JPH08142598A - Metallic gloss transfer foil with formability - Google Patents

Abstract

PURPOSE: To provide a better design feeling with a similar metallic gloss to a part whose elongation is small for a molding of three-dimensional shape provided with a part whose elongation of the transfer foil is large. CONSTITUTION: After a metallic thin film for preparing powder with hardened film, deposition or the like is formed at another mold releasing type base material, and the second hardened film is formed as a metallic gloss layer in the mold releasing type base material 2 of the transfer foil, the metallic thin film is peeled off together with both the hardened films, and metallic film powder ink layer 42 with elongation suitability by ink with metallic gloss pigment obtained by grinding it is used. For a part whose elongation is small at the time of transfer, a metallic thin film layer 41 by deposition or the like is formed partially. For a part whose elongation is large, the metallic thin film powder ink layer is formed partially at a different part from the metallic thin film layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer foil, and in particular,
The present invention relates to a highly decorative transfer foil capable of imparting a metallic luster to a deep-drawn part of a molded product by a simultaneous molding transfer method such as a simultaneous injection molding decoration method.

[0002]

2. Description of the Related Art Conventionally, a transfer foil has been widely used as a decorating means for a molded product. Especially, in the simultaneous molding transfer method in which the transfer is performed at the same time as the molding of the molded product, the transfer foil is stretched at the time of molding to form a three-dimensional shape It is possible to decorate the surface of the molded product. As such a molding simultaneous transfer method, an injection molding simultaneous decoration method of preforming transfer foil with an injection molding die or the like,
There is an in-mold injection molding simultaneous decoration method in which the transfer foil is molded by the heat pressure of the molten resin at the time of injection molding without preforming.
In particular, in the former case, since preforming is performed, it is possible to decorate the surface of a molded product having a complicated three-dimensional solid shape with a deeper drawing than the latter. In addition, a metal thin film transfer foil having a metal thin film layer partially formed by vacuum deposition of aluminum as a pattern is also used in order to impart a metallic luster and high designability.

[0003]

However, the metal thin film is difficult to stretch, and when the metal thin film is applied to a portion having a large stretch at the time of simultaneous molding transfer, that is, when molding the transfer foil, various cracks of various sizes may be formed on the metal thin film. However, because of the appearance of cracks, cloudiness, whitening, iridescent patterns, etc., the decoration of the metallic luster by the vapor-deposited thin film was limited to the design expression limited to the portion with little elongation. As a solution to this problem, an ink with a metal thin film powder as a pigment is used instead of the metal thin film layer to form a metallic luster layer. Since it is not a glossy film due to the above-mentioned surface, there is a problem that it has a slight cloudy feeling as compared with the metal thin film layer, the used area is conspicuous and the designability is deteriorated.

In view of the above, the transfer foil of the present invention solves the above-mentioned problems and provides a metallic luster transfer foil having a moldability that imparts metallic luster without giving an uncomfortable feeling even at a place where elongation at the time of transfer is large. Is.

[0005]

SUMMARY OF THE INVENTION Therefore, the metal glossy transfer foil having moldability of the present invention is a transfer foil having a metal glossy layer on one surface of a releasable substrate, wherein the metal glossy layer is made of a resin. A metal film for powder and a second cured film layer are sequentially formed on the cured film layer on the film, and then the metal film for powder is sandwiched between the cured film layer and the second cured film layer and the resin film. It is composed of a metal thin film powder ink layer formed by a metal thin film powder ink having a metal thin film powder obtained by peeling it off and pulverizing it. In the metallic luster transfer foil having the above-mentioned formability, the metallic luster layer is a partially formed metallic thin film powder ink layer, and the metallic thin film is partially formed in a portion different from the metallic thin film powder ink layer. It is also composed of layers. In addition, the metal glossy transfer foil having the above-mentioned formability may have a configuration in which a cured transparent layer is provided on the side of the releasable substrate directly below the metal thin film layer. Further, in the metallic luster transfer foil having the above-mentioned formability, a metal thin film powder ink layer is formed in a portion where the elongation of the transfer foil during molding is 10% or more, and a metal thin film layer is formed in a portion where the elongation is less than 10%. It is also a configuration formed selectively.

Hereinafter, the metallic luster transfer foil having moldability of the present invention will be described in detail with reference to the drawings. FIG. 1 is a vertical cross-sectional view showing an example of a metal luster transfer foil having moldability according to the present invention. In the figure, a metallic luster transfer foil 1 having moldability is provided with a release layer 3 and a cured transparent layer 7 on one surface (lower surface in the figure) of a releasable substrate 2, and a surface of the cured transparent layer 7. A metallic luster layer is partially formed on the metallic thin film layer 41.
The metal thin film powder ink layer 42 and the metal thin film powder ink layer 42 are partially provided in a pattern at different locations, and the pattern layer 5 and the adhesive layer 6 are further provided. At the time of transfer, the peeling layer 3 and below are separated from the releasable base material 2 as a transfer layer and transferred to the transfer target. Then, FIG. 2 is obtained after transferring the metallic luster transfer foil having the formability shown in FIG. 1 to a molded article substrate P having a transfer surface to which the transfer foil is stretched at a place such as a curved surface during molding. It is a longitudinal cross-sectional view showing an example of a decorative molded product. As shown in FIG. 2, a metal thin film powder ink layer 42 corresponds to a portion of the transfer foil where the elongation is large (left and right corner portions in the figure), and a metal thin film layer 41 corresponds to a portion where the elongation is small. Is transcribed. As the metal luster transfer foil having moldability of the present invention, as described above, in addition to the metal thin film layer 41 and the metal thin film powder ink layer 42, the release layer 3, the pattern layer 5 and the adhesive are usually provided on the releasable substrate 2. It is accompanied by the agent layer 6.

Examples of the releasable substrate 2 include polyester resins such as polyethylene terephthalate, polybutylene terephthalate and polyethylene terephthalate-isophthalate copolymers, polyolefin resins such as polyethylene, polypropylene and polymethylpentene, and polyvinyl fluoride. Fluorinated resins such as polyvinylidene fluoride, polytetrafluoroethylene, ethylene-4 fluoroethylene copolymer, polyamide resins such as 6-nylon and 6,6-nylon, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer Polymer, ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, polyvinyl alcohol, vinyl polymer such as vinylon, cellulose triacetate, cellulosic resin such as cellophane, polymethylmethacrylate, polyethylmethacrylate Polyethyl acrylate, acrylic resin such as polybutyl acrylate, polystyrene, polycarbonate, a single layer of a film using a single or a plurality of synthetic resins such as polyarylate or a film composed of a plurality of laminates of the film Can be used. Among them, a polyethylene terephthalate film is common. The thickness is usually about 12 to 100 μm.

A film made of the above resin may be used alone as the releasable substrate 2, but in order to adjust the releasability with the transfer layer, this film is used as the substrate film 21.
It is usual to apply a release layer 22 thereon. Release layer 22
Examples of the coating material include fluorocarbon resins, various waxes, silicone resins, and other known vehicles, such as acrylic resin, cellulose resin, vinyl resin, and ionizing radiation-curable acrylic resin. Alternatively, it is formed by extrusion coating a releasable resin such as a fluorine-based resin, a silicone resin, or a polyolefin resin. Further, in the transfer foil used for molding simultaneous transfer as in the present invention, from the viewpoint of heat resistance to heat and pressure at the time of transfer, as the thermosetting resin, acrylic resin, melamine resin, epoxy resin, epoxy-melamine resin, It is preferable that a urethane resin, a polyester resin, an aminoalkyd resin or the like is coated with a coating material containing a release agent such as silicone, a fluorine-based resin or paraffin, if necessary, and cured.

The peeling layer 3 serves as the outermost layer of the transfer layer to protect the surface after the transfer, and is usually provided. As the release layer 3, a coating liquid of a thermoplastic resin, or a known material such as a thermosetting resin or an ionizing radiation curable resin, particularly when surface scratch resistance, chemical resistance, stain resistance, etc. are required. Alternatively, it may be formed by applying ink or printing. The thickness of the release layer 3 is usually about 0.1 to 10 μm.

Examples of the above-mentioned thermoplastic resins include cellulose derivatives such as ethyl cellulose, cellulose nitrate, cellulose acetate, ethyl hydroxyethyl cellulose and cellulose acetate propionate, polystyrene, poly-α-methylstyrene, styrene copolymers and the like. Acrylic resin such as styrene resin, polymethylmethacrylate, polyethylmethacrylate, polyethylacrylate, polybutylacrylate, vinyl such as polyvinyl chloride, polyvinyl acetate, vinyl chloride-vinyl acetate copolymer, polyvinyl butyral, etc. Examples thereof include resins, rosins, rosin-modified maleic acid resins, rosin-modified phenolic resins, polymerized rosins, rosin derivatives such as rosin esters, coumarone resins, vinyltoluene resins, polyamide resins and other natural resins or synthetic resins. Further, as the thermosetting resin, for example,
Phenol resin, urea resin, diallyl phthalate resin,
Examples thereof include melamine resin, guanamine resin, unsaturated polyester resin, polyurethane resin, epoxy resin, aminoalkyd resin, melamine-urea co-condensation resin, and silicon resin such as polysiloxane. If necessary, a crosslinking agent, a curing agent such as a polymerization initiator, and a polymerization accelerator are used together. As the ionizing radiation curable resin, a resin obtained by using a polyfunctional oligomer such as urethane acrylate, epoxy acrylate, or acrylic acrylate, and a polymerizable monofunctional monomer or polyfunctional monomer is used.

The metal thin film layer 41 as the metallic luster layer 4 is
Since it is a thin film formed by metal deposition, sputtering, ion plating, etc., it is easy to obtain a high gloss feeling,
Since there is no elongation during molding transfer, it is mainly used in the area where the elongation is less than 10%. As the metal forming the metal thin film layer 41, for example, aluminum, chromium, nickel,
Metals such as cobalt, copper, gold, silver, tin, zinc, brass and stainless, alloys, metal oxides and the like. Thickness is usually 20
It is 0 to 800Å, preferably 400 to 600Å. In order to partially form the metal thin film layer 41, first, an unnecessary portion is provided with a water-soluble removal layer made of a water-soluble resin such as polyvinyl alcohol by printing or the like, and then a metal thin film is formed on the entire surface by vapor deposition or the like. Then, after washing with water, an alkaline aqueous solution or the like to remove the water-soluble removal layer and the metal thin film thereon, or a metal thin film is formed on the entire surface of the substrate by vapor deposition or the like, and the metal thin film is removed. A resist layer is formed on a portion that needs to be left, and then a metal thin film in an unnecessary portion is removed by a corrosive liquid such as acid or alkali.

The metallic thin film powder ink layer 42 as the metallic luster layer 4 is formed by an ink to which a metallic luster pigment added by powdering a metallic thin film previously formed by vapor deposition (on another substrate) is added. It is a layer having a metallic luster similar to that of the metal thin film layer 41. As such a metallic luster pigment, as shown in FIG. 4, a cured film layer 402 is formed on a substrate film 401, and a material and method similar to those of the metal thin film layer 41 are appropriately selected thereon, For example, the metal luster pigment raw material film 40 is obtained by forming a powder metal thin film layer 403 by vacuum deposition, sputtering or the like of aluminum, nickel, chromium or the like, and further forming a second cured film layer 404 thereon, From this, the powder metal thin film layer 403 is peeled from the substrate film 401 while being sandwiched by the cured coating layer 402 and the second cured coating layer 404, and the peeled product is finely pulverized by a roll mill or the like to a particle size preferable as a pigment. Obtained by

As the base film 401, the same one as the base film 21 described above such as a polyester film is used. Further, the cured film layer 402 and the second cured film layer 404 are preferably hard so as to be easily crushed, and a curable resin such as urethane resin, epoxy resin,
Melamine resin, amino resin, etc. can be used. Further, it is sufficient that the thickness of each of these films is about 1 μm. In addition, if these cured film layers are colored, for example, blue, the metallic luster pigment obtained can have a colored luster. The particle size of such a metallic luster pigment may be such that it does not hinder the formation of a metal thin film powder ink layer by a printing method such as gravure printing or silk screen printing, and is, for example, 1 to 200 μm. If the particle size is too small, the metallic luster is deteriorated, and if the particle size is too large, the pigment suitability when dispersed in the ink is deteriorated.

The metal luster pigment obtained by powdering a metal thin film thus obtained is mixed with a known vehicle to prepare a metal thin film powder ink, and the whole or a part thereof is prepared according to the required design design. To form a metal thin film powder ink layer. As the vehicle, vinyl chloride-vinyl acetate resin, urethane resin, polyester resin, or the like, or the resin described above as the resin for forming the release layer can be used. The printing method may be gravure printing, silk screen printing, offset printing, or the like, but from the viewpoint of high design appearance, silk screen printing is preferable because it allows thick printing. The thickness of the metal thin film powder ink layer is preferably about 0.5 to 200 μm, and is 0.5 μm.
When it is less than m, the gloss feeling is small, and when it exceeds 200 μm, the effect of the gloss feeling is saturated and an excessive amount of ink is required, resulting in a high cost.

It is important to properly use the metal thin film layer 41 and the metal thin film powder ink layer 42 as the metal gloss layer 4. Although the metal thin film layer 41 easily obtains a high glossy feeling, it does not follow the elongation at the time of transfer molding. In particular, when the elongation is 15% or more, the effect of sharing with the metal thin film powder ink layer 42 is remarkable. The metal thin film powder ink layer 42 is suitable for elongation because the metallic luster pigment as described above is dispersed in the ink layer made of resin, and cracks and whitening are less likely to occur than the metal thin film layer 41. However, since it is inferior in design to the metal thin film layer 41, the metal thin film layer 41 is used in a stretched portion during transfer molding.

A hardened transparent layer 7 is preferably provided as a base layer when the metal thin film layer 41 is formed.
The cured transparent layer 7 is particularly provided for the metal thin film layer 41, and the softening deformation of the layer adjacent to the layer due to the heat pressure during molding extends to the metal thin film layer 41 to generate a fine unevenness, resulting in a gloss. The occurrence of so-called "burn" that changes the feeling is prevented. As such a cured transparent layer 7, as a curable resin, a thermosetting resin such as a melamine resin, a urethane resin or an epoxy resin, or a coating such as an ionizing radiation curable resin such as an acrylate resin is applied. Form. When the cured transparent layer 7 is provided, it is sufficient to provide it at least on the base portion of the metal thin film layer 41, but it may be provided on the entire surface of the transfer foil in terms of manufacturing by the coating method. The thickness of the cured transparent layer is usually 0.2 to 3 μm, preferably 0.5 to 2 μm.

The pattern layer 5 is appropriately arranged as necessary so as not to overlap the metal thin film layer 41 and the metal thin film powder ink layer 42.
Alternatively, even if they are overlapped with each other, they are provided on the surface side of the metallic glossy layer 4 after the transfer. The pattern layer 5 is a known printing means, that is, a known ink, that is, an ink in which a colorant such as a pigment or a dye, an extender pigment, a material, a stabilizer, a plasticizer, a catalyst, a curing agent, etc. are mixed with a vehicle as required. Formed by.
As the vehicle, the resins listed in the above-mentioned release layer 3 can be used. If the pattern layer is formed by the same printing method as that for forming the metal thin film powder ink layer, the number of steps can be omitted if they are provided at the same time. The pattern layer forming process and the metal thin film layer forming process may be performed in any order, but the pattern layer forming process afterwards affects the manufacturing process of the metal thin film layer under vacuum. It is easy to obtain a glossy feeling of the metal thin film layer.

The adhesive layer 6 needs to be provided when the layer exposed on the transfer surface of the transfer foil does not have thermal adhesiveness like the metal thin film layer 41, but the exposed layer is It may be omitted if it has thermal adhesiveness under the heat and pressure condition at the time of transfer molding and has sufficient adhesiveness after transfer. As such an adhesive layer, a heat-sensitive adhesive is used, for example, an acrylic resin, a vinyl acetate resin, a vinyl chloride-vinyl acetate copolymer, a polyvinyl butyral resin, a polystyrene resin, a thermoplastic resin such as a polyamide resin, Alternatively, rubber-based resins such as polyisoprene rubber, polyisobutyl rubber, styrene-butadiene rubber, and butadiene acrylonitrile rubber may be used. The adhesive layer is
The above resin is formed by a known coating method, and the thickness thereof is usually about 0.5 to 10 μm.

The metallic luster transfer foil having moldability of the present invention has the above-mentioned constitution, but its use is, as described in the prior art, regardless of whether the transfer foil is preheated or not. It can be widely applied to a simultaneous molding transfer method in which a molded product is transferred simultaneously with injection molding. In addition to injection molding, transfer foil molding and resin molding such as a method of transferring at the time of cast molding may be combined regardless of the front and rear or simultaneous relationship to produce a decorative molded article. Can be effectively applied to the way that is stretched.

[0020]

According to the metal luster transfer foil having moldability of the present invention, since the metal thin film powder ink layer having the metal luster pigment obtained by a specific manufacturing method is used as the metal luster layer, the transfer foil is formed and transferred. Even if it is stretched, the metallic luster is not significantly reduced, so that an excellent metallic luster is retained. Further, by providing two kinds of metal gloss layers, such as the metal thin film powder ink layer and the metal thin film layer, when the transfer foil is molded and transferred and stretched, the metal thin film powder ink layer has a metallic gloss even when stretched. Since the decrease is small, an excellent metallic luster is retained. In addition, when a cured transparent layer is formed on the base on which the metal thin film layer is formed, the metallic luster of the metal thin film layer can be maintained at high quality during molding transfer. A three-dimensional shape obtained by applying such a metal thin film powder ink layer and a metal thin film layer to the former where the elongation of the transfer foil is 10% or more and the latter where the elongation of the transfer foil is less than 10%. With respect to the metallic luster of the decorative molded product, the metallic thin film powder ink layer and the metallic thin film layer have no discomfort.

[0021]

【Example】

<< Example 1 >> 1. Production of releasable base material Polyethylene terephthalate film (Toray Industries, Inc.)
Epoxy melamine resin (manufactured by Dainippon Ink and Chemicals, Inc.) was applied to T-60 # 50, thickness 50 μm by the gravure coating method, and then baked at 170 ° C. for 20 seconds,
A releasable substrate was used as a release layer of 0.3 g / m ² (coating amount when dried, the same applies hereinafter).

2. Formation of release layer and cured transparent layer Acrylic resin release ink (manufactured by Showa Ink Mfg. Co., Ltd., Haku 46-7) on the release layer of the above-mentioned release substrate.
Then, a peeling layer of 1 g / m ² was provided, and a 1 g / m ² cured transparent layer of a two-component curing type urethane resin was further provided thereon. These were applied and formed by the gravure coating method.

3. Formation of a metal thin film layer On the above-mentioned cured transparent layer, a water-washable primer ink (manufactured by Showa Ink Kogyo Co., Ltd.) is formed on a portion where the metal thin film layer is unnecessary by patterning a water-soluble removal layer by gravure printing, Then, a metal thin film of aluminum was formed on the entire surface including the above by a vacuum deposition method. Then, by performing a water washing treatment, the water-soluble removal layer was removed together with the metal thin film thereon, and a metal thin film layer was formed on a portion where a metallic luster was required. The metal thin film layer was a portion corresponding to the quadric surface (B portion in FIG. 3) and the flat surface portion (A portion in FIG. 3) of the molded product.

[0024] 4. Formation of metal thin film powder ink layer Next, a metal thin film powder ink (manufactured by Dainippon Ink and Chemicals, Inc.) with a metallic luster pigment obtained by vapor deposition of aluminum is silk-screen printed on the treated surface of the film. Then, a metal thin film powder ink layer was formed in a pattern of a thickness of 6 g / m ^{2 at} a place different from the metal thin film layer. The formed portion was a portion corresponding to a three-dimensional curved surface portion (C portion in FIG. 3) in which the transfer foil stretched by 10% or more during molding.

[0025] 5. Formation of pattern layer and adhesive layer As a pattern layer, an acrylic resin ink (GG, manufactured by Showa Ink Industry Co., Ltd.) was formed by gravure printing to a thickness of ² g / m ² . Then, a vinyl chloride-vinyl acetate ink (P Showa Ink Kogyo Co., Ltd.)
An adhesive layer of 1 g / m ² was formed by gravure printing by VHS). Thus, the metallic luster transfer foil having the moldability of the present invention was obtained.

6. Simultaneous transfer of transfer foil molding (performance evaluation test
Test) As shown in FIG. 3, the moldability of the present invention obtained above was applied to the entire outer surface of a spherical synthetic resin molded product having a length of 100 mm, a width of 100 mm, a height of 20 mm, and corners of four corners with radii of curvature of 20R. Simultaneous molding transfer was carried out by the injection-simultaneous decorating method (preheating of the transfer foil and pre-molding using an injection molding die) were performed on the metallic glossy transfer foil possessed, and the performance was evaluated. The injection resin was AS (acrylonitrile-styrene) resin (Styrac 767 manufactured by Asahi Kasei Corporation),
The injection molding conditions were a molding temperature of 220 ° C. and a molding time of 8 seconds.

Comparative Example 1 A metallic luster transfer foil of Comparative Example 1 was prepared in the same manner as in Example 1, except that the metallic luster layer was formed of a metal thin film layer.

Comparative Example 2 A metallic luster transfer foil of Comparative Example 2 was obtained in the same manner as in Example 1 except that the metallic luster layer was formed of the metallic thin film powder ink layer in Example 1.

Table 1 shows the performance evaluation results of the metallic luster design feeling of the metallic luster layer in the simultaneous molding transfer of Examples and Comparative Examples.

[0030]

[Table 1]

[0031]

EFFECT OF THE INVENTION Since the metallic luster transfer foil of the present invention is configured as described above, when it is used for simultaneous transfer of molding to a three-dimensional molded product having a deep drawing, the transfer foil is stretched to a stretched portion. Also, although it is slightly inferior to the unstretched part, a similar metallic luster can be imparted, and a three-dimensional molded article having a similar metallic luster to both the small elongation part and the large elongation part and having an excellent design feeling is obtained, The freedom of design expression increases.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an example of a metallic luster transfer foil having moldability according to the present invention.

FIG. 2 is a vertical sectional view showing an example in which the transfer foil of FIG. 1 is transferred to a molded product.

FIG. 3 is a perspective view showing a molded product decorated with a metallic luster transfer foil having moldability.

FIG. 4 is an explanatory view of a method for producing a metallic luster pigment that can be used for a metal thin film powder ink.

[Explanation of symbols]

1 Metallic glossy transfer foil 2 having moldability 2 Releasable substrate 21 Base film 22 Release layer 3 Release layer 4 Metallic gloss layer 41 Metal thin film layer 42 Metal thin film powder ink layer 5 Picture layer 6 Adhesive layer 7 Curing transparent Layer 40 Raw material film for metallic luster pigment 401 Base film 402 Cured coating layer 403 Metal thin film layer for powder 404 Second cured coating layer A Metallic luster layer transferred and formed on flat surface portion B Metal transferred and formed on secondary curved surface portion Gloss layer C Metallic gloss layer formed on the part of the three-dimensional curved surface with large elongation P Molded product substrate

Claims (4)

[Claims] 1. A transfer foil having a metallic gloss layer on one surface of a releasable substrate, the metallic gloss layer comprising a metal thin film layer for powder and a second curing on a cured film layer on a resin film. After forming the coating layers in order, the metal thin film layer for powder is peeled from the resin film together with the cured coating layer and the second cured coating layer sandwiching the layer, and the metal having the metal thin film powder obtained by pulverizing the metal film is obtained. A metallic glossy transfer foil having moldability, comprising a metallic thin film powder ink layer formed by a thin film powder ink. 2. The metal gloss layer comprises a metal thin film powder ink layer partially formed and a metal thin film layer partially formed in a portion different from the metal thin film powder ink layer. A metallic luster transfer foil having moldability according to claim 1. 3. The metallic luster transfer foil according to claim 1, which has a moldable transparent layer on the side of the releasable substrate directly below the metal thin film layer and has moldability. 4. A metal thin film powder ink layer is formed where the elongation of the transfer foil during molding is 10% or more, and a metal thin film layer is formed selectively where the elongation is less than 10%. A metallic luster transfer foil having moldability according to claim 1, 2, or 3.