Liquid crystal compound comprising two condensed and substituted rings
AssigneeFuji Photo Film Co., Ltd.
InventorsHideyuki Nishikawa, Ryo Hamasaki, Atsuhiro Ohkawa
Life of this patent
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Abstract
A new liquid crystal compound comprises two condensed and substituted rings. The ring preferably is a five-membered heterocyclic ring. The heterocyclic ring is preferably condensed with benzene ring or an aromatic six-membered heterocyclic ring. The benzene ring or the aromatic six-membered heterocyclic ring is preferably substituted with a group comprising a cyclic structure and a chain structure. The liquid crystal compound is advantageously used in preparation of a thin phase retarder, such as a wide-ranged λ/4 plate, which gives inverse wavelength distribution. The phase retarder can be easily produced according to a simple process by using the new liquid crystal compound.
Claims19
A liquid crystal compound represented by the following formula (I):
- in which each of MG1 and MG2 is independently a liquid crystal core part which comprises at least 2 and at most 8 cyclic groups and which induces an appearance of liquid crystal phase, and the cyclic groups constituting the liquid crystal core parts may be aromatic rings, aliphatic rings or heterocyclic rings;
- one of the cyclic groups constituting MG1 and MG2 is substituted with L1 and L2, respectively;
- R1, R2, R3 and R4 are flexible substituent groups, dipole-effect groups and hydrogen-bonding groups, and are positioned along the long molecular axes of the liquid crystal core parts and induce an appearance of liquid crystal phase;
- each of L1 and L2 is independently a linking group substituting each of the liquid crystal core parts MG1 and MG2, respectively, and is represented by the following (I)-LA or (I)-LB:
- (I)-LA
- in which * indicates a position where the cyclic group constituting MG1 is substituted;
- # indicates a position where P is connected;
- each of A1, A3 and A4 is independently —O—, —NH—, —S—, —CH2—, —CO—, —SO— or —SO2—;
- and A2 is —CH═ or —N═;
- in the case where L1 and L2 are represented by (I)-LA, the substituent group P is a single bond or a divalent linking group selected from the group consisting of —CH═CH—, —C≡C—, 1,4-phenylene and combinations thereof;
- in the case where either L1 or L2 is represented by (I)-LB, the substituent group P is represented by *═CH—P1-# or *═N—P1-# (in which * indicates a position where the group represented by (I)-LB is connected, and # indicates a position where the group represented by (I)-LA is connected);
- P1 is a single bond or a divalent linking group selected from the group consisting of —CH═CH—, —C≡C—, 1,4-phenylene and combinations thereof;
- in the case where L1 and L2 are represented by (I)-LB, the substituent group P is a double bond or a group represented by ═CH—P1—CH═, ═N—P1—CH═ or ═N—P1—N═;
- and P1 is the same as the above P1.
A liquid crystal compound forming nematic phase or smectic A phase, wherein the liquid crystal phase satisfies the following formula (II):
- Δn(450 nm)/Δn(550 nm)<1.0 (II)
- in which Δn(λ) means the specific birefringent index at the wavelength λ in the liquid crystal phase.
A compound represented by the following formula (III):
- in which each of A11 and A14 is independently —O—, —NR—, —S—, —CR2—, —CO—, —SO— or —SO2—, wherein R is hydrogen, a halogen atom, cyano, an alkyl group having 1 to 10 carbon atoms or an acyl group having 1 to 10 carbon atoms;
- each of A12, A13, A21, A22, A23 and A24 is independently —CR═ or —N═, wherein R is hydrogen, a halogen atom, cyano, an alkyl group having 1 to 10 carbon atoms or an acyl group having 1 to 10 carbon atoms;
- P11 is a single bond or a divalent linking group selected from the group consisting of —CR═CR—, —CR═N—, —N═CR—, —C≡C—, 1,4-phenylene that can be substituted with a halogen atom, cyano, an alkyl group having 1 to 10 carbon atoms or an acyl group having 1 to 10 carbon atoms and combinations thereof, wherein R is hydrogen, a halogen atom, cyano, an alkyl group having 1 to 10 carbon atoms or an acyl group having 1 to 10 carbon atoms;
- each of L21, L22, L23 and L24 is independently a single bond or a divalent linking group;
- each of Cy1, Cy2, Cy3 and Cy4 is independently a divalent cyclic group having at least one aromatic, aliphatic or heterocyclic ring;
- each of L31, L32, L33 and L34 is independently a single bond or a divalent linking group;
- each of Ch1, Ch2, Ch3 and Ch4 is independently a divalent chain group selected from the group consisting of an alkylene group, a substituted alkylene group, an alkenylene group, a substituted alkenylene group, an alkynylene group and a substituted alkynylene group;
- and each of Q21, Q22, Q23 and Q24 is independently hydrogen or a polymerizable group.
Dependencies are inferred from the claim text.