Liquid crystal alignment agent for photo-alignment, aligning member, and retardation member
A liquid crystal alignment agent for photo-alignment for providing an aligning member has excellent photoreaction efficiency and is capable of aligning polymerizable liquid crystals with high sensitivity. A liquid crystal alignment agent for photo-alignment includes (A) a resin having a side chain including a structure of Formula (1) and (B) a compound of Formula (2), an alignment member obtained from the liquid crystal alignment agent, and a retardation member: wherein X1 is a benzene ring which may be arbitrarily substituted with an substituent, R is a substituent selected from OH and NH 2 , R 1 , R 2 , R 3 , R 4 and R 5 are each independently a substituent selected from a hydrogen atom, a halogen atom, C 1-6 alkyl, C 1-6 haloalkyl, etc., and n is an integer of 0 or 1.
1. A liquid crystal alignment agent for photo-alignment, the liquid crystal alignment agent containing (A) a resin having a side chain including a structure of Formula (1) below, and (B) a compound of Formula (2) below,
in Formula (1), X 1 is a benzene ring which may be substituted with a substituent, wherein the substituent is one or more of an alkyl group, a haloalkyl group, an alkoxy group, a halogen atom, a cyano group and a nitro group, and R is a substituent selected from OH and NH 2 ;
in Formula (2), any 3-5 of R 1 , R 2 , R 3 , R 4 and R 5 are each independently a substituent selected from a hydrogen atom, a halogen atom, C 1-6 alkyl, C 1-6 haloalkyl, C 3-8 cycloalkyl, C 3-8 halocycloalkyl, C 2-6 alkenyl, C 2-6 haloalkenyl, C 3-8 cycloalkenyl, C 3-8 halocycloalkenyl, C 2-6 alkynyl, C 2-6 haloalkynyl, C 1-6 alkoxy, C 1-6 haloalkoxy, (C 1-6 alkyl)carbonyl, (C 1-6 haloalkyl)carbonyl, (C 1-6 alkoxy)carbonyl, (C 1-6 haloalkoxy)carbonyl, (C 1-6 alkyl)aminocarbonyl, (C 1-6 haloalkyl)aminocarbonyl, di(C 1-6 alkyl)aminocarbonyl, cyano and nitro, and when any 3 or 4 of R 1 , R 2 , R 3 , R 4 and R 5 are as defined above, the remaining one or two of R 1 , R 2 , R 3 , R 4 and R 5 is/are a group of Formula (3) below,
in Formula (3), the dashed line is a bond, R 6 is C 1-30 alkylene, phenylene, or a divalent carbocyclic ring or heterocyclic ring, one or a plurality of hydrogen atoms of the alkylene, phenylene, or divalent carbocyclic ring or heterocyclic ring is optionally substituted with a fluorine atom, and when R 6 is C 1-3 alkylene, —CH 2 CH 2 — of R 6 is optionally replaced by —CH═CH—, —CH 2 — of R 6 is optionally replaced by phenylene or a divalent carbocyclic ring or heterocyclic ring, and is optionally replaced by —O—, —NHCO—, —CONH—, —COO—, —OCO—, —NH—, —NHCONH—, or —CO—, provided these groups are not adjacent to each other, and R 7 is a hydrogen atom or a methyl group, and n is an integer of 0 or 1.
2. The liquid crystal alignment agent for photo-alignment according to claim 1 , wherein the resin of component (A) is an acrylic copolymer.
3. The liquid crystal alignment agent for photo-alignment according to claim 1 , wherein the R in Formula (1) is OH.
4. The liquid crystal alignment agent for photo-alignment according to claim 1 wherein the content of component (B) is 3-100 parts by mass with respect to 100 parts by mass of component (A).
5. An aligning member prepared by using the liquid crystal alignment agent for photo-alignment according to claim 1 .
6. A retardation member formed by using the aligning member according to claim 5 .