Low molecular weight polar compound for homogeneously aligning liquid crystal medium, and liquid crystal medium containing same
AssigneesJnc Corporation, Jnc Petrochemical Corporation
InventorsTomohiro Yano, Fumitaka Kondou, Shin-ichi Yamamoto
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Abstract
A liquid crystal composition without requiring an alignment film or alignment treatment on a substrate. The problem is solved by a low molecular weight polar compound capable of homogeneously aligning a liquid crystal medium relative to the substrate, for example, a low molecular weight polar compound represented by formula (1): M-P (1) In formula (1), M is a nonpolar group having 1 or more carbons, and P is a polar group.
Claims12
A liquid crystal medium-sealed between a pair of substrates subjected to neither alignment treatment nor an alignment film and having a transparent electrode formed on at least one of the substrates, wherein the liquid crystal medium contains a low molecular weight polar compound for homogeneously aligning the liquid crystal medium relative to the substrate, so that the homogeneous alignment of the liquid crystal medium relative to the substrate occurs spontaneously,
- wherein the low molecular weight polar compound is represented by formula (2) or (3):
- wherein, in formulas (2) and (3),
- R4 is hydrogen, halogen or alkyl having 1 to 20 carbons, and in R4, at least one —CH2— may be independently replaced by —O— or —S—, and at least one —(CH2)2— may be replaced by —CH═CH—, and in the groups, at least one hydrogen may be replaced by halogen,
- P1, P2, P3 and P4 are independently a group represented by formula (Q-0) or straight-chain, branched-chain or cyclic alkyl having 1 to 25 carbons, and in P1, P2, P3 and P4, at least one —CH2— nonadjacent to each other may be independently replaced by —N(—P0)—, —O—, —S—, —CO—, —CO—O—, —O—CO— or —O—CO—O— in such a manner that N, O and/or S atoms are not directly connected to each other, at least one tertiary carbon (CH group) may be replaced by N, at least one hydrogen may be independently replaced by F or Cl, and at least one —(CH2)2— may be independently replaced by —CH═CH— in which P1, P2, P3 and P4 contain one or more heteroatoms selected from N, S and/or O, and
- P0 is independently straight-chain, branched-chain or cyclic alkyl having 1 to 25 carbons, and in P0, at least one —CH2— nonadjacent to each other may be independently replaced by —N(—P0)—, —O—, —S—, —CO—, —CO—O—, —O—CO— or —O—CO—O— in such a manner that N, O and/or S atoms are not directly connected to each other, at least one tertiary carbon (CH group) may be replaced by N, at least one hydrogen may be independently replaced by F or Cl, and at least one —(CH2)2— may be independently replaced by —CH═CH— or —C≡C—, in which P0 contains one or more heteroatoms selected from N, S and/or O, and
- in formula (Q-0), R1, R2 and R3 are independently hydrogen, halogen or alkyl having 1 to 20 carbons, and in R1, R2 and R3, at least one —CH2— may be independently replaced by —O— or —S—, and at least one —(CH2)2— may be replaced by —CH═CH—, and in the groups, at least one hydrogen may be replaced by halogen.
A liquid crystal composition containing at least one low molecular weight polar compound represented by formula (2) or (3):
- wherein, in formulas (2) and (3),
- R4 is hydrogen, halogen or alkyl having 1 to 20 carbons, and in R4, at least one —CH2— may be independently replaced by —O— or —S—, and at least one —(CH2)2— may be replaced by —CH═CH—, and in the groups, at least one hydrogen may be replaced by halogen,
- P1, P2, P3 and P4 are independently a group represented by formula (Q-0) or straight-chain, branched-chain or cyclic alkyl having 1 to 25 carbons, and in P1, P2, P3 and P4, at least one —CH2— nonadjacent to each other may be independently replaced by —N(—P0)—, —O—, —S—, —CO—, —CO—O—, —O—CO— or —O—CO—O— in such a manner that N, O and/or S atoms are not directly connected to each other, at least one tertiary carbon (CH group) may be replaced by N, at least one hydrogen may be independently replaced by F or Cl, and at least one —(CH2)2— may be independently replaced by —CH═CH— or —C≡C—, in which P1, P2, P3 and P4 contain one or more heteroatoms selected from N, S and/or O, and
- P3 is independently straight-chain, branched-chain or cyclic alkyl having 1 to 25 carbons, and in P0, at least one —CH2— nonadjacent to each other may be independently replaced by —N(—P0)—, —O—, —S—, —CO—, —CO—O—, —O—CO— or —O—CO—O— in such a manner that N, O and of S atoms are not directly connected to each other, at least one tertiary carbon (CH group) may be replaced by N, at least one hydrogen may be independently replaced by F or Cl, and at least one —(CH2)2— may be independently replaced by —CH═CH— or —C≡C—, in which P0 contains one or more heteroatoms selected from N, S and/or O, and
- in formula (Q-0), R1, R2 and R3 are independently hydrogen, halogen or alkyl having 1 to 20 carbons, and in R1, R2 and R3, at least one —CH2— may be independently replaced by —O— or —S—, and at least one —(CH2)2— may be replaced by —CH═CH—, and in the groups, at least one hydrogen may be replaced by halogen.
Dependencies are inferred from the claim text.