Patent ID: 8211990

Claim:
A polymerizable compound represented by the following formula (1), wherein silicon and four cyclic groups are bonded directly or via oxygen: in the formula (1), each of A 1 , A 2 , A 3 and A 4 which are independent of one another, is —(O) m —X; each of four m's which are independent of one another, is 0 or 1; and each of four X's which are independent of one another, is any cyclic group selected from a phenyl group, a cyclohexyl group, a cyclohexylphenyl group and a phenylcyclohexyl group; and from 1 to 4 hydrogen atoms in total in cyclic groups in A 1 to A 4 are substituted by a substituent represented by the following formula (2), and some or all of remaining hydrogen atoms in each of cyclic groups in A 1 to A 4 may be substituted by a methyl group, a methoxy group, a fluorine atom, a trifluoromethyl group or a trifluoromethoxy group: CH 2 ═CR—COO—Y— (2) in the formula (2), R is a hydrogen atom or a methyl group; and Y is a single bond or an alkylene group; and some or all of hydrogen atoms in the alkylene group may be substituted by a fluorine atom, and the alkylene group may have an oxygen atom in a carbon-carbon bond adjacent thereto or at its terminal bonded to a cyclic group.