WO2015068483A1 - 光学積層体 - Google Patents

光学積層体 Download PDF

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Publication number
WO2015068483A1
WO2015068483A1 PCT/JP2014/075277 JP2014075277W WO2015068483A1 WO 2015068483 A1 WO2015068483 A1 WO 2015068483A1 JP 2014075277 W JP2014075277 W JP 2014075277W WO 2015068483 A1 WO2015068483 A1 WO 2015068483A1
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Prior art keywords
meth
coat layer
hard coat
layer
acrylic resin
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PCT/JP2014/075277
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English (en)
French (fr)
Japanese (ja)
Inventor
周作 柴田
岸　敦史
浩貴 倉本
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日東電工株式会社
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Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Priority to CN201480061007.2A priority Critical patent/CN105705968B/zh
Priority to KR1020167011314A priority patent/KR102363489B1/ko
Priority to KR1020217012619A priority patent/KR102366883B1/ko
Publication of WO2015068483A1 publication Critical patent/WO2015068483A1/ja

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/16—Optical coatings produced by application to, or surface treatment of, optical elements having an anti-static effect, e.g. electrically conducting coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/536—Hardness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2551/00—Optical elements

Definitions

  • 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, an optical laminate including a base film and a hard coat layer is used for the purpose of protecting the surface of the image display device.
  • a base film of the optical laminate triacetyl cellulose (TAC) is typically used (Patent Document 1).
  • TAC triacetyl cellulose
  • the base film made of TAC has high moisture permeability. Therefore, when an optical laminate including such a substrate film is used in an LCD, moisture is transmitted through the optical laminate under high temperature and high humidity, resulting in a problem that the optical characteristics of the polarizer are deteriorated.
  • LCDs are also frequently used for outdoor use devices such as car navigation systems and personal digital assistants. Even under severe conditions such as high temperature and high humidity, There is a need for a reliable LCD that does not cause problems.
  • the hard coat layer-forming composition is allowed to penetrate into the base film by applying and heating the hard coat layer-forming composition on the low moisture-permeable acrylic base film.
  • Optical laminated bodies with improved adhesion between the base film and the hard coat layer have been proposed (for example, Patent Document 2 and Patent Document 3).
  • Patent Document 2 and Patent Document 3 Optical laminated bodies with improved adhesion between the base film and the hard coat layer.
  • the base film may be deformed (for example, contracted). There is.
  • the adhesiveness can be improved by infiltrating the base film with the composition for forming a hard coat layer by heating at a relatively low temperature, but the hardness is insufficient. There is a case.
  • the present invention provides an optical laminate that can achieve both the adhesion and hardness of the hard coat layer and the base material layer, and can be produced without requiring heating at a temperature that can cause deformation of the base material film. provide.
  • the optical layered body of the present invention includes a base layer formed from a (meth) acrylic resin film, and a hard coat formed by coating the (meth) acrylic resin film with a composition for forming a hard coat layer And a permeation layer formed by permeating the (meth) acrylic resin film between the layer and the base material layer and the hard coat layer.
  • the hard coat layer-forming composition contains a curable compound (A) containing one or more radically polymerizable unsaturated groups and an aromatic ring, and two or more radically polymerizable unsaturated groups.
  • the content ratio of the curable compound (A) to the total curable compound in the hard coat layer forming composition is 10% by weight to 60% by weight. In one embodiment, the total content of the curable compound (A) and the monofunctional monomer (C) with respect to the total curable compound in the hard coat layer forming composition is 20% by weight to 70% by weight. . In one embodiment, the said composition for hard-coat layer formation contains the sclerosing
  • the monofunctional monomer (C) has a hydroxyl group.
  • the (meth) acrylic resin forming the (meth) acrylic resin film has a structural unit that exhibits positive birefringence and a structural unit that exhibits negative birefringence.
  • the (meth) acrylic resin forming the (meth) acrylic resin film has a weight average molecular weight of 10,000 to 500,000.
  • the surface of the hard coat layer opposite to the osmotic layer has a concavo-convex structure.
  • an antireflection layer is further provided on the opposite side of the hard coat layer from the permeation layer.
  • a polarizing film is provided.
  • This polarizing film contains the said optical laminated body.
  • an image display device includes the optical laminate.
  • the manufacturing method of an optical laminated body includes applying a hard coat layer forming composition on a (meth) acrylic resin film to form a coating layer, and heating the coating layer at 50 ° C. or more and less than 100 ° C.
  • the hard coat layer-forming composition contains a curable compound (A) containing one or more radically polymerizable unsaturated groups and an aromatic ring, and two or more radically polymerizable unsaturated groups.
  • both the adhesion and hardness between the base layer and the hard coat layer are excellent, and the base material An optical laminate is obtained that can be manufactured without the need for heating at a temperature that can cause deformation of the film.
  • (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
  • FIG. 1A is a schematic cross-sectional view of an optical laminate according to a preferred embodiment of the present invention
  • 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 (meth) acrylic-type resin film, the osmosis
  • the hard coat layer 30 is formed by applying a composition for forming a hard coat layer to a (meth) acrylic resin film.
  • the permeation layer 20 is formed by permeating the (meth) acrylic resin film with the hard coat layer forming composition.
  • the composition for forming a hard coat layer penetrates into the (meth) acrylic resin film in this way, the composition for forming the hard coat layer reaches (penetrates) in the (meth) acrylic resin film. This is the part that did not.
  • Boundary A shown in FIGS. 1A and 1B is a boundary defined by the hard coat layer forming composition coating surface of the (meth) acrylic resin film.
  • 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 ′ (ie, (meta)) in the optical laminate 200 in which the osmotic layer is not formed.
  • This is the boundary between the acrylic resin film) and the hard coat layer 30 '.
  • (meth) acryl means acryl and / or methacryl.
  • the penetrating layer 20 is formed by penetrating the (meth) acrylic resin film with the hard coat layer forming composition in the optical laminate 100. That is, the osmotic layer 20 is a portion where a hard coat layer component is present in the (meth) acrylic resin film.
  • the thickness of the osmotic layer 20 is, for example, 1.0 ⁇ m or more.
  • permeation layer 20 is the thickness of the part in which the hard-coat layer component exists in the said (meth) acrylic-type resin film, Specifically, a hard-coat layer in a (meth) acrylic-type resin film. 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).
  • any appropriate other layer may be disposed outside the hard coat layer 30 as necessary.
  • the other layers are typically disposed via an adhesive layer (not shown).
  • the (meth) acrylic resin forming the (meth) acrylic resin film may be eluted in the hard coat layer forming composition, and the (meth) acrylic resin may be present in the hard coat layer. .
  • FIG. 2 is a schematic cross-sectional view of an optical laminate according to another embodiment of the present invention.
  • the optical layered body 300 further includes a block layer 40 on the opposite side of the hard coat layer 30 from the osmotic layer 20.
  • the (meth) acrylic resin forming the (meth) acrylic resin film elutes in the hardcoat layer forming composition, and the hardcoat layer forming composition is the (meth) acrylic resin. And by causing phase separation.
  • the optical laminate including the block layer 40 is excellent in hardness.
  • the amplitude of the reflection spectrum of the hard coat layer in the wavelength region of 500 nm to 600 nm of the optical layered body of the present invention is preferably 0.5% or less, more preferably 0.3% or less, and still more preferably 0.8. 1% or less. According to the present invention, it is possible to obtain an optical laminated body having a small reflection spectrum amplitude, that is, having little interference unevenness.
  • the pencil hardness of the hard coat layer surface of the optical layered body of the present invention is preferably 2H or more, more preferably 3H or more.
  • the optical laminate of the present invention is applied to, for example, a polarizing film (also referred to as a polarizing plate).
  • a polarizing film also referred to as a polarizing plate.
  • the optical laminate of the present invention is provided on one or both sides of a polarizer in a polarizing film, and can be suitably used as a protective material for the polarizer.
  • the base material layer is formed of a (meth) acrylic resin film. More specifically, as described above, when the base layer is coated with the composition for forming a hard coat layer on the (meth) acrylic resin film, in the (meth) acrylic resin film, This is the part where the forming composition did not reach (penetrate).
  • 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.
  • 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.
  • the light transmittance at a wavelength of 380 nm of the (meth) acrylic resin film 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 (meth) acrylic resin film is preferably 10 nm or less, more preferably 7 nm or less, still more preferably 5 nm or less, particularly preferably 3 nm or less, and most preferably 1 nm or less.
  • the thickness direction retardation Rth of the (meth) acrylic 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. It is as follows. 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.
  • a (meth) acrylic resin film having in-plane retardation and thickness direction retardation in such a range can be obtained by using, for example, a (meth) acrylic resin having a glutarimide structure described later.
  • nx is the refractive index in the slow axis direction of the (meth) acrylic resin film
  • ny is the refractive index in the fast axis direction of the (meth) acrylic resin film
  • nz is the (meth) acrylic system. It is the refractive index in the thickness direction of the resin film
  • d (nm) is the thickness of the (meth) acrylic resin film.
  • the slow axis refers to the direction in which the in-plane refractive index is maximized
  • the fast axis refers to the direction perpendicular to the slow axis in the plane.
  • Re and Rth are measured using light having a wavelength of 590 nm.
  • any appropriate (meth) acrylic resin can be adopted as the (meth) acrylic resin.
  • 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).
  • poly (meth) acrylate such as polymethyl methacrylate, methyl methacrylate- (meth) acrylic acid copolymer, methyl methacrylate- (meth) acrylic acid ester copolymer, methyl methacrylate-acrylic acid
  • 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, more preferably 30,000 to 300,000, and still more preferably 50,000 to 200,000. If a weight average molecular weight is in the said range, it is excellent in compatibility with the composition for hard-coat layer formation. On the other hand, if the weight average molecular weight is too small, the mechanical strength of the 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.
  • 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.
  • 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.
  • 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).
  • a (meth) acrylic resin having a lactone ring structure or a glutarimide structure is preferably used as the (meth) acrylic resin.
  • 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 include, for example, JP-A-2006-309033, JP-A-2006-317560, JP-A-2006-328329, and JP-A-2006-328329.
  • 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).
  • R 1 and R 2 are each independently hydrogen or an alkyl group having 1 to 8 carbon atoms
  • 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.
  • R 4 and R 5 are each independently hydrogen or an alkyl group having 1 to 8 carbon atoms
  • 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.
  • R 7 is hydrogen or an alkyl group having 1 to 8 carbon atoms
  • R 8 is an aryl group having 6 to 10 carbon atoms.
  • 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 ⁇ , ⁇ -ethylenically unsaturated carboxylic acid such as maleic anhydride, itaconic acid, itaconic anhydride, crotonic acid, fumaric acid and citraconic acid.
  • R 4 and R 5 are each independently hydrogen or a methyl group
  • R 6 is hydrogen or a methyl group
  • R 4 is hydrogen
  • R 5 is a methyl group
  • 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, ⁇ -methylstyrene, and more preferably styrene as the aromatic vinyl unit represented by the general formula (3).
  • aromatic vinyl unit 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.
  • 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.
  • 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.
  • 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.
  • 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 (meth) acrylic resin film contains an ultraviolet absorber.
  • 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 (meth) acrylic resin. .
  • 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.
  • the content of the ultraviolet absorber is less than 0.1 parts by weight, the ultraviolet blocking effect tends to be insufficient.
  • 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
  • the (meth) acrylic resin film may contain any appropriate additive depending on the purpose.
  • 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.
  • (meth) acrylic-type resin film Although it does not specifically limit as a manufacturing method of the said (meth) acrylic-type resin film,
  • (meth) acrylic-type resin, an ultraviolet absorber, and other polymers, additives, etc. as needed are sufficiently mixed by any appropriate mixing method to obtain a thermoplastic resin composition in advance, and then this can be formed into a film.
  • a (meth) acrylic resin, an ultraviolet absorber, and if necessary, other polymers and additives are mixed in separate solutions to form a uniform mixed solution, and then film forming May be.
  • 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.
  • 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.
  • the film forming method examples 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.
  • melt extrusion method examples include a T-die method and an inflation method.
  • the molding temperature is preferably 150 to 350 ° C, more preferably 200 to 300 ° C.
  • 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.
  • 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 (meth) acrylic resin film may be either an unstretched film or a stretched film as long as the desired retardation is obtained.
  • a stretched film either a uniaxially stretched film or a biaxially stretched film may be used.
  • 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.
  • the stretching ratio is preferably 1.1 to 3 times, more preferably 1.3 to 2.5 times.
  • the mechanical properties such as the film elongation, tear propagation strength, and fatigue resistance can be greatly improved.
  • the above (meth) acrylic 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
  • the thickness of the (meth) acrylic resin film is preferably 10 ⁇ m to 200 ⁇ m, more preferably 20 ⁇ m to 100 ⁇ m. There exists a possibility that intensity
  • the surface tension of the (meth) acrylic resin film is preferably 40 mN / m or more, more preferably 50 mN / m or more, and further preferably 55 mN / m or more.
  • the surface wetting tension is at least 40 mN / m or more, the adhesion between the (meth) acrylic 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.
  • the penetration layer is formed by the penetration of the composition for forming a hard coat layer into the (meth) acrylic resin film as described above.
  • the osmotic layer can correspond to a part of the compatibilized region between the (meth) acrylic resin forming the (meth) acrylic resin film and the component forming the hard coat layer.
  • the concentration of the (meth) acrylic resin forming the (meth) acrylic resin film is preferably continuously increased from the hard coat layer side to the base material layer side. Since the concentration of the (meth) acrylic resin continuously changes, that is, the interface resulting from the concentration change of the (meth) acrylic resin is not formed, interface reflection can be suppressed, and interference unevenness is small. This is because an optical laminate can be obtained.
  • the lower limit of the thickness of the permeation layer is, for example, 1.0 ⁇ m, preferably 1.2 ⁇ m, more preferably 1.5 ⁇ m, and further preferably 2 ⁇ m.
  • the upper limit of the thickness of the permeation layer is preferably ((meth) acrylic resin film thickness ⁇ 70%) ⁇ m, more preferably ((meth) acrylic resin film thickness ⁇ 40%) ⁇ m,
  • the thickness is preferably ((meth) acrylic resin film thickness ⁇ 30%) ⁇ m, particularly preferably ((meth) acrylic resin film ⁇ 20%) ⁇ m.
  • permeation layer can be measured by observation with electron microscopes, such as a reflection spectrum of a hard-coat layer, or SEM and 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.
  • the hard coat layer is formed by coating the composition for forming a hard coat layer on the (meth) acrylic 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.
  • 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 includes, as essential components, one or more radically polymerizable unsaturated groups and a curable compound containing an aromatic ring (A) and two or more radically polymerizable unsaturated groups. And a curable compound (B) that does not contain an aromatic ring, and a monofunctional monomer (C) that contains one radical polymerizable unsaturated group but does not contain an aromatic ring.
  • the radical polymerizable unsaturated group include a (meth) acryloyl group and a (meth) acryloyloxy group.
  • the (meth) acrylic resin film and the hard are used even when the heating temperature (described later) of the coating layer at the time of forming the hard coat layer is set low.
  • An optical laminate having excellent adhesion to the coating layer and hardness can be obtained.
  • the curable compound (A) contains at least one radically polymerizable unsaturated group and one aromatic ring.
  • the curable compound (A) can improve the cohesive strength of the compatibilized region between the (meth) acrylic resin and the hard coat layer forming component, and as a result, improves the adhesion between the base material layer and the hard coat layer. Can be. Further, since the curable compound (A) can increase the refractive index of the hard coat layer, an antireflection film having a lower reflectance is obtained when a low refractive index antireflection layer is laminated on the hard coat layer. be able to.
  • the number of radically polymerizable unsaturated groups contained in the curable compound (A) is preferably 1 to 4. Further, the number of aromatic rings contained in the curable compound (A) is preferably 1 to 6. As an aromatic ring, a benzene ring, a heterocyclic ring, or these condensed rings can be illustrated. Preferably, the aromatic ring is a benzene ring. The aromatic ring may or may not have a substituent.
  • curable compound (A) examples include ethoxylated o-phenylphenol (meth) acrylate, phenoxypolyethylene glycol (meth) acrylate, benzyl (meth) acrylate, 2-hydroxy-3-phenoxy (meth) acrylate, phenoxy Examples include monomers such as ethyl (meth) acrylate, aryl groups such as benzyl group and phenyl group, and (meth) acrylate oligomers or prepolymers containing a fluorene structure.
  • a curable compound (A) may be used independently and may be used in combination of multiple.
  • the molecular weight (weight average molecular weight in the case of an oligomer or polymer) of the curable compound (A) is preferably 250 or more, more preferably more than 450, and still more preferably 450 to 10,000. If the molecular weight is within the above range, the cohesive force of the compatibilized region can be sufficiently improved, so that an optical laminate having excellent adhesion between the base material layer and the hard coat layer can be obtained.
  • the content ratio of the curable compound (A) to the total curable compound in the hard coat layer forming composition is 10% by weight to 60% by weight, preferably 15% by weight to 55% by weight, and more preferably 20% by weight to 50% by weight. If it is such a range, the heating temperature at the time of hard coat layer formation can be set low, the heating time can be set short, and the deformation (for example, shrinkage of the (meth) acrylic resin film) due to heating is suppressed. A laminated body can be produced efficiently.
  • the curable compound (B) contains two or more radically polymerizable unsaturated groups, but does not contain an aromatic ring.
  • the composition for forming a hard coat layer contains a polyfunctional curable compound (B) containing two or more radically polymerizable unsaturated groups, a hard coat layer having sufficient hardness can be formed.
  • the composition for forming a hard coat layer includes a curable compound (B1) containing 9 or more radically polymerizable unsaturated groups as the curable compound (B).
  • a hard coat layer-forming composition containing the curable compound (B1) is applied to form a hard coat layer, the components (representative) in the (meth) acrylic resin film eluted into the hard coat layer-forming composition Specifically, the resin component in the (meth) acrylic resin film) is prevented from diffusing to the air interface of the hard coat layer when the hard coat layer is formed, and an optical laminate having excellent hardness can be obtained.
  • a block layer made of the curable compound (B1) is formed on the hard coat layer.
  • the number of radically polymerizable unsaturated groups contained in the curable compound (B1) is preferably 10 or more, more preferably 15 or more, and further preferably 20 to 100. The greater the number of radical polymerizable unsaturated groups contained in the curable compound (B1), the more the hardness of the hard coat layer itself can be improved.
  • curable compound (B1) examples include oligomers such as urethane (meth) acrylate, polyester (meth) acrylate, epoxy (meth) acrylate, melamine (meth) acrylate, triazine (meth) acrylate, and silicone (meth) acrylate.
  • oligomers such as urethane (meth) acrylate, polyester (meth) acrylate, epoxy (meth) acrylate, melamine (meth) acrylate, triazine (meth) acrylate, and silicone (meth) acrylate.
  • Prepolymers Methacrylate polymers having unsaturated groups and the like. Among these, urethane (meth) acrylate oligomers or prepolymers are preferable from the viewpoint of reactivity and transparency.
  • a curable compound (B1) may be used independently and may be used in combination of multiple.
  • 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.
  • 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.
  • polyol examples 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, pentaeryth
  • 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 weight average molecular weight of the curable compound (B1) is preferably 1000 or more, more preferably 1500 or more, and further preferably 2000 to 50000. Since the curable compound (B1) has 9 or more radically polymerizable unsaturated groups, even if the curable compound (B1) has a relatively small weight average molecular weight, the (meth) acrylic resin film Can be prevented from diffusing to the air interface of the hard coat layer, and an optical laminate having excellent hardness can be obtained. Of course, a curable compound (B1) having a higher weight average molecular weight may be used for the purpose of obtaining an optical layered body having higher hardness.
  • the composition for forming a hard coat layer may contain a curable compound (B2) having 2 to 8 radical polymerizable unsaturated groups as the curable compound (B).
  • the composition for forming a hard coat layer may contain only the curable compound (B2) as the curable compound (B), but a viewpoint of obtaining an optical laminate having more excellent hardness. Is preferable to contain both the curable compound (B1) and the curable compound (B2).
  • the number of radically polymerizable unsaturated groups contained in the curable compound (B2) can be, for example, 2 to 6. If the composition for forming a hard coat layer contains a curable compound (B2) containing 2 to 6 radically polymerizable unsaturated groups, the heating temperature of the coating layer during the formation of the hard coat layer is set low. However, the optical laminated body which is excellent in the adhesiveness of a (meth) acrylic-type resin film and a hard-coat layer can be obtained.
  • curable compound (B2) examples include polyethylene glycol di (meth) acrylate, tricyclodecane dimethanol diacrylate, 1,10-decanediol diacrylate, 1,6-hexanediol diacrylate, and 1,9-nonane.
  • the curable compound (B2) preferably has a hydroxyl group. If the composition for forming a hard coat layer contains such a curable compound (B2), 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 achieved. It is possible to efficiently produce an optical laminate in which the above is suppressed. Moreover, the optical laminated body excellent in the adhesiveness of a (meth) acrylic-type resin film and a hard-coat layer can be obtained.
  • the curable compound (B2) having a hydroxyl group include pentaerythritol tri (meth) acrylate and dipentaerythritol penta (meth) acrylate.
  • the weight average molecular weight of the curable compound (B2) is preferably 3000 or less, more preferably 2000 or less, further preferably 1500 or less, particularly preferably 1000 or less, and particularly preferably 500 or less. .
  • the thickness of the permeation layer can be increased.
  • an optical laminate having excellent adhesion between the (meth) acrylic resin film and the hard coat layer and having suppressed interference unevenness can be obtained.
  • the content ratio of the curable compound (B) to the total curable compound in the hard coat layer forming composition is 30% by weight to 80% by weight, preferably 30% by weight to 75% by weight, and more preferably It is 35 to 70% by weight, particularly preferably 40 to 60% by weight. If it is such a range, the optical laminated body which has sufficient hardness can be obtained.
  • the blending weight ratio (B1 / B2) is, for example, 30/70 to 99/1, preferably May be 40/60 to 99/1, more preferably 50/50 to 99/1.
  • the monofunctional monomer (C) contains one radical polymerizable unsaturated group, but does not contain an aromatic ring. Since the monofunctional monomer (C) easily penetrates into the (meth) acrylic resin film, the penetration layer can be suitably formed. Moreover, if the composition for forming the hard coat layer contains the monofunctional monomer (C), the heating temperature at the time of forming the hard coat layer can be set low, the heating time can be set short, and deformation due to heating is suppressed. An optical laminate can be produced efficiently.
  • the weight average molecular weight of the monofunctional monomer (C) is preferably 500 or less, more preferably 300 or less, still more preferably less than 250, and particularly preferably less than 200. With such a monofunctional monomer, it easily penetrates and diffuses into the (meth) acrylic resin film.
  • monofunctional monomers include methoxypolyethylene glycol (meth) acrylate, 2-ethylhexyl acrylate, lauryl acrylate, isooctyl acrylate, isostearyl acrylate, cyclohexyl acrylate, isoholonyl acrylate, acryloylmorpholine, 2-hydroxyethyl.
  • the monofunctional monomer (C) preferably has a polar group such as a hydroxyl group, ether, amine (including a morpholine ring), and more preferably has a hydroxyl group. If it is such a monofunctional monomer, it is excellent in the permeability or solubility with respect to a (meth) acrylic-type resin film. As a result, 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 layered body in which deformation due to heating is suppressed can be efficiently produced.
  • the said composition for hard-coat layer formation contains the monofunctional monomer which has a hydroxyl group, the optical laminated body excellent in the adhesiveness of a (meth) acrylic-type resin film and a hard-coat layer can be obtained.
  • monofunctional monomers include hydroxyalkyl such as 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and 1,4-cyclohexanemethanol monoacrylate.
  • N- (2-hydroxyalkyl) (meth) acrylamide such as N- (2-hydroxyethyl) (meth) acrylamide and N-methylol (meth) acrylamide, cyclohexanedimethanol monoacrylate and the like.
  • 4-hydroxybutyl acrylate and N- (2-hydroxyethyl) acrylamide are preferable.
  • the boiling point of the monofunctional monomer (C) 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. If it is such a range, it can prevent that a monofunctional monomer volatilizes by the heating at the time of hard-coat layer formation, and a monofunctional monomer can fully osmose
  • the content ratio of the monofunctional monomer (C) to the total curable compound in the hard coat layer forming composition is preferably 10% by weight to 40% by weight, more preferably 12% by weight to 35% by weight, and still more preferably. Is from 15% to 30% by weight. If the content ratio of the monofunctional monomer (C) is within such a range, 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.
  • the total content of the curable compound (A) and the monofunctional monomer (C) with respect to the total curable compound in the hard coat layer forming composition is preferably 20% by weight to 70% by weight, more preferably 30% by weight. % To 65% by weight, more preferably 40% to 60% by weight
  • the hard coat layer forming composition preferably contains any appropriate photopolymerization initiator.
  • 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.
  • 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.
  • organic fine particles examples 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 ⁇ m to 30 ⁇ m, more preferably 2 ⁇ m to 20 ⁇ m.
  • the weight average particle diameter of the fine particles can be measured by, for example, a Coulter count method.
  • 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.
  • 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 leveling agent examples include a fluorine-based or silicone-based leveling agent, and a silicone-based leveling agent is preferable.
  • the silicone leveling agent examples include reactive silicone, polydimethylsiloxane, polyether-modified polydimethylsiloxane, and polymethylalkylsiloxane. Of these, reactive silicone is preferable. If reactive silicone is added, the surface of the hard coat layer is provided with slipperiness and the scratch resistance is maintained for a long period of time.
  • the content of the leveling agent is preferably 5% by weight or less, more preferably 0.01% by weight to 5% by weight with respect to the total amount of monomers, oligomers and prepolymers in the hard coat layer forming composition. %.
  • the hard coat layer forming composition may or may not contain a solvent.
  • 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).
  • a hard coat layer-forming composition containing no solvent, or a hard coat layer-forming composition containing only a poor solvent for the (meth) acrylic resin film-forming material as a solvent can be used.
  • the forming composition can permeate the (meth) acrylic resin film to form a permeation layer having a desired thickness.
  • the thickness of the hard coat layer is preferably 1 ⁇ m or more, more preferably 3 ⁇ m or more, and further preferably 4 ⁇ m to 10 ⁇ m. If it is such a range, the optical laminated body excellent in hardness can be obtained. Moreover, since the optical laminated body of this invention suppresses the spreading
  • the (meth) acrylic resin forming the (meth) acrylic resin film is eluted in the hard coat layer forming composition, and the (meth) acrylic resin is present in the hard coat layer. May be.
  • the hard coat layer is formed by the hard coat layer forming composition containing the polyfunctional curable compound (B)
  • the (meth) acrylic resin moves to the surface side of the hard coat layer. It can be suppressed.
  • concentration of the said (meth) acrylic-type resin becomes low continuously from the base material layer side of a osmosis
  • the interface reflection is suppressed by the fact that the concentration of the (meth) acrylic resin continuously changes, that is, the interface resulting from the concentration change of the (meth) acrylic resin is not formed. And an optical laminated body with less interference unevenness can be obtained.
  • the (meth) acrylic resin and the composition for forming a hard coat layer are phase-separated, and a block layer is formed on the opposite side of the hard coat layer from the osmotic layer.
  • concentration of the said (meth) acrylic-type resin becomes low continuously from the base material layer side of a osmosis
  • the thickness of the block layer is preferably 1 ⁇ m to 10 ⁇ m, more preferably 2 ⁇ m to 5 ⁇ m.
  • the thickness of a block layer can be measured by observation with electron microscopes, such as a reflection spectrum of a hard-coat layer, or SEM and TEM.
  • any appropriate other layer may be disposed outside the hard coat layer as necessary.
  • Typical examples include an antireflection layer and an antiglare layer.
  • an antireflection layer and an antiglare layer usually used in the art can be adopted.
  • the method for producing an optical laminate of the present invention comprises applying a composition for forming a hard coat layer on a (meth) acrylic resin film to form a coating layer, and heating the coating layer. including.
  • the hard coat layer is formed by curing the coating layer after heating.
  • Arbitrary appropriate methods can be employ
  • 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 coating layer can 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 (meth) acrylic resin film. Is done. When heated at a temperature not higher than the glass transition temperature of the resin contained in the (meth) acrylic resin film, an optical layered body in which deformation due to heating is suppressed can be obtained.
  • the heating temperature of the coating layer is, for example, 50 ° C. or higher and lower than 100 ° C., preferably 50 ° C. or higher and lower than 80 ° C., more preferably 50 ° C. to 75 ° C.
  • the monomer, oligomer and / or prepolymer (particularly, the monofunctional monomer (C)) in the composition for forming the hard coat layer is excellent in the (meth) acrylic resin film. Penetration and diffusion.
  • the permeation layer described in the above section C is formed by the hard coat layer forming composition and the (meth) acrylic resin film forming material that has permeated through the heating and the subsequent curing treatment.
  • an optical laminate having excellent adhesion between the (meth) acrylic resin film and the hard coat layer and having suppressed interference unevenness can be obtained.
  • coated composition for hard-coat layer formation can be dried by the said heating.
  • the heating temperature may be set according to the content ratio of the curable compound (A) and the monofunctional monomer (C). For example, if the total content of the curable compound (A) and the monofunctional monomer (C) with respect to the total curable compound in the hard coat layer forming composition is 20% by weight to 70% by weight, the temperature is less than 80 ° C. With this heating temperature, it is possible to obtain an optical layered body that is excellent in adhesion and hardness and that is free from interference unevenness and deformation due to heating, and can be an efficient manufacturing process with low environmental load.
  • the curing process is performed by ultraviolet irradiation.
  • the integrated light quantity of ultraviolet irradiation is preferably 200 mJ to 400 mJ.
  • Pencil hardness About the hard coat layer side surface of the optical laminated body obtained by the Example and the comparative example, according to JISK5400 (load 500g), pencil hardness was measured and evaluated on the following references
  • Adhesion of hard coat layer The adhesion of the hard coat layer to the base film is determined by the cross-cut peel test of JIS K-5400 (substrate (Number of eyes: 100) and evaluated according to the following criteria.
  • ⁇ The number of peels is 0 ⁇ : The number of peels is 1 or more (3) Interference unevenness On the base film side of the optical laminate obtained in Examples and Comparative Examples, a black acrylic plate (manufactured by Mitsubishi Rayon Co., Ltd., After attaching 2 mm thick) via an acrylic pressure-sensitive adhesive, interference unevenness was visually observed under a three-wavelength fluorescent lamp and evaluated according to the following criteria. ⁇ : No occurrence of interference unevenness ⁇ : Generation of interference unevenness is observed (4) Thickness of penetration layer A black acrylic plate (manufactured by Mitsubishi Rayon Co., Ltd.) is formed on the base layer side of the optical laminate obtained in Examples and Comparative Examples.
  • 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.
  • the refractive index was measured using an Abbe refractometer (trade name: DR-M2 / 1550) manufactured by Atago Co., Ltd., selecting monobromonaphthalene as an intermediate solution.
  • 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 ⁇ m Film thickness resolution: 24nm Moreover, the thickness of the hard coat layer was evaluated by measuring the reflection spectrum of the laminate (R) below. Laminate (R): Implemented 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 in the same manner as in Example 1.
  • the thickness of only the hard coat layer is measured from the peak position of the FFT spectrum obtained from the laminate (R).
  • the As a result of the evaluation, the thickness of the hard coat layer was 5.3 ⁇ m.
  • 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.
  • the film is stretched in an atmosphere of 150 ° C. in the transport direction (thickness 80 ⁇ m), 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.
  • 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%.
  • the obtained composition for forming a hard coat layer was applied to form a coating layer, and the coating layer was heated at 75 ° C. for 1 minute.
  • the coated layer after heating was irradiated with ultraviolet light having an accumulated light amount of 300 mJ / cm 2 with a high-pressure mercury lamp to cure the coated layer to form a base layer, a hard coat layer, and a penetrating layer, thereby obtaining an optical laminate. .
  • Example 2 An optical laminate was obtained in the same manner as in Example 1, except that 30 parts of a fluorene-containing acrylate oligomer (product name “EA-HR034” manufactured by Osaka Gas Chemicals Co., Ltd.) was used as the curable compound (A).
  • a fluorene-containing acrylate oligomer product name “EA-HR034” manufactured by Osaka Gas Chemicals Co., Ltd.
  • Example 3 An optical laminate was obtained in the same manner as in Example 1 except that 30 parts of a fluorene-containing acrylate oligomer (product name “HIC-GL”, manufactured by Kyoeisha Chemical Co., Ltd.) was used as the curable compound (A).
  • a fluorene-containing acrylate oligomer product name “HIC-GL”, manufactured by Kyoeisha Chemical Co., Ltd.
  • Example 4 Except that 30 parts of ethoxylated o-phenylphenol (meth) acrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., product name “A-LEN-10”) was used as the curable compound (A), the same procedure as in Example 1 was performed. An optical laminate was obtained.
  • Example 5 The amount of phenol novolac acrylate (manufactured by Hitachi Chemical Co., Ltd., product name “Hitaroid UV251”) was 50 parts, and the amount of curable compound (B) (manufactured by Shin-Nakamura Chemical Co., Ltd., product name “UA53H”) An optical laminate was obtained in the same manner as in Example 1 except that the amount was 50 parts and the heating temperature was 65 ° C.
  • Example 6 50 parts of an oligomer of fluorene-containing acrylate (product name “EA-HR034” manufactured by Osaka Gas Chemicals Co., Ltd.) was used as the curable compound (A), and curable compound (B) (product name “Shin-Nakamura Chemical Co., Ltd., product name“ An optical laminate was obtained in the same manner as in Example 1 except that the amount of UA53H ”) was 50 parts and the heating temperature was 65 ° C.
  • EA-HR034 manufactured by Osaka Gas Chemicals Co., Ltd.
  • Example 7 An optical laminate was obtained in the same manner as in Example 1 except that 30 parts of acryloylmorpholine (manufactured by Kojin Co., Ltd., product name “ACMO”) was used as the monofunctional monomer (C).
  • ACMO acryloylmorpholine
  • Example 8> An optical laminate was obtained in the same manner as in Example 1 except that 30 parts of cyclohexanedimethanol monoacrylate (manufactured by Nippon Kasei Co., Ltd., product name “CHDMMA”) was used as the monofunctional monomer (C).
  • CHDMMA cyclohexanedimethanol monoacrylate
  • Example 1 except that the curable compound (A) was not added and that the amount of the curable compound (B) (product name “UA53H” manufactured by Shin-Nakamura Chemical Co., Ltd.) was 100 parts. Similarly, an optical laminate was obtained.
  • ⁇ Comparative example 4> The amount of phenol novolac acrylate (manufactured by Hitachi Chemical Co., Ltd., product name “Hitaroid UV251”) was 50 parts, and the amount of curable compound (B) (manufactured by Shin-Nakamura Chemical Co., Ltd., product name “UA53H”) An optical laminate was obtained in the same manner as in Example 1 except that the amount was 100 parts and the monofunctional monomer (C) was not added.
  • the permeation layer is suitably formed at a heating temperature of less than 80 ° C., and no interference unevenness is observed. Furthermore, it is excellent in the adhesion between the hard coat layer and the base material layer, and also in the hardness.
  • the optical laminates of Comparative Examples 1 and 2 obtained using the composition for forming a hard coat layer not containing the aromatic ring-containing curable compound (A) a permeation layer was formed, and interference unevenness was observed. Although not possible, the adhesion is insufficient.
  • 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.

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