Liquid crystal composition, color filter and optical film

A color filter, comprising a layer having colored areas which are formed to have different selective reflections by irradiating active light rays having different irradiation amounts onto the layer having a liquid crystal composition that includes at least one of compounds represented by the following formula (1) or formula (2) and at least one of chiral compounds that undergo structural changes upon photoreaction:

• wherein, each of R1, R2, R3 and R4 represents at least one monovalent group selected from group 1 which consists of monovalent groups, each of L1 and L2 represents a single bond or at least one divalent group selected from group 2 which consists of divalent groups, each of Ar1, Ar3, Ar4 and Ar6 represents at least one divalent group selected from group 3 which consists of divalent groups, each of Ar2 and Ar5 represents at least one divalent group selected from group 4 which consists of divalent groups, and a carbon ring in groups 3 and 4 which consist of divalent groups may be substituted by at least one of a fluorine atom, a chlorine atom, a bromine atom, —CF3, —OCF3, —OCHF2, —CH3 and —COCH3;
• each of n1, n2, n3 and n4 represents 0 or 1, and n represents any one of integers of 2 to 15 and groups 1,2,3 and 4 are represented as follows:

A color filter, comprising a layer having a red area, a green area and a blue area, the respective areas being formed by irradiating light rays onto a layer having a liquid crystal composition that includes at least one of compounds represented by the following formula (1) or formula (2) and at least one of chiral compounds that undergo structural changes upon photoreaction and showing colors due to circularly polarized reflections caused by helical pitches:

• wherein, each of R1, R2, R3 and R4 represents at least one monovalent group selected from group 1 which consists of monovalent groups, each of L1 and L2 represents a single bond or at least one divalent group selected from group 2 which consists of divalent groups, each of Ar1, Ar3, Ar4 and Ar6 represents at least one divalent group selected from group 3 which consists of divalent groups, each of Ar2 and Ar5 represents at least one divalent group selected from group 4 which consists of divalent groups, and a carbon ring in groups 3 and 4 which consist of divalent groups may be substituted by at least one of a fluorine atom, a chlorine atom, a bromine atom, —CF3, —OCF3, —OCHF2, —CH3 and —COCH3;
• and each of n1, n2, n3 and n4 represents 0 or 1, and n represents any one of integers of 2 to 15 and groups 1,2,3 and 4 are represented as follows:

An optical film, which is formed by irradiating active light rays onto a layer containing a liquid crystal composition that includes at least one of compounds represented by the following formula (1) or formula (2) and at least one of chiral compounds that undergo structural changes upon photoreaction to cause a compound represented by the formula (1) or formula (2) to be polymerized and fixed:

• wherein, each of R1, R2, R3 and R4 represents at least one monovalent group selected from group 1 which consists of monovalent groups, each of L1 and L2 represents a single bond or at least one divalent group selected from group 2 which consists of divalent groups, each of Ar1, Ar3, Ar4 and Ar6 represents at least one divalent group selected from group 3 which consists of divalent groups, each of Ar2 and Ar5 represents at least one divalent group selected from group 4 which consists of divalent groups, and a carbon ring in groups 3 and 4 which consist of divalent groups may be substituted by at least one of a fluorine atom, a chlorine atom, a bromine atom, —CF3, —OCF3, —OCHF2, —CH3 and —COCH3;
• each of n1, n2, n3 and n4 represents 0 or 1, and n represents any one of integers of 2 to 15 and groups 1,2,3 and 4 are as represented as follows: