JPH0242360B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a transfer material for simultaneous injection molding and painting. More specifically, the injection molding simultaneous decoration transfer material according to the present invention can be used to apply decorations at the same time as injection molding to raised plastic molded products used in cosmetic containers (e.g., compact containers), home appliances (e.g., calculator frames), etc. The present invention relates to a transfer material that can perform the following steps. [Prior Art and its Problems] Conventionally, as a transfer material for simultaneous injection molding and painting, a material is known in which a transfer layer consisting of a release layer, a colored layer, an adhesive layer, etc. is sequentially laminated on a base film.
When this transfer material is used to decorate at the same time as injection molding, there is no problem if the transfer surface is flat. However, when the transfer surface is three-dimensional and has a rise, for example, if the transfer object is a box-like object such as the compact container or calculator frame mentioned above, the transfer surface extends not only to the top surface of the outer circumference but also to the side surface. sometimes,
I had the following problem: Since the simultaneous injection molding and painting transfer material is injection molded with its periphery clamped, it is stretched along the female mold formation by the heat and pressure of the molding resin. In this case, with respect to the box-shaped object, its elongation is particularly large in the areas where the top surface and the side surfaces are adjacent to each other, or in the areas centered around the corner areas at the four corners.
As a result, the thickness of each layer constituting the transfer layer becomes thinner, and its function deteriorates. For example, if the release layer becomes thinner, there has been a problem in that various points such as surface abrasion resistance, water resistance, and light resistance in that part deteriorate significantly. Furthermore, if the colored layer becomes thinner, the color density becomes lower, so that the color of the molded resin becomes visible and the light resistance deteriorates. Furthermore, if the adhesive layer becomes thinner, there is a problem that the adhesive strength decreases. This phenomenon becomes more noticeable as the plastic molded product rises more and the transfer material is stretched to a greater degree. If the degree of damage further increases, each layer constituting the transfer layer will crack, resulting in an extremely unsightly appearance and no commercial value. One possible way to solve the above problem is to increase the thickness of all or part of the transfer layer as a whole. But in this case,
This causes defects such as poor foil cutting and foil burrs, making it difficult to obtain beautiful plastic molded products. Furthermore, although it is possible to remove the defective foil pieces after molding, there is a problem in that this requires time and effort and the workability is poor. [Means for Solving the Problems] As a result of various studies in view of the problems of the conventional injection molding simultaneous painting transfer material described above, the present inventor has developed a plastic molded product with a rise that does not have the problems described above. This resulted in the creation of a transfer material with simultaneous injection molding and painting. That is, the transfer material for simultaneous injection molding and painting on plastic molded products with rising edges according to the present invention has a release layer 2, a colored layer 3, and an adhesive layer 4 on a base film 1.
In a transfer material on which a transfer layer T is formed, a pattern corresponding to the stretched portion with the same or similar composition as each layer constituting the transfer layer T is applied to the stretched portion stretched during injection molding. The present invention is characterized in that at least one additional layer A is provided, and the additional layer A is provided adjacent to a transfer layer having the same or similar composition. The basic layer structure of the transfer material in the present invention is the same as that of general transfer materials. For example, a transfer material can be provided in which a release layer 2 is provided on a base sheet 1, a colored layer 3 is provided on top of the release layer 2, and an adhesive layer 4 is further provided on top of the release layer 2. Further, in this case, the transfer material may have a structure in which the peeling layer 2 and the adhesive layer 4 are omitted by providing the colored layer 3 with a peeling function or an adhesive function. A feature of the present invention is that an additional layer A is provided in this transfer material. First, this additional layer A is provided on the stretchable part that is stretched during injection molding. For example, if the target plastic molded product is a box-shaped item, an elongated portion will occur in the area adjacent to the top and side surfaces or in the area centered around the four corners.
As shown in the figure, band-shaped additional layers A may be formed on both sides of the adjoining line 5 between the top and side surfaces. Second, one or more additional layers A are laminated adjacent to the layers constituting the transfer layer T. The additional layer A is intended to compensate for the functional deterioration of the layers constituting the transfer layer T that occurs when the transfer material is stretched during injection molding, so one layer or multiple layers may be added depending on the need for compensation. It is formed. For example, if you want to compensate for the surface abrasion resistance, water resistance, light resistance, etc. caused by stretching the release layer 2, an additional layer 2-A of the release layer may be formed on or below the release layer 2. Bye. In addition, when the rise is large (including both cases where the rise angle is large and the rise height is high), there is a difference between a flat area where the transfer material has little elongation and a corner area where the transfer material has a large elongation. In such a case, as shown in FIGS. 1 and 2, multiple additional layers A are provided adjacent to each layer constituting the transfer layer T so that the thickness is uniform around the molded product 6 after transfer. It is desirable to do so.
In the figure, 3-A indicates an additional layer of a colored layer, and 4-A indicates an additional layer of an adhesive layer. Thirdly, the additional layer A has a composition that is the same as or similar to that of the layer constituting the adjacent transfer layer T. For example, the additional layer 2-A of the release layer provided above or below the release layer 2 has a composition that is the same as or similar to that of the release layer 2. This is because the additional layer 2-A of the release layer is intended to compensate for the release layer 2 whose function has deteriorated. The additional layer 2-A of the release layer described above is preferably composed of a composition containing an elastic resin such as a styrene resin, a polyester resin, a rubber resin, a urethane resin, or a vinyl resin. This is because the high extensibility of these resins can be utilized. Since the transfer material used in the present invention is a transfer material that can be decorated at the same time as injection molding, the base film 1 used therein is required to have heat resistance. Therefore, for example, polyester film, nylon film, polypropylene film, etc. can be used. In addition, a peeling layer 2 and a colored layer 3 constituting the transfer layer T
The adhesive layer 4 and the like may be formed using materials commonly used for injection molding and simultaneous painting transfer materials. However, as for the release layer 2, it is preferable to form it from an elastic material whose main component is, for example, styrene resin, polyester resin, rubber resin, or urethane resin. The colored layer 3 is preferably formed using an ink made by mixing a coloring agent into a resin as a main component, for example, a polyester elastomer, a urethane elastomer, a styrene elastomer, a vinyl elastomer, a rubber elastomer, or a polyamide elastomer. Furthermore, the adhesive layer 4 may be selected in consideration of its adhesion to the molded product, and may be selected from elastic materials such as polyolefin resin, vinyl resin, acrylic resin, polyamide resin, polyester resin, and rubber resin. A composition consisting of one or more types of resins can be mentioned. As mentioned above,
The reason why elastic resin is used for the release layer 2, the colored layer 3, and the adhesive layer 4 is to give these transfer layers T extensibility. Various designs can be considered for the colored layer 3. It may be a full-surface solid pattern or a patterned pattern, and it does not matter whether or not these patterns have the ability to hide the colored components. Furthermore, the pattern may be combined with a vapor deposited layer. If carbon or silver paste is used as the coloring component in the colored layer 3, it is possible to make a molded product having a conductive film with a constant resistance value around the entire circumference of the molded product. It is also possible to obtain a foundation. The layers such as the release layer 2, the colored layer 3, and the adhesive layer 4 constituting the transfer layer T may be formed by ordinary printing methods such as gravure printing, offset printing, and screen printing. Example 1 Thickness was determined by gravure printing on polypropylene film using ink made of polyurethane resin.
A 1μ release layer was provided. An additional layer of a release layer having a thickness of 1 μm and consisting of an ink having the same composition as the release layer and having a pattern corresponding to the extension part was provided by gravure printing on the extension part that was stretched when injection molding was performed thereon. . On top of that, a colored layer with a thickness of 4 μm was provided by screen printing using ink containing polyamide resin as a base and phthalocyanine blue pigment dispersed therein. An additional layer of a colored layer with a thickness of 4 μm consisting of an ink having the same composition as the colored layer and a pattern corresponding to the stretched part was provided by screen printing on the stretched part that was stretched during injection molding. . Furthermore, the thickness is determined by screen printing using ink made of acrylic resin.
A 3μ adhesive layer was provided. An additional layer of an adhesive layer having a thickness of 3 μm and consisting of an ink having the same composition as the colored layer and a pattern corresponding to the stretched portion was provided by screen printing on the stretched portion that was stretched during injection molding. . Using the thus obtained transfer material, injection molding and simultaneous painting with styrene resin were carried out. The obtained molded product was a compact container measuring 120 mm wide x 80 mm long x 7 mm high, and the transfer layer was transferred to the outer surface of the compact container. Table 1 shows the results of examining the surface abrasion resistance, water resistance, and light resistance of this product. In addition, in the above-mentioned Example 1, the additional layer of the release layer,
Comparative Example 1 shows the results of an experiment conducted in the same manner as in Example 1 except that the additional layer of colored layer and the additional layer of adhesive layer were not provided.
They are also shown in Table 1.

[Table] Example 2 A release layer with a thickness of 1 μm was provided on a polyester film by gravure printing using an ink made of a salt-acetate bimaleic acid resin. On top of that, the thickness is determined by screen printing using ink with phthalocyanine blue pigment dispersed in an acrylic vinyl resin base.
A 4μ colored layer was provided. An additional layer of a colored layer with a thickness of 4 μm consisting of an ink having the same composition as the colored layer and a pattern corresponding to the stretched part was provided by screen printing on the stretched part that was stretched during injection molding. . Furthermore, an adhesive layer with a thickness of 3 μm was provided thereon by screen printing using ink made of acrylic resin. Using the thus obtained transfer material, injection molding and simultaneous painting with ABS resin were carried out. The obtained molded product was a compact container measuring 120 mm in width x 80 mm in length x 7 mm in height, and the transfer layer was transferred to the entire outer surface of the container. Table 2 shows the results of examining the surface abrasion resistance, water resistance, and light resistance of this product. The results of an experiment conducted in the same manner as in Example 2 except that the additional colored layer was not provided are also shown in Table 2 as Comparative Example 2.

[Effects of the present invention]

Since the present invention has the above configuration, it has the following effects. That is, since the additional layer is provided at the stretching portion where the transfer material is stretched along the mold shape during molding, the additional layer compensates for the functional decline of the transfer layer. Therefore, there is no problem that the peeling layer becomes thin and the surface abrasion resistance, water resistance, light resistance, etc. in that part deteriorate significantly. Also,
In the colored layer, the color density does not become thinner or the light resistance deteriorates. Furthermore, the adhesive layer does not become thinner and the adhesive strength does not decrease. Moreover, the additional layer is provided only on the stretched portions of the transfer material that are stretched along the entire mold shape during molding, and is not provided on the portions where defects such as foil breakage occur. There is no risk of any problems occurring. The above effect remains the same even if the plastic molded product rises more and the transfer material is stretched to a greater degree. Therefore, by using the simultaneous injection molding and painting transfer material according to the present invention, it becomes possible to easily obtain beautifully painted plastic molded products.

[Brief explanation of the drawing]

Fig. 1 is an enlarged front cross-sectional view of a main part of an embodiment of the injection molding simultaneous decoration transfer material for a plastic molded product with a raised part according to the present invention, and Fig. 2 is an enlarged front sectional view of an embodiment of the present invention which has a raised part according to the present invention. FIG. 3 is an enlarged front sectional view of the main part after transfer of the injection molding simultaneous decoration transfer material to a plastic molded product, and FIG. An explanatory perspective view after transfer is shown. In the figure 1...Base film, 2...Peeling layer, 3
... Colored layer, 4 ... Adhesive layer, 5 ... Adjacent line, T ...
...Transfer layer, A...Additional layer, 2-A...Additional layer of peeling layer, 3-A...Additional layer of colored layer, 4-A...Additional layer of adhesive layer.

Claims (1)

[Claims] 1. On the base film 1, a release layer 2, a colored layer 3,
In a transfer material in which a transfer layer T consisting of an adhesive layer 4 etc. is formed; in an elongated portion stretched during injection molding, a layer having the same or similar composition as each layer constituting the transfer layer T and corresponding to the elongated portion is added. Injection molding of a plastic molded product with an upright shape, characterized in that at least one additional layer A is provided with a pattern of Simultaneous painting transfer material. 2. A transfer material for simultaneous injection molding and painting on a raised plastic molded article according to claim 1, wherein the additional layer A contains an elastic resin.