JPH0367639B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an iris-treated transfer foil, that is, an iris transfer foil.

[Prior Art] Various iris transfer foils for transferring an iris pattern to a molded object have been proposed.

For example, (a) Iris transfer foil using a thin iris film layer made by depositing special compounds such as zinc sulfide, titanium oxide, tin oxide, magnesium fluoride, and copper iodide in multiple layers.

(b) An iris transfer foil using an iris thin film made of titanium oxide and a thin film layer as described in Japanese Patent Publication No. 37-8731.

(c) An iris transfer foil using an iris thin film layer consisting of a light reflecting film, an uneven interference resin film, and a translucent metal thin film as described in Japanese Patent Publication No. 52-1413, and the like.

However, each of these conventional iris transfer foils and methods of manufacturing them has drawbacks.

For example, in A, the laminated materials are special and generally expensive, and in order to fabricate A, it is necessary to deposit these materials unevenly to an optical thickness of about 1000 Å or more, making it unsuitable for mass production. The resulting iris transfer foil makes it difficult to adjust the iris pattern to any desired pattern.

In addition, because titanium tetrachloride gas is used as a raw material, chlorine gas is generated, which poses problems such as the health of workers during production, corrosion of production equipment, and environmental pollution, making it unsuitable for production. Even if it were produced, the iris transfer foil would be expensive due to pollution control costs and other costs.

Furthermore, since the iris pattern becomes an opaque transfer foil, the appearance of the fabric of the transferred molded product is impaired. In particular, when the transferred molded product is transparent, there is a drawback that when an opaque iris pattern is transferred, the surface is completely blocked, making it impossible to obtain a transparent iris molded product.

[Problems to be Solved by the Invention] The present invention improves the drawbacks of the iris transfer foil based on the conventional iris expression technology described above, and provides any desired variety and beauty without impairing the appearance of the transferred molded product. The purpose of this study is to obtain an iris transfer foil for producing a molded iris.

[Structure and operation of the invention] The present invention provides a transfer foil in which an iris thin film layer is provided on a sheet base material directly or via a release layer, and the iris thin film layer has a visible light transmittance of 50% or more. It is a laminated film consisting of a transparent thin film layer A and a transparent thin film layer B with visible light transmittance of 50% or more and unevenness, and the difference in refractive index between the thin film layers A and B is 0.05 or more. This is a distinctive iris transfer foil.

Hereinafter, the iris transfer foil according to the present invention will be explained with reference to FIGS. 1 to 6.

Here, the stacking order of the thin film layers is A/B/
A, Fig. 2 shows A/B, Fig. 3 shows B/A, and Figs. 4 to 6 show those to which an adhesive layer is added.

It goes without saying that the present invention is not limited to the following explanation.

The sheet base material 1 in the present invention includes plastic films such as polyester films, polycarbonate films, polypropylene films, cellophane and glassine paper, metal films,
This is exemplified by ceramic sheets, etc., and these may be a single layer or two or more layers bonded together, and the surface has been previously subjected to matte processing, hairline processing, spin processing, etc. But it is possible.

The release layer 2 in the present invention is a layer formed by coating cellulose, silicone, wax, resin, phospholipid, etc. alone or in combination on the sheet base material 1 by various known methods such as gravure coating and reverse roll coating. Generally, a film thickness of 0.05 to 1.0μ is preferable. The release layer 2 is not particularly necessary as long as the sheet base material has sufficient mold releasability, and the iris thin film layer 3 may be provided directly on the sheet base material.

The iris thin film layer 3 in the present invention is a transparent thin film layer A.
It is composed of a transparent thin film layer B with irregularities.
The transparent thin film layer A is exemplified by the following A to D, and is an uncolored or colored transparent film that has a refractive index difference of 0.05 or more from the thin film layer B and a visible light transmittance of 50% or more. It is a thin film layer. Furthermore, the thin film layer A
There may be light scattering on the surface or inside the film.

(a) A metal compound thin film layer exemplified by titanium oxide, silicon oxide, zinc oxide, antimony oxide, zinc sulfide, magnesium fluoride, potassium fluoride, cryolite, etc.

(b) Vinylidene chloride, vinyl chloride, vinyl acetate,
Thermoplastic resins such as copolymers with vinyl alcohol, etc., or copolymers of polyvinyl chloride, polyvinylidene chloride, or polystyrene with vinyl chloride or styrene have fine bubbles caused by nitrogen gas generated by photolysis. Thin film layer.

(c) Compositions containing polystyrene, polycarbonate, melamine resin, phenolic resin, vinyl copolymers including acrylics, cellulose copolymers, urethane copolymers, various curing agents for curing these, and curable functional groups. A thin film layer made of an organically substituted silicon compound, and a thin film layer made of the organic material and inorganic fine particles such as titanium oxide, aluminum oxide, zirconium oxide, etc.

d Titanium tetraethoxide, titanium tetra-n
- Metal alcoholate compounds such as propoxide, aluminum triethoxide, zirconium tetra-n-butoxide, di-isopropoxytitanium bisacetylacetate, tri-
Chelate compounds such as n-butoxide zirconium and monoethyl acetoacetate, zirconyl ammonium carbonate, or inorganic materials with liquid film-forming properties mainly composed of zirconium, or the above inorganic materials and alkyl silicates, and their hydrolysis. In addition, mixtures of colloidal silica sol, vinyl copolymers including acrylic ones, various fluorine-substituted polymers, polyester copolymers containing no aromatic rings, silicone polymers, and other organic materials and the above inorganic materials. A thin film layer consisting of a mixture.

If the difference in refractive index between the thin film layer A and the thin film layer B is less than 0.05, the iris pattern will be unclear. The thin film layer A does not necessarily need to be made of a single material, and may be a stack of two or more layers of different materials as long as the refractive index differs from the thin film layer B by 0.05 or more. Transparent thin film layer A made of a metal compound according to A
is deposited and laminated in a thin layer directly or via a release layer 2 on the sheet base material 1 by so-called vacuum deposition method or chemical vapor deposition method such as resistance heating or high frequency heating vapor deposition method, sputtering method, ion plating method, etc. .

The transparent thin film layer A made by Roni is thinly applied onto the sheet base material 1 directly or through a release layer 2 by various known methods such as gravure coating, reverse roll coating, and seal roll beating, and then dried. and laminate them. The thickness of the thin film layer A must be uniform in the range of 50 to 2000 Å and must have excellent transparency. If this thickness is less than 50 Å or more than 2000 Å, it will not be possible to obtain a beautiful iris thin film layer. It should be noted that if there are fine air bubbles in the thin film layer A, the iris will look more fantastic and the decorative effect will be greater.

Transparent thin film layer B with unevenness is exemplified by the following ho, and has a difference in refractive index from thin film layer A of 0.05 or more and a visible light transmittance of 50% or more. It is a colored or colored transparent thin film layer.
Furthermore, there may be light scattering on the surface and inside the film.

E Acrylic resin, urethane resin, epoxy resin, amino alkyd resin, polyester resin,
Thin film layers of transparent resins alone or in mixtures, such as urea-melamine resins, etc.

(f) Vinylidene chloride, vinyl chloride, vinyl acetate,
A thin film layer containing fine bubbles caused by nitrogen gas generated by photolysis in a thermoplastic resin such as a copolymer with vinyl alcohol, or a copolymer of polyvinyl chloride, vinylidene chloride, or polystyrene with vinyl styrene chloride. .

Compositions containing polystyrene, polycarbonate, melamine resin, phenolic resin, vinyl copolymers including acrylics, cellulose copolymers, urethane copolymers, various curing agents for curing these, and curable functional groups. a thin film layer made of an organically substituted silicon-based compound, and the organic material and titanium oxide, aluminum oxide,
A thin film layer made of inorganic fine particles such as zirconium oxide.

Titanium tetraethoxide, titanium tetra-n
- Metal alcoholate compounds such as propoxide, aluminum triethoxide, zirconium tetra-n-butoxide, di-isopropoxytitanium bisacetylacetate, tri-
Chelate compounds such as n-butoxide zirconium and monoethyl acetoacetate, zirconyl ammonium carbonate, or inorganic materials with liquid film-forming properties mainly composed of zirconium, or the above inorganic materials and alkyl silicates, and their hydrolysis. Furthermore, organic materials such as mixtures of colloidal silica gel, vinyl copolymers including acrylic ones, various fluorine-substituted polymers, polyester copolymers containing no aromatic rings, silicone polymers, and the above inorganic materials. A thin film layer consisting of a mixture of.

If the difference in refractive index between the uneven transparent thin film layer B and the thin film layer A is less than 0.05, the iris pattern will be unclear. The transparent thin film layer B having irregularities does not necessarily need to be made of a single substance, and may be a mixture of two or more substances.

The uneven transparent thin film layer B should not have a uniform thickness, but should have an uneven surface and a non-uniform thickness, and the thickness range is particularly preferably from 100 to 10,000 Å. In addition, in order to obtain a beautiful iris pattern, the difference in thickness between the concave and convex portions is 200 mm.
The thickness is preferably about 2000 Å. If it deviates from this range, no iris pattern will appear and the entire color will appear achromatic. Note that the wavelength of the unevenness (not necessarily constant) corresponds to the density of the iris pattern, so it is usually preferably about 0.5 to 10 cm, but it is not necessarily limited to this range. The uneven transparent thin film layer B can be applied by a general resin coating method such as roll coating or gravure coating, or a printing method.

The thin film layer B is not limited to those made of the various resins mentioned above, as long as the difference in refractive index from the thin film layer A is 0.05 or more.

Note that if the thin film layer B has fine air bubbles, it is possible to give a fantastic effect to the iris, as in the case of the thin film layer A.

When the transparent thin film layer A and the uneven transparent thin film layer B are laminated, the difference in refractive index and the unevenness of the surface of layer B result in an iris thin film layer that can be used as an iris transfer foil. The iris thin film layer 3 is A/B/A, A/
A beautiful iris pattern can be obtained with the laminated structure of B and B/A. A beautiful iris pattern can also be obtained in the case of B/A/B, but the iris effect is not sufficient considering the increase in production cost due to the provision of the second layer of B. Note that, depending on the purpose of use, a protective layer may be provided on the iris thin film layer 3 to improve water resistance and the like. When an adhesive layer, a protective layer, a metal layer, etc. are provided on the iris thin film layer 3 having the A/B/A or B/A configuration, a beautiful iris will not be lost regardless of the refractive index of these layers. However, the iris thin film layer 3 with the A/B configuration is
Beautiful iris will not disappear only if an adhesive layer, protective layer, metal layer, etc. with a refractive index difference of 0.05 or more is provided. Generally, when using a large amount of transfer foil on the target molded object such as cloth, paper, plywood, plastic sheet, etc., apply adhesive to the surface of the molded object, dry it,
There is a method of transferring a transfer foil after that. In addition, the outermost layer of the transfer foil is placed on the adhesive layer 4 on the iris thin film layer 3.
There is also a way to set it up. As shown in FIGS. 4, 5, and 6, if the adhesive layer 4 is provided in advance, it is easy to transfer a large amount to a small molded body. The adhesive layer is generally a heat transfer adhesive, but it may also be a room temperature adhesive layer, in which case a release paper is often laminated onto the adhesive layer 4.

The present invention will be described below with reference to Examples.

[Example 1] A 5% acetone solution of cellulose acetate was coated on one side of a 25μ thick biaxially stretched polyethylene terephthalate film using a gravure coating method.
It was dried at ℃ to form a release layer with a thickness of about 0.2μ. On top of this release layer, a Bergier type vapor deposition machine was used to deposit 5×
^Zinc sulfide (refractive index
2.35) was vacuum deposited. The thickness of the deposited zinc sulfide was 500 Å. A 10% methyl ethyl ketone solution of nitrocellulose (refractive index 1.51) was applied onto the zinc sulfide by moving a #8 bar coater intermittently about 3 cm over the uneven surface and dried at 150°C. The obtained laminated polyethylene terephthalate film had a beautiful transparent iris pattern with a bluish lateral pattern similar to that found in gravure rolls.

However, when transparent adhesive tape was pasted on the nitrocellulose-coated side of this film, the iris pattern disappeared.

Furthermore, zinc sulfide was deposited again on the nitrocellulose coating on one side of the iris-patterned film in a vacuum of 5×10 ^-2 Pascal using a Bergier type vapor deposition machine to obtain a thin film of 500 Å. When a transparent adhesive tape was attached to the vapor-deposited side of this film, this beautiful transparent iris pattern did not disappear. An adhesive was applied onto the vapor-deposited surface of this iris transfer foil, and after drying, it was transferred to a 2 mm thick transparent acrylic plate, resulting in a beautiful transparent acrylic plate with an iris pattern.

[Example 2] A 5% solution of cellulose acetate in acetone was coated on one side of a biaxially stretched polyethylene terephthalate film with a thickness of 18 μm and a width of 1 m using a gravure coating method.
It was dried at 120°C to form a release layer with a thickness of about 0.2μ.
Paint A (refractive index: 1.70) shown below was coated on this release layer by gravure coating, and dried at 150°C to obtain a 400 Å thin film.

Paint A: To 162 g of acetylacetone, 32.2 g of tetra-n-butyl titanate, 10 g of methanol-dispersed colloidal silica, and 0.11 g of silicone surfactant were added and mixed with stirring.

On top of this paint layer, nitrocellulose (refractive index
1.51) A 10% solution of methyl ethyl ketone containing 9.5 parts of epoxy resin (refractive index 1.55) and 0.5 parts was applied by gravure coating and dried at 150°C to obtain an uneven film of 200 to 2000 Å. The obtained laminated polyethylene terephthalate film exhibited a beautiful transparent iris pattern with various colors ranging from blue to red.

Furthermore, Paint A was again applied by gravure coating over the nitrocellulose epoxy coating on one side of the iris-patterned film to obtain a 400 Å thin film. A transparent and beautiful iris transfer foil. Furthermore, after applying an adhesive onto a 200 μm thick synthetic leather and drying it, the coating surface of the iris transfer foil and the adhesive layer were pressed and transferred, and a beautiful iris pattern appeared on the synthetic leather fabric.

[Effects of the Invention] The iris transfer foil of the present invention is a transfer foil in which an iris thin film layer is provided on a sheet base material directly or via a release layer, and the iris thin film layer has a visible light transmittance of 50%. A laminated film consisting of the above transparent thin film layer A and a transparent thin film layer B having visible light transmittance of 50% or more and unevenness, and in which the difference in refractive index between the thin film layers A and B is 0.05 or more. Since the iris transfer foil is characterized by the following: (a) a transparent thin film layer A and an uneven transparent thin film layer B;
We provide transfer foil with a colorful and beautiful iris pattern. The iris transfer foil according to the present invention takes advantage of its beautiful appearance characteristics and transfer functionality to be used in threads, packaging materials, wallpaper, posters, labels, women's clothing and belts, lures, fishing hooks, golf shafts, fishing rods, buttons, earrings, etc. Used for pendants, etc.

(b) By adjusting the thickness of the uneven transparent thin film layer B, it is possible to mass-produce an iris transfer foil having an iris pattern of any design.

C. A transparent iris molded product is provided by using a transparent body for the molded product to be transferred.

D. By transferring the iris pattern, the iris pattern can be easily applied to the surface of molded products in a wide range of fields.

By changing the shape to be transferred in various ways, it is easy to create a beautiful iris pattern that is a combination of the iris pattern and the shape to be transferred.

[Brief explanation of drawings]

1 to 6 are enlarged sectional views showing examples of the iris transfer foil according to the present invention. The stacking order of the thin films is A/B/A, A/B, and B/ in Figures 1 to 3, respectively.
A is shown, and FIGS. 4 to 6 show those shown in FIGS. 1 to 3 with an additional adhesive layer provided thereon. DESCRIPTION OF SYMBOLS 1... Sheet base material, 2... Release layer, 3... Iris thin film layer, 4... Adhesive layer, A... Transparent thin film layer, B... Transparent thin film layer with unevenness.

Claims (1)

[Scope of Claims] 1. A transfer foil comprising an iris thin film layer provided directly or via a release layer on a sheet base material, wherein the iris thin film layer is a transparent thin film having a visible light transmittance of 50% or more. Consisting of layer A and transparent thin film layer B with visible light transmittance of 50% or more and unevenness, and thin film layers A and B.
An iris transfer foil characterized in that it is a laminated film with a difference in refractive index of 0.05 or more. 2. The iris transfer foil according to claim 1, wherein the transparent thin film layer A has a thickness of 50 to 2000 Å, and the uneven transparent thin film layer B has a thickness of 100 to 10000 Å. 3. The iris transfer foil according to claim 1, wherein the transparent thin film layer A is made of one or more different metal compounds. 4. The iris transfer foil according to claim 1, wherein the transparent thin film layer A is made of a polymeric material having fine bubbles inside. 5. The iris transfer foil according to claim 1, wherein the transparent thin film layer A is an organic polymer thin film containing an organic polymer material and inorganic fine particles. 6. The iris transfer foil according to claim 1, wherein the transparent thin film layer A is made of an inorganic material capable of forming a liquid film and a mixture of the inorganic material and an organic material. 7. The iris transfer foil according to claim 1, wherein the transparent thin film layer A and the uneven transparent thin film layer B are a laminate of two or more layers of different materials. 8. The iris transfer foil according to claim 1, wherein the uneven transparent thin film layer B is made of one or more different resins. 9. The iris transfer foil according to claim 1, wherein the uneven transparent thin film layer B is made of a polymeric material having fine air bubbles inside. 10. The iris transfer foil according to claim 1, wherein the uneven transparent thin film layer B is an organic polymer thin film containing an organic polymer material and inorganic fine particles. 11. The iris transfer foil according to claim 1, wherein the uneven transparent thin film layer B is made of an inorganic material capable of forming a liquid film and a mixture of the inorganic material and an organic material. 12. The iris transfer foil according to claim 1, wherein the transparent thin film layer A and the uneven transparent thin film layer B are laminated in the order of A/B/A, A/B, and B/A.