TWI551881B - Optical continuum - Google Patents

Description

Optical laminate

The present invention relates to an optical laminate.

An image display device such as a liquid crystal display (LCD), a cathode ray tube display device (CRT), a plasma display (PDP), or an electroluminescence display (ELD) has a situation in which a surface is caused by contact from the outside. Damage, the visibility of the displayed image is reduced. Therefore, in order to protect the surface of the image display device, an optical layered body including a substrate layer and a hard coat layer is used. Examples of the optical layered body having such a configuration include an optical layered body including a base material layer containing a (meth)acrylic resin film and a hard coat layer, and each layer is formed between the layers. The permeable layer formed by dissolving the components suppresses interference spots and improves adhesion (for example, Patent Document 1).

Further, in general, it is required for an image display device to reduce surface reflection caused by light irradiated from the outside, thereby improving visibility. On the other hand, the optical layered body in which the antireflection layer is formed on the base material layer is used to reduce the surface reflection of the image display device, and the visibility is improved. For example, an optical layered body having a low refractive index layer having a refractive index lower than that of the base material layer as an antireflection layer is provided on the outermost surface (for example, Patent Document 2).

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2012-234163

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2010-85983

The inventors of the present invention have found that when the surface of the hard coat layer of the optical layered body including the permeation layer is further provided with an optical functional layer such as a low refractive index layer, the surface of the optical functional layer becomes white with time. Further, the reason for the whitening was examined, and as a result, it was confirmed that the component derived from the substrate film oozes out to the surface of the optical functional layer via the permeation layer and the hard coat layer.

The present invention relates to an optical layered body comprising a substrate layer, a hard coat layer, and a permeation layer disposed between the layers, and having an optical functional layer on the side of the hard coat layer where the permeation layer is not provided, the optical layered body Improve the above-mentioned whitening problems of new discoveries.

The optical layered body of the present invention comprises: a base material layer formed of a thermoplastic resin film; a hard coat layer formed by coating a composition for forming a hard coat layer on a thermoplastic resin film; and a permeation layer which is a hard coat layer The composition for formation penetrates into the thermoplastic resin film to be formed between the base layer and the hard coat layer, and the optical functional layer is formed by coating the composition for forming an optical functional layer with a hard coat layer. The optical functional layer contains a component derived from a thermoplastic resin film which is eluted from the thermoplastic resin film. The component derived from the thermoplastic resin film is present in the optical functional layer at a higher concentration 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 is selected from the group consisting of three UV absorber, benzotriazole UV absorber, benzophenone UV absorber, cyanoacrylate UV absorber, benzo UV absorber and At least one ultraviolet absorber of a diazole-based ultraviolet absorber.

In one embodiment, the composition for forming an optical functional layer contains 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 comprises two or more A (meth)acryloyl group-based curable compound.

In one embodiment, the composition for forming a hard coat layer contains a monomer and an oligomer and/or a prepolymer as a curable compound, and an oligomer and a prepolymer with respect to the total amount of the curable compound. The total amount is from 20% by weight to 90% by weight.

According to another aspect of the present invention, a polarizing film is provided. The polarizing film contains the above optical laminate.

According to still another aspect of the present invention, an image display device is provided. The image display device includes the above optical laminate.

According to the optical layered body of the present invention, the component from the substrate film which is mixed into the optical functional layer via the permeable layer and the hard coat layer is stably held inside the optical functional layer, whereby the problem of whitening can be improved.

10, 10'‧‧‧ substrate layer

20‧‧‧permeable layer

30, 30'‧‧‧ Hard coating

40, 40'‧‧‧ optical functional layer

100,200‧‧‧Optical laminate

A‧‧‧ junction

B‧‧‧ Junction

Fig. 1(a) is a schematic cross-sectional view showing an optical layered body according to a preferred embodiment of the present invention, and Fig. 1(b) is a schematic cross-sectional view showing an optical layered body having no permeable layer.

Fig. 2 is a schematic view showing the precision oblique cutting of the optical layered body of the embodiment or the comparative example. The portion indicated by the thick solid line in the figure corresponds to the measurement site.

Fig. 3 is a graph showing the distribution of components from the thermoplastic resin film in the low refractive index layer of the optical layered body of the embodiment or the comparative example. The horizontal axis represents the measurement distance, and the vertical axis represents the ionic strength from the component, and it is shown that the higher the intensity, the higher the concentration. Further, the broken line in the graph indicates the ultraviolet absorber added to the thermoplastic resin film, and the solid line indicates the thermoplastic resin component containing the pentylene imide unit.

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

A. The overall composition of the optical laminate

Fig. 1(a) is a schematic cross-sectional view showing an optical layered body according to a preferred embodiment of the present invention, and Fig. 1(b) is a schematic cross-sectional view showing an optical layered body having no permeable layer. The optical layered body 100 shown in Fig. 1(a) is provided with a base material layer 10 formed of a thermoplastic resin film, a permeation layer 20, a hard coat layer 30, and an optical functional layer 40 in this order. The optical functional layer 40 is formed by coating the composition for forming an optical functional layer on the hard coat layer 30. The hard coat layer 30 is formed by coating a composition for forming a hard coat layer on a thermoplastic resin film. The permeable layer 20 is formed by infiltrating a composition for forming a hard coat layer into a thermoplastic resin film. That is, the permeable layer 20 is a part in which a hard coat component is present in the thermoplastic resin film. When the base layer 10 is infiltrated into the thermoplastic resin film as described above, the composition for forming a hard coat layer in the thermoplastic resin film does not reach (infiltrate). On the other hand, the optical layered body 200 shown in Fig. 1(b) does not form a permeation layer. The boundary A shown in Fig. 1 (a) and (b) is a boundary defined by the coated surface of the composition for forming a hard coat layer of a thermoplastic resin film. Therefore, regarding the boundary A, the interface between the permeable layer 20 and the hard coat layer 30 in the optical layered body 100 is the base material layer 10' (i.e., thermoplastic resin film) and the hard layer in the optical layered body 200 in which the permeable layer is not formed. The junction of the coating 30'.

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

B. substrate layer

The substrate layer is formed of any suitable thermoplastic resin film. More specifically, the base material layer is a portion where the composition for forming a hard coat layer does not reach (infiltrate) in the thermoplastic resin film when the composition for forming a hard coat layer is applied to the thermoplastic resin film.

Specific examples of the thermoplastic resin film include a (meth)acrylic resin film, a cellulose resin film such as triacetyl cellulose, and a polyolefin resin film such as polyethylene or polypropylene; A cycloolefin resin film such as a olefin, a polyester resin film such as polyethylene terephthalate or polybutylene terephthalate. Among them, a (meth)acrylic resin film is preferred. When a (meth)acrylic resin film is used as the base film, the permeation layer can be favorably formed, and on the other hand, the formation component of the film is easily eluted, and the problem of whitening tends to occur, so that it is more preferable. The effect of the present invention is obtained. In the present specification, the term "(meth)acrylic group" means an acrylic group and/or a methacryl group.

The transmittance of light at a wavelength of 380 nm of the thermoplastic resin film is preferably 15% or less, more preferably 12% or less, still more preferably 9% or less. When the transmittance of light having a wavelength of 380 nm is in the above range, excellent ultraviolet absorbing ability is exhibited, and thus ultraviolet ray deterioration by external light or the like of the optical layered body 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, still more preferably 5 nm or less, still more preferably 3 nm or less, and most preferably 1 nm or less. The thickness direction phase difference 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. When the in-plane phase difference and the thickness direction phase difference are in the above range, it is possible to remarkably suppress the adverse effect on the display characteristics of the image display device due to the phase difference. More specifically, deformation of the interference spot or the 3D image for the case of the liquid crystal display device for 3D display can be remarkably suppressed. Further, the in-plane phase difference Re and the thickness direction phase difference Rth can be obtained by the following equation: Re = (nx - ny) × d Rth = (nx - nz) × d

Here, the refractive index of the nx-based thermoplastic resin film in the slow axis direction, the refractive index of the ny-based thermoplastic resin film in the direction of the phase axis, the refractive index of the thickness direction of the nz-based thermoplastic resin film, and the d (nm)-based thermoplastic resin The thickness of the film. The retardation axis refers to the direction in which the refractive index in the plane of the film becomes maximum, and the phase in the axis refers to the direction perpendicular to the axis of the slow phase in the plane. Representatively, Re and Rth are measured using light having a wavelength of 590 nm.

The (meth)acrylic resin film contains a (meth)acrylic resin. The (meth)acrylic resin film can be obtained, for example, by extrusion molding a molding material containing a resin component containing a (meth)acrylic resin as a main component. As a specific example, having the above range The (meth)acrylic resin film having a phase difference in the in-plane direction and a phase difference in the thickness direction can be obtained, for example, by using the following (meth)acrylic resin having a glutarylene imine structure.

The moisture permeability of the (meth)acrylic resin film is preferably 200 g/m ² ‧24 hr or less, more preferably 80 g/m ² ‧24 hr or less. According to the present invention, even if a (meth)acrylic resin film having a high moisture permeability as described above is used, it is possible to obtain an optical fiber having excellent adhesion between the (meth)acrylic resin film and the hard coat layer and suppressing interference spots. Laminated body. Further, the moisture permeability can be measured, for example, under the test conditions of 40 ° C and a relative humidity of 92% in accordance with the method of JIS Z 0208.

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

The weight average molecular weight of the above (meth)acrylic resin is preferably from 10,000 to 500,000. If the weight average molecular weight is too small, the mechanical strength in the case of forming 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 moldability is lowered, and the productivity of a molded article 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 the above 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, and is preferably 170 ° C or less from the viewpoint of moldability and the like.

The above (meth)acrylic resin preferably has a structural unit exhibiting positive birefringence and A structural unit that exhibits negative birefringence. When these structural units are provided, the existence ratio of the structural units can be adjusted, and the phase difference of the (meth)acrylic resin film can be suppressed, and a (meth)acrylic resin film having a low phase difference can be obtained. Examples of the structural unit exhibiting positive birefringence include structural units constituting a lactone ring, a polycarbonate, a polyvinyl alcohol, a cellulose acetate, a polyester, a polyarylate, a polyimide, a polyolefin, and the like. The structural unit represented by the formula (1). 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, and the following formula (3) ) The structural unit shown, etc. In the present specification, the structural unit exhibiting positive birefringence means a structural unit having only a case where the resin of the structural unit exhibits a positive birefringence characteristic (that is, a case where a late phase axis is expressed in a direction in which the resin extends). Further, the structural unit exhibiting negative birefringence means a structural unit in which only the resin having the structural unit exhibits a negative birefringence characteristic (that is, a case where a slow phase axis is expressed in a direction perpendicular to the extending direction of the resin).

As the (meth)acrylic resin, a (meth)acrylic resin having a lactone ring structure or a pentaneimine structure can be preferably used. The (meth)acrylic resin having a lactone ring structure or a pentaneimine structure is excellent in heat resistance. More preferably, it is a (meth)acrylic resin which has a glutarylene imine structure. When a (meth)acrylic resin having a pentylenediamine structure is used, a (meth)acrylic resin film which is low in moisture permeability and has a small phase difference and a small ultraviolet transmittance can be obtained as described above. A (meth)acrylic resin having a pentylene quinone imine structure (hereinafter also referred to as a glutarylene imide resin) is disclosed in, for example, JP-A-2006-309033, JP-A-2006-317560 Japanese Patent Laid-Open No. Hei. No. 2006-328329, Japanese Patent Laid-Open No. Hei. No. 2006-328334, Japanese Patent Laid-Open No. Hei. No. 2006-337491, Japanese Patent Laid-Open No. Hei. No. 2006-337492, and Japanese Patent Laid-Open No. Hei. No. 2006-337493 Japanese Patent Laid-Open No. Hei. No. 2006-337569, Japanese Patent Laid-Open No. Hei. No. 2007-009182, and Japanese Patent Laid-Open No. 2009-161744. These records are cited herein by reference.

It is preferable that the pentylene quinone imine resin contains a structural unit represented by the following formula (1) (hereinafter, also referred to as a pentaneimine unit), and a structural unit represented by the following formula (2) (hereinafter, also referred to as (meth) 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, a cycloalkyl group having 3 to 12 carbon atoms, or A substituent having an aromatic ring of 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, a cycloalkyl group having 3 to 12 carbon atoms, or A substituent having an aromatic ring of 5 to 15 carbon atoms.

The pentylene quinone imine resin may further contain a structural unit represented by the following formula (3) (hereinafter also referred to as an aromatic vinyl-based unit) as needed.

[Chemical 2]

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 above formula (1), R ¹ and R ² are each independently hydrogen or methyl, R ³ is hydrogen, methyl, butyl or cyclohexyl, and further preferably R ¹ is methyl, R ² is hydrogen and R ³ is methyl.

The glutarylenediamine resin may contain only a single species as a pentaneimine unit, or may contain a plurality of different species of R ¹ , R ² , and R ³ in the above formula (1) as pentaneimine. unit.

The pentacene imine unit can be formed by imidating the (meth) acrylate unit represented by the above formula (2). Further, the pentanediamine unit may be obtained by using an acid anhydride such as maleic anhydride or a half ester of such an acid anhydride with a linear or branched alcohol having 1 to 20 carbon atoms; acrylic acid, methacrylic acid, and horse. An α,β-ethylenically unsaturated carboxylic acid such as acid, maleic anhydride, itaconic acid, itaconic acid, crotonic acid, fumaric acid or citraconic acid is formed by imidization of hydrazine.

In the above formula (2), R ⁴ and R ⁵ are each independently hydrogen or methyl, R ⁶ is hydrogen or methyl, and further preferably R ⁴ is hydrogen, R ⁵ is methyl, and R ⁶ is methyl.

The glutarylenediamine resin may contain only a single species as a (meth) acrylate unit, or may contain a plurality of species different from R ⁴ , R ⁵ , and R ⁶ in the above formula (2) as (meth) Acrylate unit.

The glutarylenediamine resin preferably contains styrene, α-methylstyrene or the like as the aromatic vinyl unit represented by the above formula (3), and further preferably contains styrene as the above formula (3). ) an aromatic vinyl unit represented. By having such an aromatic vinyl unit, a (meth)acrylic resin film having a low birefringence and a lower phase difference can be obtained.

The pentamethylene imine resin may contain only a single type as an aromatic vinyl unit, or may contain a plurality of types different from R ⁷ and R ⁸ as an aromatic vinyl unit.

The content of the pentylene diimine unit in the pentylene quinone imine resin is preferably changed depending on, for example, the structure of R ³ . The content of the pentanediamine unit is preferably from 1% by weight to 80% by weight, more preferably from 1% by weight to 70% by weight, based on the total structural unit of the glutarylenediamine resin, and further preferably 1% by weight to 60% by weight, particularly preferably 1% by weight to 50% by weight. When the content of the pentamethylene imine unit is in the above range, a (meth)acrylic resin film having a low phase difference excellent in heat resistance can be obtained.

The content of the above aromatic vinyl unit in the glutarylenediamine resin can be appropriately set depending on the purpose or desired characteristics. The content of the aromatic vinyl unit may be 0 depending on the use. In the case of containing an aromatic vinyl unit, the content is preferably from 10% by weight to 80% by weight, more preferably from 20% by weight to 80% by weight based on the glutarylenediamine unit of the glutarylenediamine resin. %, further preferably 20% by weight to 60% by weight, particularly preferably 20% by weight to 50% by weight. When the content of the aromatic vinyl unit is in the above range, a (meth)acrylic resin film having a low phase difference and excellent heat resistance and mechanical strength can be obtained.

Further, in the pentylene quinone imine resin, other structural units other than the glutarylene imide unit, the (meth) acrylate unit, and the aromatic vinyl unit may be copolymerized as needed. Examples of the other structural unit include a nitrile monomer such as acrylonitrile or methacrylonitrile, maleimide, N-methyl maleimide, N-phenyl maleimide, and N. a structural unit composed of a maleidinoimine monomer such as cyclohexylmaleimide. These other structural units may be directly copolymerized in the above glutarylenediamine resin, or may be graft copolymerized.

The thermoplastic resin film contains an ultraviolet absorber. As the ultraviolet absorber, any suitable ultraviolet absorber can be used as long as the above-mentioned desired characteristics can be obtained. As a representative example of the above ultraviolet absorber, three can be cited: UV absorber, benzotriazole UV absorber, benzophenone UV absorber, cyanoacrylate UV absorber, benzo UV absorber, and Diazole-based UV absorber. These ultraviolet absorbers may be used singly or in combination of plural kinds.

The content of the ultraviolet absorber is preferably from 0.1 part by weight to 5 parts by weight, more preferably from 0.2 part by weight to 3 parts by weight, per 100 parts by weight of the thermoplastic resin. When the content of the ultraviolet absorber is in the above range, ultraviolet rays can be efficiently absorbed, and the transparency of the film at the time of film formation is not lowered. When the content of the ultraviolet absorber is less than 0.1 part by weight, the blocking effect of ultraviolet rays tends to be insufficient. When the content of the ultraviolet absorber is more than 5 parts by weight, the coloration becomes severe, or the haze of the film after molding becomes high, or the transparency tends to be deteriorated.

The above thermoplastic resin film may contain any appropriate additives depending on the purpose. Examples of the additive include antioxidants such as hindered phenol-based, phosphorus-based, and sulfur-based antioxidants; stabilizers such as light stabilizers, weathering stabilizers, and heat stabilizers; reinforcing materials such as glass fibers and carbon fibers; and near-infrared absorbing agents; Flame retardants such as (dibromopropyl) ester, triallyl phosphate, and antimony trioxide; antistatic agents such as anionic, cationic, and nonionic surfactants; colorants such as inorganic pigments, organic pigments, and dyes Organic filler or inorganic filler; resin modifier; plasticizer; lubricant; phase difference reducing agent. The type, combination, content, and the like of the additive to be contained may be appropriately set depending on the purpose or 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 or additives as needed may be sufficiently mixed by any appropriate mixing method to prepare a thermoplastic in advance. After the resin composition, it is subjected to film formation. Alternatively, a thermoplastic resin, an ultraviolet absorber, and, if necessary, other polymers or additives may be separately prepared into respective solutions to form a homogeneous mixed solution, followed by film formation.

In the production of the above thermoplastic resin composition, the above-mentioned film raw material is pre-doped, for example, by any appropriate mixer such as a mixing homogenizer, and the obtained mixture is subjected to extrusion kneading. In this case, the mixer used for the 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 can be used.

Examples of the method for forming the film include a solution casting method (solution casting method), a melt extrusion method, a calendering method, and a compression molding method. A melt extrusion method is preferred. In the melt extrusion method, since no solvent is used, the manufacturing cost or the load on the earth environment or the working environment caused by the solvent can be reduced.

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

In the case of film formation by the above-described T-die method, a T-die can be attached to the end of a known single-axis extruder or a twin-screw extruder, and a film-like extruded film can be taken up to obtain Roll-shaped film. At this time, the temperature of the take-up roll can be appropriately adjusted, and the extension can be applied to the extrusion direction, thereby performing uniaxial stretching. Further, simultaneous biaxial stretching, sequential biaxial stretching, or the like may be performed by extending 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 phase difference is obtained. In the case of a stretched film, it may be either a uniaxially stretched film or a biaxially stretched film. In the case of a biaxially stretched film, it may be either a simultaneous biaxially stretched film or a sequential biaxially stretched film.

The above extension temperature is preferably in the vicinity of the glass transition temperature of the thermoplastic resin composition as the film raw material, and specifically, it is preferably (glass transition temperature - 30 ° C) - (glass transition temperature + 30 ° C), more preferably (glass The transfer temperature is -20 ° C) ~ (glass transition temperature + 20 ° C). If the extension temperature is not reached (glass transition temperature -30 ° C), there is a possibility that the haze of the obtained film becomes large, or the film is cracked or broken, and a specific stretching ratio is not obtained. On the other hand, if the elongation temperature exceeds (glass transition temperature + 30 ° C), there is a tendency that the thickness unevenness of the obtained film becomes large, or the elongation, the tear expansion strength, and the fatigue resistance, etc. cannot be sufficiently improved. nature. Further, there is a tendency that the film adheres to the roller easily.

The above stretching ratio is preferably 1.1 to 3 times, more preferably 1.3 to 2.5 times. If the stretching ratio is in the above range, the elongation of the film, the strength of tearing, and the fatigue resistance can be greatly improved. And other mechanical properties. As a result, it is possible to manufacture a film in which the thickness unevenness is small, the birefringence is practically zero (thus, the phase difference is small), and the haze is small.

The thermoplastic resin film may be subjected to heat treatment (annealing) or the like after the stretching treatment in order to stabilize the optical isotropic properties or mechanical properties. The conditions of the heat treatment may be any suitable conditions.

The thickness of the thermoplastic resin film is preferably from 10 μm to 200 μm, more preferably from 20 μm to 100 μm. If the thickness is less than 10 μm, there is a possibility that the strength is lowered. When the thickness exceeds 200 μm, the transparency is lowered.

The wetting tension of the surface of the thermoplastic resin film is preferably 40 mN/m or more, more preferably 50 mN/m or more, and still more preferably 55 mN/m or more. When the wetting tension of the surface is 40 mN/m or more, the adhesion between the thermoplastic resin film and the hard coat layer is further improved. In order to adjust the wetting tension of the surface, any suitable surface treatment can be carried out. Examples of the surface treatment include corona discharge treatment, plasma treatment, ozone blowing, ultraviolet irradiation, flame treatment, and chemical treatment. Among these, corona discharge treatment and plasma treatment are preferred.

C. Permeation layer

The permeable layer is formed by infiltrating the thermoplastic resin film into the composition for forming a hard coat layer as described above. In other words, the permeation layer may correspond to a portion of the phase of the dissolution of the thermoplastic resin forming the thermoplastic resin film and the component forming the hard coat layer.

In the above-mentioned permeable layer, the concentration of the thermoplastic resin forming the thermoplastic resin film is preferably continuously increased from the side of the hard coat layer toward the side of the base material layer. This is because the concentration of the thermoplastic resin is continuously changed, that is, the interface at which the concentration of the thermoplastic resin is changed is not formed, and the interface reflection can be suppressed, and an optical layered body having less interference spots can be obtained.

The lower limit of the thickness of the above-mentioned permeable layer is, for example, 1.2 μm, preferably 1.5 μm, more preferably 2.5 μm, still more preferably 3 μm. The upper limit of the thickness of the permeable layer is preferably (thickness of the thermoplastic resin film × 70%) μm, more preferably (thickness of the thermoplastic resin film × 40%) μm, and further preferably (thickness of the thermoplastic resin film × 30%) Mm, especially good (thermoplastic resin film ×20%) μm. When the thickness of the permeable layer is in the above range, an optical layered body having excellent adhesion between the thermoplastic resin film and the hard coat layer and suppressing interference spots can be obtained. In addition, the thickness of the permeable layer is the thickness of the portion where the hard coat layer is formed in the thermoplastic resin film, and as described with reference to Fig. 1, the portion of the thermoplastic resin film where the hard coat layer is formed ( The distance between the boundary B of the permeable layer and the portion (base material layer) where the hard coating layer is not formed, and the boundary A. The thickness of the permeable layer can be measured by a reflection spectrum of a hard coat layer or an electron microscope such as an SEM (Scanning Electron Microscope) or a TEM (Transmission Electron Microscopy). The details of the method for measuring the thickness of the permeation layer using the reflection spectrum are described below as evaluation methods in the examples.

In the optical layered body of the present invention having the permeable layer having the thickness within the above-described range, even if a material having a large difference in refractive index is selected as a material for forming the thermoplastic resin film and the hard coat layer, the generation of interference spots 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, the absolute value of the difference in refractive index may also be set to less than 0.01.

D. Hard coating

The hard coat layer is formed by applying a composition for forming a hard coat layer onto the thermoplastic resin film as described above. The composition for forming a hard coat layer contains, for example, a curable compound which can be cured by heat, light (ultraviolet rays, etc.) or an electron beam. It is preferred that the composition for forming a hard coat layer contains a photocurable type curable compound. The curable compound may also 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) acrylonitrile groups. The upper limit of the number of (meth) acrylonitrile groups contained in the curable compound having two or more (meth) acrylonitrile groups is preferably 100. Since the curable compound having two or more (meth)acryl fluorenyl groups is excellent in compatibility with the (meth)acrylic resin, when a (meth)acrylic resin film is used as the thermoplastic resin film, the coating is applied. The cloth easily penetrates and diffuses into the (meth)acrylic resin film. Further, in the present specification, "(meth)acrylylene" means a methacryl fluorenyl group and/or an acryl fluorenyl group.

Examples of the curable compound having two or more (meth)acryl fluorenyl groups include tricyclodecane dimethanol diacrylate, pentaerythritol di(meth) acrylate, and pentaerythritol tri(meth) acrylate. , trimethylolpropane triacrylate, pentaerythritol tetra(meth)acrylate, dimethylolpropane tetraacrylate, dipentaerythritol hexa(meth)acrylate, 1,6-hexanediol (meth)acrylic acid Ester, 1,9-nonanediol diacrylate, 1,10-decanediol (meth) acrylate, polyethylene glycol di(meth) acrylate, polypropylene glycol di(meth) acrylate, two Propylene glycol diacrylate, tris(meth)acrylate, ethoxylated glycerol triacrylate, pentoxide tetraol tetraacrylate, and oligomers or prepolymers thereof. The curable compound having two or more (meth) acrylonitrile groups may be used singly or in combination of plural kinds. In the present specification, the term "(meth)acrylate" means acrylate and/or methacrylate.

The curable compound having two or more (meth) acrylonitrile groups preferably has a hydroxyl group. When the composition for forming a hard coat layer contains such a curable compound, the heating temperature at the time of formation of the hard coat layer can be set lower, the heating time can be set shorter, and the deformation due to heating can be efficiently produced. Optical laminate. Moreover, an optical layered body excellent in adhesion between a thermoplastic resin film (for example, a (meth)acrylic resin film) and a hard coat layer can be obtained. Examples of the curable compound having a hydroxyl group and two or more (meth)acryl fluorenyl groups include pentaerythritol tri(meth)acrylate and dipentaerythritol pentaacrylate.

The content ratio of the curable compound having two or more (meth) acrylonitrile groups is preferably a total amount of the monomer, the oligomer, and the prepolymer in the composition for forming a hard coat layer. 30% by weight to 100% by weight, more preferably 40% by weight to 95% by weight, even more preferably 50% by weight to 95% by weight. When it is in the above range, the thermoplastic resin film (for example, a (meth)acrylic resin film) is excellent in adhesion to the hard coat layer, and the interference spot is suppressed. Optical laminate. Moreover, the hardening shrinkage of the hard coat layer can be effectively prevented.

The composition for forming a hard coat layer may further contain a monofunctional monomer as a curable compound. Since the monofunctional monomer easily permeates into the thermoplastic resin film (for example, a (meth)acrylic resin film), when the monofunctional monomer is contained, the adhesion between the thermoplastic resin film and the hard coat layer is excellent, and interference spots are obtained. Inhibited optical laminate. Further, when the composition for forming a hard coat layer contains a monofunctional monomer, the heating temperature at the time of formation of the hard coat layer can be set lower, the heating time can be set shorter, and the optical fiber can be efficiently produced by suppressing deformation due to heating. Laminated body. In the case where the composition for forming a hard coat layer contains a monofunctional monomer, the content ratio of the monofunctional monomer is preferably 40% by weight or less based on the total amount of the curable compound in the composition for forming a hard coat layer. More preferably, it is 30 weight% or less, More preferably, it is 20 weight% or less. When the content of the monofunctional monomer is more than 40% by weight, the desired hardness and scratch resistance cannot be obtained.

The weight average molecular weight of the above monofunctional monomer is preferably 500 or less. When it is such a monofunctional monomer, it penetrates easily and diffuses to a thermoplastic resin film (for example, (meth)acrylic-resin film). Examples of such a monofunctional monomer include ethoxylated o-phenylphenol (meth) acrylate, methoxy polyethylene glycol (meth) acrylate, and phenoxy polyethylene glycol (methyl). Acrylate, 2-ethylhexyl acrylate, lauryl acrylate, isooctyl acrylate, isostearyl acrylate, cyclohexyl acrylate, acrylic acid Base ester, phenoxyethyl acrylate, benzyl acrylate, 2-hydroxy-3-phenoxy acrylate, propylene morpholine, 2-hydroxyethyl (meth) acrylate, 4-hydroxy butyl (meth) acrylate Ester, dimethylaminopropyl acrylamide, N-(2-hydroxyethyl) (meth) acrylamide, and the like.

The above monofunctional monomer preferably has a hydroxyl group. In the case of such a monofunctional monomer, the heating temperature at the time of formation of the hard coat layer can be set lower, and the heating time can be set shorter, and the optical layered body which suppresses deformation by heating can be efficiently produced. In addition, when the composition for forming a hard coat layer contains a monofunctional monomer having a hydroxyl group, an optical layer excellent in adhesion between a thermoplastic resin film (for example, a (meth)acrylic resin film) and a hard coat layer can be obtained. body. Examples of such a monofunctional monomer include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, and 2-hydroxy-acrylate. Hydroxyalkyl (meth) acrylate such as 3-phenoxy ester, 1,4-cyclohexane methanol monoacrylate; N-(2-hydroxyethyl)(methyl) acrylamide, N-methylol N-(2-hydroxyalkyl)(methyl) acrylamide such as (meth)acrylamide. Among them, 4-hydroxybutyl acrylate and N-(2-hydroxyethyl) acrylamide are preferred.

The boiling point of the above monofunctional monomer is preferably higher than the heating temperature of the coating layer at the time of formation of the hard coat layer (described below). The boiling point of the above monofunctional monomer is, for example, preferably 150 ° C or higher, more preferably 180 ° C or higher, and particularly preferably 200 ° C or higher. When it is such a range, it is possible to prevent the monofunctional monomer from volatilizing due to heating at the time of formation of the hard coat layer, and to allow the monofunctional monomer to sufficiently penetrate into the thermoplastic resin film (for example, a (meth)acrylic resin film). .

The composition for forming a hard coat layer preferably contains an oligomer of (meth)acrylic acid urethane and/or (meth)acrylic acid urethane as a curable compound. When the composition for forming a hard coat layer contains an oligomer of (meth)acrylic acid urethane and/or (meth)acrylic acid urethane, flexibility and adhesion to a thermoplastic resin film can be formed. Excellent hard coating. The above (meth)acrylic acid urethane can be obtained, for example, by reacting a (meth)acrylic acid hydroxyester obtained from (meth)acrylic acid or a (meth)acrylic acid ester with a polyhydric alcohol with a diisocyanate. The oligomer of (meth)acrylic acid urethane and (meth)acrylic acid urethane may be used singly or in combination of plural kinds.

Examples of the (meth) acrylate include methyl (meth) acrylate, ethyl (meth) acrylate, isopropyl (meth) acrylate, butyl (meth) acrylate, and (methyl). Cyclohexyl acrylate and the like.

Examples of the polyhydric alcohol include ethylene glycol, 1,3-propanediol, 1,2-propanediol, diethylene glycol, dipropylene glycol, neopentyl glycol, 1,3-butanediol, and 1,4- Butylene glycol, 1,6-hexanediol, 1,9-nonanediol, 1,10-decanediol, 2,2,4-trimethyl-1,3-pentanediol, 3-methyl -1,5-pentanediol, neopentyl glycol hydroxypivalate, dimethylol tricyclodecane, 1,4-cyclohexane Glycol, spiro diol, hydrogenated bisphenol A, ethylene oxide addition bisphenol A, propylene oxide addition bisphenol A, trimethylolethane, trimethylolpropane, glycerol, 3-methyl Pentane-1,3,5-triol, pentaerythritol, dipentaerythritol, tripentaerythritol, glucose, and the like.

As the diisocyanate, for example, various diisocyanates of an aromatic, aliphatic or alicyclic group can be used. Specific examples of the diisocyanate include tetramethylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, 2,4-toluene diisocyanate, and 4,4-diphenyl diisocyanate. 1,5-naphthalene diisocyanate, 3,3-dimethyl-4,4-diphenyl diisocyanate, xylene diisocyanate, trimethylhexamethylene diisocyanate, 4,4-diphenylmethane Isocyanate, and such hydrides and the like.

The total content of the oligomer of the (meth)acrylic acid urethane and the (meth)acrylic acid urethane is a ratio of the monomer and the oligomer in the composition for forming a hard coat layer. The total amount of the prepolymer is preferably from 20% by weight to 90% by weight, further preferably from 25% by weight to 85% by weight, particularly preferably from 30% by weight to 80% by weight. When it is in the above range, a hard coat layer excellent in balance of hardness, flexibility, and adhesion can be formed.

The composition for forming a hard coat layer may also contain a (meth)acrylic prepolymer having a hydroxyl group. When the composition for forming a hard coat layer contains a (meth)acrylic prepolymer having a hydroxyl group, the hardening shrinkage can be reduced. In addition, since the (meth)acrylic prepolymer has a hydroxyl group, an optical layered body excellent in adhesion between a thermoplastic resin film (for example, a (meth)acrylic resin film) and a hard coat layer can be obtained. The (meth)acrylic prepolymer having a hydroxyl group is preferably a polymer obtained by polymerizing 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, for example, 2-hydroxyethyl (meth)acrylate, 2,3-dihydroxypropyl (meth)acrylate, and (methyl). A polymer obtained by polymerizing at least one monomer selected from the group consisting of 2-hydroxy-3-propenyloxypropyl acrylate and 2-propenyloxy-3-hydroxypropyl (meth)acrylate. The (meth)acrylic prepolymer having a hydroxyl group may be used singly or in combination of plural kinds.

The content ratio of the (meth)acrylic prepolymer having a hydroxyl group is preferably 5% by weight based on the total amount of the monomer, the oligomer and the prepolymer in the composition for forming a hard coat layer. 50% by weight, more preferably 10% by weight to 30% by weight. When it is in the above range, a composition for forming a hard coat layer excellent in coatability can be obtained. Further, the hardening shrinkage of the formed hard coat layer can be effectively prevented.

In the case where the composition for forming a hard coat layer contains a monomer and an oligomer and/or a prepolymer as a curable compound, the total amount of the curable compound (the total of the monomer, the oligomer, and the prepolymer) The total amount of the oligomer and the prepolymer is preferably from 20 to 90% by weight, more preferably from 25% by weight to 85% by weight, still more preferably from 30% by weight to 80% by weight. When the monomer compounding ratio in the curable compound is increased, the amount of bleeding from the component of the thermoplastic resin film tends to increase. Further, when the monomer compounding ratio in the curable compound is small, the adhesion is deteriorated.

The above composition for forming a hard coat layer preferably contains any appropriate photopolymerization initiator. Examples of the photopolymerization initiator include 2,2-dimethoxy-2-phenylacetophenone, acetophenone, benzophenone, xanthonone, 3-methylacetophenone, and 4 -Chlorobenzophenone, 4,4'-dimethoxybenzophenone, benzoin propyl ether, benzoin dimethyl ketal, N, N, N', N'-tetramethyl-4, 4'-Diaminobenzophenone, 1-(4-isopropylphenyl)-2-hydroxy-2-methylpropan-1-one, 9-oxosulfur A compound or the like.

In one embodiment, the surface of the hard coat layer opposite to the substrate layer has a concavo-convex structure. When the surface of the hard coat layer has a concavo-convex structure, the optical layered body can be provided with anti-glare properties. As a method of forming such a concavo-convex structure, for example, a method of causing the composition for forming a hard coat layer to contain fine particles is exemplified. The microparticles may be inorganic microparticles or organic microparticles. Examples of the inorganic fine particles include cerium oxide fine particles, titanium oxide fine particles, alumina fine particles, zinc oxide fine particles, tin oxide fine particles, calcium carbonate fine particles, barium sulfate fine particles, talc fine particles, kaolinite fine particles, and calcium sulfate fine particles. Examples of the organic fine particles include polymethyl methacrylate resin powder (PMMA fine particles), polyoxynoxy resin powder, polystyrene resin powder, polycarbonate resin powder, acrylic styrene resin powder, and benzoguanamine. Resin powder, melamine resin powder, polyolefin resin powder, polyester resin powder, polyamide resin powder, polyimine resin powder, polyvinyl fluoride resin powder, and the like. These fine particles may be used singly or in combination of plural kinds.

The shape of the above fine particles may take any appropriate shape. It is preferably substantially spherical, and more preferably has a substantially spherical shape with an aspect ratio of 1.5 or less. The weight average particle diameter of the fine particles is preferably from 1 μm to 30 μm, more preferably from 2 μm to 20 μm. The weight average particle diameter of the microparticles can be measured, for example, by the Coulter counter method.

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

The above composition for forming a hard coat layer may further contain any appropriate additives. Examples of the additive include a leveling agent, an anti-blocking agent, a dispersion stabilizer, a thixotropic agent, an antioxidant, an ultraviolet absorber, an antifoaming agent, a tackifier, a dispersing agent, a surfactant, a catalyst, and a filler. , lubricants, antistatic agents, etc.

The composition for forming a hard coat layer may or may not contain a solvent. Examples of the solvent include dibutyl ether, dimethoxymethane, dimethoxyethane, diethoxyethane, propylene oxide, and 1,4-two. Alkane, 1,3-dioxolane, 1,3,5-three Alkane, tetrahydrofuran, acetone, methyl ethyl ketone (MEK), diethyl ketone, dipropyl ketone, diisobutyl ketone, cyclopentanone (CPN), cyclohexanone, methylcyclohexanone, formic acid Ester, propyl formate, n-amyl formate, methyl acetate, ethyl acetate, methyl propionate, ethyl propionate, n-amyl acetate, acetamidine acetone, diacetone alcohol, methyl ethyl acetate, ethyl hydrazine Ethyl acetate, methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, 1-pentanol, 2-methyl-2-butanol, cyclohexanol, isopropanol (IPA), isobutyl acetate, methyl isobutyl ketone (MIBK), 2-octanone, 2-pentanone, 2-hexanone, 2-heptanone, 3-heptanone, ethylene glycol monoethyl ether Acid ester, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, ethylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, propylene glycol monomethyl ether, and the like. These may be used singly or in combination of plural kinds.

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

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

In the above hard coat layer, a thermoplastic resin which is eluted from the thermoplastic resin film to the composition for forming a hard coat layer may be present. In the case where a thermoplastic resin forming a thermoplastic resin film is present in the hard coat layer, it is preferred that the concentration of the thermoplastic resin continuously decreases from the side surface of the permeation layer toward the side surface of the optical function layer. In such an embodiment, the concentration of the thermoplastic resin is continuously changed, that is, the interface due to the change in the concentration of the thermoplastic resin is not formed, whereby the interface reflection can be suppressed, and an optical layered body having less interference spots can be obtained.

E. Optical functional layer

The optical functional layer is formed by coating the composition for forming an optical functional layer with a hard coat layer. The optical functional layer contains a component derived from the thermoplastic resin film which is eluted from the thermoplastic resin film to the composition for forming a hard coat layer and mixed with the hard coat layer. With respect to the component derived from the thermoplastic resin film, the component derived from the thermoplastic resin film is present in the optical functional layer at a higher concentration than the surface of the optical functional layer. The concentration distribution of the component derived from the thermoplastic resin film in the optical functional layer can be determined, for example, by using a time-of-flight secondary ion mass spectrometer (TOF-SIMS) as described in the examples. The elemental and molecular information of the surface of the optical functional layer and the oblique cut profile are detected. In this case, in the measurement region, when the average concentration of the component in the obliquely cut profile of the optical functional layer is higher than the average concentration of the surface, it is judged that the component has a higher concentration than the surface of the optical functional layer. It exists inside the optical functional layer.

Examples of the component derived from the thermoplastic resin film incorporated in the optical functional layer include an additive added to a film, a thermoplastic resin having a low molecular weight, and the like. Among them, selected from three UV absorber, benzotriazole UV absorber, benzophenone UV absorber, cyanoacrylate UV absorber, benzo UV absorber, and The ultraviolet absorbing agent of the bisazole-based ultraviolet absorbing agent has a high mobility to the composition for forming a hard coat layer, and is liable to cause whitening. In the present invention, the problem of whitening can be improved by stably holding the components derived from the thermoplastic resin film which are whitening reasons inside the optical functional layer. In one embodiment, the optical laminate of the present invention does not actually cause whitening problems even after two weeks from the production.

Since the optical functional layer can be disposed on the outermost surface of the display screen of the image display device, it is preferable to have antifouling properties. The water contact angle of the optical functional layer is, for example, 90 or more, preferably 95 or more, more preferably 100 or more, still more preferably 105 or more. Further, the hexadecane contact angle of the optical functional layer is preferably 35 or more, more preferably 40 or more, still more 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 functions 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 from 1.20 to 1.45, more preferably from 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. Further, in the present specification, the refractive index means a refractive index at a wavelength of 590 nm.

The optical functional layer forming composition 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 contains 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 (ultraviolet rays, etc.), an electron beam, or the like. It is preferred that the composition for forming an optical functional layer contains a photocurable type curable compound. The curable compound may also 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) acrylonitrile groups. When both the composition for forming a hard coat layer and the composition for forming an optical functional layer have two or more (meth) acrylonitrile groups, the adhesion between the hard coat layer and the optical functional layer can be improved. The curable compound having two or more (meth) acrylonitrile groups may be used alone or in combination of two or more kinds as described in the item D for the composition for forming a hard coat layer.

The curable compound having two or more (meth) acrylonitrile groups preferably has a hydroxyl group. When the composition for forming an optical functional layer contains such a curable compound, an optical layered body excellent in adhesion between the hard coat layer and the optical functional layer can be obtained.

The content ratio of the curable compound having two or more (meth) acrylonitrile groups is preferably a total amount of the monomer, the oligomer, and the prepolymer in the optical functional layer-forming composition. 50% by weight to 100% by weight, more preferably 60% by weight to 100% by weight, still more preferably 70% by weight to 100% by weight. When it is in the above range, an optical layered body excellent in adhesion between the hard coat layer and the optical functional layer can be obtained. Moreover, the hardening shrinkage of the optical functional layer can be effectively prevented.

Other monomers, oligomers, and prepolymers which may be contained in the composition for forming an optical functional layer are the same as those described in the item D of the composition for forming a hard coat layer.

In the present invention, a fluorine-containing compound can be preferably used as the above antifouling agent. The fluorine-containing compound imparts antifouling properties to the optical functional layer and also contributes to low refractive index of the optical functional layer. In general, the anti-fouling property is imparted to the outermost layer of the image display device by using a polyfluorene-based antifouling agent, and scratch resistance and the like are also imparted. However, in the present invention, fluorine-based prevention can be used. The above-mentioned component derived from the thermoplastic resin film is stably held inside the optical functional layer by the stain. The fluorine-containing compound used in the present invention may not contain hydrazine, and for example, does not contain a decane bond.

The fluorine-containing compound is preferably a fluoroalkyl group, a fluoroalkenyl group or a fluoroalkyl group having 1 to 10 carbon atoms in the molecule, more preferably a perfluoroalkyl group having a carbon number of 1 to 10, a perfluoroalkenyl group or Perfluorinated alkyl. According to the fluorine-containing compound having such a group, the bleeding from the component of the thermoplastic resin film can be suppressed, and the component derived from the thermoplastic resin film can be 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 amount of the ether bond is within the above range, excellent antifouling properties can be obtained.

In one embodiment, the fluorine-containing compound may have a perfluoroalkenyl group such as a perfluoroalkyl group such as a trifluoromethyl group, a tetrafluorovinyl group or a perfluoroisopropyl group, and/or a heptafluorononyl group and an ether bond.

In another embodiment, the fluorine-containing compound may have a perfluoroalkylene oxide group such as a tetrafluorooxiranyl group or a difluoroacetoxy group. In this embodiment, the fluorine-containing compound may be, for example, poly(difluoroformaldehyde), poly(tetrafluoroethylene oxide), poly(tetrafluoroethylene oxide-co-difluoroformaldehyde) or the like (perfluorocarbon ring). Oxytomane).

The fluorine-containing compound may optionally have any suitable reactive group as needed. The reactive group is represented by a (meth) acrylonitrile group. In the case of having a reactive group, the fluorine-containing compound is fixed in the optical functional layer, so that its 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 can be 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 from 300 to 8,000 or more, more preferably from 500 to 5,000 or from 100,000 to 500,000. In the case of a fluorine-containing compound having a relatively small molecular weight, it is presumed that since the migration property to the surface is excellent, a thin layer of the compound can be preferably formed on the surface of the optical functional layer, whereby the component derived from the thermoplastic resin film can be suppressed. Exudation. On the other hand, in the case of a fluorine-containing compound having a relatively large molecular weight, it is presumed that the component can be preferably prevented from oozing out due to the compatibility or stable dispersion of the components from the thermoplastic resin film inside the optical functional layer.

The amount of the fluorine-containing compound to be formulated is relative to the composition for forming an optical functional layer. The total solid content is preferably from 0.5% by weight to 30% by weight, more preferably from 1% by weight to 25% by weight, still more preferably from 1.5% by weight to 20% by weight.

The above optical functional layer forming composition preferably contains any appropriate photopolymerization initiator. Further, a solvent and any appropriate additives may be further included as needed. Specific examples of the photopolymerization initiator, the solvent, and the additive include the same as those of the user of the composition for forming a hard coat layer.

As the low refractive index fine particles, any appropriate fine particles can be used. The refractive index of the low refractive index fine particles is preferably from 1.20 to 1.44, more preferably from 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 or porous fine particles. Examples of the material for forming the fine particles having voids include a metal, a metal oxide, a resin, and the like. Among them, hollow cerium oxide microparticles can be preferably used. For the hollow ceria particles, a ketone coupling agent may be used to introduce a lipophilic group or a reactive group to the surface.

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

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

Regarding the details of the low-refractive-index microparticles, the descriptions of 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 based on the total amount of the curable compound (the total amount of the monomer, the oligomer and the prepolymer). ~200% by weight, further preferably 60% by weight 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. Optics When the 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. Method for manufacturing optical laminate

The method for producing an optical layered body of the present invention comprises: forming a first coating layer on a thermoplastic resin film by applying a composition for forming a hard coat layer; heating the first coating layer and applying the first coating layer to the first coating layer The composition for forming an optical functional layer is coated on the cloth layer to form a second coating layer. The hard coat layer is preferably formed by subjecting the heated first coating layer to a hardening treatment. Similarly, the optical functional layer is preferably formed by subjecting the second coating layer to a hardening treatment. The formation and hardening treatment of the second coating layer is usually performed after the curing treatment of the first coating layer, but the first coating layer may be formed on the first coating layer after heating, and the first and the first layers may be simultaneously performed. 2 hardening treatment of the coating layer.

As a coating method of the composition for forming a hard coat layer or the composition for forming an optical functional layer, any appropriate method can be employed. For example, a bar coating method, a roll coating method, a gravure coating method, a bar coating method, a slit coating method, a curtain coating method, a spray coating method, and a corner wheel coating method are mentioned. Bufa.

The heating temperature of the first coating layer is set to an appropriate temperature depending on the composition of the composition for forming a hard coat layer, and is preferably set to be lower than the glass transition temperature of the resin contained in the thermoplastic resin film. When heating is performed at a temperature lower than the glass transition temperature of the resin contained in the thermoplastic resin film, an optical layered body 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 heating is performed at the temperature of the above range, the monomer, the oligomer, and/or the prepolymer in the composition for forming a hard coat layer penetrates and diffuses well into the thermoplastic resin film. After the above-described heating and subsequent hardening treatment, the permeation layer described in the above item C is formed from the infiltrated hard-coat layer forming composition and the thermoplastic resin film forming material. As a result, an optical layered body in which the adhesion between the thermoplastic resin film and the hard coat layer is excellent and the interference spots are suppressed can be obtained. Further, when the composition for forming a hard coat layer contains a solvent, the coating can be applied by the above heating. The composition for forming a hard coat layer is dried. Further, regarding the thickness of the permeation layer, for example, the thickness of the permeation layer can be increased by setting the heating temperature or the like higher in the above range.

In one embodiment, the heating temperature may be set depending on the content ratio of the curable compound having two or more (meth)acryl fluorenyl groups contained in the composition for forming a hard coat layer and the monofunctional monomer. The more the curable compound and/or the monofunctional monomer having two or more (meth) acrylonitrile groups contained in the composition for forming a hard coat layer, the lower the heating temperature (for example, 80 ° C to 100 ° C) °C) An optical laminate having excellent adhesion and suppressing interference spots is obtained, and a manufacturing process with a small environmental load and high efficiency is obtained.

As the hardening treatment, any appropriate hardening treatment can be employed. Representatively, the hardening treatment can be carried out by ultraviolet irradiation. The cumulative amount of light by ultraviolet irradiation is preferably from 200 mJ to 400 mJ.

[Examples]

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

(1) Refractive index

The Abbe refractometer (trade name: DR-M2/1550) manufactured by Atago Co., Ltd. was used, and monobromonaphthalene was selected as an intermediate liquid for measurement.

(2) Thickness of the permeable layer

On the side of the base material layer of the laminate having the structure of [base material layer/permeation layer/hard coat layer] produced in the examples and the comparative examples, a black acrylic plate (Mitsubishi) was attached via an acrylic adhesive having a thickness of 20 μm. Made by Liyang Company, thickness 2mm). Then, using Intensified Multichannel Photodetector (manufactured by Otsuka Electronics Co., Ltd., trade name: MCPD3700), the reflection spectrum of the hard coat layer was measured under the following conditions, and evaluated according to the peak position of the FFT (Fast Fourier Transformation) spectrum. (Thick coating + permeable layer) thickness. Furthermore, the refractive index is measured using the above (1). value.

‧Refracting spectrum measurement conditions

Reference: Mirror

Algorithm: FFT method

Calculated wavelength: 450nm~850nm

‧Test conditions

Exposure time: 20ms

Lamp gain: normal

Cumulative number: 10 times

‧FFT method

Range of film thickness: 2~15μm

Film thickness decomposition ability: 24nm

Further, the thickness of the hard coat layer was evaluated by the above-described reflection spectrum measurement for the laminate described below.

‧Laminar body: A PET (polyethylene terephthalate) substrate (manufactured by Toray Industries, Inc., trade name: U48-3, refractive index: 1.60) was used as the substrate film, and the coating layer was applied. The heating temperature was 60 ° C, and the same procedure as in Example 1 was carried out.

Further, in the PET substrate used for the laminate, since the composition for forming a hard coat layer did not permeate, the thickness of only the hard coat layer was 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.

The positive value calculated from ((thickness of the hard coat layer + permeable layer)) - (the thickness of the (hard coat layer)) is set as the thickness of the permeable layer.

(3) Evaluation of whitening

The base material layer side of the laminate having the structure of [base material layer, permeation layer/hard coat layer/low refractive index layer] produced in the examples and the comparative examples was adhered to the acrylic layer having a thickness of 20 μm. A sample for evaluation was prepared by sticking a black acrylic plate (10 cm × 10 cm) to the agent. The prepared evaluation samples (each of the three samples) were placed in a humidified environment tester at 60 ° C and 90%, and after three days, the samples were taken out to confirm the presence or absence of whitening. Furthermore, the evaluation criteria for whitening are as follows.

[evaluation benchmark]

○: no whitening in all samples

△: whitening was found in samples 1~2

×: whitening was found in all the samples

××: Significant whitening was observed in all the samples.

(4) Contact angle

A contact angle measuring device (manufactured by Kyowa Interface Chemical Co., Ltd., product name "Drop Master DM700") was used, and 1 ml of water or hexadecane was added dropwise to determine the contact angle after 3 seconds.

(5) Determination of concentration distribution

The inside of the film is exposed by precision oblique cutting as shown in FIG. Using a microscope, it was confirmed that the surface of the low refractive index layer and the obliquely cut section existed in the measurement region, and the surface of the low refractive index layer was obtained by using TOF-SIMS (manufactured by ION-TOF, product name "TOF-SIMS5"). Positive secondary ion line distribution inside the coating.

<Manufacturing Example 1> Production of Substrate Film A

100 parts by weight of the ruthenium iodide resin described in Production Example 1 of JP-A-2010-284840, and the like, at a temperature of 220 ° C, using a biaxial kneading machine. A UV absorber (manufactured by Adeka Co., Ltd., trade name: T-712, molecular weight 699) was mixed in an amount of 0.62 part by weight to prepare resin pellets. The obtained resin pellets were dried at 100.5 kPa and 100 ° C for 12 hours, and extruded in a film form at a mold temperature of 270 ° C from a T-die to form a film (thickness: 160 μm). Further, the film was stretched in a conveyance direction (thickness: 80 μm) in an environment of 150 ° C, and then extended in a direction orthogonal to the film conveyance direction in an environment of 150 ° C to obtain a substrate film A having a thickness of 40 μm. ((Meth)acrylic resin film). The transmittance of light having a wavelength of 380 nm of the obtained base film A was 8.5%, the in-plane retardation Re was 0.4 nm, and the thickness direction retardation Rth was 0.78 nm. Further, the obtained substrate film A had a moisture permeability of 61 g/m ² ‧24 hr. Further, regarding the light transmittance, a spectrophotometer (device name; U-4100) manufactured by Hitachi High-Tech Co., Ltd. was used, and a transmittance spectrum was measured in a wavelength range of 200 nm to 800 nm, and a wavelength of 380 nm was read. Transmittance rate. In addition, the phase difference value was measured at a wavelength of 590 nm and 23 ° C using the trade name "KOBRA21-ADH" manufactured by Oji Scientific Instruments Co., Ltd. The moisture permeability was measured by a method according to JIS K 0208 at a temperature of 40 ° C and a relative humidity of 92%.

<Manufacturing Example 2> Preparation of hollow cerium oxide microparticles

A cerium oxide-based hollow fine particle dispersion sol (manufactured by Catalyst Chemical Industries, Ltd., trade name: Thrulya 1420, average particle diameter: 60 nm, concentration: 20.5 wt%, dispersion medium: isopropyl alcohol, particle refractive index: 1.30) was used as a low refractive index component. . To the 100 g of the sol, 1.88 g of γ-methylpropenyloxypropyltrimethoxydecane was mixed. With respect to 100 g of the obtained organosol, a 28% aqueous ammonia solution was added in an amount of 400 ppm of ammonia, and stirred at 40 ° C for 5 hours, thereby obtaining a surface-treated cerium oxide-based hollow fine particle-dispersed sol (solid matter) Composition 20.3%).

<Example 1>

60 parts of acrylamide urethane oligomer (manufactured by Daicel-Cytec, trade name: KRM7804), and pentaerythritol triacrylate (PETA) (manufactured by Osaka Organic Chemical Industry Co., Ltd., trade name: Viscoat #300) 40 parts, adjusted 0.5 parts of a flat agent (manufactured by DIC Corporation, trade name: PC4100) and 3 parts of a photopolymerization initiator (manufactured by Ciba Japan Co., Ltd., trade name: Irgacure 907) were mixed, and methyl group was used in such a manner that the solid content concentration became 50%. The butyl ketone was diluted to prepare a composition for forming a hard coat layer.

The obtained coating layer-forming composition was applied onto the base film A obtained in Production Example 1 to form a first coating layer, and the first coating layer was heated at 100 ° C for 1 minute. The first coating layer after heating is irradiated with ultraviolet rays having a cumulative light amount of 300 mJ/cm ² by a high-pressure mercury lamp to cure the first coating layer, thereby obtaining a laminate having a structure of [base material layer/permeable layer/hard coat layer]. body.

50 parts of pentaerythritol triacrylate (PETA) (manufactured by Osaka Organic Chemical Industry Co., Ltd., trade name: Viscoat #300), and 246 parts of the ceria-based hollow fine particle dispersion sol obtained in Production Example 2 (based on the solid content) 50 parts), a tetrafunctional fluorine-containing compound (manufactured by Solvay Specialty Polymers Japan Co., Ltd., trade name: MT70, 80% solid content, weight average molecular weight of the main chain of 2,000, and an overall weight average molecular weight of 3,000 (tetrafluoroethylene-co-difluorocarbaldehyde)) 3.75 parts (3 parts by solid content) and 5 parts of photopolymerization initiator (manufactured by Ciba Japan Co., Ltd., trade name: Irgacure 2959) were mixed. The composition for forming a low refractive index layer was prepared by diluting with methyl isobutyl ketone so that the solid content concentration was 2%.

The surface of the hard coat layer having the laminate of the structure of the base material layer/permeation layer/hard coat layer obtained as described above is coated with the composition for forming a low refractive index layer so that the thickness after drying becomes 100 nm. The second coating layer was formed and heated at 60 ° C for 1 minute. Then, the second coating layer is irradiated with ultraviolet rays having a cumulative light amount of 300 mJ/cm ² by a high-pressure mercury lamp to harden the second coating layer, thereby obtaining [substrate layer/permeable layer/hard coat layer/low refractive index layer). The optical laminate 1 of the composition.

<Example 2>

In addition, the amount of the pentaerythritol triacrylate was adjusted to 40 parts, and the amount of the fluorine-containing compound was adjusted to 12.5 parts (10 parts by weight of the solid content) to prepare a composition for forming a low refractive index layer. The optical layered body 2 was obtained in the same manner as in Example 1.

<Example 3>

The blending amount of pentaerythritol triacrylate was 40 parts, and the blending amount of 14.3 parts (10 parts by solid content) was used, and the weight average molecular weight of the main chain was 1,500, and the weight average molecular weight of the whole was 3,000. Functional poly(tetrafluoroethylene-co-difluoro (Formaldehyde) (manufactured by Solvay Specialty Polymers Japan Co., Ltd., trade name: AD1700, solid content: 70%) was obtained in the same manner as in Example 1 except that a composition for forming a low refractive index layer was prepared as a fluorine-containing compound. Optical laminate 3.

<Example 4>

The blending amount of the pentaerythritol triacrylate is 40 parts, and the compounding amount of 66.7 parts (10 parts by weight of the solid content) is a polyfunctional fluorine-based polymer having a weight average molecular weight of 150,000 (manufactured by Daikin Co., Ltd., The optical layered body 4 was obtained in the same manner as in Example 1 except that the composition for forming a low refractive index layer was prepared as a fluorine-containing compound as a fluorine-containing compound.

<Example 5>

The blending amount of pentaerythritol triacrylate was 30 parts, and a polyfunctional fluorine-based polymer having a weight average molecular weight of 150,000 (manufactured by Daikin Co., Ltd.) was used in an amount of 133.4 parts (20 parts by weight of the solid content). The optical layered body 5 was obtained in the same manner as in Example 1 except that the composition for forming a low refractive index layer was prepared as a fluorine-containing compound as a fluorine-containing compound.

<Example 6>

The blending amount of pentaerythritol triacrylate was 40 parts, and a fluorine-containing trifunctional (meth)acrylic monomer (manufactured by Kyoeisha Chemical Co., Ltd., trade name: LINC-3A, molecular weight = 10 parts) was used in an amount of 10 parts. 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 as a fluorine-containing compound.

<Example 7>

The blending amount of pentaerythritol triacrylate was 30 parts, and a fluorine-containing trifunctional (meth)acrylic monomer (manufactured by Kyoeisha Chemical Co., Ltd., trade name: LINC-3A, molecular weight = 20 parts) was used in an amount of 20 parts. 728) An optical layered body 7 was obtained in the same manner as in Example 1 except that a composition for forming a low refractive index layer was prepared as a fluorine-containing compound.

<Example 8>

The blending amount of pentaerythritol triacrylate was set to 40 parts, and a polyfunctional polyfluorene-based compound having an acrylic group and an alkoxyalkyl group as a branched chain was used in an amount of 10 parts (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: An optical layered body obtained in the same manner as in Example 1 except that a composition for forming a low refractive index layer was prepared in place of the fluorine-containing compound, X-20-1048, an acrylic group/alkoxyalkylene group = 1). 8.

<Example 9>

The blending amount of pentaerythritol triacrylate was set to 40 parts, and a polyfunctional polyfluorene-based compound having an acrylic group and an alkoxyalkyl group as a branched chain was used in an amount of 10 parts (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: Optical layered body obtained in the same manner as in Example 1 except that the composition for forming a low refractive index layer was prepared in place of the fluorine-containing compound, X-20-1050, acryl-based/alkoxyalkylene group = 5) 9.

<Example 10>

100 parts of dipentaerythritol hexaacrylate (DPHA) (manufactured by Shin-Nakamura Chemical Co., Ltd., trade name: A-DPH), leveling agent (manufactured by DIC Corporation, trade name: PC4100), 0.5 parts, and photopolymerization initiator (Ciba Japan) (manufactured by the company, trade name: Irgacure 907), three parts were mixed, and the composition of the hard coat layer was prepared by diluting with methyl isobutyl ketone so that the solid content concentration was 50%, and The optical laminate 10 was obtained in the same manner as in Example 1.

<Example 11>

100 parts of dipentaerythritol hexaacrylate (DPHA) (manufactured by Shin-Nakamura Chemical Co., Ltd., trade name: A-DPH), leveling agent (manufactured by DIC Corporation, trade name: PC4100), 0.5 parts, and photopolymerization initiator (Ciba Japan) (manufactured by the company, trade name: Irgacure 907), three parts were mixed, and the composition of the hard coat layer was prepared by diluting with methyl isobutyl ketone so that the solid content concentration was 50%, and The optical laminate 11 was obtained in the same manner as in Example 2.

<Example 12>

100 parts of dipentaerythritol hexaacrylate (DPHA) (manufactured by Shin-Nakamura Chemical Co., Ltd., trade name: A-DPH), leveling agent (manufactured by DIC Corporation, trade name: PC4100), 0.5 parts, and photopolymerization initiator (Ciba Japan) (manufactured by the company, trade name: Irgacure 907), three parts were mixed, and the composition of the hard coat layer was prepared by diluting with methyl isobutyl ketone so that the solid content concentration was 50%, and The optical laminate 12 was obtained in the same manner as in Example 4.

<Comparative Example 1>

The blending amount of pentaerythritol triacrylate was 40 parts, and a polyfunctional fluorine-modified polyfluorene-based compound (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: X-40-2729, refractive index) was used in an amount of 10 parts. The optical layered product C1 was obtained in the same manner as in Example 1 except that the composition for forming a low refractive index layer was prepared as a fluorine-containing compound.

<Comparative Example 2>

The blending amount of pentaerythritol triacrylate was set to 40 parts, and the terminal methacrylic group-modified polydimethyl methoxy hydride (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: X-22-174DX) was used in an amount of 10 parts. The optical layered product C2 was obtained in the same manner as in Example 1 except that the composition for forming a low refractive index layer was prepared instead of the fluorine-containing compound.

<Comparative Example 3>

The amount of the pentaerythritol triacrylate was adjusted to 40 parts, and a polyfluorene-based compound (manufactured by Kyoeisha Chemical Co., Ltd., trade name: KL401) was used in an amount of 10 parts in place of the fluorine-containing compound to prepare a low refractive index. An optical layered product C3 was obtained in the same manner as in Example 1 except for the composition for layer formation.

<Comparative Example 4>

The blending amount of pentaerythritol triacrylate was set to 40 parts, and the terminal methacrylic acid-modified polydimethyl methoxy hydride (manufactured by Shin-Etsu Chemical Co., Ltd.) was used in an amount of 10 parts. The optical layered product C4 was obtained in the same manner as in Example 1 except that the composition for forming a low refractive index layer was prepared instead of the fluorine-containing compound.

<Comparative Example 5>

The blending amount of pentaerythritol triacrylate was set to 40 parts, and the terminal methacrylic group-modified polydimethyl decane (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: X-22-164B) was used in an amount of 10 parts. The optical layered product C5 was obtained in the same manner as in Example 1 except that the composition for forming a low refractive index layer was prepared instead of the fluorine-containing compound.

<Comparative Example 6>

The blending amount of pentaerythritol triacrylate was set to 40 parts, and the terminal methacrylic group-modified polydimethyl decane (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: X-22-164C) was used in an amount of 10 parts. The optical layered product C6 was obtained in the same manner as in Example 1 except that the composition for forming a low refractive index layer was prepared instead of the fluorine-containing compound.

<Comparative Example 7>

The amount of the pentaerythritol triacrylate was adjusted to 40 parts, and a low-refraction was prepared by using a 5-functional polyfluorene-based compound (manufactured by Evonik Co., Ltd., trade name: tego rad 2011) in an amount of 10 parts in place of the fluorine-containing compound. An optical layered product C7 was obtained in the same manner as in Example 1 except that the composition for forming a layer was formed.

<Comparative Example 8>

100 parts of dipentaerythritol hexaacrylate (DPHA) (manufactured by Shin-Nakamura Chemical Co., Ltd., trade name: A-DPH), leveling agent (manufactured by DIC Corporation, trade name: PC4100), 0.5 parts, and photopolymerization initiator (Ciba Japan) The product manufactured by the company, trade name: Irgacure 907) was mixed and diluted with methyl isobutyl ketone so that the solid content concentration became 50%, and a composition for forming a hard coat layer was prepared, and The optical laminate C8 was obtained in the same manner as in Example 1.

The evaluation results of the optical layered bodies obtained in the above examples and comparative examples are shown in Table 1. Further, the optical laminate obtained in Example 1 and Comparative Example 1 and Comparative Example 2 will be used. The distribution of the component derived from the (meth)acrylic resin film in the low refractive index layer (after 72 hours after the production) was examined and found in Fig. 3 .

It is clear from Table 1 that the optical laminate of the present invention remarkably improves the problem of whitening. Further, according to the graph of Fig. 3, in the optical layered body of the first embodiment, the component derived from the thermoplastic resin film is present in the lower portion of the low refractive index layer at a higher concentration than the surface of the low refractive index layer.

Further, the precipitate generated on the surface of the low refractive index layer of the optical laminate of the comparative example was analyzed, and as a result, the precipitate contained the third substrate added to the substrate film A. It is a UV absorber and a resin component containing a pentyleneimine structural unit. Further, when Comparative Example 1 was compared with Comparative Example 8, the whiteness of Comparative Example 1 was slight. According to the above, it is also possible to reduce whitening by reducing the blending ratio of the monomers in the composition for forming a hard coat layer.

[Industrial availability]

The optical laminate of the present invention can be preferably used for an image display device. The optical laminate of the present invention can be preferably used as a protective material for a front panel or a polarizing element of an image display device, and particularly preferably as a front panel of a liquid crystal display device (in which a three-dimensional liquid crystal display device).

10, 10'‧‧‧ substrate layer

20‧‧‧permeable layer

30, 30'‧‧‧ Hard coating

40, 40'‧‧‧ optical functional layer

100,200‧‧‧Optical laminate

A‧‧‧ junction

B‧‧‧ Junction

Claims (8)

An optical layered body comprising: a base material layer formed of a thermoplastic resin film; a hard coat layer formed by coating a composition for forming a hard coat layer on a thermoplastic resin film; and a permeation layer which is a hard coat layer The composition for forming is formed between the base material layer and the hard coat layer by infiltrating into the thermoplastic resin film; and the optical functional layer is formed by coating the composition for forming an optical functional layer with a hard coat layer; and the optical functional layer contains The component derived from the thermoplastic resin film eluted from the thermoplastic resin film is present in the optical functional layer at a higher concentration than the surface of the optical functional layer, and the hard coat layer forming composition contains a single The body and the oligomer and/or the prepolymer are used as the curable compound, and the total amount of the oligomer and the prepolymer relative to the total amount of the curable compound is 20% by weight to 90% by weight. The optical layered product according to claim 1, wherein the thermoplastic resin film is a (meth)acrylic resin film. The optical laminate according to claim 1, wherein the component derived from the thermoplastic resin film is selected from the group consisting of UV absorber, benzotriazole UV absorber, benzophenone UV absorber, cyanoacrylate UV absorber, benzo UV absorber and At least one ultraviolet absorber of a diazole-based ultraviolet absorber. The optical layered product according to claim 1, 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 of claim 4, wherein the antifouling agent is a fluorine-containing compound. The optical layered product according to claim 1, wherein the composition for forming a hard coat layer contains a curable compound having two or more (meth) acrylonitrile groups. A polarizing film comprising the optical layered body according to any one of claims 1 to 6. An image display device comprising the optical layered body according to any one of claims 1 to 7.