JP6551117B2 - Optical laminate and method for producing the same - Google Patents

Description

  The present invention relates to an optical laminate and a method of manufacturing the same.

  The support substrate of the optical laminate disposed on the front surface of an image display device such as a liquid crystal display, an organic electroluminescence display, an LED display or a field emission display includes polyethylene terephthalate (PET), triacetyl cellulose (TAC), polyolefin A transparent thermoplastic resin film made of acrylic, polycarbonate (PC) or the like is used.

  In the said optical laminated body, when using the said thermoplastic resin film as a base material, the functional layer according to a use is laminated | stacked. For example, as a functional layer used for a liquid crystal display, a hard coat layer for preventing scratching of the surface, an antiglare layer for preventing reflection of external light, an antireflection layer for preventing surface reflection, etc. may be mentioned. Among the above-mentioned substrates, polyester films such as PET, in particular, are excellent in transparency, dimensional stability, chemical resistance, and can be obtained relatively inexpensively, and are widely used as substrates of various optical laminates. Usually, it is produced by stretching (crystallization by orienting molecules) in order to impart strength and heat resistance.

Since the surface of the stretched polyester film is highly crystallographically oriented, the surface of the stretched polyester film has generally been poorly adhered to various types of paints, adhesives, inks and the like by various methods. Easy adhesion was imparted.
For example, in Patent Documents 1 to 4, easy adhesion to a substrate is achieved by forming a coating layer mainly composed of various resins such as polyester, acrylic, polyurethane, and acrylic graft polyester on the surface of the polyester film of the substrate. A method of imparting sex is disclosed.
Patent Document 5 discloses a coating layer mainly composed of a urethane resin and a blocked isocyanate, having a dissociation temperature of the blocked isocyanate of 130 ° C. or lower and a boiling point of the blocking agent of 180 ° C. or higher from the viewpoint of improving adhesion. The methods to be used, Patent Documents 6 and 7, disclose methods of using an easily adhesive polyester film obtained by adding a resin and an isocyanate crosslinking agent to a coating solution.
Furthermore, in recent years, compared to the above-mentioned stretched polyester film, a polyester film having a retardation of 7000 nm or more, which has different strength and heat resistance and low stretchability, and has different longitudinal and lateral stretch ratios for the purpose of suppressing unevenness in color and brightness. It has been developed.

JP, 2000-141574, A Japanese Patent No. 3900191 JP 2007-253512 A JP, 2009-220376, A JP, 2012-162691, A Japanese Patent No. 4130964 JP, 2009-178955, A

  However, when the present inventors examined whether it is possible to use a polyester film having the above-mentioned retardation of 7000 nm or more (the above-mentioned easy adhesion is given) as a base material of the above-mentioned optical laminate, Although it has initial adhesion at the interface with the optical functional layer formed from the ionizing radiation curable resin composition, it has better adhesion in the wet heat resistance test or FOM test (weather resistance test) than the conventional biaxially stretched polyester film. I found a new problem that the strength decreased. This decrease in adhesion strength is due to differences in production process conditions related to stretching when producing a polyester film having a retardation of 7000 nm or more, that is, differences in thermal history (such as low heating temperature) and stretch ratio. It is presumed that the adhesive strength is reduced as a result of the change in the correlation with the polyester film having a different crystal state or the modification of the primer layer applied before stretching.

  In view of the above problems, it is an object of the present invention to provide an optical laminate having an optical functional layer having high adhesion strength to a polyester film having an adhesion property of 7000 nm or more and a method for producing the same. To do.

In order to solve the above problems, the present invention provides the following optical laminates [1] to [7] and a method for producing the same.
[1] An optical laminate having an optical functional layer on an easily adhesive polyester film having a retardation of 7000 nm or more, wherein the optical functional layer is an ionizing radiation curable resin, oligo (2-hydroxy-2-methyl-1) An optical laminate formed from an ionizing radiation curable resin composition containing-(4-methylvinyl) phenyl) propanone and an ultraviolet absorber.
[2] The optical laminate according to the above [1], wherein the content of the ultraviolet absorber is 1.25 to 3.75 parts by mass with respect to 100 parts by mass of the ionizing radiation curable resin.
[3] The content of the oligo (2-hydroxy-2-methyl-1- (4-methylvinyl) phenyl) propanone is 8 to 25 parts by mass with respect to 100 parts by mass of the ionizing radiation curable resin. The optical layered body according to the above [1].
[4] The above-mentioned [1] to [3], wherein a stretch ratio in the longitudinal direction (MD) of the polyester film is 2.0 times or less and a stretch ratio in the transverse direction (TD) is 2.5 to 6.0 times. The optical laminate according to any one of the above.
In the above description, the draw ratio is MD <TD. However, the MD value range and the TD value range may be interchanged as they are, and a relationship MD> TD may be employed. Hereinafter, the case of MD <TD will be described.
[5] The optical layered body according to any one of [1] to [4], wherein the optical functional layer is an antiglare layer.
[6] An image display device having an optical laminate on the surface, comprising the optical laminate according to any one of the above [1] to [5] as the optical laminate. .
[7] An ionizing radiation curable resin, oligo (2-hydroxy-2-methyl-1- (4-methylvinyl) phenyl) propanone, and an ultraviolet absorber are included on an easily adhesive polyester film having a retardation of 7000 nm or more. The manufacturing method of an optical laminated body including the process of forming an optical functional layer by apply | coating, drying, and hardening | curing an ionizing radiation curable resin composition.

  ADVANTAGE OF THE INVENTION According to this invention, the optical laminated body which has an optical function layer which has high adhesive strength with respect to the polyester film whose retardation which has easy adhesiveness has 7000 nm or more can be provided, and a manufacturing method.

It is sectional drawing which shows an example of the optical laminated body of this invention.

[Optical laminate]
The optical laminate of the present invention is an optical laminate having an optical functional layer on an easily adhesive polyester film having a retardation of 7000 nm or more, and the optical functional layer comprises an ionizing radiation curable resin, oligo (2-hydroxy-). It is an optical laminate formed from an ionizing radiation curable resin composition containing 2-methyl-1- (4-methylvinyl) phenyl) propanone and an ultraviolet absorber.
The retardation in the present invention refers to the refractive index (n _x ) in the direction having the largest refractive index in the plane of the polyester film (slow axis direction) and the direction orthogonal to the slow axis direction (fast axis direction). It is represented by the following formula | equation by refractive index ( _ny ) and the thickness (d) of a polyester film.
Retardation _{(Re) = (n x -n} y) × d
The retardation can be measured, for example, by KOBRA-WR manufactured by Oji Scientific Instruments (measurement angle 0 °, measurement wavelength 548.2 nm).
In addition, a refractive index measures the average reflectance (R) of wavelength 380-780 nm using a spectrophotometer (UV-3100PC by Shimadzu Corp.), and it is the following from the obtained average reflectance (R) The value of the refractive index (n) was obtained using the following formula.
The average reflectance (R) of the optical functional layer is a surface (back surface) on which 50 μm PET without easy adhesion treatment is coated with each raw material composition to form a cured film having a thickness of 1 to 3 μm, and PET is not applied. In order to prevent back surface reflection, a black vinyl tape (for example, NO 200-38-21 38 mm width manufactured by Yamato Co., Ltd.) having a width larger than the measurement spot area was attached, and then the average reflectance of each cured film was measured. The refractive index of the polyester substrate was measured after a black vinyl tape was similarly applied to the surface opposite to the measurement surface.
R (%) = (1-n) ² / (1 + n) ²

  FIG. 1 is a cross-sectional view showing an example of the optical layered body of the present invention. The optical laminate 1 has an optical functional layer (antiglare layer) 5 (including a light transmitting particle 6 imparting an uneven shape on the surface) laminated on an easily adhesive polyester 4 in which a primer layer 3 is laminated on a polyester film 2 It has been done.

  The optical laminate of the present invention can be obtained, for example, by using oligo (2-hydroxy-2-methyl-1- (4-) as a photopolymerization initiator on easily-adhesive polyester film 4 (retardation: 7000 nm or more) in FIG. By forming an optical function layer (antiglare layer) 5 formed by curing an ionizing radiation curable resin composition, each of which contains methylvinyl) phenyl) propanone and an ultraviolet light absorber and contains a light transmitting particle 6 can get.

The mechanism by which the adhesion between the optical functional layer and the polyester film is improved is not clear, but two deductions as described below (including both cases) are made.
First, after applying the ionizing radiation curable resin composition, in the process of solvent drying and UV curing, a part of the photopolymerization initiator in the ionizing radiation curable resin composition is part of the easy adhesion treatment part. It is thought that this is due to the anchor effect derived from the photopolymerization initiator, which diffuses and penetrates and further penetrates to the surface area of the polyester film.
Secondly, in the heat drying of the solvent after application of ionizing radiation curable resin composition at high temperature, the decrease in the amount of photopolymerization initiator due to volatilization and the decrease in irradiation intensity due to adhesion of volatile components to the lamp for ultraviolet irradiation are suppressed. It is considered that the use of a photopolymerization initiator having a high boiling point that leads to the increase in the polymerization initiation point, the curing shrinkage of the ionizing radiation curable resin is suppressed, and the interface strain is reduced.
In addition, in the ionizing radiation curable resin composition, the amount of the photopolymerization initiator is larger than that usually used because of diffusion penetration of the photopolymerization initiator into the easy adhesion treated portion, increase of the polymerization initiation point, etc. Since the photopolymerization initiator is contained, an unreacted photopolymerization initiator remains in the formed optical function layer, and as a result, the weatherability of the optical function layer is lowered, but the ultraviolet light The weather resistance can be maintained by incorporating a specific amount of the absorbent in the optical functional layer.

<Easily adhesive polyester film>
In the optical laminate of the present invention, as a support substrate of the optical laminate, it is further excellent in heat resistance, strength, dimensional stability, chemical resistance, transparency, etc., compared to a normal biaxially stretched polyester film. A highly adhesive polyester film having a retardation of 7000 nm or more is used. Such a supporting substrate may be a laminate of two or more.
In the present invention, the “easily adhesive polyester film” means a polyester film provided with a solvent-soluble primer layer such as a resin thin film.

  Examples of the polyester resin constituting the polyester film used in the present invention include polyethylene terephthalate (hereinafter sometimes referred to as PET), polybutylene terephthalate, polyethylene naphthalate, and polymethylene terephthalate. Among these polyester resins, polyethylene terephthalate and polyethylene naphthalate are preferred from the viewpoint of strength, dimensional stability, chemical resistance, transparency, price and the like, and polyethylene terephthalate is more preferred.

  The method for producing a polyester film having a retardation of 7000 nm or more is not particularly limited as long as the retardation of the polyester film is 7000 nm or more, but can be usually produced by a known method such as a melt extrusion method. Further, the stretching method may be a uniaxial stretching method or a biaxial stretching method. However, when only the uniaxial stretching is performed, the mechanical strength in the direction perpendicular to the stretching direction may be extremely reduced. From the viewpoint of maintaining mechanical strength, it is preferable to use a polyester film produced by biaxial stretching. As a stretching method, taking a PET film as an example of a polyester film, an unstretched PET film is usually stretched in the longitudinal direction (MD; longitudinal direction; machine running direction during film production), and then in the transverse direction ( TD; transverse direction; perpendicular to the running direction) More specifically, for example, an unstretched PET film is stretched in the longitudinal direction with a roll heated to 80 to 120 ° C. to obtain a uniaxially stretched PET film. Furthermore, the end of the film is gripped with a clip, led to a hot air zone in a tenter heated to 70 to 140 ° C., stretched in the transverse direction, and led to a heat treatment zone in the tenter for the purpose of relaxing thermal shrinkage. After the heat setting process, cool. The heat setting treatment temperature is 180 to 250 ° C, preferably 200 to 245 ° C. In addition, the order which concerns on extending | stretching of a longitudinal direction and a transverse direction is not restrict | limited in particular.

  The thickness of the polyester film used for this invention is 15-200 micrometers, Preferably it is 15-150 micrometers, More preferably, it is 15-120 micrometers, More preferably, it is 15-100 micrometers. When the thickness of the film is in the above range, the strength as a support can be ensured, and handling during production will not be hindered. Further, the material cost is suppressed, and when used as a product, it can contribute to thinning and weight reduction of a device used for an image display device or the like.

The stretch ratio in the longitudinal direction (MD) of the polyester film used in the present invention is preferably 2.0 in terms of heat resistance, mechanical strength, dimensional stability, chemical resistance, transparency and the like within the above-mentioned thickness range. Or less, more preferably 1.5 or less. Similarly, the stretching ratio in the transverse direction (TD) of the polyester film is preferably 2.5 to 6.0 times, more preferably 3 in the range of the thickness described above, particularly from the viewpoint of maintaining mechanical strength. 0.0 to 5.5 times. If the stretching ratio in the longitudinal direction (MD) and the transverse direction (TD) of the polyester film is in the above range, it is ensured that the retardation is 7000 nm or more, and the transverse direction (TD) compared to a normal biaxially stretched film. In such a case, a polyester film is obtained which has more excellent mechanical strength, heat resistance (glass transition temperature) and dimensional stability, and in the machine direction (MD), the mechanical strength is maintained.
Here, each draw ratio of MD and TD direction was computed from the following formula | equation.
(Stretch ratio (stretching direction)) = [Length after stretching of original sheet (stretching direction) / (Length of original sheet (unstretched; stretching direction)]]
The polyester film used in the present invention not only has a large draw ratio as described above, but also has a large difference in the ratio between the draw ratio in the longitudinal direction (MD) and the draw ratio in the transverse direction (TD). A type of film (a film having a large retardation described later) is also included.

  The retardation of the superrefractive type polyester film is preferably 7000 to 30000 nm, more preferably 7000 to 20000 nm, and further preferably 8000 to 10,000 nm. It is preferable that the retardation is in the above-mentioned range because rainbow unevenness of the display is reduced. The polyester film used in the present invention has a large retardation despite the thin thickness, and satisfies the above. Note that the rainbow unevenness means unevenness of different colors generated on the display screen when an optical layered body is disposed on the front surface of the liquid crystal display element and observed through a polarizing plate.

A solvent-soluble primer layer is provided on one or both sides of the polyester film used in the present invention in order to impart easy adhesion.
Examples of the resin used for the primer layer include copolyester resins, polyurethane resins, acrylic resins, styrene-maleic acid graft polyester resins, and acrylic graft polyester resins, and at least one or more of them are used. Is preferred. Among them, the viewpoint that the photopolymerization initiator used in the present invention easily diffuses and penetrates and develops the anchor effect derived from the photopolymerization initiator in the region of the polyester film surface in the process of thermal drying of the solvent and ultraviolet curing of the resin. From polyester resin is preferable

The thickness of the primer layer is preferably 50 to 200 nm, more preferably 80 to 120 nm, from the viewpoint of maintaining the optical properties of the optical laminate and obtaining sufficient adhesion strength.
The primer layer is formed on the polyester film surface by a known printing method, coating method or the like using the resin composition as it is or in the state of being dissolved or dispersed in a solvent. In addition, the primer layer laminated | stacked on a polyester film is normally laminated | stacked on the polyester film before extending | stretching. The primer layer has a thickness after stretching.

<Optical function layer>
The optical functional layer is formed of an ionizing radiation curable resin composition containing an ionizing radiation curable resin, oligo (2-hydroxy-2-methyl-1- (4-methylvinyl) phenyl) propanone and a UV absorber.

(Ionizing radiation curable resin)
As the curable resin used for forming the optical functional layer, a transparent resin is preferable, and an ionizing radiation curable resin which is a resin curable by ultraviolet rays is used.

  Examples of the ionizing radiation curable resin include those having an acrylate type or methacrylate type functional group, for example, a relatively low molecular weight polyester resin, polyether resin, acrylic resin, epoxy resin, urethane resin, alkyd resin, spiroacetal resin, Oligomers or prepolymers such as (meth) arylates of polyfunctional compounds such as polybutadiene resins, polythiol polyene resins and polyhydric alcohols, ethyl (meth) acrylates, ethylhexyl (meth) acrylates, styrene, methylstyrene, N-vinylpyrrolidone, etc. Monofunctional monomers as well as polyfunctional monomers, such as polymethylolpropane tri (meth) acrylate, hexanediol (meth) acrylate, tripropylene glycol di (meth) acrylate, diethylene glycol (Meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate.

(Photopolymerization initiator)
In the present invention, oligo (2-hydroxy-2-methyl-1- (4-methylvinyl) phenyl) propanone (hereinafter sometimes referred to as "the photopolymerization initiator of the present invention") is a photopolymerization initiator. Used as
The photopolymerization initiator of the present invention can be added to an ionizing radiation curable resin composition containing an ionizing radiation curable resin and an ultraviolet absorber, and the ionizing radiation curable resin can be cured under ultraviolet light.
The photopolymerization initiator of the present invention has a large molecular weight, a melting point as high as 100 to 110 ° C., and a decomposition residue compared to low molecular weight photopolymerization initiators such as benzophenones and acetophenones generally used as photopolymerization initiators. Few. Therefore, when a hard coat layer formed of an ionizing radiation curable resin composition is used as an optical functional layer, for example, when a solvent etc. in the ionizing radiation curable resin composition is thermally dried, a high boiling point solvent after application Even when the drying temperature is increased to the boiling point of the solvent during leveling by the solvent, the photopolymerization initiator of the present invention does not volatilize and decrease, and the volatile component adheres to the ultraviolet irradiation lamp, and the irradiation intensity. There will be no decrease in Moreover, by using the photopolymerization initiator of the present invention having a high boiling point, the polymerization initiation point is increased, and the cure shrinkage of the ionizing radiation curable resin is suppressed, which leads to the reduction in interface strain. Furthermore, by increasing the content of the photopolymerization initiator of the present invention to a specific range described later, it diffuses and penetrates into the easy-adhesion treated part, and as a result, the photopolymerization start to the polyester film surface region used in the present invention There is a possibility of leading to the expression of the anchor effect derived from the agent.

(UV absorber)
The ionizing radiation curable resin composition includes an ultraviolet absorber (UVA) from the viewpoint of suppressing the deterioration of ultraviolet rays of the polyester film used in the present invention and improving the weather resistance and wet heat resistance related to the adhesion strength of the optical functional layer. Is used. Although it does not restrict | limit especially as an ultraviolet absorber (UVA), The triazine type ultraviolet absorber mentioned below is used preferably. The triazine-based ultraviolet absorber has a large molecular weight, and the triazine skeleton suppresses bleed out and has a low volatility, so that it can maintain the ultraviolet absorbing ability for a long time. In addition, it is essential that the ultraviolet absorbent used in the present invention does not volatilize at the time of heat drying such as a solvent at the time of forming the optical functional layer.
As the triazine-based ultraviolet absorber, 2- (2-hydroxy-4- [1-octyloxycarbonylethoxy] phenyl) -4,6-bis (4-phenylphenyl) -1 which is a hydroxyphenyl triazine-based ultraviolet absorber. , 3,5-triazine (trade name “TINUVIN479” manufactured by BASF), 2- (4,6-bis (2,4-dimethylphenyl) -1,3,5-triazin-2-yl) -5 Hydroxyphenyl and a reaction product of oxirane {especially [(C10-C16, mainly C12-C13 alkyloxy) methyl] oxirane} (manufactured by BASF, trade name “TINUVIN 400”), 2- (2,4- Dihydroxyphenyl) -4,6-bis- (2,4-dimethylphenyl) -1,3,5-triazine and (2-ethylhexyl) ) -Glycidic acid ester reaction product (trade name “TINUVIN405” manufactured by BASF), 2,4-bis [2-hydroxy-4-butoxyphenyl] -6- (2,4-dibutoxyphenyl) -1 , 3-5 triazine (manufactured by BASF, trade name "TINUVIN 460"), and the like. 2- (2-hydroxy-4- [1-octyloxycarbonylethoxy] phenyl) -4,6-bis (4-phenylphenyl) -1,3 in that sufficient weather resistance can be imparted with a small addition amount. Preferred is 5-triazine (manufactured by BASF, trade name "TINUVIN 479").

(Content of photopolymerization initiator and UV absorber)
The content of the photopolymerization initiator used in the present invention is preferably 5 to 25 parts by mass, more preferably 8 to 25 parts by mass, still more preferably 10 to 21 parts by mass with respect to 100 parts by mass of the ionizing radiation curable resin. Part by mass, more preferably 12 to 18 parts by mass. When the content of the photopolymerization initiator is in the above-mentioned range, diffusion and penetration to the easily adhesion-treated portion becomes sufficient, and the interface strain becomes small, and in particular, the weather resistance is improved from the viewpoint of the adhesion strength.
The content of the ultraviolet absorber (UVA) used in the present invention is preferably 1.25 to 3.75 parts by mass, more preferably 1.5 to 3.5 parts by mass with respect to 100 parts by mass of the ionizing radiation curable resin. It is 3.5 parts by mass, more preferably 1.7 to 3.3 parts by mass, and even more preferably 2.0 to 3.0 parts by mass. When the content of the ultraviolet absorber (UVA) is in the above range, the ultraviolet resistance is sufficient, the resin is sufficiently cured, and the strength is maintained. As described above, when the content of the ultraviolet light absorber is constant, the amount of absorbed ultraviolet light changes according to the thickness of the layer, so the thickness of the optical function layer containing the ultraviolet light absorber is preferably 2 to 20 μm, and more preferably Preferably it is 3-6 micrometers.
When the contents of the ultraviolet absorber (UVA) and the photopolymerization initiator are within the above ranges, the initial adhesion when the easily adhesive polyester film used in the present invention is used as the support substrate of the optical laminate. In addition to strength, adhesion strength is maintained in the wet heat resistance test and FOM test (weather resistance test) without decreasing.

(Other additives)
In the ionizing radiation curable resin composition of the present invention, if necessary, an organic solvent, a photosensitizer, a light stabilizer, a crosslinking agent, a curing agent, a polymerization accelerator, a viscosity modifier, a leveling agent, Additives such as a colorant, a flame retardant, an antiglare agent, an antistatic agent, an antifouling agent, and an antioxidant can be included.

The optical laminate of the present invention is not particularly limited, but various optical functional layers can be provided depending on the application.
As the optical functional layer, a hard coat layer (HC), an antiglare layer (AG), an antireflective layer (AR), a low reflective layer (LR), a low reflective antiglare layer (AG / LR), an antireflective antiglare layer (AG / AR), an antistatic layer, etc. are mentioned. The optical functional layer in contact with the primer layer on the polyester film having a retardation of 7000 nm or more according to the present invention is obtained from an ionizing radiation curable resin composition containing at least an ionizing radiation curable resin, a photopolymerization initiator and a UV absorber. Shall be formed.

<Hard coat layer>
As the optical functional layer of the present invention, a hard coat layer may be provided for the purpose of improving surface characteristics such as scratch resistance. Here, a hard coat means what shows hardness more than "H" in the pencil hardness test prescribed | regulated by JISK5600-5-4: 1999. The thickness of the hard coat layer is preferably in the range of 0.1 to 20 μm, and more preferably in the range of 0.8 to 10 μm. The hard coat layer can be formed from the ionizing radiation curable resin composition.

<Anti-glare layer>
On the polyester film used in the present invention, the optical laminate of the present invention has the function of the hard coat layer, and for the purpose of preventing reflection of external light and visibility due to glare, etc. It is preferable to provide an antiglare layer having an uneven shape. In the present invention, a surface adjustment layer may be formed on the antiglare layer for the purpose of improving the contrast by controlling the roughness. Although the surface adjustment layer is not particularly limited, for example, a resin composition containing the ionizing radiation curable resin material is used.

  The method of forming the antiglare layer is not particularly limited, but generally, a method of forming an antiglare layer having a concavo-convex shape using a resin composition in which fine particles are added to the resin (A), on a supporting substrate B) A method for forming an antiglare layer having a concavo-convex shape using a resin composition not containing fine particles, (C) an anti-embossing plate having an concavo-convex shape obtained by a sandblasting method, a bead shot method, or the like. The method etc. of forming a glare layer are mentioned. Hereinafter, the case where the formation method of said (A) is used as one aspect | mode which concerns on anti-glare layer formation used for this invention is demonstrated.

  The antiglare layer used in the present invention is, for example, an ionizing radiation curable resin composition obtained by adding fine particles (light transmitting particles) to the ionizing radiation curable resin, and is used on the primer layer of the polyester film used in the present invention Form. Examples of the fine particles used in the ionizing radiation curable resin composition include spherical particles such as a true spherical shape and an elliptical shape. The average particle diameter R (μm) of the fine particles is 1.0 to 20 μm, preferably 3.5 to 15 μm.

  The fine particles include those made of inorganic or organic materials, but those made of organic materials are preferred. The fine particles are preferably transparent and include plastic beads. Specific examples of plastic beads include styrene beads (refractive index 1.59), melamine beads (refractive index 1.57), acrylic beads (refractive index 1.49), acrylic-styrene beads (refractive index 1.54), etc. Plastic beads having a hydrophobic group on the bead surface are preferable.

The average particle size of the fine particles (when the particle size is on the order of microns) can be calculated by following the following procedures (1) to (3).
(1) A transmission observation image of the optical sheet of the present invention is taken with an optical microscope. The magnification is preferably 500 to 2000 times.
(2) Arbitrary 10 particles are extracted from the observation image, the long diameter and the short diameter of each particle are measured, and the particle diameter of each particle is calculated from the average of the long diameter and the short diameter. The major axis is the longest diameter on the screen of individual particles. The minor axis is a distance between two points where a line segment perpendicular to the midpoint of the line segment constituting the major axis is drawn and the perpendicular line segment intersects the particle.
(3) The same operation is performed five times on the observation image of another screen of the same sample, and the value obtained from the number average of the particle diameters for a total of 50 particles is taken as the average particle diameter of the particles.

  The antiglare layer comprises the fine particles and the above-described resin by using a suitable solvent, for example, alcohols such as isopropyl alcohol, methanol, and ethanol; ketones such as methyl ethyl ketone (MEK), methyl isobutyl ketone (MIBK), and cyclohexanone; Ionizing radiation curable resin compositions obtained by mixing with esters of methyl, ethyl acetate, butyl acetate and the like; halogenated hydrocarbons; aromatic hydrocarbons such as toluene, xylene and the like; or mixtures thereof It forms by coating to an easily-adhesive polyester film.

  The thickness of the antiglare layer is preferably 0.5 to 20 μm, more preferably 2 to 9 μm, and still more preferably 3 to 6 μm. When the thickness is in the above range, it is possible to suppress a decrease in visibility due to reflection of external light or reflection of an image.

  The refractive index of the antiglare layer is, for example, smaller than the refractive index of the adjacent high refractive index layer when the antireflection layer, which is an optical functional layer described later, has a two-layer configuration of a high refractive index layer / low refractive index layer. It is preferably within the range of .45 to 1.70, more preferably within the range of 1.45 to 1.60. If the refractive index of the antiglare layer is in such a range, there will be no difficulty in controlling the refractive index of the high refractive index layer.

The total haze value (JIS K7136: 2000) of the antiglare layer is preferably 0.3 to 50%, and more preferably 1 to 40%.
If the total haze is within this range, antiglare properties can be imparted, and a decrease in resolution and contrast of the display element can be suppressed.

  Coating methods for the antiglare layer composition include: micro gravure coating method, air knife coating method, curtain coating method, roll coating method, wire bar coating method, slide coating method, extrusion coating method (die coating method), roll Examples of the coating method include a coating method and a Miya bar coating method. After applying the resin composition for the antiglare layer, drying and ultraviolet curing are performed. Ultraviolet light sources include light sources of ultra-high pressure mercury lamps, high pressure mercury lamps, low pressure mercury lamps, carbon arc lamps, black light fluorescent lamps, and metal halide lamps. As the wavelength of the ultraviolet light, a wavelength range of 190 to 380 nm can be used. By curing the resin, the fine particles in the resin are fixed, a predetermined uneven shape is formed on the outermost surface of the antiglare layer, and hard coat properties are imparted.

<Low reflection layer>
As the optical functional layer used in the present invention, a low reflective layer may be further provided on the hard coat layer or the antiglare layer. The refractive index of the low reflective layer is to have a refractive index lower than the refractive index of the antiglare layer, and is preferably composed of a refractive index of less than 1.5, and is composed of 1.45 or less More preferable (hereinafter, the low reflection layer is referred to as a low refractive index layer).

  The low refractive index layer is (i) a resin composition for forming a low refractive index layer containing low refractive index particles such as silica and magnesium fluoride and a binder resin, and (ii) a fluorine-containing polymer which itself has a low refractive index (Iii) A low refractive index resin composition containing the low refractive index particles and a fluorine-containing polymer as a binder resin, (iv) formed by a vapor deposition method such as chemical vapor deposition (CVD) or physical vapor deposition (PVD) Formed of a thin film such as silica or magnesium fluoride.

  In the present invention, a resin composition for forming a low refractive index layer, which preferably contains low refractive index particles and a binder resin, from the viewpoint of easy formation of the low refractive index layer and obtaining excellent antireflection performance and scratch resistance. Formed by things. Although it does not restrict | limit especially as binder resin, The ionizing radiation curable resin mentioned above can be used. Moreover, when using ionizing radiation curable resin as an ultraviolet curable resin, Preferably a photoinitiator is 0.5-10 mass parts with respect to 100 mass parts of ionizing radiation curable resin, More preferably, it is 1. Add ~ 5 parts by weight. The photopolymerization initiator may be appropriately selected from those conventionally used, and is not particularly limited, and examples thereof include acetophenone-based, benzophenone-based, and benzoin-based photopolymerization initiators. A photoinitiator may be used.

  As the low refractive index particles, any of inorganic types such as silica and magnesium fluoride, or organic types can be used without limitation, but the antireflection properties are further improved and good surface hardness is secured. From the viewpoint, particles having a structure having voids themselves are preferably used.

  A particle having a structure having a void itself has a fine void inside, for example, it is filled with a gas such as air having a refractive index of 1.0, so that its own low refractive index It has become. Examples of particles having such voids include inorganic or organic porous particles, hollow particles, etc. For example, porous polymer particles using porous silica, hollow silica particles, acrylic resin, etc. And hollow polymer particles.

  Although content of the hollow silica particle in a low-refractive-index layer is not specifically limited, Preferably, it is 30-200 mass parts with respect to 100 mass parts of resin solid content.

  The average particle diameter of the primary particles of the low refractive index particles is preferably 5 to 200 nm, more preferably 5 to 100 nm, and further preferably 10 to 80 nm. If the average particle diameter of the particles is within the above range, the transparency of the low refractive index layer is not impaired, and a good dispersion state of the particles can be obtained.

The average particle diameter of the primary particles (high refractive index particles such as those described later, the same applies when the particle diameter is in the nano order) can be calculated by following the following procedures (1) to (3).
(1) The cross section of the optical sheet of the present invention is imaged with TEM or STEM. The acceleration voltage of TEM or STEM is preferably 10 kV to 30 kV, and the magnification is preferably 50,000 to 300,000 times.
(2) Arbitrary 10 particles are extracted from the observation image, the long diameter and the short diameter of each particle are measured, and the particle diameter of each particle is calculated from the average of the long diameter and the short diameter. The major axis is the longest diameter on the screen of individual particles. The minor axis is a distance between two points where a line segment perpendicular to the midpoint of the line segment constituting the major axis is drawn and the perpendicular line segment intersects the particle.
(3) The same operation is performed five times on the observation image of another screen of the same sample, and the value obtained from the number average of the particle diameters for a total of 50 particles is taken as the average particle diameter of the particles.

  The low refractive index layer preferably has a refractive index of 1.3 to 1.5 and a thickness of 80 to 180 nm, more preferably a refractive index of 1.4 to 1.45 and a thickness of 100 to 130 nm. When the refractive index and thickness are in the above ranges, excellent antireflection performance can be obtained.

  In the present invention, various additives are added to the outermost surface and various functions, for example, hard coat function having high hardness and abrasion resistance, antifogging coat function, antifouling coat function, UV shielding coat A function, an infrared shielding coat function, etc. can also be provided.

  In order to further improve the low reflectivity, the low refractive index layer and the high refractive index layer described below may have a two-layer structure. Specifically, by disposing the high refractive index layer between the low refractive index layer and the above-described hard coat layer or antiglare layer, the surface of the optical laminate can be further reduced in reflection.

  The high refractive index layer is usually (i) a resin composition for forming a high refractive index layer containing high refractive index particles such as zirconium oxide, diantimony pentoxide, and antimony-doped tin oxide, and a binder resin; (ii) itself It is formed of a polymer having a high refractive index, (iii) a thin film such as zirconium oxide or diantimony pentoxide formed by a vapor deposition method such as chemical vapor deposition (CVD) or physical vapor deposition (PVD). In the present invention, the high refractive index layer is preferably formed of a cured product of a resin composition containing high refractive index particles and a binder resin (ionizing radiation curable resin etc.) from the viewpoint of production cost and scratch resistance. The

  The thicknesses of the primer layer, the antiglare layer, the low refractive index layer, the high refractive index layer, the hard coat layer, etc. described above are, for example, 20 thicknesses from the image of the cross section taken using a scanning transmission electron microscope (STEM) Can be calculated from the average of 20 values. The acceleration voltage of STEM is preferably 10 kv to 30 kV. The STEM magnification is preferably 1000 to 7000 times when the measured thickness is in the micron order, and preferably 50,000 to 300,000 times when the measured thickness is in the nano order. The refractive index of the optical function layer can be calculated, for example, by fitting a reflection spectrum measured by a reflection photometer and a reflection spectrum calculated from an optical model of a multilayer thin film using a Fresnel coefficient.

[Image display device]
According to another aspect of the present invention, an image display device can be provided, and the image display device has the optical laminate according to the present invention formed on the surface of the image display device. The image display device according to the present invention may be a non-self-luminous image display device such as a liquid crystal display, or a self-luminous image display device such as an organic electroluminescence display, an LED display, or a field emission display.
In any case, the image display apparatus of the present invention can be used for image display such as television use and computer monitor use. In particular, it can be preferably used on the surface of a high-definition image display such as a liquid crystal panel or an organic electroluminescence panel.

[Method for producing optical laminate]
The method for producing an optical laminate according to the present invention comprises an ionizing radiation curable resin, oligo (2-hydroxy-2-methyl-1- (4-methylvinyl) phenyl, on an easily adhesive polyester film having a retardation of 7,000 nm or more. ) A step of forming an optical functional layer by applying, drying and curing an ionizing radiation curable resin composition containing propanone and an ultraviolet absorber.
However, although the optical functional layer may be composed of two or more layers, the optical functional layer composed of at least one layer in contact with the primer layer is composed of the ionizing radiation curable resin, oligo (2-hydroxy-2-methyl-1- It is formed from an ionizing radiation curable resin composition containing (4-methylvinyl) phenyl) propanone and a UV absorber.

(Optical function layer forming process)
The optical functional layer used in the optical laminate of the present invention is formed on the primer layer of a polyester film having a retardation of 7000 nm or more.
The optical functional layer of the present invention is produced by passing through an optical functional layer forming step including the steps of coating, drying and curing.
As an optical function layer, a hard-coat layer, a glare-proof layer, a reflection prevention layer, etc. are suitably selected according to a use as mentioned above.
As described above, FIG. 1 is a cross-sectional view showing an example of the optical layered body of the present invention, which is an example in which an antiglare layer is laminated as an optical functional layer. In FIG. 1, an optical function layer (antiglare layer) 4 includes, for example, light transmitting particles 5, the ionizing radiation curable resin, oligo (2-hydroxy-2-methyl-1- (4-methylvinyl) phenyl). It is formed from an ionizing radiation curable resin composition containing propanone and an ultraviolet absorber.
In the step of forming the optical functional layer as described above, the oligo (2-hydroxy-2-methyl-1- (4-methylvinyl) phenyl) propanone is added to the easy-to-adhere portion (solvent-soluble primer layer) Diffusion penetrates.
In order to effectively diffuse and penetrate oligo (2-hydroxy-2-methyl-1- (4-methylvinyl) phenyl) propanone to the adhesion-promoted portion, the specific range of the content of the photopolymerization initiator is described above. It is preferable to increase the thickness or to form an easy-adhesion treated portion (solvent-soluble primer layer) from a polyester resin.

The optical function layer (antiglare layer) 4 is coated on the primer layer 3 using an ionizing radiation curable resin composition.
The optical functional layer coating methods include micro gravure coating method, air knife coating method, curtain coating method, roll coating method, wire bar coating method, slide coating method, extrusion coating method (die coating method), dip coating method, etc. Among these, roll coating and extrusion coating (die coating) are preferred.

After applying the ionizing radiation curable resin composition, drying and curing are performed.
In the present invention, the drying treatment with heat is preferably 40 to 150 ° C., more preferably 40 to 150 ° C., from the viewpoint of suppressing the volatilization of the photopolymerization initiator (inhibiting the decrease in the amount of the initiator) and promoting diffusion and penetration into the easy adhesion treatment portion. Is 50 to 130 ° C, more preferably 60 to 110 ° C.
The drying treatment time varies depending on the boiling point and viscosity of the solvent, but is preferably 10 seconds to 10 minutes, more preferably 15 seconds to 5 minutes, and further preferably 15 seconds to 3 minutes.
Next, the photopolymerization initiator is irradiated with ultraviolet rays to cure the resin. Examples of the ultraviolet light source include ultra-high pressure mercury lamp, high pressure mercury lamp, low pressure mercury lamp, carbon arc lamp, black light fluorescent lamp, and metal halide lamp light source. As the wavelength of the ultraviolet light, a wavelength range of 190 to 380 nm can be used. The optical function layer of the present invention contains a specific amount of an ultraviolet absorber, but since the amount of absorption of ultraviolet rays changes depending on the thickness, the amount of irradiation of ultraviolet rays is sufficient to absorb ultraviolet rays to the photopolymerization initiator of the present invention It is necessary to adjust accordingly. Usually, the thickness of the optical function layer including a UV absorber, if it is 2～9Myuemu, is irradiated to cure the ultraviolet irradiation amount of 40mJ ^/ cm ² ~1000mJ ^/ cm 2 by an ultraviolet lamp. ^Preferably, a ^{200mJ / cm 2 ~1000mJ / cm 2} . At the time of irradiation, the irradiation may be completed by one continuous irradiation, or may be completed by dividing the irradiation.
When the solvent is dried and the ionizing radiation curable resin is cured, an optical functional layer is formed on the primer layer of the polyester film used in the present invention.

  In the case of laminating two or more optical functional layers, coating, drying and curing can be performed in the same process as the first layer after the second layer. However, as a photoinitiator, the photoinitiator of this invention may be used and the other photoinitiator mentioned above may be used.

  EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited at all by this example. “Parts” and “%” are based on mass unless otherwise specified.

Example 1
The following anti-adhesion agent containing a photopolymerization initiator, oligo (2-hydroxy-2-methyl-1- (4-methylvinyl) phenyl) propanone and an ultraviolet light absorber on an easily adhesive PET film A (thickness 100 μm, retardation: 10500 nm) After the resin composition 1 for forming a glare layer is coated with a miyah bar and the coated film after the coating is dried at a temperature of 70 ° C. for 30 seconds, under an nitrogen purge (oxygen concentration 200 ppm or less), the irradiation dose is The antiglare layer was formed by irradiating and curing to 100 mJ / cm ² . The thickness of the antiglare layer was 3 μm.

<Anti-glare layer forming resin composition 1>
Pentaerythritol triacrylate (PETA): 10 parts by mass Dipentaerythritol hexaacrylate (DPHA): 40 parts by mass oligomer EKS-796: 50 parts by mass Photopolymerization initiator Oligo (2-hydroxy-2-methyl-1- (4- Methylvinyl) phenyl) propanone (manufactured by Lamberti): 10 parts by mass translucent first fine particle monodispersed acrylic beads (particle size 2 μm: 1.555): 3 parts by mass translucent second fine particle fumed silica (particle size 30 nm): 1 part by mass Silicon-based leveling agent TSF4460 (manufactured by Momentive Performance Materials): 0.01 part by mass UV absorber: 2.5 parts by mass The above materials and toluene: anone: MIBK: IPA is 50:22 : A solvent of 3:25 was added to prepare a total solid content of 38%.

(Example 2)
Example 1 except that the addition amount of the photopolymerization initiator oligo (2-hydroxy-2-methyl-1- (4-methylvinyl) phenyl) propanone was changed from 10 parts by mass to 15 parts by mass in Example 1. An optical laminate was prepared in the same manner as described above.

(Example 3)
Example 1 except that the addition amount of the photopolymerization initiator oligo (2-hydroxy-2-methyl-1- (4-methylvinyl) phenyl) propanone was changed from 10 parts by mass to 20 parts by mass in Example 1. An optical laminate was prepared in the same manner as described above.

(Example 4)
Example 1 except that the addition amount of the photopolymerization initiator oligo (2-hydroxy-2-methyl-1- (4-methylvinyl) phenyl) propanone was changed from 10 parts by mass to 5 parts by mass in Example 1. An optical laminate was prepared in the same manner as described above.

(Example 5)
In Example 1, the optical laminated body was produced like Example 1 except having changed the addition amount of the ultraviolet absorber into 1.5 mass parts.

(Example 6)
In Example 1, the optical laminated body was produced like Example 1 except having changed the addition amount of the ultraviolet absorber into 3.5 mass parts.

(Example 7)
An optical laminate was produced in the same manner as in Example 1 except that the amount of the ultraviolet absorber added was changed to 1.25 parts by mass.

(Example 8)
An optical laminate was produced in the same manner as in Example 1 except that the amount of the ultraviolet absorber added was changed to 3.75 parts by mass.

(Example 9)
An optical laminate was produced in the same manner as in Example 1 except that the PET film in Example 1 was changed from PET film A to an easily adhesive PET film B (thickness 100 μm, retardation: 10500 nm).

(Example 10)
Example 7 except that the addition amount of the photopolymerization initiator oligo (2-hydroxy-2-methyl-1- (4-methylvinyl) phenyl) propanone is changed from 10 parts by mass to 15 parts by mass in Example 7 An optical laminate was prepared in the same manner as described above.

(Example 11)
The following antiglare layer-forming resin composition comprising a photopolymerization initiator oligo (2-hydroxy-2-methyl-1- (4-methylvinyl) phenyl) propanone on PET film A (thickness: 100 μm, retardation: 10500 nm) After applying 2-1 with a miyabar and drying the coated film after application for 30 seconds at a temperature of 70 ° C., under an nitrogen purge (oxygen concentration of 200 ppm or less), the irradiation dose is 100 mJ / cm ² using ultraviolet light. This was irradiated and cured to form an antiglare layer 2-1. The thickness of the antiglare layer was 2 μm. Furthermore, on the obtained anti-glare layer 2-1, the following anti-glare layer-forming resin composition 2-2 was coated with a Miya bar, and the coated film was dried at a temperature of 70 ° C. for 30 seconds, and then nitrogen was applied. Under a purge (oxygen concentration of 200 ppm or less), UV irradiation was performed at an irradiation dose of 150 mJ / cm ² to cure, thereby forming a surface adjustment layer (antiglare layer 2-2) having a thickness of 3 μm.

<Anti-glare layer forming resin composition 2-1>
Pentaerythritol triacrylate (PETA): 40 parts by mass Acrylic polymer EMS 381: 30 parts by mass Oligomer EKS-796: 30 parts by mass Photopolymerization initiator Oligo (2-hydroxy-2-methyl-1- (4-methylvinyl) phenyl) Propanone (Lamberti): 10 parts by mass translucent first fine particle monodispersed acrylic beads (particle size 5 μm: 1.545): 7 parts by mass translucent second fine particle fumed silica (particle size 30 nm): 1 mass Part: Silicon-based leveling agent TSF 4460 (manufactured by Momentive Performance Materials): 0.005 parts by mass UV absorber: 2.5 parts by mass The above materials and a solvent of toluene: anon: MIBK 70: 10: 20 are added Prepared so that the total solid content is 30%.

<Anti-glare layer forming resin composition 2-2>
Urethane acrylate (UA): 50 parts by mass Epoxy acrylate (EA): 5 parts by mass Acrylic ester (AE): 45 parts by mass Photopolymerization initiator IRGACURE184 (manufactured by BASF): 3 parts by mass PEDOT: 0.5 parts by mass carbon nanotube : 0.01 parts by mass Fluorine-based leveling agent RS-71 (manufactured by DIC): 0.7 parts by mass The above materials and a solvent in which MIBK: ethylene glycol: ethanol: IPA: butanol is 65: 5: 7: 13: 10 To make the total solid content 30%.

(Comparative example 1)
In Example 1, an optical laminate was produced in the same manner as in Example 1 except that no ultraviolet absorber was added.

(Comparative example 2)
An optical laminate was produced in the same manner as in Example 1 except that the photopolymerization initiator was changed to IRGACURE 184 in Example 1.

(Comparative example 3)
An optical laminate was produced in the same manner as in Example 9 except that the photopolymerization initiator was changed to IRGACURE 184 in Example 9.

(Comparative example 4)
In Example 1, except that the PET film was changed to A-4100 (manufactured by Toyobo Co., Ltd., Cosmo Shine; A-4100; thickness 100 μm, retardation: 3200 nm), and the ultraviolet absorber was changed to zero, the same as in Example 1 An optical laminate was produced.

  The following (1) and (2) were evaluated for the optical laminates obtained in Examples 1 to 11 and Comparative Examples 1 to 4. The evaluation results are shown in Tables 1 and 2.

(1) FOM Test and Moisture Heat Resistance Test The optical laminates obtained in Examples and Comparative Examples were subjected to FOM test and moisture heat resistance test under the following conditions. Adhesion was evaluated by a cross cut cross cut test.

The cross cut cross cut test is a test for evaluating the adhesiveness by calculating the ratio of the number of cut parts remaining on the substrate after peeling the tape with respect to the original number of cut parts (100). The adhesion was ranked according to the following criteria.
Evaluation criteria 95/100 to 100/100: ◎
50/100 to 94/100: ○
25 / 100-49 / 100: △
Less than 25/100: ×

The optical laminate was irradiated with ultraviolet light for 50 hours using a FOM test condition weather resistance tester (manufactured by Suga Test Instruments Co., Ltd., product name “ultraviolet fade meter U48, light source: carbon arc lamp). Thereafter, the adhesion between the antiglare layer and the PET film was evaluated by the cross cut grid test, and the samples were ranked based on the same criteria as described above.

Moisture Heat Resistance Test Conditions The optical laminate was left for 500 hours in an environment of 60 ° C. and 90% RH. Next, the optical laminate was taken out and left at room temperature and normal humidity for 12 hours. Thereafter, the adhesion between the antiglare layer and the PET film was evaluated by a cross-cut cross cut test, and ranked according to the same criteria as described above.

(2) Haze, total light transmittance About the optical laminated body obtained by the Example and the comparative example, using a haze meter (HM-150, made by Murakami Color Research Laboratory), haze according to JIS K-7136: 2000 ( The total light transmittance was measured in accordance with JIS K7361-1: 1997.

  From Tables 1 and 2, a specific amount of oligo (2-hydroxy-2-methyl-1- (4-methylvinyl) phenyl) propanone and a specific amount of ultraviolet light as a photopolymerization initiator in the optical functional layer (in the resin composition) It was found that the adhesion between the optical functional layers of Examples 1 to 11 formed using an absorbent and the easy-adhesive PET film having a retardation of 7000 nm or more as a substrate was 7000 nm or more. It was. On the other hand, in Comparative Example 4 in which the PET film was A-4100 having a retardation of 3200 nm and no ultraviolet light absorber, the adhesion after the FOM test and the wet heat test was poor.

  The optical layered body of the present invention can be suitably used for a display surface of an image display device such as a liquid crystal display or an organic electroluminescence display.

1: Optical laminate 2: Polyester film (Retardation: 7000 nm or more)
3: Primer layer 4: Easy-adhesive polyester film 5: Optical functional layer (antiglare layer)
6: Translucent particles

Claims (7)

  An optical laminate having an optical functional layer on an easily adhesive polyester film having a retardation of 7000 nm or more, wherein the optical functional layer is an ionizing radiation curable resin, oligo (2-hydroxy-2-methyl-1- (4) An optical laminate formed from an ionizing radiation curable resin composition containing methylvinyl) phenyl) propanone and an ultraviolet absorber.   The optical laminated body of Claim 1 whose content of the said ultraviolet absorber is 1.25-3.75 mass parts with respect to 100 mass parts of the said ionizing radiation curable resins.   The content of the oligo (2-hydroxy-2-methyl-1- (4-methylvinyl) phenyl) propanone is 8 to 25 parts by mass with respect to 100 parts by mass of the ionizing radiation curable resin. The optical laminated body as described in.   4. The polyester film according to any one of claims 1 to 3, wherein the stretching ratio in the longitudinal direction (MD) is 2.0 times or less and the stretching ratio in the transverse direction (TD) is 2.5 to 6.0. The optical laminated body as described.   The optical laminated body of any one of Claims 1-4 whose said optical function layer is an anti-glare layer.   An image display device having an optical layered body on the surface, wherein the optical layered body uses the optical layered body according to any one of claims 1 to 5.   Ionizing radiation curing comprising an ionizing radiation curable resin, an oligo (2-hydroxy-2-methyl-1- (4-methylvinyl) phenyl) propanone, and an ultraviolet light absorber on an easily adhering polyester film having a retardation of 7000 nm or more The manufacturing method of an optical laminated body including the process of forming an optical functional layer by apply | coating, drying, and hardening an adhesive resin composition.