JP2008087392A - Laminate having photocatalyst layer and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminate, one having an organic coating film and a photocatalyst layer provided on its surface, which has the photocatalyst layer certainly prevented from the variation of gloss levels generated in overlaying a photocatalyst and controllable to any gloss level, and to provide its manufacturing method. <P>SOLUTION: The laminate having the photocatalyst layer is formed by providing at least one surface of the metal layer (5) with the organic coating film (4), forming the photocatalyst layer (2) on the surface of the organic coating film at least through the protective adhesive layer (3), and providing the releasable film (1) on the surface of the photocatalyst layer. The surface roughness of the releasable film is 0.1-1.0 μm in terms of the center line average roughness (Ra). In the manufacture of the laminate the transfer film (A) is arranged on the organic coating film (4) on the surface of the metal layer (5) and heated/pressurized at the condition of 50-150°C, and then the releasable film (1) is removed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a laminate having a photocatalyst layer and a method for producing the same. Specifically, it is a laminate such as a metal panel with an organic coating film and a photocatalyst layer on the surface, which can prevent changes in glossiness that occur when laminating the photocatalyst layer, and can be controlled to any glossiness The present invention relates to a laminate having a photocatalytic layer and a method for producing the same.

  A photocatalyst such as titanium oxide decomposes an organic substance and develops a hydrophilic function when irradiated with ultraviolet rays. The structure in which the photocatalyst is laminated on the surface of the base material is used in various applications because it has effects such as antifouling, antifogging, deodorizing, antibacterial / antifungal, and air purification. Examples of these applications include interior and exterior panels such as glass, metal plates, and metal resin composite plates.

However, the photocatalyst film coated on the panel or the like as described above has a problem that it becomes a glossy film having high glossiness regardless of the coating method. Therefore, as a technique for solving such a problem, for example, an intermediate layer that is not affected by the photocatalytic action is interposed between the surface layer portion of the substrate and the photocatalyst layer that is the surface layer, and inorganic fine particles (filler) are interposed in the intermediate layer. A technique for distributing the above has been proposed. The effect of adding inorganic fine particles is to use the fact that the refractive index is different from the base material of the intermediate layer, or to use the fact that the surface part or the inner surface of the intermediate layer is uneven to scatter incident light. Is to reduce the glossiness.
Japanese Patent No. 3717736

  By the way, in the technique of dispersing inorganic fine particles in the intermediate layer as described above, in order to ensure interlayer adhesion of the substrate surface layer portion / intermediate layer / photocatalyst layer, the filler is uniformly dispersed in the intermediate layer, or Fillers are concentrated and dispersed in the center of the intermediate layer. In the evaluation of interlayer adhesion, the amount of inorganic fine particles added and the peelability after being immersed in boiling water are evaluated.

  However, in the above technique, the interlayer adhesion decreases as the addition amount increases and the immersion time increases. That is, in order to ensure long-term adhesion, there is a problem that more strict adjustment is required when dispersing the inorganic fine particles in the intermediate layer.

  The present invention has been made to solve the above-described problems, and its purpose is a laminated body such as a metal panel having an organic coating film and a photocatalyst layer provided on the surface thereof, when laminating the photocatalyst. It is an object of the present invention to provide a laminate having a photocatalyst layer that can be reliably prevented from changing the glossiness and can be controlled to an arbitrary glossiness, and to provide a production method thereof.

  As a result of diligent research to solve the above problems, the present inventor has developed a peelable film having a surface roughness adjusted and a photocatalyst layer and a protective adhesive layer formed on the surface. It has been found that by laminating on an organic coating film, a change in glossiness generated when laminating a photocatalyst layer can be prevented and the glossiness can be controlled, and the present invention has been completed.

  That is, the gist of the present invention is that an organic coating film is provided on at least one surface of a metal layer, and a photocatalytic layer is formed on the surface of the organic coating film via at least a protective adhesive layer. In the laminate having a photocatalyst layer provided with a peelable film on the surface thereof, the peelable film has a surface roughness of 0.1 to 1.0 μm in centerline average roughness (Ra). It exists in the laminated body which has a photocatalyst layer to do.

  Another aspect of the present invention is a method for producing a laminate having a photocatalyst layer, wherein at least a photocatalyst layer and a protective adhesive layer are sequentially applied and laminated on the surface of a peelable film containing inert particles. A transfer film is produced, an organic coating film is applied to at least one surface of the metal layer, and the transfer film is disposed on the surface of the organic coating film so that the protective adhesive layer is in contact with the coating film. The photocatalyst is characterized in that the surface roughness of the photocatalyst layer is 0.1 to 1.0 μm in centerline average roughness (Ra) by peeling off the peelable film after heating and pressing under the conditions of It exists in the manufacturing method of the laminated body which has a layer.

  According to the present invention, since a peelable film having a specific surface roughness is used, it is possible to reliably prevent a change in glossiness that occurs when the photocatalyst layer is laminated, and to control the glossiness. Therefore, the phenomenon that the glossiness becomes higher than necessary due to the lamination of the photocatalyst layer can be suppressed. According to the present invention, since the photocatalyst layer (2) is formed by the transfer method using the above-described peelable film, the mass productivity can be enhanced by the transfer method.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, what is described below is an example of embodiments of the present invention, and the present invention is not limited to the following descriptions unless it exceeds the gist. Is not to be done. FIG. 1 is a cross-sectional view schematically showing an example of a layer structure of a laminate and a method for producing the laminate according to the present invention.

  The present invention can be applied to a metal resin composite plate or a metal plate used as an interior panel or exterior panel for buildings. FIG. 1 exemplifies a metal panel used as a building exterior material. A metal panel (laminated body) in which a symbol (C) in the figure is manufactured, and a painted metal plate in which (B) is a base material (A) shows a transfer film.

  As shown in the figure, the metal panel (C) which is the laminate of the present invention is provided with an organic coating film (4) on at least one surface of the metal layer (5), and the organic coating film (4). The photocatalyst layer (2) is formed on the surface of the photocatalyst layer via at least the protective adhesive layer (3), and the peelable film (1) is provided on the surface of the photocatalyst layer (2). And the surface roughness of a peelable film (1) is set to 0.1-1.0 micrometer by centerline average roughness (Ra).

  In this invention, there is no restriction | limiting in particular in resin which comprises the base material of a peelable film (1), A polyester-type resin is preferable. The polyester resin can be arbitrarily selected from known ones. However, since the peelable film (1) is heated under pressure in the transfer step of the transfer film (A) as described later, the material of the peelable film (1) is an aromatic polyester resin from the viewpoint of heat resistance. Is preferably selected. Specific examples include polyethylene terephthalate, polyethylene-2,6-naphthalate, polyethylene isophthalate, and polybutylene terephthalate.

  The thickness of the peelable film (1) is 10 to 100 μm, preferably 20 to 60 μm. The reason is as follows. That is, when the thickness of the peelable film (1) is 10 μm or less, the transferability is insufficient, and when it is 100 μm or more, wrinkles are likely to occur.

  In the present invention, in order to control the glossiness of the photocatalyst layer (2) in the transfer step of the transfer film (A), the surface roughness of the peelable film (1) is 0 as the center line average roughness (Ra). It is adjusted to 1 to 1.0 μm. As a method for imparting irregularities to the surface of the peelable film (1) or the photocatalyst layer (2), a sheet in which inorganic particles or organic particles inert to the resin constituting the substrate of the peelable film (1) is blended is used. A method of extruding and stretching the obtained sheet in at least a uniaxial direction is preferable.

  Examples of the inert particles include inorganic particles such as silica, titanium oxide, calcium carbonate, barium sulfate, alumina, kaolin, and clay, or resins that are incompatible with the resin constituting the base material of the peelable film (1). Organic particles such as particles can be mentioned, among which inorganic particles are preferable, and silica is particularly preferable in terms of particle size distribution and film forming property.

  The average particle size of the inert particles is usually 1 to 10 μm, preferably 3 to 8 μm. The reason why the average particle diameter of the inert particles is set in the above range is as follows. That is, when the average particle size is less than 1 μm, sufficient unevenness is not formed on the surface of the peelable film or photocatalyst layer, and when it exceeds 10 μm, the unevenness of the surface of the peelable film or photocatalyst layer is not formed. Becomes too large, causing problems such as dropout of particles and deterioration of film forming properties.

  The content of the inert particles is usually 0.2 to 5% by weight, preferably 1 to 3.5% by weight, as a ratio in the total formulation of the peelable film (1). The reason for defining the content of inert particles is as follows. That is, when the content is less than 0.2% by weight, sufficient unevenness is not formed on the film surface, and when it exceeds 5% by weight, the unevenness on the film surface tends to be too large.

  The surface roughness of the peelable film (1) is usually from 0.1 to 1.0 [mu] m, preferably from 0.15 to 0.60 [mu] m, and more preferably from 0.20 to 0.000 in terms of centerline average roughness (Ra). The range is 45 μm. Here, when the surface roughness of a peelable film (1) changes with film surfaces, it shall mean the surface which contact | connects a photocatalyst layer (2). When the surface roughness of the peelable film (1) is in the above range, the unevenness on the surface of the peelable film (1) is transferred to the photocatalyst layer (2), and sufficient unevenness is formed on the surface of the photocatalyst layer (2). In addition, the unevenness of the surface does not become too large, and problems such as dropout of particles and deterioration of film forming property are unlikely to occur.

  The surface roughness of the photocatalyst layer (2) is usually from 0.1 to 1.0 μm, preferably from 0.15 to 0.60 μm, more preferably from 0.15 to 0 in terms of centerline average roughness (Ra). The range is 40 μm. The reason for defining the surface roughness of the photocatalyst layer (2) is as follows. That is, when the surface roughness is 0.1 μm or less, the 60 ° glossiness of the photocatalyst film after transfer exceeds 80%, and when the surface roughness is 1.0 μm or more, particles are dropped during transfer. There arises a problem that the performance is lowered.

  Moreover, in order to improve the peelability of the peelable film (1) and the photocatalyst layer (2), a release layer (not shown) may be provided on the surface of the peelable film (1) as necessary. . As the release layer, a silicon compound, a thermosetting resin, a glass inorganic compound, or the like is preferably used.

  A transfer film (A) is produced using a peelable film (1) having a surface roughness adjusted within the above range, and a photocatalyst layer (2) on the surface of the transfer film (A) is coated with a coated metal plate (B ) To the organic coating film (4), a laminate capable of controlling the 60 ° glossiness to 10 to 80% can be obtained. Here, the 60 ° glossiness means the surface of the photocatalytic layer (2). If the 60 ° gloss is less than 10%, it tends to be difficult to improve stain resistance and weather resistance. On the other hand, when the 60 ° glossiness exceeds 80%, the glossiness tends to be too high when used for interior panels, exterior panels, and the like.

  The transfer film (A) is obtained by sequentially laminating a photocatalyst layer (2) and a protective adhesive layer (3) on the surface of the peelable film (1). The photocatalyst layer (2) is formed by applying and drying a coating liquid containing photocatalyst fine particles. Examples of the photocatalyst constituting the photocatalyst layer (2) include titanium oxide, zinc oxide, barium titanate, strontium titanate, tungsten oxide, manganese oxide, and ruthenium oxide. In particular, a combination of amorphous titanium oxide, anatase titanium oxide, brookite titanium oxide, and rutile titanium oxide is preferable from the viewpoints of safety, durability against chemicals, and transparency.

  As the photocatalyst coating liquid, both water-based and solvent-based liquids can be used, but it is preferable to use a photocatalyst coating liquid that is highly dispersed in an alcohol solvent that is relatively quick to dry. Examples of the photocatalyst coating solution that can be used in the present invention include an anatase type oxidation obtained by subjecting a titania sol solution, a titania gel body, or a titania sol-gel mixture to heat treatment in a sealed container and simultaneously pressurizing, and then dispersing and stirring. Examples thereof include titanium slurry.

  Examples of the photocatalyst coating liquid include a solution in which fine particles of a photocatalyst are uniformly dispersed in a silica compound binder. As the silica compound, 4, 3, and bifunctional alkoxysilanes, and condensates, hydrolysates, silicone varnishes, and the like of these alkoxysilanes can be used. The film thickness of the photocatalyst layer (2) is preferably about 0.05 to 1 μm in order to prevent generation of cracks.

  A protective adhesive layer (3) is further provided on the surface of the photocatalyst layer (2) (below the transfer film (A) in the illustrated state). Such a protective adhesive layer (3) has a function of blocking the photocatalyst layer (2) and the organic coating film (4) in order to prevent decomposition of the organic coating film (4) due to photocatalysis, and a photocatalytic layer. It has a function of adhering (2) and the organic coating film (4).

  As the coating liquid for forming the protective adhesive layer (3), a coating liquid containing zirconium oxide (zirconia) as a main component in an alcohol-based solvent is suitable, and the coating liquid is zirconium-n-propoxide, A first liquid in which zirconium alkoxide selected from the group consisting of zirconium tetramethoxide, zirconium ethoxide, zirconium isopropoxide and zirconium butoxide is usually mixed in an alcohol solvent in an amount of 1 to 30 wt%, preferably 5 to 15 wt%. In the alcohol solvent, water is usually 0.01 to 10 wt%, preferably 0.1 to 5 wt%, and the acid or alkali that is a precipitation inhibitor is 0.01 to 10 wt%, preferably 0 0.02-8 wt%, more preferably 0.05-5 wt% mixed Obtained by dropping the liquid (B liquid).

In this case, the particle diameter of the zirconium oxide (zirconia) in the coating composition is usually 0.5 to 100 nm, preferably 5 to 50 nm, more preferably 10 to 30 nm. Examples of alcohol solvents include alcohols represented by the structural formula of C _n H _{2n + 1} OH, such as methanol, ethanol, 1-propanol, isopropyl alcohol, 1-butanol, 2-butanol, isobutyl alcohol, and ter-butyl alcohol. , 1-pentanol, 2-pentanol, 3-pentanol and the like are used alone or in combination.

  An acidic substance or an alkaline substance is used as the precipitation formation inhibitor. Examples of the acidic substance include hydrochloric acid, nitric acid, sulfuric acid, oxalic acid, acetic acid and the like, and these are used alone or in combination. Examples of the alkaline substance include ammonia and amine compounds, and these are used alone or in combination. The acidic substance or alkaline substance which is a precipitation formation inhibitor is usually 0.0003 to 0.3 wt%, preferably 0.003 to 0.3 wt% in the coating solution for forming the protective adhesive layer (3). Preferably, 0.005 to 0.1 wt% is contained.

  As with the photocatalyst layer (2), the thickness of the protective adhesive layer (3) is preferably about 0.05 to 1 μm. The reason why the thickness of the protective adhesive layer (3) is specified in the above range is as follows. That is, if the thickness of the protective adhesive layer (3) is too thin, the function of preventing the decomposition of the organic coating film (4) due to photocatalytic action is difficult to be exhibited, and if it is too thick, cracks are likely to occur in the film.

  Examples of the coating method of the photocatalyst layer (2) and the protective adhesive layer (3) include a roll coater, a gravure coater, and a die coater. The coating solution for the photocatalyst layer (2) and the protective adhesive layer (3) is a state in which fine particles are dispersed in water or an organic solvent, and the solid content concentration is usually only about several percent from the viewpoint of storage stability. The viscosity of the resin is as low as several centipoise. Further, as described above, the coating film formed from this coating solution needs to have a film thickness of usually 0.05 to 1 μm, and a gravure coater method is particularly suitable as the coating method.

  A metal layer (5) is comprised with the metal sheet. As such a metal sheet, for example, a plate (sheet) made of metal such as aluminum, stainless steel, iron, copper, titanium, tin, nickel, or various alloys is used. In general, an aluminum sheet is preferable from the viewpoint of workability, heat transfer, rigidity, and the like. The lower limit of the thickness of the metal layer (5) is usually 0.1 mm or more, preferably 0.2 mm or more, while the upper limit is usually 2 mm or less, preferably 1 mm or less.

  Examples of the organic paint constituting the organic coating film (4) on the surface of the metal layer (5) usually include a fluorine resin, an acrylic resin, a polyester resin, a polyurethane resin, and the like. For exterior applications that require weather resistance and durability such as those, fluorine-based resins are particularly preferable.

  The lower limit of the thickness of the organic coating film (4) is usually 5 μm or more, preferably 10 μm or more, while the upper limit is usually 40 μm or less, preferably 30 μm or less. By setting the film thickness of the organic coating film (4) within the above range, the adhesion with the metal layer (5) can be improved, and the durability and weather resistance of the coating film can be increased. The organic coating film (4) can be formed by a coating method using a roll coater, curtain coater, die coater, etc., but the die coater method is preferred from the viewpoint of improving the smoothness of the coating film, mass productivity, and the yield of the paint. It is.

  Moreover, in the manufacturing method of the above metal panels (C), ie, the manufacturing method of the laminated body which has a photocatalyst layer based on this invention, on the surface of the peelable film (1) containing an inert particle, at least Then, a photocatalyst layer (2) and a protective adhesive layer (3) are sequentially applied and laminated to produce a transfer film (A). On the other hand, a coated metal plate (B) as illustrated in the figure is prepared by applying an organic coating film on at least one surface of the metal layer. Then, the transfer film (A) is placed on the surface of the organic coating film (4) of the coated metal plate (B) so that the protective adhesive layer (3) is in contact therewith, and heated at a temperature of 50 to 150 ° C. After pressurizing, the photocatalyst layer (2) is formed so that the peelable film (1) of the transfer film (A) is peeled off so that the surface roughness becomes 0.1 to 1.0 μm in centerline average roughness (Ra). ) Is exposed on the front side.

  In order to transfer the photocatalyst layer (2) and protective adhesive layer (3) of the transfer film (A) to the surface of the organic coating film (4) of the coated metal plate (B), transfer is performed using a heating / pressure roll. . The optimum conditions for the transfer by the heating / pressurizing roll are usually 50 to 150 ° C. and the pressure is 10 to 100 kg / cm (linear pressure), although it depends on the type of the organic coating film (4). The reason for setting the temperature and pressure during the transfer to the above ranges is as follows. That is, if the temperature at the time of transfer is in the above range, the transfer is sufficiently performed, the base resin is hardly deteriorated, and is not broken when the peelable film (1) is peeled off. Moreover, if the pressure at the time of transfer is in the above range, transfer is sufficiently performed, and it is not necessary to increase the equipment capacity more than necessary.

  As described above, according to the laminate of the present invention and the method for producing the same, the specific peelability adjusted to a predetermined surface roughness and having the photocatalyst layer (2) and the protective adhesive layer (3) formed on the surface. Since the film (1) is used, the change in glossiness generated when the photocatalyst layer (2) is laminated can be reliably prevented, and the glossiness can be controlled. Therefore, it is possible to suppress the phenomenon that the glossiness becomes higher than necessary due to the lamination of the photocatalyst layer (2). Moreover, according to this invention, since the photocatalyst layer (2) is formed by the transfer method using the above-described peelable film (1), the mass productivity can be improved.

  EXAMPLES Hereinafter, although this invention is demonstrated in detail based on an Example, this invention is not limited to the following description examples, unless the meaning is exceeded.

Example:
As shown in FIG. 1, a transfer film (A) and a painted metal plate (B) were produced, and a metal panel (C) (laminated body) was produced using them. And the surface roughness and glossiness of the metal panel (C) surface were evaluated.

(Preparation of transfer film (A))
As the peelable film (1), four types of PET mat films having different surface roughnesses were prepared. Each of these PET mat films contains silica and has a thickness of 25 μm, and each surface roughness measured by a measurement method described later is 0.44, 0.34 in terms of average roughness (Ra) between centers. 0.27, 0.20 μm. In addition, as a photocatalyst layer coating liquid constituting the photocatalyst layer (2), an anatase-type titanium oxide dispersion “Forium (registered trademark)” (manufactured by Kawasaki Heavy Industries, Ltd.) was prepared, and a protective adhesive layer (3) A photocatalytic intermediate agent “undercoat agent for folium” (manufactured by Kawasaki Heavy Industries, Ltd.) containing zirconia as a main component and containing zirconium hydroxide and zirconium alkoxide was prepared as a coating solution for a protective adhesive layer constituting the above. And after apply | coating with a gravure coater so that each film thickness may be set to 0.1 micrometer with respect to each said peelable film (1) in order of the coating liquid for photocatalyst layers, and the coating liquid for protective adhesive layers, at 80 degreeC. Four types of transfer films (A) were produced by heating for 1 minute. In addition, the glossiness of the surface of each peelable film (1) measured by the measurement method described later was as shown in Table 1.

(Preparation of painted metal plate (B))
Four aluminum sheets with a thickness of 0.5 mm were prepared as metal sheets constituting the metal layer (5). Moreover, “Lumiflon” (manufactured by Asahi Glass Coat and Resin Co., Ltd.), a solvent-soluble fluororesin paint, was prepared as an organic paint constituting the organic paint film (4). And after wash | cleaning each said aluminum sheet with water, the oil component adhering at the time of rolling was removed by the immersion in a degreasing liquid, and also it dried, after washing with hot water. Next, an organic coating was applied to each aluminum sheet with a die coater so that the coating thickness was 20 μm, and then heated at 230 ° C. for 1 minute to form an organic coating (4). In addition, as the organic coating material, a coating material in which the glossiness of the organic coating film (4) was 30% was selected.

(Manufacture of metal panels (C))
After producing the transfer film (A) and the painted metal plate (B) as described above, four types of transfer films are formed on the surface of the organic coating film (4) (fluororesin coating film) of each painted metal plate (B). By superimposing (A) so that the protective adhesive layer (3) is in contact with each other and transferring the protective adhesive layer (3) and the photocatalyst layer (2) to the organic coating film (4) using a thermal transfer roll. Four types of metal panels (C) were manufactured. The temperature during the transfer was 80 ° C., and the pressure was 40 kg / cm (linear pressure on the roll).

(Evaluation of metal panel (C))
About each metal panel (C) manufactured as mentioned above, it evaluated by measuring the following items. The measurement results are as shown in Table 1 as Examples 1-4.

(1) Measurement of surface roughness:
Using a surface shape measuring device “SE-1700α” manufactured by Kosaka Laboratory, the center line average roughness (Ra) of the peelable film (1) surface and the photocatalyst layer (2) surface was measured. In the surface shape measuring instrument, the tip diameter of the stylus was 2 μm, the measurement length was 5 mm, and the cutoff value was 0.8 mm. And in the measurement, the single side | surface of the sample was measured 5 times and the average value was employ | adopted as centerline average roughness (Ra).

(2) Measurement of glossiness (%):
Using a gloss meter “micro-TRI-gloss” manufactured by Gardner, according to JIS K-5600-4-7 (60 ° gloss), the surface of the peelable film (1), and the photocatalyst after transfer The glossiness of the surface of the layer (2) was measured. In the measurement, the number of measurements (n) was 3, and the average value was adopted as the glossiness (%).

(3) Measurement of transfer rate:
Since it is difficult to measure the film thickness of the protective adhesive layer (3) and the photocatalyst layer (2), the transfer rate is very small on the surfaces of the transfer film (A) and the metal panel (C) after transfer by fluorescent X-ray analysis. The strengths of Zr and Ti elements were measured and determined by the following calculation formula.

Comparative example:
Similar to the examples, the organic coating of the metal panel was used except that two types of PET mat films having a surface roughness of 0.08, 1.20 μm in average roughness between the centers (Ra) were used as the peelable film. A metal panel was manufactured by laminating a photocatalytic film on the film. And the surface roughness, the glossiness, and the transfer rate were measured as in the examples. The results are shown in Table 1 as Comparative Examples 1 and 2.

  As described above, the glossiness of the organic coating film (4) of the painted metal plate (B) before transfer is 30%. In the metal panel (C) produced in the example, as shown in Table 1. The photocatalyst is completely transferred, and the glossiness can be arbitrarily controlled in the range of 10 to 80%. On the other hand, the glossiness of the metal panel of Comparative Example 1 is abnormally high, and the glossiness of the metal panel of Comparative Example 2 can be lowered, but the transfer rate is lowered.

It is sectional drawing which shows typically an example of the layer structure of the laminated body which concerns on this invention, and the manufacturing method of a laminated body.

Explanation of symbols

1: peelable film 2: photocatalytic layer 3: protective adhesive layer 4: organic coating 5: metal layer A: transfer film B: painted metal plate C: metal panel (laminate)

Claims (7)

  An organic coating film is provided on at least one surface of the metal layer, and a photocatalyst layer is formed on the surface of the organic coating film via at least a protective adhesive layer, and a peelable film is provided on the surface of the photocatalyst layer. The laminated body which has a photocatalyst layer by which the surface roughness of the said peelable film is 0.1-1.0 micrometer by centerline average roughness (Ra).   The laminate having a photocatalyst layer according to claim 1, wherein the peelable film contains inert particles.   In the laminate having a photocatalyst layer in which an organic coating film is provided on at least one surface of the metal layer and a photocatalyst layer is formed on the surface of the organic coating film via at least a protective adhesive layer, the photocatalyst A laminate having a photocatalyst layer, wherein the surface roughness of the layer is 0.1 to 1.0 μm in terms of centerline average roughness (Ra).   A laminate having a photocatalyst layer, wherein the laminate having the photocatalyst layer according to any one of claims 1 to 3 has a 60 ° glossiness of 10 to 80%.   A method for producing a laminate having a photocatalyst layer, wherein at least a photocatalyst layer and a protective adhesive layer are sequentially applied and laminated on the surface of a peelable film containing inert particles to produce a transfer film, and at least a metal layer An organic coating film is applied to one surface, and the transfer film is disposed on the surface of the organic coating film so that the protective adhesive layer is in contact therewith, and after heating and pressing under a condition of 50 to 150 ° C., The manufacturing method of the laminated body which has a photocatalyst layer characterized by the surface roughness of the said photocatalyst layer becoming 0.1-1.0 micrometer by centerline average roughness (Ra) by peeling a peelable film.   The method for producing a laminate having a photocatalyst layer according to claim 5, wherein the inert particles are silica.   The method for producing a laminate having a photocatalyst layer according to claim 5 or 6, wherein the laminate having the photocatalyst layer has a 60 ° glossiness of 10 to 80%.