Composite liquid crystal composition, display element and electric field detector

Patent metadata

Field	Value
Publication number	US-2016298035-A1
Application number	US-201414911893-A
Country	US
Kind code	A1
Filing date	Jul 31, 2014
Priority date	Aug 13, 2013
Publication date	Oct 13, 2016
Grant date	—

Abstract

Provided is a composite liquid crystal composition which contains a liquid crystal compound and a polymerizable compound, has sufficiently high Δn, further has high photostability, and can constitute a liquid crystal device capable of being driven at a low voltage. The composite liquid crystal composition includes, as the liquid crystal compound, a compound having a biphenyl skeleton and two or more compounds represented by Formula (I-a), in which the content of the compound having a biphenyl skeleton is 20% by mass or less of the liquid crystal compounds, and the content of the compound represented by Formula (I-a) in which C 1 represents a 1,4-cyclohexylene group and n 1 is not 0 is 45% by mass or more of the liquid crystal compounds; and as the polymerizable compound, one or more compounds selected from the compounds represented by Formulas (II-a1) and (II-a2) and a compound represented by (II-b), in which the total content of the liquid crystal compounds is 65% to 85% by mass, and the total content of the polymerizable compounds is 15% to 35% by mass.

First claim

1 . A composite liquid crystal composition that contains a liquid crystal compound and a polymerizable compound, the composition comprising:
as the liquid crystal compound, a compound having a: biphenyl skeleton including two or three rings, and two or more compounds represented by General Formula (I-a) shown below other than the compound having a biphenyl skeleton,

wherein R 1 represents an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms, and one or more methylene groups existing in the alkyl group or the alkenyl group may be substituted with an oxygen atom, provided that the oxygen atoms are not directly bonded to each other,
C 1 represents a 1,4-phenylene group, a 1,4-cyclohexylene group, a 1,3-dioxane-2,5-diyl group, a pyran-1,4-diyl group, or an indane-2,5-diyl group, and the 1,4-phenylene group may be unsubstituted or may have one or more of a fluorine atom, a chlorine atom, a methyl group, an methoxy groups, an ethyl group, a trifluoromethyl group and a trifluoromethoxy group as a substituent,
C 2 and C 3 each independently represent a 1,4-phenylene group, a 1,4-cyclohexylene group, a decahydronaphthalene-2,6-diyl group, a
1, 2, 3, 4-tetrahydronaphthalene-2,6-diyl group, a 2,6-naphthylene group, or an indane-2,5-diyl group, and the 1,4-phenylene group, the 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, the 2,6-naphthylene group, or the indane-2,5-diyl group may be unsubstituted or may have one or more of a fluorine atom, a chlorine atom, a methyl group, a methoxy group, an ethyl group, a trifluoromethyl group and a trifluoromethoxy group as a substituent,
Z 1 and Z 2 each independently represent a single bond, —CH 2 CH 2 —, —C≡C—, —CF 2 O—, —COO—, or —OCO—, and, in the case where C 2 and C 3 represent a 1,4phenylene group, Z 2 represents —CH 2 CH 2 —, —C≡C—, —CF 2 O—, —COO—, or —OCO—,
X 1 represents an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, a fluorine atom, a chlorine atom, a trifluoromethyl group, a trifluoromethoxy group, a difluoromethyl group or an isocyanate group, and one or more methylene groups existing in the alkyl group or the alkenyl group may be substituted with an oxygen atom, provided that the oxygen atoms are not directly bonded to each other, and
n 1 represents 0, 1, or 2, provided that, in the case where n 1 is 2, C 1 and Z 1 which exist in a plurality of numbers respectively may be the same as or different from each other),
in which the content of the compound having a biphenyl skeleton is 20% by mass or less with respect to the total content of the liquid crystal compounds, and, with respect to the compounds represented by General Formula (I-a), the content of the compound in which C 1 represents a 1, 4-cyclohexylene group and n 1 is not 0 is 45% by mass or more with respect to the total content of the liquid crystal compounds; and
as the polymerizable compound,
one or more compounds selected from the compounds represented by General Formulas (II-a1) and (II-a2) shown below,

wherein n 2 each independently represent an integer of 3 to 14, and
a compound represented by General Formula (II-b) shown below,

wherein B 1 represents a hydrogen atom or a methyl group,
B 2 represents a single bond or an alkylene group having 1 to 3 carbon atoms, one or more methylene groups existing in the alkylene group may be substituted with an oxygen atom, —CO—, —COO—, or —OCO—, provided that the oxygen atoms are not directly bonded no each other, and one or more hydrogen atoms existing in the alkylene group may be substituted with a fluorine atom, and

B 3 and B 4 each independently represent an alkyl group having 3 to 11 carbon atoms, one or more methylene groups existing in the alkyl group may be substituted with an oxygen atom, —CO—, —COO—, or 13 OCO—, provided that the oxygen atoms are not directly bonded to each other and one or more hydrogen atoms existing in the alkyl group may be substituted with a fluorine atom,
in which the ratio of the content (mass) of the one or more compounds selected from the compounds represented by General Formulas (II-a1) and (II-a2) to the compound represented by General Formula (II-b) is 70:30 to 30:70,
the total content of the liquid crystal compounds being 65% to 85% by mass, and the total content of the polymerizable compounds being 15% to 35% by mass.

2 . A display element provided with a transparent substrate, a transparent electrode, a polymer/liquid crystal composite film, and a transparent substrate in this order,
wherein the transparent electrode is capable of being grounded, and the polymer/liquid crystal composite film is formed by using the composite liquid crystal composition according to claim 1 .

3 . An electric field detector comprising:
an electric field detecting unit provided with a transparent substrate, a transparent electrode, a polymer/liquid crystal composite film, and a transparent substrate in this order, wherein the transparent electrode is capable of being grounded, and the polymer/liquid crystal composite film is formed by using the composite liquid crystal composition according to claim 1 .

Assignees

• Dainippon Ink & Chemicals

Inventors

• Fujisawa Toru

Classifications

• G02F1/13439

  characterised by their electrical, optical, physical properties; materials therefor; method of making · CPC title

• C09K19/322

  Compounds containing a naphthalene ring or a completely or partially hydrogenated naphthalene ring · CPC title

• G02F1/1309

  Repairing; Testing · CPC title

• G02F1/1334

  based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals · CPC title

• C09K19/544 Primary

  as dispersing or encapsulating medium around the liquid crystal · CPC title