JP5974632B2 - Manufacturing method of coated film - Google Patents

Description

  The present invention relates to a method for producing a coated film.

  In recent years, with the development of personal computers, in particular with the development of portable personal computers, the demand for flat panel displays has increased. Recently, the penetration rate of flat-panel televisions for home use is also increasing, and the market for flat panel displays is expanding. In addition, flat panel displays that have become widespread in recent years tend to have larger screens, and particularly for home-use liquid crystal television sets. As such flat panel displays, various display methods such as a liquid crystal display, a plasma display, and an organic EL display are known. By the way, when such a display is viewed in a place exposed to outside light, there is a problem that it is difficult to see because the outside light is reflected on the front surface of the display, and a countermeasure against external light reflection has been desired.

  Under such circumstances, attempts have been made to achieve an antireflection effect against external light by disposing an antireflection film on the front surface of various displays, and various studies have been made on antireflection films.

  Various types of antireflection films are known. For example, Patent Document 1 discloses an antireflection film in which an uneven pattern having a period smaller than the shortest wavelength of incident light is formed on the surface of a substrate. Films (antireflection agents) have been proposed. Such a method uses the principle of a so-called moth-eye structure, and continuously changes the refractive index for light incident on the substrate, thereby eliminating the discontinuous interface of the refractive index. This prevents light reflection. However, the antireflection film having this configuration has a drawback that the uneven pattern is easily broken because the tip is thin.

  As an antireflection film that replaces this configuration, for example, Patent Document 2 proposes an antireflection film including a high refractive index layer having a metal oxide and a low refractive index layer having porous silica fine particles. According to the antireflection film as proposed in Patent Document 2, since the uneven surface does not exist on the film surface, it is advantageous in that a problem such as a reduction in the antireflection effect due to loss of the uneven pattern cannot occur. It can be said.

  The antireflective film proposed in the above-mentioned Patent Document 2 is formed by coating and drying a high refractive index agent having a metal oxide on a transparent substrate to form a high refractive index layer, and then forming porous silica fine particles It is produced by coating and drying a low refractive index agent having a high refractive index layer on a high refractive index layer. In other words, in order to produce the antireflection film proposed in Patent Document 2, it is necessary to separately form a high refractive index layer and a low refractive index layer, and there is a disadvantage that the number of steps increases accordingly. ing. In addition, since the high refractive index layer and the low refractive index layer are separately formed, the flatness of each layer is deteriorated.

  Recently, films have been proposed in which the functionality is changed in stages by laminating layers in which the content of functional components such as functional particles is changed in stages. By the way, in the field of antireflection films, etc., it is preferable that the slope of functionality between each layer is gentle. In other words, it is preferable that the refractive index has a slope that gently changes. However, when a manufacturing method in which each layer is formed stepwise as in the method proposed in Patent Document 2 above, the inclination between the layers becomes a so-called stepwise inclination. . In order to achieve a gentle slope, it is necessary to increase the number of layers constituting the film and gradually increase or decrease the content of the functional component, but in this method, The number of processes will increase.

Japanese Patent No. 4368384 JP 2009-69317 A

  This invention is made | formed in view of such a condition, and provides the manufacturing method which can manufacture with a simple method the coating film which has the inclination structure from which the compounding quantity of the functional material changed gently. This is the main issue.

This invention for solving the said subject is a manufacturing method of a coating film, Comprising: Two or more coating liquids containing active energy ray-curable resin and a solvent are simultaneously multilayer-coated on a base material. A coating step of forming a coating layer in which two or more layers are laminated, and a temporary drying step of temporarily drying the coating layer to remove a part of the solvent contained in the coating layer And a temporary curing step of irradiating active energy rays to cure a part of the active energy ray curable resin contained in the coating layer after the temporary drying step, and a coating layer after the temporary curing step. A main drying step of drying, and a main curing step of further irradiating the active energy rays to cure the coating layer after the main drying step, and at least one coating of the two or more coating liquids the liquid, includes functional material, wherein the coating step, among the two or more layers An active energy ray-curable resin is formed on the base material such that the coating liquid containing the functional material and the coating liquid containing the functional material and the coating liquid adjacent thereto are mixed at the interface. And a step of simultaneously applying two or more coating solutions containing a solvent .

  Moreover, in said invention, the viscosity of the whole coating layer after the said temporary curing process is 10 times or more and 100 times or less of the viscosity of the whole coating layer formed in the said coating process, The viscosity of the whole coating layer may be 1000 times or more of the viscosity of the whole coating layer formed in the coating step.

  In the above invention, the simultaneous multi-layer coating is performed until the temporary drying step is 60 parts or less when the total mass of the solvent contained in the two or more coating liquids is 100 parts. This is a step of drying the coated layer, and the final drying step is 10 parts or less when the total amount of the solvent contained in the coating liquid is 100 parts. The process of drying the coating layer after the said temporary hardening may be sufficient.

  According to the method for producing a coated film of the present invention, a coated film having an inclined structure in which the functional compounding amount is gently changed can be produced by a simple method.

It is process drawing for demonstrating the manufacturing method of the coating film of this invention.

  Hereinafter, the manufacturing method of the coated film of the present invention (hereinafter sometimes simply referred to as the manufacturing method of the present invention) will be specifically described with reference to the drawings. In addition, FIG. 1 is process drawing for demonstrating the manufacturing method of this invention.

<< Method for producing coated film >>
As shown in the process diagram of FIG. 1, the production method of the present invention includes a coating process (S1), a temporary drying process (S2), a temporary curing process (S3), a main drying process (S4), and a main curing process ( S5). Hereinafter, each step will be specifically described focusing on the case where the coating film of the present invention is an antireflection film. In addition, the coating film manufactured by the manufacturing method of the coating film of this invention is not limited to the use of the anti-reflective film shown below, but is variously requested | required to give a gentle inclination to functionality. Can be diverted to other applications.

<Coating process (S1)>
The coating step (S1) is a coating in which two or more layers are laminated on a base material by simultaneously applying two or more coating liquids containing an active energy ray-curable resin and a solvent. It is a process of forming a layer.

(Base material)
The substrate is not particularly limited. For example, when the coating film produced by the production method of the present invention is an antireflection film, for example, cellulose acylate, cycloolefin polymer, acrylate polymer, or polyester is mainly used. Can be mentioned. In addition, “mainly” means a component having the highest content ratio among the constituent components of the base material.

  Although there is no limitation in particular about the thickness of a base material, when using as a base material of an antireflection film, the thickness is 20 micrometers or more and 300 micrometers or less normally, Preferably they are 30 micrometers or more and 200 micrometers or less. Further, the substrate may be subjected to a coating treatment such as an anchor agent or a primer agent in addition to a physical treatment such as a corona discharge treatment or an oxidation treatment.

(Coating fluid)
Two or more coating liquids for forming a coating layer by simultaneous multilayer coating each contain an active energy ray-curable resin and a solvent. Moreover, a functional material is contained in at least 1 coating liquid among 2 or more coating liquids. The coating liquid other than the one coating liquid only needs to satisfy the condition that the activation energy curable resin and the solvent are included, and does not need to include a functional material. Hereinafter, coating liquids other than the coating liquid containing the functional material may be referred to as other coating liquids.

  The first feature of the production method of the present invention is that the two or more coating liquids containing at least the coating liquid containing the functional material are simultaneously applied in multiple layers, so that the functional material is mixed between the respective layers, or the other By shifting to the layer side, the amount of the functional material blended is to form an inclined structure in the coating layer that gently changes toward one of the two or more layers.

  More specifically, in this step, since a coating layer formed by laminating two or more layers by simultaneous multilayer coating is formed, the solvent remains in each layer constituting the coating layer, A solvent mixes at the interface of each layer which comprises a coating layer. Here, since functional materials are included in at least one of the two or more coating liquids used in this step, the coating liquid can be coated by simultaneously applying these coating liquids. Among the layers constituting the layer, the functional material is mixed together with the solvent at the interface between the layer containing the functional material and the layer adjacent to the layer. At this time, when the functional material is included in the adjacent layer, the functional material is mixed between the respective layers, and when the functional material is not included in the adjacent layer, the function is directed toward the adjacent layer side. Sex material migrates. Thereby, an inclined structure in which the blending amount of the functional material gradually changes toward one of the two or more layers is formed in the coating layer formed by laminating the two or more layers. Can do.

"solvent"
There is no particular limitation on the solvent contained in each of the two or more coating liquids. For example, acetone, diethyl ether, ethyl acetate, methyl acetate, dichloromethane, tetrahydrofuran, methanol, toluene, methyl ethyl ketone, and the like are used for preparing coating liquids. A conventionally known solvent can be appropriately selected and used as the solvent to be used. In addition, the solvent contained in each coating solution may be the same or different, but in consideration of the mixing of functional materials or the ease of migration, it is included in each coating solution. The solvents to be used are preferably the same substance or a substance having similar physical properties.

"Active energy ray curable resin"
The active energy ray-curable resin contained in each of the two or more coating solutions may be any resin that cures in response to electromagnetic waves or energy rays such as active energy rays, visible light, ultraviolet rays, and electron beams.

  Among the resins that cure in response to active energy rays, from the viewpoint of excellent coating suitability, easy formation of a uniform large-area coating film, and obtaining a high-strength film after curing, In particular, an ionizing radiation curable resin can be preferably used.

  As the ionizing radiation curable resin, a monomer, oligomer or polymer having a polymerizable functional group that undergoes a reaction such as polymerization or dimerization directly or indirectly by the action of an initiator when irradiated with ionizing radiation. Polymers can be used. Specifically, a radical polymerizable compound having an ethylenically unsaturated bond such as an acrylic group, a vinyl group or an allyl group, or a photo cationic polymerizable compound such as an epoxy group-containing compound can be used. Further, from the viewpoint of scratch resistance, a polyfunctional monomer having two or more photocurable groups in one molecule is preferable. As the polyfunctional monomer, pentaerythritol triacrylate (PETA), dipentaerythritol hexaacrylate ( DPHA), pentaerythritol tetraacrylate (PETTA), trimethylolpropane triacrylate (TMPTA), dipentaerythritol pentaacrylate (DPPA), isocyanuric acid EO-modified triacrylate, polyester triacrylate, and the like are preferably used. In addition to the polyfunctional monomer, for example, a polyalkylene oxide chain-containing polymer described in JP-A-2008-165040 can be used.

  The active energy ray-curable resin contained in each of the two or more coating solutions may be the same or different, but should be a resin sensitive to the same active energy ray. Is preferred.

"Functional materials"
A functional material is contained in at least one of the two or more coating liquids. The functional material is a material for imparting functionality to the coated film produced by the production method of the present invention, and can be appropriately selected according to the application for which the coated film is used.

  For example, when the coating film produced according to the present invention is used as an antireflection film, as a functional material, various hollow particles, titanium oxide, zirconia, zinc oxide, alumina, antimony oxide, plastic beads, silica, etc. Particles can be mentioned.

  In the present invention, as described above, a layer formed by a coating liquid containing a functional material (hereinafter, referred to as a coating liquid containing a functional material) by simultaneously applying two or more coating liquids containing a coating liquid having a functional material. In the interface between the first layer and the layer adjacent to the first layer (hereinafter referred to as the second layer), a functional material is mixed with the solvent or moved to the other layer side. Thus, a gradient structure in which the blending amount of the functional material gently changes toward one of the two or more layers is formed in the coating layer formed by laminating the two or more layers. .

  The coating liquid for forming the second layer may contain a functional material, but when the functional material is contained in the coating liquid for forming the second layer, It is necessary to consider this point.

(I) When the amount of the functional material per unit volume of the coating liquid for forming the first layer is smaller than the amount per unit volume of the coating liquid for forming the second layer;
In this case, the amount of the functional material per unit volume of the coating liquid for forming the second layer is the unit of the region where the solvent is mixed between the first layer and the second layer. It is necessary to set it to be larger than the amount of the functional material per volume. By setting it as such a structure, the inclination structure which the compounding quantity of a functional material increases gradually toward the 2nd layer side from a 1st layer can be formed.

(Ii) When the amount of the functional material per unit volume of the coating liquid for forming the first layer is larger than the amount per unit volume of the coating liquid for forming the second layer;
In this case, the amount of the functional material per unit volume of the coating liquid for forming the second layer is the unit of the region where the solvent is mixed between the first layer and the second layer. It is necessary to set it to be smaller than the amount of the functional material per volume. By setting it as such a structure, the inclination structure where the compounding quantity of a functional material reduces gradually toward the 2nd layer side from a 1st layer can be formed.

  As a method for preparing a coating liquid for forming a coating layer, the active energy ray-curable resin described above and a functional material added as necessary are prepared by dissolving or dispersing in a solvent. be able to. The coating liquid may contain other materials, for example, a curable resin other than the active energy ray curable resin, for example, a curable resin such as a thermosetting resin or a thermoplastic resin.

  There is no particular limitation on the method for simultaneously applying two or more coating liquids including one coating liquid containing at least a functional material, and various conventionally known methods such as a slot die coater, a curtain coater, a slide coater, and a roll coater. It can coat using an apparatus suitably. This method is sometimes referred to as simultaneous multilayer coating. In addition, in the simultaneous multi-layer coating referred to in the production method of the present invention, a so-called Wet on Wet that coats one coating solution and sequentially coats another coating solution without going through a drying step. Also referred to as methods. Also by this method, it is possible to form an inclined structure in which the amount of the functional material is gently changed in the coating layer.

  There is no particular limitation on the coating amount of each coating liquid. For example, when the coating film obtained by the production method of the present invention is an antireflection film, the coating amount is appropriately within a range that provides a desired refractive index. You only have to set it.

<Temporary drying step (S2)>
A temporary drying process (S2) is a process of drying a coating layer after a coating process (S1), and removing a part of solvent contained in a coating layer.

  In this step, since a part of the solvent contained in the coating layer is removed, the curing reaction of the active energy ray-curable resin contained in the coating layer can be sufficiently advanced in the temporary curing step described later. It is possible to finally obtain a coated film having sufficient strength. In addition, when the active energy ray is irradiated to the coating layer without removing a part of the solvent, the curing reaction proceeds in an insufficient state, and the coating film obtained by the production method of the present invention Cannot provide sufficient strength.

  Further, by removing a part of the solvent in this step, the amount of the solvent mixed between the respective layers can be reduced, and the progress of the migration of the functional material can be controlled. Specifically, in the above coating step, when the inclined structure that gently changes toward one of the two or more layers is sufficiently formed, the amount of solvent removed is increased. Thus, it can be controlled so that the progress of the migration of the functional material is slowed or hardly progressed. On the other hand, if a sufficient inclined structure is not formed in the above coating process, the solvent should be removed as appropriate within the extent that a sufficient curing reaction can proceed in the temporary curing process described later. Thus, further migration of the functional material can be advanced.

  There is no limitation in particular about the removal amount of the solvent in this process, It can set suitably within the range which can fully perform a curing reaction at a temporary curing process. When the amount of the solvent contained in the two or more coating liquids is 100 parts, and the amount of the solvent present in the coating layer after temporary drying exceeds 80 parts, a temporary curing step In this case, the curing reaction may not sufficiently proceed. Therefore, in consideration of this point, in this step, when the amount of the solvent contained in the two or more coating liquids is 100 parts, the amount of the solvent present in the coating layer after temporary drying is 80 It is preferable to remove the solvent in the coating layer so that the amount is less than or equal to 60 parts, preferably less than or equal to 60 parts.

  A method for removing a part of the solvent is not particularly limited. For example, a hot plate, an oven, a heating furnace, an infrared heater, a halogen heater, a hot air blower, or the like can be used.

  The time until the temporary drying is started is preferably within 30 seconds from the end of the coating step, and particularly preferably within 10 seconds.

<Temporary curing step (S3)>
A temporary hardening process (S3) is a process of irradiating an active energy ray and hardening a part of active energy ray curable resin contained in the coating layer after a temporary drying process (S2).

  In this invention, before performing this process, since part of the solvent contained in the coating layer is removed by the temporary drying process (S2), in this process, the curing of the active energy ray-curable resin is performed. The reaction can proceed sufficiently. Furthermore, in this invention, it has the main hardening process (S5) mentioned later, and since the hardening reaction of an active energy ray-curable resin is performed in two steps, surface roughness etc. arise on the coating layer surface. Can be prevented. In addition, when the active energy ray-curable resin is completely cured only by the one-stage curing process without providing the two-stage curing process as in the present invention, the surface of the resulting coated film is roughened. May occur or the adhesion to the substrate may deteriorate.

  There is no limitation in particular about the active energy ray used at this process, According to the kind of active energy ray curable resin used, it can select suitably. Examples of active energy rays include conventionally known electromagnetic waves or energy rays such as visible light, ultraviolet rays, and electron beams.

  Although there is no limitation in particular also about the hardening amount of active energy ray curable resin, the viscosity of the whole coating layer after completion | finish of this process is 10 times or more of the viscosity of the whole coating layer formed in the coating process mentioned above 100 It is preferable that it is hardened within a range that is twice or less. By curing so that the viscosity of the entire coating layer after this step is within this range, it becomes easier to control the formation of the inclined structure in which the blending amount of the functional material changes gently. Is preferable.

  The viscosity of the entire coating layer formed in the coating process, the viscosity of the entire coating layer after the completion of the temporary curing process, and after the completion of the main curing process, which will be described later, is applied to the rheometer (viscoelasticity measuring device). Can be measured by incorporating.

  The time until the temporary curing is started is preferably within 60 seconds after the completion of the temporary drying, and particularly preferably within 20 seconds.

<Main drying step (S4)>
The main drying step (S4) is a step of drying the coating layer after the temporary curing step (S3).

  In this step, the solvent remaining in the coating layer is removed by further drying the coating layer after temporary curing. Therefore, the migration of the functional material does not proceed after this step.

  There is no limitation in particular also about the drying method in this process, The various methods demonstrated by the temporary drying process mentioned above can be selected suitably, and can be used.

  In this step, it is not an essential requirement that the solvent contained in the coating layer be completely removed, but when the amount of the solvent contained in the two or more coating solutions is 100 parts. When the amount of the solvent present in the coating layer after the main drying exceeds 40 parts, there is a possibility that the migration of the functional material further proceeds. In other words, even if a gradient structure in which the blending amount of the functional material changes gradually through the provisional curing process, the transition of the functional material proceeds, so that Deviation may occur. In consideration of this point, in this step, when the amount of the solvent contained in two or more coating liquids used in the coating step is 100 parts, the amount of the solvent present in the coating layer after the main drying is determined. It is preferable to remove the solvent in the coating layer so that the amount is 40 parts or less, preferably 10 parts or less. The lower limit is not particularly limited and is 0 part.

<Main curing step (S5)>
The main curing step (S5) is a step of irradiating the active energy ray to cure the active energy ray curable resin contained in the coating layer after the main curing step (S4). By passing through this process, the coating film in which the coating layer which has the inclination structure in which the compounding quantity of the functional material changed gently on the base material was obtained.

  In the present invention, as described above, a part of the active energy ray-curable resin is cured in the temporary curing step before performing this step. Therefore, compared with the case where the active energy ray-curable resin is cured by irradiating with one active energy ray, it is possible to form a dense coating layer that does not cause surface roughness. In addition, the strength of the resulting coating layer can be increased.

  There is no limitation in particular about the active energy ray used at this process, According to the kind of active energy ray curable resin used, it can select suitably. As an active energy ray, the same thing as what was used at the temporary hardening process mentioned above can be used.

  There is no particular limitation on the curing amount of the active energy ray-curable resin, but the viscosity of the entire coating layer after the completion of this step is 1000 times or more of the viscosity of the entire coating layer formed in the coating step described above. It is preferable that it is cured. In other words, it is preferable to cure to the extent that there is no unreacted active energy ray-curable resin.

  As mentioned above, although the manufacturing method of the coating film of this invention was demonstrated, this invention is not limited to the said embodiment, You may add various changes in the range which does not deviate from the meaning of this invention.

  Hereinafter, the present invention will be described with reference to examples and comparative examples. “Parts” in the text are based on mass unless otherwise noted.

Example 1
A coating liquid 1 and a coating liquid 2 having the following composition are applied simultaneously on a PET film having a thickness of 50 μm using a slide coating apparatus, and the coating layer 1 and the coating layer 2 are formed on the PET film. The coating layer A laminated in order was formed. The thickness of each layer was 5 μm (the thickness of the coating layer A was 10 μm).

(Coating fluid 1)
・ 30 parts of UV curable polyfunctional acrylate resin (A-DPH, Shin-Nakamura Chemical Co., Ltd.)
・ Acetone 100 parts

(Coating fluid 2)
・ 30 parts of UV curable polyfunctional acrylate resin (A-DPH, Shin-Nakamura Chemical Co., Ltd.)
・ Acetone 100 parts ・ Silica fine particles 30 parts (organosilica sol, manufactured by Nissan Chemical Industries, Ltd.)

Subsequently, the coating layer A was heated at a temperature of 30 ° C. for 5 seconds to perform temporary drying of the coating layer A. Subsequently, the UV irradiating apparatus was used to irradiate the coating layer A with ultraviolet rays (200 mJ / cm ² ), and the UV curable polyfunctional acrylate resin contained in the coating layer A was temporarily cured.

The pre-cured coating layer A is heated at 60 ° C. for 80 seconds to perform the main drying to completely remove the solvent contained in the coating layer A, and then the coating layer A is irradiated with ultraviolet rays (300 mJ / Cm ² ), and the UV curable polyfunctional acrylate resin contained in the coating layer A was fully cured to obtain the coating film of Example 1.

(Comparative Example 1)
A coated film of Comparative Example 1 was obtained in the same manner as Example 1 except that the temporary curing was not performed.

(Comparative Example 2)
A coated film of Comparative Example 2 was obtained in the same manner as Example 1 except that temporary drying was not performed before temporary curing.

(Comparative Example 3)
A coated film of Comparative Example 3 was obtained in the same manner as Example 1 except that the main curing was not performed.

(Comparative Example 4)
In place of the coating layer A, a coating layer B obtained by coating and drying the coating liquid 2 having the above composition after coating and drying the coating liquid 1 having the above composition on a PET film having a thickness of 50 μm is obtained. It was. The coating layer B is heated at 60 ° C. for 80 seconds to perform main drying to completely remove the solvent contained in the coating layer B, and then the unreacted UV curable polyfunctional acrylate in the coating layer B Ultraviolet rays were irradiated until the resin disappeared, and the UV curable polyfunctional acrylate resin contained in the coating layer B was fully cured to obtain a coated film of Comparative Example 4.

(Color unevenness evaluation)
Color unevenness evaluation of the coating films of each Example and Comparative Example was performed. In addition, that the color unevenness evaluation is ◯ means that an inclined structure of silica fine particles is formed. The evaluation results are shown in Table 1.

Evaluation criteria: Visual evaluation with reflected light of a three-wavelength fluorescent lamp ○ ・ ・ ・ No rainbow unevenness △ ・ ・ ・ Slightly visible rainbow unevenness × ・ ・ ・ Many rainbow unevenness

(Coating hardness evaluation)
The coating film hardness of the coating film of each Example and a comparative example was evaluated based on the following evaluation criteria. The evaluation results are shown in Table 1.

Evaluation criteria: Pencil hardness test ○ ・ ・ ・ H or more △ ・ ・ ・ HB
× ・ ・ ・ B or less

  As is apparent from Table 1, according to the coating film of Example 1 manufactured according to the manufacturing method of the present invention, a color unevenness evaluation and a coating film showing that a functionally sloping structure was formed. Good results were obtained in both coating hardness evaluations indicating hardness. On the other hand, the coated film of Comparative Example 1 produced without pre-curing resulted in inferior color unevenness evaluation as compared with the coated film of Example 1. The same result was obtained for the coated film of Comparative Example 4 produced without simultaneous multilayer coating. In addition, the coated film of Comparative Example 2 produced without temporary drying was inferior in both color unevenness evaluation and coating film hardness evaluation as compared with the coated film of Example 1. Moreover, although the coating film of the comparative example 3 manufactured without performing this hardening was able to form a functional gradient structure, it became a result with insufficient coating-film hardness.

Claims (3)

A method for producing a coated film, comprising:
A coating step of forming a coating layer in which two or more layers are laminated by simultaneously applying two or more coating liquids containing an active energy ray-curable resin and a solvent on a substrate; ,
Temporary drying step of temporarily drying the coating layer to remove a part of the solvent contained in the coating layer;
A temporary curing step of irradiating an active energy ray to cure a part of the active energy ray curable resin contained in the coating layer after the temporary drying step;
A main drying step of drying the coating layer after the temporary curing step;
A main curing step of irradiating the active energy ray to further cure the coating layer after the main drying step;
A functional material is contained in any one of the two or more coating liquids,
The coating step is such that, among the two or more layers, the coating liquid containing the functional material and the coating liquid adjacent to the coating liquid containing the functional material are mixed at the interface. And the manufacturing method of the coating film characterized by being the process of carrying out simultaneous multilayer coating of the 2 or more coating liquid containing active energy ray-curable resin and a solvent on the said base material . The viscosity of the entire coating layer after the temporary curing step is not less than 10 times and not more than 100 times the viscosity of the entire coating layer formed in the coating step,
The viscosity of the whole coating layer after the said main curing process is 1000 times or more of the viscosity of the whole coating layer formed in the said coating process, The manufacture of the coating film of Claim 1 characterized by the above-mentioned. Method. In the temporary drying step, when the total mass of the solvent contained in the two or more coating liquids is 100 parts, the coating layer on which the simultaneous multilayer coating is performed is dried until it becomes 60 parts or less. Process
The final drying step dries the pre-cured coating layer until the residual amount of the solvent contained in the coating liquid is 10 parts or less when the total mass of the solvent is 100 parts. The manufacturing method of the coating film of Claim 1 or 2 characterized by the above-mentioned.

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