KR20060051530A - Retardation plate - Google Patents

Abstract

(Problem) The liquid crystal material excellent in the wavelength dispersion characteristic is provided. Moreover, this invention provides the phase difference plate which, when used for a liquid crystal display device, has little color change of a display image and contributes to expansion of a viewing angle.

(Solution means) A retardation plate having an optically anisotropic layer formed of a disc-shaped compound, wherein the maximum absorption wavelength of the at least one disc-shaped compound in the chloroform solution is 270 nm or less.

Retarder

Description

Phase difference plate {RETARDATION PLATE}

1 is an absorption spectrum of a chloroform solution of exemplary compound (Z4)-(Y1-3) synthesized in Example 1. FIG.

FIG. 2 is a graph plotting the values of maximum absorption wavelength and wavelength dispersion for each exemplary compound synthesized in the Example. FIG.

[Non-Patent Document 1] Molecular Crystals and Liquid Crystals, 84, 193 pages (1982)

[Non-Patent Document 2] Physical properties of liquid crystalline materials (1980 by Gordon and Breach, Science Publishers)

[Patent Document 1] Japanese Unexamined Patent Publication No. Hei 8-50206

[Patent Document 2] Japanese Patent Application Laid-Open No. 7-306317

[Patent Document 3] Japanese Patent Application Laid-Open No. 9-104866

[Patent Document 4] Japanese Unexamined Patent Publication No. 2001-166147

The present invention relates to a retardation plate having an optically anisotropic layer formed from a discotic compound.

An optically anisotropic layer is formed by orienting discotic liquid crystalline molecules (discotic liquid crystalline molecules) and fixing the alignment state. Discotic liquid crystalline molecules generally have a large birefringence. And discotic liquid crystalline molecules have various orientation forms. By using discotic liquid crystalline molecules, it becomes possible to manufacture an optical compensation sheet having optical properties that cannot be obtained with a conventional stretched birefringent film. Non-Patent Document 1 discloses a triphenylene disc-like liquid crystalline molecule having a negative birefringence. In order to use this liquid crystalline molecule for an optical compensation sheet, it is necessary to uniformly orient the whole molecule which comprises an optically anisotropic layer. That is, the discotic liquid crystalline molecules are preferably oriented in the mono domain. However, since the conventional discotic liquid crystalline molecules are dual domain oriented, an alignment defect occurs at the boundary of the domain. Therefore, in the case of conventional discotic liquid crystalline molecules, there are many cases in which optical properties that can be used for an optical compensation sheet cannot be obtained. The optical properties depend on the chemical structure of the discotic liquid crystalline molecules. Therefore, in order to obtain the required optical properties, many kinds of discotic liquid crystalline molecules have been researched and developed. For example, in patent document 1, it is proposed to use the optical compensation sheet which has an optically anisotropic layer containing discotic liquid crystalline molecules on a transparent support body.

Moreover, each publication of patent document 2 and patent document 3 has 2,3,6,7,10,11-hexa {4- (6 as discotic liquid crystalline molecules suitable for formation of the optically anisotropic layer of an optical compensation sheet. -Acryloyloxyhexyloxy) benzoyloxy} triphenylene is disclosed. By the way, the color change in the color display at the time of using an optical compensation sheet for a liquid crystal display device changes large by wavelength dispersion of the retardation value of an optical compensation sheet. The wavelength dispersion, which is an optical property, depends on the molecular structure of the discotic liquid crystal compound. For example, Patent Document 4 discloses a discotic liquid crystal having large refractive index anisotropy, but the wavelength dispersion characteristic is deteriorated, that is, the wavelength Dispersibility became large and performance improvement was inadequate.

In addition, the disk-shaped liquid crystal phase includes a columnar phase in which the central cores of the discotic molecules are stacked in a columnar phase with intermolecular force, a discotic nematic phase (ND phase) in which discotic molecules are coarsely aggregated, and It is known that a chiral disk-shaped nematic phase can be roughly classified. However, as described in Non Patent Literature 2, columnar nematic phases are frequently found, but discotic nematic phases are rarely found.

An object of the present invention is to provide a retardation plate having excellent wavelength dispersion characteristics. Moreover, this invention makes it a subject to provide the phase difference plate which, when used for a liquid crystal display device, has little color change of a display image and contributes to expansion of a viewing angle.

(Means to solve the task)

Means for solving the above problems are as follows.

(1) A retardation plate having an optically anisotropic layer formed from a disc-shaped compound, wherein at least one kind of the disc-shaped compound is a disc-shaped compound having a maximum absorption wavelength of 270 nm or less in a chloroform solution.

(2) The retardation plate of (1) in which the disc-shaped compound exhibits liquid crystallinity.

(3) The retardation plate of (1) or (2) in which the disc-shaped compound expresses a discotic nematic phase.

(4) The phase difference plate in any one of (1)-(3) which has an optically anisotropic layer formed by fixing the said disk shaped compound in the orientation state which shows a discotic nematic phase.

(Embodiment of the Invention)

EMBODIMENT OF THE INVENTION Below, the content of this invention is demonstrated in detail. In addition, in this specification, "-" is used by the meaning which includes the numerical value described before and after that as a lower limit and an upper limit.

The retardation plate of the present invention has an optically anisotropic layer formed from a disk-shaped compound, and at least one of the disk-shaped compounds has a maximum absorption wavelength of 270 nm or less in a chloroform solution. By using the disk shaped compound of such a characteristic, the optically anisotropic layer excellent in the wavelength dispersion characteristic (namely, optical characteristics, such as retardation, is hard to change depending on a wavelength) can be formed.

Moreover, chloroform is used as a solvent because it is a solvent with high solubility of the disk compound which is a solute, and is low in polarity, and does not have an absorption peak in the vicinity of the said absorption peak of a disk compound.

In addition, in this specification, "it has a maximum absorption wavelength in 270 nm or less" means that the absorption peak with the largest absorbance appears in wavelength 270 nm or less among the absorption peaks represented by 240 nm or more. The absorbance of the absorption peak does not have to be the maximum in relation to the absorption peak appearing in the wavelength range of 240 nm or less, but needs to be the maximum in relation to the absorption peak in the wavelength range of 240 nm or more.

The compound represented by the following general formula (A) is mentioned as an example of the disk shaped compound whose maximum absorption wavelength in chloroform solution is 270 nm or less.

In formula, Z is a disc shaped core, Y is a substituent, n is an integer of 2-12. Two or more Y may be same or different, and if possible, may form the ring.

In said formula, the disk shaped core represented by Z is located in the center of the disk shaped compound, and comprises the disk surface. Discoid core is a well-known concept in the molecular structure of discotic liquid crystalline molecules. Discotic liquid crystals are described in several publications (C. Destrade et al., Mol. Crysr. Liq. Cryst., Vol. 71, page 111 (1981); Japanese Chemical Sculpture, Quarterly Chemistry Summary, No. 22). , Chemistry of Liquid Crystals, Chapter 5, Chapter 10, Section 2 (1994); B. Kohne et al, Angew, Chem. Soc.Chem. Comm., Page 1794 (1985); J. Zhang et al., J Am. Chem. Soc., Vol. 116, page 2655 (1994) and the like.

Below, the example of disk shaped core Z is shown. Y in each compound means the same substituent as Y in the said General formula (A).

Disk-shaped core (Z) may have substituents other than Y. Examples of the substituent that the disk-shaped core may have include halogen atoms (fluorine atoms, chlorine atoms, bromine atoms, iodine atoms), cyano groups, hydroxyl groups, amino groups, carbamoyl groups, sulfamoyl groups, mercapto groups, and ureido groups , Alkyl group, substituted alkyl group, alkenyl group, substituted alkenyl group, alkynyl group, substituted alkynyl group, aryl group, substituted aryl group, heterocyclic group, alkoxy group, substituted alkoxy group, aryloxy group, substituted aryloxy group, acyl group, acyl Oxy group, alkoxycarbonyl group, substituted alkoxycarbonyl group, aryloxycarbonyl group, substituted aryloxycarbonyl group, substituted amino group, amide group, imide group, alkoxycarbonylamino group, substituted alkoxycarbonylamino group, aryloxycarbonylamino group, substituted aryloxycarbonyl Amino group, substituted carbamoyl group, sulfonamide group, substituted sulfamoyl group, alkylthio group, substituted alkylthio group, arylthio group, substituted arylthio group, Kylsulfonyl group, substituted alkylsulfonyl group, arylsulfonyl group, substituted arylsulfonyl group, alkylsulfinyl group, substituted alkylsulfinyl group, arylsulfinyl group, substituted arylsulfinyl group, substituted ureido group, phosphate amide group, substituted silyl group, alkoxycar A carbonyloxy group, a substituted alkoxycarbonyloxy group, an aryloxycarbonyloxy group and a substituted aryloxycarbonyloxy group.

The alkyl group may have a cyclic structure or a branched structure. It is preferable that carbon number of an alkyl group is 1-30. The alkyl part of a substituted alkyl group is synonymous with an alkyl group, and its preferable range is also the same meaning. Examples of the substituent of the substituted alkyl group have the same meanings as the examples of the substituent of the disc-shaped core except that the alkyl group, substituted alkyl group, alkenyl group, substituted alkenyl group, alkynyl group and substituted alkynyl group are excluded, and the preferred range is also the same meaning.

The alkenyl group may have a cyclic structure or a branched structure. It is preferable that carbon number of an alkenyl group is 2-30. The alkenyl portion of the substituted alkenyl group has the same meaning as the alkenyl group, and the preferred range also has the same meaning. Examples of the substituent of the substituted alkenyl group are the same as those of the substituent of the substituted alkyl group. The alkynyl group may have a cyclic structure or a branched structure. It is preferable that the number of carbon atoms of an alkynyl group is 2-30. The alkynyl moiety of the substituted alkynyl group is the same as the alkynyl group. Examples of the substituent of the substituted alkynyl group have the same meanings as those of the substituent of the substituted alkyl group, and the preferred ranges have the same meaning.

It is preferable that the number of carbon atoms of an aryl group is 6-30. The aryl part of a substituted aryl group has the same meaning as an aryl group, and its preferable range is also the same meaning. The example of the substituent of a substituted aryl group is synonymous with the example of the substituent of a disk-shaped core, and its preferable range is also the same meaning.

The heterocyclic group preferably has a 5- or 6-membered heterocycle. Other heterocycles, aliphatic rings or aromatic rings may be condensed on the heterocycles. It is preferable that the hetero atom of a heterocycle is a nitrogen atom, an oxygen atom, or a sulfur atom. The heterocyclic group may have a substituent. The example of the substituent of a heterocyclic group is synonymous with the example of the substituent of a disk shaped core, and its preferable range is also the same meaning.

The alkyl part of an alkoxy group and a substituted alkoxy group is synonymous with an alkyl group, and its preferable range is also the same meaning. The example of the substituent of a substituted alkoxy group is synonymous with the example of the substituent of a substituted alkyl group, and its preferable range is also the same meaning. The aryl part of an aryloxy group and a substituted aryloxy group has the same meaning as an aryl group, and its preferable range is also the same meaning. The example of the substituent of a substituted aryloxy group is synonymous with the example of the substituent of a disk-shaped core, and its preferable range is also the same meaning.

The acyl group is represented by formyl or -CO-R, and R is an alkyl group, a substituted alkyl group, an alkenyl group, a substituted alkenyl group, an alkynyl group, a substituted alkynyl group, an aryl group or a substituted aryl group.

The acyloxy group is represented by formyloxy or -O-CO-R, and R is an alkyl group, substituted alkyl group, alkenyl group, substituted alkenyl group, alkynyl group, substituted alkynyl group, aryl group or substituted aryl group.

The alkyl moiety of the alkoxycarbonyl group and the substituted alkoxycarbonyl group has the same meaning as the alkyl group. The example of the substituent of a substituted alkoxycarbonyl group is synonymous with the example of the substituent of a substituted alkyl group, and its preferable range is also the same meaning.

The aryl moiety of an aryloxycarbonyl group and a substituted aryloxycarbonyl group is synonymous with an aryl group, and its preferable range is also the same meaning. The example of the substituent of a substituted aryloxycarbonyl group is synonymous with the example of the substituent of a disk-shaped core, and its preferable range is also the same meaning.

The substituted amino group is represented by -NH-R or -N (-R) ₂ , and R is an alkyl group, substituted alkyl group, alkenyl group, substituted alkenyl group, alkynyl group, substituted alkynyl group, aryl group or substituted aryl group.

The amide group is represented by -NH-CO-R, and R is an alkyl group, a substituted alkyl group, an alkenyl group, a substituted alkenyl group, an alkynyl group, a substituted alkynyl group, an aryl group or a substituted aryl group.

The imide group is represented by -N (-CO-R) ₂ , and R is an alkyl group, a substituted alkyl group, an alkenyl group, a substituted alkenyl group, an alkynyl group, a substituted alkynyl group, an aryl group or a substituted aryl group.

The alkyl portion of the alkoxycarbonylamino group and the substituted alkoxycarbonylamino group have the same meaning as the alkyl group, and the preferred range is also the same meaning. Examples of the substituent of the substituted alkoxycarbonylamino group are the same as those of the substituent of the substituted alkyl group.

The aryl moiety of the aryloxycarbonylamino group and the substituted aryloxycarbonylamino group has the same meaning as the aryl group, and the preferred range is also the same meaning. Examples of the substituent of the substituted aryloxycarbonylamino group are the same as those of the substituent of the disc shaped core.

Substituted carbamoyl groups are represented by -CO-NH-R or -CO-N (-R) ₂ , R is an alkyl group, substituted alkyl group, alkenyl group, substituted alkenyl group, alkynyl group, substituted alkynyl group, aryl group or substituted It is an aryl group.

The sulfonamide group is represented by -NH-SO ₂ -R, and R is an alkyl group, a substituted alkyl group, an alkenyl group, a substituted alkenyl group, an alkynyl group, a substituted alkynyl group, an aryl group or a substituted aryl group. Substituted sulfamoyl group is represented by -SO ₂ -NH-R or -SO ₂ -N (-R) ₂ , R is an alkyl group, substituted alkyl group, alkenyl group, substituted alkenyl group, alkynyl group, substituted alkynyl group, aryl group Or a substituted aryl group.

The alkyl portion of the alkylthio group and the substituted alkylthio group are the same as the alkyl group. Examples of the substituent of the substituted alkylthio group are the same as those of the substituent of the substituted alkyl group.

The aryl moiety of an arylthio group and a substituted arylthio group is synonymous with an aryl group, and its preferable range is also the same meaning. The example of the substituent of a substituted arylthio group is synonymous with the example of the substituent of a disk-shaped core, and its preferable range is also the same meaning.

The alkyl moiety of the alkylsulfonyl group and the substituted alkylsulfonyl group has the same meaning as the alkyl group, and the preferred range is also the same meaning. The example of the substituent of a substituted alkylsulfonyl group is synonymous with the example of the substituent of a substituted alkyl group, and its preferable range is also the same meaning.

The aryl moiety of an arylsulfonyl group and substituted arylsulfonyl group has the same meaning as an aryl group, and its preferable range is also the same meaning. The example of the substituent of a substituted arylsulfonyl group is synonymous with the example of the substituent of a disc shaped core, and its preferable range is also the same meaning.

The alkyl moiety of the alkylsulfinyl group and the substituted alkylsulfinyl group has the same meaning as the alkyl group, and the preferred range is also the same meaning. The example of the substituent of a substituted alkylsulfinyl group is synonymous with the example of the substituent of a substituted alkyl group, and its preferable range is also the same meaning.

The aryl moiety of the alkylsulfinyl group and the substituted alkylsulfinyl group has the same meaning as the aryl group, and the preferred range is also the same meaning. The example of the substituent of a substituted alkylsulfinyl group is synonymous with the example of the substituent of a disk-shaped core, and its preferable range is also the same meaning.

Substituted ureido groups are represented by -NH-CO-NH-R or -NH-CO-N (-R) ₂ , R is an alkyl group, a substituted alkyl group, an alkenyl group, a substituted alkenyl group, an alkynyl group, a substituted alkynyl group, an aryl Group or a substituted aryl group.

The phosphate amide group is represented by -NH-OP (= O) (-OH) -OR or -NH-OP (= O) (-OR) ₂ , and R is an alkyl group, a substituted alkyl group, an alkenyl group, a substituted alkenyl group or an alkoxy group. Or an aryl group, a substituted alkynyl group, an aryl group, or a substituted aryl group.

Substituted silyl groups are represented by -SiH ₂ -R, -SiH (-R) ₂ or -Si (-R) ₃ , R is an alkyl group, substituted alkyl group, alkenyl group, substituted alkenyl group, alkynyl group, substituted alkynyl group, aryl Group or a substituted aryl group.

 The alkyl portion of the alkoxycarbonyloxy group and substituted alkoxycarbonyloxy group is the same as the alkyl group. The example of the substituent of a substituted alkoxycarbonyloxy group is synonymous with the example of the substituent of a substituted alkyl group, and its preferable range is also the same meaning.

The aryl moiety of an aryloxycarbonyloxy group and a substituted aryloxycarbonyloxy group has the same meaning as an aryl group, and its preferable range is also the same meaning. The example of the substituent of a substituted aryloxycarbonyloxy group is synonymous with the example of the substituent of a disk-shaped core, and its preferable range is also the same meaning.

Y in the said general formula (A) represents a substituent. When several Y exists, they may be same or different, respectively. As an example of Y, the example of the substituent which the disk shaped core (Z) may have is mentioned.

Although the example of a preferable Y is shown below, the compound used for this invention is not limited to these.

In said formula, R <^1> , R <^2> , R <^3> , R <^4> and R <^5> may respectively represent a hydrogen atom or a substituent, may combine with each other, and may form the ring. R ⁶ represents a hydrogen atom or a substituent. R ⁷ and R ⁸ each represent a hydrogen atom or a substituent (but not an aryl group). Although R <^6> and R <^7> or R <^6> and R <^8> may connect and form a ring, it does not form a benzene ring. R ⁹ represents a substituent. R ¹⁰ , R ^11, and R ¹² each represent a hydrogen atom or a substituent (but not an aryl group), and the sum of the Hammet (σm) values and (σp) values of each of R ¹⁰ , R ¹¹ and R ¹² is -0.10 or more and 1.50 or less. m is an integer in any one of 1-5. R <^13> represents a substituent and when two or more exist, they may be same or different, but the Hammet ((sigma) p) value of at least 1 R <^13> is 0 or more.

The sigma m value and the sigma p value represent the substituent constants of the Hammet, and the details thereof are as described in page 95 of the Chemical Substance Enhancement 122, Correlation of Structural Activity of Drugs (Nankodo, 1979).

As an example of the substituent of R <^1> -R <^13> , the example of the substituent which the disk shaped core mentioned above may have is mentioned.

Although the specific example of preferable Y is shown below, the compound used for this invention is not limited to these.

Although it is preferable that it is a disk shaped compound which combined the said disk shaped core (Z) and substituent (Y) independently in this invention, if it is a disk shaped compound whose maximum absorption wavelength in a chloroform solution is 270 nm or less, it will not be restrict | limited.

As a more preferable example of the said disc shaped compound, the combination of the said disc shaped core (D) and a substituent (Y) is a disc shaped core (Z4), (Y1-1)-(Y1-78), (Y2-1) Compound combining a substituent selected from-(Y2-53), (Y3-1)-(Y3-30) and (Y4-1)-(Y4-16), and disk-shaped core (Z16) and (Y5 It is a compound which combined the substituent chosen from -1)-(Y5-227).

Moreover, as an example of a preferable disk shaped compound, the disk shaped core (Z4) which does not have a substituent other than Y, and Y on the 2,3,6,7,10,11 of the core are the same substituent, The substituent is ( Y1-1 to Y1-78), (Y2-1) to (Y2-53), (Y3-1) to (Y3-30), (Y4-1) to (Y4-16), and A disk in which a disk-shaped core (Z16) having no substituent other than Y and Y in positions 1, 3, and 5 of the core are all the same substituents, and the substituents are selected from (Y5-1) to (Y5-227). to be. Moreover, the exemplary compound of the more preferable disk-shaped compound shown here is represented by (Z)-(Y) in the combination of disk-shaped core (D) and substituent (Y), as shown to the following example, and an exemplary compound (( Z)-(Y)).

In this invention, 1 type of disc shaped compounds whose maximum absorption wavelength in a chloroform solution is 270 nm or less may be used individually, or may be used in mixture with another disc shaped compound. In addition, although the disk shaped compound does not need to be a liquid crystalline compound, it is preferable that it is a compound which shows liquid crystallinity. In addition, although it is preferable that liquid crystallinity is represented by a single compound, you may show liquid crystallinity by mixing with another compound.

When using the compound disclosed by this invention in mixture with another disk shaped compound, 1-100 mass% is preferable, as for the ratio with respect to the whole molecule of the disk shaped compound which concerns on this invention, 10-98 mass% is more preferable, 30-95 mass% is the most preferable.

[Optical anisotropic layer]

When a discotic compound having a maximum absorption wavelength of 270 nm or less in the chloroform solution disclosed in the present invention exhibits liquid crystallinity, either alone or in combination with another discotic compound, the optically anisotropic material in which the discotic compound is oriented is a retardation plate (or It can be used as an optically anisotropic layer of an optical compensation sheet). The optically anisotropic layer exhibits optical anisotropy based on the orientation of the discotic compound.

The optically anisotropic layer may be formed from a composition containing other materials, such as a material contributing to control the orientation and a material contributing to fixing the orientation state, together with the disk-shaped compound of the present invention. The disk-shaped compound according to the present invention can be immobilized without damaging the alignment form in the liquid crystal state by heating it to the liquid crystal phase formation temperature once and then cooling it while maintaining the alignment state. Moreover, the disk-shaped compound which concerns on this invention can also be immobilized by heating a composition which added the polymerization initiator to liquid crystal phase formation temperature, superposing | polymerizing and cooling. In the present invention, the state in which the orientation state is immobilized is a state in which the orientation is maintained, which is the most typical and preferred embodiment. However, the state is not limited thereto. Specifically, 0 ° C to 50 ° C, and -30 under more severe conditions. In the temperature range of 70 degreeC-70 degreeC, it is a state which does not have fluidity in the layer, and can maintain the fixed orientation form stably without making a change in orientation form by exterior and external force.

Moreover, when an orientation state is finally fixed, it is not necessary for a liquid crystal composition to show liquid crystal already. For example, when a polymeric compound is used as a liquid crystal compound, polymerization or a crosslinking reaction may advance by reaction with heat, light, etc., and high molecular weight may lose liquid crystallinity as a result.

[Phase plate]

The retardation plate of the present invention has an optically anisotropic layer formed from the disc-shaped compound. That is, it means that the said disk shaped compound is used as a raw material of an optically anisotropic layer. For example, when an optically anisotropic layer is produced using the disc-shaped compound having a polymerizable group, the compound is polymerized alone or with another compound in the production process, and finally the compound of the present invention is polymerized. Although the optically anisotropic layer containing the said polymer is produced, such an optically anisotropic layer is also included in the scope of the present invention.

One aspect of the retardation plate of this invention has a transparent support body and the optically anisotropic layer formed from the said disk shaped compound. Here, an optically anisotropic layer can be produced by apply | coating on the alignment film the composition containing the said disk shaped compound and another additive as needed, and fixing it to the orientation state of a liquid crystal state as mentioned above. After the liquid crystal molecules are fixed in the alignment state on the alignment film, they can be transferred onto another support. The liquid crystal compound fixed in the alignment state can maintain the alignment state even without the alignment film. Therefore, the retardation plate may not have an alignment film. It is preferable that the thickness of the said optically anisotropic layer is 0.1-20 micrometers, It is more preferable that it is 0.2-15 micrometers, It is most preferable that it is 0.5-10 micrometers.

[Additive of optically anisotropic layer]

As an example of the additive which can be added to a disk shaped compound in formation of an optically anisotropic layer, an air interface orientation control agent, anti-fogging agent, a polymerization initiator, a polymerizable monomer, etc. are mentioned.

[Air Interface Orientation Control Agent]

The liquid crystal compound is oriented at the pretilt angle of the air interface at the air interface. This pretilt angle means the angle which a disk liquid crystal and an air interface make. Since this pretilt angle changes with the kind of compound, it is necessary to control the pretilt angle of an air interface arbitrarily according to the objective.

For the control of the pretilt angle, for example, an exterior such as an electric field or a magnetic field or an additive can be used, but an additive is preferably used.

As such an additive, a compound having one or more substituted or unsubstituted aliphatic groups having 6 to 40 carbon atoms or substituted or unsubstituted aliphatic substituted oligosiloxaneoxy groups having 6 to 40 carbon atoms in the molecule is preferable. The compound which has two or more is more preferable. For example, the hydrophobic exclusion volume effect compound of Unexamined-Japanese-Patent No. 2002-20363 can be used as an air interface orientation control agent.

As addition amount of the orientation control additive on an air interface side, 0.001 mass%-20 mass% are preferable with respect to a disk shaped compound, 0.01 mass%-10 mass% are more preferable, 0.1 mass%-5 mass% are the most preferable. Do.

[Prevention agent]

In general, a high molecular compound can be preferably used as a material for addition to the disk-shaped compound and to prevent spoiling during application of the composition. There is no restriction | limiting in particular as a polymer to be used, unless the inclination angle change and orientation of a disk shaped compound are remarkably inhibited.

Examples of the polymers are described in Japanese Patent Application Laid-Open No. Hei 8-95030, and cellulose esters are mentioned as specific polymer examples. Examples of cellulose esters include cellulose acetate, cellulose acetate propionate, hydroxypropyl cellulose and cellulose acetate butyrate. In order not to inhibit the orientation of the disk-shaped compound, the amount of the polymer used for the purpose of anti-spatter is generally in the range of 0.1 to 10% by mass and more preferably in the range of 0.1 to 8% by mass with respect to the disk-shaped compound. It is more preferable to exist in the range of 0.1-5 mass%.

[Polymerization Initiator]

In the present invention, it is preferable that the liquid crystalline compound is fixed in a mono domain orientation, that is, in a substantially uniformly oriented state. Therefore, when the polymerizable disc-shaped compound is used, the disc-shaped compound is fixed by a polymerization reaction. It is desirable to. Although the polymerization reaction includes a thermal polymerization reaction using a thermal polymerization initiator, a photopolymerization reaction using a photopolymerization initiator and a polymerization reaction by electron beam irradiation, the photopolymerization reaction and electron beam irradiation may also be used to prevent deformation of the support or the like by heat. The polymerization reaction by is preferred. Examples of photopolymerization initiators include α-carbonyl compounds (see US Pat. No. 23,67661, 2367670), acyloinether (described in US Pat. No. 2448828), α-hydrocarbon substituted aromatic acyl compounds (US Pat. No. 2722512). ), Polynuclear quinone compounds (see US Pat. No. 3046127, US Pat. No. 2951758), combination of triarylimidazole dimers with p-aminophenylketone (described in US Pat. No. 3549367), Acry Dine and phenazine compounds (Japanese Patent Laid-Open No. 60-105667, described in US Pat. No. 4,239,850), and oxadiazole compounds (described in US Pat. No. 4,212,970). It is preferable that it is 0.01-20 mass% of solid content of a coating liquid, and, as for the usage-amount of a photoinitiator, it is more preferable that it is 0.5-5 mass%. It is preferable to use ultraviolet rays for light irradiation for polymerization of the discotic compound. The irradiation energy is preferably 10 mJ to 50 J / cm 2, more preferably 50 mJ to 800 mJ / cm 2. In order to accelerate the photopolymerization reaction, light irradiation may be performed under heating conditions. In addition, since the oxygen concentration in the atmosphere is involved in the degree of polymerization, when the desired degree of polymerization is not reached in air, it is preferable to lower the oxygen concentration by a method such as nitrogen substitution. As a preferable oxygen concentration, 10% or less is preferable, 7% or less is more preferable, and 3% or less is the most preferable.

[Polymerizable Monomer]

You may add a polymerizable monomer to the liquid crystal composition used in order to form an optically anisotropic layer. The polymerizable monomer used together with the liquid crystalline compound is not particularly limited as long as it has compatibility with the liquid crystalline compound and does not significantly cause inclination angle change or orientation inhibition of the liquid crystalline compound. In these, the compound which has a polymerization activity ethylenically unsaturated group, for example, a vinyl group, a vinyloxy group, an acryloyl group, a methacryloyl group, etc. is used preferably. It is preferable that the addition amount of the said polymerizable monomer is generally in the range of 0.5-50 mass% with respect to a liquid crystalline compound, and exists in the range of 1-30 mass%. Moreover, since the effect of improving the adhesiveness between an oriented film and an optically anisotropic layer can be anticipated when using the monomer with 2 or more reactive functional groups, it is especially preferable.

[Application solvent]

As a solvent used for preparation of a liquid crystal composition, an organic solvent is used preferably. Examples of organic solvents include amides (eg N, N-dimethylformamide), sulfoxides (eg dimethyl sulfoxide), heterocyclic compounds (eg pyridine), hydrocarbons (eg toluene, hexane), alkyl halides (eg , Chloroform, dichloromethane), esters (e.g. methyl acetate, butyl acetate), ketones (e.g. acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone), ethers (e.g. tetrahydrofuran, 1,2- Dimethoxyethane). Alkyl halides, esters and ketones are preferred. You may use together 2 or more types of organic solvents.

[Application method]

An optically anisotropic layer is formed by preparing the coating liquid of a liquid crystal composition using the said solvent, apply | coating on an orientation film, and orientation-processing a disc shaped compound. Application of the coating liquid can be carried out by a known method (for example, wire bar coating method, extrusion coating method, direct gravure coating method, reverse gravure coating method, die coating method).

[Alignment Film]

The alignment film is an organic compound (e.g., ω-trichoic acid, by rubbing treatment of an organic compound (preferably a polymer), evaporation of an inorganic compound, formation of a layer having a micro group, or by a Langmuir blowjet method (LB film), It can be formed by means such as accumulation of methyl stearyl acid). Moreover, the orientation film which an orientation function produces by provision of an electric field, provision of a magnetic field, or light irradiation is also known.

Any layer may be used as the alignment film as long as it can provide a desired alignment to the disc-shaped compound of the optically anisotropic layer formed on the alignment film. In the present invention, an alignment film formed by rubbing treatment or light irradiation is preferable. In particular, an alignment film formed by a rubbing treatment of a polymer is particularly preferable. In general, the rubbing treatment can be carried out by rubbing the surface of the polymer layer several times with a paper or cloth in a certain direction. Particularly, in the present invention, the rubbing treatment is carried out by the method described in the liquid crystal handbook (Maruzen). desirable. It is preferable that it is 0.01-10 micrometers, and, as for the thickness of an oriented film, it is more preferable that it is 0.05-3 micrometers.

Moreover, after orienting a rod-shaped liquid crystalline compound using an oriented film, you may fix an rod-shaped liquid crystalline compound in the orientation state, and form an optically anisotropic layer, and only an optically anisotropic layer may be transferred on a polymer film (or a transparent support body). The fixed rod-like liquid crystalline compound in the alignment state can maintain the alignment state even without the alignment film. Therefore, in the retardation plate, the alignment film is not essential (although necessary for the production of the retardation plate).

In order to orient the disk-shaped compound, a polymer (usually an alignment polymer) for controlling the surface energy of the alignment film is used. As for the kind of the specific polymer, various documents have been described regarding the liquid crystal cell or the optical compensation sheet. Also in any orientation film, it is preferable to have a polymeric group for the purpose of improving the adhesiveness of a disk shaped compound and a transparent support body. The polymerizable group introduces a repeating unit having a polymerizable group in the side chain, or may be introduced as a substituent for a cyclic group. It is preferable to use the alignment film which forms a chemical bond with a liquid crystalline compound at an interface, and it is described in Unexamined-Japanese-Patent No. 9-152509 as such an alignment film.

[Rubber Density of Oriented Film]

Since the rubbing density is increased between the rubbing density of the alignment film and the pretilt angle of the disc-shaped compound at the interface of the alignment film, the pretilt angle becomes smaller when the rubbing density is lowered, so that the pretilt angle becomes larger. By changing, the pretilt angle can be adjusted. As a method of changing the rubbing density of an oriented film, the method described in the "liquid crystal handbook" liquid crystal handbook editing committee edition (Maruzen, 2000) can be used. The rubbing density (L) is quantified by the formula (A).

Formula (A) L = Nl {1+ (2πrn / 60v)}

In the formula (A), N is the number of rubbing, l is the contact length of the rubbing roller, r is the radius of the roller, n is the rotation speed (rpm) of the roller, and v is the stage moving speed (second speed). In order to increase the rubbing density, the contact length of the rubbing roller which increases the number of rubbings is increased, the radius of the roller is increased, the number of rotations of the roller is increased, and the stage moving speed is slowed. do.

[Transparent support]

The retardation plate may have a support, and the support is preferably a transparent support. The support is mainly optically isotropic, and if the light transmittance is 80% or more, the material is not particularly limited, but a polymer film is preferable. Specific examples of the polymer include cellulose esters (eg, cellulose diacetate, cellulose triacetate), norbornene-based polymers, films of poly (meth) acrylate esters, and the like. Most commercially available polymers are preferable. It is possible to use. Among these, cellulose esters are preferable from a viewpoint of optical performance, and the lower fatty acid ester of cellulose is more preferable. Lower fatty acids are fatty acids having 6 or less carbon atoms, and preferably 2, 3 or 4 carbon atoms. Specific examples thereof include cellulose acetate, cellulose propionate or cellulose butyrate. Among these, cellulose triacetate is especially preferable. Mixed fatty acid esters such as cellulose acetate propionate and cellulose acetate butyrate may be used. Moreover, even if it is a polymer which birefringence is easy to express like conventionally known polycarbonate and polysulfone, what reduced the expressability by modifying the molecule | numerator described in the international publication WO00 / 26705 pamphlet can also be used.

Hereinafter, the cellulose ester used preferably as a transparent support body is explained in full detail.

It is preferable to use cellulose acetate whose acetylation degree is 55.0-62.5% as a cellulose ester. In particular, the degree of acetylation is preferably 57.0 to 62.0%. The degree of acetylation means the amount of bound acetic acid per cellulose unit mass. The degree of acetylation depends on the measurement and calculation of the degree of acetylation in ASTM: D-817-91 (test methods such as cellulose acetate). It is preferable that it is 250 or more, and, as for the viscosity average polymerization degree (DP) of a cellulose ester, it is more preferable that it is 290 or more. Moreover, it is preferable that the cellulose ester used for this invention has a narrow molecular weight distribution of Mw / Mn (Mw is mass mean molecular weight, Mn is number average molecular weight) by a gel permeation chromatography. As a specific value of Mw / Mn, it is preferable that it is 1.0-1.7, It is more preferable that it is 1.3-1.65, It is most preferable that it is 1.4-1.6.

In cellulose ester, the 2nd, 3rd, and 6th position hydroxyl groups of cellulose are not distributed evenly by 1/3 of the total substitution degree, but there exists a tendency for substitution degree of a 6th position hydroxyl group to become small. The substitution degree of the 6th-position hydroxyl group of a cellulose is more preferable compared with 2nd and 3rd positions. It is preferable that the hydroxyl group at the 6th position is substituted with an acyl group at 30% to 40% with respect to the total degree of substitution, and more preferably at least 31%, particularly at least 32%. It is preferable that the substitution degree of 6 is 0.88 or more. The 6-position hydroxyl group may be substituted with an acyl group having 3 or more carbon atoms (eg, propionyl, butyryl, valeroyl, benzoyl, acryloyl) in addition to the acetyl group. The measurement of the substitution degree of each position can be calculated | required by NMR. The cellulose ester with a high degree of substitution of a 6-position hydroxyl group is the synthesis example 1 of Paragraph No. 0043-0044 of Unexamined-Japanese-Patent No. 11-5851, the synthesis example 2 of Paragraph No. 0048-0049, and the synthesis of Paragraph No. 0051-00052. Synthesis can be carried out with reference to the method of Example 3.

In order to adjust a retardation value, the polymer film used as a transparent support body, especially a cellulose acetate film, can also use the aromatic compound which has at least 2 aromatic ring as a retardation increasing agent. When using such a retardation increasing agent, a retardation increasing agent is used in 0.01-20 mass parts with respect to 100 mass parts of cellulose acetate. It is preferable to use it in the range of 0.05-15 mass parts with respect to 100 mass parts of cellulose acetate, and it is more preferable to use it in the range of 0.1-10 mass parts. You may use together 2 or more aromatic compounds. The aromatic ring of the aromatic compound is added to the aromatic hydrocarbon ring and includes an aromatic hetero ring.

It is particularly preferable that the aromatic hydrocarbon ring is a 6-membered ring (that is, a benzene ring). Aromatic heterocycles are generally unsaturated heterocycles. It is preferable that an aromatic heterocyclic ring is a 5-membered ring, a 6-membered ring, or a 7-membered ring, and it is more preferable that it is a 5-membered ring or a 6-membered ring. Aromatic heterocycles generally have the largest number of double bonds. As a hetero atom, a nitrogen atom, an oxygen atom, and a sulfur atom are preferable, and a nitrogen atom is especially preferable. Examples of aromatic hetero rings include furan ring, thiophene ring, pyrrole ring, oxazole ring, isoxazole ring, thiazole ring, isothiazole ring, imidazole ring, pyrazole ring, furazane ring, triazole ring, pyran ring, pyridine ring and pyri Polyazine ring, pyrimidine ring, pyrazine ring and 1,3,5-triazine ring. As aromatic ring, benzene ring, furan ring, thiophene ring, pyrrole ring, oxazole ring, thiazole ring, imidazole ring, triazole ring, pyridine ring, pyrimidine ring, pyrazine ring and 1,3,5-triazine ring are preferable. And a benzene ring and a 1,3,5-triazine ring are more preferable. It is particularly preferable that the aromatic compound has at least one 1,3,5-triazine ring.

It is preferable that the number of the aromatic rings which an aromatic compound has is 2-20, It is more preferable that it is 2-12, It is further more preferable that it is 2-8, It is most preferable that it is 2-6. The bonding relationship between two aromatic rings can be classified into (a) forming a condensed ring, (b) directly connecting to a single bond, and (c) bonding through a linking group (because of aromatic rings, spiro bonds are formed). Can not). The coupling relationship may be any of (a) to (c). Such retardation synergists are described in International Publication WO01 / 88574 pamphlet, International Publication WO00 / 2619 pamphlet, Japanese Patent Application Laid-Open No. 2000-111914, Japanese Patent Application No. 2000-275434, Japanese Patent Application No. 2002-70009, and the like. have.

It is preferable to manufacture a cellulose acetate film by the solvent cast method from the prepared cellulose acetate solution (dope). You may add the said retardation increasing agent to dope. The dope is pliable on a drum or band, evaporating the solvent to form a film. It is preferable to adjust density | concentration so that dope before casting may be 18 to 35% of solid content. It is preferable to finish the surface of a drum or a band in a mirror state. As for the casting and drying method in the solvent cast method, U.S. Pat.Nos. 2336310, 2367603, 2492078, 2492977, 2492978, 2607704, 2739069, 2739070, British Patent 640731, Each specification of 737392, Unexamined-Japanese-Patent No. 45-4554, 49-5614, Unexamined-Japanese-Patent No. 60-176834, 60-203430, and 62-115035 is described. The dope is preferably cast on a drum or band having a surface temperature of 10 ° C. or lower. It is preferable to dry by air for 2 seconds or more after being soft. The obtained film may be peeled off from the drum or the band, and further dried by hot air having a temperature changed in order to 100 to 160 ° C to evaporate the residual solvent. The above method is described in Japanese Patent Publication No. Hei 5-17844. According to this method, it is possible to shorten the time from casting to peeling. In order to carry out this method, it is necessary to gel dope at the surface temperature of the drum or band at the time of casting.

The dope is used as raw material flakes such as halogenated hydrocarbons (dichloromethane, etc.), alcohols (methanol, ethanol, butanol, etc.), esters (methyl formate, methyl acetate, etc.), ethers (dioxane, dioxolane, diethyl ether, etc.). Dissolve in a solvent such as Dichloromethane is a typical solvent for dissolving cellulose acylate. However, from the viewpoint of the global environment and the working environment, the solvent is preferably substantially free of halogenated hydrocarbons such as dichloromethane. "Substantially free" means that the ratio of halogenated hydrocarbons in the organic solvent is less than 5 mass% (preferably less than 2 mass%). Regarding a cellulose acylate film substantially free of halogenated hydrocarbons such as dichloromethane and a method for producing the same, abbreviated as Published Publication No. 2001-1745, issued March 15, 2001, hereinafter published by Publication No. 2001-1745. It is described in

It is also possible to form a film by casting two or more layers of dope using the prepared cellulose acetate solution (dope). The dope is pliable on a drum or band, evaporating the solvent to form a film. It is preferable to adjust density | concentration so that dope before casting may be 10 to 40% of solid content. It is preferable to finish the surface of a drum or a band in a mirror state. In the case of casting a plurality of cellulose acetate solutions, a solution containing cellulose acetate may be cast from a plurality of oil studies formed at intervals in the advancing direction of the support, respectively, and a film may be prepared while laminating them. For example, the method described in each of Unexamined-Japanese-Patent No. 61-158414, Unexamined-Japanese-Patent No. 1-22419, and Unexamined-Japanese-Patent No. 11-198285 can be used. In addition, you may make a film by casting a cellulose acetate solution from two oil studies. For example, JP-A-60-27562, JP-A-61-94724, JP-A-61-947245, JP-A-61-104813, JP-A-61- The method described in each of 158413 and Unexamined-Japanese-Patent No. 6-134933 can be used. Furthermore, the flow of the high viscosity cellulose acetate solution described in JP-A-56-162617 is wrapped with a low viscosity cellulose acetate solution, and a high-viscosity and low viscosity cellulose acetate solution is simultaneously extruded using a casting method of a cellulose acetate film. You may also

The cellulose acetate film can further adjust the retardation value by an extending | stretching process. It is preferable that a draw ratio exists in 0 to 100% of range. In the case of stretching the cellulose acetate film of the present invention, tenter stretching is preferably used, and in order to control the slow axis with high accuracy, it is preferable to minimize the difference in the left and right tenter clip speeds, the separation timing and the like as much as possible.

A plasticizer can be added to a cellulose ester film in order to improve mechanical properties or to improve a drying speed. Phosphoric acid ester or carboxylic acid ester is used as a plasticizer. Examples of phosphate esters include triphenylphosphate (TPP) and tricresylphosphate (TCP). As carboxylic acid ester, a phthalic acid ester and a citric acid ester are typical. Examples of phthalate esters include dimethyl phthalate (DMP), diethyl phthalate (DEP), dibutyl phthalate (DBP), dioctyl phthalate (DOP), diphenyl phthalate (DPP) and di-2-ethylhexyl phthalate (DEHP). Included. Examples of citric acid esters include o-acetylcitrate triethyl (OACTE) and o-acetylcitrate, tributyl (OACTB). Examples of other carboxylic acid esters include butyl oleate, methylacetyl ricinoleate, dibutyl sebacate, and various trimellitic acid esters. Phthalate ester plasticizers (DMP, DEP, DBP, DOP, DPP, DEHP) are preferably used. DEP and DPP are particularly preferred. It is preferable that the addition amount of a plasticizer is 0.1-25 mass% of the quantity of a cellulose ester, It is more preferable that it is 1-20 mass%, It is most preferable that it is 3-15 mass%.

You may add a deterioration inhibitor (for example, antioxidant, a peroxide decomposer, a radical inhibitor, a metal deactivator, an acid trapping agent, amines), and an ultraviolet-ray inhibitor to a cellulose-ester film. Deterioration inhibitors are described in Japanese Unexamined Patent Publications No. 3-199201, 5-1907073, 5-194789, 5-271471, and 6-107854. It is preferable that it is 0.01-1 mass% of the solution (dope) to prepare, and, as for the addition amount of a deterioration inhibitor, it is more preferable that it is 0.01-0.2 mass%. If the amount is less than 0.01% by mass, the effect of the deterioration inhibitor is hardly recognized. When addition amount exceeds 1 mass%, the bleed out (bleeding out) of the deterioration inhibitor to a film surface may be recognized. Examples of particularly preferred deterioration inhibitors include butylated hydroxytoluene (BHT). As for the ultraviolet-ray inhibitor, it is described in Unexamined-Japanese-Patent No. 7-11056.

It is preferable to perform surface treatment of a cellulose acetate film. Specific methods include corona discharge treatment, glow discharge treatment, flame treatment, acid treatment, alkali treatment or ultraviolet irradiation treatment. In addition, as described in JP-A-7-333433, it is also preferably used to form the undercoat layer. From the viewpoint of maintaining the planarity of the film, in these treatments, the temperature of the cellulose acetate film is preferably set to Tg (glass transition temperature) or lower, specifically 150 ° C or lower.

It is particularly preferable that the surface treatment of the cellulose acetate film is subjected to an acid treatment or an alkali treatment, that is, saponification treatment to cellulose acetate, from the viewpoint of adhesion to an alignment film or the like.

Hereinafter, an alkali saponification process is demonstrated to an example concretely.

The alkali saponification treatment is preferably performed in a cycle in which the film surface is immersed in an alkaline solution, neutralized with an acidic solution, washed with water and dried. Examples of the alkaline solution include potassium hydroxide solution and sodium hydroxide solution. It is preferable that it is in the range of 0.1-3.0N, and, as for the prescribed | prescribed concentration of hydroxide ion, it is more preferable that it is in the range of 0.5-2.0N. It is preferable to exist in the range of room temperature-90 degreeC, and, as for alkaline solution temperature, it is more preferable to exist in the range which is 40-70 degreeC.

Moreover, it is preferable that it is 55 mN / m or more, and, as for the surface energy of a cellulose acetate film, it is more preferable to exist in the range of 60-75 mN / m.

The thickness of the cellulose acetate film is usually preferably in the range of 5 to 500 µm, preferably in the range of 20 to 250 µm, more preferably in the range of 30 to 180 µm, particularly preferably in the range of 30 to 110 µm.

The retardation plate can be used in combination with a polarizing film for use in an elliptical polarizing plate. In addition, it is contributed to the expansion of a viewing angle by applying to a transmissive, a reflective, and a transflective liquid crystal display in combination with a polarizing film. Hereinafter, the elliptical polarizing plate and the liquid crystal display device using the retardation plate will be described.

[Elliptical Polarizer]

By laminating a phase difference plate and a polarizing film, an elliptical polarizing plate can be produced. By using a phase difference plate, the elliptical polarizing plate which can enlarge the viewing angle of a liquid crystal display device can be provided. The polarizing film includes an iodine polarizing film and a dye polarizing film or a polyene polarizing film using a dichroic dye. The iodine polarizing film and the dye polarizing film are generally produced using a polyvinyl alcohol film. The polarization axis of the polarizing film corresponds to a direction perpendicular to the stretching direction of the film.

The polarizing film is laminated on the optically anisotropic layer side of the retardation plate. It is preferable to form a transparent protective film on the surface on the opposite side to the side which laminated | stacked the optical compensation sheet of a polarizing film. It is preferable that a transparent protective film is 80% or more in light transmittance. Generally as a transparent protective film, a cellulose ester film, Preferably a triacetyl cellulose film is used. It is preferable to form a cellulose-ester film by the solvent cast method. It is preferable that it is 20-500 micrometers, and, as for the thickness of a transparent protective film, it is more preferable that it is 50-200 micrometers.

[Liquid crystal display device]

The phase difference plate of this invention can be used as an optical compensation sheet of a liquid crystal display device. By using the phase difference plate of this invention, the liquid crystal display device with which the viewing angle was enlarged can be provided, without causing the color change resulting from wavelength dispersion of an optical compensation sheet. The liquid crystal display device usually has a liquid crystal cell, a polarizing element and a retardation plate (optical compensation sheet). The said polarizing element generally consists of a polarizing film and a protective film, and the thing demonstrated by said elliptically polarizing about a polarizing film and a protective film can be used. Retardation plates (optical compensation sheets) for liquid crystal cells in TN mode are described in the specifications of JP-A-6-214116, US Pat. No. 5583679, US Pat. No. 5646703, and German Patent Publication No. 3911620 A1. In addition, the optical compensation sheet for liquid crystal cells of IPS mode or FLC mode is described in Unexamined-Japanese-Patent No. 10-54982. In addition, optical compensation sheets for liquid crystal cells in OCB mode or HAN mode are described in US Patent No. 5805253 and International Publication WO96 / 37804. In addition, the optical compensation sheet for liquid crystal cells of STN mode is described in Unexamined-Japanese-Patent No. 9-26572. In addition, the optical compensation sheet for liquid crystal cells of VA mode is described in patent No. 2866372.

In the present invention, a phase difference plate (optical compensation sheet) for liquid crystal cells of various modes can be produced with reference to the above-mentioned publication. Phase difference plates are TN (Twisted Nematic), IPS (In-Plane Switching), FLC (Ferroelectric Liquid Crystal), OCB (Optically Compensatory Bend), STN (Super Twisted Nematic), VA (Vertically Aligned) and HAN (Hybrid Aligned Nematic) modes It can be used as a liquid crystal display device of various display modes such as. The retarder is particularly effective for optical compensation of liquid crystal display devices in twisted nematic (TN) and optically compensatory bend (OCB) modes.

Example

An Example is given to the following and this invention is demonstrated to it further more concretely. The materials, usage amounts, ratios, treatment contents, treatment procedures, and the like shown in the following examples can be appropriately changed without departing from the spirit of the present invention. Therefore, the scope of the present invention is not limited to the specific example shown below.

Synthesis Example 1

Exemplary compound ((Z4)-(Y1-3)) was synthesized by the following route.

20 ml of concentrated sulfuric acid was added to 1.5 L solution of 200 g (1.22 mol) of parahydroxy cinnamic acid, and the mixture was refluxed for 6 hours. After cooling, 1 L of ethyl alcohol was distilled off under reduced pressure, and ethyl acetate and saturated brine were added and liquid-separated, and the organic phase was neutralized with sodium bicarbonate water. The organic phase was washed with saturated brine, dried over anhydrous magnesium sulfate, and then the solvent was distilled off under reduced pressure to obtain 226 g of (A-1) (yield 97%).

(A-1) 51.4 ml of methoxyethoxymethylchloride (MEMCl) was added to 57.6 g (0.3 mol) of a 600 ml solution of methylene chloride, and 78.4 ml (0.45 mmol) of ethyldiisopropylamine was added to adjust the temperature of the reaction system. It was dripped slowly, maintaining at 30 degrees C or less. After stirring for 3 hours as it was, saturated brine was added and the mixture was separated, the organic phase was washed with dilute hydrochloric acid and saturated brine, dried over anhydrous magnesium sulfate, and then the solvent was distilled off under reduced pressure to obtain 77.4 g of (A-2). Was obtained (yield 92%).

160 ml of dimethyl sulfoxide was dripped at 9.2 g (228 mmol) of sodium hydride and 50.2 g (228 mol) of trimethylsulfonium iodides under nitrogen atmosphere. It was confirmed that no hydrogen was generated and stirred for 30 minutes again. A 600 ml solution of 49.2 g (A-2) (175.6 mmol) of dimethyl sulfoxide was added and stirred at 50 ° C. for 3 hours. After cooling, ethyl acetate and saturated brine were added to separate the liquid, and the organic phase was washed with dilute hydrochloric acid and saturated brine. After drying the organic phase with anhydrous magnesium sulfate, the solvent was distilled off under reduced pressure to obtain 33.6 g of crude product (A-3) (crude yield 65%).

(A-3) 17.4 g (69.3 mmol) of pyridinium paratoluene sulfonic acid was added to 20.4 g (69.3 mmol) of ethyl alcohol 200 ml solvent to reflux. After stirring for 6 hours, after cooling, ethyl acetate and saturated brine were added and the mixture was separated, and the organic phase was washed with dilute hydrochloric acid and saturated brine. The organic phase was dried over anhydrous magnesium sulfate, the solvent was distilled off under reduced pressure, and the residue was purified by silica gel column chromatography using ethyl acetate and a hexane mixed solvent as eluent. 13.0 g (yield 91%) of (A-4) was obtained.

To a 150 ml solution of 12.4 g (60 mmol) of N, N'-dimethylacetoamide (A-4) in a nitrogen atmosphere, 11.2 g (90 mmol) of bromoethanol and 12.4 g (90 mmol) of potassium carbonate were added thereto. It stirred at internal temperature 110 degreeC for 5 hours. After cooling, ethyl acetate and saturated brine were added to separate the liquid, and the organic phase was washed with dilute hydrochloric acid and saturated brine. The organic phase was dried over anhydrous magnesium sulfate, the solvent was distilled off under reduced pressure, and the residue was purified by silica gel column chromatography using ethyl acetate and a hexane mixed solvent as eluent. 14.0g (yield 93%) of (A-5) was obtained.

(A-5) An aqueous solution in which 4.2 g (100 mmol) of lithium hydroxide monohydrate was dissolved in 100 mL of water was added to a 100 mL solution of 14.0 g (55.5 mmol) of tetrahydrofuran, followed by stirring at reflux for 6 hours. After cooling, ethyl acetate and saturated brine were added to separate the liquid, and the organic phase was washed with dilute hydrochloric acid and saturated brine. The organic phase was dried over anhydrous magnesium sulfate, the solvent was distilled off under reduced pressure, and the residue was purified by silica gel column chromatography using ethyl acetate and a hexane mixed solvent as eluent. 11.7g (yield 95%) of (A-6) was obtained.

(A-6) 3.24 mL (40 mmol) of acrylic acid chloride, 5.06 mL (40 mmol) of dimethylaniline, and 0.3 mL of nitrobenzene were added to a 100 mL solution of 7.4 g (33.2 mmol) of tetrahydrofuran, and the internal temperature was 60 ° C. Stirred for 3 hours. After cooling, ethyl acetate and saturated brine were added to separate the liquid, and the organic phase was washed with dilute hydrochloric acid and saturated brine. The organic phase was dried over anhydrous magnesium sulfate, the solvent was distilled off under reduced pressure, 100 ml of N, N'-dimethylacetamide and 5.6 ml (40 mmol) of triethylamine were added to the residue, followed by stirring at 60 ° C for 2 hours. . After cooling, ethyl acetate and saturated brine were added to separate the liquid, and the organic phase was washed with dilute hydrochloric acid and saturated brine. The organic phase was dried over anhydrous magnesium sulfate, and then the solvent was distilled off under reduced pressure, and the mixture was purified from an ethyl acetate and hexane mixed solvent to obtain 7.2 g (yield 78%) of (A-7).

Under nitrogen atmosphere, 1.15 mL (14.8 mmol) of methanesulfonyl chloride was added to 100 mL of 4.1 g (14.8 mmol) of tetrahydrofuran solution (A-7) under ice cooling, and 2.58 mL of ethyldiisopropylamine ( 14.8 mmol) was slowly added dropwise. After dripping, it heated up to room temperature and stirred for 30 minutes. After confirming the reaction by TLC, it was ice-cooled, and 50 ml of a tetrahydrofuran solution of 0.63 g (1.85 mmol) of a monohydrate of 2,3,6,7,10,11-hexahydroxytriphenylene was added again. 2.13 ml (12.25 mmol) of ethyldiisopropylamine were slowly added dropwise. After completion of the dropwise addition, a catalytic amount of N, N-dimethylaminopyridine was added, and the temperature was raised to room temperature as it was, followed by stirring for 3 hours. Ethyl acetate and saturated brine were added and liquid-separated, and the organic phase was wash | cleaned with dilute hydrochloric acid and saturated brine. The organic phase was dried over anhydrous magnesium sulfate, the solvent was distilled off under reduced pressure, and the residue was purified by silica gel column chromatography using dichloromethane and methanol mixed solvent as eluent. It refine | purified from the ice-cold methanol, and obtained 2.8 g (yield 82%) of exemplary compound ((Z4)-(Y1-3)). The ¹ H NMR measurement results and various properties of the compound obtained below are shown.

Synthesis Examples 2 and 3

Exemplary compound ((Z4)-(Y1-4)) and ((Z4)-(Y1-5)) were synthesized except that bromoethanol of Synthesis Example 3 was changed to bromopropanol and bromobutanol. In the same manner as in Example Compound (4), yield 33% (8 Steps), example compound (5) yield 24% (8 Steps) were synthesized. The ¹ H NMR measurement results and various properties of the compound obtained below are shown respectively.

Exemplary Compounds ((Z4)-(Y1-4))

Exemplary Compounds ((Z4)-(Y1-5))

Synthesis Example 4

Exemplary compound ((Z4)-(Y2-11)) was synthesized by the following route.

36.0 g (0.33 mol) of hydroquinone and 62.4 g (0.45 mol) of 3-bromo-1-propanol were added to 1 L of 51.0 g (1.28 mol) sodium hydroxide aqueous solution, and it stirred for 6 hours under heating and reflux. Under ice-cooling, the mixture was neutralized with sulfuric acid and extracted with ethyl acetate. The solvent was distilled off under reduced pressure, and the residue was purified by silica gel column chromatography using ethyl acetate and a hexane mixed solvent as the eluent. It was refine | purified from the ethyl acetate / hexane mixed solvent, and 27.8g (yield 51%) of (B-1) was obtained.

Under a nitrogen atmosphere, a solution of 500 ml of acetone 500 ml of 4-bromocrotonate (85%), 36.5 g (0.17 mol), (B-1) 25.2 g (0.15 mol) and potassium carbonate 41.5 g (0.3 mol) was heated to reflux. It stirred for 5 hours. Potassium carbonate was removed by filtration, and the solvent was distilled off under reduced pressure. Ethyl acetate and water were added and liquid-separated into the obtained composition, and the organic layer was wash | cleaned with dilute hydrochloric acid and saturated brine. The organic layer was dried over anhydrous magnesium sulfate, the solvent was distilled off under reduced pressure, and the residue was purified by silica gel column chromatography. 33.8g (yield 85%) of (B-2) was obtained.

(B-2) 240 ml of aqueous solutions of 8.6 g (200 mol) of lithium hydroxide monohydrates were added to 300 ml of 33.8 g (127 mmol) tetrahydrofuran solutions. After adding 50 ml of methyl alcohol, the temperature of the reaction system was heated up to 45 degreeC, and it stirred for 5 hours. After neutralizing with dilute hydrochloric acid, ethyl acetate and water were added for separation, and the organic layer was washed with dilute hydrochloric acid and saturated brine. The organic layer was dried over anhydrous magnesium sulfate, and then the solvent was distilled off under reduced pressure. The residue was purified by an ethyl acetate / hexane mixed solvent to obtain 26.9 g (yield 84%) of (B-3).

In a nitrogen atmosphere, 12.2 g (100 mmol) of dimethylaniline, 0.3 mL of nitrobenzene, and 9.2 g (100 mmol) of acrylic acid chloride were added to 250 mL of 20.6 g (82 mmol) tetrahydrofuran solution (B-3). It stirred at 3 degreeC. After cooling, ethyl acetate and water were added to separate the liquid, and the organic layer was washed with dilute hydrochloric acid and saturated brine. The organic layer was dried over anhydrous magnesium sulfate, and then the solvent was distilled off under reduced pressure. The obtained composition was dissolved in 200 ml of N, N-dimethylacetoamide, 10.2 g (100 mmol) of triethylamine was added, and the mixture was stirred at 60 ° C for 2 hours. After cooling, ethyl acetate and water were added to separate the liquid, and the organic layer was washed with dilute hydrochloric acid and saturated brine. The organic layer was dried over anhydrous magnesium sulfate, and then the solvent was distilled off under reduced pressure. The residue was purified by an ethyl acetate / hexane mixed solvent to obtain 18.1 g (yield 72%) of (B-3).

(B-3) To 300 mL of 10.5 g (34.3 mmol) tetrahydrofuran solution, 3.9 g (34.3 mmol) of methanesulfonyl chloride was added under ice cooling, and 4.4 g (34.3 mmol) of ethyldiisopropylamine were added. Was slowly added dropwise. After dripping, it heated up to room temperature and stirred for 30 minutes. After confirming the reaction by TLC, it was ice-cooled and 150 ml of a tetrahydrofuran solution of 1.47 g (4.3 mmol) of a monohydrate of 2,3,6,7,10,11-hexahydroxytriphenylene was added thereto. 50 ml of tetrahydrofuran solution of 3.9 g (30.1 mmol) of ethyldiisopropylamine was slowly added dropwise. After completion of the dropwise addition, a catalytic amount of N, N-dimethylaminopyridine was added, and the temperature was raised to room temperature as it was, followed by stirring for 3 hours. The mixture was separated by adding ethyl acetate and water, and the organic layer was washed with dilute hydrochloric acid and saturated brine. The organic layer was dried over anhydrous magnesium sulfate, the solvent was distilled off under reduced pressure, and the residue was purified by silica gel column chromatography using ethyl acetate and a hexane mixed solvent as eluent. Purified from methyl alcohol, 5.4 g (yield 61%) of exemplary compound ((Z4)-(Y2-11)) was obtained. The ¹ H NMR measurement results and various properties of the compound obtained below are shown.

Synthesis Example 5 and 6: Synthesis of Exemplary Compounds ((Z4)-(Y2-10)) and ((Z4)-(Y2-12)]

Exemplary compounds ((Z4)-(Y2-10)) and ((Z4)-(Y2-12) are the same molar amounts of 2-bromoethanol and 3-bromo-1-propanol shown in Synthesis Example 4, respectively; Synthesis was carried out in the same manner, except that the mixture was changed to 4-bromo-1-butanol, and the results of ¹ H NMR measurement and various properties of the obtained compound were shown.

Yield 25% (5 Steps) of Exemplary Compound ((Z4)-(Y2-10));

Yield 15% of Exemplary Compound ((Z4)-(Y2-12) (5 Steps);

Synthesis Example 7

Synthesis of Exemplary Compound ((Z4)-(Y3-3))

Example compound ((Z4)-(Y3-3)) was synthesize | combined by the route shown below.

Under nitrogen atmosphere, 1.71 g (5 mmol) of a monohydrate of 2,3,6,7,10,11-hexahydroxytriphenylene was dissolved in 10 ml of N, N-dimethylformamide, and octyl chloroformate at room temperature. 9.6 g (50 mmol) was dripped. 50 ml of pyridine was added dropwise while maintaining the temperature in the reaction system at 35 degrees or less, and the mixture was stirred for 2 hours as it was. The mixture was separated by adding ethyl acetate and water, and the organic layer was washed with dilute hydrochloric acid and saturated brine. The organic layer was dried over anhydrous magnesium sulfate, the solvent was distilled off under reduced pressure, and the residue was purified by silica gel column chromatography using ethyl acetate and a hexane mixed solvent as eluent. Filtration was carried out from ethyl acetate and a hexane mixed solvent to obtain 4.6 g (yield 73%) of Exemplary Compound ((Z4)-(Y3-3)). The ¹ H NMR measurement results and various properties of the compound obtained below are shown.

Synthesis Examples 8 and 9

Synthesis of Exemplary Compounds ((Z4)-(Y3-1)), ((Z4)-(Y3-4))

Exemplary compounds ((Z4)-(Y3-1)) and ((Z4)-(Y3-4)) are obtained by replacing octyl chloroformate shown in Synthesis Example 7 with the same molar amount of heptyl chloroform and nonyl chloroformate, respectively. In addition, it could be synthesized in the same manner. The ¹ H NMR measurement results and various properties of the compound obtained below are shown respectively.

Yield 70% of exemplary compound ((Z4)-(Y3-1))

Yield 73% of exemplary compound ((Z4)-(Y3-4))

Synthesis Example 10

Example compound ((Z4)-(Y4-1)) was synthesize | combined by the route shown below.

To a 70 mL solution of 9.40 g (68.0 mmol) of 4-hydroxybenzoic acid and 13.7 mL (170 mmol) of pyridine tetrahydrofuran, 18.3 mL (90.2 mmol) of decanoyl chloride was added dropwise under ice cooling, followed by stirring overnight. Thereafter, the reaction solution was poured into 480 ml of water, and the crystals were filtered and washed with boiling water again. Purification with hexane was carried out to obtain 13.6 g (68%) of (C-1).

(C-1) 1.28 mL (16.5 mmol) of methanesulfonyl chloride and 3.10 mL (18.0 mmol) of ethyldiisopropylamine were added to 30 mL of 4.82 g (16.5 mmol) tetrahydrofuran solution under ice cooling. 3 mL solution of hydrofuran was added dropwise. After dripping, it heated up to room temperature and stirred for 1 hour. Thereafter, ice-cooled, 10 ml of a tetrahydrofuran solution of 513 mg (1.50 mmol) of a monohydrate of 2,3,6,7,10,11-hexahydroxytriphenylene was added thereto, followed by ethyl diisopropylamine. 3.10 mL (18.0 mmol) was added dropwise. After completion of the dropwise addition, a catalytic amount of N, N-dimethylaminopyridine was added, and the temperature was raised to room temperature as it was, followed by stirring for 5 hours. Ethyl acetate was added and the organic layer was washed three times with dilute hydrochloric acid. The organic layer was dried over anhydrous magnesium sulfate, the solvent was distilled off under reduced pressure, and the residue was purified by silica gel column chromatography (eluate: ethyl acetate / hexane = 1/2). 2.20 g (75%) of exemplary compounds ((Z4)-(Y4-1)) were obtained by self-refining refine | purifying the obtained crystal in acetonitrile. The ¹ H NMR measurement result of the obtained compound is shown below.

Synthesis Example 11

Example compound ((Z16)-(Y5-3)) was synthesize | combined by the route shown below.

15.0 g of 4-cyanophenols were dissolved in 300 ml of dimethylformamide, 20.9 g of potassium carbonate and 18.5 ml of 1-bromohexane were added, followed by stirring at 110 ° C. for 5 hours under a nitrogen atmosphere. Water was added to the reaction solution, followed by extraction with ethyl acetate and washing with saturated brine. The organic layer was concentrated under reduced pressure, and then purified by column chromatography to obtain 25.0 g of (D-1).

25.0 g of (D-1) was dissolved in 200 ml of ethanol, and 26.0 ml of a 50% hydroxylamine solution was added, followed by stirring at 90 ° C for 3 hours. After cooling, methanol was added to the reaction solution, and the precipitated crystals were separated by filtration and dried to obtain 29.0 g of crystals of (D-2).

29.0 g of (D-2) was dissolved in 300 ml of 1,4-dioxane, and 10.2 g of trimesic acid chloride and 10.9 ml of pyridine were added, followed by stirring at 90 ° C for 7 hours. After cooling, methanol was added and the precipitated crystals were filtered off. Purification by column chromatography gave 25 g of exemplary compound ((Z16)-(Y5-3)). ¹ H NMR of the obtained compound is shown below.

Synthesis Example 12

Exemplary compound ((Z16)-(Y5-7)) was synthesized by the route shown below.

11.0 g of (E-1) was dissolved in 100 mL of CH ₂ Cl ₂ , and 135 mL of boron tribromide (1.0 MCH ₂ Cl ₂ solution) was added. After stirring at 40 ° C. for 8 hours, water was added to the reaction solution, and the precipitated crystals were collected by filtration. By drying this crystal, 7.5g of (E-2) was obtained.

After dissolving 0.34 g of 2-bromobutanol in 5 ml of dimethylacetamide, 0.26 ml of acrylic acid chloride was added dropwise, and after stirring at room temperature for 1 hour, 20 ml of water and 20 ml of hexane were added to wash the organic layer. After separation, the hexane layer was distilled off, 0.3 g of the above (E-2), 0.44 g of potassium carbonate and dimethylformamide were added, and the mixture was stirred at 110 ° C for 5 hours. 0.36 g of crystals of the exemplary compound ((Z16)-(Y5-7)) was obtained by adding water to the reaction solution, extracting with CH ₂ Cl _2, and then concentrating and purifying the organic layer using column chromatography. ¹ H NMR of the obtained compound is shown below.

Synthesis Example 13

Exemplary compound ((Z16)-(Y5-38)) was synthesized according to the following scheme.

After 0.73 g of 2-hydroxyethyl acrylate was dissolved in 10 ml of tetrahydrofuran, 0.84 ml of dimethylaniline under ice cooling was added dropwise, and 0.62 g of triphosgene was added. After returning to room temperature and stirring for 2 hours, 0.35 g of (E-2) was added under ice cooling, 0.31 ml of pyridine was dripped, and it stirred at room temperature for 2 hours. After reaction, methanol was added and the precipitated crystal | crystallization was filtrated. Purification by column chromatography gave 0.38 g of exemplary compound ((Z16)-(Y5-38)). ¹ H NMR of the obtained compound is shown below.

Synthesis Example 14

Exemplary compound ((Z16)-(Y5-26)) was synthesized according to the following scheme.

13 g of 4-hydroxybutyl acrylate is dissolved in 450 ml of acetone, and a solution in which 180 ml of water and 60 ml of sulfuric acid is added is added dropwise to this solution under ice cooling. After stirring at room temperature for 5 hours, acetone was distilled off under reduced pressure, water was added to the reaction solution, and the mixture was extracted with ethyl acetate. The organic layer was concentrated under reduced pressure, and then purified by column chromatography to obtain 10.9 g of (F-1). 3.2 g of (F-1) was dissolved in 10 ml of toluene, 4.5 ml of thionyl chloride and dimethylformamide were added, followed by stirring at 40 ° C for 20 minutes. Toluene was distilled off under reduced pressure to obtain (F-2). 0.35 g of (E-2) was dissolved in 10 ml of tetrahydrofuran, 0.43 ml of diisopropylethylamine, catalytic amount of dimethylaminopyridine, and 0.88 g of (F-2) were added, followed by stirring at room temperature for 1 hour. After reaction, methanol was added and the precipitated crystal | crystallization was filtrated. Purification by column chromatography gave 0.40 g of exemplary compound ((Z16)-(Y5-26)). ¹ H NMR of the obtained compound is shown below.

Synthesis Example 15

Exemplary compound ((Z16)-(Y5-52)) was synthesized according to the following scheme.

It synthesize | combined by the method similar to the synthesis example 11, and obtained 35g of exemplary compounds ((Z16)-(Y5-52)). ¹ H NMR of the obtained compound is shown below.

Synthesis Example 16

Synthesis of Exemplary Compound ((Z16)-(Y5-58))

Using 4-bromo-1-butanol as a raw material, it synthesize | combined by the method similar to Example 12 and obtained 8.0g of exemplary compounds ((Z16)-(Y5-58)). The ¹ H NMR measurement result of the obtained compound is shown below.

Synthesis Example 17

Exemplary compound ((Z16)-(Y5-89)) was synthesized according to the following scheme.

By using 4-hydroxybutyl acrylate as a raw material, it synthesize | combined by the same method as Example 13 and obtained 20g of exemplary compounds ((Z16)-(Y5-89)). ¹ H NMR of the obtained compound is shown below.

Synthesis Example 18

Exemplary compound ((Z16)-(Y5-101)) was synthesized according to the following scheme.

To 5.18 g of sodium hydride, 100 ml of tetrahydrofuran and 11.7 ml of hexanol are added. After 20 minutes of stirring at room temperature, a solution of 10 g of 3,4-difluorobenzonitrile dissolved in 80 ml of tetrahydrofuran was added dropwise under ice cooling. After stirring at room temperature for 5 hours, water was added dropwise to the reaction solution, followed by extraction with ethyl acetate, and then the organic layer was concentrated and purified using column chromatography to obtain 15.5 g of crystal of (h-1). Thereafter, the reaction was performed in the same manner as in Example 11 to obtain an exemplary compound ((Z16)-(Y5-101)). ¹ H NMR of the obtained compound is shown below.

Synthesis Example 19

Exemplary compound ((Z16)-(Y5-109)) was synthesized according to the following scheme.

The compound was synthesized in the same manner as in Example 12 using 6-bromo-1-hexanol as a raw material to obtain 0.35 g of an exemplary compound ((Z16)-(Y5-109)). ¹ H NMR of the obtained compound is shown below.

Synthesis Example 20

Exemplary compound ((Z16)-(Y5-136)) was synthesized according to the following scheme.

It synthesize | combined by the method similar to Example 13, and 0.35g of exemplary compounds ((Z16)-(Y5-136)) were obtained. The ¹ H NMR measurement result of the obtained compound is shown below.

Example 1

(Measurement of Solution Absorption in Chloroform of Discoid Compound)

The absorbance of the solution prepared by dissolving an exemplary compound ((Z4)-(Y1-3)) in chloroform is measured in a range of 240 nm to 450 nm by a spectrometer UV-2550 (Shimazu Corporation). 1, the horizontal axis represents measurement wavelength (nm), and the vertical axis represents absorbance (standardized absorption maximum is 1). The maximum absorption wavelength of the absorption spectrum of this solution was 266.2 nm.

[Examples 2 to 13]

In the same manner as in Example 1, exemplary compounds ((Z4)-(Y1-4)), ((Z4)-(Y1-5)), ((Z4)-(Y2-11)), ((Z4) -(Y2-10)), ((Z4)-(Y2-12)), ((Z16)-(Y5-7)), ((Z16)-(Y5-38)), ((Z16)-( Y5-26)), ((Z16)-(Y5-58)), ((Z16)-(Y5-89)), ((Z16)-(Y5-109)) and ((Z16)-(Y5- 136)) was measured by the absorption spectrum of the chloroform solution to determine the maximum absorption wavelength.

In Table 1 below, the maximum absorption wavelength of the chloroform solution of each compound is shown.

[Comparative Examples 1,2]

In the same operation as in Example 1, the absorption spectra of the chloroform solutions of the following disk-shaped compounds (A) and (B) were respectively measured. In Table 1 below, the maximum absorption wavelength is shown.

Comparative Disk Shape Compound (A): Compound described in JP-A-8-50206

Comparative Disk Shape Liquid Crystal Compound (B): JP 2001-166147 A Compound

Example 14

(Production of Transparent Support)

The following component was thrown into the mixing tank, and it stirred by heating, and prepared the cellulose acetate solution (henceforth dope).

Cellulose Acetate Solution Composition

100 parts by mass of cellulose acetate having a degree of acetylation of 60.9%

6.5 parts by mass of triphenylphosphate

5.2 parts by mass of biphenyldiphenylphosphate

0.1 parts by mass of the following retardation increasing agent (1)

0.2 parts by mass of the following retardation increasing agent (2)

310.25 parts by mass of methylene chloride

Methanol 54.75 parts by mass

10.95 parts by mass of 1-butanol

Retardation synergist (1)

Retardation Synergist (2)

The obtained dope was cast on the drum cooled to 0 degreeC from oil study. It peels in the state of 70 mass% of solvent content rates, and fixes the both ends of the width direction of a film with a pin tenter, and the elongation of the width direction (direction perpendicular | vertical to a machine direction) is 3 in the region of 3-5 mass% of solvent content rates. Drying was maintained at intervals of%. Then, it conveys between the rolls of a heat processing apparatus, and it dries again and the elongation of a machine direction is real 0% in the area | region exceeding 120 degreeC, considering the 4% extension adjustment to a machine direction at the time of peeling, the width direction The elongation ratio of and the elongation ratio of the machine direction were adjusted to 0.75 to prepare a cellulose acetate film having a thickness of 100 µm. When the retardation value of the produced film was measured at the wavelength of 632.8 nm, the retardation value of the thickness direction was 40 nm, and the in-plane retardation value was 4 nm. The produced cellulose acetate film was used as a transparent support body.

(Formation of the first undercoat layer)

On the transparent support, 28 ml / m <2> of coating liquids of the following composition were apply | coated, and it dried, and formed the 1st undercoat.

First Subfloor  Coating liquid composition

5.44 parts by mass of gelatin

Formaldehyde 1.38 parts by mass

Salicylic acid 1.62 parts by mass

Acetone 391 parts by mass

158 parts by mass of methanol

406 parts by mass of methylene chloride

12 parts by mass of water

(Formation of the second undercoat layer)

7 ml / m <2> of the coating liquid of the following composition was apply | coated on the 1st undercoat layer, it dried, and the 2nd undercoat layer was formed.

2nd Subfloor  Coating liquid composition

0.77 parts by mass of the following anionic polymer

10.1 parts by mass of monoethyl citrate

Acetone 200 parts by mass

877 parts by mass of methanol

40.5 parts by mass of water

Anionic polymer

(Formation of white layer)

25 ml / m <2> was apply | coated to the opposite side of a transparent support body, and it dried, and the white layer was formed.

White floor  Coating liquid composition

6.56 parts by mass of cellulose diacetate having an acetylation degree of 55%

0.65 parts by mass of silica-based mat agent (average particle size: 1 μm)

Acetone 679 parts by mass

104 parts by mass of methanol

(Formation of alignment film)

The following modified polyvinyl alcohol and glutaraldehyde (5% by mass of modified polyvinyl alcohol) were dissolved in a mixed solvent of methanol / water (volume ratio = 20/80) to prepare a 5% by mass solution.

This solution was apply | coated on the 2nd undercoat layer, and it dried for 120 second by the warm air of 100 degreeC, and then rubbed and formed the orientation film. The film thickness of the obtained alignment film was 0.5 micrometer. The rubbing direction of the alignment film was parallel to the casting direction of the transparent support.

(Formation of Optically Anisotropic Layer)

On the rubbing process surface of the orientation film produced above, the optically anisotropic layer coating liquid which has the following composition was apply | coated using the wire bar of # 4.

optics Anisotropic layer  Coating liquid

100 parts by mass of the liquid crystal compound (((Z4)-(Y1-3))) of the present invention

Photopolymerization initiator (Irgacure 907, Nippon Chiba Kaigi Co., Ltd.) 3.3 parts by mass

Sensitizer (Kayacure DETX, Nippon Gunpowder Co., Ltd.) 1.1 parts by mass

250 parts by mass of methyl ethyl ketone

The film which apply | coated the said optically anisotropic layer was orientated in the thermostat, the ultraviolet-ray of 200mJ / cm <2> was irradiated, and the orientation state of the optically anisotropic layer was fixed. It cooled to room temperature and produced the optical compensation sheet.

[Examples 15 to 26]

(Formation of Optically Anisotropic Layer)

Example compound ((Z4)-(Y1-4) instead of the example compound ((Z4)-(Y1-3)) used in Example 14 on the rubbing process surface of the alignment film produced by the method similar to the said Example 14 ), ((Z4)-(Y1-5)), ((Z4)-(Y2-11)), ((Z4)-(Y2-10)), ((Z4)-(Y2-12)), ((Z16)-(Y5-7)), ((Z16)-(Y5-38)), ((Z16)-(Y5-26)), ((Z16)-(Y5-58)), (( It carried out similarly to Example 14 except using (Z16)-(Y5-89)), ((Z16)-(Y5-109)), ((Z16)-(Y5-136)).

Comparative Example 3

The optically anisotropic layer coating liquid of the following composition was apply | coated to the orientation film produced in Example 14 using the wire bar of # 4.

optics Anisotropic layer  Coating liquid

100 parts by mass of the comparative discotic liquid crystalline compound (A)

Ethylene Oxide Modified Trimethylol Propane Triacrylate

(V # 360, Osaka Organic Chemical Co., Ltd.) 9.9 parts by mass

Photopolymerization initiator (Irgacure 907, Nippon Chiba Kaigi Co., Ltd.) 3.3 parts by mass

Sensitizer (Kayacure DETX, Nippon Gunpowder Co., Ltd.) 1.1 parts by mass

Cellulose acetate butyrate

(CAB551-0.2, manufactured by Eastman Chemical Co., Ltd.) 2. 2 parts by mass

Cellulose acetate butyrate

(CAB531-1, manufactured by Eastman Chemical Co., Ltd.) 0.55 parts by mass

250 parts by mass of methyl ethyl ketone

The film which apply | coated said optically anisotropic layer was orientated, the ultraviolet-ray of 200mJ / cm <2> was irradiated, and the orientation state of the optically anisotropic layer was fixed. It cooled to room temperature and produced the optical compensation sheet.

[Comparative Example 4]

An optical compensation sheet was produced in the same manner as in Comparative Example 3, except that instead of the disk compound (A) used in Comparative Example 3, the disk compound (B) was used.

(Measurement of wavelength dispersion value)

The wavelength dependence of the retardation value of the optical compensation sheets obtained in Examples 14-26 and Comparative Examples 3 and 4 was measured using KOBRA 21 ADH (manufactured by Oclock Co., Ltd.). The value of the wavelength dispersion was expressed by dividing the retardation value of 478 nm by 747 nm. The results are shown in Table 2. In Table 2, the maximum absorption wavelength of the chloroform solution of Table 1 was also shown.

In addition, in order to consider the correlation between the maximum absorption wavelength in chloroform shown in Table 2 and the value of the wavelength dispersion, the values of the maximum absorption wavelength and the wavelength dispersion were plotted with respect to each exemplary compound. This graph is shown in FIG.

From the graph shown in Fig. 2, it is clear that the value of the wavelength dispersion of the optical compensatory sheet correlates with the absorption maximum wavelength of the chloroform solution of the disk-shaped compound to be used, and the disk shape having the maximum absorption wavelength of the absorption spectrum of the chloroform solution is 270 nm or less. It can be seen that the optical compensation sheet formed using the compound has a small value that is an index of wavelength dispersion. This means that the optical compensation sheet produced using the disc-shaped compound has little color change when used in a liquid crystal display device and contributes to the expansion of the viewing angle.

The retardation plate of this invention has the optically anisotropic layer formed using the disk shaped compound whose maximum absorption wavelength in a chloroform solution is 270 nm or less. The optically anisotropic layer has a small wavelength dispersion. Therefore, when the phase difference plate of this invention is used for a liquid crystal display device, there is little color change of a display image, and contributes to expansion of a viewing angle.

Claims (4)

Retardation plate having an optically anisotropic layer formed of a disk-shaped compound, At least one of the discotic compounds is a discotic plate having a discotic compound having a maximum absorption wavelength of 270 nm or less in a chloroform solution. The method of claim 1, The said disc shaped compound is a phase difference plate which shows liquid crystallinity. The method according to claim 1 or 2, Said disc shaped compound is a phase difference plate which expresses a discotic nematic phase. The method according to any one of claims 1 to 3, The retardation plate which has an optically anisotropic layer formed by fixing the said disk compound in the orientation state which shows a discotic nematic phase.

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