KR20080096443A - Polarizing plate and touch panel - Google Patents

Abstract

A polarizing plate and a touch panel having a transparent conductive layer with a superior high intensity, mechanical durability are provided. A polarizing plate comprises a polarizing film of which both sides consist of stacked cyclic olefin base polymer layers, and a transparent conduction layer of amorphousness opposite to the polarizing film.

Description

POLARIZING PLATE AND TOUCH PANEL}

The present invention relates to a polarizing plate with a transparent conductive layer and a touch panel having the polarizing plate. In particular, it relates to a polarizing plate which is preferably used for a vehicle-mounted touch panel and a touch panel having the same.

When a finger presses or draws with a special pen, the resistive touch panel where the part is in contact with the facing electrode and is energized to input a signal is advantageous for small size, light weight, and thinness, and thus is widely used as an input device for various home appliances and portable terminals. It is used.

The resistive touch panel is obtained by stacking an upper electrode formed by forming a transparent conductive layer on a polymer film on a lower electrode formed by forming a transparent conductive layer on a substrate, with spacers facing each other, such that each transparent conductive layer faces each other. When the display surface of the upper electrode is pressed with a finger or a pen, the upper electrode and the lower electrode are brought into contact with each other and are energized to input signals. Moreover, recently, the polarizing plate integrated internal touch panel which uses the polarizing plate with a transparent conductive layer as an upper electrode of a touch panel is proposed (refer patent document 1 below), and attracts attention from the point which is excellent in visibility and contrast.

The transparent conductive layer of the conventional touch panel is generally formed by DC sputtering. In such a touch panel, the transparent conductive layer of the upper electrode and the transparent conductive layer of the lower electrode are repeatedly contacted and non-contacted according to an input by a finger or a pen, such as ITO (indium tin oxide), which is a material for forming the transparent conductive layer, and the like. Of the transparent conductive material has low scratch resistance, and therefore, cracks are likely to occur in the transparent conductive layer of the upper electrode which is repeatedly deformed during the input of the touch panel, particularly in contact with the transparent conductive layers of the same material. There was a problem that the transparent conductive layer peeled off from the polymer film serving as the substrate in a non-contact manner and easily fell off. In particular, in-vehicle touch panels used in car navigation systems and the like require more stringent heat resistance and moisture resistance, and durability of the transparent conductive layer has become a problem.

In particular, in the case of an internal touch panel in which a polarizing plate is integrated, a layer structure in which a polarizing plate protective layer is provided on one side of the polarizing film and an isotropic support layer is provided on the other side, and a transparent conductive film is provided on the surface opposite to the polarizing film side of the supporting layer To have. The transparent conductive layer is usually laminated on the polarizing plate protective layer. In the case of using a triacetyl cellulose (TAC) film, which is generally used as a polarizing plate protective layer, acid is generated from the TAC film when it is used for a long period of time under severe heat deterioration. There was a problem that there is a risk of damage.

If the transparent conductive layer of the upper electrode is damaged or peeled off, the electrical resistance value of the transparent conductive layer surface changes, and its uniformity is lost, thereby deteriorating its electrical characteristics, thereby making it impossible to perform accurate input, which is the reliability of the touch panel. This damages the chip, resulting in damage, defects, and reduced durability.

[Patent Document 1] Japanese Patent Application Laid-Open No. 11-053118

SUMMARY OF THE INVENTION The present invention has been made to solve the problems in the prior art as described above, wherein the transparent conductive layer does not generate cracks over a long period of time, maintains a low resistance value, and has a high strength and has a high mechanical durability. It aims at providing the touch panel which has a polarizing plate with and the said polarizing plate.

According to the present invention, even in applications where stringent heat resistance and moisture resistance are required, such as a vehicle-mounted touch panel, the transparent conductive layer does not generate cracks for a long time, maintains a low resistance value and has excellent mechanical durability at high strength. A polarizing plate with a transparent conductive layer and a touch panel having the polarizing plate can be provided.

The present invention provides toughness by using a cyclic olefin polymer which is excellent in adhesion to a transparent conductive layer or a hard coating layer used as necessary as a substrate of a transparent conductive layer and does not generate chemical substances such as acids even in long-term storage. By providing this excellent transparent transparent conductive layer, it has succeeded in providing the polarizing plate and touch panel excellent in long-term durability, without using the TAC film which affects the durability of a transparent conductive layer.

Best Mode for Carrying Out the Invention

In the polarizing plate of the present invention, a cyclic olefin polymer layer is laminated on both surfaces of a polarizing film, respectively, and an amorphous transparent conductive material is provided on the surface opposite to the polarizing film of at least one cyclic olefin polymer layer directly or through another layer. The layer is laminated.

It is preferable that the cyclic olefin polymer layer used by this invention contains the polymer obtained by (co) polymerizing the monomer containing the 1 or more types of compound represented by following formula (Hereinafter, it is also called a "specific monomer.").

In Formula 1, R ¹ to R ⁴ each independently represent a hydrogen atom; a halogen atom; or a monovalent group which may contain oxygen, nitrogen, sulfur, or silicon, and R ¹ and R ² , or R ³ and R ⁴ May be bonded to each other to form an alkylidene group, or R ¹ and R ² , R ³ and R ⁴ , or R ² and R ³ may be bonded to each other to form a monocyclic or polycyclic carbocyclic or heterocyclic ring, , x is 0 or an integer from 1 to 3, y represents 0 or 1)

It is preferable that the transparent conductive layer used by this invention is laminated | stacked on the cyclic olefin type polymer layer through the hard-coat layer containing dispersion | distribution microparticles | fine-particles.

The touch panel of the present invention is characterized by having the polarizing plate of the present invention.

It is preferable that the touch panel of this invention is a vehicle-mounted touch panel.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated concretely.

[Cyclic Olefin Polymer Layer]

The cyclic olefin polymer layer used for the polarizing plate of this invention is formed by bonding a cyclic olefin polymer film to both surfaces of a polarizing film normally via an adhesive agent. As cyclic olefin type polymer which comprises the said cyclic olefin type polymer film, Preferably the cyclic olefin type polymer which has a structural unit derived from a specific monomer is mentioned.

(Cyclic olefin polymer)

As a cyclic olefin polymer used preferably for the said cyclic olefin polymer film, the following (co) polymer is mentioned.

(a) The ring-opening (co) polymer of the specific monomer represented by the said General formula (1) with another cycloolefin, such as a cycloalkene as needed.

(b) Hydrogenated (co) polymer of the ring-opening (co) polymer of (a).

(c) Additive (co) polymers, such as the said other cycloolefin and (alpha) -olefin, and its hydrogenated (co) polymer as needed with the specific monomer represented by the said General formula (1).

Among them, hydrogenated (co) polymers of (b) ring-opening (co) polymers are particularly preferred in view of optical properties and processability.

Although the following compounds are mentioned as a specific example of the said specific monomer, This invention is not limited to these specific examples.

Bicyclo [2.2.1] hept-2-ene,

Tricyclo [4.3.0.1 ^2,5 ] -8-decene,

Tricyclo [4.4.0.1 ^2,5 ] -3-undecene,

Tetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene,

^Pentacyclo [6.5.1.1 ^{3,6 2,7} .0 ^9,13 ] -4- ^pentadecene ,

5-methylbicyclo [2.2.1] hept-2-ene,

5-ethylbicyclo [2.2.1] hept-2-ene,

5-methoxycarbonylbicyclo [2.2.1] hept-2-ene,

5-methyl-5-methoxycarbonylbicyclo [2.2.1] hept-2-ene,

5-cyanobicyclo [2.2.1] hept-2-ene,

8-methoxycarbonyltetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene,

8-ethoxycarbonyltetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene,

8-n-propoxycarbonyltetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene,

8-isopropoxycarbonyltetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene,

8-n-butoxycarbonyltetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene,

8-methyl-8-methoxycarbonyltetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene,

8-methyl-8-ethoxycarbonyltetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene,

8-methyl-8-n-propoxycarbonyltetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene,

8-methyl-8-isopropoxycarbonyltetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene,

8-methyl-8-n-butoxycarbonyltetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene,

5-ethylidenebicyclo [2.2.1] hept-2-ene,

8-ethylidenetetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene,

5-phenylbicyclo [2.2.1] hept-2-ene,

8-phenyl-tetracyclo [4.4.0.1 ^2,5 .1 ^7,10] -3- dodecene,

5-fluorobicyclo [2.2.1] hept-2-ene,

5-fluoromethylbicyclo [2.2.1] hept-2-ene,

5-trifluoromethylbicyclo [2.2.1] hept-2-ene,

5-pentafluoroethylbicyclo [2.2.1] hept-2-ene,

5,5-difluorobicyclo [2.2.1] hept-2-ene,

5,6-difluorobicyclo [2.2.1] hept-2-ene,

5,5-bis (trifluoromethyl) bicyclo [2.2.1] hept-2-ene,

5,6-bis (trifluoromethyl) bicyclo [2.2.1] hept-2-ene,

5-methyl-5-trifluoromethylbicyclo [2.2.1] hept-2-ene,

5,5,6-trifluorobicyclo [2.2.1] hept-2-ene,

5,5,6-tris (fluoromethyl) bicyclo [2.2.1] hept-2-ene,

5,5,6,6-tetrafluorobicyclo [2.2.1] hept-2-ene,

5,5,6,6-tetrakis (trifluoromethyl) bicyclo [2.2.1] hept-2-ene,

5,5-difluoro-6,6-bis (trifluoromethyl) bicyclo [2.2.1] hept-2-ene,

5,6-difluoro-5,6-bis (trifluoromethyl) bicyclo [2.2.1] hept-2-ene,

5,5,6-trifluoro-5-trifluoromethylbicyclo [2.2.1] hept-2-ene,

5-fluoro-5-pentafluoroethyl-6,6-bis (trifluoromethyl) bicyclo [2.2.1] hept-2-ene,

5,6-difluoro-5-heptafluoro-iso-propyl-6-trifluoromethylbicyclo [2.2.1] hept-2-ene,

5-chloro-5,6,6-trifluorobicyclo [2.2.1] hept-2-ene,

5,6-dichloro-5,6-bis (trifluoromethyl) bicyclo [2.2.1] hept-2-ene,

5,5,6-trifluoro-6-trifluoromethoxybicyclo [2.2.1] hept-2-ene,

5,5,6-trifluoro-6-heptafluoropropoxybicyclo [2.2.1] hept-2-ene,

8-fluorotetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene,

8-fluoromethyltetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene,

8-difluoromethyltetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene,

8-trifluoromethyltetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene,

8-pentafluoroethyltetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene,

8,8-difluorotetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene,

8,9-difluorotetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene,

8,8-bis (trifluoromethyl) tetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene,

8,9-bis (trifluoromethyl) tetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene,

8-methyl-8-trifluoromethyltetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene,

8,8,9-trifluorotetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene,

8,8,9-tris (trifluoromethyl) tetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene,

8,8,9,9-tetrafluorotetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene,

8,8,9,9-tetrakis (trifluoromethyl) tetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene,

8,8-difluoro-9,9-bis (trifluoromethyl) tetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene,

8,9-difluoro-8,9-bis (trifluoromethyl) tetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ]-3-dodecene,

8,8,9-trifluoro-9-trifluoromethyltetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene,

8,8,9-trifluoro-9-trifluoromethoxytetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene,

8,8,9-trifluoro-9-pentafluoropropoxytetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene,

8-fluoro-8-pentafluoroethyl-9,9-bis (trifluoromethyl) tetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene,

8,9-difluoro-8-heptafluoro-iso-propyl-9-trifluoromethyltetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene,

8-chloro-8,9,9-trifluorotetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene,

8,9-dichloro-8,9-bis (trifluoromethyl) tetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene,

8- (2,2,2-trifluoroethoxycarbonyl) tetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene,

8-methyl-8- (2,2,2-trifluoroethoxycarbonyl) tetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene

Etc. can be mentioned.

These can be used individually by 1 type or in combination of 2 or more types.

Among the specific monomers represented by Formula 1, R ¹ and R ^{3 in} Formula 1 are hydrogen atoms or hydrocarbon groups having 1 to 10 carbon atoms, more preferably 1 to 4 carbon atoms, and particularly preferably 1 to 2 carbon atoms. , R ² and R ⁴ are hydrogen atoms or monovalent organic groups, at least one of R ² and R ⁴ represents a polar group having a polarity other than a hydrogen atom and a hydrocarbon group, x is 0 or an integer of 1 to 3, y Is 0 or 1, more preferably x + y = 0 to 4, still more preferably 0 to 2, particularly preferably x = 0 and y = 1. The specific monomer whose x = 0 and y = 1 is preferable at the point which becomes high in the glass transition temperature of the cyclic olefin type polymer obtained, and excellent also in mechanical strength.

As a polar group of the said specific monomer, a carboxyl group, a hydroxyl group, an alkoxycarbonyl group, an allyloxycarbonyl group, an amino group, an amide group, a cyano group, etc. are mentioned, These polar groups may be couple | bonded through coupling groups, such as a methylene group. Moreover, the hydrocarbon group etc. which the bivalent organic group which has polarity, such as a carbonyl group, an ether group, a silyl ether group, a thioether group, and an imino group, couple | bond and couple | bond are mentioned as a polar group. In this, a carboxyl group, a hydroxyl group, an alkoxycarbonyl group, or allyloxycarbonyl group is preferable, and an alkoxycarbonyl group or allyloxycarbonyl group is especially preferable.

In addition, R ² and R one or more of the ^4, the formula - to have the (CH _{2) n} excellent adhesion to the polar group of the monomer is obtained cycloolefin polymer has a high glass transition temperature and low moisture absorption, a variety of materials represented by COOR It is preferable at the point which becomes. In the chemical formula relating to the above specific polar group, R is a hydrocarbon group having 1 to 12 carbon atoms, more preferably 1 to 4 carbon atoms, particularly preferably 1 to 2 carbon atoms, preferably an alkyl group. In addition, n is usually 0 to 5, but a smaller value of n is preferable because the glass transition temperature of the cyclic olefin polymer obtained is higher, and a particular monomer having n of 0 is preferable in that its synthesis is easy. .

In the above formula (1), R ¹ or R ³ is preferably an alkyl group, preferably an alkyl group having 1 to 4 carbon atoms, more preferably an alkyl group having 1 to 2, in particular a methyl group, and in particular, the alkyl group is It is preferable that the specific polar group represented by-(CH ₂ ) _n COOR is bonded to the same carbon atom as the carbon atom to which it is bonded, in view of lowering the hygroscopicity of the obtained cyclic olefin polymer.

The cyclic olefin polymer used in the present invention is obtained by ring-opening (co) polymerizing or addition (co) polymerizing the above-described specific monomers and other monomers, if necessary, by a known method and hydrogenating as necessary.

The intrinsic viscosity [η] _inh of the cyclic olefin polymer used in the present invention in chloroform at 30 ° C. is preferably 0.2 to 2.0 dl / g, more preferably 0.35 to 1.0 dl / g, particularly preferably Is 0.4 to 0.85 dl / g, and the number average molecular weight (Mn) in terms of polystyrene measured by gel permeation chromatography is preferably 5000 to 1 million, more preferably 10,000 to 500,000, particularly preferably 1.5 million. It is 250,000-250,000, It is preferable that weight average molecular weights (Mw) are 10,000-2 million, More preferably, it is 20,000-1 million, Especially preferably, it is 30,000-500,000. When intrinsic viscosity [(eta)] _h , a number average molecular weight, and a weight average molecular weight are in the said range, a cyclic olefin type polymer is excellent in mechanical strength and the cyclic olefin type polymer film which is hard to be damaged is obtained.

In addition, the glass transition temperature (Tg) of the said cyclic olefin polymer is 120 degreeC or more normally, Preferably it is 130 degreeC or more. When Tg is in the said range, the cyclic olefin polymer film which has high reliability also in long term use is obtained.

The water vapor permeability of the cyclic olefin polymer is a value measured based on the humidity sensor method of JIS K7129 under conditions of a measurement temperature of 40 ° C. and a relative humidity of 90% RH, and usually 300 (g · 25 μm / m 2) 24 hr) or less, Preferably it is 5-200 (g * 25 micrometer / m <2> * 24 hr), Especially preferably, it is 50-150 (g * 25 micrometer / m <2> / 24 hr). When the water vapor transmission rate is less than 5 (g · 25 μm / m 2 · 24 hr), when the water-based adhesive is used as the adhesive at the time of manufacturing the polarizing plate, moisture drying of the polarizing film may be difficult. Moreover, when it exceeds 200 (g * 25 micrometer / m <2> * 24hr), water intrudes into the polarizing film inside a polarizing plate in a high temperature, high humidity atmosphere, and since it worsens an optical characteristic, it is unpreferable.

In the above-mentioned cyclic olefin polymer, the specific hydrocarbon described in Unexamined-Japanese-Patent No. 9-221577 and Unexamined-Japanese-Patent No. 10-287732 in the range which does not impair the effect of this invention, for example. You may mix | blend a system resin, a well-known thermoplastic resin, a thermoplastic elastomer, a rubbery polymer, organic microparticles | fine-particles, an inorganic fine particle, etc.

Moreover, additives, such as a well-known antioxidant and a ultraviolet absorber, can be added to the cyclic olefin type polymer used for this invention in order to improve heat | fever deterioration resistance and light resistance, in the range which does not impair the effect of this invention.

(Method for producing cyclic olefin polymer film)

The cyclic olefin polymer film used in the present invention is preferably formed by directly melt molding the cyclic olefin polymer or the resin composition containing the cyclic olefin polymer and the additive, or by dissolving in a solvent and casting (cast molding). It can be molded.

(A) melt molding

The cyclic olefin polymer film used in the present invention can be produced by melt extrusion molding the cyclic olefin polymer or the resin composition containing the cyclic olefin polymer and the additive.

(B) casting

The cyclic olefin polymer film used in the present invention may be produced by casting the cyclic olefin polymer and the liquid resin composition in which the additive is dissolved in a solvent, if necessary, on an appropriate substrate and removing the solvent. For example, a cyclic olefin polymer film can be obtained by apply | coating the said liquid resin composition on base materials, such as a steel belt, a steel drum, or a polyester film, drying a solvent, and peeling a coating film from a base material after that.

As little as possible residual solvent amount in the cyclic olefin polymer film obtained by the said method is 3 weight% or less normally, Preferably it is 1 weight% or less, More preferably, it is 0.5 weight% or less. When the amount of residual solvent is in the above range, deformation and characteristic change of the film are hardly generated over time, and a cyclic olefin polymer film having a desired function can be obtained.

Although the thickness of the cyclic olefin polymer film used by this invention is not specifically limited, Usually, 5-500 micrometers, Preferably it is 10-150 micrometers, It is preferable that it is 20-100 micrometers more preferably. When the thickness of the film is in the above range, a film of sufficient strength can be obtained, and a film having good birefringence, transparency, and appearance can be obtained.

The cyclic olefin polymer film used in the present invention is preferably 80% or more, preferably 85% or more, and more preferably 90% or more.

Moreover, the cyclic olefin polymer film used by this invention may be surface-treated in order to improve adhesiveness with the adhesive bond layer mentioned later. Examples of the surface treatment include primer treatment, plasma treatment, corona treatment, alkali treatment, coating treatment, and the like.

During the surface treatment, in particular, by using corona treatment, the cyclic olefin polymer film and the adhesive layer can be firmly adhered to each other. As a corona treatment condition in this case, 1 to 1000 W / m <2> / min of irradiation amount of a corona discharge electron is preferable, and 10-100 W / m <2> / min is more preferable. If the irradiation amount is in the above range, the effect of treatment does not reach the inside of the film, and a sufficient surface modification effect is obtained without altering the film. In addition, this corona treatment can be performed not only in the surface which contacts an adhesive bond layer but in the surface on the opposite side.

The cyclic olefin polymer film used in the present invention may have a function as a retardation film subjected to an stretching treatment. As a method of an extending | stretching process, the method of uniaxial stretching or biaxial stretching of a resin film is used. In the case of the uniaxial stretching treatment, the stretching speed is usually 1 to 5,000% / min, preferably 50 to 1,000% / min, and more preferably 100 to 1,000% / min. In the case of a biaxial stretching process, the method of extending | stretching in two directions simultaneously and the method of extending | stretching in the direction different from this extending | stretching direction after uniaxial stretching process are applicable. At this time, the crossing angle of two stretching axes is suitably determined according to the characteristic requested | required of the optical film (retardation film) made into the objective, and although it does not specifically limit, it is the range of 60-120 degree normally. The stretching speed is usually 1 to 5,000% / min, preferably 50 to 1,000% / min, more preferably 100 to 1,000% / min, particularly preferably 100 to 500% / min, and the same in each stretching direction. It may or may be different.

The stretching treatment temperature is not particularly limited, but is based on the glass transition temperature (Tg) of the cyclic olefin polymer used, Tg ± 30 ° C, preferably Tg ± 15 ° C, more preferably Tg-5 ° C to It is the range of Tg + 15 degreeC. By setting an extending | stretching process temperature in the said range, it can suppress that phase difference nonuniformity arises in the stretched film obtained, and it is preferable at the point by which control of a refractive index ellipsoid becomes easy.

The draw ratio is appropriately determined according to the properties required for the desired optical film, and is not particularly limited, but is usually 1.01 to 10 times, preferably 1.03 to 5 times, and more preferably 1.03 to 3 times. . When a draw ratio exists in the said range, the phase difference of the stretched film obtained can be easily controlled. The stretched film may be cooled as it is, but it is preferably cooled after maintaining at least 10 seconds, preferably for 30 seconds to 60 minutes, more preferably for 1 to 60 minutes, under a temperature atmosphere of Tg-20 ° C to Tg. Do. Thereby, the retardation film with little time-dependent change of the phase difference of transmitted light is obtained.

As described above, the film subjected to the stretching treatment can impart retardation to the transmitted light as a result of molecular orientation by the stretching treatment. The retardation can be controlled by the stretching ratio, the stretching temperature or the thickness of the film.

Although the thickness of the cyclic olefin polymer film used as retardation film is not specifically limited, Usually, 5-500 micrometers, Preferably it is 10-150 micrometers, It is preferable that it is 20-100 micrometers more preferably.

[Hard Coating Layer]

The cyclic olefin polymer layer used in the present invention may have a hard coating layer in advance on the side on which the transparent conductive layer is laminated. The hard coat layer is formed to avoid scratches on the surface of the cyclic olefin polymer layer during formation of the transparent conductive layer, subsequent processing, or assembly of the device, and this causes the visibility of the transparent conductive layer laminate to be lowered. It is preferable to disperse | distribute microparticles | fine-particles.

The hard coating treatment may be performed on both sides or one side of the film before or after the transparent conductive layer is formed. In the present invention, the hard coating treatment is preferably formed on both sides of the optical film before the transparent conductive layer is formed. As a hard coat layer, the hardened film of the hard coat processing agent which has the anti-glare effect which disperse | distributed microparticles | fine-particles to active energy ray hardening type resins, such as a melamine resin, urethane resin, alkyd resin, acrylic resin, silicone resin, is used preferably. Of the active energy ray-curable resins, acrylic resins are most preferably used because they have the effect of enhancing the adhesion of the transparent conductive layer.

The fine particles to be mixed in the hard coat treatment agent are not particularly limited, but the average particle diameter (primary average particle diameter) is, for example, about 1 nm to 100 nm, about 1 nm to 50 nm, and about 1 nm to 25 nm. It is suitable to use as a main component. Moreover, in addition to this, it is also preferable to use together the particle | grains whose average particle diameter is about 150-10 micrometers, and to manufacture the composition for protective layer formation. By having such an average particle diameter, partial display unevenness such as white blurring and / or black lifting, unclear display of background image, uneven display such as fluctuation and / or glare, interference of light such as Newton ring, etc. The three problems can be solved in a balanced manner. Moreover, as microparticles | fine-particles used here, a silica particle is preferable and colloidal silica, fumed silica, etc. are mentioned as a silica. The fumed silica referred to herein is anhydrous silica of high purity (99.9% or more) having the smallest particle shape (average primary particle size of 7 to 40 nm, specific surface area of 50 to 380 m 2 / g) having the smallest particle system produced on an industrial scale. In general, it is prepared by hydrolysis at a high temperature of 1000 ° C. or higher in an oxygen / hydrogen burner of silicon tetrachloride.

The thing which hydrophobized the silanol group of a surface can be used for silica, Preferably it is a thing hydrophobized.

The blending ratio of the silica particles is preferably such that the silica particles are 0.1 to 30 parts by weight based on 100 parts by weight of the resin. When the amount of the silica particles is small, the antiglare effect is inferior, and when the amount is large, the light transmittance and the film strength decrease.

In addition, crosslinked polymer particles such as acrylic particles can be used as the other particles.

In the formation of the cured film, a composition obtained by adding various additives, such as an antistatic agent and a polymerization initiator, to the active energy ray-curable resin and the fine particles described above as needed, is usually diluted with a solvent to produce a solid content of 20 to 80% by weight. This is applied to one side of the optical film by means of a gravure coater, reverse coater, spray coater, slot orifice coater or screen printing, which is a common solution coating means, so that the thickness after dry curing is about 1 to 15 µm, and then heated. After drying, it can be cured by ultraviolet irradiation or electron beam irradiation. Prior to the formation of the hard coat treatment layer, adhesion between the transparent film and the hard coat treatment layer can be further improved by subjecting the adhered surface to easy adhesion such as corona discharge, ultraviolet irradiation, plasma treatment, sputter etching treatment or primer treatment. .

[Transparent conductive layer]

The transparent conductive layer according to the present invention is a layer having transparency in the visible light region and having conductivity. As a method for forming the transparent conductive layer, any conventionally known technique such as vacuum deposition, sputtering, or ion plating can be used. However, in view of the uniformity of the film and the adhesion of the thin film to the transparent substrate, the formation of the thin film by the sputtering method desirable. Moreover, the thin film material used is not specifically limited, For example, in addition to metal oxides, such as indium oxide containing tin oxide and tin oxide containing antimony, gold, silver, platinum, palladium, copper, aluminum, nickel, Chromium, titanium, cobalt, tin, zinc or alloys thereof and the like are preferably used. Among them, indium oxide (ITO) containing tin oxide is mentioned as a preferable thing.

The thickness of the transparent conductive layer in this invention needs to be 30 kPa or more, and when it is thinner than this, it is hard to be a continuous film which has favorable electroconductivity that surface resistance becomes 1000 ohms / square or less. On the other hand, too thick causes a decrease in transparency and the like, and is preferably about 50 to 2000 kPa.

The transparent conductive layer according to the present invention is characterized by being amorphous. The amorphous transparent conductive layer is excellent in toughness as compared with crystalline and hardly causes cracks (cracks) due to changes over time. In the case of forming the amorphous transparent conductive layer by, for example, a sputtering method, it can be obtained by sputtering under the following conditions.

Base material temperature: 50 degrees Celsius or less

Target: oxide of In ₂ O ₃ / SnO ₂ = 90/10 (weight ratio)

Atmosphere: Argon Influx

Argon flow rate: 100 to 500 sccm

Power: 1 to 1.5 Kw

In the present invention, the transparent conductive layer is usually formed before bonding the cyclic olefin polymer film or the cyclic olefin polymer film in which the hard coating layer is laminated with the polarizing film.

[glue]

In this invention, the cyclic olefin polymer film and the polarizing film in which the transparent conductive layer was formed are adhere | attached normally using an adhesive agent. Although it does not specifically limit as said adhesive agent, UV-curable adhesive agent, such as a composition of an ultraviolet polymerizable polymer and / or an ultraviolet polymerizable monomer, and an ultraviolet polymerization initiator; Aqueous adhesives, such as polyvinyl alcohol aqueous solution, polyvinyl alcohol, aqueous solution of a polyurethane resin, and an epoxy hardening | curing agent, etc. are used especially preferably.

<Adhesive layer and its manufacturing method>

<Formula i>

The adhesive layer according to the present invention contains a polymer derived from at least one alkyl (meth) acrylate represented by the formula (i).

In the general formula (i), examples of the alkyl group having 1 to 12 carbon atoms represented by R 'include methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, i-butyl group, t-butyl group and n- Pentyl group, n-hexyl group, n-heptyl group, n-octyl group, n-nonyl group, n-decyl group, n-undecyl group, n-dodecyl group, etc. are mentioned, Among these, n-butyl group is mentioned. Particularly preferred. In addition, the alkyl (meth) acrylate represented by the said Formula (i) may contain 1 type as a monomer, and may contain 2 or more types.

The polymer contained in the adhesive layer which concerns on this invention may contain monomers other than alkyl (meth) acrylate. As for monomers other than alkyl (meth) acrylate, unsaturated carboxylic acid is preferable, For example, (alpha) * (beta)-unsaturated carboxylic acids, such as acrylic acid, methacrylic acid, and itaconic acid; Other (meth) acrylates such as 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-methoxyethyl (meth) acrylate, glycidyl (meth) acrylate; And compounds having other ethylenically unsaturated double bonds such as vinyl acetate, vinyl propionate, acrylonitrile, styrene, and vinyltoluene.

The polystyrene reduced weight average molecular weight measured by GPC of the polymer constituting the adhesive layer according to the present invention is characterized by being 1,500,000 or more. Preferably, it is 1,500,000 to 5,000,000, particularly preferably 1,500,000 to 3,000,000. By containing a polymer having a molecular weight of 1,500,000 or more, the adhesiveness with the norbornene-based resin film is increased, and even if stored for a long time under high temperature and high humidity, a polarizing plate with excellent long-term reliability can be obtained without foaming or peeling.

Moreover, it is preferable that the glass transition temperature (Tg) of the polymer which comprises an adhesion layer is -50 degreeC or more, Especially preferably, it is -50 degreeC--25 degreeC.

Although the thickness of the adhesion layer which concerns on this invention is not specifically limited, It is preferable that it is 5-50 micrometers normally, Preferably it is 10-40 micrometers, More preferably, it is 20-30 micrometers. When the thickness of the adhesion layer is less than 5 µm, it cannot follow the volume change of the polarizing plate, and there is a possibility that the lifting or peeling may occur. Moreover, when it exceeds 50 micrometers, there exists a possibility that an optical characteristic may deteriorate.

The adhesive layer which concerns on this invention is obtained by apply | coating and drying the adhesive composition obtained by adding a hardening | curing agent and an organic solvent to the said polymer as needed. Moreover, you may mix | blend a polyfunctional (meth) acrylate, a silane coupling agent, etc. as needed. When a polarizing plate is adhere | attached on a board | substrate through an adhesion layer, adhesion is performed by pressing an adhesion layer surface to a board | substrate, and pressing as needed while heating.

As said hardening | curing agent, an isocyanate compound <A>, an epoxy compound <B>, an aldehyde compound <C>, an amine compound <D>, etc. are illustrated as a preferable thing.

As the <A> isocyanate compound, tolylene diisocyanate, tolylene diisocyanate hydride, tolylene diisocyanate adduct of trimethylolpropane, xylylene diisocyanate adduct of trimethylolpropane, triphenylmethane triisocyanate, methylene bis (4-phenyl Methane) triisocyanate, isophorone diisocyanate, etc. are mentioned.

As an <B> epoxy compound, bisphenol A epichlorohydrin type epoxy resin, ethylene glycol diglycidyl ether, polyethyleneglycol diglycidyl ether, glycerin diglycidyl ether, glycerin triglycidyl ether, 1,6 -Hexanediol diglycidyl ether, trimethylolpropanetriglycidyl ether, diglycidyl aniline, diglycidylamine, N, N, N ', N'- tetraglycidyl-m-xylenediamine, 1 , 3-bis (N, N'- diglycidylaminomethyl) cyclohexane, etc. are mentioned.

Examples of the <C> aldehyde compound include glyoxal, malondialdehyde, succinic aldehyde, maleindialdehyde, glutalaldehyde, formaldehyde, acetaldehyde, benzaldehyde and the like.

Examples of the <D> amine compound include hexamethylenediamine, triethyldiamine, polyethyleneimine, hexamethylenetetramine, diethylenetriamine, triethyltetramine, isophoronediamine, amino resins, melamine resins, and the like.

[Polarizing Film]

The polarizing film used in the present invention is not particularly limited as long as it is a film having a function as a polarizing film, that is, a function of dividing incident light into two polarizing components orthogonal to each other, passing only one of them, and absorbing or dispersing the other components. Can also be used.

As a polarizing film which can be used by this invention, For example, polyvinyl alcohol (Hereinafter, abbreviated as "PVA") iodine type polarizing film; PVA dye-based polarizing film which adsorbed and oriented dichroic dye to PVA system film; Polyene type polarizing film which formed polyene by dehydration reaction of a PVA system film or dehydrochloric acid reaction of a polyvinyl chloride film; The polarizing film etc. which have a dichroic dye in the surface and / or inside of the PVA system film containing modified PVA containing a cationic group in a molecule | numerator are mentioned. Among these, a PVA iodine polarizing film is preferable.

The manufacturing method of the polarizing film used by this invention is not specifically limited, A conventionally well-known method is applicable. For example, after stretching a PVA film, a method of adsorbing iodine ions, a method of dyeing a PVA film with a dichroic dye and then stretching, a method of dyeing a PVA film with a dichroic dye, The method of extending | stretching after printing a dichroic dye on a PVA system film, the method of printing a dichroic dye after extending | stretching a PVA system film, etc. are mentioned. More specifically, iodine is dissolved in a potassium iodide solution to form higher order iodine ions, and the ions are adsorbed onto a PVA film and stretched, and then immersed in an aqueous solution of 1 to 5 wt% boric acid at a bath temperature of 30 to 40 ° C. A method of manufacturing a polarizing film; Alternatively, the PVA film is treated with boric acid as described above and stretched about 3 to 7 times in the uniaxial direction, and then the dye is adsorbed by immersing in a 0.05 to 5% by weight aqueous solution of dichroic dye at a bath temperature of 30 to 40 ° C, and then 80 And a method of manufacturing a polarizing film by drying at 100 ° C. and heat-setting.

Although the thickness of the polarizing film used by this invention is not specifically limited, It is preferable that it is 10-50 micrometers, Preferably it is 15-45 micrometers.

Although these polarizing films can also be used for manufacture of the polarizing plate which concerns on this invention as they are, they can also be used by giving a corona discharge process and a plasma process to the surface which contact | connects an adhesive bond layer.

[Polarizing Plate]

The polarizing plate of this invention is obtained by adhering the said cyclic olefin type polymer film to both surfaces of the said polarizing film preferably through the said adhesive agent, and is a polarizing plate which has a cyclic olefin type polymer layer on both surfaces of a polarizing film. At least one layer of the cyclic olefin polymer layer has a transparent conductive layer on a surface opposite to the polarizing film, and typically, only a layer in contact with the spacer is a cyclic olefin polymer layer having a transparent conductive layer. Moreover, since the polarizing plate of this invention is a polarizing plate in which both the polymer layers of both surfaces of a polarizing film contain a cyclic olefin polymer and do not use a TAC film, durability of a transparent conductive layer is maintained over a longer term.

The manufacturing method of such a polarizing plate is not specifically limited, For example, an adhesive is uniformly apply | coated to one surface of a cyclic olefin type polymer film or a polarizing film, the other film (film) is superimposed on a coating surface, and it is bonded by a roll etc. The method of heating or exposing, etc. are mentioned.

At this time, it is preferable to apply | coat an adhesive so that the thickness of the adhesive bond layer after drying may become 0.01-50 micrometers, More preferably, it is 0.01-30 micrometers, Especially preferably, it is 0.01-3 micrometers. If the thickness of the adhesive bond layer after drying exists in the said range, transparency of a polarizing plate will be maintained, and cyclic olefin type polymer film and a polarizing film will adhere | attach with sufficient adhesive force, and these interlayer peelings will hardly arise.

The temperature at the time of applying the adhesive is usually in the range of 15 to 40 ° C, and the bonding temperature is usually in the range of about 15 to 30 ° C. When an ultraviolet curable adhesive agent is used as an adhesive agent, after bonding, it exposes and hardens an adhesive agent. Although the exposure light source at this time is not specifically limited, Preferably it is an ultraviolet-ray. In addition, the exposure amount is preferably 1 to 2000 mJ.

Moreover, as a preferable laminated constitution of the polarizing plate of this invention, the following structures are mentioned, for example. (The following "polymer layer" shows a "cyclic olefin type polymer layer", and the following "hard coating layer" shows an "anti-glare layer or a clear layer")

(1) polymer layer / polarizing film / polymer layer / hard coating layer / transparent conductive layer

(2) polymer layer / polarizing film / polymer layer / adhesive layer or adhesive layer / hard coating layer / polymer layer / hard coating layer / transparent conductive layer

(3) hard coating layer / polymer layer / polarizing film / polymer layer / adhesive layer or adhesive layer / hard coating layer / polymer layer / hard coating layer / transparent conductive layer

Touch panel

The touch panel of the present invention is characterized in that the polarizing plate of the present invention described above is disposed facing the spacer and used as a transparent electrode. The touch panel of the present invention is preferably provided and used on the display surface side of the display device.

Specifically, the polarizing plate of the present invention can be suitably used as an upper electrode and / or a lower electrode of a touch panel of a 4-wire resistive film method or a 5-wire resistive film method. And by arrange | positioning this touch panel in front of a liquid crystal display, the display apparatus which has a touch panel function is obtained.

The polarizing plate according to the present invention has a good polarizing function, is excellent in properties such as heat resistance and chemical resistance, hardly occurs peeling, deformation, change in polarization degree, etc. even in long-term use, has high reliability and is excellent in durability. In addition, since the transparent conductive layer formed on the polarizing plate does not generate cracks over a long period of time, and maintains a low resistance value and is excellent in mechanical durability at high strength, the touch panel of the present invention having the polarizing plate has a high altitude such as for vehicle mounting. It can be used suitably also in the use which requires durability.

Hereinafter, the present invention will be described in more detail based on Examples, but the present invention is not limited to these Examples. In addition, all "parts" are a basis of weight below. In addition, various physical properties were measured or evaluated as follows.

(Light transmittance) The light transmittance of the transparent conductive film layer was measured based on JISK-7361 using the Suga Shiga Co., Ltd. haze meter "HGM-2DP".

(Surface resistance) The surface resistance of the transparent conductive layer was measured using the Mitsubishi Chemical Corporation make of low-resistance meter "Loresta-GP".

(Dry heat test) The resistance value was measured after storing a polarizing plate for 1000 hours in 85 degreeC and 85% RH environment.

Synthesis Example 1 (Synthesis of Cyclic Olefin Polymer)

227.5 parts of 8-methyl-8-methoxycarbonyltetracyclo [4.4.0.1 ^2,5 .1 ^7,10 ] -3-dodecene and 22.5 parts of bicyclo [2.2.1] hept-2-ene, 1- 18 parts of hexene (molecular weight regulator) and 750 parts of toluene (solvent for ring-opening polymerization reaction) were put into the reaction container which carried out the nitrogen substitution, and this solution was heated at 60 degreeC. Then, 0.62 parts of toluene solution of triethylaluminum (1.5 mol / l) and tungsten chloride modified with t-butanol / methanol (t-butanol: methanol: tungsten = 0.35 mol: 0.3 mol: 1) were added to the solution in the reaction vessel. 3.7 parts of toluene solution (concentration 0.05 mol / l) was added, and the ring-opening polymerization reaction was carried out by heating and stirring this system at 80 degreeC for 3 hours, and the ring-opening copolymer solution was obtained. The polymerization conversion rate in this polymerization reaction was 97%.

4,000 parts of the ring-opening copolymer solution thus obtained were put into an autoclave, and 0.48 parts of RuHCl (CO) [P (C ₆ H ₅ ) ₃ ] ₃ was added to the ring-opening copolymer solution, and the hydrogen gas pressure was 100 kg / cm 2, The mixture was heated and stirred for 3 hours under conditions of a reaction temperature of 160 ° C. to carry out a hydrogenation reaction.

After cooling the obtained reaction solution (hydrogenated polymer solution), hydrogen gas was discharged. The reaction solution was poured into a large amount of methanol, the coagulum was separated and recovered, and dried to obtain a hydrogenated cyclic olefin polymer A.

Production Example 1 (Production of Cyclic Olefin Polymer Film)

Polymer A was dissolved in toluene such that the solid content concentration was 30%. The solution viscosity at room temperature of the obtained solution was 30,000 mPa * s. To this solution, 0.1 part by weight of pentaerytrityl tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate] as an antioxidant is added to 100 parts by weight of polymer A The obtained solution was filtered while controlling the flow rate of the solution so that the pressure difference was converged to within 0.4 MPa using a metal fiber sintered filter having a pore diameter of 5 µm manufactured by Nippon Pole, and then installed in a Class 1000 clean room. It applied to 100-micrometer-thick PET film ("Lumier U94" by Toray Corporation) processed by the acrylic acid type surface treatment agent using the "INVEX laboratory coater". . Subsequently, the obtained liquid layer was subjected to the primary drying treatment at 50 ° C. and further to the secondary drying treatment at 90 ° C., and then peeled from the PET film to form a film A-1 having a thickness of 188 μm. The residual solvent amount of the obtained film A-1 was 0.5 wt%, and the light transmittance was 93% or more.

Production Example 2 (Production of Cyclic Olefin Polymer Film)

100 parts of polymer A using a twin screw extruder, 0.3 parts of pentaerytrityl tetrakis-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate and (2,2'-methylene 1.5 parts of bis [4- (1,1,3,3-tetramethylbutyl) -6- (2H-benzotriazol-2-yl) phenol] were melt kneaded at 270 ° C., and then extruded onto a strand, followed by water cooling. Pellets were obtained through a feeder, and the resulting pellets were circulated and dehumidified and dried under nitrogen at 100 ° C. for 3 hours, then sent to a hopper and melted at a resin temperature of 270 ° C. using a single screw extruder having a screw diameter of 75 mm.

The molten resin was guided to a 700 mm wide coat hanger die through a polymer filter (5 µm in eye size) warmed to 280 ° C. at a rate of 30 kg / hr by a biaxially discharged gear pump. The pressure difference between the inlet and outlet of the filter was 3 MPa. In addition, the heater of the die was set to 250 ° C using an aluminum injection heater, and a lip heater was additionally provided to the front lip part, and the die lip temperature was controlled to 250 ± 0.4 ° C.

The lip opening degree was set to 0.5 mm in the width direction, and fine adjustment was performed by measuring the thickness nonuniformity with the on-line thickness measuring instrument provided downstream of melt extrusion. The resin from the die was dropped in the vertical tangential direction of a 250 mm φ cast roll (surface roughness: 0.1 μ), pressed, and then pressed in sequence with two cooling rolls installed horizontally with respect to the cast roll shaft. Tension control was carried out by f, and it acquired and obtained the film A-2 of 80 micrometer thickness. The light transmittance was 93% or more.

Production Example 3 (Manufacture of Polarizing Film)

Polyvinyl alcohol (hereinafter referred to as "PVA") is pre-stretched at a draw ratio of 3 times in a dyeing bath at a temperature of 30 ° C containing an aqueous solution having an iodine concentration of 0.03 wt% and a potassium iodide concentration of 0.5 wt%. Then, in the crosslinking bath at a temperature of 55 ° C. containing an aqueous solution having a boric acid concentration of 5% by weight and a potassium iodide concentration of 8% by weight, post-stretching was performed at a draw ratio twice, followed by drying to obtain a film thickness of 30 μm. The polarizing film of was obtained.

<Preparation Example 1 (Preparation of Adhesive)>

Water was added to 163-03045 (molecular weight 22,000, saponification degree 88 mol%) made by Wako Pure Chemical Industries, Ltd. which is polyvinyl alcohol-type resin, and the aqueous solution which has a solid content concentration of 7 weight% was prepared. On the other hand, CR-5L (effective) of Dainippon Inky Kogyo Co., Ltd. which is a polyepoxy curing agent is made into 100 parts of WLS-201 (solid content concentration 35 weight%) of the Dainippon ink Kagaku Kogyo Co., Ltd. made of polyurethane resin. 5 parts of components 100% of components were combined, and it diluted with water, and prepared the aqueous solution which is 20 weight% of solid content concentration. The obtained polyurethane resin aqueous solution and polyvinyl alcohol resin aqueous solution were mixed in the ratio of weight ratio 1: 1 (80:20 by solid content weight ratio), and the mixed adhesive whose solid content concentration is 15 weight% was prepared.

<Preparation Example 2 (Preparation of a Hard Coating Treatment Agent)>

100 parts of urethane acrylate obtained from pentaerythritol acrylate and hydrogenated xylene diisocyanate, 20 parts of isocyanuric acid-tris [2- (acryloyloxy) ethyl], and the silica particle of average particle diameter about 10 nm of total solid content 10 parts by weight of acrylic particles having an average particle diameter of about 2 μm, 1 part of the total solids, 3% by weight of the photopolymerization initiator 1-hydroxycyclohexylphenylketone, based on the total solids, and butyl acetate / methylethylketone (1/2). The solid coating concentration was diluted to 45% by weight with a mixed solvent of (weight ratio) to prepare a hard coating treatment agent.

Example 1

(Formation of Hard Coating Layer)

The hard coat treatment agent obtained in Preparation Example 2 was applied to one surface of Film A-1 obtained in Production Example 1 by the gravure reverse method. The coated surface was dried at 80 ° C. for 60 seconds, and was irradiated with ultraviolet light of 150 mJ / cm 2 to obtain a film having a hard coating layer having a thickness of 1.7 μm.

Subsequently, a hard coat layer was formed in the same manner on the opposite side to form a film B-1 having a hard coat layer having a film thickness of 1.7 μm on both sides.

(Formation of Transparent Conductive Layer)

The surface of the hard coat layer formed later was subjected to plasma treatment at an Ar flow rate of 200 sccm and an output of 1040 V / 0.02 A, and then subjected to In ₂ O ₃ / SnO ₂ = 90/10 (weight ratio) as a target under inflow of argon gas and oxygen gas. The transparent conductive layer containing ITO was laminated | stacked by thickness of 200 GPa by sputtering using the alloy of the following), and the film C-1 with an amorphous ITO layer was obtained. The surface resistance value of the ITO layer was 450 Ω / square, and no integral peak was observed in the XRD measurement, and it was confirmed that it was amorphous.

(Manufacture of Polarizing Plate and Touch Panel)

Film C-1 (ITO layer is polarized using film B-1 and film C-1, on both surfaces of the polarizing film obtained in manufacture example 3 through the mixed adhesive (thickness of an adhesive layer: 1 micrometer) obtained in manufacture example 1). The polarizing plate of this invention was obtained by laminating | stacking so that it might become the opposite side to a film | membrane) / polarizing film / film B-1.

On the liquid crystal display element, the ITO film transparent substrate for touch panels was superimposed so that an ITO film might be on top, and the polarizing plate obtained through the spacer was overlaid on the transparent conductive layer side below.

It was 495 ohms / square when the obtained liquid crystal display element with a touchscreen was put into the moist heat oven maintained at 85 degreeC and 85% RH, and the resistance value after 1000 hours was measured.

Example 2

Film B-2 and C-2 were obtained like Example 1 except having used film A-2 instead of film A-1. The polarizing plate of this invention was obtained like Example 1 except having used film B-2 instead of film B-1, and using film C-2 instead of film C-1, The liquid crystal display element with a touchscreen Got.

It was 495 ohms / square when the obtained liquid crystal display element with a touchscreen was put into the moist heat oven maintained at 85 degreeC and 85% RH, and the resistance value after 1000 hours was measured.

[Comparative Example]

Film b-1 and c-1 were obtained like Example 1 except having used the cellulose-based resin film "TDY80uL" by a Fujifilm company instead of film A-1. The polarizing plate of this invention was obtained like Example 1 except having used film b-1 instead of film B-1, and using film c-1 instead of film C-1, The liquid crystal display element with a touch panel Got.

It was> 10,000 ohms / square when the obtained liquid crystal display element with a touchscreen was put into the moist heat oven maintained at 85 degreeC and 85% RH, and the resistance value after 1000 hours was measured.

Claims (5)

A cyclic olefin polymer layer is laminated on both surfaces of the polarizing film, and an amorphous transparent conductive layer is laminated on the surface opposite to the polarizing film of at least one cyclic olefin polymer layer directly or through another layer. A polarizing plate characterized by the above. The polarizing plate of Claim 1 in which the cyclic olefin type polymer layer contains the polymer obtained by (co) polymerizing the monomer containing the 1 or more types of compound represented by following formula (1). <Formula 1>

In Formula 1, R ¹ to R ⁴ each independently represent a hydrogen atom; a halogen atom; or a monovalent group which may contain oxygen, nitrogen, sulfur, or silicon, and R ¹ and R ² , or R ³ and R ⁴ May be bonded to each other to form an alkylidene group, or R ¹ and R ² , R ³ and R ⁴ , or R ² and R ³ may be bonded to each other to form a monocyclic or polycyclic carbocyclic or heterocyclic ring, , x is 0 or an integer from 1 to 3, y represents 0 or 1) The polarizing plate of Claim 1 or 2 in which a transparent conductive layer is laminated | stacked on the cyclic olefin type polymer layer through the hard coating layer which disperse | distributes microparticles | fine-particles. It has a polarizing plate in any one of Claims 1-3, The touch panel characterized by the above-mentioned. The touch panel according to claim 4, wherein the touch panel is a vehicle-mounted touch panel.