JPS6295300A - Injection molding simultaneous painting transfer material toplastic molded shape having rise - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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.

[Conventional technology and its problems]

BACKGROUND ART Conventionally, as a transfer material for simultaneous injection molding and painting, a material is known in which a transfer layer consisting of a peelable layer, a colored layer, an adhesive layer, etc. is sequentially laminated on a base film.

When painting is done at the same time as injection molding using this transfer material,
There is no problem when the transfer surface is flat.

However, when the transfer surface becomes three-dimensional and has a rise,
For example, when the transferred object is a box-shaped object such as the above-mentioned compact container or the frame of a calculator, and the transferred surface extends not only to the top surface but also to the side surfaces of the outer peripheral surface, the following problems occur.

Since the simultaneous injection molding transfer material is injection molded with its periphery clamped, it is stretched along the shape of the female mold by the heat and pressure of the molding resin. In this case, with respect to the box-shaped object, its elongation becomes particularly large in the area adjacent to the top and side surfaces or in the area centered around a part of 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 is a problem in that various points such as surface abrasion resistance, water resistance, light resistance, etc. in that part deteriorate significantly.

Furthermore, if the colored layer becomes thinner, the coloring density becomes thinner, 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.

Such a phenomenon becomes more noticeable as the rise of the plastic molded product increases and the extent to which the transfer material is stretched increases. 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. However, in this case, the foil does not cut well and the foil burrs occur, 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 to solve problems]

As a result of various studies in view of the problems of the conventional injection molding simultaneous decoration transfer material described above, the present inventor has developed a injection molding simultaneous decoration transfer material for plastic molded products with a rise that does not have the above-mentioned problems. It was completed in getting it.

That is, the transfer material for simultaneous injection molding and painting on a plastic molded product with rising edges according to the present invention has a peeling layer 22, a colored layer 3, on a base film 1. In a transfer material in which a transfer layer T consisting of an adhesive layer 4 etc. is formed; in an elongated portion that is elongated during injection molding, a layer having the same or approximate composition as each layer constituting the transfer layer T and corresponding to the elongated portion is added. The present invention is characterized in that at least one additional layer A is provided having a pattern of 1, 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 peeling layer 1fifi layer 2 is provided on the base sheet 1, a colored layer 3 is provided thereon,
Further, a transfer material having an adhesive layer 4 provided thereon can be prepared. Furthermore, in this case, the transfer material may have a structure in which the release layer 2 and the adhesive layer 4 are omitted by providing the colored layer 3 with a release 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
It is provided on the stretchable part that is stretched during injection molding. For example, when the target plastic molded product is a box-shaped object, an elongated portion occurs in the adjacent portion between the top and side surfaces or in the portion centered on a portion of the four corners, as shown in Fig. 3. It is preferable to form the band-shaped additional layer A on both sides of the adjoining line 5 between the top surface and the side surface.

Second, one or more additional layers A are laminated adjacent to the layers constituting the transfer [T]. The additional layer A is to compensate for the functional deterioration of the layer constituting the transfer layer T that occurs when the transfer material is stretched during injection molding, so one layer or multiple layers may be formed depending on the need for compensation. Ru. For example, surface abrasion resistance caused by stretching the release layer 2,
water resistance.

If light resistance or the like is to be improved, an additional release layer 2-A may be formed on or below the release layer 2.

In addition, the rise is large (including both cases where the rise angle is large and the rise height is high), and there is a difference between a flat part where there is almost no elongation of the transfer material and a part of the corner where the elongation of the transfer material is large. If this occurs, it is desirable to have a thickness as shown in FIGS. 1 and 2. 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,
M+J provided above or below the release layer 2? The four additional layers 2-A have the same or similar composition to that of the release layer 2. This is because the additional layer 2-A of the release layer is
This is because it 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 made of elastic resin such as styrene resin, polyester resin,
It is preferable to use a composition containing a comb resin, a urethane resin, and a vinyl resin.

This is because the high extensibility of these resins can be utilized.

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 for this is required to have heat resistance. Therefore, for example, polyester film, nylon film, polypropylene film, etc. can be used.

Further, the release layer 21, colored layer 3, adhesive layer 4, etc. that constitute the transfer layer T may be formed using those commonly used for injection molding and simultaneous painting transfer materials. However, regarding the release layer 2, for example, styrene resin, polyester resin,
It is preferable to use an elastic material containing a rubber resin or a urethane resin as a main component. colored layer 3
It is desirable to form the ink 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 adhesion to the molded product, and may be selected from polyolefin resins, vinyl resins, acrylic resins, and polyamide resins.

Examples include compositions made of one or more elastic resins such as polyester resins and rubber resins. As mentioned above, the reason why elastic resin is used for the release layer 2, the colored layer 3, and the adhesive layer 3 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 thin 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.

In addition, each layer such as the release layer 25, colored layer 3, and adhesive layer 4 constituting the transfer layer T may be formed by a normal printing method such as gravure printing, offset printing, or screen printing.

[Example 1] A release layer having a thickness of 1 μm was provided on a polypropylene film by gravure printing using an ink made of polyurethane resin. 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 stretch portion was provided by gravure printing on the stretch portion that was stretched during injection molding. . A colored layer having a thickness of 4 μm was formed thereon by screen printing using an ink having a polyamide resin base and a 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 when injection molding was carried out on it. . Furthermore, an adhesive layer having a thickness of 3 μm was provided thereon by screen printing using ink made of acrylic resin. An additional layer of an adhesive layer having a thickness of 3μ and consisting of an ink having the same composition as the adhesive layer and having a pattern corresponding to the stretching part was provided by screen printing on the stretched part that was stretched when injection molding was carried out on it. .

Using the thus obtained transfer material, simultaneous injection molding with styrene resin was carried out. The obtained molded product has a width of 12
(It is a compact container with the size of hm x length 80 dragon x height 7 fin, and the transfer layer was transferred to the entire outer surface.The results of investigating the surface abrasion resistance, water resistance, and light resistance of this container. It is shown in Table 1.

In addition, in the above-mentioned Example 1,! ! ′, an additional layer of II# layer.

The results of an experiment conducted in the same manner as in Example 1 except that the additional layer of the colored layer and the additional layer of the adhesive layer were not provided are also shown in Table 1 as Comparative Example 1.

Table 1 Note) Test method: - Surface abrasion resistance: The value when the surface gloss changed was read using an RCA abrasion machine (load: 275g, tape NQ61001).

・Water resistance: After immersing the transfer layer in warm water maintained at 40 ± 3°C for 48 hours and observing whether there are any abnormalities in the transfer layer, apply Nichiban sellotape (18 width) to the surface of the A-layer and the edges. 1
The print was peeled off by rapidly pulling it in the opposite direction at 80°C, and the presence or absence of peeling of the print was examined.

Light resistance: Exposure was performed for 100 hours using a carbon arc fed meter, and abnormalities in the transfer layer were observed.

[Example 2] A release layer having 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. A colored layer having a thickness of 4 μm was formed thereon by screen printing using an ink containing an acrylic vinyl resin base and a phthalocyan 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 when injection molding was carried out on it. . Furthermore, an adhesive layer having 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 with a size of 120 mm width x 80 mm length x 7 mm 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.

Table 2 [Effects of the 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.

Further, in the colored layer, the color density does not become thinner, and the light resistance does not deteriorate. Furthermore, the adhesive layer does not become thinner and the adhesive strength does not decrease.

Furthermore, the additional layer is provided only on the stretched portions of the transfer material that are stretched along the 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 injection molding simultaneous decoration transfer material according to the present invention, it becomes possible to easily obtain beautifully decorated plastic molded products.

[Brief explanation of drawings]

Fig. 1 is an enlarged front cross-sectional view of a main part of an embodiment of the transfer material for simultaneous injection molding and painting on a plastic molded product with a rise according to the present invention, and Fig. 2 is an enlarged front sectional view of the main part of an embodiment of the transfer material for simultaneous injection molding and painting on a plastic molded product with a rise 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 - release layer, 3
- Colored layer, 4 - Adhesive layer, 5 - Adjacent line, T - Transfer layer. A--additional layer, 2-A...additional layer of release layer, 3-A-
Additional layer of colored layer, 4-A-Additional layer of adhesive layer.

Claims (2)

[Claims] (1) In a transfer material in which a transfer layer T consisting of a release layer 2, a colored layer 3, an adhesive layer 4, etc. is formed on a base film 1; At least one additional layer A having the same or similar composition as each layer constituting the layer and having a pattern corresponding to the stretched portion is provided, and the additional layer A is provided adjacent to a transfer layer having the same or similar composition. A transfer material for simultaneous injection molding and painting on plastic molded products with a distinctive feature: (2) A transfer material for simultaneous injection molding and painting on a raised plastic molded product according to claim 1, wherein the additional layer A contains an elastic resin.