WO2015046244A1

WO2015046244A1 - Optical laminate

Info

Publication number: WO2015046244A1
Application number: PCT/JP2014/075275
Authority: WO
Inventors: 周作柴田; 岸　敦史; 大介濱本; 浩貴倉本
Original assignee: 日東電工株式会社
Priority date: 2013-09-30
Filing date: 2014-09-24
Publication date: 2015-04-02
Also published as: TW201520587A; CN105593715B; KR102248947B1; CN105593715A; JP2015069008A; JP6235287B2; KR20160065103A; TWI551881B

Abstract

With respect to an optical laminate which is provided with a base layer, a hard coat layer and a permeation layer provided between the base layer and the hard coat layer and is additionally provided with an optical function layer on a surface of the hard coat layer, said surface not being provided with the permeation layer, a newly found problem of whitening is improved. An optical laminate which is provided with: a base layer that is formed of a thermoplastic resin film; a hard coat layer that is formed by applying a hard coat layer-forming composition to the thermoplastic resin film; a permeation layer that is formed between the base layer and the hard coat layer by permeation of the hard coat layer-forming composition into the thermoplastic resin film; and an optical function layer that is formed by applying an optical function layer-forming composition to the hard coat layer. The optical function layer contains a thermoplastic resin film-derived component dissolved from the thermoplastic resin film, and the thermoplastic resin film-derived component is present at a higher concentration in the inner portion of the optical function layer than in the surface thereof.

Description

Optical laminate

The present invention relates to an optical laminate.

Image display devices such as liquid crystal display (LCD), cathode ray tube display device (CRT), plasma display (PDP), electroluminescence display (ELD), etc. are visible when the surface is damaged by external contact. May decrease. For this reason, the optical laminated body containing a base material layer and a hard-coat layer is used for the purpose of the surface protection of an image display apparatus. As an optical laminated body of such a configuration, for example, a base layer composed of a (meth) acrylic resin film and a hard coat layer are provided, and a penetrating layer in which components forming each layer are compatibilized is provided between these layers. An optical layered body that suppresses unevenness of interference and improves adhesion (for example, Patent Document 1).

In general, an image display device is required to reduce surface reflection due to light emitted from the outside and to improve its visibility. On the other hand, surface reflection of an image display device is reduced and visibility is improved by using an optical laminate in which an antireflection layer is formed on a base material layer. Examples of the optical laminate having such a configuration include an optical laminate in which a low refractive index layer having a refractive index lower than that of the base material layer is provided on the outermost surface as the antireflection layer (for example, Patent Document 2).

JP 2012-234163 A JP 2010-85983 A

The present inventors have discovered that when an optical functional layer such as a low refractive index layer is further provided on the surface of the hard coat layer of the optical laminate having the above-mentioned penetration layer, the surface of the optical functional layer is whitened over time. Furthermore, when the cause of the whitening was examined, it was found that the component derived from the base film bleeds out to the surface of the optical functional layer through the permeation layer and the hard coat layer.

The present invention is newly discovered in an optical laminate comprising a base material layer, a hard coat layer, and a penetrating layer provided therebetween, and further comprising an optical functional layer on the side where the penetrating layer of the hard coat layer is not provided. It is to improve the above whitening problem.

The optical layered body of the present invention includes a base layer formed from a thermoplastic resin film, a hard coat layer formed by applying a hard coat layer forming composition to the thermoplastic resin film, and a base layer. Between the hard coat layer, the hard coat layer forming composition was formed by infiltrating the thermoplastic resin film, and the hard coat layer was formed by coating the optical functional layer forming composition. An optical functional layer. The optical functional layer includes a component derived from a thermoplastic resin film eluted from the thermoplastic resin film. The component derived from the thermoplastic resin film is present at a higher concentration inside than the surface of the optical functional layer.
In one embodiment, the thermoplastic resin film is a (meth) acrylic resin film.
In one embodiment, the component derived from the thermoplastic resin film contains a triazine ultraviolet absorber, a benzotriazole ultraviolet absorber, a benzophenone ultraviolet absorber, a cyanoacrylate ultraviolet absorber, a benzoxazine ultraviolet absorber, and an oxaxine. It is at least one ultraviolet absorber selected from diazole-based ultraviolet absorbers.
In one embodiment, the composition for forming an optical functional layer includes a curable compound, fine particles having a refractive index of 1.44 or less, and an antifouling agent.
In one embodiment, the antifouling agent is a fluorine-containing compound.
In one embodiment, the composition for forming a hard coat layer includes a curable compound having two or more (meth) acryloyl groups.
In one embodiment, the composition for forming a hard coat layer includes a monomer, an oligomer, and / or a prepolymer as a curable compound, and the total amount of the oligomer and the prepolymer is from 20% by weight to the total amount of the curable compound. 90% by weight.
According to another aspect of the present invention, a polarizing film is provided. This polarizing film contains the said optical laminated body.
According to still another aspect of the present invention, an image display device is provided. The image display device includes the optical laminate.

According to the optical layered body of the present invention, the component derived from the base film mixed up to the optical functional layer through the permeation layer and the hard coat layer is stably held inside the optical functional layer, thereby eliminating the problem of whitening. Can be improved.

(A) is a schematic sectional drawing of the optical laminated body by preferable embodiment of this invention, (b) is an example of the schematic sectional drawing of the optical laminated body which does not have a osmosis | permeation layer. It is the schematic explaining the precision diagonal cutting with respect to the optical laminated body of an Example or a comparative example. The portion indicated by the bold line in the figure corresponds to the measurement location. It is a graph which shows distribution of the component derived from the thermoplastic resin film in the low refractive index layer of the optical laminated body of an Example or a comparative example. The horizontal axis represents the measurement distance, and the vertical axis represents the ionic strength derived from the component. The higher the strength, the higher the concentration. In addition, the dotted line in a graph shows the ultraviolet absorber added to the thermoplastic resin film, and a continuous line shows the thermoplastic resin component containing a glutarimide unit.

Hereinafter, although preferable embodiment of this invention is described, this invention is not limited to these embodiment.
A. 1A is a schematic cross-sectional view of an optical laminate according to a preferred embodiment of the present invention, and FIG. 1B is a schematic cross-sectional view of an optical laminate having no osmotic layer. It is. The optical laminated body 100 shown to Fig.1 (a) is equipped with the base material layer 10 formed from a thermoplastic resin film, the osmosis | permeation layer 20, the hard-coat layer 30, and the optical function layer 40 in this order. The optical functional layer 40 is formed by coating the hard coat layer 30 with an optical functional layer forming composition. The hard coat layer 30 is formed by coating a composition for forming a hard coat layer on a thermoplastic resin film. The osmotic layer 20 is formed by osmosis | permeating the composition for hard-coat layer formation to a thermoplastic resin film. That is, the osmotic layer 20 is a portion where a hard coat layer component is present in the thermoplastic resin film. The base material layer 10 is a portion where the hard coat layer forming composition does not reach (penetrate) in the thermoplastic resin film when the hard coat layer forming composition penetrates into the thermoplastic resin film. . On the other hand, in the optical laminated body 200 shown in FIG. Boundary A shown in FIGS. 1A and 1B is a boundary defined by the hard coat layer forming composition coating surface of the thermoplastic resin film. Therefore, the boundary A is the boundary between the osmotic layer 20 and the hard coat layer 30 in the optical laminate 100, and the base layer 10 ′ (that is, the thermoplastic resin) in the optical laminate 200 in which the osmotic layer is not formed. Film) and the hard coat layer 30 '.

The optical laminate of the present invention is applied to, for example, a polarizing film (also referred to as a polarizing plate). Specifically, in the polarizing film, the optical laminate of the present invention is preferably provided on the viewing side of the polarizer and can be suitably used as a protective material for the polarizer.

B. Base material layer The base material layer is formed from any appropriate thermoplastic resin film. More specifically, when the hard coat layer forming composition is applied to the thermoplastic resin film, the hard coat layer forming composition does not reach (penetrate) in the thermoplastic resin film. Part.

Specific examples of the thermoplastic resin film include (meth) acrylic resin film, cellulose resin film such as triacetyl cellulose, polyolefin resin film such as polyethylene and polypropylene; cycloolefin resin film such as polynorbornene, polyethylene terephthalate And polyester-based resin films such as polybutylene terephthalate. Of these, a (meth) acrylic resin film is preferable. When the (meth) acrylic resin film is used as the base film, the penetration layer can be formed satisfactorily, but the film forming components tend to elute and the problem of whitening tends to occur. Can be obtained more suitably. In the present specification, “(meth) acryl” means acryl and / or methacryl.

The light transmittance of the thermoplastic resin film at a wavelength of 380 nm is preferably 15% or less, more preferably 12% or less, and further preferably 9% or less. If the transmittance of light having a wavelength of 380 nm is in such a range, an excellent ultraviolet absorbing ability is exhibited, so that deterioration of ultraviolet rays due to external light or the like of the optical laminate can be prevented.

The in-plane retardation Re of the thermoplastic resin film is preferably 10 nm or less, more preferably 7 nm or less, further preferably 5 nm or less, particularly preferably 3 nm or less, and most preferably 1 nm or less. is there. The thickness direction retardation Rth of the thermoplastic resin film is preferably 15 nm or less, more preferably 10 nm or less, further preferably 5 nm or less, particularly preferably 3 nm or less, and most preferably 1 nm or less. . If the in-plane retardation and the thickness direction retardation are within such ranges, the adverse effect on the display characteristics of the image display apparatus due to the phase difference can be remarkably suppressed. More specifically, interference unevenness and 3D image distortion when used in a liquid crystal display device for 3D display can be significantly suppressed. The in-plane retardation Re and the thickness direction retardation Rth can be obtained by the following equations, respectively:
Re = (nx−ny) × d
Rth = (nx−nz) × d
Here, nx is the refractive index in the slow axis direction of the thermoplastic resin film, ny is the refractive index in the fast axis direction of the thermoplastic resin film, and nz is the refractive index in the thickness direction of the thermoplastic resin film. Yes, d (nm) is the thickness of the thermoplastic resin film. The slow axis refers to the direction in which the in-plane refractive index is maximized, and the fast axis refers to the direction perpendicular to the slow axis in the plane. Typically, Re and Rth are measured using light having a wavelength of 590 nm.

The (meth) acrylic resin film includes a (meth) acrylic resin. The (meth) acrylic resin film is obtained, for example, by extruding a molding material containing a resin component containing a (meth) acrylic resin as a main component. As a specific example, a (meth) acrylic resin film having an in-plane retardation and a thickness direction retardation within the above ranges can be obtained using, for example, a (meth) acrylic resin having a glutarimide structure described later. .

The moisture permeability of the (meth) acrylic resin film is preferably 200 g / m ² · 24 hr or less, and more preferably 80 g / m ² · 24 hr or less. According to the present invention, even when a (meth) acrylic resin film having such a high moisture permeability is used, the adhesion between the (meth) acrylic resin film and the hard coat layer is excellent, and interference unevenness is suppressed. An optical laminate can be obtained. The moisture permeability can be measured under the test conditions of 40 ° C. and a relative humidity of 92%, for example, by a method according to JIS Z 0208.

Any appropriate (meth) acrylic resin can be adopted as the (meth) acrylic resin. For example, poly (meth) acrylate such as polymethyl methacrylate, methyl methacrylate- (meth) acrylic acid copolymer, methyl methacrylate- (meth) acrylic acid ester copolymer, methyl methacrylate-acrylic acid ester -(Meth) acrylic acid copolymer, (meth) acrylic acid methyl-styrene copolymer (MS resin, etc.), polymer having alicyclic hydrocarbon group (for example, methyl methacrylate-cyclohexyl methacrylate copolymer) And methyl methacrylate- (meth) acrylate norbornyl copolymer). Preferably, poly (meth) acrylate C _1-6 alkyl such as poly (meth) acrylate methyl is used. More preferred is a methyl methacrylate resin containing methyl methacrylate as a main component (50 to 100% by weight, preferably 70 to 100% by weight).

The weight average molecular weight of the (meth) acrylic resin is preferably 10,000 to 500,000. If the weight average molecular weight is too small, the mechanical strength when formed into a film tends to be insufficient. When the weight average molecular weight is too large, the viscosity at the time of melt extrusion is high, the molding processability is lowered, and the productivity of the molded product tends to be lowered.

The glass transition temperature of the (meth) acrylic resin is preferably 110 ° C. or higher, more preferably 120 ° C. or higher. When the glass transition temperature is in such a range, a (meth) acrylic resin film excellent in durability and heat resistance can be obtained. The upper limit of the glass transition temperature is not particularly limited, but is preferably 170 ° C. or less from the viewpoint of moldability and the like.

The (meth) acrylic resin preferably has a structural unit that exhibits positive birefringence and a structural unit that exhibits negative birefringence. If these structural units are included, the abundance ratio can be adjusted to control the retardation of the (meth) acrylic resin film, and a (meth) acrylic resin film having a low retardation can be obtained. it can. Examples of the structural unit exhibiting positive birefringence include a structural unit constituting a lactone ring, polycarbonate, polyvinyl alcohol, cellulose acetate, polyester, polyarylate, polyimide, polyolefin, etc., and a general formula (1) described later. Examples include structural units. Examples of the structural unit exhibiting negative birefringence include a structural unit derived from a styrene monomer, a maleimide monomer, a structural unit of polymethyl methacrylate, a structural unit represented by the general formula (3) described later, and the like. Can be mentioned. In the present specification, a structural unit that exhibits positive birefringence is a case where a resin having only the structural unit exhibits positive birefringence characteristics (that is, a slow axis appears in the stretching direction of the resin). Means a structural unit. In addition, a structural unit that develops negative birefringence is when a resin having only the structural unit exhibits negative birefringence characteristics (that is, when a slow axis appears in a direction perpendicular to the stretching direction of the resin). Means a structural unit of

As the (meth) acrylic resin, a (meth) acrylic resin having a lactone ring structure or a glutarimide structure is preferably used. A (meth) acrylic resin having a lactone ring structure or a glutarimide structure is excellent in heat resistance. More preferred is a (meth) acrylic resin having a glutarimide structure. If a (meth) acrylic resin having a glutarimide structure is used, a (meth) acrylic resin film having low moisture permeability and a small retardation and ultraviolet transmittance can be obtained as described above. Examples of (meth) acrylic resins having a glutarimide structure (hereinafter also referred to as glutarimide resins) include, for example, JP-A-2006-309033, JP-A-2006-317560, JP-A-2006-328329, and JP-A-2006-328329. JP-A-2006-328334, JP-A-2006-337491, JP-A-2006-337492, JP-A-2006-337493, JP-A-2006-337569, JP-A-2007-009182, JP-A-2009- No. 161744. These descriptions are incorporated herein by reference.

Preferably, the glutarimide resin includes a structural unit represented by the following general formula (1) (hereinafter also referred to as a glutarimide unit) and a structural unit represented by the following general formula (2) (hereinafter referred to as (meta)). Also referred to as an acrylate unit).

In the formula (1), R ¹ and R ² are each independently hydrogen or an alkyl group having 1 to 8 carbon atoms, and R ³ is hydrogen, an alkyl group having 1 to 18 carbon atoms, or 3 to 3 carbon atoms. 12 a cycloalkyl group or a substituent containing an aromatic ring having 5 to 15 carbon atoms. In the formula (2), R ⁴ and R ⁵ are each independently hydrogen or an alkyl group having 1 to 8 carbon atoms, and R ⁶ is hydrogen, an alkyl group having 1 to 18 carbon atoms, or 3 to 3 carbon atoms. 12 a cycloalkyl group or a substituent containing an aromatic ring having 5 to 15 carbon atoms.

The glutarimide resin may further contain a structural unit represented by the following general formula (3) (hereinafter also referred to as an aromatic vinyl unit) as necessary.

In the formula (3), R ⁷ is hydrogen or an alkyl group having 1 to 8 carbon atoms, and R ⁸ is an aryl group having 6 to 10 carbon atoms.

In the general formula (1), preferably, R ¹ and R ² are each independently hydrogen or a methyl group, R ³ is hydrogen, a methyl group, a butyl group, or a cyclohexyl group, and more preferably , R ¹ is a methyl group, R ² is hydrogen, and R ³ is a methyl group.

The glutarimide resin may include only a single type as a glutarimide unit, or may include a plurality of types in which R ¹ , R ² , and R ³ in the general formula (1) are different. Good.

The glutarimide unit can be formed by imidizing the (meth) acrylic acid ester unit represented by the general formula (2). The glutarimide unit may be an acid anhydride such as maleic anhydride, or a half ester of such an acid anhydride and a linear or branched alcohol having 1 to 20 carbon atoms; acrylic acid, methacrylic acid, maleic acid It can also be formed by imidizing an α, β-ethylenically unsaturated carboxylic acid such as maleic anhydride, itaconic acid, itaconic anhydride, crotonic acid, fumaric acid and citraconic acid.

In the general formula (2), preferably, R ⁴ and R ⁵ are each independently hydrogen or a methyl group, R ⁶ is hydrogen or a methyl group, and more preferably, R ⁴ is hydrogen. , R ⁵ is a methyl group, and R ⁶ is a methyl group.

The glutarimide resin may contain only a single type as a (meth) acrylic acid ester unit, or a plurality of types in which R ⁴ , R ⁵ and R ⁶ in the general formula (2) are different. May be included.

The glutarimide resin preferably contains styrene, α-methylstyrene, and more preferably styrene as the aromatic vinyl unit represented by the general formula (3). By having such an aromatic vinyl unit, the positive birefringence of the glutarimide structure can be reduced, and a (meth) acrylic resin film having a lower retardation can be obtained.

The glutarimide resin may contain only a single type as an aromatic vinyl unit, or may contain a plurality of types in which R ⁷ and R ⁸ are different.

The content of the glutarimide unit in the glutarimide resin is preferably changed depending on, for example, the structure of R ³ . The content of the glutarimide unit is preferably 1% by weight to 80% by weight, more preferably 1% by weight to 70% by weight, even more preferably 1% by weight, based on the total structural unit of the glutarimide resin. -60% by weight, particularly preferably 1-50% by weight. When the content of the glutarimide unit is in such a range, a (meth) acrylic resin film having a low retardation excellent in heat resistance can be obtained.

The content of the aromatic vinyl unit in the glutarimide resin can be appropriately set according to the purpose and desired characteristics. Depending on the application, the content of the aromatic vinyl unit may be zero. When the aromatic vinyl unit is contained, the content thereof is preferably 10% by weight to 80% by weight, more preferably 20% by weight to 80% by weight, based on the glutarimide unit of the glutarimide resin. More preferably, it is 20% by weight to 60% by weight, and particularly preferably 20% by weight to 50% by weight. When the content of the aromatic vinyl unit is within such a range, a (meth) acrylic resin film having a low retardation, excellent heat resistance and mechanical strength can be obtained.

The glutarimide resin may be further copolymerized with other structural units other than the glutarimide unit, the (meth) acrylic acid ester unit, and the aromatic vinyl unit, if necessary. Examples of other structural units include structures composed of nitrile monomers such as acrylonitrile and methacrylonitrile, and maleimide monomers such as maleimide, N-methylmaleimide, N-phenylmaleimide, and N-cyclohexylmaleimide. Units are listed. These other structural units may be directly copolymerized or graft copolymerized in the glutarimide resin.

The thermoplastic resin film contains an ultraviolet absorber. As the ultraviolet absorber, any appropriate ultraviolet absorber can be adopted as long as the desired characteristics are obtained. Representative examples of the above UV absorbers include triazine UV absorbers, benzotriazole UV absorbers, benzophenone UV absorbers, cyanoacrylate UV absorbers, benzoxazine UV absorbers, and oxadiazole UV absorbers. Agents. These ultraviolet absorbers may be used alone or in combination.

The content of the ultraviolet absorber is preferably 0.1 to 5 parts by weight, more preferably 0.2 to 3 parts by weight with respect to 100 parts by weight of the thermoplastic resin. When the content of the ultraviolet absorber is in such a range, ultraviolet rays can be absorbed effectively and the transparency of the film during film formation does not deteriorate. When the content of the ultraviolet absorber is less than 0.1 parts by weight, the ultraviolet blocking effect tends to be insufficient. When there is more content of a ultraviolet absorber than 5 weight part, there exists a tendency for coloring to become intense or the haze of the film after shaping | molding becomes high, and transparency deteriorates.

The thermoplastic resin film may contain any appropriate additive depending on the purpose. Examples of additives include hindered phenol-based, phosphorus-based and sulfur-based antioxidants; light-resistant stabilizers, weather-resistant stabilizers, heat stabilizers and other stabilizers; reinforcing materials such as glass fibers and carbon fibers; Infrared absorbers; flame retardants such as tris (dibromopropyl) phosphate, triallyl phosphate, antimony oxide; antistatic agents such as anionic, cationic and nonionic surfactants; coloring of inorganic pigments, organic pigments, dyes, etc. Agents; organic fillers and inorganic fillers; resin modifiers; plasticizers; lubricants; retardation reducing agents. The kind, combination, content, and the like of the additive to be contained can be appropriately set according to the purpose and desired characteristics.

The method for producing the thermoplastic resin film is not particularly limited. For example, the thermoplastic resin, the ultraviolet absorber, and other polymers and additives as necessary may be arbitrarily selected. It is possible to form a film from a thermoplastic resin composition that has been sufficiently mixed by an appropriate mixing method. Alternatively, a thermoplastic resin, an ultraviolet absorber, and if necessary, other polymers and additives are mixed in separate solutions to form a uniform mixed solution, and then formed into a film. Good.

In order to produce the thermoplastic resin composition, for example, the film raw material is pre-blended with any suitable mixer such as an omni mixer, and then the obtained mixture is extruded and kneaded. In this case, the mixer used for extrusion kneading is not particularly limited, and for example, any suitable mixer such as an extruder such as a single screw extruder or a twin screw extruder or a pressure kneader may be used. Can do.

Examples of the film forming method include any appropriate film forming methods such as a solution casting method (solution casting method), a melt extrusion method, a calendar method, and a compression molding method. A melt extrusion method is preferred. Since the melt extrusion method does not use a solvent, it is possible to reduce the manufacturing cost and the burden on the global environment and work environment due to the solvent.

Examples of the melt extrusion method include a T-die method and an inflation method. The molding temperature is preferably 150 to 350 ° C, more preferably 200 to 300 ° C.

When film-forming by the above T-die method, a T-die is attached to the tip of a known single-screw extruder or twin-screw extruder, and the film extruded into a film is wound to obtain a roll-shaped film Can do. At this time, it is possible to perform uniaxial stretching by appropriately adjusting the temperature of the winding roll and adding stretching in the extrusion direction. Also, simultaneous biaxial stretching, sequential biaxial stretching, and the like can be performed by stretching the film in a direction perpendicular to the extrusion direction.

The thermoplastic resin film may be either an unstretched film or a stretched film as long as the desired retardation is obtained. In the case of a stretched film, either a uniaxially stretched film or a biaxially stretched film may be used. In the case of a biaxially stretched film, either a simultaneous biaxially stretched film or a sequential biaxially stretched film may be used.

The stretching temperature is preferably in the vicinity of the glass transition temperature of the thermoplastic resin composition which is a film raw material, and more preferably, (glass transition temperature−30 ° C.) to (glass transition temperature + 30 ° C.) Preferably, it is within the range of (glass transition temperature−20 ° C.) to (glass transition temperature + 20 ° C.). If the stretching temperature is less than (glass transition temperature −30 ° C.), the haze of the resulting film may increase, or the film may be torn or cracked, resulting in failure to obtain a predetermined stretching ratio. On the other hand, when the stretching temperature exceeds (glass transition temperature + 30 ° C.), the thickness unevenness of the resulting film becomes large, and the mechanical properties such as elongation, tear propagation strength, and fatigue resistance cannot be sufficiently improved. There is a tendency to. Furthermore, there is a tendency that troubles such as the film sticking to the roll tend to occur.

The stretching ratio is preferably 1.1 to 3 times, more preferably 1.3 to 2.5 times. When the draw ratio is in such a range, the mechanical properties such as the film elongation, tear propagation strength, and fatigue resistance can be greatly improved. As a result, it is possible to produce a film with small thickness unevenness, substantially zero birefringence (and therefore a small phase difference), and a small haze.

The thermoplastic resin film can be subjected to a heat treatment (annealing) or the like after the stretching treatment in order to stabilize its optical isotropy and mechanical properties. Arbitrary appropriate conditions can be employ | adopted for the conditions of heat processing.

The thickness of the thermoplastic resin film is preferably 10 μm to 200 μm, more preferably 20 μm to 100 μm. There exists a possibility that intensity | strength may fall that thickness is less than 10 micrometers. If the thickness exceeds 200 μm, the transparency may decrease.

The surface tension of the thermoplastic resin film is preferably 40 mN / m or more, more preferably 50 mN / m or more, and further preferably 55 mN / m or more. When the surface wetting tension is 40 mN / m or more, the adhesion between the thermoplastic resin film and the hard coat layer is further improved. Any suitable surface treatment can be applied to adjust the surface wetting tension. Examples of the surface treatment include corona discharge treatment, plasma treatment, ozone spraying, ultraviolet irradiation, flame treatment, and chemical treatment. Of these, corona discharge treatment and plasma treatment are preferable.

C. Penetration layer The penetration layer is formed by the penetration of the composition for forming a hard coat layer into the thermoplastic resin film as described above. In other words, the osmotic layer can correspond to a part of the compatibilized region between the thermoplastic resin forming the thermoplastic resin film and the component forming the hard coat layer.

In the penetration layer, it is preferable that the concentration of the thermoplastic resin forming the thermoplastic resin film is continuously increased from the hard coat layer side to the base material layer side. Interfacial reflection can be suppressed by the fact that the concentration of the thermoplastic resin changes continuously, that is, the interface resulting from the change in the concentration of the thermoplastic resin is not formed, and an optical laminate having little interference unevenness is obtained. Because you can.

The lower limit of the thickness of the permeation layer is, for example, 1.2 μm, preferably 1.5 μm, more preferably 2.5 μm, and further preferably 3 μm. The upper limit of the thickness of the osmotic layer is preferably (thermoplastic resin film thickness × 70%) μm, more preferably (thermoplastic resin film thickness × 40%) μm, and even more preferably (thermoplastic resin). Film thickness × 30%) μm, particularly preferably (thermoplastic resin film × 20%) μm. If the thickness of the permeation layer is in such a range, an optical laminate having excellent adhesion between the thermoplastic resin film and the hard coat layer and suppressing interference unevenness can be obtained. The thickness of the osmotic layer is the thickness of the portion where the component for forming the hard coat layer is present in the thermoplastic resin film. With reference to FIG. 1, the formation of the hard coat layer in the thermoplastic resin film is described. The distance between the boundary A and the boundary A between the portion where the component is present (penetrating layer) and the portion where the component is not present (base material layer). The thickness of the osmotic layer can be measured by reflection spectrum of the hard coat layer or observation with an electron microscope such as SEM or TEM. Details of the method for measuring the thickness of the osmotic layer based on the reflection spectrum will be described later as an evaluation method in Examples.

In one embodiment, the optical layered body of the present invention having the osmotic layer having a thickness within the above range may cause interference unevenness even when a material having a large refractive index difference is selected as a material for forming the thermoplastic resin film and the hard coat layer. Can be prevented. For example, the absolute value of the difference between the refractive index of the base material layer and the refractive index of the hard coat layer can be set to 0.01 to 0.15. Of course, it is also possible to set the absolute value of the difference in refractive index to less than 0.01.

D. Hard coat layer As described above, the hard coat layer is formed by applying the composition for forming a hard coat layer on the thermoplastic resin film. The composition for forming a hard coat layer includes, for example, a curable compound that can be cured by heat, light (such as ultraviolet rays), or an electron beam. Preferably, the composition for forming a hard coat layer contains a photocurable curable compound. The curable compound may be any of a monomer, an oligomer and a prepolymer.

The hard coat layer forming composition preferably contains a curable compound having two or more (meth) acryloyl groups. The upper limit of the number of (meth) acryloyl groups contained in the curable compound having two or more (meth) acryloyl groups is preferably 100. Since a curable compound having two or more (meth) acryloyl groups is excellent in compatibility with a (meth) acrylic resin, when a (meth) acrylic resin film is used as a thermoplastic resin film, It easily penetrates and diffuses into the (meth) acrylic resin film. In the present specification, “(meth) acryloyl” means methacryloyl and / or acryloyl.

Examples of the curable compound having two or more (meth) acryloyl groups include tricyclodecane dimethanol diacrylate, pentaerythritol di (meth) acrylate, pentaerythritol tri (meth) acrylate, trimethylolpropane triacrylate, Pentaerythritol tetra (meth) acrylate, dimethylolpropanthate tetraacrylate, dipentaerythritol hexa (meth) acrylate, 1,6-hexanediol (meth) acrylate, 1,9-nonanediol diacrylate, 1,10-decanediol (Meth) acrylate, polyethylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, dipropylene glycol diacrylate, isocyanuric acid Examples include li (meth) acrylate, ethoxylated glycerin triacrylate, ethoxylated pentaerythritol tetraacrylate, and oligomers or prepolymers thereof. The curable compound having two or more (meth) acryloyl groups may be used alone or in combination. In the present specification, “(meth) acrylate” means acrylate and / or methacrylate.

The curable compound having two or more (meth) acryloyl groups preferably has a hydroxyl group. If the composition for forming a hard coat layer contains such a curable compound, the heating temperature at the time of forming the hard coat layer can be set lower, the heating time can be set shorter, and deformation due to heating can be suppressed. The produced optical laminate can be produced efficiently. Moreover, the optical laminated body excellent in the adhesiveness of a thermoplastic resin film (for example, (meth) acrylic-type resin film) and a hard-coat layer can be obtained. Examples of the curable compound having a hydroxyl group and two or more (meth) acryloyl groups include pentaerythritol tri (meth) acrylate and dipentaerythritol pentaacrylate.

The content of the curable compound having two or more (meth) acryloyl groups is preferably 30% by weight to 100% by weight with respect to the total amount of the monomer, oligomer and prepolymer in the hard coat layer forming composition. %, More preferably 40% by weight to 95% by weight, and particularly preferably 50% by weight to 95% by weight. If it is such a range, the optical laminated body which was excellent in the adhesiveness of a thermoplastic resin film (for example, (meth) acrylic-type resin film) and a hard-coat layer, and the interference nonuniformity was suppressed can be obtained. . In addition, curing shrinkage of the hard coat layer can be effectively prevented.

The hard coat layer forming composition may contain a monofunctional monomer as a curable compound. A monofunctional monomer easily penetrates into a thermoplastic resin film (for example, a (meth) acrylic resin film). Therefore, if the monofunctional monomer is contained, the adhesion between the thermoplastic resin film and the hard coat layer is excellent. And the optical laminated body by which interference nonuniformity was suppressed can be obtained. Further, if the hard coat layer-forming composition contains a monofunctional monomer, the heating temperature at the time of forming the hard coat layer can be set low, the heating time can be set short, and the optical laminate in which deformation due to heating is suppressed. Can be produced efficiently. When the hard coat layer forming composition contains a monofunctional monomer, the content ratio of the monofunctional monomer is preferably 40% by weight or less with respect to the total curable compound in the hard coat layer forming composition, More preferably, it is 30 weight% or less, Most preferably, it is 20 weight% or less. When the content ratio of the monofunctional monomer is more than 40% by weight, desired hardness and scratch resistance may not be obtained.

The weight average molecular weight of the monofunctional monomer is preferably 500 or less. Such a monofunctional monomer easily penetrates and diffuses into a thermoplastic resin film (for example, a (meth) acrylic resin film). Examples of such monofunctional monomers include ethoxylated o-phenylphenol (meth) acrylate, methoxypolyethylene glycol (meth) acrylate, phenoxypolyethylene glycol (meth) acrylate, 2-ethylhexyl acrylate, lauryl acrylate, isooctyl acrylate, Isostearyl acrylate, cyclohexyl acrylate, isoholonyl acrylate, phenoxyethyl acrylate, benzyl acrylate, 2-hydroxy-3-phenoxy acrylate, acryloylmorpholine, 2-hydroxyethyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, dimethyl Aminopropylacrylamide, N- (2-hydroxyethyl) (meth) acrylamide, etc. That.

The monofunctional monomer preferably has a hydroxyl group. With such a monofunctional monomer, the heating temperature at the time of forming the hard coat layer can be set lower, the heating time can be set shorter, and an optical laminate in which deformation due to heating is suppressed can be efficiently produced. it can. Moreover, if the said composition for hard-coat layer formation contains the monofunctional monomer which has a hydroxyl group, the optical which is excellent in the adhesiveness of a thermoplastic resin film (for example, (meth) acrylic-type resin film) and a hard-coat layer. A laminate can be obtained. Examples of such monofunctional monomers include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 2-hydroxy-3-phenoxy acrylate, 1,4 -Hydroxyalkyl (meth) acrylates such as cyclohexane methanol monoacrylate; N- (2-hydroxyalkyl) (meth) acrylamides such as N- (2-hydroxyethyl) (meth) acrylamide, N-methylol (meth) acrylamide, etc. Can be mentioned. Of these, 4-hydroxybutyl acrylate and N- (2-hydroxyethyl) acrylamide are preferable.

The boiling point of the monofunctional monomer is preferably higher than the heating temperature (described later) of the coating layer when forming the hard coat layer. The boiling point of the monofunctional monomer is, for example, preferably 150 ° C. or higher, more preferably 180 ° C. or higher, and particularly preferably 200 ° C. or higher. Within such a range, the monofunctional monomer can be prevented from volatilizing by heating during the formation of the hard coat layer, and the monofunctional monomer can sufficiently penetrate into the thermoplastic resin film (for example, (meth) acrylic resin film). Can be made.

The composition for forming a hard coat layer preferably contains urethane (meth) acrylate and / or urethane (meth) acrylate oligomer as the curable compound. If the hard coat layer-forming composition contains urethane (meth) acrylate and / or urethane (meth) acrylate oligomer, a hard coat layer having excellent flexibility and adhesion to a thermoplastic resin film can be formed. . The urethane (meth) acrylate can be obtained, for example, by reacting hydroxy (meth) acrylate obtained from (meth) acrylic acid or (meth) acrylic acid ester and polyol with diisocyanate. Urethane (meth) acrylates and urethane (meth) acrylate oligomers may be used alone or in combination.

Examples of the (meth) acrylic acid ester include methyl (meth) acrylate, ethyl (meth) acrylate, isopropyl (meth) acrylate, butyl (meth) acrylate, cyclohexyl (meth) acrylate, and the like.

Examples of the polyol include ethylene glycol, 1,3-propylene glycol, 1,2-propylene glycol, diethylene glycol, dipropylene glycol, neopentyl glycol, 1,3-butanediol, 1,4-butanediol, 1, 6-hexanediol, 1,9-nonanediol, 1,10-decanediol, 2,2,4-trimethyl-1,3-pentanediol, 3-methyl-1,5-pentanediol, neopentyl hydroxypivalate Glycol ester, tricyclodecane dimethylol, 1,4-cyclohexanediol, spiroglycol, hydrogenated bisphenol A, ethylene oxide added bisphenol A, propylene oxide added bisphenol A, trimethylol ethane, trimethylol Propane, glycerin, 3-methylpentane-1,3,5-triol, pentaerythritol, dipentaerythritol, tripentaerythritol, glucose, etc. can be mentioned.

As the diisocyanate, for example, various aromatic, aliphatic or alicyclic diisocyanates can be used. Specific examples of the diisocyanate include tetramethylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, 2,4-tolylene diisocyanate, 4,4-diphenyl diisocyanate, 1,5-naphthalene diisocyanate, 3,3-dimethyl-4,4. -Diphenyl diisocyanate, xylene diisocyanate, trimethylhexamethylene diisocyanate, 4,4-diphenylmethane diisocyanate, and hydrogenated products thereof.

The total content of the urethane (meth) acrylate and urethane (meth) acrylate oligomer is preferably 20% by weight to 90% by weight with respect to the total amount of the monomer, oligomer and prepolymer in the composition for forming a hard coat layer. %, More preferably 25% by weight to 85% by weight, and particularly preferably 30% by weight to 80% by weight. If it is such a range, the hard-coat layer excellent in the balance of hardness, a softness | flexibility, and adhesiveness can be formed.

The hard coat layer forming composition may contain a (meth) acrylic prepolymer having a hydroxyl group. If the composition for forming a hard coat layer contains a (meth) acrylic prepolymer having a hydroxyl group, curing shrinkage can be reduced. Moreover, when the (meth) acrylic prepolymer has a hydroxyl group, an optical laminate having excellent adhesion between a thermoplastic resin film (for example, a (meth) acrylic resin film) and a hard coat layer is obtained. be able to. The (meth) acrylic prepolymer having a hydroxyl group is preferably a polymer polymerized from a hydroxyalkyl (meth) acrylate having a linear or branched alkyl group having 1 to 10 carbon atoms. Examples of the (meth) acrylic prepolymer having a hydroxyl group include 2-hydroxyethyl (meth) acrylate, 2,3-dihydroxypropyl (meth) acrylate, 2-hydroxy-3-acryloyloxypropyl (meth) acrylate, 2 -Polymers polymerized from at least one monomer selected from the group consisting of acryloyloxy-3-hydroxypropyl (meth) acrylate. The (meth) acrylic prepolymer having a hydroxyl group may be used alone or in combination.

The content ratio of the (meth) acrylic prepolymer having a hydroxyl group is preferably 5% by weight to 50% by weight with respect to the total amount of the monomer, oligomer and prepolymer in the hard coat layer forming composition. More preferably, it is 10 to 30% by weight. If it is such a range, the composition for hard-coat layer formation excellent in coating property will be obtained. In addition, curing shrinkage of the formed hard coat layer can be effectively prevented.

When the composition for forming a hard coat layer contains a monomer and an oligomer and / or a prepolymer as the curable compound, the sum of the oligomer and the prepolymer relative to the total amount of the curable compound (the total amount of the monomer, the oligomer and the prepolymer) The amount is preferably 20% to 90% by weight, more preferably 25% to 85% by weight, and still more preferably 30% to 80% by weight. When the monomer compounding ratio in the curable compound increases, the bleed-out amount of the component derived from the thermoplastic resin film tends to increase. Moreover, there exists a possibility that adhesiveness may worsen when the monomer compounding ratio in a curable compound becomes small.

The hard coat layer forming composition preferably contains any appropriate photopolymerization initiator. Examples of the photopolymerization initiator include 2,2-dimethoxy-2-phenylacetophenone, acetophenone, benzophenone, xanthone, 3-methylacetophenone, 4-chlorobenzophenone, 4,4′-dimethoxybenzophenone, benzoinpropyl ether, benzyldimethyl Ketals, N, N, N ′, N′-tetramethyl-4,4′-diaminobenzophenone, 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropan-1-one, thioxanthone compounds, etc. Can be mentioned.

In one embodiment, the surface of the hard coat layer opposite to the base material layer has an uneven structure. If the surface of the hard coat layer has a concavo-convex structure, antiglare properties can be imparted to the optical laminate. Examples of a method for forming such a concavo-convex structure include a method in which fine particles are contained in the hard coat layer forming composition. The fine particles may be inorganic fine particles or organic fine particles. Examples of the inorganic fine particles include silicon oxide fine particles, titanium oxide fine particles, aluminum oxide fine particles, zinc oxide fine particles, tin oxide fine particles, calcium carbonate fine particles, barium sulfate fine particles, talc fine particles, kaolin fine particles, and calcium sulfate fine particles. Examples of the organic fine particles include polymethyl methacrylate resin powder (PMMA fine particles), silicone resin powder, polystyrene resin powder, polycarbonate resin powder, acrylic styrene resin powder, benzoguanamine resin powder, melamine resin powder, polyolefin resin powder, and polyester resin powder. , Polyamide resin powder, polyimide resin powder, polyfluorinated ethylene resin powder, and the like. These fine particles may be used alone or in combination.

Any appropriate shape can be adopted as the shape of the fine particles. It is preferably a substantially spherical shape, more preferably a substantially spherical shape having an aspect ratio of 1.5 or less. The weight average particle diameter of the fine particles is preferably 1 μm to 30 μm, more preferably 2 μm to 20 μm. The weight average particle diameter of the fine particles can be measured by, for example, a Coulter count method.

When the hard coat layer forming composition contains the fine particles, the content ratio of the fine particles is preferably 1% by weight to the total amount of the monomer, oligomer and prepolymer in the hard coat layer forming composition. 60% by weight, more preferably 2% to 50% by weight.

The hard coat layer forming composition may further contain any appropriate additive. Examples of additives include leveling agents, anti-blocking agents, dispersion stabilizers, thixotropic agents, antioxidants, UV absorbers, antifoaming agents, thickeners, dispersants, surfactants, catalysts, fillers, and lubricants. And antistatic agents.

The hard coat layer forming composition may or may not contain a solvent. Examples of the solvent include dibutyl ether, dimethoxymethane, dimethoxyethane, diethoxyethane, propylene oxide, 1,4-dioxane, 1,3-dioxolane, 1,3,5-trioxane, tetrahydrofuran, acetone, methyl ethyl ketone (MEK). , Diethyl ketone, dipropyl ketone, diisobutyl ketone, cyclopentanone (CPN), cyclohexanone, methylcyclohexanone, ethyl formate, propyl formate, n-pentyl formate, methyl acetate, ethyl acetate, methyl propionate, ethyl propionate, n acetate -Pentyl, acetylacetone, diacetone alcohol, methyl acetoacetate, ethyl acetoacetate, methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, 1-pen Nord, 2-methyl-2-butanol, cyclohexanol, isopropyl alcohol (IPA), isobutyl acetate, methyl isobutyl ketone (MIBK), 2-octanone, 2-pentanone, 2-hexanone, 2-heptanone, 3-heptanone, ethylene Examples include glycol monoethyl ether acetate, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, ethylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, and propylene glycol monomethyl ether. These may be used alone or in combination.

According to the present invention, a hard coat layer forming composition containing no solvent or a hard coat layer forming composition containing only a poor solvent of a thermoplastic resin film forming material as a solvent can be used. The composition can permeate a thermoplastic resin film, preferably a (meth) acrylic resin film, to form a permeation layer having a desired thickness.

The thickness of the hard coat layer is preferably 1 μm to 20 μm, more preferably 3 μm to 10 μm.

In the hard coat layer, a thermoplastic resin eluted from the thermoplastic resin film into the hard coat layer forming composition may be present. When a thermoplastic resin that forms a thermoplastic resin film is present in the hard coat layer, the concentration of the thermoplastic resin is preferably continuously reduced from the penetrating layer side surface toward the optical functional layer side surface. In such an embodiment, since the concentration of the thermoplastic resin continuously changes, that is, the interface due to the change in the concentration of the thermoplastic resin is not formed, the interface reflection can be suppressed, and the interference unevenness is reduced. It is possible to obtain an optical layered body with less.

E. Optical Functional Layer The optical functional layer is formed by applying the optical functional layer forming composition to the hard coat layer. The optical functional layer contains a component derived from a thermoplastic resin film that is eluted from the thermoplastic resin film into the composition for forming a hard coat layer and mixed through the hard coat layer. The component derived from the thermoplastic resin film is present in the optical functional layer at a higher concentration inside than on the surface thereof. The concentration distribution of the component derived from the thermoplastic resin film in the optical functional layer is measured by using a time-of-flight secondary ion mass spectrometer (TOF-SIMS), for example, as described in the examples. Can be determined by detecting elemental and molecular information present in In this case, in the measurement region, when the average concentration of the component in the oblique cutting section of the optical functional layer is higher than the average concentration on the surface, the component is present at a higher concentration inside than the surface of the optical functional layer. Judge that.

Examples of the component derived from the thermoplastic resin film mixed in the optical functional layer include additives added to the film, low molecular weight thermoplastic resins, and the like. Of these, UV absorption selected from triazine UV absorbers, benzotriazole UV absorbers, benzophenone UV absorbers, cyanoacrylate UV absorbers, benzoxazine UV absorbers, and oxadiazole UV absorbers. The agent has a high transferability to the hard coat layer forming composition and easily causes whitening problems. In the present invention, the problem of whitening can be improved by stably holding the components derived from the thermoplastic resin film that can cause whitening inside the optical functional layer. In one embodiment, the optical layered body of the present invention is substantially free from whitening problems even after two weeks have passed since manufacture.

The optical functional layer is preferably antifouling because it can be disposed on the outermost surface of the display screen of the image display device. The water contact angle of the optical functional layer is, for example, 90 ° or more, preferably 95 ° or more, more preferably 100 ° or more, and further preferably 105 ° or more. Further, the hexadecane contact angle of the optical functional layer is preferably 35 ° or more, more preferably 40 ° or more, and further preferably 45 ° or more.

Specific examples of the optical functional layer include a low refractive index layer, a high refractive index layer, an antiglare layer, and an antistatic layer. When the optical functional layer is a low refractive index layer, the low refractive index layer can function as an antireflection layer.

The refractive index of the low refractive index layer is lower than the refractive index of the hard coat layer. The refractive index of the low refractive index layer is preferably 1.20 to 1.45, more preferably 1.23 to 1.42. Further, the difference between the refractive index of the low refractive index layer and the refractive index of the hard coat layer may be, for example, 0.08 to 0.33. In the present specification, the refractive index means a refractive index at a wavelength of 590 nm.

The optical functional layer forming composition typically includes a curable compound and an antifouling agent. When the optical functional layer is a low refractive index layer, the optical functional layer forming composition (low refractive index layer forming composition) further includes low refractive index fine particles having a refractive index of 1.44 or less. The curable compound can be cured by, for example, heat, light (such as ultraviolet rays), or an electron beam. Preferably, the composition for forming an optical functional layer contains a photocurable curable compound. The curable compound may be any of a monomer, an oligomer and a prepolymer.

The composition for forming an optical functional layer preferably contains a curable compound having two or more (meth) acryloyl groups. When both the hard coat layer forming composition and the optical functional layer forming composition have two or more (meth) acryloyl groups, the adhesion between the hard coat layer and the optical functional layer can be improved. As the curable compound having two or more (meth) acryloyl groups, the same compounds as those described in the section D for the composition for forming a hard coat layer can be used alone or in combination of two or more.

The curable compound having two or more (meth) acryloyl groups preferably has a hydroxyl group. If the composition for optical function layer formation contains such a sclerosing | hardenable compound, the optical laminated body excellent in the adhesiveness of a hard-coat layer and an optical function layer can be obtained.

The content ratio of the curable compound having two or more (meth) acryloyl groups is preferably 50% by weight to 100% by weight with respect to the total amount of the monomer, oligomer and prepolymer in the composition for forming an optical functional layer. %, More preferably 60% by weight to 100% by weight, and particularly preferably 70% by weight to 100% by weight. If it is such a range, the optical laminated body excellent in the adhesiveness of a hard-coat layer and an optical function layer can be obtained. In addition, curing shrinkage of the optical functional layer can be effectively prevented.

Examples of other monomers, oligomers and prepolymers that can be contained in the composition for forming an optical functional layer include those described in the section D for the composition for forming a hard coat layer.

In the present invention, a fluorine-containing compound can be preferably used as the antifouling agent. The fluorine-containing compound imparts antifouling properties to the optical functional layer and can also contribute to lowering the refractive index of the optical functional layer. In general, in the outermost surface layer of an image display device, a silicone-based antifouling agent is used to impart antifouling properties as well as scratch resistance and the like. In the present invention, a fluorine-based antifouling agent is used. By using this, the component derived from the thermoplastic resin film can be stably held inside the optical functional layer. The fluorine-containing compound used in the present invention may not contain silicon, for example, it does not contain a siloxane bond.

The fluorine-containing compound preferably has a fluoroalkyl group, a fluoroalkenyl group or a fluoroalkylene group each having 1 to 10 carbon atoms in the molecule, more preferably a perfluoroalkyl group or a perfluoroalkenyl group each having 1 to 10 carbon atoms. Group or perfluoroalkylene group. According to the fluorine-containing compound having these groups, bleeding out of the component derived from the thermoplastic resin film can be suppressed and stably held inside the optical functional layer.

The fluorine-containing compound may further have an ether bond. The number of ether bonds is preferably 1 or more, more preferably 2 to 30, and particularly preferably 4 to 20. If the number of ether bonds is within such a range, excellent antifouling properties can be obtained.

In one embodiment, the fluorine-containing compound comprises a perfluoroalkyl group such as a trifluoromethyl group, a tetrafluoroethylene group, a perfluoroisopropyl group, and / or a perfluoroalkenyl group such as a heptadecafluorononenyl group and an ether bond. Can have.

In another embodiment, the fluorine-containing compound may have a perfluoroalkylene oxide group such as a tetrafluoroethylene oxide group or a difluoromethylene oxide group. In this embodiment, the fluorine-containing compound is, for example, poly (perfluoroalkylene oxide) such as poly (difluoromethylene oxide), poly (tetrafluoroethylene oxide), poly (tetrafluoroethylene oxide-co-difluoromethylene oxide), etc. It can be.

The fluorine-containing compound may further have any appropriate reactive group as required. The reactive group is typically a (meth) acryloyl group. When having a reactive group, the fluorine-containing compound is fixed in the optical functional layer, and movement in the layer can be restricted. As a result, contact between the fluorine-containing compound and the component derived from the thermoplastic resin film is reduced, and aggregation and precipitation of the component derived from the thermoplastic resin film due to the contact can be suppressed.

The weight average molecular weight of the fluorine-containing compound is preferably relatively small or relatively large. Specifically, the weight average molecular weight is preferably 300 to 8,000 or 50,000 or more, more preferably 500 to 5,000 or 100,000 to 500,000. In the case of a fluorine-containing compound having a relatively small molecular weight, it is excellent in transferability to the surface, so that a thin layer of the compound can be suitably formed on the surface of the optical functional layer, thereby bleeding the component derived from the thermoplastic resin film. It is presumed that out can be suppressed. On the other hand, in the case of a fluorine-containing compound having a relatively large molecular weight, it is assumed that bleeding out of the component can be suitably suppressed by compatibilizing or stably dispersing the component derived from the thermoplastic resin film inside the optical functional layer. Is done.

The compounding amount of the fluorine-containing compound is preferably 0.5% by weight to 30% by weight, more preferably 1% by weight to 25% by weight, based on the total solid content in the composition for forming an optical functional layer. More preferably, it is 1.5 wt% to 20 wt%.

The optical functional layer forming composition preferably contains any appropriate photopolymerization initiator. Further, it may further contain a solvent and any appropriate additive as required. Specific examples of the photopolymerization initiator, the solvent and the additive include the same ones that can be used for the composition for forming a hard coat layer.

Any appropriate fine particles may be used as the low refractive index fine particles. The refractive index of the low refractive index fine particles is preferably 1.20 to 1.44, more preferably 1.23 to 1.40. Examples of the low refractive index fine particles include fine particles having voids or fine particles formed of a low refractive index material.

Examples of the fine particles having voids include hollow fine particles and porous fine particles. Examples of the material for forming fine particles having voids include metals, metal oxides, and resins. Among these, hollow silica fine particles can be preferably used. In the hollow silica fine particles, a lipophilic group or a reactive group may be introduced on the surface using a silane coupling agent.

The material for forming the fine particles formed of the low refractive index material is not limited as long as the refractive index is satisfied, and examples thereof include metal fluorides such as magnesium fluoride, aluminum fluoride, calcium fluoride, and lithium fluoride. It is done.

The average particle size (average primary particle size) of the low refractive index fine particles is, for example, 1 nm to 100 nm. If the average particle size is within the range, both transparency and dispersibility can be achieved.

For details of the low refractive index fine particles, descriptions in WO2008 / 038714, WO2009 / 025292, etc. can be referred to.

The blending amount of the low refractive index fine particles is preferably 30% by weight to 250% by weight and more preferably 45% by weight to 200% by weight with respect to the total amount of the curable compound (total amount of monomer, oligomer and prepolymer). %, More preferably 60% to 150% by weight.

The thickness of the optical functional layer can be set to any appropriate value depending on the purpose and the like. When the optical functional layer is a low refractive index layer, the thickness thereof is, for example, 10 nm to 200 nm, preferably 20 nm to 120 nm.

F. Manufacturing method of optical laminated body The manufacturing method of the optical laminated body of this invention apply | coats the composition for hard-coat layer formation on a thermoplastic resin film, forms a 1st coating layer, The 1st coating layer is formed. Heating and applying a composition for forming an optical functional layer on the first coating layer to form a second coating layer. Preferably, the hard coat layer is formed by curing the first coating layer after heating. Similarly, the optical functional layer is preferably formed by curing the second coating layer. The formation and curing process of the second coating layer is usually performed after the curing process of the first coating layer. However, the second coating layer is formed on the heated first coating layer, and the first and first coating layers are formed. You may perform the hardening process of 2 coating layers simultaneously.

Arbitrary appropriate methods can be employ | adopted as a coating method of the composition for hard-coat layer formation or the composition for optical function layer formation. Examples thereof include a bar coating method, a roll coating method, a gravure coating method, a rod coating method, a slot orifice coating method, a curtain coating method, a fountain coating method, and a comma coating method.

The heating temperature of the first coating layer may be set to an appropriate temperature according to the composition of the hard coat layer forming composition, and preferably set to be equal to or lower than the glass transition temperature of the resin contained in the thermoplastic resin film. Is done. When heated at a temperature not higher than the glass transition temperature of the resin contained in the thermoplastic resin film, an optical laminate in which deformation due to heating is suppressed can be obtained. The heating temperature of the first coating layer is, for example, 80 ° C. to 140 ° C. When heated at such a temperature, the monomer, oligomer and / or prepolymer in the composition for forming a hard coat layer can penetrate and diffuse well into the thermoplastic resin film. The permeation layer described in the above section C is formed by the hard coat layer forming composition and the thermoplastic resin film forming material that has permeated through the heating and subsequent curing treatment. As a result, it is possible to obtain an optical laminate that is excellent in adhesion between the thermoplastic resin film and the hard coat layer and in which interference unevenness is suppressed. In addition, when the composition for hard-coat layer formation contains a solvent, the apply | coated composition for hard-coat layer formation can be dried by the said heating. The thickness of the permeation layer can be increased by setting the heating temperature high within the above range, for example.

In one embodiment, the heating temperature may be set according to the content ratio of the curable compound having two or more (meth) acryloyl groups and the monofunctional monomer contained in the composition for forming a hard coat layer. . The more the curable compound and / or monofunctional monomer having two or more (meth) acryloyl groups contained in the composition for forming a hard coat layer, the lower the heating temperature (for example, 80 ° C. to 100 ° C.), It is possible to obtain an optical laminate having excellent adhesion and suppressing interference unevenness, and an efficient manufacturing process with a small environmental load can be achieved.

Any appropriate curing process can be adopted as the curing process. Typically, the curing process is performed by ultraviolet irradiation. The integrated light quantity of ultraviolet irradiation is preferably 200 mJ to 400 mJ.

Hereinafter, the present invention will be specifically described by way of examples, but the present invention is not limited to these examples. The evaluation methods in the examples are as follows. In Examples, unless otherwise specified, “parts” and “%” are based on weight.

(1) Refractive index Measurement was performed using an Abbe refractometer (trade name: DR-M2 / 1550) manufactured by Atago Co., Ltd., selecting monobromonaphthalene as an intermediate solution.
(2) Thickness of osmotic layer A black acrylic plate (Mitsubishi Rayon Co., Ltd., thickness) is formed on the base layer side of the laminate having the configuration of [base layer / penetration layer / hard coat layer] prepared in Examples and Comparative Examples. 2 mm) was attached via an acrylic adhesive having a thickness of 20 μm. Next, the reflection spectrum of the hard coat layer was measured under the following conditions using an instantaneous multi-photometry system (trade name: MCPD3700, manufactured by Otsuka Electronics Co., Ltd.). From the peak position of the FFT spectrum, (hard coat layer + penetration layer) The thickness of was evaluated. In addition, the value measured by said (1) was used for the refractive index.
Reflection spectrum measurement conditions Reference: Mirror Algorithm: FFT method Calculation wavelength: 450 nm to 850 nm
・ Detection conditions Exposure time: 20 ms
Lamp gain: Normal Integration count: 10 times / FFT method Film thickness range: 2 to 15 μm
Film thickness resolution: 24nm
Moreover, the thickness of the hard coat layer was evaluated by the reflection spectrum measurement for the following laminate.
Stacked body: Example 1 except that a PET base material (trade name: U48-3, refractive index: 1.60) manufactured by Toray Industries, Inc. was used as the base film, and the heating temperature of the coating layer was set to 60 ° C. Obtained similarly.
In addition, since the composition for forming a hard coat layer does not penetrate into the PET substrate used in the laminate, the thickness of only the hard coat layer is measured from the peak position of the FFT spectrum obtained from the laminate. As a result of the evaluation, the thickness of the hard coat layer was 6 μm.
A positive value calculated from (thickness of (hard coat layer + penetration layer)) − (thickness of (hard coat layer)) was taken as the thickness of the permeation layer.
(3) Evaluation of whitening On the base material layer side of the laminate having the structure of [base material layer / penetration layer / hard coat layer / low refractive index layer] prepared in Examples and Comparative Examples, a black acrylic plate (10 cm × 10 cm) was pasted through an acrylic adhesive having a thickness of 20 μm to prepare a sample for evaluation. The prepared evaluation samples (each 3 samples) were put into a 60 ° C., 90% wet heat environment tester, and the samples were taken out after 3 days to confirm the presence or absence of whitening. The evaluation criteria for whitening are as follows.
[Evaluation criteria]
○: No whitening in all samples Δ: Whitening is observed in 1-2 samples ×: Whitening is observed in all samples XX: Whitening is remarkably observed in all samples.
(4) Contact angle Using a contact angle measuring device (product name “Drop Master DM700” manufactured by Kyowa Interface Chemical Co., Ltd.), 1 ml of water or hexadecane was dropped, and the contact angle after 3 seconds was determined.
(5) Measurement of concentration distribution The inside of the film was exposed by precision oblique cutting as shown in FIG. While confirming with a microscope that the surface of the low refractive index layer and the oblique cut cross-section are in the measurement region, harden the surface of the low refractive index layer with TOF-SIMS (product name “TOF-SIMS5”) manufactured by ION-TOF. A positive secondary ion line profile up to the inside of the coating layer was obtained.

<Production Example 1> Production of base film A 100 parts by weight of an imidized MS resin and a triazine-based ultraviolet absorber (trade name: T-712, manufactured by Adeka Co., Ltd.) described in Production Example 1 of JP 2010-284840 A Molecular weight 699) 0.62 parts by weight were mixed at 220 ° C. with a biaxial kneader to prepare resin pellets. The obtained resin pellets were dried at 100.5 kPa and 100 ° C. for 12 hours, extruded from a T-die at a die temperature of 270 ° C. with a single screw extruder, and formed into a film (thickness: 160 μm). Further, the film is stretched in an atmosphere of 150 ° C. in the transport direction (thickness 80 μm), and then stretched in an atmosphere of 150 ° C. in a direction orthogonal to the film transport direction to form a base film A (( (Meth) acrylic resin film). The base film A thus obtained had a light transmittance of 8.5% at a wavelength of 380 nm, an in-plane retardation Re of 0.4 nm, and a thickness direction retardation Rth of 0.78 nm. In addition, the moisture permeability of the obtained base film A was 61 g / m ² · 24 hr. The light transmittance was measured by measuring a transmittance spectrum in a wavelength range of 200 nm to 800 nm using a spectrophotometer (device name: U-4100) manufactured by Hitachi High-Tech Co., Ltd., and reading the transmittance at a wavelength of 380 nm. . The phase difference value was measured at a wavelength of 590 nm and 23 ° C. using a trade name “KOBRA21-ADH” manufactured by Oji Scientific Instruments. The moisture permeability was measured by a method according to JIS K 0208 under conditions of a temperature of 40 ° C. and a relative humidity of 92%.

<Production Example 2> Preparation of hollow silica fine particles As a low refractive index component, silica-based hollow fine particle dispersed sol (manufactured by Catalyst Kasei Kogyo Co., Ltd., trade name: Thruria 1420, average particle diameter 60 nm, concentration 20.5 wt%, dispersion medium: Isopropanol and particle refractive index of 1.30) were used. 1.88 g of γ-methacryloxypropyltrimethoxysilane was mixed with 100 g of this sol. To 100 g of the resulting organosol, a 28% aqueous ammonia solution was added to 400 ppm as ammonia, and the mixture was stirred at 40 ° C. for 5 hours, thereby obtaining a surface-treated silica-based hollow fine particle dispersed sol (solid content 20. 3%).

<Example 1>
60 parts of urethane acrylic oligomer (manufactured by Daicel-Cytec, trade name: KRM7804), 40 parts of pentaerythritol triacrylate (PETA) (trade name: Viscoat # 300, manufactured by Osaka Organic Chemical Industry Co., Ltd.), leveling agent (manufactured by DIC, product) Name: PC4100) 0.5 part and photopolymerization initiator (Ciba Japan Co., Ltd., trade name: Irgacure 907) 3 parts are mixed and diluted with methyl isobutyl ketone so that the solid content concentration is 50%. A composition for forming a hard coat layer was prepared.

On the base film A obtained in Production Example 1, the obtained composition for forming a hard coat layer is applied to form a first coating layer, and the first coating layer is heated at 100 ° C. for 1 minute. did. Configuration of [base layer / penetrating layer / hard coat layer] by irradiating the heated first coating layer with ultraviolet light having an integrated light quantity of 300 mJ / cm ^{2 with} a high-pressure mercury lamp to cure the first coating layer. A laminated body having was obtained.

Pentaerythritol triacrylate (PETA) (trade name: Biscoat # 300, manufactured by Osaka Organic Chemical Industry Co., Ltd., 50 parts), 246 parts of silica-based hollow fine particle dispersion sol obtained in Production Example 2 (50 parts as solid content), tetrafunctional Fluorine-containing compound (manufactured by Solvay Specialty Polymers Japan Ltd., trade name: MT70, solid content 80%, weight average molecular weight of main chain is 2,000, terminal tetrafunctional poly having a total weight average molecular weight of 3,000 (Tetrafluoroethylene oxide-co-difluoromethylene oxide)) 3.75 parts (3 parts as a solid content) and 5 parts of a photopolymerization initiator (Ciba Japan, trade name: Irgacure 2959) were mixed to obtain a solid content. The composition for low refractive index layer formation was prepared by diluting with methyl isobutyl ketone so that the concentration was 2%.

The composition for forming a low refractive index layer was applied to the surface of the hard coat layer of the laminate having the structure of [base layer / penetration layer / hard coat layer] obtained above so that the thickness after drying was 100 nm. A second coating layer was formed and heated at 60 ° C. for 1 minute. Thereafter, the second coating layer is irradiated with ultraviolet rays having an integrated light amount of 300 mJ / cm ^{2 with} a high-pressure mercury lamp to cure the second coating layer, and [base layer / penetration layer / hard coat layer / low refractive index). Optical layered body 1 having the configuration of [Layer] was obtained.

<Example 2>
Except that the blending amount of pentaerythritol triacrylate was 40 parts and the blending amount of the fluorine-containing compound was 12.5 parts (10 parts as a solid content), a composition for forming a low refractive index layer was prepared. In the same manner as in Example 1, an optical laminate 2 was obtained.

<Example 3>
The blended amount of pentaerythritol triacrylate is 40 parts, and, as a fluorine-containing compound, the terminal chain tetrafunctional poly (tetrahydrofuran) having a weight average molecular weight of 1,500 in the main chain and an overall weight average molecular weight of 3,000. Low refractive index layer using 14.3 parts (10 parts as solids) of fluoroethylene oxide-co-difluoromethylene oxide) (trade name: AD1700, 70% solids) manufactured by Solvay Specialty Polymers Japan An optical layered body 3 was obtained in the same manner as in Example 1 except that the forming composition was prepared.

<Example 4>
A polyfunctional fluorine-based polymer having a weight average molecular weight of 150,000 as a fluorine-containing compound (trade name: AR110, refractive index: 1.38) having a blending amount of pentaerythritol triacrylate of 40 parts and a fluorine-containing compound. The optical laminate 4 was prepared in the same manner as in Example 1 except that a composition for forming a low refractive index layer was prepared using a blending amount of 66.7 parts (solid content 15%) (solid content 10 parts). Got.

<Example 5>
A polyfunctional fluorine-based polymer having a weight average molecular weight of 150,000 as a fluorine-containing compound (trade name: AR110, refractive index: 1.38), the blending amount of pentaerythritol triacrylate being 30 parts. The optical laminate 5 was prepared in the same manner as in Example 1 except that the composition for forming a low refractive index layer was prepared using a blending amount of 133.4 parts (solid content 15%) (20 parts as solids). Got.

<Example 6>
The blending amount of pentaerythritol triacrylate is 40 parts, and 10 parts of fluorine-containing trifunctional (meth) acrylic monomer (manufactured by Kyoeisha Chemical Co., Ltd., trade name: LINC-3A, molecular weight = 728) is used as the fluorine-containing compound. The optical layered body 6 was obtained in the same manner as in Example 1 except that the composition for forming a low refractive index layer was prepared using the same amount.

<Example 7>
The blending amount of pentaerythritol triacrylate is 30 parts, and a fluorine-containing trifunctional (meth) acrylic monomer (manufactured by Kyoeisha Chemical Co., Ltd., trade name: LINC-3A, molecular weight = 728) is blended as a fluorine-containing compound. An optical layered body 7 was obtained in the same manner as in Example 1 except that the composition for forming a low refractive index layer was prepared by using an amount.

<Example 8>
A polyfunctional silicone compound (trade name: X-, manufactured by Shin-Etsu Chemical Co., Ltd.) containing 40 parts of pentaerythritol triacrylate and having an acrylic group and an alkoxysilyl group in the side chain instead of a fluorine-containing compound. An optical laminated body 8 was obtained in the same manner as in Example 1 except that a composition for forming a low refractive index layer was prepared using 20-1048, acrylic group / alkoxysilyl group = 1) in an amount of 10 parts. It was.

<Example 9>
A polyfunctional silicone compound (trade name: X-, manufactured by Shin-Etsu Chemical Co., Ltd.) containing 40 parts of pentaerythritol triacrylate and having an acrylic group and an alkoxysilyl group in the side chain instead of a fluorine-containing compound. An optical laminate 9 was obtained in the same manner as in Example 1 except that a composition for forming a low refractive index layer was prepared using 20-1050, acrylic group / alkoxysilyl group = 5) in a blending amount of 10 parts. It was.

<Example 10>
Dipentaerythritol hexaacrylate (DPHA) (manufactured by Shin-Nakamura Chemical Co., Ltd., trade name: A-DPH) 100 parts, leveling agent (manufactured by DIC, trade name: PC4100) and photopolymerization initiator (Ciba Japan) Example 1 except that a hard coat layer-forming composition was prepared by mixing 3 parts of the product, trade name: Irgacure 907) and diluting with methyl isobutyl ketone so that the solid content concentration was 50%. In the same manner, an optical laminate 10 was obtained.

<Example 11>
Dipentaerythritol hexaacrylate (DPHA) (manufactured by Shin-Nakamura Chemical Co., Ltd., trade name: A-DPH) 100 parts, leveling agent (manufactured by DIC, trade name: PC4100) and photopolymerization initiator (Ciba Japan) Example 2 except that a hard coat layer-forming composition was prepared by mixing 3 parts of the product, trade name: Irgacure 907) and diluting with methyl isobutyl ketone so that the solid content concentration was 50%. In the same manner, an optical laminate 11 was obtained.

<Example 12>
Dipentaerythritol hexaacrylate (DPHA) (manufactured by Shin-Nakamura Chemical Co., Ltd., trade name: A-DPH) 100 parts, leveling agent (manufactured by DIC, trade name: PC4100) and photopolymerization initiator (Ciba Japan) Example 4 except that a hard coat layer-forming composition was prepared by mixing 3 parts of the product, trade name: Irgacure 907) and diluting with methyl isobutyl ketone so that the solid concentration was 50%. In the same manner, an optical laminate 12 was obtained.

<Comparative Example 1>
The compounding amount of pentaerythritol triacrylate is 40 parts, and the polyfunctional fluorine-modified silicone compound (trade name: X-40-2729, refractive index: 1.42) manufactured by Shin-Etsu Chemical Co., Ltd. is used as the fluorine-containing compound. An optical laminate C1 was obtained in the same manner as in Example 1, except that a composition for forming a low refractive index layer was prepared using 10 parts by weight.

<Comparative example 2>
The blending amount of pentaerythritol triacrylate is 40 parts, and instead of the fluorine-containing compound, terminal methacryl-modified polydimethylsiloxane (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: X-22-174DX) is blended in 10 parts. An optical laminate C2 was obtained in the same manner as in Example 1 except that the composition for forming a low refractive index layer was prepared.

<Comparative Example 3>
For the formation of a low refractive index layer, the amount of pentaerythritol triacrylate is 40 parts, and a silicone compound (trade name: KL401, manufactured by Kyoeisha Chemical Co., Ltd.) is used in an amount of 10 parts instead of the fluorine-containing compound. An optical laminate C3 was obtained in the same manner as in Example 1 except that the composition was prepared.

<Comparative example 4>
The compounding amount of pentaerythritol triacrylate is 40 parts, and instead of the fluorine-containing compound, terminal methacryl-modified polydimethylsiloxane (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: X-22-164A) is used in an amount of 10 parts. An optical laminate C4 was obtained in the same manner as in Example 1 except that the composition for forming a low refractive index layer was prepared.

<Comparative Example 5>
The blending amount of pentaerythritol triacrylate is 40 parts, and instead of the fluorine-containing compound, terminal methacryl-modified polydimethylsiloxane (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: X-22-164B) is blended in 10 parts. An optical laminate C5 was obtained in the same manner as in Example 1 except that the composition for forming a low refractive index layer was prepared using the same.

<Comparative Example 6>
The blending amount of pentaerythritol triacrylate is 40 parts, and instead of the fluorine-containing compound, terminal methacryl-modified polydimethylsiloxane (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: X-22-164C) is blended in 10 parts. An optical laminate C6 was obtained in the same manner as in Example 1 except that the composition for forming a low refractive index layer was prepared using the same.

<Comparative Example 7>
Low refractive index using a blending amount of pentaerythritol triacrylate of 40 parts and using a pentafunctional silicone compound (product name: tego rad 2011, manufactured by Evonik, Inc.) in a blending amount of 10 parts instead of the fluorine-containing compound. An optical laminate C7 was obtained in the same manner as in Example 1 except that the layer forming composition was prepared.

<Comparative Example 8>
Dipentaerythritol hexaacrylate (DPHA) (manufactured by Shin-Nakamura Chemical Co., Ltd., trade name: A-DPH) 100 parts, leveling agent (manufactured by DIC, trade name: PC4100) and photopolymerization initiator (Ciba Japan) Comparative Example, except that 3 parts of the product, trade name: Irgacure 907) were mixed and diluted with methyl isobutyl ketone so that the solid concentration was 50% to prepare a composition for forming a hard coat layer. In the same manner as in Example 1, an optical laminate C8 was obtained.

Table 1 shows the evaluation results of the optical laminates obtained in the above examples and comparative examples. In addition, the results of examining the distribution of components derived from the (meth) acrylic resin film in the low refractive index layer of the optical layered body obtained in Example 1 and Comparative Examples 1 and 2 (72 hours after production) are shown in FIG. 3 shows.

As is clear from Table 1, the optical laminate of the present invention has a marked improvement in the problem of whitening. From the graph of FIG. 3, it can be seen that in the optical laminate of Example 1, components derived from the thermoplastic resin film are present at a higher concentration inside than the surface of the low refractive index layer.

In addition, when the precipitate generated on the surface of the low refractive index layer of the optical laminate of the comparative example was analyzed, the precipitate was obtained by adding a resin component containing a triazine-based ultraviolet absorber and a glutarimide structural unit added to the base film A. Included. Moreover, when the comparative example 1 and the comparative example 8 were compared, the whitening of the comparative example 1 was lighter. This shows that whitening can also be reduced by reducing the compounding ratio of the monomers in the hard coat layer forming composition.

The optical layered body of the present invention can be suitably used for an image display device. The optical layered body of the present invention can be suitably used as a front plate of an image display device or a protective material for a polarizer, and particularly suitably used as a front plate of a liquid crystal display device (in particular, a three-dimensional liquid crystal display device). obtain.

DESCRIPTION OF SYMBOLS 10 Base material layer 20 Penetration layer 30 Hard coat layer 40 Optical

functional layer

100, 200 Optical laminated body

Claims

A base material layer formed from a thermoplastic resin film;
A hard coat layer formed by applying a composition for forming a hard coat layer on a thermoplastic resin film;
Between the base material layer and the hard coat layer, a penetrating layer formed by penetrating the thermoplastic resin film with the hard coat layer forming composition;
An optical functional layer formed by applying a composition for forming an optical functional layer to a hard coat layer, and
The optical functional layer contains a component derived from a thermoplastic resin film eluted from the thermoplastic resin film,
An optical laminate in which a component derived from a thermoplastic resin film is present at a higher concentration inside than the surface of the optical functional layer.
The optical laminate according to claim 1, wherein the thermoplastic resin film is a (meth) acrylic resin film.
The thermoplastic resin film-derived component is a triazine UV absorber, a benzotriazole UV absorber, a benzophenone UV absorber, a cyanoacrylate UV absorber, a benzoxazine UV absorber, or an oxadiazole UV absorber. The optical laminate according to claim 1, wherein the optical laminate is at least one ultraviolet absorber selected from:
The optical laminate according to any one of claims 1 to 3, wherein the composition for forming an optical functional layer comprises a curable compound, fine particles having a refractive index of 1.44 or less, and an antifouling agent.
The optical laminate according to claim 4, wherein the antifouling agent is a fluorine-containing compound.
The optical laminate according to any one of claims 1 to 5, wherein the composition for forming a hard coat layer contains a curable compound having two or more (meth) acryloyl groups.
The composition for forming a hard coat layer contains a monomer, an oligomer and / or a prepolymer as a curable compound, and the total amount of the oligomer and the prepolymer is 20% by weight to 90% by weight with respect to the total amount of the curable compound. The optical laminated body in any one of Claim 1 to 6.
A polarizing film comprising the optical laminate according to any one of claims 1 to 7.
The image display apparatus containing the optical laminated body in any one of Claim 1-8.