JPH11268169A - Photocatalytic function transfer foil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To give many functions to a surface of a various type material to be transferred by using a functional protective layer of a photocatalytic titanium oxide for a transfer foil constituting material. SOLUTION: A transparent or opaque plastic film is used as a base material, and a release layer having good adhesive properties, a functional protective layer having a photocatalytic function, an inorganic metal or inorganic metal oxide thin film layer and an adhesive layer are sequentially formed on the material. Here, the functional protective layer of a photocatalytic titanium oxide is used for a transfer foil constituting material. That is, the functional protective layer made of a paint in which the titanium oxide is dispersed is formed on the release layer having good adhesive properties with the material, a barrier layer of the inorganic metal or inorganic metal oxide thin film layer is formed on the protective layer, and further a thermoplastic adhesive layer having excellent adhesive properties is formed on the barrier layer. The barrier layer is a thin film layer made of an inorganic metal such as Sn, In, Au, Ag or the like, or an inorganic metal oxide such as silicon oxide, alumina or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to antibacterial, antifungal, antifouling, deodorizing and antifogging functions for various plastic sheets and boards such as PVC resin, polycarbonate resin and acrylic resin or the surface of wood and glass. It is a transfer foil that is capable of imparting the photocatalytic function of titanium oxide photocatalyst, etc., subjected to surface treatment by a conventional transfer method, various plastic sheets and plate materials or wood,
The present invention relates to a photocatalytic function transfer foil which can add not only decorative properties to a surface of glass or the like but also functionalities to add value and enhance product value.

[0002]

2. Description of the Related Art Conventionally, in order to impart an antibacterial and antifungal function and an antifouling function to the surface of various plastic sheets and plate materials or wood, glass, etc., a surface treatment process is performed using a transfer method, and various functions are performed. The transfer foil provided with was often used. However, in order to impart various functions, materials having the respective functions are required. That is, in order to impart antibacterial and antifungal functions, it is necessary to add and mix an antibacterial and antifungal agent in the coating film. It has to be added, and in order to impart anti-fogging function, it is necessary to use various kinds of functional materials in combination, for example, it is necessary to add an additive excellent in water repellency.

[0003]

SUMMARY OF THE INVENTION In view of the above problems, the present invention makes use of the photocatalytic action of anatase-type titanium oxide, which has been widely used as a white pigment, to invent transfer foils, thereby producing various types of plastic sheets. In addition, it is possible to semi-influentially impart many functions to the surface of a plate material or wood, glass, or the like. However,
When photocatalytic titanium oxide is irradiated with ultraviolet rays, electron-hole pairs are generated, and the holes react with water on the surface to generate hydroxyl radicals having strong oxidizing power. This oxidizing power has the effect of decomposing most of the organic compounds into water and carbon dioxide, so that sufficient care must be taken in laminating the organic compounds.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention uses a transparent or opaque plastic film as a base material, a release layer having good adhesion on the base material, and a function having a photocatalytic function. A protective layer, an inorganic metal or inorganic metal oxide thin film layer, and an adhesive layer are sequentially formed.
In the present invention, the use of a functional protective layer made of photocatalytic titanium oxide as a material for a transfer foil makes it possible to impart many functions to the surface of various materials to be transferred.

[0005] That is, the present invention provides a release layer having good adhesion to a substrate, which is a plastic film, and a functional protective layer comprising a coating material in which titanium oxide having a photocatalytic function is dispersed on the release layer. Further, a barrier layer of an inorganic metal or inorganic metal oxide thin film layer was formed on the functional protective layer, and a thermoplastic adhesive layer having excellent adhesion was formed on the barrier layer of the inorganic metal or inorganic metal oxide thin film layer. A photocatalytic function transfer foil, characterized in that the barrier layer is made of Al, Sn, In,
Au, one or more inorganic metals such as Ag, or silicon oxide, the photocatalytic function transfer foil is a thin film layer composed of one or more inorganic metal oxides such as alumina, the release layer,
Resin coatings such as fluororesin coatings and silicone resin coatings,
Or the photocatalytic function transfer foil is a metal oxide thin film such as silicon oxide or the like, as a release layer with good adhesion formed on the plastic film substrate, the photocatalytic titanium oxide action by ultraviolet light passing through the substrate film. The above photocatalytic transfer foil is provided with an inorganic metal thin film layer having an ultraviolet blocking function to suppress the expression.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The plastic film substrate in the present invention may be transparent or opaque. For example, various synthetic resin films such as polyethylene terephthalate, polyimide, polyamide, acryl, polycarbonate, polypropylene, polyvinyl chloride, ABS, etc. Alternatively, a sheet can be used depending on the application.
The thickness is not particularly limited, but operability, economy,
From the viewpoint of functionality and the like, those having a range of 4 to 100 μm are preferred.

The release layer having good adhesion to the substrate in the present invention is a resin coating such as a fluororesin coating, a silicon resin coating, or the like in order not to be oxidized and decomposed by the action of titanium oxide photocatalyst. It is preferably selected from thin films of metal oxides such as silicon oxide, and the thickness is not particularly limited, but is preferably in the range of 0.01 to 5 μm, and its forming method uses various coating methods. Or methods such as evaporation can be used.

In the present invention, the functional protective layer comprising a coating material in which titanium oxide having a photocatalytic function is dispersed is formed by using a known composition having a titanium oxide-based catalytic function by using various coating methods. The thickness is not particularly limited, but is preferably in the range of 1 to 10 μm.

In the present invention, the barrier layer of the inorganic metal or inorganic metal oxide thin film layer includes Al, Sn, In,
A thin film layer composed of one or more inorganic metals such as Au and Ag or one or more inorganic metal oxides such as silicon oxide and alumina is preferably formed by a method such as vapor deposition or sputtering. The thickness of these barrier layers is not particularly limited, but is preferably in the range of 10 to 200 nm, and when it is thinner than 10 nm, the function as a barrier layer is often insufficient, and when it is thicker than 200 nm,
There is no further improvement in barrier function, which is economically disadvantageous.

The thermoplastic adhesive layer in the present invention is appropriately selected from thermoplastic resins such as EVA resin (ethylene / vinyl acetate resin), acrylic resin and chlorinated polyolefin resin, and is used by dissolving in a solvent. Or, it is applied and formed in a molten state. The thickness of these adhesive layers is
Although not particularly limited, those having a range of 0.5 to 5 μm are preferable.

In the present invention, when an inorganic metal thin film layer is used for the release layer, it is effective not only as a barrier layer but also as a decorative vapor-deposited transfer foil having a metallic luster.

Hereinafter, the present invention will be described with reference to embodiments. Example 1 A 25 μm thick polyethylene terephthalate film was coated on one side with a fluororesin cured film as a release layer by gravure coating to a dry film thickness of about 1 μm, and then a fused silica sol as a photocatalytic titanium oxide paint as a functional protective layer. (TiO2 concentration 10% by weight, TiO2
/ Binder ratio = 60/40) by reverse coating to form a dry film thickness of about 3 μm. Further, silicon oxide is deposited on the surface of the functional protective layer by a vacuum evaporation method for about 50 n.
After forming m, a thermoplastic adhesive layer made of an EVA resin was applied by roll coating to a dry film thickness of about 8 μm to obtain a transfer foil of the present invention. Example 2 A silicon oxide thin film layer having a thickness of about 20 nm was formed as a release layer on one side of a polyethylene terephthalate film having a thickness of 25 μm by a vacuum deposition method, and then a fused silica sol (a photocatalytic titanium oxide coating material) was formed as a functional protective layer. TiO2 concentration 10% by weight, TiO2 / binder ratio =
60/40) was formed by reverse coating to a dry film thickness of about 3 μm. Further, an Al metal thin film was formed thereon by about 50 nm by a vacuum evaporation method, and then a thermoplastic adhesive layer made of an acrylic resin was applied by gravure coating to a dry film thickness of about 2 μm to obtain a transfer foil of the present invention. . Example 3 Each layer was formed in the same manner as in Example 2 except that an aluminum metal thin film layer was formed as a release layer on one side of a 12 μm-thick polyethylene terephthalate film by vacuum evaporation at a thickness of about 80 nm. Obtained. The photocatalyst transfer foil described in Example 1 was transferred to a wood surface, the photocatalyst transfer foil described in Example 2 was transferred to a polycarbonate plate, and the photocatalyst transfer foil described in Example 3 was replaced with PVC. After transfer processing to sheets and molding each, they were applied as interior building materials. In all cases, anti-fouling function effect against living pollution such as water, oil, bacteria, fungi, etc. was recognized, and superhydrophilization which is the action of photocatalytic titanium oxide The phenomenon of drop promotion by the phenomenon was also exhibited.

[0013]

The present invention makes use of the photocatalytic action of titanium oxide, which has been widely used as a white pigment, and invents a transfer foil, thereby allowing easy transfer to various plastic sheets and plate materials or the surface of wood, glass, etc. By the way,
It was possible to provide a photocatalyst transfer foil capable of imparting many functions.

Claims (4)

[Claims] 1. A method according to claim 1, wherein the base material is a plastic film.
A release layer having good adhesion to the substrate, a functional protective layer composed of a coating material in which titanium oxide having a photocatalytic function is dispersed on the release layer, and an inorganic metal or inorganic metal oxide thin film on the functional protective layer A photocatalytic transfer foil comprising a thermoplastic adhesive layer having excellent adhesion formed on a barrier layer of a layer and a barrier layer of the inorganic metal or inorganic metal oxide thin film layer. 2. The method according to claim 1, wherein the barrier layer is made of Al, Sn, In, A
The photocatalytic function transfer foil according to claim 1, which is a thin film layer composed of at least one of inorganic metals such as u and Ag, or at least one of inorganic metal oxides such as silicon oxide and alumina. 3. The photocatalytic transfer foil according to claim 1, wherein the release layer is a resin coating such as a fluororesin coating, a silicon resin coating, or a metal oxide thin film such as silicon oxide. 4. An inorganic metal thin film layer having an ultraviolet blocking function for suppressing the development of a photocatalytic titanium oxide effect due to ultraviolet light passing through the base film as a release layer having good adhesion formed on the plastic film base. The photocatalyst function transfer foil according to claim 1 provided.