Polymerizable compound, polymerizable composition, optical material, optical element and optical head device

A polymerizable compound represented by the following formula (1):

• wherein A is a hydrogen atom or a group selected from the following formulae (2) to (5):
• VwH(3-W)C— (2)
• PhxY(3-x)Si— (3)
• J-(CH2)m1—CHl(CH3)(2-l)— (4)
• J-(CH2)n1—SiPhp1(CH3)(2-p1)— (5);
• B is a group selected from the following formulae (6) and (7):
• J-(CH2)m2—CHk(CH3)(2-k)— (6)
• J-(CH2)n2—SiPhp2(CH3)(2-p2)— (7);
• w is an integer of from 0 to 3;
• V is a methyl group or an ethyl group, provided that when w is from 2 to 3, a plurality of V's may be different groups, x is an integer of from 0 to 3, Y is a group selected from a methyl group, a cyclohexyl group, a tert-butyl group, a sec-butyl group and an isopropyl group, provided that when x is 0 or 1, a plurality of Y's may be different groups, J is a group selected from CH2═CR—COO—, an epoxy group, a vinyl group and a vinyl ether group, R is a hydrogen atom or a methyl group, I is an integer of from 0 to 1, k is an integer of from 0 to 2, provided that when A is a hydrogen atom, k is not 2, each of m1 and m2 which are independent of each other, is from 0 to 12, each of n1 and n2 which are independent of each other, is from 1 to 12, and each of p1 and p2 which are independent of each other, is from 0 to 2;
• provided that some or all of hydrogen atoms in the substituent V in the formula (2), the phenyl group and the substituent Y in the formula (3) and the alkylene group in the formulae (4) to (7) may be substituted by a methyl group, a methoxy group or a fluorine atom, and some or all of hydrogen atoms in the biphenyl group or the biphenylene group may be substituted by a methyl group, a methoxy group or a fluorine atom.