JP5887722B2 - Transfer foil for producing a hydraulic transfer sheet, hydraulic transfer sheet and method for producing the same, and method for producing a decorative molded product - Google Patents

Description

  The present invention relates to a transfer foil for producing a hydraulic transfer sheet suitable for forming a transfer layer suitable for forming a transfer layer on the surface of a molded body having a three-dimensional surface or a curved surface by unevenness, and a hydraulic transfer obtained by using the transfer foil. The present invention relates to a sheet, a decorative molded product, and a manufacturing method thereof.

For automobile interior products, home appliances, OA equipment, etc., molded products having decorations such as wood grain or metallic tone (metallic luster) on the surface are used. Many of these molded articles have a complicated three-dimensional shape, and conventionally, a method for simply applying a highly designed decoration to a molded article having the complicated shape has been studied.
As such a decoration method, a water pressure transfer method using water pressure is known. In this hydraulic transfer method, a transfer film in which a desired decorative layer is printed on a water-soluble or water-swellable water-soluble film is prepared, and an activator containing an organic solvent is applied to the decorative layer of the transfer film, The decorative layer is swollen and adhered (this is called activation). Before or after that, the transfer film is floated on the water surface with the decorative layer (printing layer) surface for transfer as the upper surface, and then the article to be transferred is pressed onto the transfer film by water pressure. After the transfer film is brought into intimate contact with the transfer surface of the transfer object to be decorated, the water-soluble film is removed and the decoration layer is transferred (see, for example, Patent Document 1).

  The water-soluble film used in such a hydraulic transfer method is derived from the property of being water-soluble, and easily absorbs moisture in the air to cause curling, and when a decorative layer is formed on the water-soluble film, The film expands and contracts under the influence of humidity, which may adversely affect the design of the decorative layer.

JP 54-33115 A

  Under such circumstances, the present invention prevents curling, blocking and deterioration of design properties caused by moisture in the air, which occurs when the hydraulic transfer sheet is stored for a long period of time, and has good transfer stability. It is an object of the present invention to provide a hydraulic transfer sheet having

As a result of intensive research to solve the above problems, the present inventor manufactured a hydraulic transfer sheet using a transfer foil for manufacturing a hydraulic transfer sheet, and then manufactured a decorative molded product using the hydraulic transfer sheet. It has been found that the above problems can be solved by doing so. The present invention has been completed based on such findings.
That is, the present invention
1. A transfer foil for producing a hydraulic transfer sheet, comprising a release film, a decorative layer on which an uneven pattern is formed, and a water-soluble primer layer in this order.
2. 2. The transfer foil for producing a hydraulic transfer sheet according to 1 above , having a release layer between the release film and the decorative layer on which the uneven pattern is formed .
3 . Hydraulic transfer sheet for manufacturing a transfer foil according to the above 1 or 2, wherein the water-soluble primer layer comprises a polyvinylpyrrolidone resin.
4 . The step of applying an activator to the water-soluble primer layer side and / or the water-soluble film of the transfer foil for producing a hydraulic transfer sheet according to any one of 1 to 3 , and the water-soluble primer layer of the transfer foil for producing a hydraulic transfer sheet A method for producing a hydraulic transfer sheet, comprising a step of laminating a water-soluble film on the side and a step of peeling the release film.
5 . An activator is applied to the water-soluble primer layer side and / or the water-soluble film of the transfer foil for producing a hydraulic transfer sheet, which has a release film, a decorative layer on which an uneven pattern is formed, and a water-soluble primer layer in this order. a step, a step of obtaining a hydraulic transfer sheet and laminating a water-soluble primer layer side to the water-soluble film of the water pressure transfer sheet for manufacturing a transfer foil, by a step of peeling the release film, the decorative layer of the hydraulic transfer sheet A step of applying and softening an activator on the side, a step of bringing the hydraulic transfer sheet into close contact with the transfer surface of the transfer body, and a water-soluble film and a water-soluble primer layer remaining on the transfer surface of the transfer body A method for producing a decorative molded product, comprising: a film removal step for removing water.
6 . A hydraulic transfer sheet comprising a water-soluble film, a water-soluble primer layer, a decorative layer, and a release layer on which an uneven pattern is formed in this order.

  By using the transfer foil for producing a hydraulic transfer sheet of the present invention, it is possible to easily produce a hydraulic transfer sheet before using the hydraulic transfer sheet, so that air generated when the hydraulic transfer sheet has been stored for a long time in the past. It is possible to provide a hydraulic transfer sheet having good transfer stability by preventing curling, blocking and deterioration of design properties due to moisture in the inside.

It is a schematic sectional drawing which shows an example of a structure of the transfer foil for hydraulic transfer sheet manufacture of this invention.

<Transfer foil for hydraulic transfer sheet production>
Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing an example of the configuration of a transfer foil for producing a hydraulic transfer sheet of the present invention.
The transfer foil 1 for producing a hydraulic transfer sheet of the present invention has a release film 2, a decorative layer 4 and a primer layer 5 in this order, and the release layer 3 is formed between the release film 2 and the decorative layer 4. Alternatively, an uneven pattern 6 may be formed between the release layer 3 and the decorative layer 4.

[Peeling film]
The release film 2 in the transfer foil for producing a hydraulic transfer sheet of the present invention is not particularly limited as long as it is a film that can be peeled off after coming into contact with the release layer 3 or the decorative layer 4. However, water-insoluble ones and high heat-resistant ones are preferred. Specifically, a film made of polyethylene terephthalate, polyethylene, polypropylene or the like, a stretched film, papers, or a film obtained by coating them with a release agent such as silicone and then performing a release treatment. The release film 2 is preferably one that has been subjected to a release treatment because it is easy to peel off.

[Peeling layer]
The release layer 3 in the transfer foil for producing a hydraulic transfer sheet of the present invention may be a layer that can be peeled later even if it comes into contact with the release film 2. For example, an acrylic resin or a vinyl chloride vinyl salt excellent in peelability. Examples include resins (copolymers of vinyl chloride and vinyl acetate), olefin resins, silicone resins, fluorine resins, and those containing various resins modified with silicone or fluorine. If necessary, wax can be mixed. it can. Moreover, what contains the polyvinyl pyrrolidone resin used for the below-mentioned primer layer 5 is also used preferably.

  As the above-mentioned wax, various waxes that melt and exhibit releasability during transfer are preferable. Suitable waxes include, for example, microcrystalline wax, carnauba wax, paraffin wax, Fischer-Tropsch wax, various low molecular weight polyethylene, wood wax, beeswax, whale wax, ibota wax, wool wax, shellac wax, candelilla wax, Various waxes such as petrolactam, partially modified wax, fatty acid ester, fatty acid amide and the like can be mentioned. Particularly preferred waxes are microcrystalline wax and carnauba wax which have a relatively high melting point and are hardly soluble in a solvent.

[Decoration layer]
The decorative layer 4 in the transfer foil for producing a hydraulic transfer sheet of the present invention is for decorating a decorative molded product to be described later. Specifically, the decorative layer 4 preferably includes a metal thin film layer, and is further designed for pattern printing. Layers may be included.

[Metal thin film layer]
As a material for the metal thin film layer, for example, a metal such as aluminum, chromium, nickel, cobalt, copper, gold, silver, tin, zinc, brass, stainless steel, an alloy, a metal oxide, or the like can be used. Examples of the metal oxide include aluminum oxide and silicon dioxide. Of these, aluminum is preferred from the viewpoint of crack formation. The thickness of the metal thin film layer is usually preferably 100 to 800 mm from the viewpoint of crack formation, and more preferably 200 to 600 mm.

[Uneven pattern]
In the transfer foil for producing a hydraulic transfer sheet of the present invention, the uneven pattern 6 may be formed on the decorative layer 4. As a method for forming the concavo-convex pattern 6, after forming the release layer 3 on the release film 2, embossing is performed on the release layer 3, and then the decorative layer 4 is formed (method 1). Examples include a method (Method 2) of forming the release layer 3 and the decorative layer 4 on the release film 2 on which is formed, a method of changing the thickness when forming the release layer 3 (Method 3), and the like. However, when the present invention is applied in the method 1, as described later, since the water-soluble film does not exist at the time of embossing to form the concavo-convex pattern 6, the water-soluble film is prevented from being deteriorated due to the heat condition at the time of embossing. It is particularly preferable because the transferability of the decorative layer 4 becomes good.
The concavo-convex pattern 6 is not particularly limited as long as it corresponds to the glitter design expression. For example, lined groove, wood grain conduit groove, wood grain annual ring pattern, sand grain pattern, stone grain pattern, metal crystal surface pattern, cloth pattern, satin pattern, leather pattern, matte surface pattern, hairline pattern, spin tone pattern, character , Symbols, geometric figures and the like. The depth of the concavo-convex pattern 6 is preferably 3 to 50 μm from the viewpoint of crack formation.

Originally, the water pressure transfer method is an excellent curved surface decoration method in terms of “depth” such as a clear paint feeling, adaptability to a three-dimensional surface, and high quality pattern expression. There was a problem when trying to give a more excellent luxury feeling with the addition of glitter such as “shine”. That is, when embossing is performed on a hydraulic transfer sheet having a water-soluble film with low heat resistance as a base material in order to provide a concavo-convex pattern that can express various glitters, the embossing temperature cannot be set high, It was difficult to form a concavo-convex pattern having a sufficient depth.
On the other hand, in this invention, since a thing with high heat resistance can be selected as a base material (peeling film 2), the embossing temperature at the time of embossing the peeling layer 3 and forming the uneven | corrugated pattern 6 ( That is, the degree of freedom of the depth of the uneven pattern is high, and therefore, more various glitter designs can be expressed.
As mentioned above, this invention is especially useful in the aspect by which the uneven | corrugated pattern 6 is formed between the peeling layer 3 and the decoration layer 4, and the aspect in which the decoration layer 4 is a metal thin film layer.

[Picture printing layer]
A pattern printing layer (not shown) can be provided between the primer layer 5 and the metal thin film layer. It is preferable to use the same resin as the primer layer 5 as the binder resin for the pattern printing layer. As the colorant, those conventionally used are used.

[Primer layer]
Since the primer layer 5 remains on the outermost surface when a hydraulic transfer sheet of the present invention described later is laminated on the transfer target, the primer layer 5 is preferably water-soluble when removed by washing with water. More specifically, the primer layer 5 preferably contains a polyvinyl pyrrolidone resin. In that case, it may be composed of a polyvinyl pyrrolidone resin alone or may be composed of a resin composition containing a polyvinyl pyrrolidone resin.
The polyvinyl pyrrolidone resin is a polymer compound obtained by polymerizing N-vinyl-2-pyrrolidone, dissolves in water, and has good water swellability. By using this polyvinylpyrrolidone resin, the primer layer 5 swells at an appropriate speed during hydraulic transfer, so that the metal thin film layer does not crack unevenly (cracks), and uniform fine cracks (cracks). Will occur. As a result, the uneven pattern 6 formed between the primer layer 5 and the metal thin film layer is difficult to break and is maintained well, so that the decorative molded product that is the transfer object can exhibit excellent glitter. .
In addition, since the polyvinyl pyrrolidone resin has a water swelling speed that is not too fast, it can be transferred to a transfer target with an appropriate time for the activation step after the hydraulic transfer sheet is suspended on the water surface.
In the resin composition containing the polyvinyl pyrrolidone resin, the water-soluble polymer may be added to the polyvinyl pyrrolidone resin as desired, or a rubber component such as mannan, xanthan gum, guar gum, or the like may be added. . By adding these, the water swelling speed can be adjusted to be optimal for the desired hydraulic transfer process.

  The thickness of the primer layer 5 is preferably 0.5 to 20 μm. If it is this range, a fine crack (crack) will generate | occur | produce more uniformly in a metal thin film layer, the more suitable time of an activation process can be ensured, and it can transfer to a to-be-transferred body more suitably. From these viewpoints, 1 to 6 μm is more preferable.

The transfer foil for producing a hydraulic transfer sheet can be produced by forming the decorative layer 4 on the release film 2 and then forming the primer layer 5, and preferably the required release layer on the release film 2. 3 is formed, an uneven pattern 6 is formed on the surface of the release layer 3 by embossing, a decorative layer 4 is formed on the surface of the release layer 3 on which the uneven pattern 6 is formed, and a primer layer 5 is formed on the surface of the decorative layer 4 It can manufacture by forming.
The release layer 3 and the primer layer 5 can be laminated by a known coating method or printing method, a co-extrusion method with the release film 2, or by laminating a resin film on the release film 2 or the decorative layer 4.
Known coating methods include gravure coating, reverse coating and the like, and known printing methods include gravure printing and the like.
The embossing applied to the surface of the release layer 3 is usually carried out by an embossing apparatus at a temperature of 80 to 125 ° C. and applying a pressure of 20 to 100 ton / m ² , preferably 20 to 60 ton / m ^2. The uneven pattern 6 to be formed can be formed.
When a metal thin film layer is provided as the decorative layer 4, a known metal vapor deposition method such as vacuum vapor deposition, sputtering, or ion plating, or a metal paste containing a metal powder of a metal species that forms the metal thin film layer and a binder resin Can be formed by applying and drying. In the present invention, it is preferably formed by a metal vapor deposition method.
As described above, the embossing is preferably performed on the surface of the peeling layer 3, but may be performed on the surface of the decorative layer 4 after forming the decorative layer 4 as necessary.

<Hydraulic transfer sheet>
The hydraulic transfer sheet of the present invention preferably has a water-soluble film, a primer layer, a decorative layer, and a release layer in this order. The details of the primer layer, the decorative layer, and the release layer are the same as those in the above-described transfer foil for producing a hydraulic transfer sheet.

[Water-soluble film]
The water-soluble film according to the present invention may be any water-soluble or water-swellable film, and can be appropriately selected from water-soluble films conventionally used as a hydraulic transfer film. .
Examples of the resin constituting the water-soluble film include polyvinyl alcohol resin, dextrin, gelatin, glue, casein, shellac, gum arabic, starch, protein, polyacrylamide, sodium polyacrylate, polyvinyl methyl ether, methyl vinyl ether and anhydrous Various water-soluble polymers such as a copolymer with maleic acid, a copolymer of vinyl acetate and itaconic acid, polyvinylpyrrolidone, acetylcellulose, acetylbutylcellulose, carboxymethylcellulose, methylcellulose, hydroxyethylcellulose, sodium alginate and the like can be mentioned. These resins may be used alone or in combination of two or more. In addition, rubber components, such as mannan, xanthan gum, and guar gum, may be added to the water-soluble film.

Among the above water-soluble films, polyvinyl alcohol (PVA) resin films are particularly preferable from the viewpoints of production stability, solubility in water and economy. In addition, the polyvinyl alcohol-type resin film may contain additives, such as starch and rubber | gum, besides PVA.
When a polyvinyl alcohol-based resin film forms a printing layer for transfer on a water-soluble film by changing the polymerization degree of polyvinyl alcohol, the degree of saponification, and the blending amount of additives such as starch and rubber. Adjust the required mechanical strength, moisture resistance during handling, speed of softening by water absorption after floating on the water surface, time required for spreading or spreading in water, ease of deformation in the transfer process, etc. Can do.

A suitable water-soluble film comprising a polyvinyl alcohol-based resin film is the one described in JP-A-54-92406, for example, 80% by mass of PVA resin, 15% by mass of polymer water-soluble resin. %, 5% by mass starch, and about 3% equilibrium water content is preferred.
The polyvinyl alcohol-based resin film is water-soluble, but preferably remains as a film while being swollen and softened in the water before being dissolved in water. This is because, by performing the hydraulic transfer while the film is still alive, it is possible to prevent an excessive flow and deformation of the printing layer for transfer during the hydraulic transfer.

  As thickness of a water-soluble film, 10-100 micrometers is preferable. When it is 10 μm or more, the uniformity of the film is good and the production stability is high. On the other hand, when it is 100 μm or less, the solubility in water is moderate and the printability is excellent. From the above viewpoint, the thickness of the water-soluble film is more preferably in the range of 20 to 60 μm.

  In addition, although said water-soluble film can also be laminated | stacked and used for the base material which has water permeability, such as paper, a nonwoven fabric, cloth, for example, such a water-permeable base material and a water-soluble film, When the water transfer sheet is laminated, the water-permeable substrate is separated from the water-soluble film before the hydraulic transfer sheet floats on the water surface, or the water-permeable film is separated from the water-soluble film by the action of water after floating on the water surface. It is preferable to configure so that the base material having a separation.

[Method for producing hydraulic transfer sheet]
The method for producing a hydraulic transfer sheet of the present invention comprises a step (A) of applying an activator to the primer layer side and / or water-soluble film of the above-described transfer foil for producing a hydraulic transfer sheet, and a transfer foil for producing a hydraulic transfer sheet. It has the process (B) which laminates | stacks a water-soluble film on the primer layer side, and the process (C) which peels a peeling film, It is characterized by the above-mentioned.
The activator in the step (A) is not particularly limited as long as it can activate the primer layer and the water-soluble film, but the water-soluble film can be easily activated by using water.
A process (B) can be laminated | stacked by superposing | stacking and pressurizing a water-soluble film on the primer layer side of the transfer foil for hydraulic transfer sheet manufacture. Specifically, the water-soluble film and the transfer foil for producing a hydraulic transfer sheet can be continuously laminated by being introduced between the two roll cylinders in a state where they are overlapped.
The hydraulic transfer sheet thus obtained may be a hydraulic transfer sheet having the release layer described above, or a release layer omitted therefrom.

<Manufacturing method of decorative molded product>
The method for producing a decorative molded product according to the present invention includes the step (a) of obtaining a hydraulic transfer sheet by the above-described method for producing a hydraulic transfer sheet, and applying an activator to the decorative layer 4 side of the hydraulic transfer sheet. A step (b) for softening, a step (c) for bringing the hydraulic transfer sheet into close contact with the transfer surface of the transferred body, and a removal of the water-soluble film and the primer layer 5 remaining on the transferred surface of the transferred body. The step (a) includes a membrane step (d). Before the hydraulic transfer sheet is floated on the water surface, the decorative layer 4 side of the hydraulic transfer sheet (if the hydraulic transfer sheet has the release layer 3, the release layer 3 side), for example, by applying an activator by a spray coating method, making the activator uniform with a smoothing roll, and dissolving or swelling at least a part of the release layer 3 and the decorative layer 4.
The manufacturing method of the decorative molded product of the present invention may further include a step (e) of forming a protective film on the transferred decorative layer 4 as necessary.
The decorative molded product obtained in this manner has a decorative layer and a primer layer in this order on the transferred body, and even if it has a release layer between the transferred body and the decorative layer. Good.

  Examples of the material to be transferred include polystyrene resin, acrylonitrile-butadiene-styrene copolymer (ABS resin), polycarbonate resin, melamine resin, phenol resin, urea resin, fiber resin, polyethylene resin, polypropylene resin, and the like. In addition to the mixed resin, a structure made of a material such as a metal such as iron, aluminum, or copper, ceramics such as ceramics, glass, or cocoon, or wood can be used. The shape of the transfer surface may be a two-dimensional shape that is a planar shape, or a three-dimensional shape such as an uneven shape or a curved shape. Of these, resin structures are usually used frequently. In this resin structure, a mold release agent adheres at the time of molding, and dust and fat may also adhere. In order to transfer the decorative layer of the hydraulic transfer sheet with good adhesion, a degreasing solution is used in advance. It is preferable to clean the transfer surface.

EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited at all by these examples.
In addition, about the hydraulic transfer sheet obtained in each example, the performance evaluation shown below was performed.
(1) Transfer stability 3 g / m ^{2 of} an activator composition having the following composition is applied to the surface of the metal thin film layer of the obtained hydraulic transfer sheet, and the activator composition is made uniform with a smoothing roll. After passing through the activation process of the metal thin film layer, the transferred object was pressed against the hydraulic transfer sheet, and the metal thin film layer was brought into close contact with the transferred surface of the transferred object by water pressure. The surface state of the decorative molded product was visually observed and evaluated according to the following criteria.
(Composition of activator composition)
Phthalic acid-based alkyd resin 6 parts by weight Microsilica (pigment) 2 parts by weight Dibutyl phthalate 17 parts by weight Solvent (butyl carbitol acetate) 60 parts by weight Solvent (butyl cellosolve) 15 parts by weight (evaluation criteria)
○: The uneven pattern is uniformly transferred, and there is no distortion of the pattern.
X: The transferred concavo-convex pattern had pattern distortion.

(2) Curling resistance The state of the obtained hydraulic transfer sheet was visually confirmed and evaluated according to the following criteria.
○: No curling occurred on the hydraulic transfer sheet.
X: Curling occurred on the hydraulic transfer sheet.

(3) Blocking resistance The obtained hydraulic transfer sheets were overlapped and allowed to stand for 1 hour, then peeled off and evaluated according to the following criteria.
○: Blocking could not be confirmed during peeling.
X: Blocking was confirmed at the time of peeling.

Example 1
Polyvinylpyrrolidone resin was gravure coated at a coating amount of 3 g / m ² on one side of a 18 μm-thick stretched polypropylene film (heat-resistant temperature: 140 ° C.) to provide a release layer having a thickness of 2 μm. Next, using a embossing apparatus, embossing was performed from the surface side of the release layer at a pressure of 100 ton / m ² and a temperature of 130 ° C. to form a concavo-convex pattern having a depth of 60 μm. Next, a vapor-deposited metal layer having a thickness of 350 mm was formed on the concavo-convex pattern of the release layer by a vacuum vapor deposition method. Further, a primer layer having a thickness of 2 μm was provided in the same manner as the release layer. The obtained transfer foil for producing a hydraulic transfer sheet was stored for 1 hour in an environment of an air temperature of 25 ° C. and a relative humidity of 70%, and then a 30 μm-thick PVA film coated with water on the surface was transferred to the hydraulic transfer sheet production The film was superimposed on the primer layer side of the foil and pressed, and the stretched polypropylene film as a release film was peeled off to obtain a hydraulic transfer sheet. The transfer stability, curling resistance and blocking resistance of the obtained hydraulic transfer sheet were evaluated by the above methods. The results are shown in Table 1.

Example 2
In place of the stretched polypropylene film, a 25 μm-thick stretched PET film (heat-resistant temperature: 200 ° C.) was used, and the embossing temperature was set to 190 ° C. A transfer sheet was produced, and its transfer stability, curling resistance and blocking resistance were evaluated. The results are shown in Table 1.

Comparative Example 1
A primer layer is formed on a 30 μm-thick PVA film [heat-resistant temperature: 80 ° C.] in the same manner as in Example 1, then embossed at a temperature of 70 ° C. from the surface side, and further a deposited metal layer is formed. A water pressure transfer sheet was manufactured and stored for 1 hour in an environment at an air temperature of 25 ° C. and a relative humidity of 70%, and then its transfer stability, curling resistance and blocking resistance were evaluated. The results are shown in Table 1.

  As is clear from Table 1, the hydraulic transfer sheets obtained in Examples 1 and 2 are embossed in the absence of a water-soluble film, so that an unnecessary heat history is not applied to the water-soluble film. No distortion occurred during the transfer. On the other hand, in the hydraulic transfer sheet obtained in Comparative Example 1, a heat history was applied to the water-soluble film, and distortion was confirmed during transfer.

  The transfer foil for producing a hydraulic transfer sheet of the present invention can provide a decorative molded product excellent in design. The obtained decorative molded product can be suitably used as an automobile interior material, building material, furniture, a housing for an electric product, or the like.

DESCRIPTION OF SYMBOLS 1 Transfer foil for hydraulic transfer sheet production 2 Peeling film 3 Peeling layer 4 Decorating layer 5 Primer layer 6 Uneven pattern

Claims (6)

A transfer foil for producing a hydraulic transfer sheet, comprising a release film, a decorative layer on which an uneven pattern is formed, and a water-soluble primer layer in this order. The transfer foil for producing a hydraulic transfer sheet according to claim 1, further comprising a release layer between the release film and the decorative layer on which the uneven pattern is formed . Hydraulic transfer sheet for manufacturing a transfer foil according to claim 1 or 2 wherein the water-soluble primer layer comprises a polyvinylpyrrolidone resin. The process of apply | coating an activator to the water-soluble primer layer side of the transfer foil for hydraulic transfer sheet manufacture in any one of Claims 1-3 , and / or a water-soluble film, and the water-soluble primer of the transfer foil for hydraulic transfer sheet manufacture A method for producing a hydraulic transfer sheet, comprising: a step of laminating a water-soluble film on a layer side; and a step of peeling a release film. An activator is applied to the water-soluble primer layer side and / or the water-soluble film of the transfer foil for producing a hydraulic transfer sheet, which has a release film, a decorative layer on which an uneven pattern is formed, and a water-soluble primer layer in this order. a step, a step of obtaining a hydraulic transfer sheet and laminating a water-soluble primer layer side to the water-soluble film of the water pressure transfer sheet for manufacturing a transfer foil, by a step of peeling the release film, the decorative layer of the hydraulic transfer sheet A step of applying and softening an activator on the side, a step of bringing the hydraulic transfer sheet into close contact with the transfer surface of the transfer body, and a water-soluble film and a water-soluble primer layer remaining on the transfer surface of the transfer body A method for producing a decorative molded product, comprising: a film removal step for removing water. A hydraulic transfer sheet comprising a water-soluble film, a water-soluble primer layer, a decorative layer on which an uneven pattern is formed, and a release layer in this order.

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