JP2006209097A5 - - Google Patents

Claims (12)

A composition having a dichroic dye having a polymerizable group represented by the general formula (1), or a composition containing a dichroic dye represented by the general formula (2) and a polymerizable compound; A polymer layer obtained by polymerizing the photo-alignment layer (A) having a liquid crystal alignment ability by light irradiation and a liquid crystal compound having a polymerizable group and being aligned by the photo-alignment layer (A). An optical film, wherein a plurality of optically anisotropic layers bonded with (B) by a covalent bond are laminated.

(In the general formula (1), R ¹ and R ² each independently comprise a (meth) acryloyl group, a (meth) acryloyloxy group, a (meth) acrylamide group, a vinyl group, a vinyloxy group, and a maleimide group. Represents a polymerizable group selected from the group;
X ¹ represents a linking group represented by — (A ¹ -B ¹ ) _m —, and X ² represents a linking group represented by — (B ² -A ² ) _n —. Here, A ¹ and A ² are each independently a single bond, an alkylene group having 1 to 20 carbon atoms, a cycloalkylene group having 3 to 20 carbon atoms, or an arylene group having 6 to 20 carbon atoms. To express.
B ¹ and B ² each independently represents a single bond, —O—, —CO—O—, —OCO—, —CONH—, —NHCO—, —NHCO—O—, or —OCONH—. m and n each independently represents an integer of 1 to 4. When m or n is 2 or more, a plurality of A ¹ , B ¹ , A ² and B ² may be the same or different. However, A ¹ or A ² sandwiched between two B ¹ or B ² is not a single bond.
Y represents a group having an azobenzene group, an anthraquinone group, a benzophenone group, a cinnamoyl group, a chalcone group or a coumarin group. )

(In General Formula (2), X ¹ , Y, and X ² represent the same group as the group represented by General Formula (1). R ³ and R ⁴ are each independently a hydrogen atom, Halogen atom, hydroxyl group, nitro group, sulfonic acid group, sulfonate group, halogenated methyl group, cyano group, amino group, formyl group, carboxyl group, piperidino group, and general formula (3)

(Wherein R ⁵ represents a hydrogen atom, an alkyl group, a cycloalkyl group, a phenyl group, a piperidino group; and an alkyl group, a cycloalkyl group, a phenyl group, an alkoxyl group, a cycloalkoxyl group, or a phenoxy group bonded to these groups. Represents one or more groups selected from the group consisting of: The optical film according to claim 1, wherein the photo-alignment layer (A) does not contain a photopolymerization initiator. ^3. The optical film according to claim 1, wherein the dichroic dye having the polymerizable group or the dichroic dye has a mass average molecular weight of 1 × 10 ^{2 to} 5 × 10 ³ . The optical film according to claim 1, further comprising an optically isotropic resin layer between the two adjacent optically anisotropic layers. At least one of the plurality of optically anisotropic layers is a first optically anisotropic layer having a retardation measured at a wavelength of 540 nm of 240 to 300 nm, and at least one of the plurality of optically anisotropic layers. The optical film according to any one of claims 1 to 4, wherein one is a second optically anisotropic layer having a phase difference of 120 to 150 nm measured at a wavelength of 540 nm. The optically anisotropic layer is an optically anisotropic layer having a function of a half-wave plate and an optically anisotropic layer having a function of a quarter-wave plate. Optical film. The optical film according to claim 1, wherein a stacking angle error of the plurality of optically anisotropic layers is within ± 0.1 °. It is a manufacturing method of the optical film in any one of Claims 1-7, Comprising: On the board | substrate, the compound which has a photoalignable group and a polymeric group, or the compound and polymeric compound which have a photoalignable group are contained. And a step a in which a photoalignable polymerizable composition layer not coated with a photopolymerization initiator is applied and dried to form a photoalignable polymerizable composition layer, and polarized light having a wavelength that can be absorbed by the photoalignable group or A step b of irradiating the substrate with non-polarized light from an oblique direction to give liquid crystal alignment ability; a step c of forming a polymerizable liquid crystal composition layer containing a liquid crystal compound having a polymerizable group on the layer; The step (I) including the step (d) of polymerizing the polymerizable groups of the two layers simultaneously with the progress of curing of the two layers by active energy rays or heat is repeated a plurality of times. A method for producing an optical film. The manufacturing method of the optical film of Claim 8 which has the process e of apply | coating and drying an optically isotropic resin layer between the process (I) performed several times. An elliptically polarizing plate comprising the optical film according to claim 1 and a polarizing plate. A circularly polarizing plate comprising the optical film according to claim 1 and a polarizing plate. A liquid crystal display element using the optical film according to claim 1.