JPH01280598A - Transfer of thin metallic film layer - Google Patents

Abstract

PURPOSE:To enable a metallic luster with excellent specular properties to be developed even on a medium having a rough surface, by pressing a transfer sheet and the medium against each other with a fluid UV-curable resin provided therebetween, and hardening the resin by irradiation with UV rays to transfer a thin metallic film layer onto the medium. CONSTITUTION:A transfer sheet 1 comprises at least one release layer 4 and at least one adhesive layer 5 thereon, which are provided before a thin metallic film layer 3 is provided on a transparent release film 2 having a smooth surface. At the time of transferring the transfer sheet onto a medium 7, a fluid UV curable resin 6 comprising epoxy acrylate or the like as a main constituent is applied to a transferring surface of the medium, and the transfer sheet and the medium are pressed against each other with the resin 6 therebetween. Next, irradiation with UV rays 11 is conducted to harden the resin, and the release film is released. Even when the surface of the medium is a minutely rugged rough surface, the fluid resin levels off the rugged surface, so that the thin metallic film layer is transferred constantly under the condition of excellent smoothness, and a metallic luster with excellent specular properties can be developed.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a method for transferring a gold B thin film, and more specifically, to a method for transferring a gold B thin film, which exhibits a metallic luster with excellent specularity even on a transferred object with a rough surface. The present invention relates to a transfer method capable of transferring a gold R thin film layer to be obtained.

[Conventional technology and the problem to be solved by the invention]

BACKGROUND ART Conventionally, a surface treatment has been carried out in which a transfer sheet having a metal thin film layer is used to transfer a core layer onto a transfer object, and the surface of the transfer object is given metallic luster by the metal thin film layer.

Examples of this type of transfer method include a method in which a transfer sheet having a gold R'r"N film layer is transferred using a heated roll, a method in which a metal thin film layer is transferred using a reactive hardening resin or an adhesive, etc. Are known.

However, according to the conventional method of transferring a metal thin film layer, if the surface of the object to be transferred is a rough surface with minute irregularities, the transferred metal thin film layer itself is inferior in smoothness corresponding to the rough surface condition. As a result, it was impossible to transfer a metal thin film layer with excellent specularity and metallic luster.

For example, in the former transfer method described above, although the adhesive for adhering the metal thin film layer to the object to be transferred is melted by the heat generated by the heating roll, it follows the minute irregularities on the surface of the object to be transferred and becomes rough. The condition also affects the thin film layer, making it difficult to obtain a mirror surface.Also, in the latter transfer method, there is a disadvantage that the curing time of the resin is long when using a reactive curable resin, and this curing time can be shortened. However, when using adhesives, the surface of the metal thin film layer becomes cloudy due to the heat generated by the curing reaction.On the other hand, in the case of adhesives, it is difficult to coat the surface of the object to be transferred with the adhesive so that it becomes a smooth surface. Since it is difficult to do this, there was a problem in that the surface of the metal thin film layer could not be made into a mirror surface.

The present invention has been made in view of the above-mentioned problems, and is a metal thin film layer that enables transfer of a metal thin film layer with excellent specularity and metallic luster even on a rough surface of a transfer target with fine irregularities. The purpose is to provide a transcription method.

[Means to solve the problem]

The present invention is a method for transferring a metal thin film layer to a transfer object using a transfer sheet formed by forming a metal thin film layer on the entire surface of one side of a transparent release film having a smooth surface. The gist of the present invention is a method for transferring a metal thin film layer, which is characterized in that the transfer sheet and the object to be transferred are pressure-bonded via a transparent resin, the resin is cured by irradiation with ultraviolet rays, and the release film is peeled off.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal section showing an example of a transfer sheet used in the transfer method of the present invention, and the transfer sheet 1 basically consists of a transparent release film 2 with a smooth surface and a transparent release film 2 formed on the release film 2. Consists of a metal thin film layer.

The above-mentioned release film 2 has an excellent surface smoothness to form a single metal layer with a good mirror surface, and is transparent (including semi-transparent ones) because ultraviolet rays can pass through it. ) is used, specific examples of which include polyester films with a thickness of 12 to 100 μm, nylon films with a thickness of 12 to 100 μm, polypropylene films with a thickness of 12 to 50 μm, etc. Among them, a polyester film having a thickness of 25 to 75 μm is preferred.

The metal thin film layer 3 is a gold i thin film made of metals such as aluminum, chromium, antimony, copper, silver, etc. or alloys thereof,
The N3 is formed by a vapor deposition method such as a vacuum deposition method, a sputtering method, an ion blasting method, or a plating method.

It is usually formed using aluminum by a vacuum evaporation method. The thickness of this layer 3 is 100-1000, preferably 1
00 to 300 people.

Considering the case where ultraviolet rays are irradiated through the core layer, the thickness of the thin film layer 3 is preferably 150 to 250, since this does not impede the transmission of ultraviolet rays and thus the curing of the resin.

The transfer sheet 1 in the present invention has gold B on the release film 2.
Prior to the formation of the Ei film layer 3, one or more release layers 4 can be provided, and the release layer plays a role of facilitating the release of the release film after transfer (only the film is peeled off from the release layer surface). At the same time, it remains on the metal thin film layer after peeling off and functions as a surface protective layer. The release layer 4 is made of a resin material such as methacrylic acid resin, a copolymer of methacrylic acid resin and styrene or acrylic acid, vinyl chloride-vinyl acetate copolymer, chlorinated rubber, cyclized rubber, nitrocellulose, cellulose acetate butyrate, etc. A vehicle with a dry weight of 0.7 to 10 g/rrf, preferably 1 to 5 g/n (and It is formed by coating it to make it look like this.

Further, at least one layer of the release layer 4 can be formed using an ultraviolet or electron beam curable resin that is solid at room temperature in an uncured state and has thermoplasticity, and when formed from the above resin, It has the advantage of having excellent chemical resistance, abrasion resistance, and scratch resistance. The resin used is, for example, an oligomer of epoxy acrylate, urethane acrylate, acrylic-modified polyester, etc., blended with monomers for the purpose of adjusting the crosslinked structure and viscosity, and further added with a photopolymerization initiator.

Furthermore, the transfer sheet 1 in the present invention has one or more layers of adhesive J! on the metal thin film layer 3. J5 can be provided, and by providing this adhesive layer, it is possible to further improve the adhesion stability of the ultraviolet curable resin to the metal thin film layer, which will be described later. The adhesive layer 5 is made of a resin material such as acrylic resin, vinyl acetate resin, rubber resin, olefin resin, vinyl chloride-vinyl acetate copolymer, diallyl chloride resin, or a mixture of epoxy resin, melamine resin, and acrylic resin. A vehicle consisting of the above is coated using the same coating method and coating thickness as the release layer.

Further, at least one layer of the adhesive N5 can be formed using an ultraviolet or electron beam curable resin that is solid at room temperature in an uncured state and has thermoplasticity, and when formed using the above resin, There is an advantage that low-temperature adhesion or adhesion to an ultraviolet curable resin surface can be improved. As the above-mentioned resin, a resin material corresponding to that used in the release layer can be similarly used.

In the transfer method of the present invention, when performing transfer onto an object using the transfer sheet 1 having the above-described structure, the fluid ultraviolet curable resin 6 is applied to the surface of the transfer sheet 1 opposite to the release film 2. Specifically, as shown in FIG. 2, the transfer sheet 1 and the transfer object 7 are heated with a transfer roll 8, with the curable resin 6 interposed between the transfer sheet 1 and the transfer surface of the transfer object 7. 9 in the figure indicates a coater roll for applying the ultraviolet curable resin.

The above-mentioned ultraviolet curable resin with fluidity uses oligomers such as epoxy acrylate, urethane acrylate, and acrylic modified polyester, and monomers such as neopentyl glycol acrylate and trimethylolpropane acrylate for the purpose of adjusting the crosslinked structure and viscosity. and a photopolymerization initiator. Here, "fluidity" refers to a resin state that can maintain a liquid state at room temperature.This resin is applied to a coating thickness of 10 to 100 ml by coating means such as Dalavia coating, roll coating, silk screen printing, and offset printing. 40μm
1. Apply to a predetermined surface so that the thickness is preferably 15 to 25 μm.

Next, the pressed transfer sheet 1 and the transferred object 7 are irradiated with ultraviolet rays 11 from a light source such as an ultraviolet lamp 10 to cure the ultraviolet curable resin 6 (6a in FIG. 2 indicates the cured ultraviolet curable resin). (indicates resin).

By curing the resin 6, the transfer sheet 1 and the object to be transferred 7 are fixed. This irradiation may be performed from the transfer sheet side as in this embodiment, or from the transfer object side if the object to be transferred is capable of transmitting ultraviolet rays. Since the film 2 is transparent, it is possible to irradiate ultraviolet rays from the transfer sheet side. Irradiation with ultraviolet rays is performed, for example, by running five high-pressure mercury lamps (120 W/cm) at a speed of 2 m/min.

After curing the resin 6 by irradiating the resin 6 with ultraviolet rays 11, the release film 2 is peeled off (FIG. 2), thereby obtaining a transfer target 7a on which the metal thin film layer 3 has been transferred, as shown in FIG. ,
The transfer of the metal thin film layer according to the invention is completed.

In the transfer method of the present invention, the fluid ultraviolet curable resin 6 as described above is interposed between the transfer sheet 1 and the transferred object 7 during the transfer, so that the fluid resin 6 as shown in FIG. In addition to compensating for the fine irregularities I2 on the surface of the transfer target 7, the resin surface 13 on the opposite side from the fine irregularities 12 of the resin 6
becomes a smooth surface, and the metal thin film M3 formed on the release film 2 with a smooth surface transfers onto the smooth surface 13 as it is, and as a result, the metal FiJ film 3 is affected by the fine irregularities 12 of the transfer target 7 As is clear from the above, even if the surface of the transferred object has a rough surface with minute irregularities, the transferred gold is transferred to the object 7 with a smooth surface. BF4FITi3 always maintains its smoothness, and therefore can exhibit excellent specular metallic luster.

The object to be transferred in the present invention is not particularly limited, and the transfer method of the present invention is particularly effective when applied to objects to be transferred such as rough-hewn metal surfaces, extruded plastic surfaces, and wooden surfaces. It is.

Next, the present invention will be explained in more detail by giving specific examples.

After gravure coating a 25 μm thick transparent polyethylene teresterate film (Diawheel Co., Ltd.: S type) with acrylic resin (Showa Ink Kogyo Co., Ltd.: Hakuri 35) so that the dry weight is 3 g/rrf. , 40
A first peeled layer is formed by drying for 1 minute at
Polyurethane resin (manufactured by Shiroze Ink:
A second layer of UMNa15) is formed, and then aluminum is vacuum-deposited on the entire surface to a thickness of 2.
50 people formed a metal thin film layer.

Next, a resin of vinyl chloride-vinyl butyrate copolymer (manufactured by Showa Ink Kogyo: HS-C; manufactured by Showa Ink Kogyo; HS-C;
Form a first adhesive layer consisting of E
A second adhesive layer made of an acrylic resin (MS-32, manufactured by Showa Ink Industries) was formed so that nr was obtained, thereby preparing a transfer sheet.

Next, an ultraviolet curable resin is applied to the surface of the aluminum extrusion molded material, which has a rough surface with a center line average roughness of 8 μm, using a roll coater to a coating thickness of 20 μm. Place the transfer sheet so that the second adhesive layer surface faces the resin-coated surface, apply pressure with a transfer roll to bond the transfer sheet and molding material, and then place it on the release film side of the transfer sheet. The resin was transported under an irradiation device consisting of five high-pressure mercury lamps (output 120 W/CI, including ozone) at a speed of 2 m/min, and irradiated with ultraviolet rays to cure the ultraviolet curable resin.

Next, the release film was peeled off, and the aluminum vapor-deposited layer was transferred to the molded material.

The surface of the aluminum vapor deposited layer transferred by the above transfer method had a metallic luster with good specularity, as shown by the center line average roughness of 0.1 μm.

For comparison, the above molding material was coated with a 25 μm thick polyester film and a release layer made of acrylic resin.
5μm pressure, 300mm thick aluminum vapor deposited layer, 2.5mm thick adhesive layer made of vinyl chloride-vinyl acetate copolymer resin.
Using a transfer sheet consisting of sequentially arranged micrometer-thick sheets,
When the aluminum vapor deposited layer was thermally transferred, the surface of the transferred first layer had poor specularity as shown by the center line average roughness of 2.0 μm.

〔Effect of the invention〕

As explained above, in the transfer method of the present invention, a fluid ultraviolet curable resin is interposed between the transfer sheet and the object to be transferred, the two are pressed together, and the curable resin is cured by ultraviolet irradiation. Since the transfer of the metal thin film layer is carried out using the transfer method, even if the surface of the transferred object has a rough surface with fine irregularities, the fluid resin compensates for the fine irregularities and the transferred metal thin film layer is always smooth. As a result, it is possible to transfer a metal thin film layer that can exhibit a metallic luster with excellent specularity.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing an example of a transfer sheet used in the transfer method of the present invention, FIG. 2 is a schematic vertical cross-sectional view showing an example of the transfer process by the transfer method of the present invention, and FIG. FIG. 4 is an enlarged sectional view for explaining the transferred state of the gold B thin film layer. 1. Transfer sheet 2 Transparent release film 3 Metal thin film layer 6 Ultraviolet curing resin 7 Transferred object 11 Ultraviolet light Fig. 1 Fig. 2 Fig. 3

Claims (6)

[Claims] (1) A method of transferring a metal thin film layer to a transfer object using a transfer sheet formed by forming a metal thin film layer on the entire surface of one side of a transparent release film with a smooth surface, which has a fluidity and ultraviolet curable property. A method for transferring a metal thin film layer, which comprises pressing the transfer sheet and the object to be transferred via a resin, and then irradiating the resin with ultraviolet rays to cure the resin and peeling off the release film. (2) Claim 1 in which a transfer sheet is used in which a metal thin film layer is formed after providing one or more release layers on one side of a release film.
Transfer method as described. (3) The transfer method according to claim 2, wherein at least one layer of the release layer is formed of an ultraviolet or electron beam curable resin that is solid at room temperature in an uncured state and has thermoplasticity. (4) The transfer method according to claim 1, 2 or 3, wherein a transfer sheet having one or more adhesive layers provided on the metal thin film layer is used. (5) The transfer method according to claim 6, wherein at least one adhesive layer is formed of an ultraviolet or electron beam curable resin that is solid at room temperature in an uncured state and has thermoplasticity. (6) The transfer method according to claim 1, 2 or 4, wherein a transfer sheet having a metal vapor deposited layer having a thickness of 100 to 300 is used.