JP7087562B2 - Hydraulic transfer film and its manufacturing method - Google Patents

Description

The present invention relates to a hydraulic transfer film suitable for forming a transfer layer on the surface of a molded body having a three-dimensional surface or a curved surface, and a method for producing the same.

Molded products with wood grain or metallic luster on the surface are used for automobile interior products, home appliances, OA equipment, and the like. Many of these molded products have a complicated three-dimensional shape, and conventionally, a method of easily applying a highly-designed decoration to a molded product having the complicated shape has been studied.
As such a decoration method, a hydraulic transfer method using hydraulic pressure is known. In this hydraulic transfer method, a transfer film having a desired decorative layer printed on a water-soluble or water-swellable water-soluble film is prepared, and an active agent composition composed of an organic solvent is applied to the decorative layer of the transfer film. The decorative layer is swelled and made sticky (this is called activation). Before or after that, the transfer film is suspended 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 close contact with the surface to be transferred to be decorated, the water-soluble film is removed and the decorative layer is transferred (see, for example, Patent Documents 1 and 2).

In such a hydraulic transfer method, the demands on the design of consumers are increasing in recent years, and a further sense of quality is required. For example, in metallic decoration, a hydraulic transfer film that combines a layer that exhibits brilliance and an embossed uneven shape has been proposed in order to give a high-class feeling in addition to high brilliance (). For example, see Patent Document 3).

Japanese Unexamined Patent Publication No. 61-66685 Japanese Unexamined Patent Publication No. 60-165300 Japanese Unexamined Patent Publication No. 2016-68274

In the general hydraulic transfer method disclosed in Patent Documents 1 and 2, a pattern is printed on the hydraulic transfer film and the pattern is transferred, so that the pattern on the printing film and the pattern on the transferred product are the same. On the other hand, an object of the present application is to provide a hydraulic transfer film that can change the pattern in the process of transfer processing when the pattern of the printing film is transferred to produce a transfer processed product.
In the hydraulic transfer film disclosed in Patent Document 3, the uneven shape formed on the brilliant ink layer at the time of the hydraulic transfer film can be visually recognized as a design, and the uneven shape is transferred to obtain excellent brilliance and luxury. It is intended to impart a design provided with the above to a resin molded product. Therefore, it is not intended to change the pattern between the hydraulic transfer film and the transfer processed product, and the invention idea is completely different from the present invention.

As a result of diligent research to solve the above problems, the present inventor imparts a specific uneven shape to the water-soluble film which is the base material of the hydraulic transfer film, whereby the hydraulic transfer film is subjected to the transfer processing. It was found that it is possible to produce a transfer processed product with high design by changing the pattern of. The present invention has been completed based on such findings.
That is, the present invention
[1] A hydraulic transfer film having a design layer on a water-soluble film and having an uneven shape that does not reach the design layer from the water-soluble film side.
[2] Hydraulic transfer including (A) a step of laminating a design layer on a water-soluble film and (B) a step of imparting an uneven shape that does not reach the design layer from the surface of the water-soluble film opposite to the design layer. A method for producing a film, [3] (B) a step of imparting an uneven shape from one surface of the water-soluble film so as not to affect the smoothness of the other surface, and (A) water solubility. A method for manufacturing a hydraulic transfer film, which comprises a step of laminating a design layer on a surface opposite to a surface having an uneven shape of the film.
Is to provide.

According to the present invention, it is possible to provide a hydraulic transfer film capable of giving a change to the pattern in the hydraulic transfer step, instead of transferring the pattern of the hydraulic transfer film as it is. Further, by using the hydraulic transfer film, it is possible to give an excellent design to the transfer processed product.

It is a schematic sectional drawing which shows an example of the structure of the hydraulic transfer film of this invention. It is the schematic sectional drawing which shows another example of the structure of the hydraulic transfer film of this invention.

Hereinafter, the hydraulic transfer film of the present invention will be described.
[Hydraulic transfer film]
FIG. 1 is a schematic cross-sectional view showing an example of the configuration of the hydraulic transfer film of the present invention.
The hydraulic transfer film 10 of the present invention has a design layer 12 on the water-soluble film 11. The water-soluble film 11 has an uneven shape 13 that does not reach the design layer on the opposite side (lower side in FIG. 1) of the design layer 12.
It is a feature of the present invention that a thick portion and a thin portion are formed in the water-soluble film by imparting the uneven shape 13 to the water-soluble film 11. Compared to the thick part of the film, the water-soluble film dissolves in a short time when it is floated on water, so that the hydraulic transfer film is easily stretched. Therefore, the color of the portion concerned may be lightened or the pattern may be stretched.
On the other hand, in the thick portion of the water-soluble film (corresponding to the convex portion of the uneven shape), the pattern of the design layer 12 is transferred in the same color and shape as in the conventional hydraulic transfer film.
Therefore, the pattern of the hydraulic transfer film of the present invention changes at the time of transfer according to the uneven shape provided on the hydraulic transfer film, and the pattern changed with respect to the pattern on the hydraulic transfer film is transferred to the transferred body. Transferred.

The thickness of the water-soluble film in the concave-convex shape is preferably 80% to 30% with respect to the thickness of the convex portion of the water-soluble film. When it is 80% or less, a change in the pattern is sufficiently observed, and a suitable design can be imparted to the transfer processed product. On the other hand, when it is 30% or more, the water-soluble film is suitable because the film shape can be sufficiently maintained at the time of transfer processing and tearing or the like does not occur. From the above viewpoint, the thickness of the water-soluble film in the concave portion is preferably 60 to 35%, more preferably 55 to 40% with respect to the thickness of the convex portion of the water-soluble film.
Here, the thickness of the convex portion of the water-soluble film is originally equal to the thickness of the water-soluble film.

In the present invention, since the opposite side of the design layer 12 is processed, it can be applied regardless of the pattern and layer structure of the design layer 12, and can be processed by a conventional method. Further, by imparting various uneven shapes, various patterns can be transferred.
The method for forming the unevenness is not particularly limited as long as it does not impair the smoothness of the design layer, and there are various methods, but scribe processing is preferable. This is because the scribing process can scrape only the surface of the water-soluble film, and can easily shape the uneven shape without impairing the smoothness of the design layer.
Here, "scribing" usually refers to the work of drawing a line or a hole position as a processing reference, but in the present invention, a hard needle-shaped rod having a bent tip with respect to a water-soluble film. The surface of the water-soluble film is scratched with a (scriber) or the like and scraped to draw a line to form a concave portion.

Embossing is known as a method for forming unevenness, and in the above-mentioned Patent Document 3, embossing is used. The hydraulic transfer film disclosed in Patent Document 3 is embossed from the opposite side of the design layer of the water-soluble film to form irregularities leading to the design layer. By doing so, unevenness is formed on the design layer itself to express a three-dimensional design.
However, in the embossing process as disclosed in Patent Document 3, since the hydraulic transfer film is heated and the embossed plate is used to form an uneven shape, there is a concern that the film shrinks due to heat and the ink is peeled off. Further, in the case of a pattern using a bright pigment, fine cracks may occur in the vapor-filmed metal layer due to the stretching of the film during hydraulic transfer. Depending on the width of the crack, the high-quality appearance of the pattern is impaired. Therefore, in the hydraulic transfer film of Patent Document 3, in order to maintain the embossed design even after the transfer, a stretch-suppressing resin layer is provided between the water-soluble film and the design layer. It is provided.
That is, the hydraulic transfer film disclosed in Patent Document 3 suppresses the elongation of the water-soluble film in order to maintain the embossed design reaching the design layer, whereas the hydraulic transfer film of the present invention is used. Is to intentionally create different parts of the stretch of the water-soluble film and bring about a change in the design, and the idea of invention is completely different.
In the hydraulic transfer film disclosed in Patent Document 3, the stretch-suppressing resin layer may reduce workability, whereas in the present invention, good workability can be obtained.

The hydraulic transfer film of the present invention forms an uneven shape from the water-soluble film side, but it is important that the uneven shape does not reach the design layer. As a result, the surface of the design layer 12 (on the upper surface side in FIG. 1) maintains smoothness. Regarding the smoothness, it is preferable that the arithmetic mean roughness Ra at a cutoff value of 0.8 mm measured according to JIS B0601: 1994 is 1.0 μm or less. The lower limit value is preferably as smooth as possible, and is not particularly limited, but is usually 0.001 μm from the viewpoint of manufacturing. A more preferable range of Ra is 0.01 to 0.5 μm, and a more preferable range is 0.1 to 0.3 μm.
In the present invention, as described above, since the uneven shape does not reach the design layer, the original smoothness of the design layer is maintained, but in order to further improve the smoothness, the above-mentioned scribe processing or the like is performed. It is preferable to use a method such as pressing a flat plate from the design layer side.
On the other hand, the arithmetic mean roughness Ra of the water-soluble film on the side to which the uneven shape is imparted is preferably 1.2 to 7.5 μm, more preferably 1.8 to 4.5 μm, and 2.3. It is particularly preferably about 2.9 μm. The measurement conditions for Ra are the same as described above.

<Water-soluble film>
The water-soluble film 11 in the present invention may be any water-soluble or water-swellable film, and can be appropriately selected and used from the water-soluble films generally used in conventional hydraulic transfer films.
Examples of the resin constituting the water-soluble film 11 include polyvinyl alcohol resin, dextrin, gelatin, sardine, casein, cellac, gum arabic, starch, protein, polyacrylic acid amide, sodium polyacrylate, polyvinyl methyl ether, and methyl vinyl ether. Examples thereof include a copolymer with maleic anhydride, a copolymer of vinyl acetate and itaconic acid, and various water-soluble polymers such as polyvinylpyrrolidone, acetyl cellulose, acetyl butyl cellulose, carboxymethyl cellulose, methyl cellulose, hydroxyethyl cellulose, and sodium alginate. These resins may be used alone or in combination of two or more. A rubber component such as mannan, xanthan gum, or guar gum may be added to the water-soluble film.

Among the above water-soluble films, polyvinyl alcohol (PVA) -based resin films are particularly preferable from the viewpoints of production stability, solubility in water, and economy. The polyvinyl alcohol-based resin film may contain additives such as starch and rubber in addition to PVA.
The polyvinyl alcohol-based resin film is used when forming a design layer for transfer with respect to a water-soluble film by changing the degree of polymerization and saponification of polyvinyl alcohol, the blending amount of additives such as starch and rubber, and the like. Appropriately adjust the required mechanical strength, moisture resistance during handling, the rate of softening by water absorption after floating on the water surface, the time required for spreading or diffusion in water, the ease of deformation in the transfer process, etc. Can be done.

Suitable as a water-soluble film made of a polyvinyl alcohol-based resin film is as described in Japanese Patent Application Laid-Open No. 54-92406, for example, 80% by mass of PVA resin and 15% by mass of polymer water-soluble resin. % And 5% by mass of starch, and the one having an equilibrium water content of about 3% is preferable.
Although the polyvinyl alcohol-based resin film is water-soluble, it is preferable that the polyvinyl alcohol-based resin film remains as a film while swelling and softening in water before it is dissolved in water. This is because by performing hydraulic transfer while the film is still in existence, it is possible to prevent excessive flow and deformation in each layer for transfer during hydraulic transfer.

The thickness of the water-soluble film is preferably 10 to 100 μm. 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 appropriate and the printability is excellent. From the above viewpoint, the thickness of the water-soluble film is more preferably in the range of 30 to 50 μm.

The above water-soluble film can be used by laminating it with a water-permeable base material such as paper, non-woven fabric, or cloth, but it is water-soluble or water-soluble with such a water-permeable base material. When laminated with a swellable water-soluble film, the water-permeable substrate may be separated from the water-soluble or water-swellable water-soluble film or placed on the water surface before the hydraulic transfer film is floated on the water surface. It is preferable to configure the substrate so that the water-permeable substrate is separated from the water-soluble or water-swellable water-soluble film by the action of water after floating.

<Design layer>
The design layer 12 is a layer that is transferred to a transfer processed product to impart a design. The design layer 12 has a pattern layer 14. Further, the design layer 12 may have a protective layer 16 in addition to the pattern layer 14. As a layer structure, as shown in FIG. 2, a layer having a primer layer 15, a pattern layer 14, and a protective layer 16 as needed from the water-soluble film 11 side in this order can be mentioned. The pattern layer may be a pattern or a solid printing layer.
The pattern layer 14 usually contains a binder resin and a colorant. Examples of the binder resin include thermoplastic resins, and specific examples thereof include acrylic resins, polyester resins such as alkyd, unsaturated polyester resins, urethane resins (for example, polyester urethane resins), polycarbonate resins, and vinyl chloride-vinyl acetate. Examples thereof include, but are not limited to, polymers, polyvinyl acetal (butyral resin) such as polyvinyl butyral, and nitrocellulose resin such as vitrified cotton.
The binder resin may be used alone or in combination of two or more.

Coloring agents include carbon black (black), iron black, titanium white, antimony white, yellow lead, titanium yellow, petals, cadmium red, ultramarine, cobalt blue and other inorganic pigments, quinacridone red, isoindolinone yellow, phthalocyanine. Organic pigments or dyes such as blue, metal pigments made of scaly foil pieces such as aluminum and brass, titanium dioxide-coated mica, and pearl gloss pigments made of scaly foil pieces such as basic lead carbonate are used.
In the present invention, the effect is remarkable when a bright pigment, that is, a metal pigment made of scaly foil pieces such as aluminum and brass described above is used as the colorant. That is, in the present invention, it is a preferable aspect from the viewpoint of the effect that the design layer contains a bright pigment and a binder resin.

<Primer layer>
The hydraulic transfer film 10 of the present invention may have a primer layer 15 between the water-soluble film 11 and the design layer 12, as shown in FIG. 2, as long as the effect of the present invention is exhibited. The primer layer 15 is a layer located on the outermost surface of the transferred body when the top coat layer described later is not formed on the transferred surface of the transferred body. On the other hand, in the embodiment in which the top coat layer is provided as described later, the primer layer 15 is located between the top coat layer and the pattern layer 14 to protect the pattern layer 14 from the solvent contained in the paint forming the top coat layer. ..
The thickness of the primer layer is usually about 0.1 to 10 μm, preferably 0.5 to 2 μm.

<Protective layer>
The protective layer 16 in the hydraulic transfer film of the present invention is a layer provided as needed, and is preferably composed of a resin composition containing an acrylic polymer polyol and / or a cured product thereof. The resin composition and / or a cured product thereof has a function of protecting the pattern layer from attack by the solvent contained in the activator composition.
As the acrylic polymer polyol, one having a weight average molecular weight of 1,000 to 100,000 and a hydroxyl value of 30 to 130 mgKOH / g, which is determined by a gel permeation chromatography (GPC) method and converted into standard polystyrene, is used. ..
The thickness of the protective layer is usually about 0.1 to 25 μm, preferably 0.5 to 10 μm.

[Manufacturing method of hydraulic transfer film]
In the method for producing a hydraulic transfer film of the present application, (A) a step of laminating a design layer on a water-soluble film, and (B) an uneven shape that does not reach the design layer from a surface opposite to the design layer of the water-soluble film. Has a step of imparting.
The step (A) of laminating the design layer can be formed by a known coating method or printing method, and a resin film for forming the design layer is prepared and formed by laminating the resin film. be able to. Examples of the coating method include gravure coating and reverse coating, and examples of the printing method include gravure printing.

In the step (B) of imparting an uneven shape that does not reach the design layer from the surface opposite to the design layer of the water-soluble film, any method can be used as long as the uneven shape does not reach the design layer. More specifically, scribe processing can be mentioned as a preferred embodiment.
As described above, the "scoring process" in the present invention is to scratch the surface of the water-soluble film with a scriber or the like and scrape it in a line to form a recess. be. According to the scribe processing, it is possible to scrape only the surface of the water-soluble film, and it is possible to easily form an uneven shape that does not reach the design layer.

For the marking process, for example, a method of scraping the surface of the water-soluble film with a marking needle while unwinding and winding the hydraulic transfer film with a roll-to-roll method is preferable because of its high productivity. Further, at that time, by scraping while moving the marking needle to the left and right, it is possible to form an uneven shape from parallel to a certain angle with respect to the machine direction (MD; Machine Direction) of the film. In addition, in the case of processing with a single leaf, it is possible to add an uneven shape in all directions.
In the present invention, it is preferable that the design layer of the hydraulic transfer film is smooth. Therefore, it is preferable to apply the design layer side to the flat plate and perform the marking process in a state where pressure is applied.

Further, the hydraulic transfer film of the present invention can be produced by changing the order of the above-mentioned steps (A) and (B). More specifically, (B) a step of imparting an uneven shape from one surface of the water-soluble film so as not to affect the smoothness of the other surface, and (A) unevenness of the water-soluble film. It is a method for producing a hydraulic transfer film, which comprises a step of laminating a design layer on a surface opposite to a surface to which a shape is imparted.
In the manufacturing method as well, any method may be used as the step (B) as long as it does not affect the smoothness of the other surface, but for the same reason as described above, scribe processing is preferable and the other. It can be easily achieved to give an uneven shape so as not to affect the smoothness of the surface of the surface.
Further, in order to further ensure the smoothness of the other surface, it is preferable to perform scribe processing with the other surface placed on a flat plate.

In the step (B) of imparting an uneven shape such as scribing, the thickness of the water-soluble film in the concave portion of the uneven shape is 80% to 30% of the thickness of the water-soluble film in the convex portion. It is preferable to process it.

The method for producing a hydraulic transfer film of the present invention may further include (C) a step of providing a primer layer between the water-soluble film and the design layer in addition to the steps (A) and (B). The order of the steps is the order of (C) step, (A) step, (B) step, or the order of (B) step, (C) step, (A) step.
As the step (C) for providing the primer layer, the same method as the method of the step (A) can be used. That is, it is a known coating method or printing method, and a method of preparing a resin film for forming a primer layer and laminating it. Alternatively, a method may be used in which a resin film in which the pattern layer 14 and the primer layer 15 are laminated is prepared in advance, and the resin film is laminated so that the primer layer is in contact with the water-soluble film 11.

[Manufacturing method of decorative molded products]
Using the hydraulic transfer film of the present invention, a decorative molded product can be produced by the following steps (a) to (d).
Step (a): A step of suspending the hydraulic transfer film 10 on the water surface so that the water-soluble film 11 side faces the water surface side.
Step (b): A step of applying the activator composition to the design layer 12 side of the hydraulic transfer film 10.
Step (c): A step of pressing the transferred body onto the hydraulic transfer film 10 that has undergone the steps (a) and (b), and bringing the design layer 12 into close contact with the transferred surface of the transferred body by hydraulic pressure.
Step (d): A film removing step of removing the water-soluble film 11 from the surface to be transferred of the transferred body.
Further, the following step (e) may be provided following the above step (d).
Step (e): A step of forming a top coat layer on the transfer surface of the transfer target.

<Step (a)>
Step (a) can be performed before or after step (b). The hydraulic transfer film 10 is suspended on the water surface so that the water-soluble film 11 side faces the water surface side. In order to suspend the hydraulic transfer film 10 on the water surface, the sheet-fed printed matter may be suspended one by one, or water is allowed to flow in one direction, and a continuous band-shaped hydraulic transfer film 10 is continuously formed on the water surface. It may be supplied and floated.

<Step (b)>
The step (b) can be performed before or after the step (a), and is a step of applying the activator composition to the design layer 12. By applying the activator composition in this step, at least a part of the design layer 12 is dissolved or swollen to soften (activate), and it becomes easy to adhere to the transferred body.

(Activator composition)
The activator composition is not particularly limited as long as it is a composition having a function of activating the design layer 12 and transferring it to the transferred surface of the transferred body, and each layer is transferred to the transferred surface of the transferred body. It is preferable that it has a property that it does not evaporate until it is allowed to evaporate. Preferred examples of such an activator composition include compositions containing esters, acetylene glycols, ethers, and resins.
Preferred examples of the esters include ethyl acetate, propyl acetate, butyl acetate, isobutyl acetate, sec-butyl acetate, tert-butyl acetate, dibutyl oxalate, dibutyl phthalate, dimethyl phthalate, dioctyl phthalate, and diisooctyl phthalate. Be done.
Preferred examples of acetylene glycols include methoxybutyl acetate, ethoxybutyl acetate, ethyl carbitol acetate, propyl carbitol acetate, and butyl carbitol acetate.
Preferred examples of ethers include methyl cellosolve, butyl cellosolve, and isoamyl cellosolve.
As the resin, a thermoplastic resin such as an acrylate-based monomer alone or a copolymer, a polyamide resin, a polyester resin, a phenol resin, a melamine resin, a urea resin, an epoxy resin, an alkyd phthalate resin, and a diallyl phthalate can be used. Thermally curable resins such as resins, alkyd resins, and polyurethane resins are preferred, with thermocurable resins being preferred.
The content of each preferable composition of the activator composition used in the present invention is 5 to 40% by mass for esters, 40 to 80% by mass for acetylene glycols, 5 to 30% by mass for ethers, and 1 for resins. It is about 20% by mass.

The activator composition may be applied by gravure printing, a spray coating method, or the like, and the amount of the activator composition is usually 1 to 50 g / m ² , preferably 3 to 30 g / m ² , and more preferably 10 to 10. It is 20 g / m ² .

<Step (c)>
The step (c) is a step of pressing the transferred body onto the hydraulic transfer film 10 that has undergone the steps (a) and (b), and bringing the design layer 12 into close contact with the transferred surface of the transferred body by hydraulic pressure. When the primer layer 16 is included in addition to the design layer 12, the primer layer 16 is also transferred at the same time.
The water for floating the hydraulic transfer film 10 and applying the hydraulic pressure is preferably adjusted to an appropriate water temperature according to the type of the water-soluble film 11 of the hydraulic transfer film 10, preferably about 25 to 50 ° C., and more. It is preferably 25 to 35 ° C.
The transfer time between the hydraulic transfer film 10 of the present invention and the transferred body is preferably about 20 to 120 seconds, more preferably about 30 to 60 seconds.

(Transfered body)
Examples of the transferred material include polystyrene resin, acrylonitrile-butadiene-styrene copolymer (ABS resin), polycarbonate resin, melamine resin, phenol resin, urea resin, fiber resin, polyethylene, olefin resin such as polypropylene, or these. In addition to the resin mixed with the above, a structure made of metal such as iron, aluminum and copper, ceramics such as ceramics, glass and amber, and materials such as wood can be used.
Further, the shape of the surface to be transferred may be a two-dimensional shape which is a planar shape, or a three-dimensional shape such as an uneven shape or a curved surface shape. Of these, resin structures are usually often used. This resin structure has a mold release agent attached to it during molding, and dust and oils may also adhere to it. In order to transfer each layer of the hydraulic transfer film with good adhesion, it is transferred in advance with a degreasing solution. It is preferable to keep the surface clean.

In the step (c), the activator composition applied to the design layer 12 side is in contact with the transferred body, and the surface of the transferred body is dissolved to bring the hydraulic transfer film 10 of the present invention into close contact with the transferred body. The sex can be further improved.

<Membrane removal step (d)>
The film removal step (d) is performed after the step (c) and is a step of removing the water-soluble film 11 from the surface to be transferred of the transferred body.
The water-soluble film 11 adhering to the surface to be transferred can be removed by, for example, shower washing with water. The conditions for shower cleaning vary depending on the material forming the water-soluble film 11, but usually the water temperature is preferably about 15 to 60 ° C. and the washing time is preferably about 10 seconds to 5 minutes.

<Step (e)>
The step (e) is a step of forming a top coat layer on the surface to be transferred of the transferred body, if necessary.
In the step (e), the design layer transferred to the surface to be transferred in the step (d) is coated as necessary for improving the surface strength, protecting the surface, adjusting the surface gloss, and the like. Apply to form a transparent or translucent topcoat layer. Examples of the material forming the top coat layer include a thermoplastic resin, a thermosetting resin, an ionizing radiation curable resin (ultraviolet curable resin, an electron beam curable resin), and specifically, a urethane resin and an epoxy resin. , Acrylic resin, fluororesin, silicon resin and the like are used. The top coat layer can be formed by a known coating method such as spray coating, electrostatic coating, brush coating, dip coating, etc., using a coating material obtained by dissolving the above resin in a known organic solvent. The thickness of the top coat layer is not particularly limited, but is preferably 1 to 25 μm, and more preferably 1 to 10 μm.

Next, the present invention will be described in more detail by way of examples, but the present invention is not limited to these examples.
(Evaluation of design)
The design of the transfer surface of the decorative molded product using the hydraulic transfer film obtained in each example was evaluated by visual observation. In addition, using a hydraulic transfer film having no uneven shape, the evaluation was made while comparing with the design of the produced transfer processed product (Reference Example 1).

Example 1
(Manufacturing of hydraulic transfer film)
A PVA film (thickness 40 μm) was used as the water-soluble film, and a colorant composition was applied to one side thereof to prepare a design layer (picture layer, solid printing layer) having a thickness of 1 μm. The colorant composition constituting the design layer contains 35 parts by mass of a bright pigment made of aluminum powder having an average particle size of 11 μm with respect to 100 parts by mass of a binder made of a mixture of vitrified cotton and alkyd (DIC graphic). "GT Color SM Silver)") manufactured by Su Co., Ltd. was used.
Next, the opposite side of the design layer of the water-soluble film was randomly scribed with a scriber. The Ra of the scribed surface was measured to be 2.8 μm, and the Ra of the surface of the design layer was measured to be 0.1 μm.
The thickness of the water-soluble film of the concave-convex concave portion was 16.1 μm, which was 40% of the convex portion (thickness of the water-soluble film 40 μm).

(Manufacturing of decorative molded products)
10 g / m ² of the activator composition having the following composition is applied to the surface of the design layer of the hydraulic transfer film obtained as described above, suspended on the water surface so that the water-soluble film side faces the water surface side, and then hydraulically transferred. A defilming step of removing the water-soluble film from the transferred surface of the transferred body through a transfer step of pressing the transferred object onto the film and bringing the design layer into close contact with the transferred surface of the transferred body by water pressure. gone. Further, a two-component curable urethane resin was spray-coated on the surface to be transferred to form a top coat layer having a thickness of 10 μm.
The design of the obtained decorative molded product was evaluated by the above method. The design of the decorative molded product was an excellent design with shades in addition to brilliance, and it was possible to make changes to the design of the hydraulic transfer film.
(Composition of activator composition)
Phthalic acid-based alkyd resin 6 parts by mass Micro silica (pigment) 2 parts by mass Dibutyl phthalate 17 parts by mass Solvent (butyl carbitol acetate) 60 parts by mass Solvent (butyl cellosolve) 15 parts by mass

Example 2
One surface of a water-soluble film similar to that used in Example 1 was randomly scribed with a scriber. The Ra of the scribed surface was 2.4 μm. The thickness of the water-soluble film in the concave portion was 17.2 μm, which was 43% of the convex portion (thickness of the water-soluble film of 40 μm).
Next, a design layer was provided on the opposite side of the scribed surface in the same manner as in Example 1. Ra on the surface of the design layer was 0.1 μm.
A decorative molded product was produced in the same manner as in Example 1 and evaluated by the same method.
The design of the obtained decorative molded product was an excellent design with shades in addition to brilliance, and it was possible to make changes to the design of the hydraulic transfer film.

Reference example 1
A hydraulic transfer film was obtained in the same manner as in Example 1 except that no scribing was performed in Example 1. When the decorative molded product was produced in the same manner as in Example 1, a design having excellent brilliance was obtained by transferring the design of the hydraulic transfer film as it was.

Reference example 2
A hydraulic transfer film was obtained in the same manner as in Example 1 except that embossing was performed instead of scribing. The embossing was performed from the water-soluble film side to the design layer. The embossing conditions were a temperature of 150 ° C., a pressure of 40 ton / m ² , and a pressing time of 5 hours. The Ra of the water-soluble film and the Ra of the design layer were 8.0 μm and 1.9 μm, respectively.
When the decorative molded product was manufactured in the same manner as in Example 1, the unevenness corresponding to the uneven shape of the design layer was maintained, and a design having excellent brilliance was obtained.

As described above, the hydraulic transfer films obtained in Examples 1 and 2 can impart an excellent design having shading in addition to brilliance to the transferred body, and can be applied to the design of the hydraulic transfer film. I was able to make changes.
In addition to this effect, the following effects were also observed. That is, since the design layer is smooth, the activator is uniformly applied without accumulation, and the design after hydraulic transfer processing is stable.
On the other hand, the hydraulic transfer film of Reference Example 2 is a conventional hydraulic transfer film embossed, but since the activator dissolves the ink of the design layer, the uneven shape tends to disappear with time. .. In the hydraulic transfer film of the present invention, the thickness of the water-soluble film is changed, and the design layer has no uneven shape and is smooth, so that a good design can be transferred even if the swelling time until processing is long. I was able to.

The hydraulic transfer film of the present invention can provide a decorative molded product having high brightness and excellent design. The obtained decorative molded product can be suitably used as an automobile interior material, a building material, furniture, a housing of an electric product, or the like.

10 Hydraulic transfer film 11 Water-soluble film 12 Design layer 13 Concavo-convex shape 14 Picture layer 15 Primer layer 16 Protective layer

Claims (11)

A hydraulic transfer film having a design layer on a water-soluble film, which has an uneven shape that does not reach the design layer from the water-soluble film side.
A hydraulic transfer film in which the thickness of the water-soluble film in the concave-convex-shaped concave portion is 80% to 30% with respect to the thickness of the convex portion of the water-soluble film. The hydraulic transfer film according to claim 1, wherein the surface of the design layer is smooth. The hydraulic transfer film according to claim 1 or 2, wherein the arithmetic mean roughness Ra at a cutoff value of 0.8 mm measured according to JIS B0601: 1994 on the surface of the design layer is 1.0 μm or less. The hydraulic transfer film according to any one of claims 1 to 3 , wherein the design layer contains a bright pigment and a binder resin. The hydraulic transfer film according to any one of claims 1 to 4, wherein the water-soluble film and the design layer are in contact with each other. The hydraulic transfer film according to any one of claims 1 to 5 , further comprising a primer layer between the water-soluble film and the design layer. It has (A) a step of laminating a design layer on a water-soluble film, and (B) a step of imparting an uneven shape that does not reach the design layer from the surface of the water-soluble film opposite to the design layer .
A method for producing a hydraulic transfer film, wherein the thickness of the water-soluble film in the concave portion of the concave-convex shape is 80% to 30% with respect to the thickness of the water-soluble film in the convex portion . The method for producing a hydraulic transfer film according to claim 7 , wherein the smoothness of the surface of the design layer is not impaired in the step (B). (B) A step of imparting an uneven shape from one surface of the water-soluble film so as not to affect the smoothness of the other surface, and (A) a surface imparted with the uneven shape of the water-soluble film. It has a process of laminating a design layer on the opposite surface ,
A method for producing a hydraulic transfer film, wherein the thickness of the water-soluble film in the concave portion of the concave-convex shape is 80% to 30% with respect to the thickness of the water-soluble film in the convex portion . The method for producing a hydraulic transfer film according to any one of claims 7 to 9 , wherein the step (B) is by scribe processing. (C) The method for producing a hydraulic transfer film according to any one of claims 7 to 10 , further comprising a step of providing a primer layer between the water-soluble film and the design layer.

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