KR101910206B1 - Optical laminate, method for manufacturing thereof, and polarizing plate and image display device using the same - Google Patents

Abstract

It is an object of the present invention to provide an optical laminate having an acrylic base material, a primer layer and, if necessary, a hard coat layer in this order, in order to suppress the occurrence of interference fringes and to improve the adhesion between the acrylic base material and the primer layer, The present invention provides a method for efficiently producing a sieve. Wherein the primer layer comprises an acrylic base material, a primer layer and, if necessary, a further hard coat layer in this order, wherein the primer layer contains 50 to 100 mass% (solid content) of polyalkylene glycol di (meth) Wherein the composition is a cured product of an ionizing radiation curable resin composition A, a polarizing plate and an image display apparatus using the same, and a manufacturing method thereof.

Description

Technical Field [0001] The present invention relates to an optical laminate, an optical laminate, a method of manufacturing the same, a polarizing plate using the same, and an image display device using the same. BACKGROUND ART [0002]

The present invention relates to an optical laminate, a method of manufacturing the same, and a polarizing plate and an image display using the same.

In an image display apparatus, an LCD, an EL, an electronic paper, and the like mounted with an LCD, a touch panel, etc. have characteristics such as power saving, light weight, and thinness, and they are rapidly spreading instead of the conventional CRT display.

Since an optical laminate to be used on the surface or inside of such an image display device is required to have hardness so as not to be scratched during handling, a hard coat layer or the like is formed on the light- And the like. For example, in an LCD, a polarizing element is disposed on an image display surface side of a liquid crystal cell, and a hard coat film having a hard coat layer formed on a light transmitting substrate is used as a polarizer protective film. And the like.

Conventionally, as a light-transmitting base material of such a hard coat film, a film comprising a cellulose ester represented by triacetyl cellulose has been used. This is because the cellulose ester has excellent transparency and optical isotropy and has almost no retardation in the plane (low retardation value), so that the vibration direction of the incident linearly polarized light is hardly changed, and the display quality of the liquid crystal display And has water permeability. Therefore, it is based on the advantage that the moisture remaining in the polarizer can be dried through the optical laminate when the polarizing plate using the optical laminate is produced.

However, when the cellulose ester film is used in an environment of high temperature and high humidity as a polarizing plate protective film, a hard coat film based on a cellulose ester film is not sufficient in terms of cost and is not sufficient in moisture resistance and heat resistance, There is a drawback that the function of the polarizing plate such as color or the like is deteriorated.

From the problem of such a cellulose ester film, it is proposed to use a transparent plastic base material having an acrylic resin as a main component which is excellent in transparency, heat resistance and mechanical strength, is inexpensive as compared with the cellulose ester film, .

However, in the case of an optical laminate in which a hard coat layer is formed on one side or both sides of a base material containing an acrylic resin as a main component, adhesion between the acrylic base material and the hard coat layer is deteriorated. Further, when a refractive index difference is generated between the acrylic base material and the hard coat layer and a polarizing plate or the like is formed by using the optical laminate, interference fringes are generated, resulting in appearance defects.

In order to solve such a problem, for example, Patent Document 1 discloses a method in which a substrate film is coated with a paint called an anchor agent or a primer in addition to a physical treatment such as a corona discharge treatment and an oxidation treatment, Thereby improving the adhesion between the base film and the hard coat layer. Further, for example, Patent Document 2 discloses a method of forming irregularities at the interface between a base film and a hard coat layer.

However, in these methods, the steps required for the production of the hard coat film increase, and special processing needs to be performed, resulting in poor productivity.

Japanese Patent Laid-Open No. 11-81359 Japanese Patent Laid-Open No. 8-197670

In addition, as compared with the cellulose ester film and the polyester film which are frequently used in the past, the acrylic base material has a force that swells the base material in all the generally usable solvents, and the base material strongly affects the swelling There is a problem that it is easily received and the substrate itself is broken at the time of processing, and there is also a problem that the technique known in the conventional transparent plastic substrate can not be used as it is in an acrylic substrate.

It is an object of the present invention to provide an optical laminate having an acrylic base material, a primer layer and, optionally, a hard coat layer in this order under such circumstances, It is an object of the present invention to suppress generation of interference fringes and to improve the adhesion between the acrylic base material and the primer layer and to provide a method for efficiently producing the optical laminate.

As a result of intensive studies to solve the above problems, the present inventors have found that, in the optical laminate having an acrylic base material, a primer layer and, if necessary, a hard coat layer in this order in this order, as a primer layer, a polyalkylene glycol It has been found that the above problems can be solved by using a cured product of an ionizing radiation curable resin composition comprising a di (meth) acrylate, a multifunctional polymer and a monomer. The present invention has been completed based on this knowledge.

That is, the present invention provides the following invention.

[1] An optical laminate having an acrylic base material and a primer layer in this order,

Wherein the primer layer is a cured product of an ionizing radiation curable resin composition A containing 50 to 100 mass% (solid content) of a polyalkylene glycol di (meth) acrylate.

[2] The optical laminate according to [1], wherein the acrylic base has a glass transition point (Tg) of 110 to 150 ° C.

[3] The optical laminate according to [1] or [2], wherein the amount of the polyalkylene glycol di (meth) acrylate in the ionizing radiation curable resin composition A is 70 to 100 mass% (solid content).

[4] The optical laminate according to any one of [1] to [3], wherein the polyalkylene glycol di (meth) acrylate has a molecular weight of 180 to 1,000.

[5] The optical laminate according to any one of [1] to [4], wherein the acrylic base material is a drawn acrylic base material.

[6] The optical laminate according to any one of [1] to [5], further comprising a functional layer on a surface of the primer layer opposite to the acrylic base side.

[7] The optical laminate according to [6], wherein the functional layer is a hard coat layer and is a cured product of the ionizing radiation curable resin composition B.

[8] The optical laminate according to any one of [1] to [7], wherein the primer layer contains a functional component.

[9] A polarizing plate comprising the optical laminate according to any one of [1] to [8] laminated on at least one surface of a polarizing film.

[10] An image display apparatus comprising at least one of the optical laminate according to any one of [1] to [8] and the polarizer according to [9].

[11] An ionizing radiation curable resin composition A containing 50 to 100% by mass of a polyalkylene glycol di (meth) acrylate is applied on an acrylic base material in a solid amount, dried and cured to form a primer layer (1) to (8), characterized in that the optical layered body is formed by a method comprising the steps of:

[12] The ionizing radiation curable resin composition according to the above [1], wherein the ionizing radiation curable resin composition A contains at least one selected from methyl isobutyl ketone, 1-butanol, propylene glycol monomethyl ether and isopropanol as the solvent, Wherein the optical layered body is formed by the steps of:

[13] The optical laminate according to [11] or [12], wherein the ionizing radiation curable resin composition B is further applied onto the surface of the primer layer opposite to the acrylic base side, followed by drying and curing to form a functional layer ≪ / RTI >

The optical laminate of the present invention has an acrylic base material, a primer layer and, if necessary, a hard coat layer in this order, thereby suppressing the occurrence of interference fringes and having excellent adhesion between the acrylic base material and the primer layer, The method for producing an optical laminate of the present invention can efficiently produce the above optical laminate.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a scanning electron microscope (STEM) showing a section of one form of the optical laminate of the present invention. FIG.
2 is a scanning electron microscope (STEM) showing a cross section of one form of the optical laminate of the present invention.
3 is a scanning transmission electron microscope (STEM) showing a cross section of the optical laminate of the present invention obtained in Example 10. Fig.
4 shows a scanning transmission electron micrograph (STEM) showing an enlargement from the hard coat layer-primer layer interface to the acrylic base-primer layer interface in the section of the optical laminate of the present invention obtained in Example 10 drawing.
5 is a scanning transmission electron microscope (STEM) showing a cross section of the optical laminate obtained in Comparative Example 8. Fig.
6 is a scanning transmission electron microscope (STEM) image showing an enlargement from the interface between the hard coat layer and the primer layer to the interface between the acrylic base and the primer layer in the cross section of the optical laminate of the present invention obtained in Comparative Example 8 drawing.

The optical laminate according to the present invention is an optical laminate having an acrylic base material, a primer layer and, if necessary, a further hard coat layer in this order, wherein the primer layer comprises a polyalkylene glycol di (meth) To 100% by mass of the ionizing radiation curable resin composition A.

The optical laminate of the present invention can be obtained by laminating a cured product of the ionizing radiation curable resin composition A on an acrylic base material to form an interface between the acrylic base and the primer layer Primer layer interface) may be uneven.

The optical laminate of the present invention is excellent in moisture and heat resistance and smoothness as compared with a base material comprising triacetyl cellulose (TAC) by including an acrylic resin in the base material, can do. In the present specification, the term " acrylic resin " means acrylic and methacrylic.

<Acrylic substrate>

The acrylic resin contained in the acrylic base material is not particularly limited. For example, the acrylic resin is preferably one obtained by polymerizing one or more (meth) acrylic acid alkyl esters in combination, and more specifically, using (meth) . As the acrylic resin, for example, Japanese Patent Application Laid-Open Nos. 2000-230016, 2001-151814, 2002-120326, 2002-254544, And JP-A-2005-146084. An acrylic resin having a lactone ring structure, an acrylic resin having an imide ring structure, or the like may be used.

The acrylic resin preferably has a glass transition point (Tg) of 100 to 150 ° C, more preferably 105 to 135 ° C, and most preferably 110 to 130 ° C. When the glass transition point (Tg) of the acrylic resin is 110 DEG C or more, it is difficult to be damaged by the solvent contained in the composition for forming the primer layer when the primer layer is formed, and if it is 150 DEG C or less, It is easy to form irregularities.

The acrylic base material may contain a resin other than the acrylic resin, but the proportion of the acrylic resin in the acrylic base material is preferably 80 mass% or more, and more preferably 90 mass% or more.

The thickness of the acrylic base material is preferably 20 to 300 占 퐉, more preferably 200 占 퐉 and the lower limit is 30 占 퐉. When the thickness of the acrylic base material is 20 占 퐉 or more, wrinkles do not easily occur in the optical laminate of the present invention. On the other hand, when the thickness is 300 占 퐉 or less, the optical laminate of the present invention becomes thin, and optical characteristics such as light transmittance are excellent.

The acrylic base material is preferably a drawn acrylic base material. By using a drawn acrylic base material, the strength and dimensional stability of the base material can be improved.

The acrylic base material can be produced by, for example, stretching the pellet (chip) comprising an air-moistened acrylic resin, in the longitudinal direction while cooling it after the general melt extrusion, and then stretching it in the transverse direction.

In the melt extrusion process, a screw having one axis, two axes, or two or more axes can be used, and the rotational direction, the number of rotations, and the melting temperature of the screw can be arbitrarily set.

The stretching is preferably performed so as to have a desired thickness after stretching. The drawing magnification is not limited, but is preferably 1.2 times or more and 4.5 times or less. The temperature and humidity at the time of stretching are arbitrarily determined. The stretching method may be a general method.

The acrylic base material may include acrylic rubber particles, an antioxidant, an ultraviolet absorber, a plasticizer and the like.

In the present invention, the acrylic base material may be subjected to surface treatment such as saponification treatment, glow discharge treatment, corona discharge treatment, ultraviolet (UV) treatment and flame treatment within a range not deviating from the object of the present invention.

<Primer Layer>

The primer layer is a cured product of an ionizing radiation curable resin composition A containing 50 to 100 mass% (solid content) of polyalkylene glycol di (meth) acrylate. Herein, in the present specification, the ionizing radiation curable resin composition refers to an electron beam-curable resin composition and an ultraviolet ray curable resin composition.

The ionizing radiation curable resin composition A may further contain a photopolymerizable monomer other than the polyalkylene glycol di (meth) acrylate, a photopolymerizable oligomer, a photopolymerizable polymer, etc. In the case of the ultraviolet ray curable resin composition, do.

(Polyalkylene glycol di (meth) acrylate)

The polyalkylene glycol di (meth) acrylate preferably has a molecular weight of 180 to 1000, more preferably a molecular weight of 200 to 750, and particularly preferably a molecular weight of 220 to 450. When the molecular weight of the polyalkylene glycol di (meth) acrylate is within the above range, it is preferable from the viewpoints of suppression of generation of interference fringes and adhesion of the acrylic base material and the primer layer.

Examples of the polyalkylene glycol di (meth) acrylate include polyethylene glycol di (meth) acrylates such as diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate and tetraethylene glycol di (Meth) acrylate, dipropylene glycol di (meth) acrylate, dipropylene glycol di (meth) acrylate and the like; polypropylene glycol di And polybutylene glycol di (meth) acrylate such as glycol di (meth) acrylate.

The blending amount of the polyalkylene glycol di (meth) acrylate in the ionizing radiation curable resin composition A is required to be 50 to 100 mass%, particularly preferably 70 to 100 mass%, in the solid fraction.

Further, in the case where another functional component such as a refractive index adjusting material or an antistatic material is added to the primer layer, as shown in Fig. 3, the functional component does not exist in the lower part of the primer layer, It is conceivable that the material of the acrylic base material dissolved into the primer layer is dissolved together with the volatilization of the solvent to be described later to form the irregularities at the acrylic base-primer layer interface. As a result, appropriate irregularities are generated at the interface to improve the adhesion, as well as to improve the interference fringe prevention property. In addition, it is easy to exhibit a desired function (antistatic property, high refractive index, and low refractive index) And is also preferable.

(Photopolymerizable polymer)

The photopolymerizable polymer preferably has a (meth) acryloyl group as the functional group, preferably has 10 to 250 functional groups, more preferably 10 to 100, and further preferably 10 to 50 carbon atoms.

The weight average molecular weight of the photopolymerizable polymer is preferably 10,000 to 100,000, more preferably 12,000 to 40,000.

The blending amount of the photopolymerizable polymer in the ionizing radiation curable resin composition A is preferably 0 to 40% by mass, more preferably 0 to 30% by mass in solid content.

(Photopolymerizable oligomer)

The photopolymerizable oligomer is preferably a bifunctional or higher functional oligomer and preferably has a (meth) acryloyl group as the functional group. The photopolymerizable oligomer preferably has 2 to 30 functional groups, more preferably 2 to 20, and more preferably 3 to 15 More preferable.

The weight average molecular weight of the photopolymerizable oligomer is preferably from 1,000 to 10,000, more preferably from 1,500 to 10,000.

The blending amount of the photopolymerizable oligomer in the ionizing radiation curable resin composition A is preferably 0 to 40% by mass, more preferably 0 to 30% by mass, in solid content.

(Photopolymerizable monomer)

Examples of the photopolymerizable monomer include compounds having one or two or more unsaturated bonds such as a compound having a (meth) acryloyl group other than polyalkylene glycol di (meth) acrylate. Examples of monofunctional monomers having one unsaturated bond include ethyl (meth) acrylate, ethylhexyl (meth) acrylate, styrene, methylstyrene, N-vinylpyrrolidone, high refractive index materials Modified acrylate) and the like. Examples of the polyfunctional monomer having two or more unsaturated bonds include polyfunctional monomers such as polymethylol propane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol hexa (Meth) acrylate, dipentaerythritol penta (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate and the like, and ethylene oxide Modified polyfunctional compounds, or reaction products of the polyfunctional compounds with (meth) acrylate (e.g., poly (meth) acrylate esters of polyhydric alcohols).

By using a monofunctional monomer, the refractive index can be easily adjusted and a primer layer having a higher refractive index can be formed. On the other hand, when a polyfunctional monomer is used, the hardness becomes better. In the present specification, "(meth) acrylate" refers to methacrylate and acrylate.

The molecular weight of the photopolymerizable monomer is preferably 200 to 1,000, more preferably 250 to 750.

The blending amount of the photopolymerizable monomer in the ionizing radiation curable resin composition A is preferably 0 to 40 mass%, more preferably 0 to 30 mass%, in solid content.

It is preferable that the ionizing radiation curable resin composition A further contains a solvent.

The solvent is preferably selected so as to swell the acrylic base material appropriately. However, unlike the conventional TAC substrate, acrylic base materials swell in almost all kinds of solvents. Therefore, it is possible to swell adequately by selecting the following solvents, and it is possible to obtain a balance of the resin component constituting the base material and the resin component constituting the resin layer moving So that a preferable ridge line can be obtained at the interface.

The solvent may be selected depending on the type and solubility of the resin component to be used. As such a solvent, alcohols (methanol, ethanol, isopropanol, 1-butanol) are preferable, and in each of the other types of solvents, the number of carbon atoms tends to be better and the rate of evaporation tends to be higher . For example, methyl isobutyl ketone may be used as the ketone, toluene as the aromatic hydrocarbon, and propylene glycol monomethyl ether as the glycol, and a mixed solvent thereof may be used.

Particularly, in the present invention, it is possible to provide a resin composition which is excellent in compatibility with a resin, application workability, has a specific irregular shape at the interface of the acrylic base material and primer layer, , Particularly preferably at least one selected from methyl isobutyl ketone, isopropanol, 1-butanol, and propylene glycol monomethyl ether. With these solvents, the acrylic base material can be swelled adequately without cracking.

On the contrary, it is also possible to use esters (such as methyl acetate, ethyl acetate, propyl acetate and butyl acetate), ketones (acetone, methyl ethyl ketone, cyclohexanone, diacetone alcohol), cellosolve, ethers (dioxane, tetrahydrofuran , Propylene glycol monomethyl ether acetate and the like), aliphatic hydrocarbons (such as hexane), aromatic hydrocarbons (xylene), halogenated carbons (such as dichloromethane and dichloroethane), cellosolve (methylcellosolve, , Etc.), cellosolve acetates, sulfoxides (dimethylsulfoxide and the like), and amides (dimethylformamide, dimethylacetamide, etc.) sometimes excessively swell the acrylic base material, so that when tension is applied to the base material It is preferable not to use it.

The content of the solvent in the ionizing radiation curable resin composition A is not particularly limited. For example, the preferable solvent is 30 to 300 parts by mass relative to 100 parts by mass of the solid content of the ionizing radiation curable resin composition A More preferably 100 to 220 parts by mass. If the content of the solvent is 30 parts by mass or more based on 100 parts by mass of the solid content of the ionizing radiation curable resin composition A, the irregularities of the interface of the acrylic base material and the primer layer become prominent and the adhesion of the acrylic material and the primer layer, , And when it is 300 parts by mass or less, it is preferable from the viewpoint of suppressing the occurrence of haze.

The method for producing an optical laminate of the present invention preferably has the following first to fourth steps, and it is preferable from the viewpoint of imparting hardness to the optical laminate if the fifth step is further provided.

(First step)

An ionizing radiation curable resin composition A containing 50% or more of a polyalkylene glycol di (meth) acrylate is applied to an acrylic substrate.

(Second Step)

The acrylic base material is swelled by the solvent, the monomer, and the like in the ionizing radiation curable resin composition A.

(Third step)

While the solvent is dried at an appropriate drying temperature, the acrylic base material is swollen and the material components in the acrylic base material and the components in the ionizing radiation curable resin composition A move with each other to form irregularities at the acrylic base / primer layer interface.

(Fourth step)

The ionizing radiation curable resin composition A is cured by irradiating ionizing radiation to cure the primer layer.

(Step 5)

The ionizing radiation curable resin composition B is separately applied on the primer layer, dried, and irradiated with ionizing radiation to be cured to form a hard coat layer.

In the method for producing an optical laminate of the present invention, it is preferable that the following conditions (i) to (iii) are satisfied so that the acrylic base material can be processed without breaking, and further, desirable.

(I) The ionizing radiation curable resin composition A contains 50 to 100% by mass of a polyalkylene glycol di (meth) acrylate.

(Ii) the ionizing radiation-curable resin composition A contains a solvent which appropriately swells the acrylic base material so that the acrylic base material is not broken during processing.

(Iii) the drying temperature in the third step is 40 ° C to 90 ° C.

Even if the solvent of the ionizing radiation curable resin composition A is of the above-mentioned appropriate type, if the drying temperature exceeds 90 캜, the attack force of the solvent is increased, and the acrylic base material is liable to be broken at the time of processing.

By satisfying all of the conditions (i) to (iii), it becomes possible to easily produce an optical laminate in which the irregularities of the interface between the acrylic base material and the primer layer are preferable. As a result, interference fringe prevention and adhesion are improved.

The ionizing radiation curable resin composition A may further contain a solvent-drying type resin. By using the solvent-drying type resin in combination, it is possible to effectively prevent coating defects on the coated surface. The above-mentioned solvent-drying type resin refers to a resin such as a thermoplastic resin, which is only used to dry a solvent added to adjust the solid content at the time of coating, and becomes a coating film.

The solvent-drying resin is not particularly limited, and a thermoplastic resin can be generally used.

The thermoplastic resin is not particularly limited and examples thereof include thermoplastic resins such as styrene resin, (meth) acrylic resin, vinyl acetate resin, vinyl ether resin, halogen-containing resin, alicyclic olefin resin, polycarbonate resin, A polyester resin, a polyamide resin, a cellulose derivative, a silicone resin and a rubber or an elastomer. The thermoplastic resin is preferably amorphous and soluble in an organic solvent (in particular, a common solvent capable of dissolving a plurality of polymers or curable compounds). Particularly, styrene resins, (meth) acrylic resins, alicyclic olefin resins, polyester resins, cellulose derivatives (such as cellulose esters) and the like are preferable from the viewpoints of film formability, transparency and weather resistance.

The initiator is not particularly limited and known ones can be used. Specific examples of the photopolymerization initiator include acetophenones, benzophenones, meihylbenzoylbenzoates,? -Amyloxime esters, , Propiophenes, benzyls, benzoins, and acylphosphine oxides. Further, it is preferable to use a mixture of photosensitizer. Specific examples thereof include n-butylamine, triethylamine, poly-n-butylphosphine and the like.

As the photopolymerization initiator, in the case of a resin system in which the photopolymerizable monomer / oligomer / polymer has a radically polymerizable unsaturated group, the photopolymerization initiator may be selected from the group consisting of acetophenones, benzophenones, thioxanthones, benzoins, benzoin methyl ethers, Cyclohexyl-phenyl-ketone is particularly preferable from the viewpoint of compatibility with the ionizing radiation curable resin and yellowing. When the photopolymerizable monomer / oligomer / polymer has a cationic polymerizable functional group, examples of the photopolymerization initiator include aromatic diazonium salts, aromatic sulfonium salts, aromatic iodonium salts, metallocene compounds, benzoin sulfonic acid esters and the like. It is preferably used alone or as a mixture.

The content of the initiator in the ultraviolet-curable resin composition is preferably 1 to 10 parts by mass based on 100 parts by mass of the total amount of the photopolymerizable monomer, the photopolymerizable oligomer and the photopolymerizable polymer. When the content of the initiator is 1 part by mass or more, the amount is preferably in view of the hardness of the primer layer in the optical laminate, and when it is 10 parts by mass or less, the resin deterioration due to excessively remaining initiator is suppressed, And the pencil hardness of the surface of the target primer layer or the hard coat layer to be described later can be obtained.

A more preferable lower limit of the content of the initiator is 2 parts by mass based on 100 parts by mass of the total amount of the photopolymerizable monomer, the photopolymerizable oligomer and the photopolymerizable polymer, and the more preferable upper limit is 8 parts by mass. When the content of the initiator is in this range, the above effect is more assured.

By containing a functional component in the ionizing radiation curable resin composition A, the primer layer can further be given a function.

Examples of the functional component include those used in conventional optical sheets such as an antistatic agent, a refractive index adjusting agent, an antifouling agent, a slip agent, a dispersant, and a hard coatability-imparting agent.

The ionizing radiation curable resin composition A may contain an antistatic agent.

As the antistatic agent, organic ones are preferable, and more specifically, ionic ones such as lithium ion salts, quaternary ammonium salts and ionic liquids, and electron conductive ones such as polythiophene, polyaniline, polypyrrole and polyacetylene can be given .

The ionizing radiation curable resin composition A may contain an antifouling agent such as fluorine or silicon.

When the functional ingredient is used, the content thereof is preferably 1 to 30% by mass based on the total mass of solids in the ionizing radiation curable resin composition A.

In the optical laminate of the present invention, when a primer layer is formed using an ionizing radiation curable resin composition A containing an antistatic agent (that is, when the primer layer contains an antistatic agent), the above-mentioned polyalkylene glycol By the combination with di (meth) acrylate, the antistatic property is further improved because the antistatic agent is localized on the upper surface of the primer layer for the above reason. Further, when a primer layer is formed by using an ionizing radiation curable resin composition A containing ultrafine particles such as silica or alumina as a hard coatability-imparting agent (that is, when the primer layer contains a hard coatability-imparting agent) By virtue of the combination of the polyalkylene glycol di (meth) acrylate and the polyalkylene glycol di (meth) acrylate, the hard coat property is further improved because the hard coat property imparting agent is localized on the top surface of the primer layer.

The ionizing radiation curable resin composition A can be produced by any known method such as a paint shaker, a bead mill, a kneader, a mixer and the like without particular limitation as long as the components can be uniformly mixed .

The method of applying the ionizing radiation curable resin composition A onto the acrylic base material is not particularly limited and examples thereof include spin coating, dipping, spraying, die coating, bar coating, gravure coating, A known method such as a roll coater method, a meniscus coater method, a flexo printing method, a screen printing method, and a bead coater method.

The coating film formed by applying the ionizing radiation curable resin composition A onto the acrylic base material is preferably heated, dried, and cured by irradiation with active energy rays or the like, if necessary.

The drying time in the drying step is preferably 20 seconds to 2 minutes, more preferably 30 seconds to 1 minute. The drying temperature in the drying step is preferably 40 to 90 占 폚, more preferably 50 to 80 占 폚. If the drying temperature is less than 40 占 폚, the amount of the residual solvent in the processed optical stacked body is increased, and uncured portions are generated in the subsequent curing step, and the adhesion is lowered due to the influence. In the case of an acrylic base material, generally, any solvent is likely to swell. Therefore, when the drying temperature is out of the preferable range and exceeds 100 ° C, the force against the swelling of the solvent is improved, and when the applied tension exceeds 2.2 N / cm, it tends to be broken. Therefore, in the present invention, it is preferable to select an appropriate solvent and select an appropriate drying temperature.

As the active energy ray irradiation, irradiation with ultraviolet rays or electron beams can be mentioned.

Specific examples of the ultraviolet source in the ultraviolet irradiation include light sources such as ultrahigh pressure mercury lamp, high pressure mercury lamp, low pressure mercury lamp, carbon arc lamp, black light fluorescent lamp, metal halide lamp and the like. As the wavelength of ultraviolet rays, a wavelength range of 190 to 380 nm can be used.

Specific examples of the electron beam source in the electron beam irradiation include various types of electron beam accelerators such as a Cocross Walton type, a Bandegraft type, a resonant transformer type, an insulating core transformer type, or a linear type, a dinamitron type and a high frequency type.

The primer layer preferably has a film thickness (at the time of curing) of 0.5 to 100 占 퐉, more preferably 0.8 to 13 占 퐉, particularly excellent in anti-curl property and anti-cracking property, and is most preferably in the range of 0.8 to 4 占 퐉 to be. The film thickness of the hard coat layer is an average value (占 퐉) obtained by observing a cross section with an electron microscope (SEM, TEM, STEM) and measuring arbitrary 10 points.

The optical laminate of the present invention may have at least one selected from the group consisting of a low refractive index layer, a hard coat layer, a scattering layer, an antiglare layer, an antistatic layer and a high refractive index layer directly on the primer layer.

<Hard coat layer>

The hard coat layer is formed on the primer layer, and preferably the ionizing radiation curable resin composition B is composed of a cured product.

The hard coat layer preferably has a hardness of H or more and more preferably 2H or more in a pencil hardness test (load 4.9 N) according to JIS K5600-5-4 (1999). The hard coat layer may contain a functional component.

The details of the ionizing radiation curable resin composition B forming the hard coat layer are the same as those of the above ionizing radiation curable resin composition A except that the polyalkylene glycol di (meth) acrylate is not an essential component.

In the ionizing radiation curable resin composition B, the blending amount of the photopolymerizable monomer (particularly, the polyfunctional monomer) is preferably 30 to 100 mass%, more preferably 40 to 90 mass%, and more preferably 50 to 80 mass% More preferable. At this time, it is preferable that the remaining amount of the ionizing radiation curable resin composition B is at least one of a photopolymerizable oligomer and a photopolymerizable polymer.

The method of forming the hard coat layer is the same as that of the above-described primer layer. Details of other hard coat layers are the same as those of the above-described primer layer.

In the present invention, it is preferable to laminate a hard coat layer on the primer layer. The primer layer itself may have a high hardness by using an ionizing radiation curable resin composition A having a high ratio of trifunctional or more polyfunctional monomers or by adding a hard coat imparting agent. However, the primer layer itself may have a high hardness by directly imparting a reactive functional group , There is a drawback that the acrylic base material tends to be cracked, for example, when some partial pressure is applied to the hard coat layer. Therefore, in the optical laminate of the present invention, by forming the primer layer between the hard coat layer and the hard coat layer, the impact of the hard coat layer is not transmitted to the acrylic substrate as it is, do. In addition, the hardness can be improved as compared with the case where only the hard coat layer is laminated even by using the primer layer / hard coat layer.

However, when a hard coat layer or the like is laminated, a new interface is formed between the primer layer and the primer layer, that is, an interference fringe occurs. In this case, it is important that the refractive index of the layer to be laminated is as close as possible to the layer below it. Therefore, in order to maintain good interference fringe prevention properties, the refractive index of the hard coat layer is preferably approximately the same as the refractive index of the primer layer, and the refractive index difference with respect to the primer layer is 0.03 or less. The thickness of the hard coat layer is preferably 1 to 20 mu m, more preferably 3 to 15 mu m.

<Low Refractive Index Layer>

Further, it is preferable that the optical laminate of the present invention further has a low refractive index layer on the hard coat layer.

Preferable examples of the low refractive index layer include 1) a resin containing low refractive index inorganic fine particles such as silica or magnesium fluoride, 2) a fluororesin as a low refractive index resin, and 3) a resin containing low refractive index inorganic fine particles such as silica or magnesium fluoride A fluorine resin, and 4) a low refractive index inorganic thin film such as silica or magnesium fluoride. As the resin other than the fluorine resin, the same resin as the above-mentioned acrylic resin can be used.

The above-mentioned silica is preferably hollow silica fine particles, and such hollow silica fine particles can be produced, for example, by the production method described in the embodiment of Japanese Patent Application Laid-Open No. 2005-099778.

These low refractive index layers preferably have a refractive index of 1.47 or less, particularly 1.42 or less. The thickness of the low refractive index layer is not limited, but it may be suitably set within a range of usually about 10 nm to 1 占 퐉.

As the fluororesin, at least a polymerizable compound containing a fluorine atom in a molecule or a polymer thereof may be used. The polymerizable compound is not particularly limited, but preferably has a curing-reactive group such as a functional group which is cured by ionizing radiation or a polar group which is thermally cured. Further, a compound capable of simultaneously combining these reactive groups may also be used. With respect to the polymerizable compound, the polymer does not have any reactive group as described above.

As the polymerizable compound having a functional group which is cured by the above ionizing radiation, a fluorine-containing monomer having an ethylenic unsaturated bond can be widely used. More specifically, fluoroolefins (e.g., fluoroethylene, vinylidene fluoride, tetrafluoroethylene, hexafluoropropylene, perfluorobutadiene, perfluoro-2, 2-dimethyl- -Dioxol and the like) can be exemplified. (Meth) acryloyloxy group include 2,2,2-trifluoroethyl (meth) acrylate, 2,2,3,3,3-pentafluoropropyl (meth) acrylate, 2- (Perfluorohexyl) ethyl (meth) acrylate, 2- (perfluorohexyl) ethyl (meth) acrylate, 2- ) (Meth) acrylate compounds having fluorine atoms in the molecule, such as ethyl (meth) acrylate, methyl? -Trifluoromethacrylate and ethyl? -Trifluoromethacrylate; (Meth) acrylic acid having at least three fluorine atoms, a fluoroalkyl group having 1 to 14 carbon atoms, a fluorocycloalkyl group or a fluoroalkylene group having at least two fluorine atoms and at least two fluorine-containing (meth) acryloyloxy groups Ester compounds and the like.

Preferred examples of the thermosetting polar group include a hydrogen bond forming group such as a hydroxyl group, a carboxyl group, an amino group, and an epoxy group. These are excellent not only in adhesion to the coating film but also in affinity with inorganic ultrafine particles such as silica. As the polymerizable compound having a thermosetting polar group, for example, a 4-fluoroethylene-perfluoroalkyl vinyl ether copolymer; Fluoroethylene-hydrocarbon-based vinyl ether copolymers; Fluorine-modified products of various resins such as epoxy, polyurethane, cellulose, phenol, and polyimide.

Examples of the polymerizable compound having a polar group capable of being thermally cured by a functional group cured by the ionizing radiation include acrylic or methacrylic acid moieties and fully fluorinated alkyl, alkenyl, aryl esters, fully or partially fluorinated vinyl ethers, Partially-fluorinated vinyl esters, fully or partially fluorinated vinyl ketones, and the like.

Examples of the fluorine-based resin include the following.

A polymer of a monomer or monomer mixture containing at least one fluorine-containing (meth) acrylate compound of the polymerizable compound having an ionizing radiation curable group; (Meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (Meth) acrylate compounds which do not contain a fluorine atom in the molecule such as acrylate; Fluoroethylene, vinylidene fluoride, trifluoroethylene, chlorotrifluoroethylene, 3,3,3-trifluoropropylene, 1,1,2-trichloro-3,3,3-trifluoropropylene, Homopolymers or copolymers of fluorine-containing monomers such as hexafluoropropylene. Silicon-containing vinylidene fluoride copolymers containing a silicone component in these copolymers may also be used. Examples of the silicone component in this case include (poly) dimethylsiloxane, (poly) diethylsiloxane, (poly) diphenylsiloxane, (poly) methylphenylsiloxane, alkyl modified (poly) dimethylsiloxane, azo group- A silicon-containing silicon, an alkoxy group-containing silicone, a phenol group-containing silicone, a methacryl-modified silicone, an alkylaryl-modified silicone, a fluoro silicone, a polyether-modified silicone, a fatty acid ester- , Acryl modified silicone, amino modified silicone, carboxylic acid modified silicone, carbinol modified silicone, epoxy modified silicone, mercapto modified silicone, fluorine modified silicone, polyether modified silicone and the like. Among them, those having a dimethylsiloxane structure are preferable.

In addition, a non-polymer or a polymer comprising the following compounds can also be used as the fluorine resin. That is, a compound obtained by reacting a fluorine-containing compound having at least one isocyanato group in a molecule with a compound having at least one functional group reactive with an isocyanato group such as an amino group, a hydroxyl group or a carboxyl group in a molecule; A compound obtained by reacting a fluorine-containing polyol such as a fluorine-containing polyether polyol, a fluorine-containing alkylpolyol, a fluorine-containing polyesterpolyol and a fluorine-containing? -Caprolactone-modified polyol with a compound having an isocyanato group.

The composition for forming a low refractive index layer may contain the thermoplastic resin as described above together with the above-mentioned polymerizable compound or polymer having a fluorine atom. In addition, various additives and solvents can be suitably used to improve the curing agent for curing the reactive group or the like, the application workability, or the antifouling property.

In forming the low refractive index layer, the viscosity of the composition for forming a low refractive index layer is preferably in the range of 0.5 to 5 mPa ㆍ (25 캜), preferably 0.7 to 3 mPa ㆍ (25 캜) . It is possible to realize an excellent antireflection layer of visible light and to form a thin film which is uniform and free from coating irregularities and can form a low refractive index layer with particularly excellent adhesion.

The curing means of the resin may be the same as the curing means in the above-mentioned hard coat layer. When a heating means is used for the curing treatment, it is preferable that, for example, a thermal polymerization initiator which generates radicals to initiate polymerization of the polymerizable compound by heating is added to the composition for forming a low refractive index layer.

The optical laminate of the present invention preferably has a total light transmittance of 80% or more. If it is less than 80%, there is a fear that the color reproducibility and visibility may be impaired in the case of being mounted on the image display apparatus, and there is a possibility that the desired contrast may not be obtained. The total light transmittance is more preferably 90% or more. The haze is preferably 0.8% or less, more preferably 0.5% or less.

The total light transmittance can be measured by a method in accordance with JIS K-7361 using a haze meter (Murakami Shikigi Co., Ltd., product number: HM-150).

The optical laminate of the present invention preferably has a haze of 1% or less. If it is 1% or less, desired optical characteristics are obtained, and there is no deterioration in optical characteristics when the optical laminate of the present invention is provided on the image display surface.

The haze can be measured by a method in accordance with JIS K-7136 using a haze meter (Murakami Shikigi Co., Ltd., product number: HM-150).

The polarizing plate of the present invention is formed by laminating the optical laminate of the present invention on at least one surface of a polarizing film.

The polarizing film is not particularly limited, and for example, a stretched polyvinyl alcohol film, a polyvinyl formal film, a polyvinyl acetal film, and an ethylene-vinyl acetate copolymerization system saponified film can be used which are dyed with iodine or the like . In the lamination treatment of the polarizing film and the optical laminate, it is preferable to saponify the acrylic base material. By the saponification treatment, the adhesiveness is improved and an antistatic effect can be obtained.

The present invention also provides an image display apparatus comprising at least one of the optical laminate and the polarizer.

Examples of the image display device include a television, a computer, an LCD, a PDP, an FED, an ELD (organic EL, inorganic EL), a CRT, a tablet PC, an electronic paper, a mobile phone, It can also be applied to panels.

The LCD, which is a typical example of the above, comprises a transmissive display body and a light source device for irradiating the transmissive display body from the back side. When the image display apparatus of the present invention is an LCD, at least one of the optical laminate of the present invention and the polarizing plate of the present invention is formed on the surface of the transmissive display body. However, in the case of an image display apparatus having a touch panel mounted thereon, it can be used not only as a surface but also as a transparent substrate constituting a touch panel.

The LCD, which is a typical example of the above, comprises a transmissive display body and a light source device for irradiating the transmissive display body from the back side. When the image display apparatus of the present invention is an LCD, at least one of the optical laminate of the present invention and the polarizing plate of the present invention is formed on the surface of the transmissive display body. In addition, in the case of an image display device on which a touch panel is mounted or in an LCD, it may be used not only as a surface but also as a transparent substrate constituting the inside of the device.

In the liquid crystal display device of the present invention, the light source of the light source device is irradiated from the lower side of the optical laminate or the polarizing plate. Further, a phase difference plate may be inserted between the liquid crystal display element and the polarizing plate. An adhesive layer may be formed between each layer of the liquid crystal display device, if necessary.

In the case where the present invention is a liquid crystal display device having the optical laminate, the backlight light source in the liquid crystal display device is not particularly limited, but is preferably a white light emitting diode (white LED) Is preferably a VA mode or IPS mode liquid crystal display device having a white light emitting diode as a backlight source.

The white LED is a device that emits white light by combining a phosphor or a light emitting diode that emits blue light or ultraviolet light using a phosphor compound, that is, a compound semiconductor. Among them, a white light emitting diode including a light emitting element comprising a combination of a blue light emitting diode using a compound semiconductor and a yttrium aluminum / garnet yellow phosphor has a continuous and broad emission spectrum, and therefore has excellent antireflection performance and spot contrast And it is also suitable as the backlight light source in the present invention because the light emission efficiency is also excellent. In addition, since a white LED having a small power consumption can be widely used, the effect of energy saving can also be exhibited.

The VA (Vertical Alignment) mode is an operation mode in which the liquid crystal molecules are oriented so that the liquid crystal molecules are perpendicular to the substrate of the liquid crystal cell when no voltage is applied and the dark display is indicated by the collapse of the liquid crystal molecules by application of a voltage .

The IPS (In-Plane Switching) mode is a mode in which the liquid crystal is rotated in the plane of the substrate by the electric field in the horizontal direction applied to the interdigital electrode pairs provided on one substrate of the liquid crystal cell to perform display.

Wherein the PDP as the image display device comprises a surface glass substrate having electrodes formed on the surface thereof, and a discharge gas is disposed in confrontation with the surface glass substrate, electrodes and fine grooves are formed on the surface, And a rear glass substrate on which red, green and blue phosphor layers are formed. When the image display apparatus of the present invention is a PDP, the above-described optical laminate may be provided on the surface of the surface glass substrate or on the front surface plate (glass substrate or film substrate) thereof.

The image display device includes an ELD device for depositing zinc sulfide, a diamine substance, and a light emitting substance, which emit light when a voltage is applied, on a glass substrate and controlling the voltage applied to the substrate to perform display, It may be an image display device such as a CRT that generates a visible image of the image. In this case, the above-mentioned optical laminate is provided on the outermost surface of each display device or on the surface of the front surface plate.

[Example]

Next, the present invention will be described in more detail by way of examples, but the present invention is not limited at all by this example.

Example 1

(Preparation of acrylic base material (1)) [

The polymer is extruded from the gap of the die by a melt extrusion method while melting and kneading the pellets comprising a copolymer of methyl methacrylate and methyl acrylate (glass transition point: 130 ° C) and removing foreign matter through a filter Respectively. Subsequently, the polymer was stretched 1.2 times in the longitudinal direction while cooling the polymer, and then stretched 1.5 times in the transverse direction to obtain an acrylic base material 1 having a thickness of 40 占 퐉.

(Preparation of composition for forming primer layer)

100 parts by mass of tetraethylene glycol diacrylate ("M240" available from Toagosei Co., Ltd.) and 4 parts by mass of an initiator ("Irg184" manufactured by BASF) were dissolved in 150 parts by mass of methyl isobutyl ketone, To prepare a composition for forming a layer.

The composition of the composition for forming a primer layer is shown in Table 1.

(Production of composition 1 for hard coat layer formation)

50 parts by mass of dipentaerythritol hexaacrylate (manufactured by Nippon Kayaku Kabushiki Kaisha), 50 parts by mass of urethane acrylate ("UV1700B", 10 functionalities, weight average molecular weight: 2, 000, manufactured by Nippon Gosei Chemical Industry Co., And 4 parts by mass of an initiator ("Irg184" manufactured by BASF) were dissolved in 150 parts by mass of methyl isobutyl ketone to prepare a composition 1 for hard coat layer formation.

(Production of optical laminate)

A composition for forming a primer layer was applied on an acrylic base material by a die coating method and dried at 70 DEG C for 1 minute to evaporate the solvent so that the coating amount after drying was 4 g / Layer. The obtained coating film was irradiated with ultraviolet rays at an irradiation dose of 70 mJ / cm2 to make the coating film semi-cured (Half Cure state).

Next, the hard coat layer forming composition 1 was coated on the primer layer formed as described above by a die coating method and dried at 70 DEG C for 1 minute to evaporate the solvent to obtain a coating amount after drying of 8 g / M &lt; 2 &gt; (dry film thickness 7 mu m). The obtained coating film was irradiated with ultraviolet rays at an ultraviolet radiation dose of 200 mJ / cm2 to completely cure the coating film (full cure state) to obtain an optical laminate.

Examples 2 to 16, Comparative Examples 1 to 9 and Reference Examples 1 to 7

An optical laminate was obtained in the same manner as in Example 1 except that the composition and the drying temperature of the composition for forming the primer layer were changed to those shown in Tables 1 and 2.

Example 17

An optical laminate was obtained in the same manner as in Example 1 except that the hard coat layer forming composition 2 prepared as described below was used as the composition for forming a hard coat layer instead of the composition 1 for hard coat layer formation .

(Preparation of composition 2 for hard coat layer formation)

30 parts by mass of dipentaerythritol hexaacrylate (manufactured by Nippon Kayaku Kabushiki Kaisha), 46 parts by mass of urethane acrylate ("BS577", 6-functional group, weight average molecular weight: 1,000, manufactured by Arakawa Chemical Industries, , 4 parts by mass of a quaternary ammonium salt-containing oligomer ("1SX3000" manufactured by Daesung Fine Chemical Co., Ltd.) and 20 parts by mass of an initiator (BASF), 20 parts by mass of a monomer ("M315", trifunctional, manufactured by Toagosei Co., 4 parts by mass of "Irg184" manufactured by Mitsubishi Chemical Corporation) were dissolved in 130 parts by mass of methyl isobutyl ketone and 20 parts by mass of N-butanol to prepare a composition 2 for hard coat layer formation.

The optical laminate obtained in Example 17 has an antistatic property because it contains an antistatic agent in the hard coat layer.

The following evaluations were carried out on the optical laminate obtained in Examples 1 to 17, Comparative Examples 1 to 9, and Reference Examples 1 to 7. The results are shown in Tables 1 and 2.

(Adhesion)

On the basis of JIS K 5600, a total of 100 checkerboard eyes were formed in a 1 mm square on the hard coat layer of the optical laminate, and a total of five checkerboard eyes were formed using a 24 mm cellophane tape (registered trademark) manufactured by Nichiban Co., Ltd. for five consecutive The peel test was conducted to measure the amount of the remaining grid.

According to the number of ungrooved grids, the following evaluation was made. ○ The level above is good as a product.

A: 90-100

B: 80-89

C: 50-79

D: less than 50

(Interference stripes)

After a black tape was bonded to the surface of the optical laminate opposite to the hard coat layer, the presence or absence of interference fringe was visually observed under a three-wavelength tube fluorescent lamp. A when the interference fringe can not be seen, A when the fringe was visible, B when the fringe was visible, and C when the fringe was visible.

(Manufacturing processability)

The composition for forming a primer layer was applied on an acrylic substrate and dried, thereby performing a tensile test. The degree of tension was 2.2 N / cm.

As a result, it was evaluated as &quot; defective &quot; when a problem occurred in the manufacturing process due to a slight break even when the tension was not broken when the tension was &quot; good &quot;.

In the optical laminate having poor manufacturing processability, the physical properties of the substrate itself are weakened, so that even if the primer layer, the hard coat layer and the like are cured, the pencil hardness (JIS K5600-5-4) does not exceed 2H.

(Surface resistance)

The surface resistivity of each of the optical stacks prepared in the above examples and comparative examples was measured using a surface resistivity meter (Hirestr HT-210, manufactured by Mitsubishi Yuka Co., Ltd.).

PEG di (meth) acrylate 1: tetraethylene glycol diacrylate ("M240" manufactured by Toagosei Co., Ltd., molecular weight: 286)

PEG di (meth) acrylate 2: triethylene glycol dimethacrylate ("Light Ester 3EG", molecular weight: 270, manufactured by Kyoeisha Chemical Co., Ltd.)

PEG di (meth) acrylate 3: tetraethylene glycol dimethacrylate ("Light Ester 4EG", molecular weight: 314, manufactured by Kyoeisha Chemical Co., Ltd.)

Maleimide polymer: (&quot; UVT302 &quot;, manufactured by Toagosei Co., Ltd.)

PETA: pentaerythritol triacrylate

Multifunctional polymer: "BS371" manufactured by Arakawa Chemical Industries, Ltd.

Polyfunctional oligomer: manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd., &quot; R1403 &quot;

Monomer 1: dipentaerythritol hexaacrylate, manufactured by Nippon Kayaku Co., Ltd.

Monomer 2: o-phenylphenol EO-modified acrylate, Shin-Nakamura Kagaku Kogyo Co., Ltd.

Quaternary ammonium salt: &quot; Colcoat NR121X &quot;

ATO particles: Methylisobutyl ketone dispersion of antimony doped tin oxide "EPT5DL2MIBK" manufactured by Mitsubishi Materials Denshi Kasei Kabushiki Kaisha

Reactive silica: "MIBKSD" manufactured by Nissan Chemical Industries, Ltd., average particle diameter: 12 nm

Zirconia: MEK dispersion of zirconium oxide (solid dispersion 30% dispersion, manufactured by SAKAI CHEMICAL INDUSTRY CO., LTD., &Quot; SZR-K 4nm &

MIBK: methyl isobutyl ketone

PGME: Propylene glycol monomethyl ether

MEK: methyl ethyl ketone

Further, in the production of the optical laminate in Examples 1 to 17, the following first through fifth processes are carried out.

(First step)

An ionizing radiation curable resin composition A containing 50% or more of a polyalkylene glycol di (meth) acrylate is applied to an acrylic substrate.

(Second Step)

The acrylic base material is swelled by the solvent, the monomer, and the like in the ionizing radiation curable resin composition A.

(Third step)

While the solvent is dried at an appropriate drying temperature, the acrylic base material is swollen and the material components in the acrylic base material and the components in the ionizing radiation curable resin composition A move with each other to form irregularities at the acrylic base / primer layer interface.

(Fourth step)

The ionizing radiation curable resin composition A is cured by irradiating ionizing radiation to cure the primer layer.

(Step 5)

The ionizing radiation curable resin composition B is separately applied onto the primer layer, dried, and irradiated with ionizing radiation to be hardened to form a hard coat layer.

For this reason, an optical laminate in which the acrylic base material, which is an object of the present invention, is not broken at the time of processing, good interference fringe pattern adhesion, good adhesion, and pencil hardness of 2H or more is obtained.

INDUSTRIAL APPLICABILITY The optical laminate of the present invention can be applied to a display such as a cathode ray tube display (CRT), a liquid crystal display (LCD), a plasma display (PDP), an electroluminescence display (ELD), a touch panel, And can be suitably used for a high-definition display.

1: Acrylic substrate
2: Primer layer
3: Hard coat layer
4: Acrylic base-primer layer interface

Claims (13)

An acrylic base material, and a primer layer in this order,
Wherein the primer layer is a cured product of an ionizing radiation curable resin composition A containing 50 to 100 mass% (solid content) of polyalkylene glycol di (meth) acrylate. The method according to claim 1,
Wherein the acrylic base has a glass transition point (Tg) of 110 to 150 ° C. 3. The method according to claim 1 or 2,
Wherein an amount of the polyalkylene glycol di (meth) acrylate in the ionizing radiation curable resin composition A is 70 to 100 mass% (solid content). 3. The method according to claim 1 or 2,
Wherein the polyalkylene glycol di (meth) acrylate has a molecular weight of 180 to 1,000. 3. The method according to claim 1 or 2,
Wherein the acrylic base material is a stretched acrylic base material. 3. The method according to claim 1 or 2,
And a functional layer on a surface of the primer layer opposite to the acrylic substrate side. The method according to claim 6,
Wherein the functional layer is a hard coat layer and is a cured product of the ionizing radiation curable resin composition B. 3. The method according to claim 1 or 2,
Wherein the primer layer contains a functional component. A polarizing plate comprising the optical laminate according to claim 1 or 2 laminated on at least one surface of a polarizing film. An image display apparatus comprising the optical laminate according to claim 1 or 2 and at least one of a polarizing plate formed by laminating the optical laminate on at least one side of a polarizing film. Characterized in that an ionizing radiation curable resin composition A containing a polyalkylene glycol di (meth) acrylate in an amount of 50 to 100% by mass is applied on an acrylic base material, dried, and cured to form a primer layer Wherein the optical layered body is formed by a method comprising the steps of: 12. The method of claim 11,
Wherein the ionizing radiation curable resin composition A contains at least one selected from the group consisting of methyl isobutyl ketone, 1-butanol, propylene glycol monomethyl ether and isopropanol as a solvent, and the drying temperature is 40 to 90 ° C. &Lt; / RTI &gt; 13. The method according to claim 11 or 12,
Wherein an ionizing radiation curable resin composition (B) is further applied to a surface of the primer layer opposite to the acrylic base side, followed by drying and curing to form a functional layer.

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