JP2012201105A - Transfer foil and decorative molded article using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide transfer foil which has excellent stereoscopic feeling in provided design and is capable of expressing desired design, differently from the transfer foil to which only conventional picture printing is executed, and a decorative molded article using it.SOLUTION: In the transfer foil having a transfer layer on a release layer side on a release type film base material, the transfer layer is formed by laminating at least a stereoscopic design imparting layer, a design layer and an adhesive layer. By using the foil, an excellent stereoscopic feeling is obtained when the surface of the molding is decorated.

Description

  The present invention relates to a transfer foil and a decorative molded product using the same, and more particularly, to a transfer foil capable of giving a three-dimensional appearance in design and a decorative molded product using the same.

  Conventionally, as a technique for giving a three-dimensional effect to a plastic molded product in design, (1) a surface having a concavo-convex shape on the surface of the molded product, and (2) a three-dimensional printed layer using parallax for the decorative layer What is provided is known. As a method of (1), it is opposite to a method (for example, Patent Document 1) in which a desired concavo-convex shape is provided in advance on the cavity surface of a plastic injection mold or a decorative layer of a releasable film substrate. A method using a transfer foil provided with an unevenness providing layer on the side surface (for example, Patent Document 2) has been proposed. As the method (2), a transfer foil having a structure in which a first pattern layer, a transparent layer, a second pattern layer, a concealing layer, and an adhesive layer are sequentially laminated on a releasable film substrate is used. A method has been proposed (for example, Patent Document 3).

  In the case of the former (1), it is not preferable because a mold must be made for each concave / convex pattern and the cost increases. Further, in the latter case of the method (1), it is possible to give a concavo-convex shape to the surface of the molded product, but because the concavo-convex shape is transferred through the mold release film substrate, the pattern is transferred. It is difficult to reproduce the shape you want to give. In the case of the method (1), all of the methods are provided with an uneven shape on the surface of the molded product through a molding process, which is different from the method of giving a three-dimensional effect by printing. Furthermore, it is impossible to produce a molded product with a smooth surface finish.

  On the other hand, in the case of the above method (2), the three-dimensional design is expressed by printing. However, since it is necessary to provide a plurality of pattern layers, there are restrictions on the available printing machines, and printing is not possible. There is a risk that it may span multiple processes. In addition, since the three-dimensional condition is determined depending on the thickness of the transparent layer, there is a problem that a stereoscopic effect cannot be obtained depending on the viewing angle.

JP-A-9-26397 JP-A-1-120398 JP-A-2-310051

  The present invention has been made in view of the above-described circumstances, and unlike a transfer foil that has been subjected only to conventional pattern printing, the provided design has a good three-dimensional effect and expresses a desired pattern. It is in providing the transfer foil which can carry out, and the decorative molded product using the same.

  In order to solve the above-described problems, the transfer foil of the present invention has at least a three-dimensional design imparting layer, a design layer, and an adhesive layer as a transfer layer on the release layer side on the release film substrate. Is the basic configuration.

  That is, the invention according to claim 1 of the present invention is the transfer foil having the transfer layer on the release layer side on the release film substrate, wherein the transfer layer is at least a three-dimensional design imparting layer, a design layer, and an adhesive. It is a transfer foil characterized by laminating layers.

  The invention according to claim 2 of the present invention is the transfer foil according to claim 1, wherein the three-dimensional design imparting layer is formed of a resin layer having transparency.

  The invention according to claim 3 of the present invention is a molded product in which at least a part of the surface is decorated with the transfer foil according to claim 1 or 2.

  If the transfer foil of the present invention is used, the design layer provided through the three-dimensional design imparting layer is three-dimensional, so that the design can be given a sense of depth even after being transferred to the molded product.

  Moreover, when the said three-dimensional design provision layer has transparency, since the design layer laminated | stacked will not be obstruct | occluded by the three-dimensional design provision layer, it becomes possible to express arbitrary designs. Furthermore, since the three-dimensional design imparting layer may be colored or colorless as long as it has transparency, it is also possible to change the color of the design layer particularly in the case of colored transparency.

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

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

As shown in FIG. 1, the transfer foil 1 according to the present invention has at least a three-dimensional design imparting layer 4, a design layer 5, and an adhesive layer as a transfer layer 3 on the release layer side of the release film substrate 2. The basic configuration is that 6 are laminated.
By setting it as such a structure, the design layer 5 contains the three-dimensional design provision layer 4, and becomes a form printed in three dimensions. For this reason, the design is dramatically improved as compared with the case of only conventional pattern printing.
The design layer 5 can be a printed pattern layer, a metallic gloss layer such as sputtering or vapor deposition, or a metallic print layer, and can be provided according to a required design.
Moreover, when the in-mold molding which is one of the techniques of simultaneous injection molding is implemented using this transfer foil 1, the transfer layer 3 is peeled from the releasable film substrate 2 and the adhesive layer 6 is removed. Therefore, the design layer 5 given three-dimensionally is expressed as a design on the surface.

  Moreover, as shown in FIG. 2, the transfer foil 1 according to the present invention may be provided such that the three-dimensional design imparting layer 4 covers the entire surface of the releasable film substrate 2. By adopting such a configuration, the design layer 5 is not exposed on the outermost surface of the molded product, and is not directly damaged.

  In addition, as shown in FIG. 3, the transfer foil 1 according to the present invention may be provided with a surface protective layer 7 before providing the three-dimensional design imparting layer 4. By adopting such a configuration, it becomes possible to protect the outermost surface of the molded product with the surface protective layer 7 regardless of the formation area of the three-dimensional design imparting layer 4, and surface properties such as scratch resistance of the molded product. Will improve.

  Moreover, the transfer foil 1 according to the present invention may be provided with a concealing layer 8 between the design layer 5 and the adhesive layer 6 as shown in FIG. By setting it as such a structure, the reproducibility of the design of the provided design layer 5 improves, and it becomes difficult to receive the influence of the color of an injection molding resin base material.

  The surface protective layer 7 and the concealing layer 8 are layers provided as necessary, and either one or both of them may be provided.

  Next, each material which comprises the transfer foil which concerns on this invention, and a manufacturing method are demonstrated.

(Releasable film substrate)
As the releasable film base material 2, a laminate of a base material layer 21 and a release layer 22 can be used as shown in FIG. 1. The material of the base material layer 21 is not particularly limited as long as it is flexible. Examples thereof include polyester resins such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate, polyethylene, polypropylene, polybutene, polymethylpentene, and ethylene-propylene. -Polyolefin resin such as butene copolymer, polyamide resin such as nylon 6 and nylon 66, polyvinyl chloride and the like can be used. Among these, a uniaxial or biaxially stretched polyester film is more preferable because of its excellent heat resistance.
The thickness of the releasable film substrate 2 is preferably about 5 μm to 200 μm, more preferably about 25 μm to 100 μm.
As a material for the release layer 22, a release resin, a resin containing a release agent, or the like can be used. As the releasable resin, for example, melamine resin, acrylic resin, polyester resin, urethane resin, fluorine resin, silicone resin, epoxy resin and the like can be used. These resins can be used singly or in combination of two or more.
Examples of the resin containing a release agent include an acrylic resin, a vinyl resin, a polyester resin, and a fiber obtained by adding or copolymerizing a release agent such as a fluorine resin, a silicone resin, or various waxes. An elemental resin or the like can be used.

As a method for forming the release layer 22, the above resin is dispersed or dissolved in a solvent, roll coat, reverse roll coat, gravure coat, reverse gravure coat, bar coat, rod coat, kiss coat, knife coat, die coat, A method of forming by removing the solvent by applying and drying by a coating method such as comma coating, flow coating, or spray coating can be used.
The thickness of the mold release layer 22 should just be about 0.1 micrometer-5.0 micrometers, More preferably, it is about 0.3 micrometer-2.0 micrometers.

(Transfer layer)
Next, the transfer layer of the transfer foil according to the present invention will be described.
As shown in FIG. 1, the transfer layer 3 has a basic configuration in which at least a three-dimensional design imparting layer 4, a design layer 5, and an adhesive layer 6 are laminated. If necessary, as shown in FIG. 3, the surface protective layer 7 may be provided on the surface of the release layer 22 in advance, or the concealing layer 8 may be provided between the design layer 5 and the adhesive layer 6. It is also good.

(Three-dimensional design grant layer)
The resin constituting the three-dimensional design imparting layer 4 is not particularly limited as long as it is a material that can withstand a load such as heat and pressure applied when decorating the surface of a molded product. Urethane resin, acrylic resin, polyester It can be appropriately selected from a resin based on resin. The curing method can also be appropriately selected from a one-component curing type, a two-component curing type using a curing agent, a curing type by active energy ray irradiation, and the like.

As a method for forming the three-dimensional design imparting layer 4, known printing methods such as gravure printing, offset printing, intaglio printing, screen printing, flexographic printing, and ink jet printing can be used.
The thickness of the three-dimensional design imparting layer 4 is arbitrarily determined in view of the required design properties, and is not particularly limited, but an effect can be expected if it is about 0.1 μm to 50 μm.
In addition to the printing method, the three-dimensional design imparting layer 4 can also be formed by embossing. In this case, the three-dimensional design imparting layer 4 is formed by pressing an embossed plate imparted with a desired shape against the three-dimensional design imparting layer before embossing provided in advance by a known printing method or coating method. Can be formed. In addition, there is no restriction | limiting in particular in the shape provided by embossing, Arbitrary shapes can be used according to the design requested | required. The embossing process may be performed at any timing before the adhesive layer 6 is formed. For example, even after the formation of the three-dimensional design imparting layer before the embossing, the embossing process is performed after the design layer 5 is formed. It doesn't matter. By forming the three-dimensional design imparting layer 4 by embossing, a sharper shape can be reproduced, and further design enhancement can be achieved.

(Surface protective layer)
When the surface protective layer 7 is formed, the constituent resin is not particularly defined as long as it satisfies the required physical properties such as weather resistance, abrasion resistance, scratch resistance, chemical resistance, and the like. And can be appropriately selected from urethane resins, acrylic resins, polyester resins, and the like. The curing method can also be appropriately selected from a one-component curing type, a two-component curing type using a curing agent, a curing type by active energy ray irradiation, and the like. Moreover, you may add various additives, such as a ultraviolet absorber, a light stabilizer, a heat stabilizer, a lubricant, a flame retardant, an antiblocking agent, to the surface protective layer 7 as needed.

Here, in this invention, the following methods can be used as a form in the case of using the said active energy ray hardening-type resin as a surface protective layer.
The first is a method for producing a transfer foil by irradiating an active energy ray after coating the resin and completely curing it. The second method is a method in which the active energy ray is not irradiated after the coating, and is irradiated and completely cured after the transfer to the transfer target is completed. Details of the usage pattern in the case of the second method are as follows. First, the active energy ray-curable resin is dissolved or dispersed in a solvent and coated on the releasable film substrate 2 by a method such as reverse gravure coating, and then the solvent is evaporated and dried. The crosslinked and cured resin layer in an uncrosslinked state is produced by solidifying without sticking while being crosslinked.
At that time, if necessary, the active energy ray is irradiated in an appropriate amount within a range that does not impair the shape followability to the surface shape of the transfer object, and the incomplete (partially) crosslinked state is obtained. It may be more completely dried than the cross-linked state, or the cross-linked cured resin layer may be prevented from flowing due to heat or stress during transfer.
The transfer foil thus obtained is transferred while following the surface shape of the transfer object. At this time, since the crosslinked cured resin layer is not completely crosslinked, the thermoplasticity is maintained. Therefore, it is possible to follow the surface shape of the transfer object. Thereafter, the cross-linked cured resin layer is completely cross-linked and cured by irradiating active energy rays. Thereby, the crosslinked cured resin layer can achieve both sufficient scratch resistance (hard coat property) and moldability.

As a method for forming the surface protective layer 7, known coatings such as roll coat, reverse roll coat, gravure coat, reverse gravure coat, bar coat, rod coat, kiss coat, knife coat, die coat, comma coat, flow coat, spray coat, etc. The method can be used.
The thickness of the surface protective layer 7 is preferably about 3 to 15 μm.

(Design layer)
When a printed pattern layer is formed as the design layer 5, a known ink can be used. In other words, colorants such as dyes or pigments and extenders are added to the vehicle, and plasticizers, stabilizers, waxes, greases, desiccants, curing agents, thickeners, dispersants, fillers, etc. are optionally added. Then, it may be sufficiently diluted and stirred with a solvent, a diluent or the like.

  As a method for forming the printed pattern layer, known printing methods such as gravure printing, offset printing, intaglio printing, screen printing, flexographic printing, electrostatic printing, and inkjet printing can be used.

When forming a metallic luster layer or a metallic print layer as the design layer 5, for example, it can be a metal vapor-deposited thin film layer made of metal or the like formed by vapor deposition or the like.
Depending on the metallic luster color to be developed, the material may be a metal such as aluminum, tin, chromium, nickel, gold, platinum, silver, copper, indium, titanium, zinc, or an oxide thereof, and an alloy thereof or Compounds can be used.
As a method for forming the metal thin film layer, a method such as a vacuum deposition method, a sputtering method, an ion plating method, or a plating method can be used.

  Moreover, as a metallic luster layer or a metallic tone printing layer, it can be set as the layer printed in part or the whole surface with the ink containing metal pigments, such as aluminum flakes, for example. As a method for forming the metallic print layer, a known printing method such as a gravure printing method or a screen printing method can be used.

(Hidden layer)
When forming the concealing layer 8, known inks used for forming the printed pattern layer of the design layer 5 can be used similarly.

  As a method for forming the concealing layer 8, known printing methods such as gravure printing, offset printing, intaglio printing, screen printing, flexographic printing, electrostatic printing, and ink jet printing can be used.

(Adhesive layer)
In the present invention, the adhesive layer 6 is used for adhering the transfer layer 3 to a molded product, and has an adhesive strength at room temperature or a material that exhibits adhesiveness or adhesive strength by a treatment such as heating. Can do.

The material of the adhesive layer 6 is not particularly limited as long as it has adhesiveness and / or tackiness, and includes what are called adhesives, adhesives, and hot melts.
For example, acrylic, epoxy, vinyl acetate, vinyl chloride, isocyanate, silicone, styrene-butadiene, vinyl chloride-vinyl acetate, ethylene-vinyl acetate, polyester, rubber chloride, chlorinated polypropylene Examples thereof include emulsion resins, organic solvent-type resins, water-soluble resins, etc., each of which uses a single resin such as a polyurethane resin or a polyurethane resin alone, or a mixture thereof.

As a method for forming the adhesive layer 6, a coating liquid obtained by diluting the above resin with water or an organic solvent, a printing method such as gravure printing, offset printing, or screen printing, or roll coating, bar coating, comma coating, etc. It can be applied by a coating method such as spray coating or extrusion coating, followed by drying or cooling.
The thickness of the adhesive layer 6 is not particularly limited, but is usually about 1 μm to 10 μm.

(Transfer material)
The material to be transferred to the transfer foil of the present invention is not limited in material and shape. For example, the material is polyolefin resin such as polyethylene and polypropylene, acrylic resin, vinyl chloride resin, acrylonitrile-butadiene- Resin such as styrene copolymer (ABS resin), polycarbonate resin, phenol resin, or metal or metal compounds such as aluminum, iron, stainless steel, brass, wood plywood, wood veneer, medium density fiberboard (MDF) ), Etc., ceramics such as glass and ceramics, ALC (lightweight cellular concrete), GRC (glass fiber reinforced concrete), cement such as slag cement, calcium silicate, paper, fabric, nonwoven fabric and the like.
Also, the shape is arbitrary such as a sheet (film), a flat plate, a curved plate, a rod-shaped body, a three-dimensional object and the like. A transfer method can be appropriately selected and transferred depending on the uneven shape of the transfer surface.

  Using a biaxially stretched polyethylene terephthalate film with a thickness of 50 μm as the base layer of the releasable film base, and after drying the melamine resin coating liquid on one side of the base layer by the gravure coating method The release layer was formed by coating so as to have a thickness of 2.0 μm.

Next, the following layers were sequentially laminated as a transfer layer on the release layer.
First, as a surface protective layer, an ultraviolet curable acrylic resin is applied by a reverse gravure coating method so that the thickness after drying becomes 5.0 μm, and an integrated light quantity is 1000 mJ using a high pressure mercury lamp 120 W / cm. The resin was crosslinked and cured by irradiating with ultraviolet rays so as to be / cm 2.

  Next, on the surface of the surface protective layer, a UV-curable transparent acrylic resin was pattern-printed by screen printing so that the uneven height difference after drying was 30 μm at maximum, thereby forming a three-dimensional design imparting layer. . At this time, using a high-pressure mercury lamp 120 W / cm, it was cured by irradiating with ultraviolet rays so that the integrated light amount was 200 mJ / cm 2.

  Next, on the surface of the three-dimensional design imparting layer, a metal serving as a solid print layer while filling the uneven shape of the three-dimensional design imparting layer using screen-printed ultraviolet curable silver ink (including aluminum paste). A tone print layer was formed. The formed metallic printing layer was crosslinked and cured by irradiating with ultraviolet rays using a high-pressure mercury lamp 120 W / cm so that the integrated light amount became 500 mJ / cm 2.

  Next, on the surface of the metallic tone printing layer, a one-part curable acrylic resin adhesive layer is applied by gravure printing so that the thickness after drying becomes 5.0 μm, and the transfer foil according to the present invention is applied. Obtained.

  When the transfer foil produced as described above was used for injection molding (in-mold molding) and transferred to the surface of the molded product, a molded product having an unprecedented three-dimensional effect could be obtained.

  The transfer foil of the present invention can give a good three-dimensional feeling to the transfer surface of various substrates such as paper, plastic, and inorganic materials. For example, the exterior of various electrical appliances such as mobile phones and laptop computers It can be used for various applications that require parts, vehicle interior parts such as automobiles, and other decorations.

DESCRIPTION OF SYMBOLS 1 ... Transfer foil 2 ... Releasable film base material 3 ... Transfer layer 4 ... Three-dimensional design provision layer 5 ... Design layer 6 ... Adhesive layer 7 ... Surface protective layer 8 ... Concealing layer 21 ... Base material layer 22 ... Release layer

Claims (3)

  A transfer foil having a transfer layer on a release layer side on a release film substrate, wherein the transfer layer is formed by laminating at least a three-dimensional design imparting layer, a design layer, and an adhesive layer. .   The transfer foil according to claim 1, wherein the three-dimensional design imparting layer is formed of a resin layer having transparency.   A molded product having at least a part of the surface decorated with the transfer foil according to claim 1.

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