JP6606867B2 - Decorative steel sheet and method for producing decorative steel sheet - Google Patents

Description

  The present invention relates to a decorative steel sheet and a method for producing the same.

A decorative steel plate is roughly classified into one in which a resin sheet on which a pattern is formed is bonded to the steel plate, one in which the pattern is directly printed on the steel plate, and one in which the pattern is transferred to the steel plate using a transfer foil. Among these, the decorative steel sheet to which the pattern is transferred using the transfer foil is excellent in non-flammability because it does not include a resin sheet, and is excellent in design because the pattern can be formed by the direct gravure method.
Patent document 1 is mentioned as a decorative steel plate using the conventional transfer foil, for example. The decorative steel sheet described in Patent Document 1 uses a transfer foil to transfer a pattern made of pattern ink containing silicone oil onto the steel sheet, and a protective layer is applied thereon. With this configuration, the decorative steel sheet described in Patent Document 1 uses the effect that silicon oil repels the coating liquid, and the protective layer has design characteristics due to surface irregularities.

However, this decorative steel sheet has the following two problems.
1) Since the thickness of the concave portion of the protective layer is thin, discoloration or embrittlement due to light tends to occur in the pattern portion located below the thin portion.
2) Since the pattern containing silicon oil is difficult to transfer, the degree of freedom in terms of materials such as process conditions and pattern ink during transfer is small.

JP-A-5-212350

  This invention is made | formed in view of the above points, and it aims at providing the decorative steel plate which is excellent in a weather resistance, is easy to manufacture, and has high designability, and its manufacturing method.

As a result of intensive studies to solve the above-mentioned problems, the present inventors have confirmed that the layer structure of the decorative steel sheet is specific, so that it is excellent in weather resistance and design properties and can be easily manufactured by a transfer method. The headline, the present invention has been reached.
And the decorative steel sheet according to one aspect of the present invention for solving the problem is that, on the steel sheet, at least a pattern layer, an ultraviolet absorbing layer, an ink repellent layer having a predetermined pattern set in advance, and a protective layer are arranged in this order. The thickness of the protective layer that is formed and overlaps the ink repellent layer is thinner than the thickness of the protective layer that does not overlap the ink repellent layer.

  Further, in the method for producing a decorative steel sheet according to one aspect of the present invention, when a pattern layer, an ultraviolet absorbing layer, an ink repellent layer having a predetermined pattern set in advance, and a protective layer are formed in this order on the steel sheet After the transfer foil having the ultraviolet absorbing layer and the pattern layer formed in this order on the releasable support is heat-pressed to a steel plate, the releasable support is removed, so that at least the pattern layer and The ultraviolet absorbing layer is transferred to the steel plate, an ink repellent layer having a predetermined pattern is formed on the ultraviolet absorbing layer transferred to the steel plate, and a protective layer is formed on the formed ultraviolet absorbing layer or ink repellent layer. The above-mentioned protective layer is formed by applying a coating solution.

According to one aspect of the present invention, an ultraviolet absorbing layer, an ink repellent layer having a predetermined pattern, and a protective layer are formed in this order on the pattern layer, and the thickness of the protective layer stacked on the ink repellent layer is set relative to each other. Therefore, it is possible to provide a decorative steel sheet that is excellent in weather resistance, easy to manufacture, and high in design.
That is, in general, the protective layer is blended with an ultraviolet absorber to protect the internal layers from ultraviolet rays in the external environment. However, when designability is imparted by the surface irregularities of the protective layer, since the thickness of the concave portion of the protective layer is small, the amount of UV absorption is small, and there is a concern about deterioration such as discoloration and embrittlement of the pattern layer located under the concave portion. Is done. On the other hand, according to the aspect of the present invention, by providing the ultraviolet absorbing layer between the protective layer and the pattern layer, there are places where the protective layer is thin (including the case where there is no protective layer). However, the deterioration of the pattern layer can be suppressed.

Here, when the UV absorber is added directly to the pattern layer, the UV absorber affects the color tone of the pattern, and it becomes difficult to control the overall color tone especially in multi-color printing. The degree of freedom is limited.
Furthermore, according to one aspect of the present invention, an ink-repellent layer having a predetermined pattern is formed before the protective layer is formed, so that it is easy to form surface irregularities on the protective layer by using wet repellent ink. Has an effect.

It is sectional drawing which shows typically the decorative steel plate which concerns on embodiment based on this invention. It is sectional drawing which shows typically the transfer foil for manufacturing the decorative steel plate which concerns on embodiment based on this invention.

Next, embodiments of the present invention will be described with reference to the drawings.
Here, the drawings are schematic, and the relationship between the thickness and the planar dimensions, the ratio of the thickness of each layer, and the like are different from the actual ones. Further, the embodiment described below exemplifies a configuration for embodying the technical idea of the present invention, and the technical idea of the present invention is that the material, shape, structure, etc. of the component parts are as follows. It is not something specific. The technical idea of the present invention can be variously modified within the technical scope defined by the claims described in the claims.

<Decorative steel plate>
As shown in FIG. 1, the decorative steel sheet 200 of the present embodiment has a pattern pattern layer 3 having a predetermined pattern formed on one surface of a steel sheet 5 via an adhesive layer 4, and an ultraviolet absorbing layer 2 on the pattern pattern layer 3. Is formed on the entire surface. On the ultraviolet absorbing layer 2, an ink repellent layer 6 is formed in a predetermined pattern, and a protective layer 7 is further formed.
In the decorative steel plate 200 shown in FIG. 1, the case where the protective layer 7 is not formed on the ink repellent layer 6 is illustrated. For example, the protective layer 7 is hard to be formed on the ink repellent layer 6 by applying a coating liquid for forming the protective layer on the steel plate on which the ink repellent layer 6 having a predetermined pattern is formed. A decorative steel sheet 200 having a rugged surface as shown in FIG. A relatively thin protective layer may also be formed on the ink repellent layer 6.
Here, another layer may be provided between the steel plate 5 and the pattern layer 3 or between the pattern layer 3 and the ultraviolet absorbing layer 2.

<Production method>
The decorative steel plate 200 is manufactured, for example, by transferring the pattern layer 3 to the steel plate 5 using the transfer foil 100 shown in FIG.
The manufacturing method of the decorative steel sheet 200 of the present embodiment includes a transfer process, an ink repellent layer forming process, and a protective layer forming process.

(Transfer process)
In the transfer step, the design pattern layer 3 and the ultraviolet absorption layer 2 are transferred onto the steel plate 5 using the transfer foil 100 having the ultraviolet absorption layer 2 and the design pattern layer 3.
As shown in FIG. 2, the transfer foil 100 is configured by forming an ultraviolet absorbing layer 2 and a design pattern layer 3 on a releasable support 1. Further, an adhesive layer 4 is formed from above the picture pattern layer 3. In addition, the releasable support 1 has a release layer 12 formed on the transfer side surface of the film substrate 11.
With the adhesive layer 4 of the transfer foil 100 facing the steel plate surface, the transfer foil 100 is subjected to thermocompression bonding (laminating treatment) on the steel plate 5 surface. Thereafter, the releasable support 1 is peeled off and removed. For the transfer to the steel plate 5, a normal laminate line for steel plates can be used. The transfer foil 100 is thermocompression bonded to the steel plate 5 at a temperature of, for example, 80 ° C. or more and 200 ° C. or less, rapidly cooled to room temperature, and then released. The moldable support 1 is peeled off.
Thereby, the pattern layer 3 and the ultraviolet absorption layer 2 are formed on the steel plate 5 in this order.

<Ink repellent layer forming process>
Next, a coating liquid for forming an ink repellent layer is applied on the ultraviolet absorbing layer 2 in a predetermined pattern. As a result, an ink repellent layer 6 having a predetermined pattern is formed on the ultraviolet absorbing layer 2 transferred to the steel plate 5.
<Protective layer formation process>
After forming the ink repellent layer 6 in a predetermined pattern on the ultraviolet absorbing layer 2, a coating liquid for forming a protective layer is applied thereon. Thereby, the protective layer 7 having irregularities on the surface is formed.

<About each layer>
Next, each layer will be described.
(Releasable support)
The releasable support 1 is a transfer foil support. The releasable support 1 of this embodiment is an example of a configuration in which a release layer 12 is provided on a film substrate 11 to facilitate transfer.
The film substrate 11 is not particularly limited, but a polyester film is preferable from the viewpoints of strength, heat resistance, cost, and polyethylene terephthalate is particularly preferable.
The release layer 12 is not particularly limited, but a thermosetting resin is preferable from the viewpoints of heat resistance, strength, peelability, cost, and acrylic melamine and epoxy melamine are particularly preferable.

(UV absorbing layer)
The ultraviolet absorption layer 2 is a resin layer containing an ultraviolet absorber. That is, the ultraviolet absorption layer 2 includes an ultraviolet absorber and a resin component, and is provided to suppress deterioration of the pattern pattern layer 3 and the adhesive layer 4, which are lower layers, due to ultraviolet rays.
An ultraviolet absorber is not specifically limited, For example, it selects from a benzophenone series, a benzotriazole type, and a triazine series ultraviolet absorber suitably, and is used. Examples of the benzophenone ultraviolet absorber include 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, and 2-hydroxy-4-octoxybenzophenone. Examples of the benzotriazole ultraviolet absorber include 2- (2-hydroxy-5-methylphenyl) benzotriazole, 2- (2-hydroxy-5-t-butylphenyl) benzotriazole, 2- (2-hydroxy- 3,5-dimethylphenyl) benzotriazole. Examples of the triazine ultraviolet absorber include 2- [4,6-bis (2,4-dimethylphenyl) -1,3,5-triazin-2-yl] -5- (octyloxy) phenol, 2- (4,6-diphenyl-1,3,5-triazin-2-yl) -5- (hexyloxy) phenol is mentioned.
A resin component is not specifically limited, For example, it can select from various well-known materials, such as an acrylic resin, an epoxy resin, and a urethane resin, and can use it suitably.

(Pattern pattern layer)
The pattern pattern layer 3 is formed by printing pattern ink so as to form a predetermined pattern pattern. The pattern ink is not particularly limited, and various known materials such as vinyl chloride-vinyl acetate copolymer system and cellulose-based ink can be used.
The formation method of the pattern layer 3 is not particularly limited, and can be selected and used from various known printing methods such as gravure printing, flexographic printing, and screen printing. A printing method is preferred.

(Adhesive layer)
The material of the adhesive layer 4 is not particularly limited, and can be appropriately selected from various known materials such as an acrylic resin α-olefin resin, a urethane resin, and a vinyl chloride resin. It is a material having thermoplasticity.
The method for forming the ultraviolet absorbing layer 2 and the adhesive layer 4 on the releasable support 1 is not particularly limited, and various known coating methods such as various gravure coating methods, die coating methods, and roll coating methods may be used. it can. In particular, from the viewpoint of productivity, it is preferable that the ultraviolet absorbing layer 2, the pattern layer 3, and the adhesive layer 4 can be formed in a continuous in-line with a roller or the like.

(Steel 5)
The decorative steel plate 200 of the present embodiment is formed by transferring the adhesive layer 4, the pattern layer 3, and the ultraviolet absorbing layer 2 to the steel plate 5, then forming the ink repellent layer 6 having a predetermined pattern on the ultraviolet absorbing layer 2, and then Then, the protective layer 7 is formed by applying a coating solution for forming the protective layer 7.
In the steel plate 5 of the present embodiment, a base coating layer 52 is formed on the steel plate 51 that has been subjected to chemical conversion treatment in order to facilitate transfer.
For example, an acrylic, polyester, or melamine resin is used as the base coating layer 52, and a color pigment is added as necessary.

(Ink repellent layer)
The ink repellent layer 6 is formed by printing ink containing an ink repellent component and a resin binder in a predetermined pattern on the ultraviolet absorbing layer 2 transferred to the steel plate 5. This ink repellent layer 6 is provided to form irregularities on the surface of the protective layer by wetting and repelling the coating liquid of the protective layer 7.
As the ink repellent component constituting the ink repellent layer 6, silicone, alkylsilane, or the like can be used, and those appropriately selected according to the coating liquid composition for forming the protective layer 7 are used.

The silicone is not particularly limited, and nonreactive silicones such as dimethyl silicone, diphenyl silicone, alkyl-modified silicone, polyether-modified silicone, and fluoroalkyl silicone are preferably used. The alkylsilane is not particularly limited, and octyltriethoxysilane, decyltriethoxysilane, perfluorooctyltriethoxysilane, and the like are preferably used. These ink repellent components may be used alone or in combination.
The addition amount of the ink repellent component is 0.1 parts by mass or more and 5 parts by mass or less, more preferably 0.2 parts by mass or more and 2 parts by mass or less with respect to 100 parts by mass of the resin binder. If the amount added is less than 0.1 parts by mass, the coating liquid for forming the protective layer is not so wet in the coating formation of the protective layer, and the surface of the protective layer 7 may not be uneven. On the other hand, when the amount is more than 5 parts by mass, the ink repellent layer 6 is likely to have a problem with the adhesion to the ultraviolet absorbing layer 2.

Since the protective layer 7 is thin above the ink repellent layer 6, the resin binder needs to be considered for deterioration due to ultraviolet rays. A highly weather-resistant resin such as a fluororesin or a silicone resin may be used as the resin binder, but a general-purpose resin such as an acrylic resin, an epoxy resin, or a urethane resin can also be used by including an ultraviolet absorber in the ink repellent layer 6. be able to.
As the UV absorber, the same UV absorber as that contained in the UV absorbing layer can be used. However, since the film thickness of the ink repellent layer 6 may be limited by the process, a triazine type having a large absorption coefficient. It is preferable to use an ultraviolet absorber.

In addition, since the ink repellent layer 6 is positioned near the surface of the decorative steel plate 200 due to the wetting and repelling of the protective layer 7, it is also effective to add a light stabilizer in order to provide light resistance. Examples of the light stabilizer include bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis (1-octyloxy-2,2,6,6-tetramethyl-4-piperidyl) sebacate, Bis (1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate and the like can be mentioned.
Moreover, the ink repellent layer 6 does not necessarily need to be transparent as long as the overall design property is not impaired, and can be used to improve the design property by combining a colored ink repellent layer with a pattern. That is, the pattern of the ink repellent device is preferably synchronized with the pattern pattern of the pattern layer.

As the coloring material of the ink repellent layer 6, weather resistance and good inorganic pigments are preferable. In addition, since the inorganic pigment has a great hiding power, an effect of reducing the ultraviolet absorber can be expected. Examples of inorganic pigments include various composite oxides such as titanium oxide, zinc oxide, barium sulfate, carbon black, ferric oxide, ferric trioxide, iron oxyhydroxide, manganese oxide, copper oxide, and strontium chromate. Can be mentioned.
The method for forming the ink repellent layer 6 is not particularly limited, and can be selected and used from various known printing methods such as gravure printing, flexographic printing, and screen printing. An offset printing method is preferable.

(Protective layer)
The protective layer 7 is applied and formed on the surface of the steel plate 5 on which the ink repellent layer 6 is formed, and the coating liquid wets and repels on the ink repellent layer 6, thereby forming irregularities on the surface.
As the protective layer 7, various thermosetting resins, UV curable resins, EB curable resins, and the like are used, and can be appropriately selected from known materials such as urethane resins, epoxy resins, acrylic resins, and polyester resins.
Since the protective layer 7 is exposed to the external environment, it is necessary to consider weather resistance. On the other hand, a highly weather resistant resin such as a fluorine resin or a silicone resin may be used, or a general-purpose resin blended with an ultraviolet absorber or a light stabilizer may be used. Specific examples of the ultraviolet absorber and the light stabilizer are as described above.

Although the thickness of the protective layer 7 is not specifically limited, 5 micrometers or more and 100 micrometers or less are preferable, and 10 micrometers or more and 50 micrometers or less are especially preferable. If it is smaller than 5 μm, the surface unevenness is not sufficient from the viewpoint of design, and if it exceeds 100 μm, it becomes difficult to form a protective layer.
When the protective layer 7 includes a thermosetting resin, a baking heat treatment at a high temperature may be performed. In this case, an antioxidant or a resin stabilizer may be added to the ultraviolet absorbing layer 2, the pattern / pattern layer 3, the adhesive layer 4 and the ink repellent layer 6 in order to suppress thermal degradation.
Antioxidants include, for example, Benzenepropanoic acid, 3,5-bis (1,1-dimethyl-ethyl) -4-hydroxyl-C7-C9 branched alkyl esters (Irganox1135), Octadecyl-3- (3,5-di -tert.-butyl-4-hydroxyphenyl) -propionate (Irganox1076), Pentaerythritol tetrakis (3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate) (Irganox1010) (both manufactured by BASF Japan) Can be mentioned.
Examples of the resin stabilizer include a tin stabilizer such as Adeka Stub 465E, an epoxy stabilizer such as Adeka Sizer O130P, and a metal soap stabilizer such as Adeka Stub AC258 (all manufactured by ADEKA).

<Effects of this embodiment and others>
The decorative steel sheet of the present embodiment having the above configuration is excellent in weather resistance and design properties, and can be easily manufactured by a transfer method.
(1) Generally, the protective layer is blended with an ultraviolet absorber in order to protect each internal layer from ultraviolet rays in the external environment. Design properties are imparted by the surface irregularities of the protective layer, but the concave portion of the protective layer has a small thickness and therefore absorbs less ultraviolet light. Is done.
On the other hand, the decorative steel sheet 200 of this embodiment suppresses the deterioration of the pattern layer 3 by providing the ultraviolet absorption layer 2 containing an ultraviolet absorber. In addition, when an ultraviolet absorber is added directly to the pattern layer 3, it is not preferable because the ultraviolet absorber affects the color tone of the pattern, and it becomes difficult to control the overall color tone especially in multicolor printing.
(2) In the present embodiment, surface irregularities are formed on the protective layer 7 by utilizing wet repelling of the coating solution by the ink repellent layer 6 provided in advance in the coating formation of the protective layer 7. At this time, a configuration in which the protective layer 7 does not exist on the ink repellent layer 6 may be employed. This can be constituted by completely wetting and repelling the coating liquid of the protective layer 7.

(3) The ink repellent layer 6 includes an ink repellent component and a resin binder, the ink repellent component includes at least one compound selected from silicone and alkylsilane, and the amount of the ink repellent component added to 100 parts by mass of the resin binder However, it is 0.1 mass part or more and 5 mass parts or less.
The ink repellent layer 6 is preferably formed by a printing method. The ink repellency can be imparted by using an ink repellant resin alone in the printing ink or by adding an ink repellant component to the resin binder, but the latter having a wide degree of freedom in material selection is preferable. Silicone or alkylsilanes are used as the ink repellent component, and the ink repellency is moderately manifested by adding 0.1 to 5 parts by mass with respect to 100 parts by mass of the resin. If the ink repellency is excessive, a problem arises in the adhesion of the ink repellant layer to an adjacent layer such as an ultraviolet absorbing layer. Moreover, when ink repellency is insufficient, the coating liquid used for forming the protective layer cannot be repelled, and surface irregularities sufficient for imparting designability cannot be formed.

(4) The ink repellent layer 6 contains an ultraviolet absorber.
Since the ink repellent layer portion has a thin protective layer, the ink repellent layer 6 needs to be considered for deterioration due to ultraviolet rays. According to this configuration, a highly weather-resistant resin may be used as the binder resin of the ink repellent layer 6, but the choice of binder resin is increased by containing the UV absorbent in the ink repellent layer 6, and a method for producing a decorative steel sheet It will lead to easier.
Further, when an ultraviolet absorbent is added to the ink repellent layer 6, the amount of absorption to be applied to the ultraviolet absorbent layer 2 becomes small, so that the amount of ultraviolet absorbent added can be reduced. When the area ratio of the entire ink-repellent layer 6 is smaller than 0.5, the total amount of the UV absorber can be reduced in calculation. For example, when the pattern of the ink-repellent layer 6 is like a wood grain conduit The area ratio is much smaller than 0.5, and the effect of reducing the ultraviolet absorber is great.

(5) The ink repellent layer 6 contains an inorganic pigment.
The ink repellent layer 6 does not necessarily need to be transparent as long as the overall design is not impaired, and can be used to improve the design by combining the colored ink repellent layer 6 with a pattern. As the colorant, an inorganic pigment having good weather resistance is preferable. In addition, since inorganic pigments generally have a large hiding power, an effect of reducing ultraviolet absorbers can be expected.
(6) An adhesive layer is included between the steel plate 2 and the pattern layer 3.
Since the binder resin of the pattern layer 3 is limited in material due to reasons such as pigment color development, restrictions are imposed on the process conditions of the transfer process. However, the provision of the adhesive layer 4 alleviates the restrictions, and the manufacturing process of the decorative steel sheet 200 Is facilitated.
(7) The pattern of the ink repellent layer 6 and the pattern pattern of the pattern layer 3 are synchronized. When synchronized, it means that the patterns overlap in the thickness direction.
According to this configuration, for example, the design property is improved by matching the pattern of the pattern layer with the pattern of the ink repellent layer 6 having a wood grain conduit shape.

Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples.
The ink formulations used in the examples and comparative examples are shown below.
(UV absorbing layer)
Acrylic polyol:
6DY-204ED (solid content 40%) (Taisei Fine Chemical): 50 parts by weight UV absorber: Tinuvin 460 (BASF Japan): 0.5 part by weight UV absorber: Tinuvin 479 (BASF Japan): 0.5 part by weight Solvent: S770 (Toyo Ink Manufacturing): 49 parts by mass

(Pattern pattern layer)
Vinyl chloride-based ink: V351 each color (Toyo Ink Manufacturing): 70 parts by mass Solvent: S770 (Toyo Ink Manufacturing): 30 parts by mass Resin stabilizer: Adeka Sizer O130P (ADEKA): 5 parts by mass (adhesive layer)
Acrylic polyol:
6DY-204ED (solid content 40%) (Taisei Fine Chemical): 20 parts by weight Vinyl acetate resin: Solvain A (Nissin Chemical Industry): 12 parts by weight Antiblocking agent: Silicia 350 (Fuji Silysia Chemical): 1 part by weight Solvent : S770 (Toyo Ink Manufacturing): 67 parts by mass

(Ink repellent layer)
Vinyl chloride-based ink:
V351ME (solid content 20%) (Toyo Ink Manufacturing Co., Ltd.): 98.7 parts by weight Modified silicone: KF412: 0.2 parts by weight Ultraviolet absorber: Tinuvin 477 (BASF Japan): 1 part by weight Light stabilizer: Tinuvin 123 (BASF Japan) : 0.1 part by mass (protective layer)
Fluorine-containing polyol: GK570 (Daikin Industries): 50 parts by mass Isocyanate curing agent: D-120N (Mitsui Chemicals): 14 parts by mass Ultraviolet absorber: Tinuvin 400 (BASF Japan): 1.0 part by mass Solvent: Butyl acetate (Yamaichi) Chemical industry): 35 parts by mass

[Example 1]
The steel plate of Example 1 was formed as follows.
PET film with release layer (Toray film processing, therapy HP2, 50 μm thickness), UV absorption layer (2 μm thickness), pattern layer (3 grain colors + solid color, total thickness 1 to 3 μm) and adhesive layer (3 μm thickness) ) Were sequentially formed by gravure printing to produce a transfer foil.
A steel plate on which a polyester resin layer was formed as a base coating layer was preheated to 100 ° C. with a hot plate, and then the transfer foil was thermocompression-bonded using a roll transfer device (manufactured by Navitas, RH-300X) (linear pressure: 500 kgf / m, roll temperature: 120 ° C., 200 ° C., line speed: 1 m / min, 10 m / min). Immediately after the pressure bonding, the steel plate was rapidly cooled, and the PET film with a release layer was peeled off, thereby transferring the adhesive layer, the pattern layer, and the ultraviolet absorption layer to the steel plate.
An ink-repellent layer (wood color 1 color printing, 1 μm thickness) is formed on the ultraviolet absorbing layer on the steel plate by a gravure offset printing method, and then a protective layer forming ink is applied with a wire bar, followed by heat treatment at 200 ° C. for 1 min. A protective layer (20 μm thick) was formed. Thus, a decorative steel sheet having a surface unevenness corresponding to the ink repellent layer in the protective layer was obtained.

[Example 2]
A decorative steel sheet of Example 2 was produced in the same manner as in Example 1 except that no adhesive layer was formed in Example 1.
[Comparative Example 1]
A decorative steel sheet of Comparative Example 2 was prepared in the same manner as in Example 1 except that the ultraviolet absorbing layer and the adhesive layer were not formed in Example 1.
[Evaluation]
In each of the examples and comparative examples, whether or not transfer was possible under each transfer condition was examined, and regarding the samples that could be transferred, the appearance change before and after the sunshine weatherometer 2000h test was visually examined as UV resistance. The evaluation results are shown in Table 1.

  As shown in the evaluation results shown in Table 1, it can be seen that Example 1 is excellent in UV resistance. Further, in Example 2, it was confirmed that the transfer was impossible when the transfer speed was too high compared with Example 1, but UV resistance was obtained at the transfer speed. On the other hand, in Comparative Example 1, it was confirmed that the UV resistance was worse than that in Examples 1 and 2.

100: transfer foil 200: decorative steel plate 1: releasable support 2: ultraviolet absorbing layer 3: pattern layer 4: adhesive layer 5: steel plate 6: ink repellent layer 7: protective layer

Claims (10)

On the steel plate, a pattern layer, an ultraviolet absorbing layer, an ink repellent layer having a predetermined pattern set in advance, and a protective layer are formed in this order,
The thickness of the protective layer that overlaps the ink repellent layer is thinner than the thickness of the protective layer that does not overlap the ink repellent layer,
The thickness of the ink repellent layer is rather thin than the thickness of the protective layer in a portion that does not overlap with the ink repellent layer,
A decorative steel sheet , wherein the protective layer includes at least a fluorine-containing polyol and an isocyanate curing agent .   The decorative steel sheet according to claim 1, wherein the protective layer does not exist on the ink repellent layer. The ink repellent layer includes an ink repellent component and a resin binder,
The ink repellent component includes at least one compound selected from silicone and alkylsilane,
The decorative steel sheet according to claim 1 or 2, wherein the amount of the ink repellent component added is 100 parts by mass or more and 5 parts by mass or less with respect to 100 parts by mass of the resin binder.   The decorative ink sheet according to any one of claims 1 to 3, wherein the ink repellent layer contains an ultraviolet absorber.   The decorative ink sheet according to any one of claims 1 to 4, wherein the ink-repellent layer contains an inorganic pigment.   The decorative steel plate according to any one of claims 1 to 5, wherein an adhesive layer is formed between the steel plate and the pattern layer.   The decorative steel sheet according to any one of claims 1 to 6, wherein the predetermined pattern of the ink repellent layer and the pattern of the pattern of the pattern layer are synchronized. The thickness of the protective layer, decorative steel sheet according to any one of claims 1 to 7, characterized in that in the range of 5μm or 100μm or less. When forming a pattern layer, an ultraviolet absorbing layer, an ink repellent layer having a predetermined pattern set in advance, and a protective layer in this order on the steel plate,
After the transfer foil having the ultraviolet absorbing layer and the pattern layer formed in this order on the releasable support is heat-pressed to the steel sheet, the releasable support is removed, so that at least the pattern layer And transferring the ultraviolet absorbing layer to the steel plate,
An ink repellent layer having a predetermined pattern is formed on the ultraviolet absorbing layer transferred to the steel plate,
The protective layer is formed by applying a coating solution for forming a protective layer on the ultraviolet absorbing layer or ink repellent layer thus formed so that the thickness of the ink repellent layer is thinner than the thickness of the protective layer. ,
The coating liquid for forming the protective layer contains at least a fluorine-containing polyol and an isocyanate curing agent . The method for producing a decorative steel sheet according to claim 9 , wherein the protective layer is formed so that the thickness of the protective layer is in the range of 5 µm to 100 µm.

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