POLYMERIZABLE LIQUID CRYSTAL COMPOUND, LIQUID CRYSTAL COMPOSITION, OPTICAL ANISOTROPIC MATERIAL AND OPTICAL ELEMENT
申请人:Nagayama Hiromichi
公开号:US20080204650A1
公开(公告)日:2008-08-28
To provide a novel liquid crystal compound for preparing, for example, an optical element which can exhibit a proper Rd value depending upon usable wavelength and application and which is excellent in durability against a blue laser beam.
A liquid crystal compound represented by the formula CH
2
═CR
1
—COO-(L)
k
-E
1
-E
2
-E
3
-E
4
-R
2
wherein R
1
: a hydrogen atom or a methyl group; R
2
: a C
1-8
alkyl group; k:0 or 1; L: —(CH
2
)
p
O— or —(CH
2
)
q
— (wherein each of p and q which are independent of each other, is an integer of from 2 to 8); E
1
: a 1,4-phenylene group; E
2
, E
3
, E
4
: each independently a 1,4-pheneylene group or a trans-1,4-cyclohexylene group and at least one of E
2
and E
3
is a trans-1,4-cyclohexylene group, provided that the 1,4-phenylene group and trans-1,4-cyclohexylene group in E
1
to E
4
, may be such that a hydrogen atom bonded to a carbon atom in each group may be substituted by a fluorine atom, a chlorine atom or a methyl group.