Liquid crystal composition for light-scattering liquid crystal device, light-scattering liquid crystal device, and smart window

A light-scattering liquid crystal device comprising a liquid crystal layer comprising a polymer network formed by polymerizing a liquid crystal composition, and a pair of alignment films each in direct contact with the liquid crystal layer;

• the composition comprising at least two polymerizable compound selected from the group consisting of compounds represented by following general formula (1) as a first component and comprising a compound having a negative dielectric anisotropy as a second component:
• P1—S1—X1A1-Z1nA2-X2—S2—P2 (1)
• in the formula, P1 and P2 are each independently represented by the following formulae (P-1) to (P-20);
• S1 and S2 each independently represent a linear alkylene group having 2 to 8 carbon atoms, a fluorine-substituted alkylene group having 2 to 6 carbon atoms, an alkylene group having 4 to 14 carbon atoms in which the alkylene group is partially substituted by —O—, or a single bond;
• X1 and X2 each independently represent —O—, —S—, —OCH2—, —CO—, —COO—, —OCO—, —CO—S—, —S—CO—, —O—CO—O—, or a single bond, provided that each P1—(S1—X1)— and each (X2—S2)—P2 bond does not include —O—O—;
• Z1 represents —O—, —S—, —OCH2—, —CH2O—, —CO—, —COO—, —OCO—, —CO—S—, —S—CO—, —O—CO—O—, —SCH2—, —CH2S—, —CF2O—, —OCF2—, —CF2S—, —SCF2—, —CH═CH—COO—, —CH═CH—OCO—, —COO—CH═CH—, —OCO—CH═CH—, —COO—RZ1—, —OCO—RZ1—, —RZ1—COO—, —RZ1—OCO—, —COO—CH2—, —OCO—CH2—, —CH2—COO—, —CH2—OCO—, —CH═CH—, —CH2CH2—, or a single bond, provided that —RZ1— represents an alkylene group having 2 to 6 carbon atoms, and when multiple Z1s are present, Z1s are the same or different provided that at least one of Z1s represents a group selected from the group consisting of —COO— RZ1—, —OCO—RZ1—, —RZ1—COO—;
• A1 and A2 each independently represent a group selected from the following (a) to (c):
• (a) a trans-1.4-cyclohexylene group, one methylene group or two or more non-adjacent methylene groups present in this group may be substituted by —O— or —S—;
• (b) a phenylene group, one —CH═ group or two or more non-adjacent —CH═ groups present in this group may be substituted by a nitrogen atom;
• and
• (c) a cyclohexenylene group, a bicyclo(2.2.2)octylene group, a piperidine group, a naphthalene group, a decahydronaphthalene group, and a tetrahydronaphthalene group,
• wherein one or two or more hydrogen atoms present in the above-mentioned groups (a), (b), (c) may be each independently substituted by a fluorine atom, a chlorine atom, an alkyl group having 1 to 8 carbon atoms, a halogenated alkyl group having 1 to 8 carbon atoms, a halogenated alkoxy group having 1 to 8 carbon atoms, or an alkoxy group having 1 to 8 carbon atoms, and when multiple A1s are present, A1s are the same or different;
• and
• n each independently represents an integer of 2 to 4,
• the composition comprising a polymerizable compound, as a third component, represented by a following general formula (2-ii):
• in the formula, Pii1 represents a polymerizable functional group;
• Rii1 represents a single bond or an alkylene group having 1 to 9 carbon atoms, and one or two or more —CH2— groups in the alkylene group are each independently optionally substituted by —O—, —CO—, —COO—, or —OCO— in such a manner that oxygen atoms are not directly adjacent to each other, and one or two or more hydrogen atoms present in the alkylene group are each independently optionally substituted by a fluorine atom;
• Rii2 and Rii3 each independently represent a hydrogen atom or an alkyl group having 1 to 21 carbon atoms, and one or two or more —CH2— groups in the alkyl group are each independently optionally substituted by —O—, —CO—, —COO—, or —OCO— in such a manner that oxygen atoms are not directly adjacent to each other, and one or two or more hydrogen atoms present in the alkyl group are each independently optionally substituted by Pii2, a fluorine atom, an alkyl group having 1 to 8 carbon atoms, or a halogenated alkyl group having 1 to 8 carbon atoms;
• or
• a polymerizable compound represented by a following general formula (3-i):
• in the formula, Y1 and Y2 each represent a hydrogen atom or a methyl group;
• and
• X1 represents linear or branched alkylene having 6 to 80 carbon atoms, where an arbitrary carbon atom of the alkylene is optionally substituted by —O—, —CH═CH—, —CO—, —C≡C—, —OCO—, —COO—, or OH in such a manner that oxygen atoms are not directly adjacent to each other, and
• wherein a ratio of the first component to a total mass of the first component and the third component is 10% by mass or more and 85% by mass or less, and
• wherein the pair of alignment films are selected from a group consisting of a homeotropic alignment film without rubbing and a homeotropic alignment layer formed by polymerizing a spontaneous vertical alignment monomer.