JP2013193298A - Transfer foil and decorative molded object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide transfer foil which can impart pearl design having three-dimensional feeling to a decorative molded object.SOLUTION: Transfer foil 7 has such a constitution that a pearly layer 9 containing a sheeny material is formed immediately above an uneven surface formed layer 8 of an uneven shape. Therefore, the sheeny material sunk into the pearly layer is arranged in a three-dimensional fashion according to the uneven shape of the uneven surface formed layer. As the sheeny material is arranged in three-dimensional solid state, the decorative molded object using the transfer foil displays pearl design revealing a solid sensation on the surface.

Description

  The present invention relates to a transfer foil used for surface decoration of an article, and a decorative molded product decorated with the transfer foil.

  Conventionally, the surface of an article is decorated using a transfer foil. Surface decoration using a transfer foil is used in various applications that require a highly attractive design. For example, (1) equipment main bodies such as daily necessities and daily necessities, (2) containers for foods and various articles, (3) housings such as electronic equipment and office supplies, and the like.

  For example, molding to produce a decorative molded product with integrated transfer foil by placing the transfer foil in an injection mold and closing the mold, injecting molten resin into the mold and injection molding A simultaneous decorating method (in-mold molding) has been proposed (see Patent Document 1).

  On the other hand, a pearl design is known as a surface decoration. As a method for providing a pearl design, it is known to use a transfer foil in which a layer is formed using an ink containing a glittering material. In general, the glittering material has a true specific gravity larger than that of the ink, and is likely to sink in the layer during ink coating. For this reason, the glittering material is arranged in a two-dimensional plane, and when viewed from the surface side of the decorative molded product with surface decoration, the expression is poor in stereoscopic effect. Therefore, it has been required to provide a pearl design with a three-dimensional feeling.

  For example, in order to provide a decorative molded article having a three-dimensional pearl design, two layers of a surface layer-side pearl layer and a lower layer pearl layer are formed, and the glittering material used for the surface layer pearl layer and the lower layer pearl layer is It has been proposed that the particle sizes are different from each other (see Patent Document 2). In addition, according to the method disclosed in Patent Document 2, it is necessary to visually recognize the lower pearl layer through the surface pearl layer. For this reason, it is necessary to give transparency to the surface side pearl layer, and the glittering material to be used and the feasible design are limited.

Japanese Patent Laid-Open No. 10-71680 Japanese Utility Model Publication No. 5-80793

  Then, this invention is made | formed in order to solve the above-mentioned subject, and it aims at providing the transfer foil which can provide the pearl design with a three-dimensional effect to a decorative molded product.

  One embodiment of the present invention is a substrate film, a release layer laminated on the substrate film, a surface protective layer laminated on the release layer, and laminated on the surface protective layer. It is provided with a concavo-convex forming layer, a pearl layer laminated on the concavo-convex forming layer, and an adhesive layer laminated on the pearl layer, wherein the pearl layer contains at least a glittering material. Transfer foil.

  The glitter pigment may be a glitter material having a bulk specific gravity of 0.7 to 1.8.

  In addition, the first concavo-convex forming layer may be formed by printing.

  Moreover, the said uneven | corrugated formation layer may be formed by printing in multiple times using the printing plate from which the number of printing lines differs.

  The unevenness of the unevenness forming layer may be formed by a hot embossing method.

  One embodiment of the present invention is a decorative molded product whose surface is decorated with the transfer foil described above.

  The transfer foil of the present invention has a configuration in which a pearl layer containing a glittering material is formed immediately above a concavo-convex forming layer having a concavo-convex shape. For this reason, the glittering material submerged in the pearl layer is arranged in a three-dimensional shape according to the concavo-convex shape of the concavo-convex forming layer. Since the glittering material is arranged in a three-dimensional shape, the decorative molded product using the transfer foil of the present invention can have a pearl design having a three-dimensional effect on the surface.

It is a schematic sectional drawing which shows an example of the transfer foil of this invention.

  Hereinafter, the transfer foil of the present invention will be described.

(Base film)
A base film is a site | part used as the base | substrate of transfer foil.

  The base film may be used by appropriately selecting a material from flexible materials. For example, (1) Polyester resin such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, (2) Polyolefin resin such as polyethylene, polypropylene, polybutene, polymethylpentene, ethylene-propylene-butene copolymer, (3) Nylon 6, polyamide resin such as nylon 66, (4) polyvinyl chloride, and the like may be used. In particular, a uniaxial or biaxially stretched polyester film is excellent in heat resistance and can prevent the transfer foil from being damaged at the temperature of the resin injected during in-mold molding. Therefore, the base material used in the transfer foil of the present invention Preferred as a film. The base film may be a multilayer composite film in which two or more kinds of films are bonded together.

  Further, the thickness of the base film is preferably in the range of about 5 μm to 200 μm, and more preferably in the range of about 25 μm to 100 μm. The base film having a thickness within the above range is a thickness that can be suitably handled in various printing methods (for example, gravure printing, offset printing, screen printing, flexographic printing, etc.), and can efficiently produce a transfer foil. I can do it. However, the thickness of the base film in the transfer foil of the present invention is not limited to the above range.

(Release layer)
The release layer is formed on the base film. After the transfer foil is integrated with the target article, the base film and the release layer are peeled off at the part of the release layer, so that the outermost surface of the obtained decorative molded product can be a surface protective layer described later. I can do it.

  The material for the release layer may be appropriately selected from materials known as release resins. For example, a melamine resin, an acrylic resin, a polyester resin, a urethane resin, a fluorine resin, a silicone resin, an epoxy resin, or the like may be used. Moreover, the material of the release layer may be a resin mixture obtained by mixing a plurality of resins. In particular, an acrylic resin made by melamine or isocyanate curing is excellent in heat resistance and can prevent the transfer foil from being damaged at the temperature of the resin injected during in-mold molding. Therefore, it is used for the transfer foil of the present invention. Preferred as a material for the release layer.

  In addition, the release layer is formed by adjusting a release layer coating liquid obtained by dispersing and dissolving the release layer material in a solvent, and applying the release layer coating liquid appropriately using a known coating formation method. It may be done by drying. At this time, as a coating formation method, for example, roll coating, reverse roll coating, gravure coating, reverse gravure coating, bar coating, rod coating, kiss coating, knife coating, die coating, comma coating, flow coating, spray coating, etc. A coating method may be used.

  Moreover, it is preferable that the thickness of a mold release layer exists in the range of about 0.01 micrometer or more and 5.0 micrometers or less. A release layer having a thickness within the above range can form a uniform film by various general coating forming methods. However, the thickness of the release layer in the transfer foil of the present invention is not limited to the above range.

(Surface protective layer)
The surface protective layer is formed on the release layer. The surface protective layer becomes the outermost surface of the decorative molded product obtained after integrating the transfer foil with the target article.

  The material for the surface protective layer may be appropriately selected from known materials in consideration of various physical properties such as weather resistance, abrasion resistance, scratch resistance, and chemical resistance. For example, urethane resin, acrylic resin, polyester resin, or the like may be used.

  In addition, the surface protective layer is formed by adjusting a surface protective layer coating liquid in which the material of the surface protective layer is dispersed and dissolved in a solvent, and applying the surface protective layer coating liquid appropriately using a known coating formation method, It may be done by drying. At this time, as a coating formation method, for example, roll coating, reverse roll coating, gravure coating, reverse gravure coating, bar coating, rod coating, kiss coating, knife coating, die coating, comma coating, flow coating, spray coating, etc. A coating method may be used.

  The thickness of the surface protective layer is preferably in the range of 3 μm or more and 15 μm or less. However, the thickness of the surface protective layer in the transfer foil of the present invention is not limited to the above range.

  Moreover, it is preferable to use an active energy ray-curable resin as a material for the surface protective layer. The active energy ray-curable resin is a resin that is cured by irradiating an active energy ray to crosslink functional groups in the resin. For example, examples of the active energy ray-curable resin include a resin containing at least an acryloyl group or a methacryloyl group. When an active energy ray-curable resin is used as the material for the surface protective layer, (1) while maintaining the thermoplasticity in the surface protective layer by irradiating the active foil after integrating the transfer foil with the target article Transfer can be performed while following the surface shape of the target article, and (2) the surface strength of the outermost surface portion of the decorative molded product can be improved by crosslinking and curing after the transfer foil is formed. For this reason, moldability and sufficient hardness (hard coat property) can be made compatible by using an active energy ray hardening-type resin as a material of a surface protective layer.

  Further, when an active energy ray-curable resin is used as the material for the surface protective layer, after the surface protective layer is applied and formed, (1) irradiation with active energy rays not to be completely crosslinked, (2) heating, etc. The surface protective layer may be incompletely (partially) crosslinked. By making the surface protective layer incompletely (partially) crosslinked, (1) it can be dried more completely than in the uncrosslinked state, and handling of the transfer foil is improved. (2) There are effects that the surface protective layer can be prevented from flowing due to heat and stress during transfer.

(Unevenness forming layer)
The unevenness forming layer is formed on the surface protective layer. The unevenness forming layer has an uneven shape at the layer interface.

  As the material of the unevenness forming layer, (1) processability of the uneven shape, (2) the transfer foil is integrated with the target article, and then the pearl layer is visually recognized through the unevenness forming layer. In consideration of light properties and the like, a known material may be appropriately selected and used. For example, a transparent ink, an anchor agent, a thermosetting resin (two-component reactive urethane resin, vinyl chloride / vinyl acetate copolymer resin, etc.), a cellulose derivative, or the like may be used.

  The unevenness forming layer may be formed by printing. Uneven shape can be formed by the presence or absence of the printing layer

  The forming method used for printing the concavo-convex forming layer may be appropriately selected from known methods. For example, gravure printing, offset printing, intaglio printing, screen printing, flexographic printing, electrostatic printing, inkjet printing, and the like may be used.

  The thickness of the unevenness forming layer is preferably in the range of about 1 μm to 10 μm. However, the thickness of the unevenness forming layer in the transfer foil of the present invention is not limited to the above range.

  Moreover, the said uneven | corrugated formation layer may be formed by printing in multiple times using the printing plate from which the number of printing lines differs. By performing printing a plurality of times using printing plates having different numbers of plate lines, it is possible to form a concavo-convex shape due to the plate of the printed ink coating film. For example, in gravure printing, by performing printing a plurality of times using printing plates having different numbers of plate lines, it is possible to form a concavo-convex shape with diagonal / mesh plate.

  The unevenness of the unevenness forming layer may be formed by a hot embossing method. The hot embossing method is a mold transfer method in which the concavo-convex shape of the concavo-convex plate is transferred to the thermosetting resin by pressing the concavo-convex plate while heating.

(Pearl layer)
The pearl layer is formed immediately above the concavo-convex forming layer. The pearl layer contains a glittering material and imparts a pearl design.

  The pearl layer is formed by applying a pearl layer coating liquid in which a glittering material is dispersed in ink. At this time, since the true specific gravity of the glittering material is larger than that of the ink, it easily sinks in the coating surface during ink coating and deposits at the interface with the unevenness forming layer. Since the concavo-convex shape is provided at the interface between the concavo-convex forming layer and the pearl layer, the surface on which the deposited glittering material exists is three-dimensional along the concavo-convex shape. For this reason, when observing from the outer surface of a decorative molded product in which the transfer foil is integrated with the target article, the glittering material is arranged in a three-dimensional shape according to the concavo-convex shape of the concavo-convex forming layer. The design is observed. In addition, when observing from the outer surface of the decorative molded product, the pearl layer is not necessarily required to be transparent because the pearl layer is observed through the concavo-convex forming layer. For this reason, it is possible to select a glittering material without being limited to the glittering material having transparency. Therefore, since the selection range of the glittering material to be used can be increased, various designs can be realized.

The glittering material may be appropriately selected from materials that can scatter and disperse light. For example, (1) a product obtained by pulverizing the inner part of the shell, (2) a product obtained by pulverizing pearls, (3) a mica (mica), (4) a product obtained by coating mica fine particles with TiO ₂ , (5) Mica fine particles coated with a metal oxide, (6) metal fine particles such as aluminum powder, and the like may be used.

  The ink for dispersing the glittering material may be selected from known inks according to the selected glittering material. In addition, a colorant such as a dye or a pigment or a constitutional facial agent may be added to the ink in which the glittering material is dispersed in accordance with a desired design.

  The coating forming method used for coating the pearl layer may be appropriately selected from known methods according to the selected glittering material and ink. For example, gravure printing, offset printing, intaglio printing, screen printing, flexographic printing, electrostatic printing, inkjet printing, and the like may be used.

  The glitter material is preferably a glitter material having a bulk specific gravity in the range of about 0.7 to 1.8. If the bulk specific gravity of the glitter pigment is too smaller than the above range, the dispersibility of the glitter material in the ink is increased, and it becomes difficult for the glitter material to be deposited on the interface with the irregular surface layer. Is less likely to appear and the stereoscopic effect is reduced. On the other hand, when the specific gravity of the glittering material is too larger than the above range, the dispersibility in the ink is excessively lowered, so that the precipitate is precipitated in the ink and the coating property is greatly deteriorated. However, the bulk specific gravity of the glittering material used in the transfer foil of the present invention is not limited to the above range.

  The amount of the glittering material added is preferably in the range of about 1 to 30 parts by mass of the glittering pigment with respect to 100 parts by mass of the pearl layer coating liquid in which the glittering material is dispersed in the ink. . However, in the transfer foil of the present invention, the amount of the glittering material used is not limited to the above range.

  The particle diameter of the glittering material is preferably in the range of about 1 μm to 60 μm. The glittering material within the above range can be suitably applied in various printing methods (for example, gravure printing, offset printing, screen printing, flexographic printing, etc.). However, the particle size of the glitter material used in the transfer foil of the present invention is not limited to the above range.

(Adhesive layer)
The adhesive layer is formed on the pearl layer. When the transfer foil is integrated with the target article, the adhesive layer is a portion that contacts the target article and adheres the transfer foil to the target article.

  The material used for the adhesive layer may be appropriately selected from materials having adhesiveness and tackiness with the surface material of the target article at normal temperature and heating. Specifically, it may be appropriately selected from materials known as adhesives, pressure-sensitive adhesives, hot melts, and the like. For example, acrylic, epoxy, vinyl acetate, vinyl chloride, isocyanate, silicone, styrene-butadiene, vinyl chloride-vinyl acetate, ethylene-vinyl acetate, polyester, rubber chloride, chlorinated polypropylene Or polyurethane resins may be used alone, or emulsion resins, organic solvent-type resins, water-soluble resins, and the like mainly composed of a mixture thereof may be used.

  Moreover, as a formation method of an adhesive layer, you may carry out by apply | coating suitably using a well-known application | coating formation method according to the material used for an adhesive layer, and making it dry. For example, as a coating forming method, (1) printing method such as gravure printing, offset printing, screen printing, etc. (2) roll coating, reverse roll coating, gravure coating, reverse gravure coating, bar coating, rod coat, kiss coating, knife Coating methods such as coating, die coating, comma coating, flow coating, spray coating, and extrusion coating may be used.

  In addition, the thickness of the adhesive layer is preferably in the range of about 0.5 μm to 10 μm. However, the thickness of the adhesive layer in the transfer foil of the present invention is not limited to the above range.

  In addition, if the transfer foil of this invention is a structure which forms the pearl layer containing a glittering material directly on the uneven | corrugated formation layer which has an uneven | corrugated shape, there exists an effect to require | calculate. For this reason, the transfer foil of the present invention may have a configuration in which a functional layer is additionally added at the other layer interface except the layer interface of the unevenness forming layer / pearl layer.

FIG. 1 shows a schematic cross-sectional view as an example of the transfer foil 7 of the present invention.
A transfer foil 7 shown in FIG. 1 has a release layer 2 and a transfer layer 3 laminated on one surface of a base film 1. The transfer layer 3 is formed by laminating a surface protective layer 4 / an unevenness forming layer 8 / a pearl layer 9 / an adhesive layer 6 in this order. A pearl layer 9 containing a bright pigment is formed immediately above the concave / convex forming layer 8 having a concave / convex shape, and the bright material in the pearl layer 9 is three-dimensionally arranged. Moreover, since the uneven | corrugated shape of the uneven | corrugated formation layer 8 is eliminated by the pearl layer 9, the surface of the contact bonding layer 6 which contact | connects a decoration molded product is smooth.

Hereinafter, the decorative molded product of the present invention will be described.
The decorative molded product of the present invention is a decorative molded product using the transfer foil described above. By transferring the transfer foil of the present invention to a target article and peeling the base film and the release layer, a decorative molded product having the surface protective layer as the outermost surface can be obtained.

  In addition, the material of the target article to which the transfer foil is transferred is not particularly limited as long as it is a material that can be adhered to the material selected for the adhesive layer of the transfer foil. For example, the material of the target article is a polyolefin resin such as polyethylene or polypropylene, an acrylic resin, a vinyl chloride resin, an acrylonitrile-butadiene-styrene copolymer (ABS resin), a polycarbonate resin, a phenol resin, and the like. Also good. Further, the shape of the target article is not particularly limited as long as a transfer method is appropriately selected and used according to the shape. For example, the shape of the target article may be a sheet (film), a flat plate, a curved plate, a rod-shaped body, a three-dimensional object, or the like.

  In addition, the transfer foil is put into an injection mold, and the mold is closed. The molten resin is injected into the mold and injection molded, so that the transfer foil and the molded product are integrated to produce a decorative molded product. A simultaneous molding method (in-mold molding) may be used. By using in-mold molding, a design can be suitably imparted to an article having a three-dimensional shape (curved surface shape, uneven shape, perforated shape, etc.).

<Example 1>
Hereinafter, the transfer foil and decorative molded product of the present invention will be described with specific examples.

(Manufacture of transfer foil)
First, a release layer was formed on the base film.
At this time, the release layer was formed by applying a release layer coating solution on the base film. As the release layer coating solution, a melamine resin coating solution was used. A gravure coating method was used for applying the release layer coating solution. Further, a biaxially stretched polyethylene terephthalate film (thickness: 50 μm) was used as the base film. Moreover, the dry thickness of the formed release layer was 0.5 μm.

Next, a surface protective layer was formed on the release layer.
At this time, the surface protective layer was formed by applying a surface protective layer coating solution on the release layer. For the surface protective layer coating solution, an ultraviolet curable acrylic resin was used. The reverse gravure coating method was used for the coating method of the surface protective layer coating solution. The dry thickness of the formed surface protective layer was 10.0 μm.

Next, a concavo-convex forming layer was formed on the surface protective layer.
At this time, the uneven | corrugated formation layer was formed by performing gravure printing twice using the printing plate from which the number of printing lines differs. Thereby, the unevenness | corrugation by the printing grain could be formed in the coating surface. In the first gravure printing, printing was performed using a plate having 175 lines so that the thickness after drying was 1.0 μm. In the second gravure printing, printing was performed using a plate having 150 lines so that the thickness after drying was 1.2 μm. The ink used for gravure printing was a thermosetting ink.

Next, a pearl layer was formed on the unevenness forming layer.
At this time, the pearl layer was formed by applying a pearl layer coating solution. The pearl layer coating liquid was a gravure ink to which 5 parts by mass of a glittering material (average particle size: 30 μm) was added. For the application of the pearl layer coating liquid, gravure printing was used. The dry thickness of the formed pearl layer was 0.5 μm.

Next, an adhesive layer was formed on the pearl layer.
At this time, an acrylic resin system was used for the adhesive layer. Moreover, the dry thickness of the formed adhesive layer was 2.0 μm.

  From the above, the transfer foil of the present invention in which the film substrate / release layer / surface protective layer / unevenness forming layer / pearl layer / adhesive layer were laminated in this order could be produced.

(Manufacture of decorative molded products using transfer foil)
The transfer foil of the present invention produced as described above is placed in a mold, a resin is injected to the adhesive layer side of the transfer foil, a resin molded product is taken out from the mold, and a substrate is formed at the part of the release layer of the transfer foil. The film and the release layer were peeled from the resin molded product to obtain a decorative molded product (in-mold molding).

Next, the decorative molded product having the surface protective layer as the outermost surface was irradiated with ultraviolet rays, and the surface protective layer was crosslinked and cured. At this time, ultraviolet irradiation was performed using a high-pressure mercury lamp 120 W / cm and an integrated light amount: 1000 mJ / cm ² .

  From the above, a decorative molded product of the present invention was obtained. The outermost surface of the obtained decorative molded product was a surface protective layer, and the outermost surface was smooth. Further, when the obtained decorative molded article was observed, a pearl design having a three-dimensional feeling was observed.

  The transfer foil of the present invention is expected to be used in a wide range of fields for articles that require surface decoration. For example, portable information terminal casing, personal computer casing, air conditioner casing, TV casing, camera casing, home appliance operation panel, audio product panel, various equipment touch panel, automobile interior material, automobile exterior material, bicycle member, cosmetic container It can be used in fields such as food exterior materials, tableware, toiletries and toys.

DESCRIPTION OF SYMBOLS 1 ... Base film 2 ... Release layer 3 ... Transfer layer 4 ... Surface protective layer 6 ... Adhesive layer 7 ... Transfer foil 8 ... Concave-forming layer 9 ... Pearl layer

Claims (6)

A base film;
A release layer laminated on the base film;
A surface protective layer laminated on the release layer;
An unevenness forming layer laminated on the surface protective layer;
A pearl layer laminated on the concave-convex forming layer;
An adhesive layer laminated on the pearl layer,
The pearl layer contains at least a glittering material.   The transfer foil according to claim 1, wherein the glitter material is a glitter material having a bulk specific gravity of 0.7 to 1.8. The transfer foil according to claim 1, wherein the unevenness forming layer is formed by printing. 4. The transfer foil according to claim 1, wherein the unevenness forming layer is formed by performing printing a plurality of times using printing plates having different numbers of plate lines. The transfer foil according to claim 1, wherein the unevenness of the unevenness forming layer is formed by a hot embossing method.   A decorative molded product, the surface of which is decorated with the transfer foil according to claim 1.