Patent ID: 9708535
Date: 2017-07-18
CPC Classifications: C08F,C09K,G02F

Claim:
1. A photoalignment layer obtained by exposure to polarized UV radiation, the photoalignment layer comprising a polymer comprising (a) a photochemically isomerizable, photochemically uncrosslinkable segment and (b) a photochemically crosslinkable segment, the polymer comprising a structure represented by general formula (I): (wherein L is a polymerizable group, and Sp is a spacer unit; A is a group selected from the group consisting of: (a) a trans-1,4-cyclohexylene group (wherein one or more non-adjacent methylene groups present in this group are optionally replaced with —O—, —NH—, or —S—) (b) a 1,4-phenylene group (wherein one or more —CH═ groups present in this group are optionally replaced with —N═), and (c) 1,4- cyclohexenylene, 2,5-thiophenylene, 2,5-furanylene, 1,4-bicyclo(2.2.2)octylene, naphthalene-1,4-diyl, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl, and 1,2,3,4-tetrahydronaphthalene-2,6-diyl groups, wherein groups (a), (b), and (c) may each be unsubstituted or have one or more hydrogen atoms replaced with a fluorine atom, a chlorine atom, a cyano group, a methyl group, or a methoxy group; r is 0, 1, or 2, wherein if r is 2, each occurrence of A may be the same or different; X and Y are each independently a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, or an alkyl group of 1 to 20 carbon atoms, wherein any hydrogen atom in the alkyl group is optionally replaced with a fluorine atom, and one or more non-adjacent CH Z is represented by general formula (IIa) or (IIb): (wherein the dashed line is a linkage to a carbon atom to which Z is linked; and R