JPH0655834A - Transfer foil - Google Patents

Abstract

PURPOSE:To provide a transfer foil having a peeling layer which has a protective function such as wear resistance or the like after transfer, can decorate again by printing or the like, and is good in transparency and free from whitening and turbidity. CONSTITUTION:At least, a peeling layer 3 formed by vapor deposition of inorganic fluorides such as cerium fluoride (CeF3), barium fluoide (BaF2), sodium fluoroaluminate (Na3AlFb), etc., and a functional layer 4 are provided onto a base material film 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer foil.

[0002]

2. Description of the Related Art Conventionally, a pattern forming method using a transfer foil is used for applying a pattern to an article which cannot be directly formed with a pattern, or for applying a special pattern such as a hologram image to an article. Is being carried out.

The transfer foil used here is a base film that serves as a support for the transfer layer until transfer, and a release film provided to facilitate removal from the base film during transfer and to protect the functional layer after transfer. It has at least a functional layer which is a layer, a hologram or a pattern provided by printing. If the functional layer has no adhesive function, it is necessary to further provide an adhesive layer on the functional layer.

At the time of transfer, the transfer foil is brought into close contact with the article, and the release layer, the functional layer and the adhesive layer (hereinafter referred to as the transfer layer) are transferred by a thermal transfer means such as a heating press.
A pattern is formed on an article (transfer target material).

Materials used for the release layer are thermoplastic acrylic resin, chlorinated rubber resin, vinyl chloride-vinyl acetate copolymer resin, cellulose resin, vinyl chloride resin,
It is a combination of a resin such as a chlorinated polypropylene resin and a lubricant such as oil silicone, fatty acid amide, zinc stearate, polyethylene wax, polypropylene wax and the like. The reason why the material is composed of two components, a resin and a lubricant, is that the surface protection of the transfer layer after transfer is poor when the resin alone is used.

However, when oil silicone, fatty acid amide, or zinc stearate is used as the lubricant, the adhesion between the release layer and the ink or the like is deteriorated. There is a problem that printing cannot be performed on the top.

On the other hand, when a low molecular weight polyolefin such as polyethylene wax or polypropylene wax is used as a lubricant, problems such as whitening of the resin and turbidity cannot be avoided, and when the release layer is used, the brightness of the functional layer is reduced. There is another problem that it ends up. Here, the brightness of the functional layer is the degree to which the underlying functional layer (printed pattern, relief hologram, etc.) can be clearly confirmed due to the presence of the peeling layer on the surface when the transfer is visually observed. That is.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems. The problem is that it has a protective function such as abrasion resistance after transfer, and it is Another object of the present invention is to provide a transfer foil having a release layer which can be further decorated and has no transparency or turbidity and which has good transparency.

[0009]

The present invention has been made in order to solve the above-mentioned problems, and in a transfer foil having a release layer and a functional layer at least sequentially formed on one surface of a base film, The release layer is a transfer foil, which is an inorganic fluoride.

The release layer is in the range of 100 to 3000 Å
Cerium fluoride (CeF)₃), Baliu fluoride
Mu (BaF₂), Sodium fluoroaluminate
(Na ₃AlF₆), Or a mixture of both
It also includes being composed of compound.

The present invention will be described in detail below with reference to the drawings.

The transfer foil of the present invention comprises a base film (1) / transfer layer (2) as shown in FIG.
After the transfer, the transfer layer moves onto the material to be transferred.

As the substrate film (1), a film having heat resistance enough to withstand heat during transfer, specifically, a polyester film, a biaxially oriented polypropylene film, a polycarbonate film, a cellophane film or the like is used. It is possible, and a thickness of about 10 to 100 μm is preferable. Among them, the polyester film is most preferably used because it is excellent in heat resistance, smoothness, physical strength and the like.

The transfer layer (2) is composed of a release layer (3), a functional layer (4) and an adhesive layer (5) which is provided if necessary from the side of the substrate film.

The release layer (3) was not peeled off from the base material film when the transfer layer was formed, that is, when the functional layer or the adhesive layer was applied and formed, and it was easily peeled off from the base material film during the transfer. Performance is required. In addition, mechanical strength such as abrasion resistance is required because it is necessary to protect the functional layer after transfer. Further, since the brightness of the functional layer cannot be reduced, surface smoothness and high transparency are also required.

The release layer in the present invention comprises a base film, cerium fluoride (CeF ₃ ) and barium fluoride (Ba).
F ₂ ), sodium fluoroaluminate (Na ₃ A
lF ₆₎ any one of, or is obtained by forming deposition of an inorganic fluoride consisting mixtures thereof.

The thickness of the release layer is preferably in the range of 100 to 3000Å. If it is 100 Å or less, it does not form a film and cannot sufficiently function as a peeling layer and a protective layer.

On the other hand, when the thickness is 3000 liters or more, the thin film loses flexibility and may cause film cracking in the process of applying the functional layer and the adhesive layer.

Inorganic fluorides generally have a low refractive index and thus have a low reflectance for visible light, and are thin films with good transparency. The above inorganic fluorides also have a wavelength of 0.55 μm.
Cerium fluoride 1.63, barium fluoride 1.48, sodium fluoroaluminate 1.3
When such an inorganic fluoride having a small refractive index as shown in No. 5 is provided on the functional layer, a highly transparent release layer can be obtained. .

As a means for providing such a release layer on the base material film, any of well-known physical film-forming methods such as a sputtering method and an ion plating method may be used in addition to the usual vacuum deposition method. I do not care.

The functional layer (4) ensures the original purpose of the transfer foil, and is a print pattern for decoration formed by a known printing method such as gravure printing, silk screen printing, offset printing, letterpress printing, or the like. Layers, or gold,
A reflection layer formed by vapor deposition of a metal such as silver, and a hologram layer provided with a metal reflection layer by vapor deposition after forming a hologram by heating and pressing with a surface relief hologram stamper. When the functional layer has an adhesive function, a low melting point thermoplastic resin is mixed.

The adhesive layer (5) is a thermoplastic resin such as polyester resin, acrylic resin, vinyl chloride resin, polyamide resin, polyvinyl acetate, rubber resin, ethylene-vinyl acetate copolymer resin, vinyl chloride-vinyl acetate copolymer resin. A resin can be used, and any resin is selected in consideration of the adhesiveness with the material of the functional layer and the material to be transferred. It is applied and formed by a method, and the film thickness is preferably 1 μm to 20 μm.

In FIG. 2, the transfer foil thus obtained is used as a transfer target material (6) for paper, vinyl chloride sheet, polyester sheet or the like.
It is a diagram in which the state at the time of transfer to is clearly illustrated.
That is, the adhesive layer coated surface is aligned with the material to be transferred (6), and the base material film (1) is heated and pressed to bond the adhesive layer (5) to the material to be transferred, and then the base material film. (1)
Is peeled off to complete the transfer.

After the transfer, as shown in FIG. 3, the transfer product has a cross-sectional structure such that the release layer (3) made of the above-mentioned vapor deposition film of inorganic fluoride appears on the surface.

[0025]

By using a vapor-deposited film of inorganic fluoride, which is made of ceramics and has a low refractive index, for the release layer, which has been conventionally made of a resin to which polyethylene wax or the like has been added, excellent abrasion resistance is achieved after transfer, and printing, etc. It becomes a highly transparent protective layer that can be further decorated.

[0026]

【Example】

<Examples 1 to 3> A 12 μm thick polyethylene terephthalate (PET) film (NS manufactured by Teijin Ltd.) was used as a base film, and a CeF ₃ vapor deposition film was formed on one surface of the film by a vacuum vapor deposition method using an electron beam heating method. Was set up. C
eF ₃ evaporated film thickness is 100Å, 1100Å, 3000
The case of Å is taken as Examples 1, 2 and 3, respectively.

Next, a vinyl chloride / vinyl acetate copolymer resin was varnished on the CeF ₃ to form a resin layer having a thickness of about 1.5 μm, and after aging at 60 ° C. for 72 hours, it was pressed with a press machine. The resin layer and the hologram forming surface of the stamper were put together, and embossing was performed under heating and pressure conditions of 130 ° C. and 40 kgf / cm ² , to form a hologram on the resin surface.

Next, about 500Å of aluminum is vapor-deposited on the surface of the resin layer, and a varnish containing a vinyl chloride / vinyl acetate copolymer resin and an acrylic resin is further applied to form a heat-sensitive adhesive layer of about 3 μm and hologram transfer. Got foil.

Then, the obtained transfer foil was formed to a thickness of 100 μm.
It was transferred onto the PET sheet by heating and pressing at 120 ° C. for 0.5 second.

After the transfer, the force required for peeling the substrate film (peeling strength) was measured using a tensile tester.
(Pulling width: 15 mm, pulling speed: 300 mm / mi
n, T type (90 degree) peeling)

When the residual state of the peeling layer after peeling the base film was examined by fluorescent X-ray analysis, both fluorine (F) and cerium (Ce) were detected from the transfer layer side, and the peeling layer was completely hologram surface. It was confirmed to be in.

The abrasion resistance of the transfer foil is JIS L0849.
According to the above, using a Gakushin type fastness tester, the transfer layer surfaces were rubbed with each other 20 times under a load of 200 g, and the visual evaluation: presence or absence of foil breakage (at least a part of the transfer layer peels off from the surface of the non-transfer member) And He-Ne laser light (63
The comparison was made according to the magnitude of the diffraction efficiency obtained from the intensity of the first-order diffracted light for 2.8 nm).

The adhesiveness of the ink was evaluated by a cellophane tape peel test according to JIS H8504 after printing a polyester ink by a silk screen printing method and drying it. The above results are shown in Table 1.

[0034]

[Table 1]

<Comparative Examples 1 and 2> Transfer foils were prepared in the same manner as in Examples 1 to 3 except that the thickness of the release layer provided on the base film was 80Å and 3500Å.
Evaluation was performed by the same method as described in Examples 1 to 3. The case where the thickness is 80Å is referred to as Comparative Example 1, and the case where the thickness is 3500Å is referred to as Comparative Example 2. The results are also shown in Table 1.

<Examples 4 and 5> The release layer provided on the substrate film was 1400Å BaF ₂ and 1400Å N.
except that a a ₃ AlF ₆ creates a transfer foil in the same manner as in Example 1-3, were evaluated in exactly the same manner as described in Examples 1-3. The case of BaF ₂ was taken as Example 4 and the case of Na ₃ AlF ₆ was taken as Example 5, and the results are also shown in Table 1.

Comparative Examples 3 to 5 On one side of a polyethylene terephthalate (PET) film (NS manufactured by Teijin Ltd.) having a thickness of 12 μm, a varnish made of the following resin was gravure plate to a thickness of 1 μm (10000 Å). Examples 1 to 3 except that coating was performed and the release layer of Examples 1 to 3 was replaced.
A transfer foil was prepared in exactly the same manner as in Example 1 and evaluated in the same manner as in Examples 1 to 3. The results are also shown in Table 1.

COMPARATIVE EXAMPLE 3 2.0% by Weight Polyethylene Wax Added to Methylmethacrylate Resin Comparative Example 4 2.0% by Weight Oil Silicon Added to Methylmethacrylate Resin Comparative Example 5 Methyl Methacrylate resin

[0039]

As described above, since the release layer of the transfer foil according to the present invention is made of an inorganic fluoride, it has a protective function such as abrasion resistance after transfer and can be further decorated by printing or the like. It has good transparency with no bleaching or turbidity.

[0040]

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view showing an example of a layer structure of a transfer foil of the present invention.

FIG. 2 is an explanatory diagram showing a state when transferring onto a surface of a transfer target material.

FIG. 3 is a cross-sectional explanatory view showing a state in which the transfer foil of FIG. 1 is transfer-formed on the surface of a transfer material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base film 2 Transfer layer 3 Release layer 4 Functional layer 5 Adhesive layer 6 Transfer material

Claims (4)

[Claims] 1. A transfer foil having at least a release layer having a protective property and a functional layer on a substrate film, wherein the release layer is a layer formed by vapor deposition of an inorganic fluoride. Foil. 2. The release layer is cerium fluoride (Ce).
F ₃ ), barium fluoride (BaF ₂ ), or sodium fluoroaluminate (Na ₃ AlF ₆ ),
Alternatively, the transfer foil according to claim 1, which is made of a mixture thereof. 3. The thickness of the release layer is 100 to 3000Å
The transfer foil according to claim 1 or 2, wherein the transfer foil is in the range. 4. The functional layer is a resin layer having a relief hologram formed thereon.
The transfer foil described in.