JP5135845B2 - LAMINATE MANUFACTURING METHOD AND OPTICAL FILM MANUFACTURING METHOD - Google Patents

Description

  The present invention relates to a method for producing a laminate in which a coating layer composed of particles and a binder matrix is laminated on a web-like support such as a plastic film by a die coating method using a die head. The present invention relates to a method for producing a laminate formed by laminating dispersed coating layers. Furthermore, the present invention relates to a method for producing an optical film in which light diffusion particles are used as particles and an antiglare layer is laminated on a web-like support.

  On the surface of various displays typified by a liquid crystal display, an optical functional layer for preventing a decrease in contrast and reflection of an image due to reflection of external light is provided. The optical functional layer includes a low refractive index thin film consisting of a single layer or stacked layers of metal or metal oxide formed by vapor deposition, ion plating, sputtering, etc., wire doctor coating, microgravure coating, die There is a low refractive index thin film containing a low refractive index agent composed of fluorine-based particles applied by a coating method or the like. On the other hand, as an optical functional layer that prevents the reflection of an image by scattering light due to surface unevenness with respect to light incident on external light, for example, the surface of the coating layer is embossed to prevent unevenness on the surface. There is an antiglare layer in which particles are mixed into a glare layer or a binder to form irregularities on the surface.

  An optical functional film such as an antireflection layer or an antiglare layer is required to have a uniform coating thickness or eliminate coating defects because of its functionality, and therefore requires a precise coating technique. For example, for the purpose of utilizing the light scattering phenomenon due to surface irregularities, the dispersibility of the particles is a problem in forming an antiglare layer by applying a coating liquid containing particles and a binder matrix forming material on a support. It becomes. If the dispersion of the particles is not uniform in the antiglare layer to be formed, the in-plane variation of the film thickness of the antiglare layer becomes large, which is confirmed as unevenness or streak-like defects.

  Therefore, in forming a coating layer by a die coating method using a die head in one of the methods for producing an optical functional layer, many methods have been proposed to solve various problems (Patent Documents 1 to 3). reference).

According to the method of Patent Document 1, an agitator is provided in a liquid feeding section from a liquid feeding tank to the inside of a die, the dispersibility is improved by disturbing the flow of the coating liquid, and the coating layer formed by the die coating method There is a method of suppressing film thickness unevenness and streak-like defects. According to the method of Patent Document 2, there is a method of suppressing the film thickness unevenness and streak-like defects of the formed coating layer by setting the Reynolds number in the pipe for introducing the coating liquid to the die to 25 or less. According to the method of Patent Document 3, by supplying a coating liquid larger than the coating amount to the liquid reservoir of the extruder communicating with the slit, by flowing out a part of the coating liquid in the liquid reservoir without passing through the slit, It is possible to suppress the aggregation of the coating liquid in the flow stagnation portion and to suppress the occurrence of vertical stripes in the formed coating layer.
JP 2004-321969 A JP 2005-305423 A JP 57-19060 A

  However, in the method described in Patent Document 1, even when the flow of the coating liquid in the liquid feeding section from the liquid feeding tank to the inside of the die is disturbed, if the uniformity is not maintained at the tip of the die lip, a coating layer is formed. However, it is difficult to avoid unevenness and streak-like defects due to uneven film thickness. Further, in the method described in Patent Document 2, even when the flow state before introducing the coating liquid into the die is defined, the film thickness unevenness of the coating layer in which the flow state of the coating liquid discharged from the die lip is formed or These are difficult to suppress because they greatly affect streak-like defects. Further, in the method described in Patent Document 3, there is a case where the discharge distribution of the coating liquid occurs in the width direction of the slit by pulling out the coating liquid. If the coating liquid is not pulled out accurately, defects such as film thickness unevenness may occur. There is sex.

  The present invention has been made in view of the above circumstances, suppresses coating defects such as film thickness unevenness and streaky defects in the coating layer, and uniformly disperses particles contained in the coating liquid in the coating layer. Accordingly, it is an object of the present invention to provide a method for manufacturing a laminate having uniform optical characteristics with small variations in the thickness of the coating layer in the surface.

In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that a coating liquid containing at least particles and a binder matrix forming material is applied to at least one surface of a web-like support that is continuously conveyed. A method for producing a laminate in which the coating layer is laminated on the support, the method further comprising a step of forming a coating layer comprising particles and a binder matrix on the support by discharging.
A d 10 hereinafter on 0.03 or more in average when a particle diameter is d ([mu] m) of the particles, and the support and the die head when the coating liquid ejected from the lip tip of the die head the shear rate generated in the flow field between the lip end D (1 / sec), D · H when the width of the downstream side of the lip end was H (mm) is 20 to 20,000, D is It was set as the manufacturing method of the laminated body characterized by being 1000 or less and H being 1 or more .

According to a second aspect of the present invention, there is provided a die head when the flow rate of the coating liquid discharged from the lip tip of the die head is s (cm ³ / min) and the coating width of the die head is l (cm). ^{2. The} method for producing a laminate according to claim 1, wherein a flow rate s / l (cm ² / min) per unit coating width is from 0.15 cm ² / min to 20 cm ² / min.

  The invention according to claim 3 is the method for producing a laminate according to claim 1 or 2, wherein the viscosity of the coating liquid is 1 mPa · s or more and 60 mPa · s or less.

  The invention according to claim 4 is characterized in that the distance between the support and the tip of the lip of the die head is not less than 50 μm and not more than 300 μm. It was set as the manufacturing method of the laminated body.

  Moreover, as invention which concerns on Claim 5, the conveyance speed of the said support body is 1 m / min or more and 80 m / min or less, The manufacture of the laminated body of any one of Claim 1 thru | or 4 characterized by the above-mentioned. It was a method.

Moreover, as invention which concerns on Claim 6, using the coating liquid containing a light-diffusion particle and a binder matrix formation material on a web-shaped support body, the laminated body of any one of Claims 1 thru | or 5 is used. According to the manufacturing method, an antiglare layer having a haze value of 5% or more and less than 50% was formed.

  By using the method for producing a laminate of the present invention, particles can be uniformly dispersed in a coating layer, coating defects such as unevenness and streak-like defects can be suppressed, and optical characteristics that are uniform in a plane. It was possible to obtain a laminate comprising

FIG. 1 shows an explanatory cross-sectional view of the laminate of the present invention.
The laminate 1 of the present invention is a laminate obtained by forming a coating layer 5 composed of particles 3 and a binder matrix 4 on at least one surface of a support 2. In the present invention, the coating layer 5 is formed by a die coating method using a die head. At this time, if the particles are not uniformly dispersed in the coating layer, the thickness of the coating layer to be formed is Increased variation is confirmed as unevenness or streak-like defects on the surface of the coating layer. Also, when light diffusing particles or low refractive particles are used as the particles, the optical properties change in the surface due to the particles not being uniformly dispersed in the coating layer, and confirmed as uneven or streak defects. Is done. Moreover, it becomes possible to form a coating layer continuously on a support body by making a support body into a web form.

  The laminate of the present invention is suitably used in the field of optical films where the dispersed state of particles is recognized as a defect on the product and uniform optical characteristics are required in the plane. In particular, the laminate of the present invention is used as an optical film that is suitably provided on the display surface among optical films. As the coating layer of the laminate of the present invention, an antiglare layer comprising light diffusing particles and a binder matrix, a low refractive index layer having an antireflection function comprising low refractive particles and a binder matrix, conductive particles and a binder matrix Examples thereof include an antistatic layer provided. At this time, the coating layer may form a plurality of types of particles. Moreover, in the laminated body of this invention, the other functional layer may be included and at least 1 layer of a laminated body should just be formed by the manufacturing method of this invention.

  In particular, in the present invention, it can be suitably used for an optical film in which an antiglare layer using light diffusing particles as particles is laminated on a support. In particular, in an optical film formed by laminating an antiglare layer having an antiglare layer having a haze value of 5 to 50%, an optical film having unevenness or streak-like defects when the dispersion of particles is not uniform within the antiglare layer. It becomes easy to be confirmed as a film, and it becomes impossible to obtain an optical film having uniform optical characteristics within the surface. Therefore, the present invention can be preferably used.

  Next, the manufacturing method of the laminated body of this invention is described.

FIG. 2 shows a schematic diagram of the die coating apparatus of the present invention.
The die coating apparatus of the present invention has a structure in which a die head 6 and a coating liquid tank 7 are connected by a pipe 8, and a liquid feeding pump 9 feeds the coating liquid in the coating liquid tank into a manifold part that is a liquid reservoir in the die head. It has become. The coating liquid fed into the manifold of the die head 6 discharges the coating liquid from the tip of the lip and applies the coating liquid onto the support 2. By using the rotary roll 10 using a web-like support, the coating layer can be continuously formed on the support by a roll-to-roll method.

The method for producing a laminate of the present invention includes a step of discharging a coating liquid containing at least particles and a binder matrix forming material from a lip tip of a die head to form a coating layer having particles and a binder matrix on the support. A method for producing a laminate in which the coating layer is laminated on the support,
A d 10 hereinafter on 0.03 or more in average when a particle diameter is d ([mu] m) of the particles, and the support and the die head when the coating liquid ejected from the lip tip of the die head the shear rate generated in the flow field between the lip end D (1 / sec), D · H when the width of the downstream side of the lip end was H (mm) is 20 to 20,000, D is 1000 or less, and H is 1 or more .

  In the die coating method using a die head, the present inventors control the flow field between the tip of the die lip from which the coating liquid is extruded and the support that runs continuously, whereby particles are formed in the formed coating layer. The present inventors have found that a uniformly dispersed laminate can be produced and have arrived at the present invention.

FIG. 3 shows an enlarged view of the tip of the lip of the die coating apparatus of FIG. When the coating liquid is applied onto a continuously running support by a die coating method using a die head, a flow velocity distribution is generated between the die lip tip 6 'from which the coating liquid is extruded and the continuously running support. The flow velocity distribution causes shearing in the flow field of the coating liquid formed between the support and the lip tip of the die head. Here, the shear rate D generated in the flow field between the support 2 and the lip tip 6 'of the die head is defined as V (m / s) as the conveyance speed of the support and L as the distance between the support and the die lip tip. Then, it can obtain | require by (Formula 1).
D = V / L (Formula 1)
Further, the flow field between the support 2 and the lip tip 6 'of the die head is formed up to a width H (mm) on the downstream side of the lip tip.

  In the present invention, when a coating liquid containing particles having an average particle diameter d of 0.03 μm or more and 10 μm or less is discharged from the lip tip of the die head, shearing occurs in the flow field between the support and the lip tip of the die head. Flow between the support and the lip tip of the die head is set so that D · H is 20 or more and 20000 or less when the speed is D (1 / sec) and the downstream width of the lip tip is H (mm). The particles are dispersed in the field, and a coating layer in which the particles are uniformly dispersed in the coating layer can be formed.

  In the coating liquid discharged from the lip tip of the die head, the particles are not uniformly dispersed. The coating liquid discharged from the lip tip is subjected to a shearing force in the flow field between the support and the lip tip of the die head. At this time, the shear rate that the coating liquid receives in the flow field is represented by D. On the other hand, the time during which the coating liquid is subjected to shearing changes depending on the width H at the downstream side of the lip tip, and the longer the width H at the downstream side of the lip tip is, the longer the time during which the coating solution is subjected to shearing. Therefore, by setting the value D · H obtained by multiplying the shear rate D and the width H on the downstream side of the lip tip to an appropriate value, the degree of particle dispersion in the coating layer can be controlled. is there.

  In the present invention, when the shear rate generated in the flow field between the support and the lip tip of the die head is D (1 / sec) and the downstream width of the lip tip is H (mm), D · H is 20 If this is not the case, the coating liquid cannot receive sufficient shear in the flow field between the lip tip of the die head. Therefore, since the coating liquid discharged from the lip tip in a state where the particles are not uniformly dispersed cannot be applied with sufficient shear to make the coating liquid uniform, the particles are dispersed unevenly. Thus, a coating layer is formed on the support, and unevenness and streaky coating defects occur in the obtained laminate.

  On the other hand, in the present invention, D · H where D (1 / sec) is the shear rate generated in the flow field between the support and the lip tip of the die head, and H (mm) is the downstream width of the lip tip. When the value exceeds 20,000, the coating solution is excessively sheared in the flow field between the lip tip of the die head, and the particles tend to aggregate in the coating solution. Accordingly, the particles are aggregated to form a coating layer on the support in a non-uniform dispersion state, and the obtained laminate has coating defects such as unevenness and streak-like defects.

  Moreover, the average particle diameter of the particle | grains used for this invention is 0.03 micrometer or more and 10 micrometers or less. When the average particle size of the particles used is less than 0.03 μm, the influence of the interaction between the particles is more than the influence of the shear that occurs in the flow field between the support and the lip tip of the die head due to the particles being too small. I will receive it greatly. On the other hand, when the average particle size of the particles used exceeds 10 μm, the particles are so large that the dispersion state of the particles in the coating liquid is controlled by the shear generated in the flow field between the support and the lip tip of the die head. It becomes difficult. The average particle size of the particles used in the present invention can be determined by a light scattering particle size distribution measurement method.

In the present invention, the unit coating width of the die head when the flow rate of the coating liquid discharged from the lip tip of the die head is s (cm ³ / min) and the coating width of the die head is l (cm). The per-flow rate s / l (cm ² / min) is preferably 0.15 cm ² / min or more and 20 cm ² / min or less.

When the flow rate per unit coating width of the die head when applied to the coating liquid and the support is less than 0.15 cm ² / min, a portion where the coating liquid stays in the die head is generated, and the dispersibility of particles in the coating liquid occurs. Becomes worse. Further, when the flow rate per unit coating width of the die head exceeds 20 cm ² / min, a flow rate distribution is likely to occur in the coating width direction, resulting in coating defects such as film thickness unevenness.

  In the present invention, the viscosity of the coating liquid used is preferably 1 mPa · s or more and 60 mPa · s or less. When the viscosity of the coating liquid used is less than 1 mPa · s, the discharge of the coating liquid tends to become unstable at the end of the lip tip of the die head. On the other hand, when the viscosity of the coating liquid used exceeds 60 mPa · s, it is difficult to stably discharge the coating liquid from the tip of the lip of the die head.

  In the present invention, the distance L between the support and the tip of the die lip is preferably 50 μm or more and 300 μm or less. When the distance L between the support and the tip of the die lip is less than 50 μm, excessive shear may be applied to the particles in the coating liquid, and on the contrary, it may not be uniformly dispersed. On the other hand, when the distance L between the support and the tip of the die lip exceeds 300 μm, sufficient shear does not occur for the particles in the coating liquid to be uniformly dispersed.

  In the present invention, it is preferable that the conveyance speed of the support is 1 m / min or more and 80 m / min or less. When the conveyance speed of the support is less than 1 m / min, sufficient shear does not occur so that the particles in the coating liquid are uniformly dispersed. On the other hand, when the distance L between the support and the tip of the die lip exceeds 300 μm, excessive shear may be applied to the particles in the coating liquid, and on the contrary, it may not be uniformly dispersed.

  As the web-like support used in the present invention, a plastic film can be used. The plastic film only needs to have appropriate transparency and mechanical strength. For example, polyethylene terephthalate (PET), triacetyl cellulose (TAC), diacetyl cellulose, acetyl cellulose butyrate, polyethylene naphthalate (PEN), cycloolefin polymer, polyimide, polyethersulfone (PES), polymethyl methacrylate (PMMA), A film such as polycarbonate (PC) can be used. Especially, when using the laminated body of this invention for the front surface of a liquid crystal display device, since there is no optical anisotropy, a triacetylcellulose (TAC) film is used preferably.

  The particles having an average particle size of 0.03 μm or more and 10 μm or less used in the present invention include silica particles, acrylic particles, acrylic-styrene particles, styrene particles, melamine particles, talc, various aluminosilicates, kaolin clay, MgAl hydrotalcite Or the like, or low-refractive particles such as calcium fluoride particles, magnesium fluoride particles, and porous silica particles, or conductive particles such as metal particles can be used, but is not limited thereto.

  As the binder matrix forming material used in the present invention, ionizing radiation curable materials such as ultraviolet curable materials and electron beam curable materials, thermosetting materials, thermoplastic resins, metal alkoxides and the like can be used.

  Examples of the ionizing radiation curable material used as the binder matrix-forming material of the present invention include polyfunctional acrylates such as polyhydric alcohol acrylic acid or methacrylic acid ester, diisocyanate and polyhydric alcohol, and hydroxy of acrylic acid or methacrylic acid. Examples thereof include polyfunctional urethane acrylates synthesized from esters and the like. Besides these, polyether resins having an acrylate functional group, polyester resins, epoxy resins, alkyd resins, spiroacetal resins, polybutadiene resins, polythiol polyene resins, and the like can also be used.

  Of the ionizing radiation curable materials used as the binder matrix forming material of the present invention, a photopolymerization initiator is added when an ultraviolet curable material is used. Although what kind of thing may be used for a photoinitiator, it is preferable to use what was suitable for the material to be used.

  Examples of the photopolymerization initiator (radical polymerization initiator) include 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, and 2-methyl [4- (methylthio) phenyl] morpholinopro. Pan-1-one, 2,2-dimethoxy-1,2-diphenylethane-1-one, benzophenone, 1- [4- (2-hydroxyethoxy) phenyl] -2-hydroxy-2-methyl-1-propane -1-one, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) butan-1-one, bis (2,6-dimethoxybenzoyl) -2,4,4-trimethylpentylphosphine oxide Etc. The addition amount of the photopolymerization initiator is preferably 0.1 to 10 parts by weight with respect to 100 parts by weight of the ultraviolet curable material.

  Examples of the thermosetting material used as the binder matrix forming material of the present invention include thermosetting urethane resins composed of acrylic polyols and isocyanate prepolymers, phenol resins, urea melamine resins, epoxy resins, unsaturated polyester resins, silicone resins, etc. Can be given.

  Examples of the thermoplastic resin used as the binder matrix forming material of the present invention include cellulose derivatives such as acetylcellulose, nitrocellulose, acetylbutylcellulose, ethylcellulose, methylcellulose, vinyl acetate and copolymers thereof, vinyl chloride and copolymers thereof, Vinyl resins such as vinylidene chloride and copolymers thereof, acetal resins such as polyvinyl formal and polyvinyl butyral, acrylic resins and copolymers thereof, acrylic resins such as methacrylic resins and copolymers thereof, polystyrene resins, polyamide resins, Linear polyester resin, polycarbonate resin, etc. can be used.

  As the inorganic or organic-inorganic composite matrix, a material using a silicon oxide matrix made of a silicon alkoxide material can be used. Specifically, tetraethoxysilane can be exemplified.

  When coating these particles and binder matrix forming material, a solvent can be added as necessary. At this time, the solvent is not particularly limited, but water, alcohols such as methanol, ethanol, isopropanol, butanol, 2-methoxyethanol, acetone, etc. in consideration of the stability of the composition and the volatility with respect to the coating layer. -Ketones such as methyl ethyl ketone and methyl isobutyl, esters such as methyl acetate, ethyl acetate and butyl acetate, ethers such as diisopropyl ether, glycols such as ethylene glycol, propylene glycol and hexylene glycol, ethyl cellosolve, butyl cellosolve and ethyl Glycol ethers such as carbitol and butyl carbitol, aliphatic hydrocarbons such as hexane, heptane and octane, halogenated hydrocarbons, aromatic hydrocarbons such as benzene, toluene and xylene, N-methylpyrrolidone, di It is suitably selected from such a solution of triethylsilane. These solvents may be used alone or as a mixture of two or more.

  In addition, in the coating liquid of the present invention, in addition to the particles and the binder matrix forming material, the photopolymerization initiator and leveling agent, the ultraviolet absorber, the infrared absorber, the antifouling agent, the water repellent, etc. Various additives can be added as needed.

  In the present invention, when a solvent is used for the coating liquid, a drying step for removing the solvent is performed after the step of applying the coating liquid by a die coating method using a die head on the support. It may be provided. In the case where an ionizing radiation curable material is used as the binder matrix forming material, a step of irradiating ionizing radiation such as an electron beam or ultraviolet rays is provided after the step of applying the coating liquid and the support. Further, when a thermosetting material is used as the binder matrix forming material, a heating step is provided. When a metal alkoxide is used as the binder matrix forming material, the metal alkoxide is hydrolyzed and a dehydration condensation cell forms a binder matrix. After the step of applying the coating liquid on the support, the heating step Is provided.

(Examples and Comparative Examples )
A coating layer was formed on the support as follows.
100 parts by weight of pentaerythritol triacrylate (manufactured by Kyoeisha Chemical Co., Ltd.) as a binder matrix forming material, 5 parts by weight of Irgacure 184 (manufactured by Ciba Specialty Chemicals) as a photopolymerization initiator, 100.5 parts by weight of toluene as a solvent, acrylic beads as particles (MP series, MX series, particle size: 0.5, 5.0, 10.0 μm, manufactured by Soken Chemical Co., Ltd.) 0.5 parts by weight were mixed to prepare a coating solution. The prepared viscosity was 5 mPa · s.

Next, a 650 mm wide triacetyl cellulose (TAC) film is used as a support that is continuously conveyed, and the coating liquid is applied onto the TAC film by a die coating method using a die head, followed by drying and ultraviolet curing steps. A coating layer serving as an antiglare layer was formed on the TAC film to produce an optical film (laminate). Here, the width H on the downstream side of the lip tip of the die head used was selected from 0.01, 0.05, 0.1, 1, 2 (mm) so that D · H was 20 or more and 20000 or less. The flow rate of the coating liquid extruded from the tip of the lip of the die head is 120 cm ³ / min, the coating width of the die head is 64 cm, and the flow rate per unit coating width of the die head is 1.875 cm ² / min. Further, the shear rate D generated between the TAC film and the lip tip of the die head was changed by adjusting the transport speed of the TAC film and the distance between the TAC substrate and the lip tip of the die head.

(Comparative example)
Acrylic beads with different particle diameters (MP series, MX series, particle diameters: 0.01, 5.0, 15.0 μm, manufactured by Soken Chemical Co., Ltd.) are used as particles, and the downstream width H of the lip tip of the die head is changed. Then, an optical film was produced in the same manner as in Examples and Comparative Examples except that the shear rate D generated between the TAC film and the lip tip of the die head was changed.

(Evaluation method)
In order to confirm whether the functional particles in the coating liquid are uniformly dispersed in the optical films produced in (Examples and Comparative Examples ) and (Comparative Examples), the film thickness distribution T and haze of the formed coating layer Distribution H was measured. The film thickness distribution T of the coating layer is expressed by the following equation when five points in the width direction of the formed optical film are measured, the maximum film thickness is Tmax, the minimum film thickness is Tmin, and the average film thickness is Tav.
T = (Tmax−Tmin) / Tav × 100
At this time, the average film thickness of the coating layer was measured using a contact-type film thickness meter (manufactured by Anritsu Electric).

Further, the haze distribution H of the coating layer is represented by the following formula, where the maximum haze is Hmax, the minimum haze is Hmin, and the average haze is Hav.
H = (Hmax−Hmin) / Hav × 100
At this time, haze was measured using a haze meter (NDH2000, manufactured by Nippon Denshoku Industries Co., Ltd.) based on JIS 7150-1981.

The evaluation of the laminates obtained in (Examples and Comparative Examples ) and (Comparative Examples) shows that when both the film thickness distribution and the haze distribution are 3% or more, only one of the cross mark and the film thickness distribution / the haze distribution is obtained. When it is less than 3%, it is represented by a triangle mark, and when both the film thickness distribution and haze distribution are less than 3%, it is represented by a circle mark.

The optical film produced by using the production method of the present invention was an optical film having small in-plane film thickness variation and haze variation, and uniform optical characteristics in the plane.

FIG. 1 is an explanatory sectional view of a laminate of the present invention. FIG. 2 is an explanatory schematic view of the die coating apparatus of the present invention. FIG. 3 is an enlarged view of the lip tip of the die coating apparatus of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Laminated body 2 Support body 3 Particle | grain 4 Binder matrix 5 Application layer 6 Die head 6 '(Die head) Lip tip 7 Coating liquid tank 8 Pipe 9 Feeding pump 10 Rotating roll 11 Coating liquid

Claims (6)

A coating liquid containing at least particles and a binder matrix forming material is discharged from at least one surface of a web-like support that is continuously conveyed from the lip end of a die head, and the particles and the binder matrix are provided on the support. A process for producing a laminate in which the coating layer is laminated on the support,
A d 10 hereinafter on 0.03 or more in average when a particle diameter is d ([mu] m) of the particles, and the support and the die head when the coating liquid ejected from the lip tip of the die head the shear rate generated in the flow field between the lip end D (1 / sec), D · H when the width of the downstream side of the lip end was H (mm) is 20 to 20,000, D is The manufacturing method of the laminated body characterized by being 1000 or less and H being 1 or more . The flow rate s / l per unit coating width of the die head when the flow rate of the coating liquid discharged from the lip tip of the die head is s (cm ³ / min) and the coating width of the die head is l (cm). The method for producing a laminate according to claim 1, wherein (cm ² / min) is 0.15 cm ² / min or more and 20 cm ² / min or less.   The method for producing a laminate according to claim 1, wherein the coating liquid has a viscosity of 1 mPa · s to 60 mPa · s.   The method for producing a laminate according to any one of claims 1 to 3, wherein a distance between the support and a lip tip of the die head is 50 µm or more and 300 µm or less.   The method for producing a laminate according to any one of claims 1 to 4, wherein a conveying speed of the support is 1 m / min or more and 80 m / min or less. The haze value is 5% or more and 50 by the method for producing a laminate according to any one of claims 1 to 5 , wherein a coating liquid containing light diffusing particles and a binder matrix forming material is used on a web-like support. A method for producing an optical film, wherein an antiglare layer of less than% is formed.

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