Cinnamic acid derivative, polymer thereof, and liquid crystal alignment layer comprising cured product thereof

A compound represented by the general formula (I):

• (wherein L represents a polymerizable group and Sp1 and Sp2 each represent a spacer unit,
• A01 and A02 each independently represent a group selected from the group consisting of:
• (a) a trans-1,4-cyclohexylene group (one methylene group or two or more non-adjacent methylene groups present in this group may be substituted with —O—, —NH—, or —S—),
• (b) a 1,4-phenylene group (one or two or more —CH═'s present in this group may be substituted with —N═), and
• (c) a 1,4-cyclohexenylene group, a 2,5-thiophenylene group, a 2,5-furanylene group, a 1,4-bicyclo(2.2.2)octylene group, a naphthalene-1,4-diyl group, a naphthalene-2,6-diyl group, a decahydronaphthalene-2,6-diyl group, and a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, in which the group (a), (b), or (c) may be each unsubstituted or may have one or more hydrogen atoms substituted with a fluorine atom, a chlorine atom, a cyano group, a methyl group, or a methoxy group,
• X1, X2, Y1 and Y2 each independently represent a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, or an alkyl group having 1 to 20 carbon atoms, but a hydrogen atom in the alkyl group may be substituted with a fluorine atom, and one CH2 group or two or more non-adjacent CH2 groups may be substituted with —O—, —CO—O—, —O—CO— and/or —CH═CH—,
• Z is represented by the general formula (IIa) or (IIb):
• (in which the dashed line represents a bond to a carbon atom, to which Z is bonded, and
• R1 and R2 each independently represent a hydrogen atom or a linear or branched alkyl group having 1 to 30 carbon atoms, one —CH2— group or two or more non-adjacent —CH2— groups in R1 and R2 may be substituted with —O—, —CO—, —CO—O—, —O—CO—, —CO—NH—, —NH—CO—, —NCH3—, —CH═CH—, —CF═CF—, and/or —C≡C—, one or two or more —CH2— groups in R1 and R2 may be each independently substituted with a cycloalkyl group with a 3- to 8-membered ring, and a hydrogen atom in R1 and R2 may be substituted with an alkyl group having 1 to 20 carbon atoms, a cyano group, or a halogen atom),
• W represents —O— or —NR3—, in which R3 represents a hydrogen atom, a linear or branched alkyl group having 1 to 20 carbon atoms, or a cycloalkyl group with a 3- to 8-membered ring, which may have the alkyl group interposed therein as a linking group, a hydrogen atom in the alkyl group may be unsubstituted or may be substituted with a fluorine atom or a chlorine atom, a hydrogen atom in the cycloalkyl group may be unsubstituted or may be substituted with an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, a fluorine atom, or a chlorine atom, and
• r and t each independently represent 1 or 2).