:
A polymerizable composition comprising a bifunctional (meth)acrylate compound represented by general formula (1): wherein R 1 and R 2 each independently represent a hydrogen atom or a methyl group; ring A 1 , ring A 2 , and ring A 3 each independently represent a benzene ring, a cyclohexane ring, a cyclohexene ring, a naphthalene ring, a decahydronaphthalene ring, a tetrahydronaphthalene ring, or a phenanthrene ring, the —CH═ moiety of each of the rings being optionally displaced with —N═ or the —CH 2 — moiety of each of the rings being optionally displaced with —S— or —O—; X, Y, and Z each independently represent an optionally substituted alkyl group having 1 to 8 carbon atoms, an optionally substituted acyl group having 1 to 8 carbon atoms, an optionally substituted alkoxy group having 1 to 8 carbon atoms, a halogen atom, or a cyano group, provided that at least one of Y's represents a group composed of at least two atoms except a halogen atom; L 1 , L 2 , L 3 , and L 4 each independently represent a single bond, —COO—, —OCO—, —(CH 2 ) p —, —CH═CH—, —(CH 2 ) p O—, —O(CH 2 ) p —, —CH═CHCH 2 O—, —OCH 2 CH═CH—, —C≡C—, —(CH 2 ) p COO—, —OCO(CH 2 ) p —, —(CH 2 ) p OCO—O—, —OCO—O(CH 2 ) p —, —(CH 2 ) q O(CH 2 ) r O—, or —O (CH 2 ) q O(CH 2 ) r —; a, b, and c each represent the number of the substituents on the rings A 1 , A 2 , and A 3 , respectively, and are each defined to be an integer of 2t+2 or fewer, wherein t is the number of the 6-membered rings making up the monocyclic or fused ring A 1 , A 2 , or A 3 , provided that b is at least 1; each p independently represents an integer of 1 to 8; and q and r each independently represent an integer of 1 to 3, and a monofunctional (meth)acrylate compound having a nitrile group at the terminal thereof represented by general formula (2): wherein R 3 represents a hydrogen atom or a methyl group; ring A 4 and ring A 5 each independently represent a benzene ring, a cyclohexane ring, or a naphthalene ring, the —CH═ moiety of each of the rings being optionally displaced with —N═ or the —CH 2 — moiety of each of the rings being optionally displaced with —S— or —O—; each Q independently represents an optionally substituted alkyl group having 1 to 8 carbon atoms, an optionally substituted acyl group having 1 to 8 carbon atoms, an optionally substituted alkoxy group having 1 to 8 carbon atoms, a halogen atom, or a cyano group; L 5 and L 6 each independently represent —COO—, —OCO—, —(CH 2 ) p —, —CH═CH—, —(CH 2 ) p O—, —O(CH 2 ) p —, —CH═CHCH 2 O—, —OCH 2 CH═CH—, —C≡C—, —(CH 2 ) p COO—, —OCO(CH 2 ) p —, —(CH 2 ) p OCO—O—, —OCO—O(CH 2 ) p —, —(CH 2 ) q O(CH 2 ) r O—, or —O(CH 2 ) q O(CH 2 ) r —; d represents the number of the substituents on the ring A 5 and is defined to be an integer of 2t+2 or fewer, wherein t is the number of the 6-membered rings making up the monocyclic or fused ring; each p independently represents an integer of 1 to 8; and q and r each represent an integer of 1 to 3, at a mass ratio of the former to the latter of 90/10 to 40/60.