WO2018159277A1

WO2018159277A1 - Optical laminate

Info

Publication number: WO2018159277A1
Application number: PCT/JP2018/004787
Authority: WO
Inventors: 智永安; 政大藤田
Original assignee: 住友化学株式会社
Priority date: 2017-02-28
Filing date: 2018-02-13
Publication date: 2018-09-07
Also published as: JP2018141962A; CN110325887A; KR20190125990A; TW201841758A; CN113917590A; JP2024003102A; JP2023024446A; CN110325887B; JP7408272B2; KR102484820B1

Abstract

[Problem] To provide an optical laminate which is capable of preventing deterioration of a conductive layer by effectively suppressing migration of a dichroic dye that is contained in a polarizing film to the conductive layer. [Solution] An optical laminate which is obtained by sequentially laminating, on one surface of a polarizing film that contains a dichroic dye in a polyvinyl alcohol resin, a first cured product layer that is configured from a cured product of a curable composition containing a polymerizable compound, an adhesive layer and a conductive layer in this order, and wherein the absorbance increase rate of the first cured product layer as expressed by formula (1) is 30% or less. Absorbance increase rate (%) = (Abs after immersion (360 nm) – Abs before immersion (360 nm))/Abs before immersion (360 nm) × 100 (1)

Description

Optical laminate

The present invention relates to an optical laminate used for an image display panel or the like.

Conventionally, an optical laminate in which a protective film is laminated on one surface of a polarizing film in which a dichroic dye such as iodine is adsorbed and oriented on a polyvinyl alcohol resin film via an adhesive is known. As an adhesive used to constitute such an optical laminate, for example, Patent Document 1 discloses a photocation curable type containing an aliphatic epoxy, an alicyclic epoxy and / or oxetane, and a photopolymerization initiator. An adhesive (curable composition) is described, and a cured product obtained by curing the adhesive functions as an adhesive.

In recent years, transparent conductive films such as indium tin oxide (ITO) thin films have been widely used in display devices. For example, the transparent conductive film is formed on the opposite side of the liquid crystal display device using an in-plane switching (IPS) type liquid crystal cell from the side in contact with the liquid crystal layer of the transparent substrate constituting the liquid crystal cell. It is known to be a layer. The transparent conductive film having the transparent conductive film formed on the transparent resin film is used for an electrode substrate of a touch panel, for example, a liquid crystal display device or an image display device used for a mobile phone, a portable music player, and the like. Input devices using a combination of touch panels have become widespread.

JP 2008-063397 A

However, when a conductive layer such as an ITO layer is laminated on the polarizing film side of the optical laminate described in Patent Document 1 via an adhesive layer, the dichroic dye contained in the polarizing film compares the adhesive layer. May be transmitted to the conductive layer, and may cause malfunction such as poor sensing. Since the movement of the dichroic dye from the polarizing film becomes remarkable particularly in a high temperature and high humidity environment, the dichroic dye contained in the polarizing film is also used in the pressure sensitive adhesive layer even in a high temperature and high humidity environment. Therefore, there is a need for an optical laminate that can prevent deterioration of the conductive layer due to the transition to the conductive layer.

Therefore, an object of the present invention is to provide an optical laminate that can effectively suppress the migration of the dichroic dye contained in the polarizing film to the conductive layer and prevent the deterioration of the conductive layer.

The present invention provides the following preferred embodiments [1] to [6].
[1] A first cured product layer composed of a cured product of a curable composition containing a polymerizable compound on one surface of a polarizing film containing a dichroic dye in a polyvinyl alcohol resin, an adhesive layer, An optical laminate in which the conductive layer is laminated in this order,
The first cured product layer is an optical laminate in which the absorbance increase rate represented by the following formula (1) is 30% or less.
Absorbance increase rate (%) = (Abs after immersion (360 nm) −Abs before immersion (360 nm)) / Abs before immersion (360 nm) × 100 (1)
[In the formula, Abs (360 nm) after immersion indicates the absorbance at 360 nm after the cured product was immersed in an aqueous solution of 50% potassium iodide for 100 hours in an atmosphere at a temperature of 23 ° C. and a relative humidity of 60%. Abs (360 nm) indicates the absorbance at 360 nm before the cured product is immersed in a 50% aqueous potassium iodide solution]
[2] A first cured product layer composed of a cured product of a curable composition containing a polymerizable compound on one surface of a polarizing film containing a dichroic dye in a polyvinyl alcohol-based resin, an adhesive layer, An optical laminate in which the conductive layer is laminated in this order,
The polymerizable compound includes an oxetane compound having two or more oxetanyl groups, and the content of the oxetane compound is 40 parts by mass or more with respect to 100 parts by mass of the total amount of all polymerizable compounds contained in the curable composition. An optical laminate.
[3] The optical laminate according to [1] or [2], wherein the thickness of the first cured product layer is 0.1 to 15 μm.
[4] The optical laminate according to any one of [1] to [3], wherein the cured product constituting the first cured product layer is a photocured product of a curable composition containing the polymerizable compound.
[5] The optical laminate according to any one of [1] to [4], wherein a second cured product layer and a protective film are laminated on the surface of the polarizing film opposite to the first cured product layer. .
[6] The moisture permeability of the protective film is 1200 g at a temperature of 23 ° C. and a relative humidity of 55%.
/ The optical laminated body according to [5], which is 24 hours or shorter.

The optical layered body of the present invention can suppress the movement of the dichroic dye contained in the polarizing film to the conductive layer, and can effectively suppress the corrosion of the conductive layer.

Sectional drawing which shows the structure which is one aspect | mode of the optical laminated body of this invention is represented. Sectional drawing which shows the structure which is one aspect | mode of the optical laminated body of this invention is represented.

Hereinafter, embodiments of the present invention will be described in detail. Note that the scope of the present invention is not limited to the embodiment described here, and various modifications can be made without departing from the spirit of the present invention.

The structure in one embodiment of the optical laminate of the present invention will be described with reference to FIG. 1. The optical laminate 10 of the present invention has a first cured product layer 2 and an adhesive layer 3 on one surface of a polarizing film 1. And the conductive layer 4 are stacked in this order. If necessary, a protective film 6 may be provided on the surface of the polarizing film 1 opposite to the first cured product layer via the second cured product layer 5. In the embodiment of FIG. 1, the conductive layer 4 of the optical laminate 10 is laminated on the substrate X.

Moreover, the optical laminated body of this invention may have the 1st protective film 7 between the 1st hardened | cured material layer 2 and the adhesion layer 3. FIG. This embodiment is shown in FIG. Even if the optical laminated body 10 is equipped with the 2nd protective film 6 via the 2nd hardened | cured material layer 5 in the surface on the opposite side to the 1st hardened | cured material layer 2 of the polarizing film 1 as needed. Good. In the embodiment of FIG. 2, the conductive layer 4 of the optical laminate 10 is laminated on the substrate X.
Hereinafter, each component of the optical layered body of the present invention will be described in detail.

[First cured product layer]
The optical layered body of the present invention is a curable composition containing a polymerizable compound on one surface of a polarizing film containing a dichroic dye in a polyvinyl alcohol resin (hereinafter referred to as curable composition (1)). A first cured product layer composed of a cured product.

The first cured product layer has an absorbance increase rate represented by the following formula (1) of 30% or less.
Absorbance increase rate (%) = (Abs after immersion (360 nm) −Abs before immersion (360 nm)) / Abs before immersion (360 nm) × 100 (1)
[In the formula, Abs (360 nm) after immersion indicates the absorbance at 360 nm after the cured product was immersed in an aqueous solution of 50% potassium iodide for 100 hours in an atmosphere at a temperature of 23 ° C. and a relative humidity of 60%. Abs (360 nm) indicates the absorbance at 360 nm before the cured product is immersed in a 50% aqueous potassium iodide solution]

Even when the first cured product layer is immersed in a 50% aqueous potassium iodide solution for 100 hours, the absorbance increase rate represented by the formula (1) is 30% or less. This indicates that the first cured product layer has relatively low absorbability with respect to iodine (dichroic dye). For this reason, the optical laminated body of this invention can suppress effectively the movement to the 1st hardened | cured material layer of the iodine (dichroic dye) contained in a polarizing film, and the electroconductivity by an iodine (dichroic dye). It is possible to prevent corrosion of the layer (eg, ITO layer). Furthermore, the optical performance of the optical laminate can be maintained.

The absorbance increase rate represented by the formula (1) is preferably 25% or less, more preferably 20% or less, still more preferably 15% or less, and particularly preferably 10% or less. When the absorbance increase rate is less than the above value, the movement of iodine (dichroic dye) contained in the polarizing film to the first cured product layer can be more effectively suppressed as described above, and corrosion of the conductive layer can be achieved. In addition, it is possible to more effectively prevent the optical performance of the optical laminate from being deteriorated.

The polymerizable compound contained in the curable composition (1) is not particularly limited as long as it can form a cured product constituting the first cured product layer. Examples of the polymerizable compound include an active energy ray-curable resin composition, a water-soluble resin composition, a water-dispersible resin composition, and the like. Among these, from the viewpoint of simplifying the process, the active energy ray-curing property is used. A resin composition is preferable, and (meth) acrylate compounds, acrylamide compounds, oxetane compounds, and epoxy compounds containing epoxy acrylate, urethane acrylate, and the like are particularly preferable.

In a preferred embodiment, the cured product constituting the first cured product layer is a photocured product of a curable composition containing a polymerizable compound. For this reason, the polymerizable compound is preferably a photocurable compound.

The polymerizable compound preferably contains an oxetane compound having two or more oxetanyl groups (oxetane ring) in the molecule (hereinafter sometimes referred to as “oxetane compound (A)”).

The oxetane compound (A) is a compound having two or more oxetanyl groups in the molecule, and may be an aliphatic compound, an alicyclic compound, or an aromatic compound. Specific examples of the oxetane compound (A) include 1,4-bis [{(3-ethyloxetane-3-yl) methoxy} methyl] benzene (also called xylylene bisoxetane), bis (3-ethyl- 3-oxetanylmethyl) ether and the like. These oxetane compounds (A) may be used alone or in combination of a plurality of different types. By containing the oxetane compound (A), a dense cured product having a high crosslinking density can be obtained. By providing the cured product layer having a high crosslink density on one surface of the polarizing film, it is possible to effectively suppress the movement of the dichroic dye from the polarizing film.

The content of the oxetane compound (A) is, for example, 40 parts by mass or more, preferably 45 parts by mass or more, more preferably with respect to 100 parts by mass of the total amount of all polymerizable compounds contained in the curable composition (1). Is 50 parts by mass or more. The content of the oxetane compound (A) is preferably 90 parts by mass or less, more preferably 80 parts by mass or less, with respect to 100 parts by mass of the total amount of all polymerizable compounds contained in the curable composition (1). More preferably, it is 70 mass parts or less, Most preferably, it is 65 mass parts or less. Further, the content of the oxetane compound (A) may be a combination of these lower limit value and upper limit value, and the total amount of all polymerizable compounds contained in the curable composition (1) is 100 parts by mass. However, it may be 40 to 65 parts by mass, more preferably 45 to 60 parts by mass.
Moreover, content of an oxetane compound (A) is 35 mass parts or more with respect to 100 mass parts of total amounts of the said curable composition (1), Preferably it is 40 mass parts or more, More preferably, it is 45 mass parts. That's it. When the content of the oxetane compound (A) is not less than the above value, the movement of the dichroic dye contained in the polarizing film to the first cured product layer can be more effectively suppressed, and the corrosion of the conductive layer can be suppressed. In addition, it is possible to more effectively prevent the optical performance of the optical laminate from being deteriorated.

The polymerizable compound preferably further contains an epoxy compound (B). The epoxy compound is preferably (B1) an aliphatic epoxy compound having two or more epoxy groups (hereinafter sometimes referred to as “aliphatic epoxy compound (B1)”), (B2) two or more epoxy groups. An alicyclic epoxy compound (hereinafter sometimes referred to as “alicyclic epoxy compound (B2)”), and (B3) an aromatic epoxy compound having one or more aromatic rings (hereinafter referred to as “aromatic epoxy”). At least one selected from “compound (B3)”.

The aliphatic epoxy compound (B1) is a compound having at least two oxirane rings bonded to an aliphatic carbon atom in the molecule. Examples of the aliphatic epoxy compound (B1) include bifunctional compounds such as 1,4-butanediol diglycidyl ether, 1,6-hexanediol diglycidyl ether, cyclohexane dimethanol diglycidyl ether, neopentyl glycol diglycidyl ether, and the like. Epoxy compounds: Trifunctional or higher functional epoxy compounds such as trimethylolpropane triglycidyl ether, pentaerythritol tetraglycidyl ether, and the like can be mentioned.

When the aliphatic epoxy compound (B1) is included, from the viewpoint of adhesion between the polarizing film and the protective film or the adhesive layer, a bifunctional epoxy compound having two oxirane rings bonded to an aliphatic carbon atom in the molecule (Also referred to as an aliphatic diepoxy compound) is preferred, and an aliphatic diepoxy compound represented by the following formula (I) is more preferred. When the curable composition contains an aliphatic diepoxy compound represented by the following formula (I) as the aliphatic epoxy compound (B1), a curable composition having a low viscosity and easy to apply can be obtained.

In the formula (I), Z is an alkylene group having 1 to 9 carbon atoms, an alkylidene group having 3 or 4 carbon atoms, a divalent alicyclic hydrocarbon group, or a formula —C _m H _2m —Z ¹ —C _n H _It represents a divalent group represented by 2n-. —Z ¹ — represents —O—, —CO—O—, —O—CO—, —SO ₂ —, —SO— or CO—, and m and n each independently represents an integer of 1 or more. However, the sum of m and n is 9 or less.

The divalent alicyclic hydrocarbon group may be, for example, a divalent alicyclic hydrocarbon group having 4 to 8 carbon atoms, such as a divalent residue represented by the following formula (I-1): Is mentioned.

Specific examples of the compound represented by the formula (I) include diglycidyl ethers of alkanediols; diglycidyl ethers of oligoalkylene glycols having up to about 4 repetitions; diglycidyl ethers of alicyclic diols, and the like.

Examples of the diol (glycol) that can form the compound represented by the formula (I) include ethylene glycol, propylene glycol, 1,3-propanediol, 2-methyl-1,3-propanediol, and 2-butyl-2- Ethyl-1,3-propanediol, 1,4-butanediol, neopentyl glycol, 3-methyl-2,4-pentanediol, 2,4-pentanediol, 1,5-pentanediol, 3-methyl-1 , 5-pentanediol, 2-methyl-2,4-pentanediol, 2,4-diethyl-1,5-pentanediol, 1,6-hexanediol, 1,7-heptanediol, 3,5-heptanediol , 1,8-octanediol, 2-methyl-1,8-octanediol, 1,9-nonanediol, etc. Le;
Oligoalkylene glycols such as diethylene glycol, triethylene glycol, tetraethylene glycol and dipropylene glycol;
And alicyclic diols such as cyclohexanediol and cyclohexanedimethanol.

In the present invention, as the aliphatic epoxy compound (B1), 1,4-butanediol diglycidyl ether, 1,6-hexanediol diene is used from the viewpoint that it can be formed into a curable composition having a low viscosity and easy to apply. Glycidyl ether and neopentyl glycol diglycidyl ether are preferred. In view of maintaining optical performance, 1,6-hexanediol diglycidyl ether and pentaerythritol polyglycidyl ether are preferable. As the aliphatic epoxy compound (B1), one kind of aliphatic epoxy compound may be used alone, or a plurality of different kinds may be used in combination.

When curable composition (1) contains an aliphatic epoxy compound (B1), content of an aliphatic epoxy compound (B1) is with respect to 100 mass parts of total amounts of all the polymeric compounds contained in a curable composition. The amount is preferably 1 to 40 parts by mass, more preferably 3 to 30 parts by mass, still more preferably 5 to 20 parts by mass, particularly 7 to 15 parts by mass. When the content of the aliphatic epoxy compound (B1) is in the above range, the curable composition (1) has a low viscosity and can be easily applied.

The alicyclic epoxy compound (B2) is a compound having two or more epoxy groups bonded to the alicyclic ring in the molecule. “Epoxy group bonded to alicyclic ring” means the following formula (a):

A bridging oxygen atom —O— in the structure represented by In the above formula (a), m is an integer of 2 to 5.

A compound in which two or more groups in the form in which one or more hydrogen atoms in (CH ₂ ) _m in the above formula (a) are removed is bonded to another chemical structure is an alicyclic epoxy compound (B2 ) One or more hydrogen atoms in (CH ₂ ) _m may be appropriately substituted with a linear alkyl group such as a methyl group or an ethyl group.

Among them, from the viewpoint of high glass transition temperature of the cured product and excellent adhesion between the polarizing film and the protective film, an epoxycyclopentane structure (m = 3 in the above formula (a)) or an epoxycyclohexane structure An alicyclic epoxy compound having [m = 4 in the above formula (a)] is preferred, and an alicyclic diepoxy compound represented by the following formula (II) is more preferred. By including the alicyclic diepoxy compound represented by the following formula (II) as the compound (B2) in the curable composition (1), the cured product layer after the curable composition is cured has high elasticity. Moreover, the crack by the heat shrink of a polarizing film can be suppressed.

In formula (II), R ¹ and R ² each independently represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and when the alkyl group has 3 or more carbon atoms, it has an alicyclic structure. Also good. The alkyl group having 1 to 6 carbon atoms may be a linear or branched alkyl group, and examples of the alkyl group having an alicyclic structure include a cyclopropyl group, a cyclobutyl group, and a cyclopentyl group.

In the formula (II), X is an oxygen atom, an alkanediyl group having 1 to 6 carbon atoms, or the following formulas (IIa) to (IId):

Represents a divalent group represented by any of the above.
Examples of the alkanediyl group having 1 to 6 carbon atoms include a methylene group, an ethylene group, and a propane-1,2-diyl group.

When X in the formula (II) is a divalent group represented by any one of the formulas (IIa) to (IId), Y ¹ to Y ⁴ in each formula are each independently of 1 to 20 carbon atoms. When it is an alkanediyl group and the alkanediyl group has 3 or more carbon atoms, it may have an alicyclic structure.
a and b each independently represents an integer of 0 to 20.

Examples of the compound represented by the formula (II) include the following compounds A to G. The following chemical formulas A to G correspond to the compounds A to G, respectively.

A: 3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexanecarboxylate B: 3,4-epoxy-6-methylcyclohexylmethyl 3,4-epoxy-6-methylcyclohexanecarboxylate C: ethylenebis (3,4 -Epoxycyclohexanecarboxylate)
D: bis (3,4-epoxycyclohexylmethyl) adipate E: bis (3,4-epoxy-6-methylcyclohexylmethyl) adipate F: diethylene glycol bis (3,4-epoxycyclohexylmethyl ether)
G: Ethylene glycol bis (3,4-epoxycyclohexyl methyl ether)

In the present invention, the alicyclic epoxy compound (B2) is more preferably 3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexanecarboxylate from the viewpoint of easy availability. Further, from the viewpoint that corrosion of the conductive layer can be effectively suppressed, 1,2-epoxy-4- (2-oxiranyl) cyclohexane adduct of 2,2-bis (hydroxymethyl) -1-butanol is preferable. In particular, a combination of 3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexanecarboxylate and 1,2-epoxy-4- (2-oxiranyl) cyclohexane adduct of 2,2-bis (hydroxymethyl) -1-butanol When used as an alicyclic epoxy compound (B2), corrosion of the conductive layer can be more effectively suppressed. As the alicyclic epoxy compound (B2), one type of alicyclic epoxy compound may be used alone, or a plurality of different types may be used in combination.

When curable composition (1) contains an alicyclic epoxy compound (B2), content of alicyclic epoxy compound (B2) is the total amount of all the polymerizable compounds contained in curable composition (1) 100. The amount is preferably 3 to 70 parts by mass, more preferably 10 to 60 parts by mass, still more preferably 20 to 55 parts by mass, and particularly preferably 25 to 50 parts by mass with respect to parts by mass. When the content of the alicyclic epoxy compound (B2) is in the above range, curing by irradiation with active energy rays such as ultraviolet rays proceeds rapidly, and a cured product layer having sufficient hardness can be easily formed. .

The aromatic epoxy compound (B3) is a compound having one or more aromatic rings in the molecule, and specific examples thereof include the following.
Monohydric phenol having at least one aromatic ring such as phenol, cresol, butylphenol or the like, or a mono / polyglycidyl etherified product of an alkylene oxide adduct thereof, such as bisphenol A, bisphenol F, or a compound obtained by further adding an alkylene oxide thereto Glycidyl etherified products and epoxy novolac resins;
A glycidyl ether of an aromatic compound having two or more phenolic hydroxyl groups such as resorcinol, hydroquinone, catechol;
Mono / polyglycidyl etherified products of aromatic compounds having two or more alcoholic hydroxyl groups such as benzenedimethanol, benzenediethanol, benzenedibutanol;
Glycidyl esters of polybasic aromatic compounds having two or more carboxylic acids such as phthalic acid, terephthalic acid, trimellitic acid;
Glycidyl esters of benzoic acids such as benzoic acid, toluic acid, naphthoic acid;
Epoxidized styrene oxide or divinylbenzene.

When the aromatic epoxy compound (B3) is included, from the viewpoint of reducing the viscosity of the curable composition, glycidyl ether of phenols, glycidyl etherified products of aromatic compounds having two or more alcoholic hydroxyl groups, polyhydric phenols It preferably contains at least one selected from the group consisting of glycidyl etherified products, glycidyl esters of benzoic acids, glycidyl esters of polybasic acids, styrene oxide or epoxidized products of divinylbenzene.
Further, in order to improve the curability of the curable composition, the aromatic epoxy compound (B3) preferably has an epoxy equivalent of 80 to 500.
As the aromatic epoxy compound (B3), one kind of aromatic epoxy compound may be used alone, or a plurality of different kinds may be used in combination.

As the aromatic epoxy compound (B3), commercially available products can be used. For example, Denacol EX-121, Denacol EX-141, Denacol EX-142, Denacol EX-145, Denacol EX-146, Denacol EX-147, Denacol EX-201, Denacol EX-203, Denacol EX-711, Denacol EX-721, On Coat EX-1020, On Coat EX-1030, On Coat EX-1040, On Coat EX-1050, On Coat EX-1051, ONCOAT EX-1010, ONCOAT EX-1011, ONCOAT 1012 (above, manufactured by Nagase ChemteX Corporation); Ogusol PG-100, Ogusol EG-200, Ogusol EG-210, Ogusol EG-250 (above, Osaka Gas Chemical) HP4032, HP4032D, HP4700 (manufactured by DIC); ESN-475V (manufactured by Nippon Steel & Sumikin Chemical Co., Ltd.); Epicoat YX8800, jER828EL (manufactured by Mitsubishi Chemical); Marproof G-0105SA, Marproof G-0130SP ( Manufactured by NOF Corporation); Epicron N-665, Epicron HP-7200 (manufactured by DIC Corporation); EOCN-1020, EOCN-102S, EOCN-103S, EOCN-104S, XD-1000, NC-3000, EPPN-501H EPPN-501HY, EPPN-502H, NC-7000L (above, Nippon Kayaku Co., Ltd.); Adekaglycilol ED-501, Adekaglycilol ED-502, Adekaglycilol ED-509, Adekaglycilol ED-529, Adeka Resin E -4000, Adecaresin EP-4005, ADEKA RESIN EP-4100, ADEKA RESIN EP-4901 (manufactured by ADEKA Corporation); TECHMORE VG-3101L, EPOX-MKR710, EPOX-MKR151 (or, purine Tech Co., Ltd.) and the like.

When the curable composition contains the aromatic epoxy compound (B3), the curable composition becomes a hydrophobic resin, and the cured product layer obtained thereby becomes hydrophobic. For this reason, the penetration | invasion of the water | moisture content from the outside under high temperature high humidity can be prevented, and the movement of the dichroic dye (iodine) contained in a polarizing film can be suppressed effectively.

When the curable composition (1) contains the aromatic epoxy compound (B3), the content of the aromatic epoxy compound (B3) is 100 mass of the total polymerizable compound contained in the curable composition (1). The amount is preferably 1 to 70 parts by mass, more preferably 5 to 60 parts by mass, still more preferably 7 to 55 parts by mass, and particularly preferably 10 to 50 parts by mass with respect to parts. When the content of the aromatic epoxy compound (B3) is in the above range, the hydrophobicity of the cured product layer can be improved, and the permeability of the dichroic dye (iodine) to the cured product layer can be reduced.

When curable composition (1) contains oxetane compound (A) and alicyclic epoxy compound (B2), content of alicyclic epoxy compound (B2) with respect to content (WA) of oxetane compound (A) The mass ratio (WB2 / WA) of the amount (WB2) is preferably 0.05 to 1.5.
When curable composition (1) contains oxetane compound (A) and aliphatic epoxy compound (B1), content of aliphatic epoxy compound (B1) with respect to content (WA) of oxetane compound (A) ( The mass ratio (WB1 / WA) of WB1) is preferably 0.1 to 0.5.
When curable composition (1) contains oxetane compound (A) and aromatic epoxy compound (B3), content of aromatic epoxy compound (B1) with respect to content (WA) of oxetane compound (A) ( The mass ratio (WB3 / WA) of WB3) is preferably 0.1 to 1.5.

The curable composition (1) may contain a polymerizable compound other than the oxetane compound (A) and the epoxy compound (B). Specific examples include aliphatic monoepoxy compounds and alicyclic monoepoxy compounds.

The content of the polymerizable compound contained in the curable composition (1) is preferably 80 to 100 parts by mass, more preferably 90 to 99.99 parts by mass with respect to 100 parts by mass of the total mass of the curable composition (1). The amount is 5 parts by mass, more preferably 95 to 99 parts by mass. When content of a polymeric compound exists in the said range, the movement to the 1st hardened | cured material layer of the dichroic dye contained in a polarizing film can be suppressed more effectively.

The curable composition usually contains a polymerization initiator for initiating polymerization. The polymerization initiator may be a photopolymerization initiator (for example, a photocationic polymerization initiator or a radical photopolymerization initiator) or a thermal polymerization initiator. For example, when a curable composition contains the said oxetane compound (A), an epoxy compound (B), etc. as a polymeric compound, it is preferable to use a photocationic polymerization initiator for a polymerization initiator.

The cationic photopolymerization initiator generates a cationic species or a Lewis acid by irradiation with active energy rays such as visible light, ultraviolet rays, X-rays, or electron beams, and initiates a polymerization reaction of the cationically polymerizable compound. . Since the cationic photopolymerization initiator acts catalytically by light, it is excellent in storage stability and workability even when mixed with a polymerizable compound. Examples of the compound that generates a cationic species or a Lewis acid upon irradiation with active energy rays include onium salts such as aromatic iodonium salts and aromatic sulfonium salts, aromatic diazonium salts, and iron-arene complexes.

The aromatic iodonium salt is a compound having a diaryl iodonium cation, and typical examples of the cation include a diphenyl iodonium cation. The aromatic sulfonium salt is a compound having a triarylsulfonium cation, and typical examples of the cation include a triphenylsulfonium cation and a 4,4′-bis (diphenylsulfonio) diphenylsulfide cation. The aromatic diazonium salt is a compound having a diazonium cation, and typical examples of the cation include a benzenediazonium cation. The iron-arene complex is typically a cyclopentadienyl iron (II) arene cation complex salt.

The cation shown above forms a photocationic polymerization initiator in combination with an anion (anion). As anions constituting the photocationic polymerization initiator, special phosphorus anions [(Rf) _n PF _6-n ] ⁻ , hexafluorophosphate anion PF ₆ ⁻ , hexafluoroantimonate anion SbF ₆ ⁻ , pentafluorohydroxyantimonate Anion SbF ₅ (OH) ⁻ , hexafluoroarsenate anion AsF ₆ ⁻ , tetrafluoroborate anion BF ₄ ⁻ , tetrakis (pentafluorophenyl) borate anion B (C ₆ F ₅ ) ₄ ^{— and the} like can be mentioned. Among them, from the viewpoint of safety of the curability and the resulting cured product layer of a polymerizable compound, cationic photopolymerization initiator special phosphorus-based anion _{[(Rf) n PF 6-} n] -, hexafluorophosphate anion PF ₆ ^- It is preferable that

The photocationic polymerization initiator may be used alone or in combination with a plurality of different types. Among these, aromatic sulfonium salts are preferable because they have ultraviolet absorption characteristics even in a wavelength region near 300 nm, and are excellent in curability and can provide a cured product having good mechanical strength and adhesive strength.

The content of the polymerization initiator in the curable composition (1) is usually 0.5 to 10 parts by weight, preferably 6 parts by weight or less, more preferably 3 parts by weight with respect to 100 parts by weight of the polymerizable compound. Or less. When the content of the polymerization initiator is within the above range, the polymerizable compound can be sufficiently cured, and high mechanical strength and adhesive strength can be given to the cured product layer formed from the obtained cured product. . On the other hand, if the amount is excessively large, the product from the cationic photopolymerization initiator may react with the hydroxyl group of polyvinyl alcohol constituting the polarizing film, thereby reducing the optical performance of the polarizing film.

In the present invention, the curable composition (1) can contain additives generally used in the curable composition as necessary. Examples of such additives include ion trapping agents, antioxidants, chain transfer agents, polymerization accelerators (polyols, etc.), sensitizers, sensitization aids, light stabilizers, tackifiers, thermoplastic resins. , Fillers, flow regulators, plasticizers, antifoaming agents, leveling agents, silane coupling agents, dyes, antistatic agents, ultraviolet absorbers and the like.

Examples of the sensitizer include a photosensitizer. The photosensitizer is a compound that exhibits maximum absorption at a wavelength longer than the maximum absorption wavelength exhibited by the photocationic polymerization initiator and promotes the polymerization initiation reaction by the photocationic polymerization initiator. The photosensitizing aid is a compound that further promotes the action of the photosensitizer. Depending on the type of the protective film, it is preferable to blend such a photosensitizer and further a photosensitization aid. By blending these photosensitizers and photosensitization aids, a cured product having desired performance can be formed even when a film having low UV transmittance is used.

The photosensitizer is preferably a compound that exhibits maximum absorption in light having a wavelength longer than 380 nm, for example. Examples of the photosensitizer include anthracene compounds described below.
9,10-dimethoxyanthracene,
9,10-diethoxyanthracene,
9,10-dipropoxyanthracene,
9,10-diisopropoxyanthracene,
9,10-dibutoxyanthracene,
9,10-dipentyloxyanthracene,
9,10-dihexyloxyanthracene,
9,10-bis (2-methoxyethoxy) anthracene,
9,10-bis (2-ethoxyethoxy) anthracene,
9,10-bis (2-butoxyethoxy) anthracene,
9,10-bis (3-butoxypropoxy) anthracene,
2-methyl- or 2-ethyl-9,10-dimethoxyanthracene,
2-methyl- or 2-ethyl-9,10-diethoxyanthracene,
2-methyl- or 2-ethyl-9,10-dipropoxyanthracene,
2-methyl- or 2-ethyl-9,10-diisopropoxyanthracene,
2-methyl- or 2-ethyl-9,10-dibutoxyanthracene,
2-methyl- or 2-ethyl-9,10-dipentyloxyanthracene,
2-Methyl- or 2-ethyl-9,10-dihexyloxyanthracene.

The curable composition (1) is obtained by mixing a polymerizable compound, a polymerization initiator, and additives as necessary. A 1st hardened | cured material layer apply | coats a curable composition (1) on this polarizing film or on this 1st protective film, when using a 1st protective film, and active energy rays, such as an ultraviolet-ray and an electron beam, are applied. It can be formed by curing the applied curable composition by irradiation.

For coating of the curable composition (1), various coating methods such as a doctor blade, a wire bar, a die coater, a comma coater, and a gravure coater can be used. Examples of the light source for curing the curable composition (1) include an active energy ray light source. The light source of the active energy ray may be any light source that generates ultraviolet rays, electron beams, X-rays, and the like. In particular, a light source having a light emission distribution at a wavelength of 400 nm or less is preferable, and examples thereof include a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, an ultrahigh pressure mercury lamp, a chemical lamp, a black light lamp, a microwave excitation mercury lamp, and a metal halide lamp.

Light irradiation intensity at the time of curing the curable composition (1) is different for each composition, the light irradiation intensity of the wavelength region effective for activation of the polymerization initiator is 0.1 ~ 1000mW / cm ² It is preferable. If the light irradiation intensity at the time of curing of the curable composition (1) is too small, the time required for the reaction to proceed sufficiently increases, and conversely, if the light irradiation intensity is too large, the heat radiated from the lamp. In addition, heat generated during polymerization of the curable composition (1) may cause deterioration of a film to be attached. The light irradiation time at the time of curing of the curable composition (1) is controlled for each composition and is not particularly limited, but the integrated light amount expressed as the product of the light irradiation intensity and the light irradiation time is 10. It is preferable to set it to ˜5000 mJ / cm ² . If the integrated light quantity is too small, the generation of active species derived from the polymerization initiator is not sufficient, and the resulting curing may be insufficient. On the other hand, if the integrated light quantity is too large, the irradiation time becomes very long, which is disadvantageous for improving productivity.

In the case where the curable composition is cured by irradiation with active energy rays, for example, the polarization degree of the polarizing film, the transmittance and the hue, and the transparency of various films constituting the protective film and the optical layer, for example, It is preferable to perform the curing under conditions that do not deteriorate the various functions.

In the optical laminate of the present invention, the thickness of the first cured product layer is not particularly limited, but is preferably 0.1 to 15 μm, more preferably 0.5 to 10 μm, and still more preferably 0.5. ~ 7 μm. When the thickness of the first cured product layer is at least the lower limit value, the movement of the dichroic dye can be effectively suppressed, and when it is at most the upper limit value, the curable composition can be sufficiently cured. .

In the optical layered body of the present invention, the absorbance increase rate of the first cured product layer is 30%, and the absorbability with respect to the dichroic dye is relatively low. Usually, in a high-temperature and high-humidity environment, the movement of the dichroic dye can be accelerated by the ingress of moisture from the outside. However, in the optical laminate of the present invention, the first curing of the dichroic dye contained in the polarizing film is performed. The movement to the physical layer can be effectively suppressed. For this reason, even when placed in a high-temperature and high-humidity environment, corrosion of the conductive layer can be effectively prevented, and optical performance can be maintained. Further, when the pressure-sensitive adhesive layer constituting the optical laminate includes an ionic compound as an antistatic agent, for example, the ionic compound present in the pressure-sensitive adhesive layer is transmitted through the protective film constituting the optical laminate and polarized. It may move to a film and cause an interaction with the dichroic dye in the polarizing film to deteriorate the optical performance of the optical laminate. Since the first cured product layer is present between the polarizing film and the adhesive layer, the optical laminate of the present invention can effectively suppress the movement of the ionic compound from the adhesive layer. The deterioration of the optical performance of the body can be prevented.
In addition, the 1st hardened | cured material layer also plays the role as an adhesive bond layer which adhere | attaches a polarizing film, a protective film, or an adhesion layer. In that case, it is possible to prevent a decrease in the optical performance of the optical laminate, particularly in a protective film through which an ionic compound or the like is easily transmitted.

(Adhesive layer)
As the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer, conventionally known pressure-sensitive adhesives can be used without particular limitation. For example, an acrylic resin, a rubber-based resin, a urethane-based resin, a silicone-based resin, a polyvinyl ether-based resin, or the like is used as a base polymer. Can be used. Further, an energy ray curable pressure sensitive adhesive, a thermosetting pressure sensitive adhesive, or the like may be used. Among these, an adhesive having a base polymer of an acrylic resin that is excellent in transparency, adhesive strength, reworkability, weather resistance, heat resistance, and the like is preferable.

In the present invention, when the adhesive layer contains an acrylic resin, the acrylic resin is not particularly limited, and conventionally known ones can be used. Among these, from the viewpoint of adhesiveness and reworkability, the adhesive layer contained in the optical laminate of the present invention preferably contains the following acrylic resin (P).

The acrylic resin (P) has the following formula (III):

[Wherein, R _a represents a hydrogen atom or a methyl group, and R _b represents an alkyl group having 1 to 14 carbon atoms which may be substituted with an alkoxy group having 1 to 10 carbon atoms]
An unsaturated monomer (P2) having a structural unit derived from (meth) acrylic acid alkyl ester (P1) as a main component and further having a polar functional group (hereinafter referred to as “polar functional group-containing monomer”) An acrylic resin containing a structural unit derived from
Here, in the present specification, (meth) acrylic acid means that either acrylic acid or methacrylic acid may be used, and in addition, “(meth)” when referred to as (meth) acrylate or the like has the same purpose. It is.

Examples of the (meth) acrylic acid alkyl ester (P1) represented by the formula (III) include methyl acrylate, ethyl acrylate, propyl acrylate, n-butyl acrylate, n-octyl acrylate, and lauryl acrylate. Linear alkyl acrylates; branched alkyl acrylates such as isobutyl acrylate, 2-ethylhexyl acrylate, and isooctyl acrylate; methyl methacrylate, ethyl methacrylate, propyl methacrylate, n-methacrylate Linear alkyl methacrylates such as butyl, n-octyl methacrylate, and lauryl methacrylate; branched alkyl esters such as isobutyl methacrylate, 2-ethylhexyl methacrylate, and isooctyl methacrylate 2-methoxyethyl acrylate, ethoxymethyl acrylate, methacrylate, 2-methoxyethyl, and methacrylate ethoxymethyl and the like.
Among these, n-butyl acrylate is preferable, and specifically, n-butyl acrylate is preferably 50% by mass or more based on the total amount of all monomers constituting the acrylic resin (P). These (meth) acrylic acid alkyl esters (P1) may be used alone or in combination of two or more different types.

In the polar functional group-containing monomer (P2), examples of the polar functional group include a free carboxyl group, a hydroxyl group, an amino group, and a heterocyclic group including an epoxy group. The polar functional group-containing monomer (P2) is preferably a (meth) acrylic acid compound having a polar functional group. Examples thereof include unsaturated monomers having a free carboxyl group such as acrylic acid, methacrylic acid, and β-carboxyethyl acrylate; 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, ( Unsaturated monomers having a hydroxyl group such as 2-methacrylic acid 2- or 3-chloro-2-hydroxypropyl and diethylene glycol mono (meth) acrylate; acryloylmorpholine, vinylcaprolactam, N-vinyl-2-pyrrolidone, tetrahydrofur Unsaturated monocyclic compounds having heterocyclic groups such as furyl (meth) acrylate, caprolactone-modified tetrahydrofurfuryl acrylate, 3,4-epoxycyclohexylmethyl (meth) acrylate, glycidyl (meth) acrylate, and 2,5-dihydrofuran Body; N, and the like unsaturated monomer having a different amino groups and heterocyclic rings such as N- dimethylaminoethyl (meth) acrylate. These polar functional group-containing monomers may be used singly or in a plurality of different types.

The polar functional group-containing monomer (P2) is preferably an unsaturated monomer having a hydroxyl group. In addition to the unsaturated monomer having a hydroxyl group, it is also effective to use an unsaturated monomer having another polar functional group, for example, an unsaturated monomer having a free carboxyl group.

In the acrylic resin (P), the structural unit derived from the (meth) acrylic acid alkyl ester (P1) represented by the formula (III) is 100 parts by mass in total of all the structural units constituting the acrylic resin (P). For example, 50 to 100 parts by mass. The structural unit derived from the polar functional group-containing monomer (P2) is, for example, 0.1 to 20 parts by mass with respect to 100 parts by mass of the total amount of all structural units constituting the acrylic resin (P).

The acrylic resin (P) includes a structural unit derived from a monomer different from the (meth) acrylic acid alkyl ester (P1) and the polar functional group-containing monomer (P2) represented by the formula (III). May be. Examples thereof include an unsaturated monomer (P3) having one olefinic double bond and at least one aromatic ring in the molecule (hereinafter sometimes referred to as “aromatic ring-containing monomer”). A structural unit derived from (a), a structural unit derived from a (meth) acrylic acid ester having an alicyclic structure in the molecule, a structural unit derived from a styrene monomer, a structural unit derived from a vinyl monomer And a structural unit derived from a monomer having a plurality of (meth) acryloyl groups in the molecule.

The unsaturated monomer (aromatic ring-containing monomer) (P3) having one olefinic double bond and at least one aromatic ring in the molecule is a group containing an olefinic double bond (meta ) Those having an acryloyl group are preferred. Examples thereof include benzyl (meth) acrylate, neopentyl glycol benzoate (meth) acrylate, etc. Among them, formula (IV):

Wherein, R ₃ represents a hydrogen atom or a methyl group, n is an integer of 1 ~ 8, R ₄ is a hydrogen atom, an alkyl group having 1-9 carbon atoms, an aralkyl group or C 7 to 11 carbon atoms Represents an aryl group of formula 6-10]
An aromatic ring-containing (meth) acrylic compound represented by

Examples of the alkyl group having 1 to 9 carbon atoms include methyl, butyl and nonyl. Examples of the aralkyl group having 7 to 11 carbon atoms include benzyl, phenethyl, naphthylmethyl and the like. Examples of the aryl group having 6 to 10 carbon atoms include phenyl, tolyl, naphthyl and the like.

Examples of the aromatic ring-containing (meth) acrylic compound represented by the formula (IV) include (meth) acrylic acid 2-phenoxyethyl, (meth) acrylic acid 2- (2-phenoxyethoxy) ethyl, and ethylene oxide-modified nonylphenol (meth) ) Acrylic acid ester, 2- (o-phenylphenoxy) ethyl (meth) acrylate, and the like. These aromatic ring-containing monomers may be used alone or in combination of a plurality of different types. Among these, 2-phenoxyethyl (meth) acrylate [a compound of R ₄ = H and n = 1 in the above formula (IV)], 2- (o-phenylphenoxy) ethyl (meth) acrylate [the above formula In (IV), R ₄ = o-phenyl, compound of n = 1], or 2- (2-phenoxyethoxy) ethyl (meth) acrylate [in the above formula (IV), R ₄ = H, n = 2 Of the aromatic ring-containing monomer (P3) constituting the acrylic resin (P).

The alicyclic structure in the structural unit derived from the (meth) acrylic acid ester having an alicyclic structure in the molecule is a cycloparaffin structure having usually 5 or more carbon atoms, preferably 5 to 7 carbon atoms. Specific examples of the acrylate ester having an alicyclic structure include isobornyl acrylate, cyclohexyl acrylate, dicyclopentanyl acrylate, cyclododecyl acrylate, methylcyclohexyl acrylate, trimethylcyclohexyl acrylate, and tert-butyl acrylate. Examples of methacrylic acid esters having an alicyclic structure include isobornyl methacrylate, cyclohexyl methacrylate, dicyclopentanyl methacrylate, methacrylic acid, and the like, such as cyclohexyl, α-ethoxyacrylate cyclohexyl, and cyclohexyl phenyl acrylate. Cyclododecyl, methyl cyclohexyl methacrylate, trimethyl cyclohexyl methacrylate, tert-butyl cyclohexyl methacrylate, cyclohexyl methacrylate Phenyl and the like.

Specific examples of the styrenic monomer include styrene, methyl styrene, dimethyl styrene, trimethyl styrene, ethyl styrene, diethyl styrene, triethyl styrene, propyl styrene, butyl styrene, hexyl styrene, heptyl styrene, octyl styrene, and the like. Alkyl styrenes; halogenated styrenes such as fluorostyrene, chlorostyrene, bromostyrene, dibromostyrene, and iodostyrene; and nitrostyrene, acetylstyrene, methoxystyrene, divinylbenzene, and the like.

Specific examples of vinyl monomers include fatty acid vinyl esters such as vinyl acetate, vinyl propionate, vinyl butyrate, vinyl 2-ethylhexanoate, and vinyl laurate; halogenations such as vinyl chloride and vinyl bromide. Vinyl; vinylidene halides such as vinylidene chloride; nitrogen-containing aromatic vinyls such as vinyl pyridine, vinyl pyrrolidone, and vinyl carbazole; conjugated diene monomers such as butadiene, isoprene, and chloroprene; and acrylonitrile, methacrylate Ronitrile etc. can be mentioned.

Specific examples of the monomer having a plurality of (meth) acryloyl groups in the molecule include 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, and 1,9-nonane. In the molecule, such as diol di (meth) acrylate, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, and tripropylene glycol di (meth) acrylate, ) Monomers having an acryloyl group; monomers having three (meth) acryloyl groups in the molecule such as trimethylolpropane tri (meth) acrylate can be mentioned.

Monomers different from the (meth) acrylic acid alkyl ester (P1) and the polar functional group-containing monomer (P2) represented by the formula (III) may be used alone or in combination of two or more. it can. When included in the adhesive, in the acrylic resin (P), the structural unit derived from a monomer different from the (meth) acrylic acid alkyl ester (P1) and the polar functional group-containing monomer (P2) is an acrylic resin. The amount is usually 0 to 30 parts by mass with respect to 100 parts by mass as the total amount of all structural units constituting (P).

The resin component constituting the pressure-sensitive adhesive composition is an acrylic resin containing a structural unit derived from the (meth) acrylic acid alkyl ester (P1) and the polar functional group-containing monomer (P2) represented by the formula (III). Two or more types may be included. In addition, an acrylic resin different from the acrylic resin (P), for example, an acrylic resin having a structural unit derived from a (meth) acrylic acid alkyl ester of the formula (III) and containing no polar functional group is mixed. May be used. The acrylic resin (P) containing a structural unit derived from the (meth) acrylic acid alkyl ester (P1) and the polar functional group-containing monomer (P2) represented by the formula (III) is an acrylic resin contained in the adhesive layer For example, it may be 70 parts by mass or more with respect to the total amount of 100 parts by mass.

The acrylic resin (P), which is a copolymer of a monomer mixture containing the (meth) acrylic acid alkyl ester (P1) represented by the formula (III) and the polar functional group-containing monomer (P2), is gel permeation. It is preferable that the weight average molecular weight Mw in terms of standard polystyrene by the chromatography chromatography (GPC) is in the range of 1 million to 2 million. When the weight average molecular weight in terms of standard polystyrene is within the above range, the adhesiveness under high temperature and high humidity is improved, and there is a tendency that the possibility of peeling or floating between the conductive layer and the adhesive layer is reduced. Furthermore, reworkability tends to be improved. Further, even if the dimension of the polarizing film changes, the adhesive layer easily follows the change in dimension, and for example, when the optical laminate is bonded to the liquid crystal cell, the brightness and center of the peripheral edge of the liquid crystal cell There is no difference between the brightness and the whiteness and the color unevenness tends to be suppressed.

The molecular weight distribution represented by the ratio Mw / Mn between the weight average molecular weight Mw and the number average molecular weight Mn is preferably in the range of 3-7. When the molecular weight distribution Mw / Mn is in the range of 3 to 7, the occurrence of defects such as white spots can be suppressed even when the liquid crystal display panel or the liquid crystal display device is exposed to a high temperature.

The acrylic resin (P) preferably has a glass transition temperature in the range of −10 to −60 ° C. from the viewpoint of developing adhesiveness. The glass transition temperature of the resin can generally be measured with a differential scanning calorimeter.

The acrylic resin (P) can be produced by various known methods such as a solution polymerization method, an emulsion polymerization method, a bulk polymerization method, and a suspension polymerization method. In the production of the acrylic resin (P), a polymerization initiator is usually used. The content of the polymerization initiator is preferably 0.001 to 5 parts by mass with respect to 100 parts by mass in total of all monomers used for the production of the acrylic resin.

As the polymerization initiator, a thermal polymerization initiator, a photopolymerization initiator, or the like is used. Examples of the photopolymerization initiator include 4- (2-hydroxyethoxy) phenyl (2-hydroxy-2-propyl) ketone. Examples of thermal polymerization initiators include 2,2′-azobisisobutyronitrile, 2,2′-azobis (2-methylbutyronitrile), 1,1′-azobis (cyclohexane-1-carbonitrile), 2,2′-azobis (2,4-dimethylvaleronitrile), 2,2′-azobis (2,4-dimethyl-4-methoxyvaleronitrile), dimethyl-2,2′-azobis (2-methylpropio) And azo compounds such as 2,2′-azobis (2-hydroxymethylpropionitrile); lauryl peroxide, tert-butyl hydroperoxide, benzoyl peroxide, tert-butyl peroxybenzoate, cumene hydroper Oxide, diisopropyl peroxydicarbonate, dipropyl peroxydicarbonate, te Organic peroxides such as t-butyl peroxyneodecanoate, tert-butyl peroxypivalate, and (3,5,5-trimethylhexanoyl) peroxide; potassium persulfate, ammonium persulfate, and hydrogen peroxide And inorganic peroxides. A redox initiator using a peroxide and a reducing agent in combination can also be used as the polymerization initiator.

As a method for producing the acrylic resin (P), a solution polymerization method is particularly preferable. A specific example of the solution polymerization method will be described. A desired monomer and an organic solvent are mixed, a thermal polymerization initiator is added under a nitrogen atmosphere, and a temperature of 40 to 90 ° C., preferably 50 to 80 ° C. is set. A method of stirring for ˜10 hours can be mentioned. Moreover, in order to control reaction, you may add a monomer and a thermal-polymerization initiator continuously or intermittently during superposition | polymerization, or may be added in the state melt | dissolved in the organic solvent. Here, examples of the organic solvent include aromatic hydrocarbons such as toluene and xylene; esters such as ethyl acetate and butyl acetate; aliphatic alcohols such as propyl alcohol and isopropyl alcohol; acetone, methyl ethyl ketone, and methyl isobutyl. Ketones such as ketones can be used.

The adhesive layer contained in the optical layered body of the present invention is preferably composed of an acrylic resin (P) and a crosslinking agent in combination. The crosslinking agent is a compound that reacts with a structural unit derived from the polar functional group-containing monomer (P2) in the acrylic resin (P) to crosslink the acrylic resin. Specific examples include isocyanate compounds, epoxy compounds, aziridine compounds, metal chelate compounds, and the like. Among these, the isocyanate compound, the epoxy compound, and the aziridine compound have at least two functional groups in the molecule that can react with the polar functional group in the acrylic resin (P).

Isocyanate compounds are compounds having at least two isocyanato groups (—NCO) in the molecule, such as tolylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, hydrogenated xylylene diisocyanate, diphenylmethane diisocyanate, Examples thereof include hydrogenated diphenylmethane diisocyanate, naphthalene diisocyanate, and triphenylmethane triisocyanate. In addition, adducts obtained by reacting these isocyanate compounds with polyols such as glycerol and trimethylolpropane, and those obtained by converting isocyanate compounds to dimers and trimers can also be used as a crosslinking agent for pressure-sensitive adhesives. . Two or more isocyanate compounds can be mixed and used.

The epoxy compound is a compound having at least two epoxy groups in the molecule, for example, bisphenol A type epoxy resin, ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, glycerin diglycidyl ether, glycerin triglycidyl ether. 1,6-hexanediol diglycidyl ether, trimethylolpropane triglycidyl ether, N, N-diglycidylaniline, N, N, N ′, N′-tetraglycidyl-m-xylenediamine, 1,3-bis ( N, N′-diglycidylaminomethyl) cyclohexane and the like. Two or more types of epoxy compounds can be mixed and used.

An aziridine-based compound is a compound having at least two 3-membered ring skeletons composed of one nitrogen atom and two carbon atoms, also called ethyleneimine, for example, diphenylmethane-4,4′-bis ( 1-aziridinecarboxamide), toluene-2,4-bis (1-aziridinecarboxamide), triethylenemelamine, isophthaloylbis-1- (2-methylaziridine), tris-1-aziridinylphosphine oxide, hexamethylene 1,6-bis (1-aziridinecarboxamide), trimethylolpropane, tris-β-aziridinylpropionate, tetramethylolmethane, tris-β-aziridinylpropionate, and the like.

As the metal chelate compound, for example, acetylacetone or ethyl acetoacetate is coordinated to a polyvalent metal such as aluminum, iron, copper, zinc, tin, titanium, nickel, antimony, magnesium, vanadium, chromium, and zirconium. Compound etc. are mentioned.

Among these cross-linking agents, isocyanate compounds, especially xylylene diisocyanate, tolylene diisocyanate or hexamethylene diisocyanate, or adducts obtained by reacting these isocyanate compounds with polyols such as glycerol and trimethylolpropane, Those obtained by making these isocyanate compounds into dimers, trimers or the like, or those obtained by mixing these isocyanate compounds are preferably used. In particular, when the polar functional group-containing monomer (P2) has a polar functional group selected from a free carboxyl group, a hydroxyl group, an amino group, and an epoxy group, it is preferable to use at least one isocyanate compound as a crosslinking agent. . Among them, tolylene diisocyanate, adducts obtained by reacting tolylene diisocyanate with polyols, tolylene diisocyanate dimers, and tolylene diisocyanate trimers, hexamethylene diisocyanate, hexamethylene diisocyanate are suitable isocyanate compounds. Are adducts obtained by reacting with a polyol, a dimer of hexamethylene diisocyanate, and a trimer of hexamethylene diisocyanate.

In the pressure-sensitive adhesive layer constituting the optical layered body of the present invention, the crosslinking agent may be, for example, 0.01 to 10 parts by mass with respect to 100 parts by mass of the acrylic resin (P). When the amount of the crosslinking agent is within the above range, the durability of the pressure-sensitive adhesive layer tends to be improved, and white spots on the liquid crystal display panel tend to be inconspicuous.

In the present invention, the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer preferably contains a silane-based compound, and in particular, the acrylic resin before the crosslinking agent is mixed preferably contains a silane-based compound. Since the silane-based compound improves the adhesive strength to glass, high adhesive strength to the display panel can be ensured by including the silane-based compound.

Examples of the silane compound include vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (2-methoxyethoxy) silane, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane, N- (2-amino Ethyl) -3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 2- (3,4-epoxycyclohexyl) ethyl Trimethoxysilane, 3-chloropropylmethyldimethoxysilane, 3-chloropropyltrimethoxysilane, 3-methacryloyloxypropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-glycidoxypropyltrimethoxy Run, 3-glycidoxypropyl triethoxysilane, 3-glycidoxypropyl dimethoxymethyl silane, such as 3-glycidoxypropyl ethoxy dimethyl silane. These silane compounds may be used alone or in combination of two or more.

The silane compound may be of a silicone oligomer type. When the silicone oligomer is shown in the form of (monomer)-(monomer) copolymer, for example, the following can be mentioned.
3-mercaptopropyltrimethoxysilane-tetramethoxysilane copolymer, 3-mercaptopropyltrimethoxysilane-tetraethoxysilane copolymer, 3-mercaptopropyltriethoxysilane-tetramethoxysilane copolymer, and 3-mercaptopropyltriethoxysilane-tetraethoxy A copolymer containing mercaptopropyl groups, such as of a silane copolymer;
Mercaptomethyl, such as mercaptomethyltrimethoxysilane-tetramethoxysilane copolymer, mercaptomethyltrimethoxysilane-tetraethoxysilane copolymer, mercaptomethyltriethoxysilane-tetramethoxysilane copolymer, and mercaptomethyltriethoxysilane-tetraethoxysilane copolymer Group-containing copolymers;
3-methacryloyloxypropyltrimethoxysilane-tetramethoxysilane copolymer, 3-methacryloyloxypropyltrimethoxysilane-tetraethoxysilane copolymer, 3-methacryloyloxypropyltriethoxysilane-tetramethoxysilane copolymer, 3-methacryloyloxypropyltriethoxysilane -Tetraethoxysilane copolymer, 3-methacryloyloxypropylmethyldimethoxysilane-tetramethoxysilane copolymer, 3-methacryloyloxypropylmethyldimethoxysilane-tetraethoxysilane copolymer, 3-methacryloyloxypropylmethyldiethoxysilane-tetramethoxysilane copolymer, and 3-Methacryloyloxypropylmethyldiethoxysilane-tetra Toki such beasts Ranco polymer, methacryloyloxypropyl group containing copolymers;
3-acryloyloxypropyltrimethoxysilane-tetramethoxysilane copolymer, 3-acryloyloxypropyltrimethoxysilane-tetraethoxysilane copolymer, 3-acryloyloxypropyltriethoxysilane-tetramethoxysilane copolymer, 3-acryloyloxypropyltriethoxysilane -Tetraethoxysilane copolymer, 3-acryloyloxypropylmethyldimethoxysilane-tetramethoxysilane copolymer, 3-acryloyloxypropylmethyldimethoxysilane-tetraethoxysilane copolymer, 3-acryloyloxypropylmethyldiethoxysilane-tetramethoxysilane copolymer, and 3-acryloyloxypropylmethyldiethoxysilane-tetraethoxysilane Such as the Rimmer, acryloyloxypropyl group-containing copolymer;
Vinyltrimethoxysilane-tetramethoxysilane copolymer, vinyltrimethoxysilane-tetraethoxysilane copolymer, vinyltriethoxysilane-tetramethoxysilane copolymer, vinyltriethoxysilane-tetraethoxysilane copolymer, vinylmethyldimethoxysilane-tetramethoxysilane copolymer, Vinyl group-containing copolymers such as vinylmethyldimethoxysilane-tetraethoxysilane copolymer, vinylmethyldiethoxysilane-tetramethoxysilane copolymer, and vinylmethyldiethoxysilane-tetraethoxysilane copolymer;
3-aminopropyltrimethoxysilane-tetramethoxysilane copolymer, 3-aminopropyltrimethoxysilane-tetraethoxysilane copolymer, 3-aminopropyltriethoxysilane-tetramethoxysilane copolymer, 3-aminopropyltriethoxysilane-tetraethoxysilane Copolymer, 3-aminopropylmethyldimethoxysilane-tetramethoxysilane copolymer, 3-aminopropylmethyldimethoxysilane-tetraethoxysilane copolymer, 3-aminopropylmethyldiethoxysilane-tetramethoxysilane copolymer, and 3-aminopropylmethyldiethoxy Amino group-containing copolymers, such as silane-tetraethoxysilane copolymers.

These silane compounds are often liquids. The compounding amount of the silane compound in the pressure-sensitive adhesive may be, for example, 0.01 to 10 parts by mass with respect to 100 parts by mass of the acrylic resin (P) (the total amount when two or more types are used). When the amount of the silane compound relative to 100 parts by mass of the acrylic resin (P) is within the above range, the adhesion between the adhesive layer and the substrate (or the liquid crystal cell) is preferably improved. It is preferable because bleeding tends to be suppressed.

The adhesive layer may contain an ionic compound. The ionic compound can function as an antistatic agent. In particular, when the acrylic resin (P) contains the aromatic ring-containing (meth) acrylic compound represented by the formula (IV) and n in the formula (IV) is 2 or more, it is effective for suppressing white spots. In addition, by adding an ionic compound to the pressure-sensitive adhesive containing an acrylic resin copolymerized with this monomer, it is possible to impart good antistatic properties while imparting a whitening suppression effect. The ionic compound here is a compound that exists in a combination of a cation and an anion, and the cation and the anion may be inorganic or organic, respectively, but the acrylic resin (P) and From the viewpoint of compatibility, it is preferable that at least one of the cation and the anion is an ionic compound containing an organic group.

Examples of inorganic cations constituting the ionic compound include alkali metal ions such as lithium cation [Li ⁺ ], sodium cation [Na ⁺ ], potassium cation [K ⁺ ], cesium cation [Cs ⁺ ]; beryllium cation [Be ²⁺ ], magnesium cation [Mg ²⁺ ], calcium cation [Ca ²⁺ ] and other alkaline earth metal ions. Among these, from the viewpoint of metal corrosion resistance, it is preferable to use lithium cation [Li ⁺ ], potassium cation [K ⁺ ] or sodium cation [Na ⁺ ], and from the viewpoint of durability, potassium cation [K ⁺ ] is preferable. More preferably, it is used.

Examples of the organic cation constituting the ionic compound include a pyridinium cation represented by the following formula (V): a quaternary ammonium cation represented by the following formula (VI).

In formula (V), R ₅ to R ₉ each independently represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and R ₁₀ represents an alkyl group having 1 to 16 carbon atoms. In formula (VI), R ₁₁ represents an alkyl group having 1 to 12 carbon atoms, and R ₁₂ , R _13, and R ₁₄ each independently represents an alkyl group having 6 to 12 carbon atoms.

The pyridinium cation represented by the above formula (V) preferably has a total carbon number of 8 or more, particularly 10 or more from the viewpoint of compatibility with the acrylic resin (P). The total number of carbon atoms is preferably 36 or less, more preferably 30 or less. Among the pyridinium-based cations represented by the formula (V), R ₇ bonded to the 4-position carbon atom of the pyridine ring is an alkyl group, and R ₅ , R ₆ , R bonded to other carbon atoms of the pyridine ring. _{One in which 8} and R ₉ are each a hydrogen atom is one of the preferred cations.

Specific examples of the pyridinium cation represented by the formula (V) include N-methyl-4-hexylpyridinium cation, N-butyl-4-methylpyridinium cation, N-butyl-2,4-diethylpyridinium cation, N- Butyl-2-hexylpyridinium cation, N-hexyl-2-butylpyridinium cation, N-hexyl-4-methylpyridinium cation, N-hexyl-4-ethylpyridinium cation, N-hexyl-4-butylpyridinium cation, N- Examples include octyl-4-methylpyridinium cation, N-octyl-4-ethylpyridinium cation, and N-octylpyridinium cation.

The ammonium cation represented by the above formula (VI) preferably has a total carbon number of 20 or more, and more preferably 22 or more from the viewpoint of compatibility with the acrylic resin (P). The total number of carbon atoms is preferably 36 or less, more preferably 30 or less.

Specific examples of the tetraalkylammonium cation represented by the formula (VI) include a tetrahexylammonium cation, a tetraoctylammonium cation, a tributylmethylammonium cation, a trihexylmethylammonium cation, a trioctylmethylammonium cation, a tridecylmethylammonium cation, Examples include trihexylethylammonium cation and trioctylethylammonium cation.

On the other hand, examples of anions constituting an ionic compound include chloride anions [Cl ⁻ ], bromide anions [Br ⁻ ], iodide anions [I ⁻ ], tetrachloroaluminate anions [AlCl ^{4 −} ], heptachlorodi Aluminate anion [Al ₂ Cl ₇ ⁻ ], tetrafluoroborate anion [BF ₄ ⁻ ], hexafluorophosphate anion [PF ₆ ⁻ ], perchlorate anion [ClO ₄ ⁻ ], nitrate anion [NO ₃ ⁻ ], acetate Anion [CH ₃ COO ⁻ ], trifluoroacetate anion [CF ₃ COO ⁻ ], methanesulfonate anion [CH ₃ SO ₃ ⁻ ], trifluoromethanesulfonate anion [CF ₃ SO ₃ ⁻ ], bis (trifluoromethanesulfonyl) i Midanion [(CF ₃ SO ₂ ) ₂ N ⁻ ], Tris (trifluoromethanesulfonyl) methanide anion [(CF ₃ SO ₂ ) ₃ C ⁻ ], hexafluoroarsenate anion [AsF ₆ ⁻ ], hexafluoroantimonate anion [SbF ₆ ⁻ ], hexafluoroniobate anion [NbF ₆ ⁻ ], hexafluorotantalate anion [TaF ₆ ⁻ ], (poly) hydrofluorofluoride anion [F (HF) _n ⁻ ] (n is 1 to 3 Degree), thiocyan anion [SCN ⁻ ], dicyanamide anion [(CN) ₂ N ⁻ ], perfluorobutane sulfonate anion [C ₄ F ₉ SO ₃ ⁻ ], bis (pentafluoroethanesulfonyl) imide anion [(C ₂ F ₅ SO ₂₎ ₂ N ^-], perfluoro Tano benzoate anion _[C 3 _F 7 COO ^-] ^-, and the like, (trifluoromethanesulfonyl) (trifluoromethane carbonyl) imide anion _{_{_{[(CF 3 SO 2) (CF}}} 3 CO) N ].

Specific examples of the ionic compound can be appropriately selected from the combination of the above cation and anion. Specific examples of ionic compounds that are combinations of cations and anions include lithium bis (trifluoromethanesulfonyl) imide, lithium hexafluorophosphate, lithium iodide (lithium iodide), lithium bis (pentafluoroethanesulfonyl) imide, and lithium tris. (Trifluoromethanesulfonyl) methanide, sodium bis (trifluoromethanesulfonyl) imide, sodium bis (pentafluoroethanesulfonyl) imide, sodium tris (trifluoromethanesulfonyl) methanide, potassium bis (trifluoromethanesulfonyl) imide, potassium bis (pentafluoroethane) (Sulfonyl) imide, potassium tris (trifluoromethanesulfonyl) methanide, N-methyl- -Hexylpyridinium bis (trifluoromethanesulfonyl) imide, N-butyl-2-methylpyridinium bis (trifluoromethanesulfonyl) imide, N-hexyl-4-methylpyridinium bis (trifluoromethanesulfonyl) imide, N-octyl-4-methyl Pyridinium bis (trifluoromethanesulfonyl) imide, N-methyl-4-hexylpyridinium hexafluorophosphate, N-butyl-2-methylpyridinium hexafluorophosphate, N-hexyl-4-methylpyridinium hexafluorophosphate, N-octyl-4 -Methylpyridinium hexafluorophosphate, N-methyl-4-hexylpyridinium perchlorate, N-butyl-2-methylpyridinium par Chlorate, N-hexyl-4-methylpyridinium perchlorate, N-octyl-4-methylpyridinium perchlorate, tetrahexylammonium bis (trifluoromethanesulfonyl) imide, tributylmethylammonium bis (trifluoromethanesulfonyl) imide, trihexylmethylammonium Bis (trifluoromethanesulfonyl) imide, trioctylmethylammonium bis (trifluoromethanesulfonyl) imide, tetrahexylammonium hexafluorophosphate, tributylmethylammonium hexafluorophosphate, trihexylmethylammonium hexafluorophosphate, trioctylmethylammonium hexafluorophosphate, Tetrahexyl Ammonium perchlorate, tributyl ammonium perchlorate, tri-hexyl ammonium perchlorate, trioctylmethylammonium perchlorate and the like.

These ionic compounds can be used alone or in combination of two or more. When the ionic compound is contained, the amount thereof may be, for example, 0.1 to 10 parts by mass with respect to 100 parts by mass of the acrylic resin (P).

In the present invention, the adhesive layer may further contain a crosslinking catalyst, a weather resistance stabilizer, a tackifier, a plasticizer, a softener, a dye, a pigment, an inorganic filler, a resin other than an acrylic resin, and the like. It is also useful to form a harder adhesive layer by blending an ultraviolet curable compound such as a polyfunctional acrylate and a photoinitiator into the adhesive, and irradiating and curing the ultraviolet ray after forming the adhesive layer. This embodies the second cross-linked structure in the pressure-sensitive adhesive, and plays a role of improving durability during a heat test. Moreover, if a crosslinking catalyst is used together with a crosslinking agent in the pressure-sensitive adhesive, the pressure-sensitive adhesive layer can be prepared by aging in a short time. In the resulting optical laminate, the pressure-sensitive adhesive layer and the first cured product layer or the first protective film It is possible to suppress the occurrence of floating or peeling between the layers or foaming in the adhesive layer, and the reworkability may be improved.

Examples of the crosslinking catalyst include amine compounds such as hexamethylenediamine, ethylenediamine, polyethyleneimine, hexamethylenetetramine, diethylenetriamine, triethylenetetramine, isophoronediamine, trimethylenediamine, polyamino resin, and melamine resin. . When an amine compound is added to the adhesive as a crosslinking catalyst, an isocyanate compound is suitable as the crosslinking agent.

Furthermore, it can also be a pressure-sensitive adhesive layer containing light particles by containing fine particles. The adhesive layer may contain an antioxidant, an ultraviolet absorber and the like. Examples of ultraviolet absorbers include salicylic acid ester compounds, benzophenone compounds, benzotriazole compounds, cyanoacrylate compounds, and nickel complex compounds.

The pressure-sensitive adhesive layer is provided by, for example, applying the above-mentioned pressure-sensitive adhesive as an organic solvent solution, applying it on a film or layer (for example, a polarizing film, etc.) to be laminated with a die coater or a gravure coater, and drying. Can do. Moreover, it can also provide by the method of transcribe | transferring the sheet-like adhesive formed on the plastic film (it is called a separate film) to which the mold release process was given to the film or layer which is going to laminate | stack. The thickness of the adhesive layer is not particularly limited, but is preferably in the range of 2 to 40 μm, more preferably in the range of 5 to 35 μm, and still more preferably in the range of 10 to 30 μm. .

The adhesive layer preferably has a storage elastic modulus of 0.10 to 5.0 MPa at 23 to 80 ° C., more preferably 0.15 to 1.0 MPa. It is preferable that the storage elastic modulus at 23 to 80 ° C. is 0.10 MPa or more because white spots due to shrinkage of the optical laminate when the liquid crystal display panel including the optical laminate is exposed to a high temperature can be suppressed. Moreover, since it is hard to produce the fall of durability by the fall of adhesive force as it is 5 Mpa or less, it is preferable. Here, “showing a storage elastic modulus of 0.10 to 5.0 MPa at 23 to 80 ° C.” means that the storage elastic modulus takes a value within the above range at any temperature within this range. Since the storage elastic modulus usually decreases gradually as the temperature rises, if both the storage elastic modulus at 23 ° C. and 80 ° C. are within the above range, the adhesive layer has a storage elastic modulus within the above range at this temperature range. Can be seen. The storage elastic modulus of the adhesive layer can be measured with a commercially available viscoelasticity measuring device, for example, a viscoelasticity measuring device “DYNAMIC ANALYZER RDA II” manufactured by REOMETRIC.

[Conductive layer]
The conductive layer included in the optical layered body of the present invention may be, for example, a conductive transparent metal oxide layer or a metal wiring layer. Such a conductive layer is, for example, aluminum, copper, silver, iron, tin, zinc, platinum, nickel, molybdenum, chromium, tungsten, lead, titanium, palladium, indium, and an alloy containing two or more of these metals. It may be a layer containing at least one metal element selected from: Among these, the conductive layer may be a layer containing at least one metal element selected from aluminum, copper, silver and gold from the viewpoint of conductivity, and from the viewpoint of conductivity and cost, More preferably, it may be a layer containing an aluminum element. In the case of a layer containing copper, blackening treatment may be performed from the viewpoint of preventing light reflection. The blackening treatment is to oxidize the surface of the conductive layer to precipitate Cu ₂ O or CuO. The conductive layer may be a layer containing, for example, metallic silver, ITO (tin-doped indium oxide), graphene, zinc oxide, or AZO (aluminum-doped zinc oxide).

The conductive layer (conductive layer 4 in FIGS. 1 and 2) is provided, for example, on a substrate (substrate X in FIGS. 1 and 2). Examples of the method for forming the conductive layer on the substrate include a sputtering method. The substrate may be a transparent substrate constituting a liquid crystal cell included in the touch input element, or may be a glass substrate. The transparent substrate may be formed of, for example, polyethylene terephthalate, polycarbonate, polymethyl methacrylate, polyethylene naphthalate, polyether sulfone, cyclic olefin copolymer, triacetyl cellulose, polyvinyl alcohol, polyimide, polystyrene, biaxially stretched polystyrene, or the like. The glass substrate may be formed of, for example, soda lime glass, low alkali glass, non-alkali glass, or the like. The conductive layer may be formed on the entire surface of the substrate or may be formed on a part thereof.

Examples of the conductive transparent metal oxide layer include transparent electrode layers such as ITO (tin-doped indium oxide) and AZO (aluminum-doped zinc oxide).

Examples of the metal wiring layer include a metal mesh that is a thin metal wiring layer, metal nanoparticles, and a layer in which metal nanowires are added in a binder. The metal mesh indicates a two-dimensional network structure formed of metal wiring. The shape of the opening of the metal mesh (opening between wirings or mesh) is not particularly limited, and may be, for example, a polygon (triangle, square, pentagon, hexagon, etc.), circle, ellipse, or indefinite shape. Each opening may be the same or different. In a preferred embodiment, the openings of the metal mesh have the same shape and are square or rectangular.

When the conductive layer is a metal wiring layer (particularly a metal mesh), for example, the metal wiring may be arranged with a predetermined interval in the vertical and horizontal directions of the plane on the substrate X. At this time, the opening may be filled with a resin (adhesive or the like), or a metal wiring layer may be embedded in the resin (adhesive or the like). In addition, when using resin etc., the conductive layer (conductive layer 4) is comprised with both metal wiring and resin (adhesive).

The line width of the metal wiring (particularly metal mesh) is usually 10 μm or less, preferably 5 μm or less, more preferably 3 μm or less, usually 0.1 μm or more, preferably 0.5 μm or more, more preferably 1 μm or more. The line width of the metal wiring layer may be a combination of these upper and lower limits, and is preferably 0.5 to 5 μm, more preferably 1 to 3 μm.

The thickness of the conductive layer (conductive transparent metal oxide layer or metal wiring layer) is not particularly limited, but is usually 10 μm or less, preferably 3 μm or less, more preferably 1 μm or less, particularly preferably 0.5 μm or less, Usually, it is 0.01 μm or more, preferably 0.05 μm or more, more preferably 0.1 μm or more. The thickness of the conductive layer may be a combination of these upper and lower limits, and is preferably 0.01 to 3 μm, more preferably 0.05 to 1 μm. When the conductive layer is a metal wiring layer and the metal wiring layer is composed of both a resin (such as an adhesive) and a metal wiring, the thickness of the conductive layer is a thickness including the resin.

The method for preparing the conductive layer is not particularly limited, and may be lamination of metal foil. Vacuum deposition method, sputtering method, wet coating, ion plating method, ink jet printing method, gravure printing method, electrolytic plating, electroless plating However, it is preferably a conductive layer formed by a sputtering method, an ink jet printing method, or a gravure printing method, and more preferably a conductive layer formed by sputtering.

The conductive layer (for example, metal mesh) may have a function of generating a signal when touching a transparent substrate in a touch panel, for example, and transmitting touch coordinates to an integrated circuit or the like.

In the optical laminate of the present invention, the laminate in which the first cured product layer and the adhesive layer are laminated in this order on one surface of the polarizing film is bonded to a conductive layer formed on a substrate (or Can be obtained).

An optical laminate including a conductive layer (for example, a conductive transparent metal oxide layer or a metal wiring layer) is useful because it can be used for a touch input type liquid crystal display device having a touch panel function, but a polarizing film. The dichroic dye (iodine) contained in is moved to the conductive layer and the conductive layer is easily corroded. In particular, when a metal wiring layer such as a metal mesh is used, the conductive layer is more easily corroded because the line width is narrow. However, since the optical layered body of the present invention includes the first cured product layer, the movement of the dichroic dye to the conductive layer can be effectively suppressed, and corrosion of the conductive layer can be effectively prevented.

[Polarized film]
The polarizing film constituting the optical laminate of the present invention is a film having a function of extracting linearly polarized light from incident natural light. In the present invention, the polyvinyl alcohol resin film contains a dichroic dye, preferably iodine. It is a film that is adsorbed and oriented. As the polyvinyl alcohol resin constituting the polyvinyl alcohol resin film, a saponified polyvinyl acetate resin can be used. Polyvinyl acetate resins include polyvinyl acetate, which is a homopolymer of vinyl acetate, and copolymers of vinyl acetate and other monomers copolymerizable therewith (for example, ethylene-vinyl acetate copolymer). And the like. Examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and acrylamides having an ammonium group.

The saponification degree of the polyvinyl alcohol resin is usually 85 to 100 mol%, preferably 98 mol% or more. The polyvinyl alcohol-based resin may be modified. For example, polyvinyl formal modified with aldehydes, polyvinyl acetal, polyvinyl butyral, and the like can be used. The degree of polymerization of the polyvinyl alcohol-based resin is usually 1000 to 10000, and preferably 1500 to 5000.

A film obtained by forming such a polyvinyl alcohol-based resin can be used as an original film of a polarizing film. The method for forming a polyvinyl alcohol-based resin is not particularly limited, and can be formed by a conventionally known method. The film thickness of the raw film made of polyvinyl alcohol resin is not particularly limited, but considering easiness of stretching, it is, for example, 10 to 150 μm, preferably 15 to 100 μm, more preferably Is 20 to 80 μm.

The polarizing film is usually a step of uniaxially stretching such a polyvinyl alcohol resin film, a step of adsorbing a dichroic dye by dyeing the polyvinyl alcohol resin film with a dichroic dye, and a dichroic dye It is manufactured through a process of treating the adsorbed polyvinyl alcohol-based resin film with a boric acid aqueous solution and a step of washing with water after the treatment with the boric acid aqueous solution.

The uniaxial stretching of the polyvinyl alcohol-based resin film may be performed before the dichroic dye is dyed, may be performed simultaneously with the dyeing, or may be performed after the dyeing. When uniaxial stretching is performed after dyeing, the uniaxial stretching may be performed before boric acid treatment or during boric acid treatment. It is also possible to perform uniaxial stretching in these plural stages. In uniaxial stretching, it may be uniaxially stretched between rolls having different peripheral speeds, or may be uniaxially stretched using a hot roll. The uniaxial stretching may be dry stretching in which stretching is performed in the atmosphere, or may be wet stretching in which stretching is performed in a state where a solvent is used and the polyvinyl alcohol-based resin film is swollen. From the viewpoint of suppressing deformation of the polarizing film, the draw ratio is preferably 8 times or less, more preferably 7.5 times or less, and even more preferably 7 times or less. Moreover, it is preferable that a draw ratio is 4.5 times or more from a viewpoint of expressing the function as a polarizing film.

In the present invention, a method of immersing and dyeing a polyvinyl alcohol resin film in an aqueous solution containing iodine and potassium iodide is usually employed. The content of iodine in the aqueous solution is usually 0.01 to 1 part by mass per 100 parts by mass of water, and the content of potassium iodide is usually 0.5 to 20 parts by mass per 100 parts by mass of water. . The temperature of the aqueous solution used for dyeing is usually 20 to 40 ° C., and the immersion time (dyeing time) in this aqueous solution is usually 20 to 1800 seconds.

The boric acid treatment after dyeing with iodine can be performed by immersing the dyed polyvinyl alcohol-based resin film in a boric acid-containing aqueous solution. The amount of boric acid in the boric acid-containing aqueous solution is usually 2 to 15 parts by mass, preferably 5 to 12 parts by mass per 100 parts by mass of water. In the present invention, this boric acid-containing aqueous solution preferably contains potassium iodide. The amount of potassium iodide in the boric acid-containing aqueous solution is usually 0.1 to 15 parts by mass, preferably 5 to 12 parts by mass, per 100 parts by mass of water. The immersion time in the boric acid-containing aqueous solution is usually 60 to 1200 seconds, preferably 150 to 600 seconds, and more preferably 200 to 400 seconds. The temperature of the boric acid-containing aqueous solution is usually 50 ° C. or higher, preferably 50 to 85 ° C., more preferably 60 to 80 ° C.

The polyvinyl alcohol resin film after the boric acid treatment is usually washed with water. The water washing treatment can be performed, for example, by immersing a boric acid-treated polyvinyl alcohol resin film in water. The temperature of water in the water washing treatment is usually 5 to 40 ° C., and the immersion time is usually 1 to 120 seconds. After washing with water, a drying process is performed to obtain a polarizing film. The drying treatment can be performed using a hot air dryer or a far infrared heater. The temperature for the drying treatment is usually 30 to 100 ° C., preferably 40 to 95 ° C., more preferably 50 to 90 ° C. The drying treatment time is usually 60 to 600 seconds, preferably 120 to 600 seconds.

Thus, the polyvinyl alcohol-based resin film is uniaxially stretched, dyed with a dichroic dye, preferably iodine, and treated with boric acid to obtain a polarizing film. The thickness of the polarizing film can be 5 to 40 μm, for example.

[Second cured product layer]
The optical laminated body of this invention may be equipped with the 2nd hardened | cured material layer comprised from the hardened | cured material of a curable composition in the surface on the opposite side to the said 1st hardened | cured material layer of a polarizing film. The curable composition which comprises a 2nd hardened | cured material layer can be suitably selected according to adhesiveness with a polarizing film or a 2nd protective film, and is contained in the range of the curable composition which comprises the above-mentioned 1st hardened | cured material layer. The composition may be a photocurable adhesive or the like known in the art. When using the composition contained in the range of the curable composition which comprises the above-mentioned 1st hardened | cured material layer, the curable composition of the same composition as the curable composition of the 1st hardened | cured material layer which comprises an optical laminated body is used. You may use for a 2nd hardened | cured material layer, and you may use a curable composition of a different composition for a 2nd hardened | cured material layer.

Examples of the photocurable adhesive known in the art include a mixture of a photocurable epoxy resin and a photocationic polymerization initiator, and a mixture of a photocurable acrylic resin and a photoradical polymerization initiator. A curable composition for forming a cured product constituting the second cured product layer is, for example, a photocurable adhesive containing a photocurable component and a cationic photopolymerization initiator described in International Publication No. 2014/129368. Can be used.

The second cured product layer is applied by applying a curable composition constituting the second cured product layer to the surface opposite to the surface on which the first cured product layer of the optical laminate is laminated, and cured. Can be formed. Examples of the coating method of the curable composition constituting the second cured product layer include the same coating method as that of the curable composition (1).

When a photocurable composition or a known photocurable adhesive is used as the curable composition constituting the second cured product layer, the curable composition or the curable adhesive is irradiated by irradiating active energy rays. Is cured. The light source of the active energy ray is not particularly limited, but an active energy ray having a light emission distribution at a wavelength of 400 nm or less is preferable, and specifically, a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, an ultrahigh pressure mercury lamp, a chemical lamp, a black light lamp A microwave excitation mercury lamp, a metal halide lamp and the like are preferable.

The light irradiation intensity to the curable composition constituting the second cured product layer can be appropriately selected depending on the composition of the curable composition and is not particularly limited, but the irradiation intensity in the wavelength region effective for activating the polymerization initiator. Is preferably 0.1 to 1000 mW / cm ² . The light irradiation time to the curable composition constituting the second cured product layer may be appropriately selected depending on the curable composition to be cured, and the integrated light amount expressed as the product of the irradiation intensity and the irradiation time is preferably It is set to be 10 to 5000 mJ / cm ² .

In the case of curing the curable composition by irradiation with active energy rays, for example, the degree of polarization of the polarizing film, the transmittance and the hue, and the transparency of various films constituting the protective film and the optical layer, for example, It is preferable to perform the curing under conditions that do not deteriorate the various functions. The thickness of the second cured product layer is not particularly limited, but is usually 0.1 to 10 μm.

〔Protective film〕
In one embodiment, the optical laminate of the present invention has a first protective film (7 shown in FIG. 2) laminated on one surface of the polarizing film via a first cured product layer. In one embodiment, the optical laminate of the present invention is laminated on the other surface of the polarizing film (the surface opposite to the first cured product layer 2) via the second cured product layer. It has a second protective film (6 shown in FIGS. 1 and 2). From the viewpoint of contributing to prevention of shrinkage and expansion of the polarizing film, prevention of deterioration of the polarizing film due to temperature, humidity, ultraviolet rays, and the like, in one embodiment, the optical laminate of the present invention has the first protective film. On the other hand, from the viewpoint of reducing the thickness of the optical laminate, in one embodiment, the optical laminate of the present invention does not include the first protective film. Since the 1st hardened material layer in this invention replaces with a protective film and contributes also to prevention of deterioration of a polarizing film, from a viewpoint of achieving the prevention of deterioration of a polarizing film and thinning of an optical laminated body with sufficient balance, it is optical of this invention. It is preferable that a laminated body does not contain a 1st protective film.

As a material for forming the protective film, a material excellent in transparency, mechanical strength, thermal stability, moisture shielding property, isotropy and the like is preferable. For example, polyester polymers such as polyethylene terephthalate and polyethylene naphthalate; cellulose polymers such as diacetyl cellulose and triacetyl cellulose; acrylic polymers such as polymethyl methacrylate; styrene such as polystyrene and acrylonitrile / styrene copolymer (AS resin) Type polymer; polycarbonate type polymer. In addition, polyethylene, polypropylene, polyolefin having a cyclo or norbornene structure; polyolefin polymer such as ethylene / propylene copolymer; vinyl chloride polymer, amide polymer such as nylon or aromatic polyamide; imide polymer, sulfone Polymer, polyether sulfone polymer, polyether ether ketone polymer, polyphenylene sulfide polymer, vinyl alcohol polymer, vinylidene chloride polymer, vinyl butyral polymer, arylate polymer, polyoxymethylene polymer, epoxy polymer, or Examples of the polymer that forms the protective film include blends of the above polymers. The protective film can also be formed as a cured product layer of thermosetting or ultraviolet curable resin such as acrylic, urethane, acrylurethane, epoxy, or silicone. Among them, those having a hydroxyl group having reactivity with an isocyanate crosslinking agent are preferable, and cellulose polymers are particularly preferable.
In the optical laminate of the present invention, the first protective film and the second protective film may be composed of the same material or may be composed of different materials.

The moisture permeability of the second protective film is preferably 1200 g / (m ² · 24 hours) or less, more preferably 800 g / (m ² · 24 hours) or less at a temperature of 23 ° C. and a relative humidity of 55%. More preferably, it is 600 g / (m ² · 24 hours) or less, particularly preferably 400 g / (m ² · 24 hours) or less, and most preferably 200 g / (m ² · 24 hours) or less. When the moisture permeability of the second protective film is equal to or lower than the above value, entry of moisture from the outside under high temperature and high humidity is prevented, and acceleration of movement of the dichroic dye (iodine) contained in the polarizing film is prevented. Therefore, corrosion of the conductive layer and deterioration of optical properties can be more effectively prevented. On the other hand, since the optical layered body of the present invention has the first cured product layer, even if the second protective film does not satisfy the above moisture permeability, the movement of the dichroic dye (iodine) contained in the polarizing film is suppressed, It is possible to prevent deterioration of the conductive layer and optical characteristics.

The thickness of the protective film is not particularly limited, but both the first protective film and the second protective film are usually 5 to 500 μm, preferably 1 to 300 μm, more preferably 5 to 200 μm, still more preferably 10 to 100 μm. Moreover, the protective film may be comprised from the protective film etc. which added the optical compensation function.

In the optical layered body of the present invention, the first cured product layer can effectively suppress the movement of the dichroic dye from the polarizing film to the adhesive layer and the movement of the ionic compound from the adhesive layer to the polarizing film. Therefore, the selection range about the material of the 1st protective film which comprises an optical laminated body spreads. That is, it is not necessary to use a protective film that hardly transmits an ionic compound, and an optical laminate can be formed using a protective film that is generally inexpensive and easily transmits an ionic compound. The optical layered body of the present invention is advantageous from an industrial point of view, such as reducing the production cost.

In the optical laminate of the present invention shown in FIGS. 1 and 2, the first cured product layer is directly laminated on the polarizing film, but the first cured product is provided between the polarizing film and the first cured product layer. A primer layer may be provided between the layer and the pressure-sensitive adhesive layer. Examples of the material for forming the primer layer include various polymers such as urethane oligomers, metal oxide sols, silica sols, and the like. The primer layer is thinner than the protective film, for example, 0.01 to 3 μm, preferably 0.1 to 2 μm, more preferably 0.5 to 1 μm.

Moreover, the optical layered body of the present invention may include a protective film via an adhesive layer between the polarizing film and the first cured product layer. As a protective film, the protective film similar to the 1st protective film or the 2nd protective film illustrated above is mentioned, for example. The thickness of the protective film is usually 5 to 500 μm as in the case of the first protective film or the second protective film.

The optical layered body of the present invention can effectively prevent the movement of the dichroic dye even if the first cured product layer is not provided with a protective film between the polarizing film and the first cured product layer. For this reason, in the optical laminate of the present invention, the first cured product layer is laminated directly on the polarizing film, or the first cured product layer is laminated on the polarizing film via the primer layer, or the first A mode in which an adhesive layer is laminated on one cured product layer via a primer layer is preferred.

The optical layered body of the present invention may further include an optical layer such as a retardation film, a viewing angle compensation film, and a brightness enhancement film, if necessary. In the optical layered body of the present invention, the optical layer can be formed using a material known in the art.

The optical laminate of the present invention can be produced by a known method. For example, a curable composition is apply | coated to a 2nd protective film, a 2nd cured composition layer is formed, a polarizing film is bonded to the said 2nd cured composition layer, and a laminated body is produced. In the case of an optical laminate that does not include the first protective film, the curable composition (1) is applied on the peelable film to form the first cured composition layer, and the polarizing film side of the laminate on the coated surface Paste. Next, active energy rays such as ultraviolet rays and electron beams are irradiated to cure the second cured composition layer and the first cured composition layer to form the second cured product layer and the first cured product layer. Thereafter, the peelable film is peeled off to form an adhesive layer on the first cured product layer. And what is necessary is just to bond an adhesive layer to the conductive layer laminated | stacked on the board | substrate, for example. On the other hand, in the case of an optical laminate including a first protective film, the curable composition (1) is applied on the protective film to form a first cured composition layer, and the polarizing film side of the laminate is applied to the coated surface. After bonding, the first cured composition layer is formed by irradiating active energy rays such as ultraviolet rays and electron beams to form a first cured product layer, and then an adhesive layer is formed on the first protective film. To do. And what is necessary is just to bond an adhesive layer to the conductive layer laminated | stacked on the board | substrate, for example.

From the viewpoint of reducing thickness unevenness when the curable composition is applied and making the optical laminate thin, it is possible to form a laminate using a separate film (release film) as described above. it can. For example, a laminate composed of a polarizing film and a first cured product layer is obtained by laminating a separate film (peeling film) on one surface of the polarizing film via a first cured product layer, and first curing with active energy rays or the like. It can form by peeling a separate film (peeling film), after hardening a physical layer.

The present invention comprises an optical laminate having the above-described configuration, that is, a cured product of a curable composition containing a polymerizable compound on one surface of a polarizing film containing a dichroic dye in a polyvinyl alcohol-based resin. An optical laminate (optical laminate shown in FIGS. 1 and 2 in one embodiment) in which a first cured product layer, an adhesive layer, and a conductive layer are laminated in this order,
The polymerizable compound includes an oxetane compound having two or more oxetanyl groups, and the content of the oxetane compound is 40 parts by mass or more with respect to 100 parts by mass of the total amount of all polymerizable compounds contained in the curable composition. An optical laminate. When a predetermined amount or more of an oxetane compound having two or more oxetanyl groups is included, a dense first cured product layer having a high crosslinking density can be formed. Therefore, a first cured product of a dichroic dye (iodine) contained in a polarizing film The movement to the layer can be effectively suppressed, and the corrosion of the conductive layer and the deterioration of the optical performance due to the dichroic dye (iodine) can be effectively prevented. In addition, about such an optical laminated body, the rate of increase in absorbance of the first cured product layer may or may not be 30% or less. In a preferred embodiment, the oxetane compound having two or more oxetanyl groups is the above-mentioned oxetane compound (A), and the components and contents contained in the curable composition forming the cured product of the first cured product layer ( Preferred components and contents are also included). In addition, the polarizing film, the adhesive layer, and the conductive layer included in the optical laminate are the same as those described above.

In this invention, the 1st hardened | cured material layer comprised from the hardened | cured material of the curable composition containing a polymeric compound on one surface of the polarizing film containing a dichroic dye in polyvinyl alcohol-type resin, and an adhesion layer And an optical laminate in which the conductive layer is laminated in this order, and the optical laminate having a water contact angle of the first cured product layer of 90 ° or more is caused by the excellent hydrophobicity of the first cured product layer. Even in high-temperature and high-humidity environments where the movement of dichroic dye (iodine) becomes significant, it effectively suppresses the movement of dichroic dye and effectively prevents corrosion of the conductive layer and degradation of optical performance. can do.

In the present invention, the water contact angle of the first cured product layer is, for example, 90 ° or more, preferably 95 ° or more, more preferably 100 ° or more. When the water contact angle is equal to or greater than the above value, the migration of the dichroic dye to the first cured product layer is effectively suppressed even under high temperature and high humidity, and the conductive layer is effectively corroded and the optical performance is reduced. Can be prevented.

In this invention, the 1st hardened | cured material layer comprised from the hardened | cured material of the curable composition containing a polymeric compound on one surface of the polarizing film containing a dichroic dye in polyvinyl alcohol-type resin, and an adhesion layer And an optical laminate in which a conductive layer is laminated in this order, and the optical laminate having a storage elastic modulus at 30 ° C. of the first cured product layer of 1500 MPa or more is caused by a relatively high crosslinking density. In addition, the barrier property against dichroic dye (iodine) is high, and the migration of the dichroic dye (iodine) to the first cured product layer is effectively suppressed, and the corrosion of the conductive layer and the optical performance are effectively reduced. Can be prevented.

The storage elastic modulus at 30 ° C. of the first cured product layer is, for example, 1500 to 3500 MPa, preferably 1800 to 3500 MPa, more preferably 2000 to 3500 MPa, and further preferably 2500 to 3500 MPa. When the elastic modulus is equal to or higher than the lower limit, the movement of the dichroic dye (iodine) to the first cured product layer is more effectively suppressed, and the corrosion of the conductive layer and the deterioration of the optical performance are more effectively prevented. be able to.

In this invention, the 1st hardened | cured material layer comprised from the hardened | cured material of the curable composition (1) containing a polymeric compound on one surface of the polarizing film containing a dichroic dye in a polyvinyl alcohol-type resin, The optical laminate in which the adhesive layer and the conductive layer are laminated in this order, and the optical laminate having the glass transition temperature of the first cured product layer of 90 ° C. or higher is due to the relatively high crosslinking density. In addition, the barrier property against the dichroic dye (iodine) is high, and the migration of the dichroic dye (iodine) to the first cured product layer is effectively suppressed, and the corrosion of the conductive layer and the optical performance are effectively reduced. Can be prevented.

The glass transition temperature of the first cured product layer is, for example, 90 to 180 ° C., preferably 100 to 180 ° C., more preferably 120 to 180 ° C., and further preferably 150 to 180 ° C. When the elastic modulus is equal to or higher than the lower limit, the movement of the dichroic dye (iodine) to the first cured product layer is more effectively suppressed, and the corrosion of the conductive layer and the deterioration of the optical performance are more effectively prevented. be able to.

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. In the examples and comparative examples, “%” and “parts” represent “% by mass” and “parts by mass”, respectively, unless otherwise specified.

[Example 1]
1. Preparation of curable composition (I) constituting first cured product layer According to the composition shown in Table 1 below, each component was mixed to prepare curable compositions (I) of Production Examples 1 to 31.

2. Evaluation of absorbance increase rate of first cured product layer (Iodine ion absorptivity evaluation)
On one side of a 50 μm thick cycloolefin film [trade name “ZEONOR” manufactured by Nippon Zeon Co., Ltd.], the curable composition (I) of Production Example 1 is cured using a bar coater. The coating was performed to have a thickness of about 30 μm. A 50 μm-thick cycloolefin film [trade name “ZEONOR”, manufactured by Nippon Zeon Co., Ltd.] was bonded to the coated surface to prepare a laminate. From the cycloolefin film side of the laminate, the integrated light quantity from 280 nm to 320 nm is 1000 mJ / cm ² using an ultraviolet irradiation device with a belt conveyor (the lamp uses “D bulb” manufactured by Fusion UV Systems). Were irradiated with ultraviolet rays to cure the curable composition (I) to obtain a laminate in which cycloolefin films were laminated on both sides of the first cured product layer. The cycloolefin film on both sides of the obtained laminate was peeled off, and the cured product (first cured product layer) of the curable composition (I) was isolated and used as an evaluation sample.
The absorbance at 360 nm was measured for the evaluation sample using an ultraviolet-visible spectrophotometer (manufactured by Shimadzu Corporation, “UV2450”). This absorbance is defined as absorbance before immersion.
Next, the sample for evaluation was immersed in an aqueous solution of 50% potassium iodide for 100 hours in an atmosphere having a temperature of 23 ° C. and a relative humidity of 60%. After taking out the sample for evaluation and wiping the surface with pure water, the absorbance at 360 nm was measured using an ultraviolet-visible spectrophotometer (“UV2450” manufactured by Shimadzu Corporation). This absorbance is defined as absorbance after immersion.
Using the obtained absorbance, the absorbance increase rate (%) represented by the following formula was calculated. The results are shown in Table 1. Similarly, the rate of increase in absorbance of each cured layer formed from the curable compositions (I) of Production Examples 2 to 31 was determined. The results are shown in Table 1.
Absorbance increase rate (%) = (absorbance after immersion (360 nm) −absorbance before immersion (360 nm)) / absorbance before immersion (360 nm) × 100 (1)

Each component in Table 1 is shown below.
<Alicyclic epoxy compound (B2)>
B2-1: 3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexanecarboxylate (“Celoxide 2021P” (trade name), manufactured by Daicel Chemical Industries, Ltd.) B2-2: 2,2-bis (hydroxymethyl)- 1,2-Epoxy-4- (2-oxiranyl) cyclohexane adduct of 1-butanol (“EHPE3150” (trade name), manufactured by Daicel Chemical Industries, Ltd.)
<Aliphatic epoxy compound (B1)>
B1-1: 1,4-butanediol diglycidyl ether ("EX-214" (trade name), manufactured by Nagase ChemteX Corporation)
B1-2: Cyclohexanedimethanol diglycidyl ether (“EX-216” (trade name), manufactured by Nagase ChemteX Corporation)
B1-3: Cyclohexanedimethanol diglycidyl ether (“EX-411” (trade name), manufactured by Nagase ChemteX Corporation)
<Aromatic epoxy compound (B3)>
B3-1: Resorcinol diglycidyl ether ("EX-201" (trade name), manufactured by Nagase ChemteX Corporation)
B3-2: Bis A type epoxy resin ("jER828EL" (trade name), manufactured by Mitsubishi Chemical Corporation)
B3-3: 2- [4- (2,3-epoxypropoxy) phenyl] -2- [4- [1,1-bis [4-([2,3-epoxypropoxy] phenyl] ethyl] phenyl] propane ("TECHMORE VG3101L" (trade name), manufactured by Printec Co., Ltd.)
<Oxetane compound (A)>
A1-1: Bis (3-ethyl-3-oxetanylmethyl) ether (“OXT-221” (trade name), manufactured by Toagosei Co., Ltd.)
A1-2: Xylylenebisoxetane ("OXT-121" (trade name), manufactured by Toagosei Co., Ltd.)
<Oxetane compound (a)>
a1-1: 2-Ethylhexyloxetane (“OXT-212” (trade name), manufactured by Toagosei Co., Ltd., compound having one oxetanyl group)
a1-2: 3-ethyl-3-hydroxymethyloxetane (“OXT-101” (trade name), manufactured by Toagosei Co., Ltd., compound having one oxetanyl group)
<Acrylic compound>
P1-1: Tricyclodecane dimethanol diacrylate (“A-DCP” (trade name), manufactured by Shin-Nakamura Chemical Co., Ltd.)
P1-2: Diacrylate of acetal compound of hydroxypivalaldehyde and trimethylolpropane (“A-DOG (trade name)”, manufactured by Shin-Nakamura Chemical Co., Ltd.)
<Polymerization initiator>
G1-1: Photocationic polymerization initiator: propylene carbonate 50 solution of triarylsulfonium hexafluorophosphate (“CPI-100P” (trade name), manufactured by San Apro Co., Ltd.)
G1-2: Photoradical polymerization initiator: 2-hydroxy-2-methyl-1-phenyl-propan-1-one ("Darocur 1173" (trade name), manufactured by BASF Japan Ltd.)
<Leveling agent>
S1-1: Silicone leveling agent ("SH710" (trade name), manufactured by Toray Dow Corning Co., Ltd.)

3. Production of Polarizing Film Polyvinyl alcohol film having a thickness of 20 μm (manufactured by Kuraray Co., Ltd., “Kuraray Poval KL318” (trade name): carboxyl group-modified polyvinyl alcohol, average polymerization degree of about 2,400, saponification degree of 99.9 mol% The above is uniaxially stretched about 5 times by dry stretching, and further immersed in pure water at 60 ° C. for 1 minute while maintaining the tension state, the mass ratio of iodine / potassium iodide / water is 0.05 / It was immersed in a 5/100 aqueous solution at 28 ° C. for 60 seconds. Then, it was immersed in an aqueous solution having a mass ratio of potassium iodide / boric acid / water of 8.5 / 8.5 / 100 at 72 ° C. for 300 seconds. Further, after washing with pure water at 26 ° C. for 20 seconds and drying at 65 ° C., a polarizing film (1) having a thickness of 7 μm in which iodine was adsorbed and oriented on a polyvinyl alcohol film was obtained.

4). Preparation of water-based adhesive 100 parts by mass pure, polyvinyl alcohol film (manufactured by Kuraray Co., Ltd., “Kuraray Poval KL318” (trade name): carboxyl group-modified polyvinyl alcohol), and water-soluble polyamide epoxy resin (Sumi Aqueous adhesive (1) was prepared by mixing 1.5 parts by mass of “Smileze Resin 650” (trade name), 30% solid content working solution) manufactured by Kachemtechs. In addition, the mass part of “Smilease Resin 650” indicates the mass of the solid content.

5). Production of Laminate (1) A triacetyl cellulose film coated with a water-based adhesive (1) on one surface of a polarizing film (1) and hard-coated on the surface (manufactured by Toppan TOMOEGAWA optical film, “ 25KCHC-TC "(trade name), thickness 32 μm), the surface not subjected to the hard coat treatment was bonded to the polarizing film via the aqueous adhesive (1). This was dried at 60 ° C. for 6 minutes to produce a laminate (1) having a protective film on one side.

6). Production of Laminate (2) A curable composition (I) was cured on one side of a cycloolefin film [trade name “ZEONOR” manufactured by Nippon Zeon Co., Ltd.] having a thickness of 50 μm using a bar coater. Coating was performed so that the film thickness was about 3 μm. The polarizing film side of the laminate (1) was bonded to the coated surface to produce a laminate. From the cycloolefin film side of the laminate, an integrated light quantity of 280 nm to 320 nm is 200 mJ / cm ² using an ultraviolet irradiation device with a belt conveyor (the lamp uses “D bulb” manufactured by Fusion UV Systems). Were irradiated with ultraviolet rays to cure the curable composition (I), and then the cycloolefin-based film was peeled off. A laminate (2) composed of a cured product (first cured product layer) of protective film / aqueous adhesive / polarizer film / curable composition (I) was produced.

7). Preparation of Laminate (3) An organic solvent solution of an acrylic pressure-sensitive adhesive was prepared, and the organic solvent solution of the acrylic pressure-sensitive adhesive was subjected to a release treatment to a polyethylene terephthalate film with a thickness of 38 μm [manufactured by Lintec Corporation] , “SP-PLR382020” (trade name), referred to as release film], coated with a die coater so that the thickness after drying is 20 μm, and dried to form a sheet with release film An adhesive was prepared. Then, after laminating the surface (adhesive surface) opposite to the release film of the obtained sheet-like adhesive on the first cured product layer side of the laminate (2), the temperature was 23 ° C., relative It was cured for 7 days under the condition of humidity 65% to obtain a laminate (3) provided with an adhesive layer. This laminate has a configuration in which a release film is bonded onto an adhesive layer.

As an acrylic adhesive, the following are contained.
<Base polymer>
Copolymer of butyl acrylate, methyl acrylate, acrylic acid and hydroxyethyl acrylate <isocyanate-based crosslinking agent>
Ethyl acetate solution of trimethylolpropane adduct of tolylene diisocyanate (solid content concentration 75%) ("Coronate L" (trade name), manufactured by Tosoh Corporation)
<Silane coupling agent>
3-Glycidoxypropyltrimethoxysilane, liquid ("KBM-403" (trade name), manufactured by Shin-Etsu Chemical Co., Ltd.)
<Antistatic agent>
1-hexylpyridinium hexafluorophosphate, a compound represented by the following formula (III).

8). Evaluation of ITO corrosivity An ITO film was formed on one surface of an alkali-free glass by a sputtering method to produce a glass having an ITO film. The glass having this ITO thin film was cut into 25 mm × 25 mm, and the central part on the ITO thin film was measured using a low resistivity meter (“Loresta AX MCP-T370”, manufactured by Mitsubishi Chemical Analytech). Initial resistance value ”. Then, the laminate (3) which was cut into 15 mm × 15 mm, after which the pressure-sensitive adhesive layer of the laminate (3) and ITO thin film was laminated so as to contact, temperature 50 ° C., the pressure 5 kg / ^cm 2 ( 490.3 kPa) for 1 hour and then left for 24 hours in an environment at a temperature of 23 ° C. and a relative humidity of 55%. This was used as a sample for evaluation. Thereafter, the sample for evaluation was put into an environment of 80 ° C. and a relative humidity of 90% for 72 hours and then taken out, and the laminate (3) was peeled off. Next, the ITO thin film was washed with tanol, and the value measured using the same device as above was defined as “resistance value after durability”. From the “initial resistance value” and “resistance value after endurance” measured as described above, an ITO resistance value increase rate was calculated by the following formula, and ITO corrosivity was evaluated according to the following evaluation criteria. The results are shown in Table 2. The numbers in Table 2 indicate the rate of increase in the following formula.
Resistance value increase rate (%) = (resistance value after endurance−initial resistance value) / initial resistance value × 100

◎: Resistance value increase rate is 20% or less ○: Resistance value increase rate exceeds 20% and less than 30% ×: Resistance value increase rate is 30% or more

9. Durability Evaluation of Laminated Body After the laminated body (3) was cut into a size of 30 mm × 30 mm and the release film was peeled off, the pressure-sensitive adhesive layer side of the laminated body (3) was made of alkali-free glass [manufactured by Corning, “EAGLE XG "]. The sample was autoclaved for 1 hour at a temperature of 50 ° C. and a pressure of 5 kg / cm ² (490.3 kPa), and then left for 24 hours in an environment of a temperature of 23 ° C. and a relative humidity of 55%. Next, an optional accessory “film holder with polarizing film” is set in an ultraviolet-visible spectrophotometer (manufactured by Shimadzu Corporation, “UV2450”), and the transmission axis direction and absorption of the laminate in the wavelength range of 380 to 700 nm are set. The transmission spectrum in the axial direction was measured, and based on these, the degree of polarization Py (unit:%) was determined. This degree of polarization was defined as initial Py. Further, the degree of polarization after standing at 80 ° C. in an environment of 90% relative humidity for 24 hours was measured, and this degree of polarization was defined as Py after the test. Based on these, the degree of polarization change ΔPy was calculated by the following formula. The results are shown in Table 1.
ΔPy = post-test Py−initial Py

[Examples 2 to 22 and Comparative Examples 1 to 9]
A first cured product layer and a laminate (3) were obtained in the same manner as in Example 1 using the curable compositions (I) of Production Examples 2 to 31. Using the obtained laminate (3), the ITO resistance value increase rate and the polarization degree change ΔPy were calculated in the same manner as in Example 1. These results are shown in Table 2.

As shown in Table 2, in Examples 1 to 22, the optical layered body in which the absorbance increase rate of the first cured product layer is 30% or less does not corrode ITO even if it is placed under high temperature and high humidity for a long time. It shows that it can suppress effectively. In particular, Examples 4 to 20 and Example 22 show that the optical laminate in which the absorbance increase rate of the first cured product layer is 20% or less can more effectively suppress the corrosion of ITO. In addition, Examples 1 to 22 show that optical laminates having an absorbance increase rate of 30% or less are excellent in durability and can maintain optical performance even under high temperature and high humidity.

As shown in Table 2, Examples 1 to 22 include 40 parts by mass or more of an oxetane compound in which the first cured product layer has two or more oxetanyl groups with respect to a total amount of 100 parts by mass of all polymerizable compounds. It shows that the optical laminated body which is a hardened | cured material layer can suppress the corrosion of ITO more effectively.

DESCRIPTION OF SYMBOLS 1 ... Polarizing film, 2 ... 1st hardened | cured material layer, 3 ... Adhesive layer, 4 ... Conductive layer, 5 ... 2nd hardened | cured material layer, 6 ... 2nd protective film, 7 ... 1st protective film, 10 ... Optical laminated body , X ... substrate

Claims

On one side of a polarizing film containing a dichroic dye in a polyvinyl alcohol resin,
A first cured product layer composed of a cured product of a curable composition containing a polymerizable compound, an adhesive layer,
An optical laminate in which conductive layers are laminated in this order,
The first cured product layer is an optical laminate in which the absorbance increase rate represented by the following formula (1) is 30% or less.
Absorbance increase rate (%) = (Abs after immersion (360 nm) −Abs before immersion (360 nm)) / Abs before immersion (360 nm) × 100 (1)
[In the formula, Abs (360 nm) after immersion indicates the absorbance at 360 nm after the cured product was immersed in an aqueous solution of 50% potassium iodide for 100 hours in an atmosphere at a temperature of 23 ° C. and a relative humidity of 60%. Abs (360 nm) indicates the absorbance at 360 nm before the cured product is immersed in 50% aqueous potassium iodide solution]
On one side of a polarizing film containing a dichroic dye in a polyvinyl alcohol resin,
A first cured product layer composed of a cured product of a curable composition containing a polymerizable compound, an adhesive layer,
An optical laminate in which conductive layers are laminated in this order,
The polymerizable compound includes an oxetane compound having two or more oxetanyl groups, and the content of the oxetane compound is 40 parts by mass or more with respect to 100 parts by mass of the total amount of all polymerizable compounds contained in the curable composition. An optical laminate.
3. The optical laminate according to claim 1, wherein the thickness of the first cured product layer is 0.1 to 15 μm.
4. The optical laminate according to claim 1, wherein the cured product constituting the first cured product layer is a photocured product of a curable composition containing the polymerizable compound.
The optical laminate according to any one of claims 1 to 4, wherein a second cured product layer and a protective film are laminated on a surface of the polarizing film opposite to the first cured product layer.
The optical laminate according to claim 5, wherein the moisture permeability of the protective film is 1200 g / 24 hours or less at a temperature of 23 ° C and a relative humidity of 55%.