JP2019061291A - Polarizing plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polarizing plate which suppresses changes in excellent viewing angle characteristics and display characteristics. The polarizing plate of the present invention is used for an organic EL panel; a polarizer, a first protective film arranged on one side of the polarizer, and a polarizer side on the other side of the polarizer. A second protective film, a first retardation layer, and a second retardation layer arranged in order from the first are provided. The first retardation layer exhibits a refractive index characteristic of nx> ny = nz and satisfies the relationship of Re (450) <Re (550); the second retardation layer has a refractive index of nz> nx ≧ ny. The characteristics are shown; the angle θ formed by the absorption axis of the polarizer and the slow axis of the first retardation layer satisfies the relationship of 35 ° ≤ θ ≤ 55 °; the first retardation layer and the second retardation layer. The Re (550) of the laminate with the retardation layer is 120 nm to 160 nm; the water absorption of the first retardation layer is 3% or less; the Re (550) of the second protective film is 0 nm to 10 nm. is there. [Selection diagram] Fig. 1

Description

The present invention relates to a polarizing plate.

  In recent years, with the spread of thin displays, displays equipped with organic EL panels have been proposed. Since the organic EL panel has a highly reflective metal layer, it tends to cause problems such as reflection of external light and reflection of the background. Therefore, it is known to prevent these problems by providing a circularly polarizing plate on the viewing side. As a general circularly polarizing plate, a retardation film (typically, a λ / 4 plate) represented by a cycloolefin (COP) -based resin film, and its slow axis is about the absorption axis of the polarizer It is known to be laminated at an angle of 45 °. It is known that a retardation film of a COP resin has a so-called flat wavelength dispersion characteristic in which the retardation value is substantially constant independently of the wavelength of measurement light. When a circularly polarizing plate including a retardation film having such flat wavelength dispersion characteristics is used for an organic EL panel, there is a problem that an excellent reflection hue can not be obtained.

  In order to solve the above problems, a circularly polarizing plate is proposed which includes a retardation film having so-called inverse dispersion wavelength dependency (inverse dispersion wavelength characteristics) in which the retardation value increases according to the wavelength of measurement light. (E.g., Patent Document 1). When such a circularly polarizing plate is used for an organic EL panel, external light reflection and reflection hue in the front direction can be greatly improved. However, when the panel is viewed from an oblique direction, a hue different from the hue in the front direction is obtained, and this hue difference is a big problem. In addition, it has also been confirmed that the display characteristics of the panel change with time.

Patent No. 3325560

  The present invention has been made to solve the above-mentioned conventional problems, and its main object is to provide a polarizing plate which suppresses the change of excellent viewing angle characteristics and display characteristics.

The polarizing plate of the present invention is used for an organic EL panel; a polarizer , a first protective film disposed on one side of the polarizer, and the other side of the polarizer from the polarizer side A second protective film, a first retardation layer, and a second retardation layer arranged in order ; the first retardation layer exhibits a refractive index characteristic of nx> ny = nz, and Re 450) satisfy the relationship of <Re (550); the second retardation layer exhibits a refractive index characteristic of nz> nx ≧ ny; the absorption axis of the polarizer and the retardation of the first retardation layer The angle θ with the axis satisfies the relationship 35 ° ≦ θ ≦ 55 °; Re (550) of the laminate of the first retardation layer and the second retardation layer is 120 nm to 160 nm ; water absorption of the first retardation layer is 3% or less; Re of the second protective film (550) is 0nm~10nm

  According to the present invention, by using the first retardation layer and the second retardation layer satisfying the above optical characteristics and water absorption, the viewing angle characteristics are improved and the change in display characteristics is suppressed. can do.

(A) is a schematic sectional view of a polarizing plate according to a preferred embodiment of the present invention, and (b) is a schematic sectional view of a polarizing plate according to another preferred embodiment of the present invention.

  Hereinafter, preferred embodiments of the present invention will be described, but the present invention is not limited to these embodiments.

(Definition of terms and symbols)
The definitions of terms and symbols in the present specification are as follows.
(1) Refractive index (nx, ny, nz)
“Nx” is the refractive index in the direction in which the in-plane refractive index is maximum (ie, the slow axis direction), and “ny” is the direction orthogonal to the slow axis in the plane (ie, the fast axis direction) And “nz” is the refractive index in the thickness direction.
(2) In-plane retardation (Re)
“Re (550)” is an in-plane retardation measured with light having a wavelength of 550 nm at 23 ° C. Re (550) is calculated | required by a formula: Re = (nx-ny) xd, when the thickness of a layer (film) is set to d (nm). Note that “Re (450)” is an in-plane retardation measured with light of wavelength 450 nm at 23 ° C.
(3) Retardation in the thickness direction (Rth)
“Rth (550)” is a thickness direction retardation measured with light having a wavelength of 550 nm at 23 ° C. Rth (550) is calculated | required by a formula: Rth = (nx-nz) xd, when the thickness of a layer (film) is set to d (nm). “Rth (450)” is the retardation in the thickness direction measured with light of wavelength 450 nm at 23 ° C.
(4) Nz coefficient The Nz coefficient is determined by Nz = Rth / Re.

A. Polarizing Plate The polarizing plate of the present invention comprises a polarizer, a first retardation layer and a second retardation layer, and the first retardation layer and the second retardation layer are laminated on one side of the polarizer. ing. Preferably, the polarizing plate does not include an optically anisotropic layer (for example, a liquid crystal layer or a retardation film) between the polarizer and the first retardation layer or the second retardation layer. Hereinafter, specific examples will be described.

  FIG. 1A is a schematic cross-sectional view of a polarizing plate according to a preferred embodiment of the present invention. The polarizing plate 100 of this embodiment includes a polarizer 10, a protective film 20 disposed on one side of the polarizer 10, and a first retardation layer 30 and a second layer disposed on the other side of the polarizer 10. And a phase difference layer 40. In the illustrated example, the first retardation layer 30 is arranged closer to the polarizer 10 than the second retardation layer 40, but the second retardation layer 40 is arranged closer to the polarizer 10 It may be In the present embodiment, the first retardation layer 30 (second retardation layer 40) can also function as a protective layer of the polarizer 10. In addition, by directly laminating the polarizer and the first retardation layer (second retardation layer) in this manner, a more excellent reflection hue (in particular, viewing angle characteristics) is achieved, and display characteristics are achieved. Change can be suppressed.

  FIG. 1 (b) is a schematic cross-sectional view of a polarizing plate according to another preferred embodiment of the present invention. The polarizing plate 100 ′ includes a polarizer 10, a first protective film 21 disposed on one side of the polarizer 10, and a first retardation layer 30 and a second layer disposed on the other side of the polarizer 10. A retardation layer 40 and a second protective film 22 disposed between the polarizer 10 and the first retardation layer 30 are provided. Preferably, the second protective film 22 is optically isotropic. By the second protective film being optically isotropic, it is possible to achieve a better reflective hue (in particular, viewing angle characteristics). In the illustrated example, the first retardation layer 30 is disposed closer to the polarizer 10 than the second retardation layer 40, but the second retardation layer 40 is disposed on the polarizer 10 side. It may be arranged.

  The first retardation layer 30 has a refractive index characteristic of nx> ny ≧ nz and has a slow axis. The polarizer 10 and the first retardation layer 30 are laminated such that the absorption axis of the polarizer 10 and the slow axis of the first retardation layer 30 form a predetermined angle. The angle θ between the absorption axis of the polarizer 10 and the slow axis of the first retardation layer 30 preferably satisfies the relationship of 35 ° ≦ θ ≦ 55 °, and more preferably 38 ° ≦ θ ≦ 52 °. More preferably, 39 ° ≦ θ ≦ 51 °. If it is out of the above range, the frontal reflectivity is increased, and the reflection preventing function of the polarizing plate can not be sufficiently obtained.

A-1. Polarizer Any appropriate polarizer may be employed as the above-mentioned polarizer. Specific examples include hydrophilic polymer films such as polyvinyl alcohol films, partially formalized polyvinyl alcohol films, and ethylene / vinyl acetate copolymer-based partially saponified films, and dichromatic substances such as iodine and dichroic dyes. And a polyene-based oriented film such as a dehydrated product of polyvinyl alcohol and a dehydrochlorinated product of polyvinyl chloride. Preferably, a polarizer obtained by dyeing a polyvinyl alcohol-based film with iodine and uniaxially stretching it is used because it is excellent in optical properties.

  The staining with iodine is performed, for example, by immersing a polyvinyl alcohol-based film in an aqueous iodine solution. The stretching ratio of the uniaxial stretching is preferably 3 to 7 times. Stretching may be carried out after the dyeing process or may be carried out while dyeing. Moreover, it may be dyed after being drawn. As necessary, the polyvinyl alcohol-based film is subjected to swelling treatment, crosslinking treatment, washing treatment, drying treatment, and the like. For example, by immersing the polyvinyl alcohol-based film in water and washing with water prior to dyeing, it is possible not only to clean the stains and antiblocking agents on the surface of the polyvinyl alcohol-based film, but also to swell the polyvinyl alcohol-based film for dyeing Unevenness can be prevented.

  The thickness of the polarizer is typically about 1 μm to 80 μm.

A-2. First Retardation Layer As described above, the first retardation layer has a refractive index characteristic of nx> ny ≧ nz. The in-plane retardation Re (550) of the first retardation layer is preferably 80 nm to 200 nm, more preferably 100 nm to 180 nm, and still more preferably 110 nm to 170 nm.

  The first retardation layer exhibits so-called inverse dispersion wavelength dependency. Specifically, the in-plane retardation satisfies the relationship of Re (450) <Re (550). By satisfying such a relationship, excellent reflection hue can be achieved. Re (450) / Re (550) is preferably 0.8 or more and less than 1, and more preferably 0.8 or more and 0.95 or less.

  The Nz coefficient of the first retardation layer is preferably 1 to 3, more preferably 1 to 2.5, still more preferably 1 to 1.5, and particularly preferably 1 to 1.3. By satisfying such a relationship, a better reflection hue can be achieved.

  The first retardation layer has a water absorption of 3% or less, preferably 2.5% or less, and more preferably 2% or less. By satisfying such a water absorption rate, it is possible to suppress the temporal change in display characteristics. In addition, a water absorption can be calculated | required based on JISK7209.

  The first retardation layer is typically a retardation film formed of any appropriate resin. As resin which forms this retardation film, polycarbonate resin is preferably used.

  In a preferred embodiment, the polycarbonate resin is a structural unit derived from a dihydroxy compound represented by the following general formula (1), a structural unit derived from a dihydroxy compound represented by the following general formula (2), and A dihydroxy compound represented by the general formula (3), a dihydroxy compound represented by the following general formula (4), a dihydroxy compound represented by the following general formula (5), and a dihydroxy compound represented by the following general formula (6) And a structural unit derived from one or more dihydroxy compounds selected from the group consisting of

（上記一般式（１）中、Ｒ_１〜Ｒ_４はそれぞれ独立に、水素原子、置換若しくは無置換の炭素数１〜炭素数２０のアルキル基、置換若しくは無置換の炭素数６〜炭素数２０のシクロアルキル基、または、置換若しくは無置換の炭素数６〜炭素数２０のアリール基を表し、Ｘは置換若しくは無置換の炭素数２〜炭素数１０のアルキレン基、置換若しくは無置換の炭素数６〜炭素数２０のシクロアルキレン基、または、置換若しくは無置換の炭素数６〜炭素数２０のアリーレン基を表し、ｍ及びｎはそれぞれ独立に０〜５の整数である。）

(In the above general formula (1), R _{1 to} R ₄ each independently represent a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, or a substituted or unsubstituted 6 to 20 carbon atoms Or a substituted or unsubstituted aryl group having 6 to 20 carbon atoms, X is a substituted or unsubstituted alkylene group having 2 to 10 carbon atoms, or a substituted or unsubstituted carbon atom Represents a cycloalkylene group having 6 to 20 carbon atoms or a substituted or unsubstituted arylene group having 6 to 20 carbon atoms, and m and n each independently represent an integer of 0 to 5.)

（上記一般式（３）中、Ｒ_５は炭素数４から炭素数２０の置換若しくは無置換の単環構造のシクロアルキレン基を示す。）

(In the above general formula (3), R ₅ represents a substituted or unsubstituted monocyclic structure cycloalkylene group having 4 to 20 carbon atoms.)

（上記一般式（４）中、Ｒ_６は炭素数４から炭素数２０の置換若しくは無置換の単環構造のシクロアルキレン基を示す。）

(In the above general formula (4), R ₆ represents a substituted or unsubstituted monocyclic structure cycloalkylene group having 4 to 20 carbon atoms.)

（上記一般式（５）中、Ｒ_７は置換若しくは無置換の炭素数２〜炭素数１０のアルキレン基を示し、ｐは２から１００の整数である。）

(In the above general formula (5), R ₇ represents a substituted or unsubstituted alkylene group having 2 to 10 carbon atoms, and p is an integer of 2 to 100.)

（上記一般式（６）中、Ｒ_１１は炭素数２から炭素数２０のアルキル基又は下記式（７）に示す基を表す。）

(In the above general formula (6), R ₁₁ represents an alkyl group having 2 to 20 carbon atoms or a group represented by the following formula (7).)

<Dihydroxy Compound Represented by the General Formula (1)>
Specifically as a dihydroxy compound represented by the said General formula (1), 9, 9- bis (4-hydroxyphenyl) fluorene, 9, 9- bis (4-hydroxy 3- methylphenyl) fluorene, 9,9-bis (4-hydroxy-3-ethylphenyl) fluorene, 9,9-bis (4-hydroxy-3-n-propylphenyl) fluorene, 9,9-bis (4-hydroxy-3-isopropylphenyl) ) 9,9-bis (4-hydroxy-3-n-butylphenyl) fluorene, 9,9-bis (4-hydroxy-3-sec-butylphenyl) fluorene, 9,9-bis (4-hydroxy) -3-tert-propylphenyl) fluorene, 9,9-bis (4-hydroxy-3-cyclohexylphenyl) fluorene, 9,9-biphenyl (4-hydroxy-3-phenylphenyl) fluorene, 9,9-bis (4- (2-hydroxyethoxy) phenyl) fluorene, 9,9-bis (4- (2-hydroxyethoxy) -3-methylphenyl) Fluorene, 9,9-bis (4- (2-hydroxyethoxy) -3-isopropylphenyl) fluorene, 9,9-bis (4- (2-hydroxyethoxy) -3-isobutylphenyl) fluorene, 9,9- Bis (4- (2-hydroxyethoxy) -3-tert-butylphenyl) fluorene, 9,9-bis (4- (2-hydroxyethoxy) -3-cyclohexylphenyl) fluorene, 9,9-bis (4- (4) (2-hydroxyethoxy) -3-phenylphenyl) fluorene, 9,9-bis (4- (2-hydroxyethoxy) -3 5-dimethylphenyl) fluorene, 9,9-bis (4- (2-hydroxyethoxy) -3-tert-butyl-6-methylphenyl) fluorene, 9,9-bis (4- (3-hydroxy-2, Examples thereof include 2-dimethylpropoxy) phenyl) fluorene and the like, and preferably 9,9-bis (4-hydroxy-3-methylphenyl) fluorene, 9,9-bis (4- (2-hydroxyethoxy) phenyl) fluorene 9,9-bis (4- (2-hydroxyethoxy) -3-methylphenyl) fluorene, particularly preferably 9,9-bis (4- (2-hydroxyethoxy) phenyl) fluorene.

<Dihydroxy Compound Represented by the General Formula (2)>
Examples of the dihydroxy compound represented by the general formula (2) include isosorbide, isomannide and isoidet which are in a stereoisomer relationship. One of these may be used alone, or two or more of these may be used in combination. Among these dihydroxy compounds, isosorbide obtained by dehydration condensation of sorbitol which is abundantly available as a resource and is produced from various starches which are easily available is easy to obtain and manufacture, optical properties and moldability Most preferable in terms of

<Dihydroxy Compound Represented by the General Formula (3)>
As a dihydroxy compound represented by the said General formula (3), the compound (alicyclic dihydroxy compound) containing the cycloalkylene group of a monocyclic structure is mentioned. By using a single ring structure, toughness can be improved when the obtained polycarbonate resin is used as a film. Representative examples of the alicyclic dihydroxy compound include compounds containing a 5- or 6-membered ring structure. By being a 5-membered ring structure or a 6-membered ring structure, the heat resistance of the obtained polycarbonate resin can be increased. The six-membered ring structure may be fixed in a chair or cage shape by a covalent bond. Specifically, 1,2-cyclopentanediol, 1,3-cyclopentanediol, 1,2-cyclohexanediol, 1,3-cyclohexanediol, 1,4-cyclohexanediol, 2-methyl-1,4- Cyclohexanediol etc. are mentioned. The dihydroxy compounds represented by formula (3) may be used alone or in combination of two or more.

<Dihydroxy Compound Represented by the General Formula (4)>
As a dihydroxy compound represented by the said General formula (4), the compound (alicyclic dihydroxy compound) containing the cycloalkylene group of a monocyclic structure is mentioned. By using a single ring structure, toughness can be improved when the obtained polycarbonate resin is used as a film. As a representative example of the alicyclic dihydroxy compound, R ₆ in the general formula (4) is a compound represented by the following general formula (Ia) (wherein R ³ is a hydrogen atom, or a substituted or unsubstituted carbon number 1 to carbon number 12 various alkyl isomers are shown. Preferred specific examples of such isomers include 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, 1,4-cyclohexanedimethanol and the like. These are easy to obtain and excellent in handleability. The dihydroxy compounds represented by the general formula (4) may be used alone or in combination of two or more.

  In addition, the compound illustrated above regarding the dihydroxy compound represented by General formula (3) and (4) is an example of the alicyclic dihydroxy compound which can be used, Comprising: It is not limited to these at all.

<Dihydroxy Compound Represented by the General Formula (5)>
Specific examples of the dihydroxy compound represented by the general formula (5) include diethylene glycol, triethylene glycol, polyethylene glycol (molecular weight 150 to 2000) and the like.

<Dihydroxy Compound Represented by the General Formula (6)>
Specific examples of the dihydroxy compound represented by the general formula (6) include ethylene glycol, propylene glycol, 1,4-butanediol, 1,6-hexanediol and a spiro glycol represented by the following formula (8) Among these, propylene glycol, 1,4-butanediol and spiro glycol are preferable.

  Structural unit derived from the dihydroxy compound represented by the general formula (3), structural unit derived from the dihydroxy compound represented by the general formula (4), derived from the dihydroxy compound represented by the general formula (5) Among structural units derived from the dihydroxy compound represented by the general formula (6) and structural units derived from the dihydroxy compound represented by the general formula (6), structural units derived from the dihydroxy compound represented by the general formula (4) and / or the general formula (5) It is preferable to contain the structural unit derived from the dihydroxy compound represented by these, and it is more preferable to contain the structural unit derived from the dihydroxy compound represented by said General formula (5). By including the structural unit derived from the dihydroxy compound represented by the general formula (5), the stretchability can be improved.

The polycarbonate resin of the present embodiment may further contain structural units derived from other dihydroxy compounds.
<Other dihydroxy compounds>
As another dihydroxy compound, bisphenol etc. are mentioned, for example. As bisphenols, for example, 2,2-bis (4-hydroxyphenyl) propane [= bisphenol A], 2,2-bis (4-hydroxy-3,5-dimethylphenyl) propane, 2,2-bis 4-hydroxy-3,5-diethylphenyl) propane, 2,2-bis (4-hydroxy- (3,5-diphenyl) phenyl) propane, 2,2-bis (4-hydroxy-3,5-dibromophenyl) ) Propane, 2,2-bis (4-hydroxyphenyl) pentane, 2,4'-dihydroxy-diphenylmethane, bis (4-hydroxyphenyl) methane, bis (4-hydroxy-5-nitrophenyl) methane, 1,1 -Bis (4-hydroxyphenyl) ethane, 3,3-bis (4-hydroxyphenyl) pentane, 1,1-bis (4-hydride) Roxyphenyl) cyclohexane, bis (4-hydroxyphenyl) sulfone, 2,4'-dihydroxydiphenyl sulfone, bis (4-hydroxyphenyl) sulfide, 4,4'-dihydroxydiphenyl ether, 4,4'-dihydroxy-3,3 There may be mentioned '-dichlorodiphenyl ether, 4,4'-dihydroxy-2,5-diethoxydiphenyl ether and the like.

  The structural unit derived from the dihydroxy compound represented by the general formula (1) in the polycarbonate resin is 18 mol% or more, preferably 20 mol% or more, and more preferably 25 mol% or more. If the structural unit is too small, wavelength dependency of reverse dispersion may not be obtained.

  A dihydroxy compound represented by the general formula (3), a dihydroxy compound represented by the general formula (4), a dihydroxy compound represented by the general formula (5), and a dihydroxy represented by the general formula (6) The structural unit derived from one or more dihydroxy compounds selected from the group consisting of compounds is preferably 25 mol% or more, more preferably 30 mol% or more, still more preferably 35 mol% or more in the polycarbonate resin. It is. If the amount of the structural unit is too small, the toughness of the film may be poor.

  The glass transition temperature of the polycarbonate resin is preferably 110 ° C. or more and 150 ° C. or less, and more preferably 120 ° C. or more and 140 ° C. or less. If the glass transition temperature is excessively low, the heat resistance tends to deteriorate, dimensional change may occur after film formation, and the image quality of the obtained organic EL panel may be deteriorated. If the glass transition temperature is excessively high, the molding stability at the time of film molding may be deteriorated, and the transparency of the film may be impaired. The glass transition temperature is determined in accordance with JIS K 7121 (1987).

  The molecular weight of the polycarbonate resin can be represented by a reduced viscosity. The reduced viscosity is measured using a Ubbelohde viscosity tube at a temperature of 20.0 ° C. ± 0.1 ° C., using methylene chloride as a solvent, precisely adjusting the polycarbonate concentration to 0.6 g / dL. The lower limit of the reduced viscosity is usually preferably 0.30 dL / g, more preferably 0.35 dL / g or more. The upper limit of the reduced viscosity is usually preferably 1.20 dL / g, more preferably 1.00 dL / g, and still more preferably 0.80 dL / g. If the reduced viscosity is less than the lower limit value, there may occur a problem that the mechanical strength of the molded article is reduced. On the other hand, when the reduced viscosity is larger than the upper limit value, the flowability at the time of molding may be reduced, which may cause problems such as a decrease in productivity and a moldability.

  The retardation film is typically produced by stretching a resin film in at least one direction.

  Any appropriate method may be employed as a method of forming the resin film. For example, mention may be made of melt extrusion (for example, T-die molding), cast coating (for example, casting), calendar molding, heat pressing, coextrusion, co-melting, multilayer extrusion, inflation molding, etc. Be Preferably, T-die molding, casting and inflation molding are used.

  The thickness of the resin film (unstretched film) may be set to any appropriate value depending on the desired optical properties, the stretching conditions described later, and the like. Preferably it is 50 micrometers-300 micrometers.

  The said extending | stretching can employ | adopt arbitrary appropriate extending | stretching methods, extending | stretching conditions (for example, extending | stretching temperature, a draw ratio, extending | stretching direction). Specifically, various stretching methods such as free end stretching, fixed end stretching, free end shrinkage, fixed end shrinkage and the like can be used singly or simultaneously or sequentially. The stretching direction can also be performed in various directions and dimensions, such as the horizontal direction, the vertical direction, the thickness direction, and the diagonal direction. The stretching temperature is preferably Tg-30 ° C. to Tg + 60 ° C., more preferably Tg-10 ° C. to Tg + 50 ° C. with respect to the glass transition temperature (Tg) of the resin film.

  By appropriately selecting the stretching method and the stretching conditions, it is possible to obtain a retardation film having the desired optical properties (for example, refractive index characteristics, in-plane retardation, Nz coefficient).

  In one embodiment, the retardation film is produced by uniaxially stretching or uniaxially stretching the resin film. As a specific example of fixed end uniaxial stretching, there is a method of stretching in the width direction (lateral direction) while traveling the resin film in the longitudinal direction. The stretching ratio is preferably 1.1 times to 3.5 times.

  In another embodiment, the retardation film is produced by obliquely stretching a long resin film continuously in the direction of the angle θ with respect to the longitudinal direction. By adopting oblique stretching, a long stretched film having an orientation angle (a slow axis in the direction of angle θ) with respect to the longitudinal direction of the film can be obtained, for example, in lamination with a polarizer. Roll-to-roll is possible, and the manufacturing process can be simplified.

  As a drawing machine used for oblique drawing, for example, a tenter type drawing machine capable of applying a feed force or a drawing force or a take-up force at different speeds in the lateral and / or longitudinal directions can be mentioned. Although a tenter type stretching machine includes a transverse uniaxial stretching machine, a simultaneous biaxial stretching machine, etc., any appropriate stretching machine may be used as long as it can continuously stretch a long resin film obliquely.

  The thickness of the retardation film (stretched film) is preferably 20 μm to 100 μm, more preferably 30 μm to 80 μm, and still more preferably 30 μm to 65 μm.

A-3. Second Retardation Layer As described above, the second retardation layer 40 has a refractive index characteristic of nz> nx ≧ ny. The thickness direction retardation Rth (550) of the second retardation layer is preferably −260 nm to −10 nm, more preferably −230 nm to −15 nm, and still more preferably −215 nm to −20 nm.

  In one embodiment, the second retardation layer has a refractive index of nx = ny. Here, “nx = ny” includes not only when nx and ny are exactly equal but also when nx and ny are substantially equal. Specifically, it means that Re (550) is less than 10 nm. In another embodiment, the second retardation layer has a refractive index of nx> ny. In this case, the in-plane retardation Re (550) of the second retardation layer is preferably 10 to 150, and more preferably 10 to 80.

  The second retardation layer may be formed of any suitable material. Preferably, it is a liquid crystal layer fixed in homeotropic alignment. The liquid crystal material (liquid crystal compound) which can be homeotropically aligned may be a liquid crystal monomer or a liquid crystal polymer. As a specific example of the said liquid crystal compound and the formation method of the said liquid crystal layer, the liquid crystal compound and the formation method as described in-of Unexamined-Japanese-Patent No. 2002-333642 are mentioned. In this case, the thickness is preferably 0.1 μm to 5 μm, more preferably 0.2 μm to 3 μm.

  As another preferable specific example, the second retardation layer may be a retardation film formed of fumaric acid diester resin described in JP 2012-32784 A. In this case, the thickness is preferably 5 μm to 50 μm, more preferably 10 μm to 35 μm.

A-4. Laminate The in-plane retardation Re (550) of the laminate of the first retardation layer and the second retardation layer is 120 nm to 160 nm, preferably 130 nm to 150 nm. The thickness direction retardation Rth (550) of the laminate is 40 nm to 100 nm, preferably 60 nm to 80 nm. By setting the optical characteristics of the laminate in this manner, the viewing angle characteristics can be improved, and changes in display characteristics can be suppressed. In addition, a laminated body is obtained by laminating | stacking a 1st phase difference layer and a 2nd phase difference layer via arbitrary appropriate adhesive layers or adhesive bond layers.

A-5. Protective Film The protective film is formed of any suitable film that can be used as a protective layer of a polarizer. Specific examples of the material that is the main component of the film include cellulose-based resins such as triacetyl cellulose (TAC), polyester-based, polyvinyl alcohol-based, polycarbonate-based, polyamide-based, polyimide-based, polyether sulfone-based, and polysulfone-based Transparent resins such as polystyrenes, polynorbornenes, polyolefins, (meth) acrylics and acetates can be mentioned. In addition, thermosetting resins such as (meth) acrylic resins, urethane resins, (meth) acrylic urethane resins, epoxy resins, and silicone resins, ultraviolet curable resins, and the like can also be mentioned. Besides, for example, glassy polymers such as siloxane polymers can also be mentioned. Moreover, the polymer film as described in Unexamined-Japanese-Patent No. 2001-343529 (WO01 / 37007) can also be used. As a material of this film, for example, a resin composition containing a thermoplastic resin having a substituted or unsubstituted imide group in a side chain, and a thermoplastic resin having a substituted or unsubstituted phenyl group and a nitrile group in a side chain For example, a resin composition having an alternating copolymer of isobutene and N-methyl maleimide and an acrylonitrile / styrene copolymer can be mentioned. The polymer film may be, for example, an extrusion of the resin composition.

  The (meth) acrylic resin has a Tg (glass transition temperature) of preferably 115 ° C. or more, more preferably 120 ° C. or more, still more preferably 125 ° C. or more, particularly preferably 130 ° C. or more. It is because it is excellent in durability. The upper limit of the Tg of the (meth) acrylic resin is not particularly limited, but is preferably 170 ° C. or less from the viewpoint of formability and the like.

Any appropriate (meth) acrylic resin can be adopted as the above (meth) acrylic resin, as long as the effects of the present invention are not impaired. For example, poly (meth) acrylic acid esters such as polymethyl methacrylate, methyl methacrylate- (meth) acrylic acid copolymer, methyl methacrylate- (meth) acrylic acid ester copolymer, methyl methacrylate-acrylic acid ester -(Meth) acrylic acid copolymer, (meth) acrylic acid methyl styrene copolymer (MS resin etc.), polymer having an alicyclic hydrocarbon group (for example, methyl methacrylate-cyclohexyl methacrylate copolymer And methyl methacrylate- (meth) acrylic acid norbornyl copolymer and the like. Preferably, C _1-6 alkyl poly (meth) acrylates such as methyl poly (meth) acrylate are mentioned. More preferably, methyl methacrylate resin containing methyl methacrylate as a main component (50 to 100% by weight, preferably 70 to 100% by weight) is mentioned.

  Specific examples of the (meth) acrylic resin include, for example, (meth) acrylic resin having a ring structure in the molecule described in Acrippet VH or Acrypet VRL 20A manufactured by Mitsubishi Rayon Co., Ltd., and JP-A No. 2004-70296. Examples thereof include resins, and high Tg (meth) acrylic resins obtained by intramolecular crosslinking and intramolecular cyclization.

  Among the above (meth) acrylic resins, (meth) acrylic resins having a lactone ring structure are particularly preferable in that they have high heat resistance, high transparency, and high mechanical strength.

  Examples of the (meth) acrylic resin having a lactone ring structure include Japanese Patent Application Laid-Open Nos. 2000-230016, 2001-151814, 2002-120326, 2002-254544, and 2005. The (meth) acrylic resin which has a lactone ring structure as described in JP-A-146084 etc. is mentioned.

  The (meth) acrylic resin having a lactone ring structure preferably has a mass average molecular weight (sometimes referred to as a weight average molecular weight) of preferably 1000 to 2000000, more preferably 5000 to 1000000, still more preferably 10000 to 500,000, particularly Preferably, it is 50000 to 500,000.

  The (meth) acrylic resin having a lactone ring structure has a Tg (glass transition temperature) of preferably 115 ° C. or more, more preferably 125 ° C. or more, still more preferably 130 ° C. or more, particularly preferably 135 ° C., most preferably Is 140 ° C. or higher. It is because it is excellent in durability. The upper limit of the Tg of the (meth) acrylic resin having a lactone ring structure is not particularly limited, but is preferably 170 ° C. or less from the viewpoint of formability and the like.

  In the present specification, "(meth) acrylic" refers to acrylic and / or methacrylic.

  The protective film 20 (first protective film 21) disposed on the side opposite to each retardation layer with respect to the polarizer may have a surface such as hard coat treatment, anti-reflection treatment, anti-sticking treatment, anti-glare treatment, etc., as necessary. Processing may be performed. The thickness of the protective film (first protective film) is typically 5 mm or less, preferably 1 mm or less, more preferably 1 μm to 500 μm, and still more preferably 5 μm to 150 μm.

  The second protective film 22 disposed between the polarizer 10 and the first retardation layer 30 is preferably optically isotropic as described above. In the present specification, "optically isotropic" means that the in-plane retardation Re (550) is 0 nm to 10 nm, and the thickness direction retardation Rth (550) is -10 nm to +10 nm. Say. The optically anisotropic layer is, for example, a layer having an in-plane retardation Re (550) of more than 10 nm and / or a thickness direction retardation Rth (550) of less than −10 nm or more than 10 nm.

  The thickness of the second protective film is preferably 5 μm to 200 μm, more preferably 10 μm to 100 μm, and still more preferably 15 μm to 95 μm.

A-6. Others Any appropriate pressure-sensitive adhesive layer or adhesive layer is used to laminate the layers constituting the polarizing plate of the present invention. The pressure-sensitive adhesive layer is typically formed of an acrylic pressure-sensitive adhesive. The adhesive layer is typically formed of a polyvinyl alcohol adhesive.

  Although not shown, an adhesive layer may be provided on the second retardation layer 40 side of the polarizing plates 100 and 100 '. By providing the pressure-sensitive adhesive layer in advance, it can be easily attached to another optical member (for example, an organic EL panel). In addition, it is preferable that the peeling film is bonded together to the surface of this adhesive layer until it is used for use.

B. Manufacturing Method Any appropriate method may be employed as a method of manufacturing the polarizing plate. In one preferred embodiment, the longitudinal direction of the polarizer is conveyed while conveying the elongated polarizer having the absorption axis in the longitudinal direction and the elongated first or second retardation layer in the longitudinal direction. And laminating in the same direction as the longitudinal direction of the retardation layer to obtain a laminated film, while conveying the laminated film and the long second or first retardation layer in the longitudinal direction, And laminating the same so that the longitudinal direction of the laminated film and the longitudinal direction of the retardation layer are aligned. In addition, a long 1st phase difference layer and a long 2nd phase difference layer are laminated, a laminated phase difference film is produced, and this laminated phase difference film and a long light polarizer are You may manufacture by laminating | stacking. Here, the angle θ between the absorption axis of the polarizer 10 and the slow axis of the first retardation layer 30 preferably satisfies the relationship of 35 ° ≦ θ ≦ 55 ° as described above, and more preferably 38 ° ≦ θ ≦ 52 °, more preferably 39 ° ≦ θ ≦ 51 °.

  The elongated first retardation layer has a slow axis in the direction of the angle θ with respect to the longitudinal direction. According to such a configuration, as described above, roll-to-roll becomes possible in the manufacture of a polarizing plate, and the manufacturing process can be significantly shortened.

C. Organic EL Panel The organic EL panel of the present invention is provided with the above polarizing plate on the viewing side. The polarizing plates are laminated such that each retardation layer is on the organic EL panel side (ie, the polarizer is on the viewing side).

  EXAMPLES Hereinafter, the present invention will be specifically described by way of examples, but the present invention is not limited by these examples. In addition, the measuring method of each characteristic is as follows.

(1) Thickness It measured using the dial gauge (The product made by PEACOCK, product name "DG-205", a dial gauge stand (product name "pds-2")).
(2) Retardation The sample of 50 mm x 50 mm was cut out from each retardation layer, and it measured using a measurement sample and Axoscan made from Axometrics. The measurement wavelengths were 450 nm and 550 nm, and the measurement temperature was 23 ° C.
Further, the average refractive index was measured using an Abbe refractometer manufactured by Atago Co., and refractive indexes nx, ny and nz were calculated from the obtained retardation values.
(3) Variation of Retardation by Environmental Test A sample was cut out of the retardation film to 50 mm × 50 mm, and the retardation was measured by Axoscan. Thereafter, the sample was allowed to stand in a constant temperature and humidity chamber at 40 ° C. and 90% RH for 100 hours, and then the phase difference was measured to evaluate by determining the difference in phase difference before and after the environmental test.
(4) Water absorption rate It measured based on "the water absorption rate of a plastic, and the boiling water absorption rate test method" of JISK7209. The size of the test piece was a square of 50 mm side, and was obtained by submerging the test piece in water having a water temperature of 25 ° C. for 24 hours, and then measuring the weight change before and after the water immersion. The unit is%.
(5) Reflected Hue A black image was displayed on the obtained organic EL panel, and the reflected hue was measured using a viewing angle measurement and evaluation apparatus conoscope manufactured by Auoronic-MERCHERS.

Example 1
(Preparation of polycarbonate resin film)
37.5 parts by mass of isosorbide (ISB), 91.5 parts by mass of 9,9- [4- (2-hydroxyethoxy) phenyl] fluorene (BHEPF), 8.4 parts by mass of polyethylene glycol (PEG) having an average molecular weight of 400, First, 105.7 parts by mass of diphenyl carbonate (DPC) and 0.594 parts by mass of cesium carbonate (0.2 mass% aqueous solution) as a catalyst are charged into a reaction vessel, and the first stage of the reaction is performed under a nitrogen atmosphere. As a process of step 2, the heating medium temperature of the reaction vessel was brought to 150 ° C., and the raw materials were dissolved while stirring as needed (about 15 minutes).

Subsequently, the pressure in the reaction vessel was changed from normal pressure to 13.3 kPa, and while the temperature of the heat medium in the reaction vessel was raised to 190 ° C. in one hour, the generated phenol was extracted out of the reaction vessel.
After holding the temperature in the reaction vessel at 190 ° C. for 15 minutes, as the second step, the pressure in the reaction vessel is set to 6.67 kPa, and the heat medium temperature in the reaction vessel is raised to 230 ° C. in 15 minutes, The generated phenol was withdrawn out of the reaction vessel. Since the stirring torque of the stirrer increased, the temperature was raised to 250 ° C. in 8 minutes, and the pressure in the reaction vessel was reduced to 0.200 kPa or less in order to remove the generated phenol. After reaching a predetermined stirring torque, the reaction is terminated, and the formed reaction product is extruded into water and then pelletized to obtain BHEPF / ISB / PEG = 42.9 mol% / 52.8 mol% / 4.3. Polycarbonate resin A containing a structural unit derived from a dihydroxy compound in a proportion of mol% was obtained.
The glass transition temperature of the obtained polycarbonate resin A was 126 ° C., and the reduced viscosity was 0.372 dL / g.

The obtained polycarbonate resin A is vacuum dried at 80 ° C. for 5 hours, and then a single-screw extruder (made by Isuzu Kako Co., screw diameter 25 mm, cylinder set temperature: 220 ° C.), T-die (width 300 mm, set temperature: A polycarbonate resin film having a length of 3 m, a width of 300 mm, and a thickness of 120 μm was produced using a film forming apparatus equipped with a temperature of 220 ° C., a chill roll (setting temperature: 120 to 130 ° C.) and a winding machine.
The water absorption of the obtained polycarbonate resin film was 1.2%.

(Preparation of first retardation layer)
The obtained polycarbonate resin film was cut out into a length of 300 mm and a width of 300 mm, and longitudinally stretched at a temperature of 136 ° C. and a magnification of 2 times using Labo Stretcher KARO IV (manufactured by Bruckner) to obtain a retardation film .
The Re (550) of the obtained retardation film is 141 nm, the Rth (550) is 141 nm (nx: 1.5969, ny: 1.5942, nz: 1.5942), and the refractive index of nx> ny = nz The characteristics are shown. Moreover, Re (450) / Re (550) of the obtained retardation film was 0.89. Furthermore, the phase difference fluctuation | variation by an environmental test was 5 nm.

(Preparation of second retardation layer)
20 parts by weight of a side chain-type liquid crystal polymer represented by the following chemical formula (I) (numbers 65 and 35 in the formula indicate mole% of monomer units and is represented by a block polymer for convenience: weight average molecular weight 5000) 80 parts by weight of a polymerizable liquid crystal (manufactured by BASF: trade name: Paliocolor LC 242) exhibiting a nematic liquid crystal phase and 5 parts by weight of a photopolymerization initiator (Cibas Specialty Chemicals: trade name: Irgacure 907) dissolved in 200 parts by weight of cyclopentanone Thus, a liquid crystal coating liquid was prepared. Then, the coating solution is applied to a substrate film (a norbornene resin film: manufactured by Nippon Zeon Co., Ltd., trade name “Zonex”) by a bar coater, and then the liquid crystal is dried by heating at 80 ° C. for 4 minutes. It was oriented. The liquid crystal layer was irradiated with ultraviolet rays to cure the liquid crystal layer, whereby a liquid crystal solidified layer (thickness: 0.58 μm) to be a second retardation layer was formed on the substrate. This layer has a Re (550) of 0 nm and an Rth (550) of -71 nm (nx: 1.5326, ny: 1.5326, nz: 1.6550), exhibiting a refractive index characteristic of nz> nx = ny The

(Preparation of laminate)
After the liquid crystal solidified layer (second retardation layer) is bonded to the retardation film (first retardation layer) via an acrylic pressure-sensitive adhesive, the base film is removed to obtain a retardation. A laminate in which the liquid crystal solidified layer was transferred to the film was obtained.
The Re (550) of the obtained laminate was 141 nm and the Rth (550) was 70 nm.

(Preparation of polarizer)
The polyvinyl alcohol film was dyed in an aqueous solution containing iodine, and then uniaxially stretched 6 times between rolls having different speed ratios in an aqueous solution containing boric acid to obtain a polarizer.

(Preparation of polarizing plate)
A triacetyl cellulose film (thickness 40 μm, manufactured by Konica Minolta, trade name “KC4UYW”) was attached to one side of the above-mentioned polarizer via a polyvinyl alcohol-based adhesive.
The above retardation film was bonded to the other side of the polarizer via a polyvinyl alcohol adhesive. Here, the retardation films were laminated such that the slow axis of the retardation film was 45 ° counterclockwise with respect to the absorption axis of the polarizer. Next, the liquid crystal solidified layer was attached to the retardation film side via an acrylic pressure-sensitive adhesive, and then the base film was removed to obtain a polarizing plate.

(Preparation of organic EL panel)
A pressure-sensitive adhesive layer was formed with an acrylic pressure-sensitive adhesive on the liquid crystal solidified layer (second retardation layer) side of the obtained polarizing plate, and cut into a size of 50 mm × 50 mm.
Take out the organic EL panel from the organic EL display (product name "15EL9500" manufactured by LG Co., Ltd.), peel off the polarizing film attached to this organic EL panel, and instead, stick out the cut out polarizing plate to make the organic EL I got a panel.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1. In Table 1, “viewing angle characteristics” refers to the reflection hue in the front direction and the reflection hue in the oblique direction (maximum value or minimum value at a polar angle of 45 °) on the xy chromaticity diagram of the CIE color system. The distance between two points Δxy is shown. Further, “change in frontal hue Δxy” and “change in oblique hue Δxy” indicate a change in reflected hue before and after the environmental test is put in place.

Example 2
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer) and liquid crystal solidified layer (second retardation layer) were used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(Preparation of first retardation layer)
A retardation film was obtained in the same manner as in Example 1 except that the draw ratio was 1.85.
The Re (550) of the obtained retardation film is 120 nm, the Rth (550) is 120 nm (nx: 1.5967, ny: 1.5944, nz: 1.5944), and the refractive index of nx> ny = nz The characteristics are shown. Moreover, Re (450) / Re (550) of the obtained retardation film was 0.89. Furthermore, the phase difference fluctuation | variation by an environmental test was 5 nm.

(Preparation of second retardation layer)
Thickness: The liquid crystal solidified layer was obtained in the same manner as in Example 1 except that the thickness was adjusted to 0.66 μm.
The Re (550) of the obtained liquid crystal solidified layer is 0 nm, the Rth (550) is -80 nm (nx: 1.5339, ny: 1.5339, nz: 1.6551), and nz> nx = ny The rate characteristic is shown.

(Preparation of laminate)
A laminate was obtained in the same manner as in Example 1 except that the above retardation film and liquid crystal solidified layer were used.
The Re (550) of the obtained laminate was 120 nm, and the Rth (550) was 40 nm.

[Example 3]
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer) and liquid crystal solidified layer (second retardation layer) were used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(Preparation of first retardation layer)
A retardation film was obtained in the same manner as Example 1, except that the draw ratio was 2.1.
The Re (550) of the obtained retardation film is 160 nm, Rth (550) is 160 nm (nx: 1.5971, ny: 1.5940, nz: 1.5940), and the refractive index of nx> ny = nz The characteristics are shown. Moreover, Re (450) / Re (550) of the obtained retardation film was 0.89. Furthermore, the phase difference fluctuation | variation by an environmental test was 5 nm.

(Preparation of second retardation layer)
The liquid crystal solidified layer was obtained in the same manner as in Example 1 except that the thickness was adjusted to 0.49 μm.
The Re (550) of the obtained liquid crystal solidified layer is 0 nm, Rth (550) is −60 nm, and the refractive index is nz> nx = ny (nx: 1.5325, ny: 1.5325, nz: 1.6549) The rate characteristic is shown.

(Preparation of laminate)
A laminate was obtained in the same manner as in Example 1 except that the above retardation film and liquid crystal solidified layer were used.
The Re (550) of the obtained laminate was 160 nm and the Rth (550) was 100 nm.

Example 4
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer) was used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(First retardation layer)
A commercially available retardation film (manufactured by Teijin Ltd., trade name "Pure Ace WR (EWF)") was used as it was. This film had a Re (550) of 147 nm and an Rth (550) of 147 nm (nx: 1.5970, ny: 1.5942, nz: 1.5942) and exhibited a refractive index characteristic of nx> ny = nz . Moreover, Re (450) / Re (550) of the obtained retardation film was 0.89. Furthermore, the water absorption rate was 0.5%, and the phase difference fluctuation by the environmental test was 5 nm.

(Preparation of laminate)
A laminate was obtained in the same manner as in Example 1 except that the above retardation film was used.
The Re (550) of the obtained laminate was 147 nm and the Rth (550) was 76 nm.

[Example 5]
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer) was used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(First retardation layer)
By the procedure according to Example 1, a polycarbonate resin B containing a structural unit derived from a dihydroxy compound was obtained at a ratio of BHEPF / ISB / PEG (average molecular weight 1000) = 45 mol% / 51 mol% / 4 mol%. The glass transition temperature of the obtained polycarbonate resin B was 134.1 ° C. A polycarbonate resin film was produced in the same manner as in Example 1 except that this polycarbonate resin B was used. The water absorption of the obtained polycarbonate resin film was 2.1%.
A retardation film (first retardation layer) was obtained in the same manner as in Example 1 except that this polycarbonate resin film was used and longitudinal stretching was performed at a draw ratio of 1.5. The Re (550) of the obtained retardation film was 141 nm, the Rth (550) was 141 nm, and a refractive index characteristic of nx> ny = nz was exhibited. Moreover, Re (450) / Re (550) of the obtained retardation film was 0.98. Furthermore, the phase difference fluctuation | variation by an environmental test was 5 nm.

(Preparation of laminate)
A laminate was obtained in the same manner as in Example 1 except that the above retardation film was used.
The Re (550) of the obtained laminate was 141 nm and the Rth (550) was 70 nm.

Comparative Example 1
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer) and liquid crystal cured layer (second retardation layer) were used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(First retardation layer)
The cellulose ester film (water absorption: 3.2%) of Example 1 of JP-A-2005-42039 was prepared using Lab Stretcher KARO IV (manufactured by Bruckner) at a temperature of 100 ° C. and a magnification of 1.3 times. Simultaneous biaxial stretching was performed to obtain a retardation film.
The Re (550) of the obtained retardation film is 0 nm, the Rth (550) is 141 nm (nx: 1.4912, ny: 1.4912, nz: 1.4877), and the refractive index of nx = ny> nz The characteristics are shown. In addition, the water absorption rate was 3.2%, and the phase difference fluctuation by the environmental test was 15 nm.

(Preparation of second retardation layer)
100 parts by weight of a liquid crystal compound [Dainippon Ink and Chemicals, Inc., trade name "UCL-001", and 3 weight of a photopolymerization initiator [Ciba Specialty Chemicals, trade name "Irgacure 907"] A solution was prepared by dissolving in 200 parts by weight of a cyclopentanone (boiling point 131 ° C.) a liquid crystalline composition obtained by mixing 0.05 parts by weight of a part and a leveling agent [Bikk Chemie, trade name “BYK 361”]. Next, on the surface of a commercially available polyethylene terephthalate film [manufactured by Toray Industries, Inc., trade name "S-27E" (thickness: 75 μm)], a commercially available polyvinyl alcohol [manufactured by Japan Synthetic Chemical Industry Co., Ltd., trade name "NH-18" ]], Apply uniformly in one direction using a rod coater, dry for 5 minutes in an air circulating thermostatic oven at 80 ° C 70 ° C ± 1 ° C, and then apply a rubbing cloth with nylon pile yarn Using an attached cylindrical roller, Rabbin treatment (rotational speed 1000 r.p.m., pushing amount 0.30 mm, moving speed 60 mm / sec) was performed to obtain an alignment substrate. The prepared liquid crystal solution is coated on the surface of the obtained alignment substrate using a rod coater, dried for 3 minutes in an air circulating constant temperature oven at 90 ° C. ± 1 ° C., coated and dried The composition was cured by UV irradiation to form a cured layer of a liquid crystalline composition aligned in homogeneous alignment.
Re (550) of the obtained hardened layer is 141 nm, Rth (550) is 141 nm, and refractive index characteristics of nx> ny = nz (nx: 1.4916, ny: 1.4893, nz: 1.4893) showed that.

(Preparation of laminate)
A laminate was obtained in the same manner as in Example 1 except that the above retardation film and the cured liquid crystal layer were used.
The Re (550) of the obtained laminate was 141 nm, and the Rth (550) was 282 nm.

Comparative Example 2
An organic EL panel was produced in the same manner as in Example 1 except that the second retardation layer was not used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

Comparative Example 3
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer) was used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(Preparation of first retardation layer)
5.0 g of PVA having a degree of polymerization of 1800 dried at 105 ° C. for 2 hours (Japan Synthetic Chemical, NH-18) was dissolved in 95 ml of DMSO. Thereto, 3.78 g of mesitaldehyde, 1.81 g of propionaldehyde and 1.77 g of p-toluenesulfonic acid monohydrate were added and stirred at 40 ° C. for 4 hours. Reprecipitation was performed in a water / methanol = 2/1 solution in which 2.35 g of sodium hydrogen carbonate was dissolved. The polymer obtained by filtration was dissolved in THF and reprecipitated in diethyl ether. After filtration and drying, 7.89 g of a white polymer was obtained. When the obtained polymer was measured under the above measurement conditions, the molar ratio of each portion of vinyl mesital, vinyl propional, and vinyl alcohol was 22:46:32, and the polymer having a structure represented by the following chemical formula (II) was It was obtained. Moreover, the glass transition temperature of this polymer was 102 ° C. The obtained polymer was dissolved in DMF and formed into a film using an applicator. The film obtained by drying was stretched 1.8 times at 110 ° C. using a stretching machine to obtain a uniaxially stretched film with a thickness of 85 μm.
The obtained film had a Re (550) of 141 nm, an Rth (550) of 141 nm (nx: 1.5969, ny: 1.5942, nz: 1.5942), and a refractive index characteristic of nx> ny = nz. Indicated. Moreover, Re (450) / Re (550) of the obtained retardation film was 0.89. Furthermore, the water absorption was 4.9%, and the phase difference fluctuation by the environmental test was 20 nm.

(Preparation of laminate)
A laminate was obtained in the same manner as in Example 1 except that the above retardation film was used.
The Re (550) of the obtained laminate was 141 nm and the Rth (550) was 70 nm.

Comparative Example 4
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer) and liquid crystal solidified layer (second retardation layer) were used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(Preparation of first retardation layer)
A retardation film was obtained in the same manner as in Example 1 except that the stretching ratio was 1.82.
The Re (550) of the obtained retardation film is 115 nm, Rth (550) is 115 nm (nx: 1.5966, ny: 1.5944, nz: 1.5944), and the refractive index of nx> ny = nz The characteristics are shown. Moreover, Re (450) / Re (550) of the obtained retardation film was 0.89. Furthermore, the phase difference fluctuation | variation by an environmental test was 5 nm.

(Preparation of second retardation layer)
Thickness: A liquid crystal solidified layer was obtained in the same manner as in Example 1 except that the thickness was adjusted to 0.7 μm.
Re (550) of the obtained liquid crystal solidified layer is 0 nm, Rth (550) is −85 nm (nx: 1.5338, ny: 1.5338, nz: 1.6552), and nz> nx = ny The rate characteristic is shown.

(Preparation of laminate)
A laminate was obtained in the same manner as in Example 1 except that the above retardation film and liquid crystal solidified layer were used.
The Re (550) of the obtained laminate was 115 nm, and the Rth (550) was 30 nm.

Comparative Example 5
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer) and liquid crystal solidified layer (second retardation layer) were used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(Preparation of first retardation layer)
A retardation film was obtained in the same manner as in Example 1 except that the stretching ratio was 2.13.
The Re (550) of the obtained retardation film is 170 nm, the Rth (550) is 170 nm (nx: 1.5972, ny: 1.5939, nz: 1.5939), and the refractive index of nx> ny = nz The characteristics are shown. Moreover, Re (450) / Re (550) of the obtained retardation film was 0.89. Furthermore, the phase difference fluctuation | variation by an environmental test was 5 nm.

(Preparation of second retardation layer)
The liquid crystal solidified layer was obtained in the same manner as in Example 1 except that the thickness was adjusted to 0.49 μm.
The Re (550) of the obtained liquid crystal solidified layer is 0 nm, Rth (550) is −60 nm, and the refractive index is nz> nx = ny (nx: 1.5325, ny: 1.5325, nz: 1.6549) The rate characteristic is shown.

(Preparation of laminate)
A laminate was obtained in the same manner as in Example 1 except that the above retardation film and liquid crystal solidified layer were used.
The Re (550) of the obtained laminate was 170 nm and the Rth (550) was 110 nm.

[Example 6]
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer and second retardation layer) was used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(Preparation of first retardation layer)
A retardation film was obtained in the same manner as in Example 1 except that the stretching ratio was 1.7.
The Re (550) of the obtained retardation film was 100 nm, the Rth (550) was 100 nm, and a refractive index characteristic of nx> ny = nz was exhibited. Moreover, Re (450) / Re (550) of the obtained retardation film was 0.89. Furthermore, the phase difference fluctuation | variation by an environmental test was 5 nm.

(Preparation of second retardation layer)
In a 30 liter autoclave, 18 kg of distilled water containing 0.2% by weight of partially saponified polyvinyl alcohol, 3 kg of diisopropyl fumarate, 7 g of dimethyl-2,2'-azobisisobutyrate as a polymerization initiator, and charging temperature Suspension radical polymerization was carried out under the conditions of 50 ° C. and 24 hours of polymerization time. The particles obtained were filtered, washed thoroughly with methanol and then dried at 80 ° C. to obtain a diisopropyl fumarate homopolymer. The obtained diisopropyl fumarate homopolymer is dissolved in a THF solution to make a 22% solution, and tris (2,4-di-) as a hindered phenol-based antioxidant is further added to 100 parts by weight of the diisopropyl fumarate homopolymer. 0.35 parts by weight of t-butylphenyl) phosphite and 0.15 parts by weight of pentaerythritol-tetrakis (3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate) as a phosphorus-based antioxidant, After adding 1 part by weight of 2- (2H-benzotriazol-2-yl) -p-cresol as a UV absorber, the solution is cast on a supporting substrate of a solution casting apparatus by a T-die method at 40 ° C, 80 ° C and A film of 20.7 μm in thickness was obtained which was dried at 120 ° C. for 15 minutes each.
The obtained film is cut out into a length of 300 mm and a width of 300 mm, and the free end longitudinal stretching is performed at a temperature of 150 ° C. and a magnification of 1.05 times using Lab Stretcher KARO IV (Bruckner) to obtain a retardation film Obtained.
Re (550) of the obtained retardation film was 20 nm, Rth (550) was -60 nm, and it showed the refractive index characteristic of nz>nx> ny.

(Preparation of laminate)
Example 1 except that each of the retardation films described above was used, and the slow axis of the first retardation layer and the slow axis of the second retardation layer were substantially parallel. A laminate was obtained in the same manner as in.
The Re (550) of the obtained laminate was 120 nm, and the Rth (550) was 40 nm.

[Example 7]
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer and second retardation layer) was used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(First retardation layer)
The retardation film produced in Example 1 was used.

(Preparation of second retardation layer)
A retardation film was obtained in the same manner as in Example 6 except that the thickness was 14.8 μm. Re (550) of the obtained retardation film was 20 nm, Rth (550) was -40 nm, and it showed the refractive index characteristic of nz>nx> ny.

(Preparation of laminate)
Example 1 and Example 1 except that each of the retardation films described above was used and that the slow axis of the first retardation layer and the slow axis of the second retardation layer were substantially orthogonal to each other A laminate was obtained in the same manner.
The Re (550) of the obtained laminate was 120 nm, and the Rth (550) was 100 nm.

[Example 8]
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer and second retardation layer) was used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(First retardation layer)
The retardation film produced in Example 1 was used.

(Preparation of second retardation layer)
A retardation film was obtained in the same manner as in Example 6 except that the thickness was 14.8 μm. Re (550) of the obtained retardation film was 20 nm, Rth (550) was -40 nm, and it showed the refractive index characteristic of nz>nx> ny.

(Preparation of laminate)
Example 1 except that each of the retardation films described above was used, and the slow axis of the first retardation layer and the slow axis of the second retardation layer were substantially parallel. A laminate was obtained in the same manner as in.
The Re (550) of the obtained laminate was 160 nm and the Rth (550) was 100 nm.

[Example 9]
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer and second retardation layer) was used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(Preparation of first retardation layer)
A retardation film was obtained in the same manner as in Example 1 except that the stretching ratio was 2.2.
The Re (550) of the obtained retardation film was 170 nm, the Rth (550) was 170 nm, and a refractive index characteristic of nx> ny = nz was exhibited. Moreover, Re (450) / Re (550) of the obtained retardation film was 0.89. Furthermore, the phase difference fluctuation | variation by an environmental test was 5 nm.

(Preparation of second retardation layer)
A retardation film was obtained in the same manner as Example 6, except that the draw ratio was 1.025 and the thickness was 40 μm. Re (550) of the obtained retardation film was 10 nm, Rth (550) was -130 nm, and it showed the refractive index characteristic of nz>nx> ny.

(Preparation of laminate)
Example 1 and Example 1 except that each of the retardation films described above was used and that the slow axis of the first retardation layer and the slow axis of the second retardation layer were substantially orthogonal to each other A laminate was obtained in the same manner.
The Re (550) of the obtained laminate was 160 nm and the Rth (550) was 40 nm.

[Example 10]
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer and second retardation layer) was used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(Preparation of first retardation layer)
The commercially available retardation film used in Example 4 is subjected to fixed-end stretching at a stretching temperature of 190 ° C. (MD stretch ratio 0.85 times, TD stretch ratio 1.1 times), and the first retardation layer retardation I got a film.
The Re (550) of the obtained retardation film was 100 nm, the Rth (550) was 100 nm, and a refractive index characteristic of nx> ny = nz was exhibited. Moreover, Re (450) / Re (550) of the obtained retardation film was 0.89. Furthermore, the phase difference fluctuation | variation by an environmental test was 5 nm.

(Second retardation layer)
The retardation film produced in Example 6 was used.

(Preparation of laminate)
Example 1 except that each of the retardation films described above was used, and the slow axis of the first retardation layer and the slow axis of the second retardation layer were substantially parallel. A laminate was obtained in the same manner as in.
The Re (550) of the obtained laminate was 120 nm, and the Rth (550) was 40 nm.

[Example 11]
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer and second retardation layer) was used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(Preparation of first retardation layer)
The commercially available retardation film used in Example 4 was stretched at a stretching temperature of 190 ° C. and a stretching ratio of 1.2 times to obtain a first retardation film for retardation layer.
The Re (550) of the obtained retardation film was 170 nm, the Rth (550) was 170 nm, and a refractive index characteristic of nx> ny = nz was exhibited. Moreover, Re (450) / Re (550) of the obtained retardation film was 0.89. Furthermore, the phase difference fluctuation | variation by an environmental test was 5 nm.

(Preparation of second retardation layer)
A retardation film was obtained in the same manner as Example 6, except that the draw ratio was 1.025 and the thickness was 40 μm. Re (550) of the obtained retardation film was 10 nm, Rth (550) was -130 nm, and it showed the refractive index characteristic of nz>nx> ny.

(Preparation of laminate)
Example 1 and Example 1 except that each of the retardation films described above was used and that the slow axis of the first retardation layer and the slow axis of the second retardation layer were substantially orthogonal to each other A laminate was obtained in the same manner.
The Re (550) of the obtained laminate was 160 nm and the Rth (550) was 40 nm.

Comparative Example 6
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer and second retardation layer) was used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(Preparation of first retardation layer)
A retardation film was obtained in the same manner as in Example 1 except that the stretching ratio was 1.6.
The Re (550) and the Rth (550) of the obtained retardation film were 90 nm and 90 nm, respectively, and exhibited a refractive index characteristic of nx> ny = nz. Moreover, Re (450) / Re (550) of the obtained retardation film was 0.89. Furthermore, the phase difference fluctuation | variation by an environmental test was 5 nm.

(Second retardation layer)
The retardation film produced in Example 6 was used.

(Preparation of laminate)
Example 1 except that each of the retardation films described above was used, and the slow axis of the first retardation layer and the slow axis of the second retardation layer were substantially parallel. A laminate was obtained in the same manner as in.
The Re (550) of the obtained laminate was 110 nm, and the Rth (550) was 30 nm.

Comparative Example 7
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer and second retardation layer) was used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(Preparation of first retardation layer)
A retardation film was obtained in the same manner as in Example 1 except that the stretching ratio was changed to 2.3 times.
The Re (550) of the obtained retardation film was 180 nm, the Rth (550) was 180 nm, and a refractive index characteristic of nx> ny = nz was exhibited. Moreover, Re (450) / Re (550) of the obtained retardation film was 0.89. Furthermore, the phase difference fluctuation | variation by an environmental test was 5 nm.

(Preparation of second retardation layer)
A retardation film was obtained in the same manner as Example 6, except that the draw ratio was 1.025 and the thickness was 40 μm. Re (550) of the obtained retardation film was 10 nm, Rth (550) was -130 nm, and it showed the refractive index characteristic of nz>nx> ny.

(Preparation of laminate)
Example 1 and Example 1 except that each of the retardation films described above was used and that the slow axis of the first retardation layer and the slow axis of the second retardation layer were substantially orthogonal to each other A laminate was obtained in the same manner.
The Re (550) of the obtained laminate was 170 nm and the Rth (550) was 50 nm.

Comparative Example 8
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer and second retardation layer) was used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(Preparation of first retardation layer)
A retardation film was obtained in the same manner as in Comparative Example 1 except that the free end stretching was performed at a draw ratio of 1.2 times.
The Re (550) of the obtained retardation film was 100 nm, the Rth (550) was 100 nm, and a refractive index characteristic of nx> ny = nz was exhibited. Moreover, the water absorption of the obtained retardation film was 3.2%, and the phase difference fluctuation | variation by an environmental test was 15 nm.

(Second retardation layer)
The retardation film produced in Example 6 was used.

(Preparation of laminate)
Example 1 except that each of the retardation films described above was used, and the slow axis of the first retardation layer and the slow axis of the second retardation layer were substantially parallel. A laminate was obtained in the same manner as in.
The Re (550) of the obtained laminate was 120 nm, and the Rth (550) was 40 nm.

Comparative Example 9
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer and second retardation layer) was used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(Preparation of first retardation layer)
A retardation film was obtained in the same manner as in Comparative Example 3 except that the stretching ratio was 1.28.
The Re (550) of the obtained retardation film was 100 nm, the Rth (550) was 100 nm, and a refractive index characteristic of nx> ny = nz was exhibited. Moreover, the water absorption of the obtained retardation film was 4.9%, and the phase difference fluctuation | variation by an environmental test was 20 nm.

(Second retardation layer)
The retardation film produced in Example 6 was used.

(Preparation of laminate)
Example 1 except that each of the retardation films described above was used, and the slow axis of the first retardation layer and the slow axis of the second retardation layer were substantially parallel. A laminate was obtained in the same manner as in.
The Re (550) of the obtained laminate was 120 nm, and the Rth (550) was 40 nm.

[Example 12]
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer) and liquid crystal solidified layer (second retardation layer) were used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(Preparation of first retardation layer)
A retardation film was obtained in the same manner as in Example 1 except that the stretching ratio was 2.2.
The Re (550) and Rth (550) of the obtained retardation film were 120 nm and 130 nm, respectively, and exhibited a refractive index characteristic of nx>ny> nz. Moreover, Re (450) / Re (550) of the obtained retardation film was 0.89. Furthermore, the phase difference fluctuation | variation by an environmental test was 5 nm.

(Preparation of second retardation layer)
Thickness: A liquid crystal solidified layer was obtained in the same manner as in Example 1 except that the thickness was adjusted to 0.75 μm.
The Re (550) of the obtained liquid crystal solidified layer was 0 nm, the Rth (550) was −90 nm, and a refractive index characteristic of nz> nx = ny was exhibited.

(Preparation of laminate)
A laminate was obtained in the same manner as in Example 1 except that the above retardation film and liquid crystal solidified layer were used.
The Re (550) of the obtained laminate was 120 nm, and the Rth (550) was 40 nm.

[Example 13]
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer) and liquid crystal solidified layer (second retardation layer) were used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(First retardation layer)
The retardation film produced in Example 12 was used.

(Preparation of second retardation layer)
Thickness: A liquid crystal solidified layer was obtained in the same manner as in Example 1 except that the thickness was adjusted to 0.25 μm.
The Re (550) of the obtained liquid crystal solidified layer was 0 nm, the Rth (550) was -30 nm, and a refractive index characteristic of nz> nx = ny was exhibited.

(Preparation of laminate)
A laminate was obtained in the same manner as in Example 1 except that the above retardation film and liquid crystal solidified layer were used.
The Re (550) of the obtained laminate was 120 nm, and the Rth (550) was 100 nm.

Example 14
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer) and liquid crystal solidified layer (second retardation layer) were used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(Preparation of first retardation layer)
After free-end stretching at a MD stretching ratio of 3.2, a retardation film was obtained in the same manner as in Example 1, except that a fixed-end stretching was performed at a TD stretching ratio of 1.5.
The Re (550) and Rth (550) of the obtained retardation film were 160 nm and 380 nm, respectively, and exhibited a refractive index characteristic of nx>ny> nz. Moreover, Re (450) / Re (550) of the obtained retardation film was 0.89. Furthermore, the phase difference fluctuation | variation by an environmental test was 5 nm.

(Preparation of second retardation layer)
Thickness: A liquid crystal solidified layer was obtained in the same manner as in Example 1 except that the thickness was adjusted to 2.31 μm.
The Re (550) of the obtained liquid crystal solidified layer was 0 nm, the Rth (550) was −280 nm, and a refractive index characteristic of nz> nx = ny was exhibited.

(Preparation of laminate)
A laminate was obtained in the same manner as in Example 1 except that the above retardation film and liquid crystal solidified layer were used.
The Re (550) of the obtained laminate was 160 nm and the Rth (550) was 100 nm.

[Example 15]
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer) and liquid crystal solidified layer (second retardation layer) were used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(Preparation of first retardation layer)
A retardation film was obtained in the same manner as in Example 1 except that the stretching ratio was 2.6 times.
The Re (550) and the Rth (550) of the obtained retardation film were 160 nm and 170 nm, respectively, and exhibited a refractive index characteristic of nx>ny> nz. Moreover, Re (450) / Re (550) of the obtained retardation film was 0.89. Furthermore, the phase difference fluctuation | variation by an environmental test was 5 nm.

(Preparation of second retardation layer)
Thickness: A liquid crystal solidified layer was obtained in the same manner as in Example 1 except that the thickness was adjusted to 1.07 μm.
The Re (550) of the obtained liquid crystal solidified layer was 0 nm, the Rth (550) was -130 nm, and a refractive index characteristic of nz> nx = ny was exhibited.

(Preparation of laminate)
A laminate was obtained in the same manner as in Example 1 except that the above retardation film and liquid crystal solidified layer were used.
The Re (550) of the obtained laminate was 160 nm and the Rth (550) was 40 nm.

[Example 16]
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer) and liquid crystal solidified layer (second retardation layer) were used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(Preparation of first retardation layer)
After the commercially available retardation film used in Example 4 is simultaneously biaxially stretched (MD stretching ratio 0.85 times, TD stretching ratio 1.1 times) at a stretching temperature of 190 ° C., fixed end stretching (MD stretching ratio 1) 1) to obtain a first retardation film for retardation layer.
The Re (550) and Rth (550) of the obtained retardation film were 120 nm and 130 nm, respectively, and exhibited a refractive index characteristic of nx>ny> nz. Moreover, Re (450) / Re (550) of the obtained retardation film was 0.89. Furthermore, the phase difference fluctuation | variation by an environmental test was 5 nm.

(Preparation of second retardation layer)
Thickness: A liquid crystal solidified layer was obtained in the same manner as in Example 4 except that the thickness was adjusted to 0.75 μm.
The Re (550) of the obtained liquid crystal solidified layer was 0 nm, the Rth (550) was −90 nm, and a refractive index characteristic of nz> nx = ny was exhibited.

(Preparation of laminate)
A laminate was obtained in the same manner as in Example 1 except that the above retardation film and liquid crystal solidified layer were used.
The Re (550) of the obtained laminate was 120 nm, and the Rth (550) was 40 nm.

[Example 17]
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer) and liquid crystal solidified layer (second retardation layer) were used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(Preparation of first retardation layer)
The commercially available retardation film used in Example 4 was subjected to fixed-end stretching (stretching ratio 1.2 times) at a stretching temperature of 190 ° C. to obtain a first retardation film for retardation layer.
The Re (550) and the Rth (550) of the obtained retardation film were 160 nm and 170 nm, respectively, and exhibited a refractive index characteristic of nx>ny> nz. Moreover, Re (450) / Re (550) of the obtained retardation film was 0.89. Furthermore, the phase difference fluctuation | variation by an environmental test was 5 nm.

(Preparation of second retardation layer)
Thickness: A liquid crystal solidified layer was obtained in the same manner as in Example 4 except that the thickness was adjusted to 1.07 μm.
The Re (550) of the obtained liquid crystal solidified layer was 0 nm, the Rth (550) was -130 nm, and a refractive index characteristic of nz> nx = ny was exhibited.

(Preparation of laminate)
A laminate was obtained in the same manner as in Example 1 except that the above retardation film and liquid crystal solidified layer were used.
The Re (550) of the obtained laminate was 160 nm and the Rth (550) was 40 nm.

Comparative Example 10
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer) and liquid crystal solidified layer (second retardation layer) were used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(Preparation of first retardation layer)
A retardation film was obtained in the same manner as in Example 1 except that the draw ratio was 2.25.
The Re (550) and the Rth (550) of the obtained retardation film were 130 nm and 141 nm, respectively, and exhibited a refractive index characteristic of nx>ny> nz. Moreover, Re (450) / Re (550) of the obtained retardation film was 0.89. Furthermore, the phase difference fluctuation | variation by an environmental test was 5 nm.

(Preparation of second retardation layer)
Thickness: A liquid crystal solidified layer was obtained in the same manner as in Example 1 except that the thickness was adjusted to 0.25 μm.
The Re (550) of the obtained liquid crystal solidified layer was 0 nm, the Rth (550) was -30 nm, and a refractive index characteristic of nz> nx = ny was exhibited.

(Preparation of laminate)
A laminate was obtained in the same manner as in Example 1 except that the above retardation film and liquid crystal solidified layer were used.
The Re (550) of the obtained laminate was 130 nm and the Rth (550) was 111 nm.

Comparative Example 11
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer) and liquid crystal solidified layer (second retardation layer) were used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(Preparation of first retardation layer)
A retardation film was obtained in the same manner as in Example 1 except that the stretching ratio was 2.5 times.
The Re (550) and Rth (550) of the obtained retardation film were 150 nm and 181 nm, respectively, and exhibited a refractive index characteristic of nx>ny> nz. Moreover, Re (450) / Re (550) of the obtained retardation film was 0.89. Furthermore, the phase difference fluctuation | variation by an environmental test was 5 nm.

(Preparation of second retardation layer)
Thickness: A liquid crystal solidified layer was obtained in the same manner as in Example 1 except that the thickness was adjusted to 1.33 μm.
The Re (550) of the obtained liquid crystal solidified layer was 0 nm, the Rth (550) was −160 nm, and a refractive index characteristic of nz> nx = ny was exhibited.

(Preparation of laminate)
A laminate was obtained in the same manner as in Example 1 except that the above retardation film and liquid crystal solidified layer were used.
The Re (550) of the obtained laminate was 150 nm, and the Rth (550) was 21 nm.

Comparative Example 12
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer) and liquid crystal solidified layer (second retardation layer) were used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(Preparation of first retardation layer)
A retardation film was obtained in the same manner as in Comparative Example 1 except that fixed-end stretching at a MD stretching ratio of 1.3 was performed.
The Re (550) and Rth (550) of the obtained retardation film were 120 nm and 130 nm, respectively, and exhibited a refractive index characteristic of nx>ny> nz. Moreover, the water absorption of the obtained retardation film was 3.2%, and the phase difference fluctuation | variation by an environmental test was 15 nm.

(Preparation of second retardation layer)
Thickness: A liquid crystal solidified layer was obtained in the same manner as in Comparative Example 1 except that the thickness was adjusted to 0.75 μm.
The Re (550) of the obtained liquid crystal solidified layer was 0 nm, the Rth (550) was −90 nm, and a refractive index characteristic of nz> nx = ny was exhibited.

(Preparation of laminate)
A laminate was obtained in the same manner as in Example 1 except that the above retardation film and liquid crystal solidified layer were used.
The Re (550) of the obtained laminate was 120 nm, and the Rth (550) was 40 nm.

Comparative Example 13
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer) and liquid crystal solidified layer (second retardation layer) were used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(Preparation of first retardation layer)
A retardation film was obtained in the same manner as in Comparative Example 3 except that fixed-end stretching at a MD stretching ratio of 2.3 was performed.
The Re (550) and Rth (550) of the obtained retardation film were 120 nm and 130 nm, respectively, and exhibited a refractive index characteristic of nx>ny> nz. Moreover, the water absorption of the obtained retardation film was 4.9%, and the phase difference fluctuation | variation by an environmental test was 20 nm.

(Preparation of second retardation layer)
Thickness: A liquid crystal solidified layer was obtained in the same manner as in Comparative Example 3 except that the thickness was adjusted to 0.75 μm.
The Re (550) of the obtained liquid crystal solidified layer was 0 nm, the Rth (550) was −90 nm, and a refractive index characteristic of nz> nx = ny was exhibited.

(Preparation of laminate)
A laminate was obtained in the same manner as in Example 1 except that the above retardation film and liquid crystal solidified layer were used.
The Re (550) of the obtained laminate was 120 nm, and the Rth (550) was 40 nm.

[Example 18]
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer and second retardation layer) was used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(Preparation of first retardation layer)
A retardation film was obtained in the same manner as in Example 1 except that sequential biaxial stretching (fixed end stretching at a MD stretching ratio of 1.6 times and then lateral stretching at a TD stretching ratio of 1.26 times) was performed.
The Re (550) and Rth (550) of the obtained retardation film were 40 nm and 100 nm, respectively, and exhibited a refractive index characteristic of nx>ny> nz. Moreover, Re (450) / Re (550) of the obtained retardation film was 0.89. Furthermore, the phase difference fluctuation | variation by an environmental test was 5 nm.

(Preparation of second retardation layer)
A retardation film was obtained in the same manner as in Example 6, except that the draw ratio was 1.2 and the thickness was 41 μm. Re (550) of the obtained retardation film was 80 nm, Rth (550) was -60 nm, and it showed the refractive index characteristic of nz>nx> ny.

(Preparation of laminate)
Examples except that each of the retardation films described above was used, and that the slow axis of the first retardation layer and the slow axis of the second retardation layer were substantially parallel to each other A laminate was obtained in the same manner as in 1.
The Re (550) of the obtained laminate was 120 nm, and the Rth (550) was 40 nm.

[Example 19]
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer and second retardation layer) was used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(Preparation of first retardation layer)
A retardation film was obtained in the same manner as in Example 1 except that sequential biaxial stretching (fixed end stretching at a MD stretching ratio of 2.7, and then lateral stretching at a TD stretching ratio of 1.1) was performed.
The Re (550) and Rth (550) of the obtained retardation film were 160 nm and 180 nm, respectively, and exhibited a refractive index characteristic of nx>ny> nz. Moreover, Re (450) / Re (550) of the obtained retardation film was 0.89. Furthermore, the phase difference fluctuation | variation by an environmental test was 5 nm.

(Preparation of second retardation layer)
A retardation film was obtained in the same manner as in Example 6, except that the draw ratio was 1.1 and the thickness was 35 μm. Re (550) of the obtained retardation film was 40 nm, Rth (550) was -80 nm, and it showed the refractive index characteristic of nz>nx> ny.

(Preparation of laminate)
Example 1 except that each of the retardation films described above was used, and the slow axis of the first retardation layer and the slow axis of the second retardation layer were substantially orthogonal to each other. A laminate was obtained in the same manner as in.
The Re (550) of the obtained laminate was 120 nm, and the Rth (550) was 100 nm.

[Example 20]
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer and second retardation layer) was used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(Preparation of first retardation layer)
A retardation film was obtained in the same manner as Example 1, except that sequential biaxial stretching (fixed-end stretching at a MD stretching ratio of 1.65 times and then transverse stretching at a TD stretching ratio of 1.31 times) was performed.
The Re (550) and Rth (550) of the obtained retardation film were 40 nm and 120 nm, respectively, and exhibited a refractive index characteristic of nx>ny> nz. Moreover, Re (450) / Re (550) of the obtained retardation film was 0.89. Furthermore, the phase difference fluctuation | variation by an environmental test was 5 nm.

(Preparation of second retardation layer)
A retardation film was obtained in the same manner as Example 6, except that the draw ratio was 1.3 times and the thickness was 41 μm. Re (550) of the obtained retardation film is 120 nm, Rth (550) is -20 nm, and it showed the refractive index characteristic of nz>nx> ny.

(Preparation of laminate)
Examples except that each of the retardation films described above was used, and that the slow axis of the first retardation layer and the slow axis of the second retardation layer were substantially parallel to each other A laminate was obtained in the same manner as in 1.
The Re (550) of the obtained laminate was 160 nm and the Rth (550) was 100 nm.

[Example 21]
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer and second retardation layer) was used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(Preparation of first retardation layer)
A retardation film was obtained in the same manner as in Example 1 except that fixed-end stretching was performed at an MD stretching ratio of 2.75.
The Re (550) and the Rth (550) of the obtained retardation film were 170 nm and 180 nm, respectively, and exhibited a refractive index characteristic of nx>ny> nz. Moreover, Re (450) / Re (550) of the obtained retardation film was 0.89. Furthermore, the phase difference fluctuation | variation by an environmental test was 5 nm.

(Preparation of second retardation layer)
A retardation film was obtained in the same manner as in Example 6, except that the draw ratio was 1.025 and the thickness was 45.5 μm. Re (550) of the obtained retardation film was 10 nm, Rth (550) was -140 nm, and it showed the refractive index characteristic of nz>nx> ny.

(Preparation of laminate)
Example 1 except that each of the retardation films described above was used, and the slow axis of the first retardation layer and the slow axis of the second retardation layer were substantially orthogonal to each other. A laminate was obtained in the same manner as in.
The Re (550) of the obtained laminate was 160 nm and the Rth (550) was 40 nm.

Example 22
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer and second retardation layer) was used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(Preparation of first retardation layer)
The commercially available retardation film used in Example 4 is simultaneously biaxially stretched at a stretching temperature of 190 ° C. (MD stretching ratio 0.85 times, TD stretching ratio 1.2 times), and the first retardation layer retardation I got a film.
The Re (550) and Rth (550) of the obtained retardation film were 40 nm and 100 nm, respectively, and exhibited a refractive index characteristic of nx>ny> nz. Moreover, Re (450) / Re (550) of the obtained retardation film was 0.89. Furthermore, the phase difference fluctuation | variation by an environmental test was 5 nm.

(Second retardation layer)
The retardation film produced in Example 18 was used.

(Preparation of laminate)
Examples except that each of the retardation films described above was used, and that the slow axis of the first retardation layer and the slow axis of the second retardation layer were substantially parallel to each other A laminate was obtained in the same manner as in 1.
The Re (550) of the obtained laminate was 120 nm, and the Rth (550) was 40 nm.

[Example 23]
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer and second retardation layer) was used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(Preparation of first retardation layer)
The commercially available retardation film used in Example 4 was fixed-end drawn at a draw ratio of 1.25 and a first retardation film for retardation layer was obtained.
The Re (550) and the Rth (550) of the obtained retardation film were 170 nm and 180 nm, respectively, and exhibited a refractive index characteristic of nx>ny> nz. Moreover, Re (450) / Re (550) of the obtained retardation film was 0.89. Furthermore, the phase difference fluctuation | variation by an environmental test was 5 nm.

(Second retardation layer)
The retardation film produced in Example 21 was used.

(Preparation of laminate)
Example 1 except that each of the retardation films described above was used, and the slow axis of the first retardation layer and the slow axis of the second retardation layer were substantially orthogonal to each other. A laminate was obtained in the same manner as in.
The Re (550) of the obtained laminate was 160 nm and the Rth (550) was 40 nm.

Comparative Example 14
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer and second retardation layer) was used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(Preparation of first retardation layer)
A retardation film was obtained in the same manner as in Example 1 except that sequential biaxial stretching (fixed end stretching at a MD stretching ratio of 1.65 times and then transverse stretching at a TD stretching ratio of 1.3 times) was performed.
The Re (550) and Rth (550) of the obtained retardation film were 50 nm and 125 nm, respectively, and exhibited a refractive index characteristic of nx>ny> nz. Moreover, Re (450) / Re (550) of the obtained retardation film was 0.89. Furthermore, the phase difference fluctuation | variation by an environmental test was 5 nm.

(Preparation of second retardation layer)
A retardation film was obtained in the same manner as in Example 6, except that the draw ratio was 1.2 and the thickness was 50 μm. The Re (550) and Rth (550) of the obtained retardation film were 80 nm and -90 nm, respectively, and exhibited a refractive index characteristic of nz>nx> ny.

(Preparation of laminate)
Examples except that each of the retardation films described above was used, and that the slow axis of the first retardation layer and the slow axis of the second retardation layer were substantially parallel to each other A laminate was obtained in the same manner as in 1.
The Re (550) of the obtained laminate was 130 nm and the Rth (550) was 35 nm.

Comparative Example 15
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer and second retardation layer) was used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(Preparation of first retardation layer)
A retardation film was obtained in the same manner as in Example 1 except that fixed-end stretching was performed at an MD stretching ratio of 2.8 times.
The Re (550) and the Rth (550) of the obtained retardation film were 180 nm and 190 nm, respectively, and exhibited a refractive index characteristic of nx>ny> nz. Moreover, Re (450) / Re (550) of the obtained retardation film was 0.89. Furthermore, the phase difference fluctuation | variation by an environmental test was 5 nm.

(Preparation of second retardation layer)
A retardation film was obtained in the same manner as Example 6, except that the draw ratio was 1.025 and the thickness was 26.6 μm. Re (550) of the obtained retardation film was 10 nm, Rth (550) was -80 nm, and it showed the refractive index characteristic of nz>nx> ny.

(Preparation of laminate)
Example 1 except that each of the retardation films described above was used, and the slow axis of the first retardation layer and the slow axis of the second retardation layer were substantially orthogonal to each other. A laminate was obtained in the same manner as in.
The Re (550) of the obtained laminate was 170 nm and the Rth (550) was 110 nm.

Comparative Example 16
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer and second retardation layer) was used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(Preparation of first retardation layer)
A retardation film was obtained in the same manner as in Comparative Example 1 except that sequential biaxial stretching (free-end stretching at a MD stretching ratio of 1.18 times and transverse stretching at a TD stretching ratio of 1.08 times) was performed.
The Re (550) and Rth (550) of the obtained retardation film were 40 nm and 100 nm, respectively, and exhibited a refractive index characteristic of nx>ny> nz. Moreover, the water absorption of the obtained retardation film was 3.2%, and the phase difference fluctuation | variation by an environmental test was 15 nm.

(Second retardation layer)
The retardation film produced in Example 18 was used.

(Preparation of laminate)
Example 1 except that each of the retardation films described above was used, and the slow axis of the first retardation layer and the slow axis of the second retardation layer were substantially parallel. A laminate was obtained in the same manner as in.
The Re (550) of the obtained laminate was 120 nm, and the Rth (550) was 40 nm.

Comparative Example 17
An organic EL panel was produced in the same manner as in Example 1 except that the following retardation film (first retardation layer and second retardation layer) was used.
The measurement results of the reflection hue of this organic EL panel are shown in Table 1.

(Preparation of first retardation layer)
A retardation film was obtained in the same manner as in Comparative Example 3 except that sequential biaxial stretching (fixed end stretching at a MD stretching ratio of 1.96 times and then transverse stretching at a TD stretching ratio of 1.37 times) was performed.
The Re (550) and Rth (550) of the obtained retardation film were 40 nm and 100 nm, respectively, and exhibited a refractive index characteristic of nx>ny> nz. Moreover, the water absorption of the obtained retardation film was 4.9%, and the phase difference fluctuation | variation by an environmental test was 20 nm.

(Second retardation layer)
The retardation film produced in Example 18 was used.

(Preparation of laminate)
Example 1 except that each of the retardation films described above was used, and the slow axis of the first retardation layer and the slow axis of the second retardation layer were substantially parallel. A laminate was obtained in the same manner as in.
The Re (550) of the obtained laminate was 120 nm, and the Rth (550) was 40 nm.

  In each of the examples, the viewing angle characteristics were all less than 0.07, and the hue changes Δxy in both the front and oblique directions were all less than 0.07. In a comparative example in which the water absorption rate of the first retardation layer or Re (550) or Rth (550) of the laminate of the first retardation layer and the second retardation layer is out of the scope of the present invention In the above, at least one of the viewing angle characteristics, the change Δx in the frontal hue, and the change Δxy in the oblique hue is insufficient.

  The polarizing plate of the present invention is suitably used for an organic EL device.

10 Polarizer 20 Protective Film 21 First Protective Film 22 Second Protective Film 30 First Retardation Layer 40 Second Retardation Layer 100 Polarizing Plate 100 ′ Polarizing Plate

Claims (1)

A polarizer , a first protective film disposed on one side of the polarizer, and a second protective film disposed sequentially on the other side of the polarizer from the polarizer side, a first position A retardation layer and a second retardation layer,
The first retardation layer exhibits a refractive index characteristic of nx> ny = nz, and satisfies the relationship of Re (450) <Re (550),
The second retardation layer exhibits a refractive index characteristic of nz> nx ≧ ny,
The angle θ between the absorption axis of the polarizer and the slow axis of the first retardation layer satisfies the relationship 35 ° ≦ θ ≦ 55 °.
Re (550) of a laminate of the first retardation layer and the second retardation layer is 120 nm to 160 nm,
The water absorption of the first retardation layer is 3% or less,
The Re (550) of the second protective film is 0 nm to 10 nm,
Used in organic EL panels,
Polarizer:
Here, Re (450) and Re (550) represent in-plane retardations measured with light of wavelengths 450 nm and 550 nm at 23 ° C., and Rth (550) with light of wavelength 550 nm at 23 ° C. Represents the retardation in the thickness direction.

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