JPH0737596B2 - Transfer material exhibiting metallic luster and method for producing substrate having metallic luster - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention provides a transfer material that exhibits a metallic luster that does not impair the beautiful metallic luster design even after heat treatment after transferring the transfer layer to the surface of the base material, and a beautiful translucent material even after heat treatment. The present invention relates to a manufacturing method for obtaining a base material having a metallic luster in which resistance such as surface strength and adhesion to a base material is enhanced without impairing the metallic luster design.

[Prior art]

Conventionally, a transfer printing method has been widely used as one of the methods for coloring and decorating various heat resistant substrates. What is the transfer printing method?
A release layer is provided on the base sheet, and letters,
An arbitrary printed pattern such as a pattern is formed by an ink containing a pigment, a resin binder, etc. as an ingredient, and an adhesive layer is provided thereon to form a transfer material, and then a substrate to be a transfer target on the printing surface of the transfer material. Heat and pressure treatment is performed by stacking the materials, and after that,
In this method, the printed pattern is transferred onto the heat-resistant substrate by peeling off the base sheet from the release layer, thereby coloring and decorating the heat-resistant substrate. When improving the resistance such as the surface strength of the printed pattern of the base material obtained by this transfer printing method and the adhesive force with the base material,
Heat treatment is performed in a heating furnace. By heating, the polymer substance forming the peeling layer or the adhesive layer on the surface accelerates the reaction and crosslinks to form a network structure. Therefore, the surface hardness is enhanced, and the adhesion force with the base material is also improved. In this way, the desired resistance is obtained. When a design having a metallic luster pattern instead of the printed pattern is required, a transfer material in which a metal thin film layer formed by a vapor deposition method is entirely or partially provided between the peeling layer and the adhesive layer is used.

[Problems to be Solved by the Invention]

However, when the heat treatment is performed to improve the surface strength of the metallic luster pattern of the base material obtained by using this transfer material and the resistance to the adhesion strength with the base material, the following problems occur. That is, when the heat treatment is performed, the adhesion between the metallic luster pattern and the base material is improved, but fine projections are generated on the surface of the release layer having the metal thin film portion, and the surface strength is not always good. In addition, since the smoothness is impaired, only the design in which the metallic luster pattern has remarkably deteriorated can be obtained (see FIG. 2). Therefore, the present inventors have investigated the cause of the generation of fine protrusions on the surface of the metal thin film portion when heat treatment is performed. That is, due to the transfer method at the time of transfer, dust entering between the adhesive layer and the base material surface, and undulations of the base material surface, a gap is created between the adhesive layer and the base material surface. Air remains. Alternatively, by performing the heat treatment, gas is generated when the resin of each layer of the transfer material undergoes a chemical reaction such as crosslinking. These air and gas try to escape to the outside of the transfer layer by heating, but since they cannot be escaped to the outside of the transfer layer by being blocked by the metal thin film having poor gas permeability, air or gas accumulates and becomes a large number of bubbles. It becomes suitable to lift the metal thin film layer, and as a result, it develops up to the surface of the peeling layer having the metal thin film and fine projections are formed, the smoothness is impaired, and the metallic luster pattern is ruined. Therefore, the present inventors have proposed a transfer material that exhibits a metallic luster that does not cause a fine convex portion due to bubbles to appear on the surface thereof even if heat treatment is applied, and does not impair a beautiful metallic luster design; By heat-treating the base material to which the transfer layer is transferred, fine convex parts do not appear, and the base material has a metallic luster with enhanced surface strength and resistance such as adhesion to the base material. It was an object of the present invention to obtain a manufacturing method for obtaining.

[Means for Solving the Problems]

The present invention is configured as follows in order to achieve the above object. That is, a transfer material exhibiting a metallic luster characterized in that a transfer layer in which a release layer, a metal thin film layer having a minute gap, and an adhesive layer are sequentially laminated is provided on a base sheet, and a transfer sheet on the base sheet. In addition, the transfer layer of the transfer material provided with the transfer layer in which the release layer, the metal thin film layer having a minute gap, and the adhesive layer are sequentially laminated is transferred to the surface of the base material, and then subjected to heat treatment to obtain a metallic luster. The method for producing a base material having The present invention will be described in more detail with reference to the drawings. FIG. 1 is a cross-sectional view of one step of the method for producing a base material having metallic luster of the present invention. First, a transfer material for forming a design on the base material 5 by the transfer method is a base sheet 1 on which a transfer layer 6 is laminated. The base sheet 1 supports the transfer layer 6 from the release layer 2 side and is removed from the release layer 2 at the same time as or after being transferred to the base material 5, and is made of polyester / vinyl chloride / polypropylene. It is possible to use a plastic film such as or a material obtained by laminating paper to them, or a material having a certain degree of heat resistance such as various composite paper, but a polyester film is suitable as a material that can be obtained at low cost and is easy to process. ing. On the base sheet 1, a transfer layer 6 in which a peeling layer 2, a metal thin film layer 3 having a minute gap, and an adhesive layer 4 are sequentially laminated is formed. The peeling layer 2 is for facilitating the peeling between the base sheet 1 and the transfer layer 6 at the time of transfer, and when a resin having good gas permeability such as an acrylic resin, a rubber resin, an olefin resin is used. Good. As the forming means, a usual coating method or printing method may be used, and generally, a gravure printing method is suitable and is formed on the entire surface of the base sheet 1. Next, if necessary, a printed pattern layer is formed on the release layer 2. The print pattern layer is formed to have a beautiful design, and a desired pattern such as a picture or a character is formed by a method such as a gravure printing method, a screen printing method, or a flexo printing method. The printed pattern layer may be formed of an ink having a binder that is a resin that has good adhesiveness to the base material 5 and the metal thin film layer 3 and does not deteriorate gas permeability. For example, a relatively thermally stable resin such as polyester resin, vinyl chloride resin, acrylic resin, urethane resin, or chlorinated polypropylene resin is used as a binder, and a pigment for coloring is added to this. The obtained ink is used as ink. A metal thin film layer in a crystalline state having a metallic luster and a minute gap at an appropriate position such as the release layer 2 on which a print pattern layer is formed as necessary or the print pattern layer provided as described above. 3 is provided. Using one or more metals selected from the group consisting of nickel, chromium, tin, indium, aluminum, etc. as the vapor deposition material, and using a vacuum vapor deposition method, sputtering method, ion plating method, etc., in a desired pattern It is formed. The feature of the metal thin film layer 3 is that the fine structure of the thin film is in a crystalline state having a minute gap. Specifically, the crystal size is 200-1000Å and the gap is 100-5000.
Å is preferred. The order of laminating the metal thin film layer 3 and the printed pattern layer can be appropriately changed or combined to form a desired design. Further on this, as a layer for adhering to the substrate 5,
An adhesive layer 4 is provided. The adhesive layer 4 is for ensuring the close contact between the base material 5 and the transfer layer 6, and is made of a resin having a good gas permeability such as an acrylic resin, a rubber resin, or an olefin resin. The metal thin film layer 3 is preferably formed on the entire surface of the base sheet 1 or partially as necessary. As a forming means, an ordinary coating method or printing method may be used, and a gravure printing method is generally suitable. Further, a front anchor layer and a rear anchor layer may be formed above and below the metal thin film layer 3 in order to increase the adhesion between the metal thin film layer 3 and a layer directly in contact with the metal thin film layer 3. All are formed by methods such as gravure printing, screen printing, and flexographic printing. For this anchor layer, it is advisable to use an ink such as acrylic resin, vinyl chloride resin, urethane resin, etc., which does not have a bad gas permeability. When a base material having a metallic luster is obtained using the transfer material having the above-described structure, the transfer layer surface of the transfer material is superposed on the base material 5 which is the transfer target, and heat and pressure are applied to form the adhesive layer on the base material 5.
The base sheet 1 is fixed to the surface, and then the base sheet 1 is peeled from the peeling layer 2. At this time, in order to improve the adhesiveness, the base material 5 may be coated with a resin or the like. Next, heat treatment is performed in a heating furnace in order to increase the surface strength of the transfer layer 6 and the adhesive force with the base material 5. The temperature at this time is preferably 100 to 250 ° C. The base material 5 can withstand heating at the above temperature, and for example, a material made of metal, glass, engineering plastic, or the like can be used.

[Action]

When the transfer layer 6 is heated after being transferred onto the surface of the base material 5 using the above-mentioned transfer material, first, the polymer substance forming the peeling layer 2 or the adhesive layer 4 on the surface accelerates the reaction to cause cross-linking, thereby forming a network structure. Becomes Therefore, the hardness of the resin of the peeling layer 2 of the transfer layer 6 is strengthened, and the fixing force of the resin of the adhesive layer 4 is improved. Then, the transfer method at the time of transfer, the dust entering between the adhesive layer 4 and the surface of the base material 1, the unevenness of the surface of the base material 5, etc. The air remaining in the gaps or the gas generated from each layer by the chemical reaction is allowed to escape upward by heating. In the case of the present invention, since the metal thin film layer 3 has a crystal structure having a minute gap sufficient for gas molecules to pass through, the gas molecules are not trapped in the metal thin film layer 3 and bubbles are not generated. Therefore, since no fine protrusions are generated on the surface, it remains a smooth surface, does not ruin the metallic luster pattern, and has a metallic luster with enhanced resistance to adhesion to the substrate and surface strength. A substrate having is obtained.

【The invention's effect】

According to the transfer material of the present invention, the transfer material that exhibits a metallic luster uses a metal thin film layer in a crystalline state having a minute gap. The air remaining in the resin layer of the transfer layer or the chemically generated gas permeates the metal thin film layer, and therefore fine protrusions due to air bubbles do not appear on the surface of the metal thin film layer portion of the substrate surface. As a result, it is possible to obtain a base material having an excellent design property, which does not impair the beautiful metallic luster pattern. Further, according to the production method of the present invention, the transfer layer of the transfer material is transferred to the surface of the base material, and the heat treatment is performed, so that the surface release layer
Alternatively, the polymer material forming the adhesive layer is accelerated in the reaction and cross-linked to form a network structure, which improves resistance such as surface strength and adhesion to the base material, and the air remaining in the resin layer of the transfer layer or chemically. Since the generated gas passes through the metal thin film, fine protrusions due to bubbles do not occur on the release layer surface of the metal thin film portion on the surface of the base material. Therefore, it becomes possible to manufacture a base material that satisfies both the required durability and design expression.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of one step of the method for producing a base material having metallic luster of the present invention. FIG. 2 is a schematic enlarged cross-sectional view in which a convex portion is generated on the surface of a base material having a metallic luster made of a conventional transfer material by heat treatment. 1 ... Substrate sheet, 2 ... Release layer, 3 ... Metal thin film layer,
4 ... Adhesive layer, 5 ... Substrate, 6 ... Transfer layer.

Claims (2)

[Claims] 1. A transfer material exhibiting a metallic luster, characterized in that a transfer layer in which a release layer, a metal thin film layer having a minute gap, and an adhesive layer are sequentially laminated is provided on a base sheet. 2. A transfer material comprising a transfer layer comprising a release layer, a metal thin film layer having a minute gap, and an adhesive layer, which are sequentially laminated on a base sheet, and the transfer layer is transferred onto the surface of a base material. The method for producing a base material having a metallic luster, which is characterized by comprising heat treatment.