JP2630715B2 - Partially matte transfer sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a partially matte transfer sheet for partially matting the surface of a plastic molded product.

[0002]

2. Description of the Related Art A transfer sheet is used as one of means for decorating the surface of a molded article such as plastic.
The transfer sheet is formed by forming a release layer, a design layer, an adhesive layer, and the like on a base sheet such as a plastic film. In particular, when manufacturing molded products by injection molding method,
By inserting the transfer sheet into the mold, the surface of the molded article can be decorated simultaneously with the formation of the molded article. In addition, the surface of the molded article can be decorated by bringing the transfer sheet into close contact with the molded article already molded. The decoration with the transfer sheet does not use a solvent unlike printing and painting, and thus has advantages such as not requiring a drying step and not contaminating the working environment.

As a transfer sheet, there is a partial matte transfer sheet 10 in which at least a release layer 4 and an adhesive layer 6 are formed on a base sheet 1 partially having a matte layer 2 (see FIG. 8). When a partially matte transfer sheet is used, the surface of the plastic molded article can be partially matted. The case where the surface of the molded article is decorated simultaneously with the formation of the molded article by the injection molding method using the partially matte transfer sheet will be described.
The partial matte transfer sheet is inserted into a mold for injection molding so that the adhesive layer comes into contact with the molten resin, and the resin is injected, so that the partial matte transfer sheet is brought into close contact with the surface of the molded article. When the base sheet of the partial matte transfer sheet is peeled, peeling occurs at the interface between the base sheet of the partial matte transfer sheet and the release layer, and the matte layer is removed together with the base sheet. The unevenness of the matte layer is photographed on the surface of the molded article, and an arbitrary part of the surface of the molded article is brought into a matte state.

[0004]

In this case, the release layer serves as the surface of the molded article, and this surface requires some strength. In particular, the matte portion is made of fine irregularities, so that it is easily damaged by scratching, and needs to have strength against scratching. However, in the partial matte transfer sheet, the resin constituting the release layer is a thermoplastic resin or a thermosetting resin,
In particular, the scratch resistance was not high.

Further, as a transfer sheet having a high surface strength, there is a transfer sheet using an ultraviolet curable resin or an electron beam curable resin for a release layer. Since these resins have high hardness, the resistance to scratching can be improved. But,
It has the property that it is easily broken due to its high hardness. Therefore, when a partially matte transfer sheet using an ultraviolet curable resin or the like for the release layer is inserted into the mold and the resin is injected, the partial matte transfer sheet is peeled off when it is deformed along the cavity surface of the mold. The layer may crack. In addition, a step of irradiating an ultraviolet ray or an electron beam is required. Accordingly, an object of the present invention is to provide a partially matte transfer sheet which has solved the above-mentioned disadvantages.

[0006]

In order to achieve the above object, the present invention provides a partially matte transfer sheet in which at least a release layer and an adhesive layer are formed on a base sheet partially having a matte layer. The ratio of the wax in the release layer located in the portion overlapping the matte layer is higher than the ratio of the wax in the release layer located in the portion not overlapping the matte layer. In the above configuration,
The wax layer may have a wax content of 5 to 25% by weight in a release layer located at a portion overlapping with the matte layer.

The present invention will be described in more detail with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the partial matte transfer sheet of the present invention. FIG. 2 is a sectional view showing another embodiment of the partial matte transfer sheet of the present invention. FIG.
FIG. 4 is a sectional view showing another embodiment of the partially matte transfer sheet of the present invention. 4 and 5 are cross-sectional views showing one embodiment in which molding is performed using the partially matte transfer sheet of the present invention. FIG. 6 is a sectional view showing a state in which the base sheet of the partial matte transfer sheet of the present invention is peeled off. FIG. 7 is a perspective view showing an embodiment in which decoration is performed using the partially matte transfer sheet of the present invention. FIG. 8 is a sectional view showing a conventional partial matte transfer sheet. 1 is a base sheet, 2 is a matte layer,
Reference numeral 3 denotes a matte release layer, 4 denotes a matte release layer, 5 denotes a pattern layer, 6 denotes an adhesive layer, 7 denotes a molded product, 8 denotes a mold, 9 denotes a cavity, and 10 denotes a partially matte transfer sheet.

As the base sheet 1, a plastic film or paper such as polyethylene terephthalate, polypropylene, polyethylene, nylon, cellophane or the like, or a composite film thereof, which is used as the base sheet 1 of an ordinary transfer sheet is used. The surface of the base sheet 1 may be subjected to a release treatment.

The matte layer 2 is formed partially on the base sheet 1. The matting layer 2 is provided, for example, by coating a resin containing an extender such as silica or calcium carbonate, a fine powder having a fine particle diameter such as polyethylene wax or glass beads by a printing method or the like.

The release layer comprises a matte release layer 3 located at a portion overlapping the matte layer 2 and a gloss release layer 4 located at a portion not overlapping the matte layer 2. The matte release layer 3 is formed on the matte layer 2. The gloss release layer 4 is formed on the base sheet 1. The matte peeling layer 3 and the matte peeling layer 4 are layers that peel off from the base sheet 1 after transfer and become the surface of the molded article 7. The matte release layer 3 and the gloss release layer 4 are made of a thermoplastic resin such as an acrylic resin or a vinyl resin, or a thermosetting resin such as a urethane resin or an epoxy resin.
It is good to use what added wax. As the wax, polyethylene wax, polypropylene wax, or the like is used. The matte release layer 3 has a higher wax content than the matte release layer 4. The wax content in the matte release layer 3 is
5 to 25% by weight is preferred. The portion where the gloss release layer 4 is formed becomes a gloss portion. If the wax content of the release layer in the glossy portion is too large, the release layer becomes dull and cloudy.
Therefore, the wax content of the gloss release layer 4 is preferably 1 to 10% by weight. The matte release layer 3 and the matte release layer 4 may be formed by a normal printing method such as a gravure printing method or a screen printing method. The matte release layer 3 is formed in register with the matte layer 2. The gloss release layer 4 may be formed entirely (see FIG. 1), or may be formed in register with a portion where the matte layer 2 is not provided (see FIG. 2).

The adhesive layer 6 is for bonding the above-mentioned layers to the molded article 7. The adhesive layer 6 is entirely formed on the release layer. As the adhesive layer 6, a heat-sensitive or pressure-sensitive resin suitable for a surface material such as a plastic molded product as the molded product 7 is appropriately used. For example, if the molded product 7 is AS
In the case of a resin, it is preferable to use an acrylic resin or a vinyl chloride-vinyl acetate resin, and in the case of a polypropylene, it is preferable to use a chlorinated polypropylene resin or an ethylene vinyl acetate resin.

Note that the above configuration shows one embodiment of the present invention, and the present invention is not limited to this. For example, the design layer 5 may be formed between the gloss release layer 4 and the adhesive layer 6 (see FIG. 3). If the pattern layer 5 is formed between the gloss release layer 4 and the adhesive layer 6,
The surface of the molded article 7 is matted and glossy, and at the same time, the molded article 7
A pattern can be formed on the surface. The pattern layer 5 is formed by a normal printing method such as a gravure printing method or a screen printing method using a coloring ink including a normal pigment or dye, a binder, an additive and the like. It is preferable to use a coloring ink which has excellent adhesion to the release layer and excellent weather resistance. The design layer 5 may be a single layer or a multi-layer structure having multiple colors. The design layer 5 may be a metal thin film layer of aluminum, nickel, or the like formed by a vacuum evaporation method, a sputtering method, an ion plating method, or the like.

The surface of the molded article 7 can be decorated using the partial matte transfer sheet 10 thus configured. Next, an example of a method for forming the molded article 7 using the partial matte transfer sheet 10 will be described. The mold for injection molding includes a movable mold and a fixed mold (see FIG. 4), and the cavity 9 is formed by closing both molds (see FIG. 5).

First, the partially matte transfer sheet 10 is fixed in a mold. At this time, it is preferable to use a film feeder (not shown) having a positioning mechanism so that the register of the pattern of the partial matte transfer sheet 10 and the mold coincide.

Next, the mold is closed (see FIG. 5) and molten resin is injected into the cavity 9 from the gate provided on the fixed mold to form the molded product 7 and, at the same time, form a partially matte surface on the surface of the molded product 7. The transfer layer of the transfer sheet 10 is bonded. After cooling of the molded article, the mold is opened, the molded article is taken out, and the base sheet 1 of the partial matte transfer sheet 10 is peeled off (see FIG. 6), and the molded article 7 having the glossy part and the matte part is obtained. (See FIG. 7).

Further, the surface of the molded article 7 can be decorated as follows. First, the adhesive layer 6 side of the partially matte transfer sheet 10 is brought into close contact with the molded article 7, and heated and pressed by a heating pad. Next, when the base sheet 1 is peeled off, the matte layer 2
Peeling occurs at the interface between the matte release layer 3 and the matte release layer 3, and peeling occurs at the interface between the base sheet 1 and the matte release layer 4. In this way, a matte portion and a glossy portion can be formed.

[0017]

According to the partial matte transfer sheet of the present invention, a matte release layer is formed on a substrate sheet partially having a matte layer, and a matte release layer is formed on a portion overlapping the matte layer, and a glossy portion is formed on a portion not overlapping with the matte layer. A release layer is formed, and an adhesive layer is further formed on the entire surface, so that the ratio of wax in the matte release layer is higher than the ratio of wax in the glossy release layer.

In order to use the partially matte transfer sheet of the present invention, the partially matte transfer sheet may be brought into close contact with a molded article already formed, or a molded article is formed in an injection mold. At the same time, the partially matte transfer sheet may be brought into close contact with the molded product by the heat and pressure of the molten resin.

Next, when the base sheet is peeled off, peeling occurs at the interface between the matte layer and the matte release layer, and peeling occurs at the interface between the base sheet and the matte release layer. The fine unevenness of the matte layer is transferred to the matte release layer, and a matte portion is formed.
The matte release layer has a high wax content, so that its surface becomes cloudy, but is inconspicuous because it is a matte part. Therefore, when the matte layer is removed together with the base sheet, the surface of the molded article becomes a matte part by the matte layer and a matte part by the base sheet.

[0020]

EXAMPLE As a substrate sheet, a 38 μm-thick polyester film coated with a mixture of an acrylic resin, a melamine resin, and an epoxy resin was used. A matting layer comprising 40 parts of an aminoalkyd resin, 4 parts of an extender pigment, and 3 parts of an organic acid was partially provided on the base sheet by a gravure printing method.

A matte release layer consisting of 100 parts of acrylic resin and 15 parts of polyethylene wax was provided by gravure printing on the matte layer in register. Also, acrylic resin 100
, A gloss release layer consisting of 3 parts of polyethylene wax was entirely provided by gravure printing. Finally, an adhesive layer consisting of 100 parts of vinyl chloride / vinyl acetate copolymer resin was entirely provided by gravure printing to obtain a partially matte transfer sheet.

This partially matte transfer sheet was sandwiched between injection molding dies, and AS resin was injected at a resin temperature of 220 ° C. and an injection pressure of 60 kg / cm ² to obtain a partially matte molded product.

As a comparative example, a partially matte transfer sheet was obtained in the same manner as described above except that the matte release layer was not provided (see FIG. 8). Using this partially matte transfer sheet, a partially matte molded product was obtained in the same manner as in the example. When the surface hardness of the matte portions of the molded products of the example and the comparative example was measured, they were Example 3H and comparative example H in terms of pencil hardness (load 1 kg).

[0024]

Since the present invention has the above-mentioned structure,
It has the following effects. When the release layer and the adhesive layer are transferred to the surface of the plastic molded article by using the partial matte transfer sheet of the present invention, the ratio of the wax in the release layer located in a portion overlapping the matte layer on the base sheet becomes matte. It is higher than the ratio of the wax in the release layer located in a portion that does not overlap with the layer. Therefore, the matte portion formed on the surface of the plastic molded product is resistant to scratches. Further, since the ultraviolet curable resin or the electron beam curable resin does not need to be used for the release layer, the release layer does not crack even if the partially matte transfer sheet is deformed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a partially matte transfer sheet of the present invention.

FIG. 2 is a sectional view showing another embodiment of the partially matte transfer sheet of the present invention.

FIG. 3 is a sectional view showing another embodiment of the partially matte transfer sheet of the present invention.

FIG. 4 is a cross-sectional view showing one embodiment in which molding is performed using the partially matte transfer sheet of the present invention.

FIG. 5 is a cross-sectional view showing one embodiment in which molding is performed using the partially matte transfer sheet of the present invention.

FIG. 6 is a cross-sectional view showing an example of peeling a base sheet of the partially matte transfer sheet of the present invention.

FIG. 7 is a perspective view showing an embodiment in which decoration is performed using the partially matte transfer sheet of the present invention.

FIG. 8 is a cross-sectional view showing a conventional partial matte transfer sheet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base sheet 2 Matte layer 3 Matte peeling layer 4 Matte peeling layer 5 Pattern layer 6 Adhesive layer 7 Molded product 8 Die 9 Cavity 10 Partial matte transfer sheet

Claims (2)

(57) [Claims] Claims: 1. In a partially matte transfer sheet in which at least a release layer and an adhesive layer are formed on a base sheet partially having a matte layer, the proportion of wax in the release layer located in a portion overlapping the matte layer Wherein the proportion of the wax in the release layer located in a portion that does not overlap with the matte layer is greater than that of the transfer layer. 2. The partially matte transfer sheet according to claim 1, wherein the wax content of the release layer located in a portion overlapping the matte layer is 5 to 25% by weight.