Polymerizable compound, photocurable composition, optical element and optical head device
View Patent ↗A compound capable of satisfying both high refractive index and high light resistance, and a photocurable composition containing it, are provided. Further, an optical element having good light resistance against blue laser light, and an optical head device using it, are provided. A polymerizable compound represented by SiA 1 A 2 A 3 A 4 wherein silicon and four cyclic groups are bonded directly or via oxygen. each of A 1 , A 2 , A 3 and A 4 which are independent of one another, is —(O) m —X; and each of four m's which are independent of one another, is 0 or 1. X is preferably a phenyl group. From 0 to 3 hydrogen atoms in the phenyl group are substituted by a polymerizable substituent represented by CH 2 ═CR—COO—Y—, and some or all of remaining hydrogen atoms in the phenyl group may be substituted by a methyl group or a fluorine atom.
1. 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.
2. The polymerizable compound according to claim 1 , wherein X is a phenyl group which may have a substituent.
3. The polymerizable compound according to claim 1 , wherein Y is a C 2-12 alkylene or C 2-12 alkyleneoxy group, in which some or all of hydrogen atoms may be substituted by a fluorine atom.
4. The polymerizable compound according to claim 3 , wherein Y is a C 2-12 alkylene group.
5. The polymerizable compound according to claim 3 , wherein Y is a C 2-12 alkyleneoxy group.
6. The polymerizable compound according to claim 1 , wherein the sum in number of substituents represented by the formula (2) in the compound represented by the formula (1) is 1 or 2.
7. The polymerizable compound according to claim 1 , wherein in each of A 1 to A 4 , the cyclic group is a phenyl group which may have a substituent, and m is 0.
8. A photocurable composition containing the polymerizable compound as defined in claim 1 .
9. An optical element using a resin material obtained by curing the photocurable composition as defined in claim 8 .
10. An optical head device using the optical element as defined in claim 9 .