JP2001232660A - Injection molding in-mold decorating sheet and injection molding in-mold decorating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection molding in-mold decorating sheet laminated to a styrenic resin molded article to apply a coating feeling and a pattern to the molded article, excerting no adverse effect on the color development of the pattern even if a rear ABS resin sheet is made black in order to make the cut end surface of the decorating sheet hard to be conspicuous. SOLUTION: The injection molding in-mold decorating sheet S is constituted, for example, by laminating a decorative layer 2 using a mixture of a vinyl chloride/vinyl acetate copolymer and an acrylic resin as a binder resin, an adhesive layer 3 comprising the mixture of the vinyl chloride/vinyl acetate copolymer and the acrylic resin, a color concealing ABS resin sheet 4 containing at least titanium white and a black ABS resin sheet 5 containing at least carbon black on the rear surface of a transparent acrylic resin sheet 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a sheet for simultaneous painting by injection molding and a method for simultaneous painting by injection molding using the same. In particular, the present invention relates to a painting sheet in which a cut end surface is conspicuous and a color of a pattern is good, and a method for simultaneous injection molding and painting using the same.

[0002]

2. Description of the Related Art Conventionally, picture-formed articles obtained by decorating the surface of a resin article have been used for various purposes. For example, in the simultaneous injection molding simultaneous painting method disclosed in Japanese Patent Publication No. 50-19132, Japanese Patent Publication No. 43-27488, etc., after a sheet for simultaneous injection molding painting is disposed between the male and female molds of the injection molding, a molten resin is formed. Discloses a method of molding a resin molded product, solidifying it by injection-filling and simultaneously laminating a sheet for injection-molded painting on the surface of the resin molded product, and obtaining an integrated molded product.

[0003] Further, as an injection molding resin used for a resin molded product, an ABS resin (acrylonitrile resin) is generally used.
Butadiene-styrene copolymer), acrylic resin, polycarbonate resin and the like. For this reason, an ABS resin sheet or the like has been frequently used on the back surface side of the sheet for simultaneous painting with injection molding in consideration of the adhesion to these resins and moldability. On the other hand, when a painted product is required to have a painted feeling, a transparent acrylic resin sheet having excellent transparency and good moldability, weather resistance, scratch resistance and the like has been used on the front side. And in order to give a picture, on top of good moldability,
In many cases, a decorative layer was formed by printing on a vinyl chloride resin sheet having excellent printability.

[0004] In view of the above, as a sheet for simultaneous painting with injection molding, a transparent acrylic resin sheet (front side) / a vinyl chloride resin sheet having a decorative layer printed thereon / AB
An S-resin sheet, a painting sheet having a three-layer resin sheet, and the like have been used. Further, a black ABS resin sheet has been usually used.

[0005]

However, in the case of the three-layer structure as described above, the coating feeling, adhesion, printability and the like are all satisfactory for the time being, but there are the following problems.

(A) Since the vinyl chloride resin is used, it is not environmentally friendly in that hydrogen chloride gas is generated at the time of waste combustion when it becomes unnecessary. In addition, if an attempt is made to make use of the injection molding simultaneous painting sheet of the unnecessary portion trimmed (cut) after the injection molding simultaneous painting as a molding resin by recycling, there is no problem because the acrylic resin and the ABS resin are similar resins. When vinyl chloride resin was mixed, recycling was difficult. In addition, a large amount of a plasticizer is usually mixed into a vinyl chloride resin sheet in order to impart moldability, and after a molded article is formed, the plasticizer bleeds over time, so that it is used for simultaneous painting during injection molding. Adhesion in the sheet layer (between the transparent acrylic resin sheet / vinyl chloride resin sheet and between the vinyl chloride resin sheet / ABS resin sheet) was reduced.

(B) However, the vinyl chloride resin sheet is omitted, and the back side of the transparent acrylic resin sheet and the ABS are removed.
When a decorative layer is printed on the front and side surfaces of the resin sheet and the laminated resin sheet has two layers, the color of the ABS resin sheet on the back side, which is usually black, has an adverse effect on the color development of the picture. This is because the ABS resin sheet on the back side is often black because the cut end face of the sheet for simultaneous painting with injection molding becomes inconspicuous if it is blackened.
Therefore, between the decoration layer and the ABS resin sheet, so that the black color of the ABS resin sheet does not adversely affect the color development by the decoration layer.
This has been dealt with by printing and forming a solid color concealing layer over the entire surface. However, the thickness of the color concealing layer formed by printing or coating is limited, and thus the concealing property is limited.

It is an object of the present invention to provide a laminate type sheet for simultaneous painting with injection molding, which has a coating feeling, is environmentally friendly, makes the cut end face less noticeable, and improves the coloring of the picture. . Another object of the present invention is to provide a simultaneous painting method for injection molding, which can provide a painted molded article having a painted feeling and having a good coloration of an upper pattern in which a cut end surface is not conspicuous.

[0009]

Therefore, in order to solve the above-mentioned problems, a sheet for simultaneous painting with injection molding according to the present invention comprises a laminate type sheet for simultaneous painting with injection molding, wherein a binder is provided on the back side of the transparent acrylic resin sheet. Decorative layer using a mixture of vinyl chloride-vinyl acetate copolymer and acrylic resin as resin, adhesive layer composed of mixture of vinyl chloride-vinyl acetate copolymer and acrylic resin, coloring and hiding including at least titanium white An ABS resin sheet and a black ABS resin sheet containing at least carbon black were laminated in this order.

Alternatively, the sheet for simultaneous painting with injection molding of the present invention is a laminate type sheet for simultaneous painting with injection molding, wherein the positional relationship between the decorative layer and the adhesive layer is reversed. On the back side of the transparent acrylic resin sheet, an adhesive layer composed of a mixture of a vinyl chloride-vinyl acetate copolymer and an acrylic resin, and a mixture of a vinyl chloride-vinyl acetate copolymer and an acrylic resin used as a binder resin. The decorative layer, the colored concealed ABS resin sheet containing at least titanium white, and the black ABS resin sheet containing at least carbon black were laminated in this order.

When the sheet for simultaneous painting with injection molding has any one of the above-mentioned constitutions, first, a vinyl chloride resin sheet is not used, and the sheet is environmentally friendly. Further, a feeling of painting can be imparted by the transparent acrylic resin sheet on the front side. In addition, the black ABS resin sheet on the back side makes the cut end surface black and makes it inconspicuous, and also secures the adhesiveness with a styrene-based injection molding resin such as an ABS resin or an AS resin. Moreover, since a colored concealed ABS resin sheet containing a titanium color is provided between the decorative layer on the lower side of the transparent acrylic resin sheet on the front side and the black ABS resin sheet on the back side, the concealing property can be sufficiently secured. The black color of the black ABS resin sheet on the back side does not adversely affect the coloring of the decorative layer. In addition, the decorative layer is a specific resin, and an adhesive layer of the same specific resin as the specific resin of the decorative layer is provided between the decorative layer and the transparent acrylic resin sheet or between the colored concealed ABS resin sheets. In addition, adhesion between all layers of the sheet for simultaneous painting with injection molding can be ensured. In addition, there are two forms of the position of the adhesive layer. When manufacturing the sheet for simultaneous painting with injection molding, what is selected as a printing object (a transparent acrylic resin sheet or a colored concealed ABS resin sheet) of the decoration layer? Depends on the difference.

Further, as a method for simultaneous painting with injection molding of the present invention, any one of the above sheets for simultaneous painting with injection molding is disposed between a pair of dies, and then both dies are clamped to form the two dies. The resin in a fluidized state is injected into the cavity to be filled, solidified by injection, and simultaneously with the molding of the resin molded article, a molded article with an injection-molded simultaneous painting sheet laminated and integrated on the surface thereof is obtained.

As described above, by performing simultaneous injection molding and painting using any of the above-described sheets for simultaneous injection molding of the present invention, the painting end has a feeling of painting, and the cut end face of the sheet for painting is less noticeable. In addition, it is possible to obtain a molded article having a good color development of the pattern, and it is also possible to make the injection molding simultaneous painting method and the molded article compatible with the environment.

[0014]

Embodiments of the present invention will be described below.

Injection molding simultaneous painting sheet: FIG. 1 is a sectional view showing an embodiment of the injection molding simultaneous painting sheet of the present invention. The sheet S for simultaneous painting with injection molding shown in FIG.
The surface to be the front side is made of a transparent acrylic resin sheet 1,
On its back side, a decorative layer 2 using a mixture of vinyl chloride-vinyl acetate copolymer and acrylic resin as a binder resin, an adhesive layer 3 consisting of a mixture of vinyl chloride-vinyl acetate copolymer and acrylic resin The coloring concealed ABS resin sheet 4 containing at least titanium white and the black ABS resin sheet 5 containing at least carbon black are sequentially laminated sheets for painting. In addition, the sheet S for simultaneous painting with injection molding shown in FIG. 1 (B) is a form in which the vertical relationship between the decorative layer 2 and the adhesive layer 3 is reversed from that in FIG. An adhesive layer 3 made of a mixture of a vinyl chloride-vinyl acetate copolymer and an acrylic resin on the back side thereof, and a vinyl chloride-vinyl acetate copolymer and an acrylic resin And a coloring ABS resin sheet 4 containing at least titanium white, and a black ABS resin sheet 5 containing at least carbon black.

Hereinafter, each layer will be described in detail.

[Transparent Acrylic Resin Sheet] The transparent acrylic resin sheet 1 is a transparent resin sheet made of an acrylic resin. Examples of the acrylic resin include polymethyl (meth) acrylate, polybutyl (meth) acrylate, and methyl (meth) acrylate. ) Acrylic resin such as acrylate-butyl (meth) acrylate copolymer, methyl (meth) acrylate-styrene copolymer [however, (meth) acrylate means acrylate or methacrylate] alone or as a mixture of two or more Used as The excellent transparency of the transparent acrylic resin sheet can impart a high-quality design such as a painted feeling or a surface gloss. Further, there is an advantage that surface properties such as weather resistance and scratch resistance can be improved as compared with the case where a polyolefin resin sheet or the like is used as the transparent resin sheet.

The transparency of the transparent acrylic resin sheet is usually non-colored and transparent, but if necessary, a coloring agent may be appropriately added to the resin to make it colored and transparent. Also,
It may be translucent. In addition, as the coloring agent, known ones as listed in the decorative layer described later can be used.

In the transparent acrylic resin sheet, if necessary, lubricants such as polyethylene wax and paraffin wax, lubricating agents comprising particles such as silica, spherical α-alumina, and flaky α-alumina, Benzotriazole-based, benzophenone-based, fine particle cerium oxide-based ultraviolet absorbers, light stabilizers such as hindered amine radical scavengers, or fillers and stabilizers made of particles such as calcium carbonate, barium sulfate, and aluminum oxide. Various additives may be added for adjusting physical properties. However, it is added within a range where the transparent acrylic resin sheet does not become opaque.

The thickness of the transparent acrylic resin sheet is not particularly limited, but is usually about 50 to 250 μm.

[Decoration Layer] The decoration layer 2 is a layer expressing a pattern or the like by printing or the like, and the decoration layer 2 uses a specific resin as a binder resin. That is, a mixture of a vinyl chloride-vinyl acetate copolymer and an acrylic resin is used as the binder resin. By using such a specific resin, a transparent acrylic resin sheet (or a colored concealed ABS resin sheet (the form of FIG. 1B)) in contact with the decorative layer
And an adhesive layer (using a specific resin corresponding to the binder resin of the decorative layer), and furthermore, a colored concealed ABS resin sheet [or a transparent acrylic resin sheet (FIG. 1 (B)) in contact with the adhesive layer. )]).
That is, the adhesion between the transparent acrylic resin sheet and the colored concealed ABS resin sheet is improved. In addition, the acrylic resin in the resin of the binder contributes to the improvement of the adhesion to the transparent acrylic resin sheet, and the vinyl chloride-vinyl acetate copolymer contributes to the improvement of the printing suitability and the molding suitability.

The vinyl chloride-vinyl acetate copolymer generally has a vinyl acetate content of about 5 to 20% by mass,
Those having an average degree of polymerization of about 350 to 900 are used. Further, the vinyl chloride-vinyl acetate copolymer, if necessary,
Further, those obtained by copolymerizing carboxylic acids such as maleic acid, fumaric acid, and (meth) acrylic acid may be used.

Examples of the acrylic resin include polymethyl (meth) acrylate, polybutyl (meth) acrylate, methyl (meth) acrylate-butyl (meth) acrylate copolymer, and methyl (meth) acrylate-styrene copolymer Such as acrylic resin, or methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, octyl (meth) acrylate, cyclohexyl (meth) acrylate, and 2-hydroxyethyl (meth) acrylate;
An acrylic resin such as an acrylic polyol obtained by copolymerizing a (meth) acrylic acid ester having a hydroxyl group in a molecule such as 2-hydroxy-3-phenoxypropyl (meth) acrylate, alone or as a mixture of two or more kinds. use. When an acrylic polyol is used, crosslinking may be performed by adding an isocyanate such as 2,4-tolylene diisocyanate or 1,6-hexamethylene diisocyanate, if necessary. In addition, (meth) acrylate means acrylate or methacrylate.

The mixing ratio of the vinyl chloride-vinyl acetate copolymer and the acrylic resin is about 1/9 to 9/1 (weight ratio) of the vinyl chloride-vinyl acetate copolymer / acrylic resin.

The resin of the binder for the decorative layer may be, if necessary, any other resin other than the above, for example, a thermoplastic polyester resin, a thermoplastic or two-component curable resin, as a sub-component resin. Resins such as urethane resins may be used in combination.

The decorative layer 2 is basically not particularly limited except that the binder resin is composed of the specific resin. The decorative layer 2 is usually formed of a printing ink or paint by a known printing or coating method (when the coating method is a solid pattern).
Usually, the decorative layer 2 is formed on the transparent acrylic resin sheet 1 or the colored concealed ABS resin sheet 4 by a printing method or the like.

The colorant used in the printing ink (or paint) may be a known dye or pigment, for example, inorganic pigments such as titanium white, carbon black, iron black, red iron oxide, graphite, cobalt blue, and aniline black. Organic pigments such as phthalocyanine blue, isoindolinone yellow, and quinacridone red; metal pigments such as aluminum foil powder; pearlescent (pearl) pigments such as titanium dioxide-coated mica foil powder; and other dyes. The pattern of the decorative layer is arbitrary, such as wood grain, stone grain, cloth grain, sand grain, squeezed pattern, geometric pattern, letters, symbols, and solid on the entire surface.

The decorative layer may be a functional layer such as a conductor layer or a magnetic layer, in addition to a decorative layer having a wood grain pattern or the like. For example, in the conductor layer, a conductive powder such as silver powder is dispersed instead of a coloring agent as a material to be contained in the binder of the specific resin. In the case of a magnetic material layer, a magnetic material powder made of iron oxide (γ-Fe ₂ O ₃ ) or the like is dispersed instead of the coloring agent.

[Adhesive Layer] The adhesive layer 3 is made of vinyl chloride
It is composed of a mixture of a vinyl acetate copolymer and an acrylic resin. These resins are the same resins as the binder resin of the decoration layer. Therefore, the resin is described as the binder resin of the decorative layer, and the description is omitted. However, it is not necessary that the contents of both resins and the mixing ratio of both resins are completely the same as those of the decorative layer. The content may be appropriately determined according to the adhesiveness, suitability for printing and coating, and the like. The adhesive layer is provided so that the resin sheet having the decorative layer formed thereon can be easily bonded and laminated to another resin sheet by heat fusion. Therefore,
When the decorative layer 2 is formed on the transparent acrylic resin sheet 1, the lower side of the decorative layer 2 (the colored concealed ABS resin sheet 4
Side) is provided with an adhesive layer 3 (see FIG. 1A). On the other hand, when the decorative layer 2 is formed on the colored concealed ABS resin sheet 4, the adhesive layer 3 is provided at a position above the decorative layer 2 (on the side of the transparent acrylic resin sheet 1) (see FIG. 1B). ]. The formation target of the adhesive layer 3 is, for example, in the form of FIG. 1A, the surface of the decoration layer of the transparent acrylic resin sheet 1 on which the decoration layer 2 has been formed, or in the form of FIG. For example, it is the side of the transparent acrylic resin sheet 1 of the colored concealing ABS resin sheet 4. The purpose of providing the same resin-based adhesive layer as the decorative layer is to supplement the adhesiveness of the decorative layer, which tends to decrease due to the inclusion of a coloring agent or the like in the binder resin, with this adhesive layer. is there. Note that the adhesive layer may be formed by a known printing method (or coating method) using an ink (or coating liquid) containing the specific resin.
The thickness of the adhesive layer is not particularly limited.
m.

[Colored concealed ABS resin sheet]
The BS resin sheet 4 is provided in order to hide the black color of the underlying black ABS resin sheet 5 and improve the coloring of the pattern by the decorative layer 3. To make the ABS resin sheet colored and concealable,
For example, an ABS resin to which a white pigment is added may be used. As the white pigment, for example, titanium white, zinc white, diantimony trioxide and the like are used. Among them, titanium white is preferred in terms of hiding properties, weather resistance, heat resistance, and other physical properties. If necessary, a colorant serving as a base color of the pattern of the decorative layer may be further added. As the coloring agent, various known pigments and dyes described in the above-mentioned decorative layer may be used.
As a pigment to be added to secure the hiding power, in addition to the hiding power, it can be used for color development of any pattern in general, and white (achromatic) white with a uniform spectral reflection spectrum in the visible light band. Only pigments are preferred. However, when the colored concealed ABS resin sheet is white, there is a black ABS resin sheet underneath to make the cut end face of the painting sheet inconspicuous. / Two layers of black become noticeable. For that reason,
It is unsuitable for a picture-formed product having a configuration in which the cut end face of the sheet is visible. For this reason, in order to make the cut end face of the sheet inconspicuous in this case as well, it is advisable to add a pigment having the same hue as that of the picture in addition to the white pigment. It is even better if black is added as far as the color development is not hindered. When a pigment is used as a colorant in combination with a white pigment, a dye may be used although the concealing property is inferior to that of the pigment. However, when a colorant such as a pigment or a dye is used in combination with a white pigment, color development and its versatility are reduced.

A resin sheet is used as a concealing layer between the upper decorative layer 3 and the lower black ABS resin sheet 5, and the ABS resin is used for this resin because the black ABS resin sheet on the back of the painting sheet is used. This is because good adhesion to the above can be ensured. As the ABS resin (acrylonitrile-butadiene-styrene copolymer) to be used, resins of various known grades may be used according to the application. Further, the thickness of the colored concealing ABS resin sheet may be at least a thickness that can secure the concealing property. Although it depends on the application, the thickness is usually about 30 to 200 μm.

[Black ABS Resin Sheet] The black ABS resin sheet 5 is a layer on the back side of the sheet for simultaneous painting with injection molding. By adopting the ABS resin sheet for this layer, the sheet for simultaneous painting with injection molding can be used. ABS resin, AS resin (acrylonitrile-styrene copolymer), PS resin (polystyrene) and other resin molded products made of styrene resin,
The lamination can be performed with good adhesion. By making this resin sheet black, the cut end surface of the sheet for simultaneous painting with injection molding can be made inconspicuous. In order to make the ABS resin sheet black, for example, an ABS resin to which a black pigment such as carbon black or iron black is added may be used. Among them, carbon black is (black) coloring, weather resistance,
It is preferable from the viewpoint of other physical properties. In addition, as the ABS resin to be used, various known grades of resin may be used according to the application. The thickness of the black ABS resin sheet is not particularly limited, but is usually about 100 to 300 μm in consideration of the total thickness and the like required for the entire sheet for simultaneous painting with injection molding.

[Others] In order to laminate the respective layers of the sheet for simultaneous painting with injection molding in the above configuration, for example, FIG.
In the case of a layer configuration as in (A), the following may be performed. A printed sheet is formed by printing the decorative layer 2 on the back surface of the transparent acrylic resin sheet 1 and subsequently coating or printing the adhesive layer 3. On the other hand, a black ABS resin sheet 5 and a colored concealed ABS resin sheet 4 were prepared,
The BS resin sheets are bonded to each other by a heat fusion method or a dry lamination method using a urethane resin-based adhesive or the like to form a laminated sheet. Then, the printed sheet and the laminated sheet may be laminated by heat-sealing the adhesive layer of the printed sheet. In addition, black A
The BS resin sheet and the colored concealed ABS resin sheet may be laminated simultaneously with the formation of the sheet by a two-layer coextrusion method.

Injection simultaneous simultaneous painting method: The simultaneous injection molding simultaneous painting method of the present invention uses the above-mentioned simultaneous injection molding simultaneous painting method using the injection molding simultaneous painting method according to the present invention.
The painting sheet is laminated and integrated on the surface of the resin molded product,
This is a method for obtaining a molded article with a picture painted with the painting sheet.

As described in Japanese Patent Publication No. 50-19132 and Japanese Patent Publication No. 43-27488, the method of simultaneous painting by injection molding is described in which a sheet for simultaneous painting by injection molding is used between the male and female molds of injection molding. Then, a resin in a fluidized state is injected and filled into a mold, and simultaneously with molding of a resin molded product, a sheet for simultaneous painting with injection molding is laminated and integrated to paint.

The simultaneous injection molding simultaneous painting method of the present invention takes various forms in the conventionally known simultaneous injection molding simultaneous painting method except that the above-mentioned injection molding simultaneous painting sheet of the present invention is used as the painting sheet to be used. What you get. For example, the pre-forming of the painting sheet may or may not be performed. Further, the prepainting sheet may or may not be preheated. In addition, the sheet for painting is usually preheated at the time of preforming.

Of course, if the drawing sheet has a large drawing, it is preferable to carry out preforming. On the other hand, when the drawing sheet has a small amount of drawing, the drawing sheet may be formed only by the resin pressure of the resin in the flowing state to be injected. At this time, if the drawing is shallow, the painting sheet may be formed by the resin pressure of the resin in the flowing state to be filled into the mold at the same time as the resin injection without preforming. Further, even when the painting sheet is formed by the resin pressure, the painting sheet may utilize the heat of the injection resin without preheating. In addition, the preforming of the sheet for painting is usually performed by using the injection mold also as the vacuum mold (in-line preforming), but before supplying the sheet for painting between the dies, another vacuum is formed outside the mold. Preforming (off-line preforming) such as vacuum forming of a sheet for painting with a forming die may be used. However, it is preferable that the preforming is performed by using both the injection molding die and the vacuum molding die in that the painting sheet can be efficiently and accurately laminated. However, in the case where the preformed painting sheets are collectively manufactured in another place in advance, the preforming is preferably in the form of off-line preforming. In the description of the present invention, vacuum forming includes vacuum pressure forming. The sheet for simultaneous painting with injection molding used in the simultaneous painting method for injection molding of the present invention may be either a single sheet or a continuous strip.

The injection molding simultaneous painting method of the present invention will be described with reference to FIG. In the embodiment shown in FIG. 2, the injection molding simultaneous painting sheet is heated and softened and preformed by a vacuum molding die, which is a separate mold from the injection molding mold, and then the molded injection molding simultaneous painting sheet is injected. This is an offline preform in which the resin is injected after being inserted into a molding die. Next, the injection molding simultaneous painting method of this embodiment will be further described with reference to FIG.

First, as shown in FIG.
Using a vacuum forming mold Mv having a suction means such as 1, a sheet for simultaneous injection-molded painting softened by heating with a heater 32 is preformed by vacuum forming. In the figure, the vacuum forming mold Mv
Is a mold surface having substantially the same shape and the same concavo-convex shape as an injection mold Mb described later. The vacuum forming mold Mv is made of metal such as iron or aluminum, or ceramics. Also,
The sheet S for simultaneous painting with injection molding is appropriately fixed by a frame-shaped sheet clamp 33. At this time, the back side (black ABS resin sheet side) of the sheet for simultaneous painting with injection molding is oriented in the direction of the injection resin side (upward in the drawing). The softening by heating by the heater 32 is, for example, non-contact radiation heating, but may be conduction heating by contact. Then, in the preforming, the sheet for painting is vacuum-molded by sucking from the suction hole and vacuum-forming.
Vacuum forming along the mold surface of In addition, vacuum forming may be vacuum press forming using both pressure and air, and this is also included.

Next, as shown in FIG. 2 (B), the preformed injection-molding simultaneous painting sheet S is
Supply between a and Mb. In this case, the injection mold Ma has a runner (runner) and a gate (gate) communicating with the injection nozzle, and the cavity of the injection mold Mb is the same or substantially the same as the mold surface of the preforming mold Mv. This is a mold for fixing the preformed painting sheet that has a shape.
These molds are made of metal such as iron or ceramics. In the mold open state, the painting sheet S is supplied between the two molds Ma and Mb, and the painting sheet S is fixed to the mold Mb by pressing with a frame-shaped sheet clamp 42 or the like. At this time, of course, the back side (the black ABS resin sheet side) of the sheet for simultaneous painting with injection molding is made to be the injection resin side on the right side of the drawing. Next, as shown in FIG. 2C, both molds are clamped, and a resin in a fluidized state such as a heated and melted state is injected and filled into a cavity formed by both molds. If there is an unnecessary portion of the painting sheet, it is appropriately trimmed (cut), and the painting sheet S is laminated on the surface of the resin molded product 6 as conceptually shown in the sectional view of FIG. Is obtained.

In the simultaneous painting method for injection molding, conventionally known injection molding resins can be used as the injection molded resin to be molded into a resin molded product, and there is basically no particular limitation. What is necessary is just to select according to physical properties, cost, etc. However, in the present invention, since an ABS resin is used on the back side of the sheet for simultaneous painting with injection molding, a styrene-based resin having good adhesion to the ABS resin is preferable. The styrene-based resin is, for example, an ABS resin, an AS resin, a PS resin, or the like.

Incidentally, as the injection molding resin, a resin colored by adding a coloring agent may be used as appropriate according to the application.
As the colorant, a known colorant as described in the decorative layer can be used. In addition, the injection molding resin, if necessary, silica, alumina, calcium carbonate, inorganic powder such as aluminum hydroxide, wood powder, fillers such as glass fiber,
Various known additives such as a stabilizer, a lubricant, and a rubber (elastomer) are contained.

FIG. 3 is a cross-sectional view exemplifying the resulting molded article P. The molded article P is obtained by laminating the sheet S for simultaneous painting with injection molding of the present invention on the surface of the resin molded article 6. In FIG. 3, the layer configuration in the sheet S for simultaneous painting with injection molding is omitted, but the configuration is as shown in FIGS. 1A and 1B. The molded article P with a picture can be used for various purposes such as a vehicle interior material, a vehicle exterior material, a home appliance or a cabinet of office equipment, and miscellaneous goods.

[0044]

The present invention will be described in more detail with reference to the following examples.

Example A sheet S for simultaneous painting with injection molding as shown in FIG. 1B was produced as follows. First, a coefficient of kinetic friction with respect to a flat glass surface is obtained by adding 0.2% by mass of an aliphatic alcohol-based lubricant and 0.4% by mass of a benzotriazole-based ultraviolet absorber to polymethyl methacrylate (PMMA) as a main component. Is a transparent acrylic resin sheet 1 having a thickness of 125 μm and having a thickness of 0.45, a colored concealed ABS resin sheet 4 having a thickness of 100 μm which is made yellow by adding titanium white as a pigment and red iron oxide, and carbon black. Was added and a black ABS resin sheet 5 having a thickness of 300 μm was prepared.

Then, a mixture of a vinyl chloride-vinyl acetate copolymer and an acrylic resin in a mass ratio of 1: 1 was used as the binder resin for the colored concealed ABS resin sheet 4.
The decorative layer 2 of the wood pattern is formed by gravure printing with an ink using red iron oxide, graphite, phthalocyanine blue, and carbon black as a coloring agent, and further, a vinyl chloride-vinyl acetate copolymer and an acrylic resin are further formed thereon. A 2 μm thick adhesive layer 3 made of a mixture having a mass ratio of 2 to 8 was formed on the entire surface by gravure printing to obtain a printed sheet.

The transparent acrylic resin sheet 1, the printing sheet, and the black ABS resin sheet 5 are arranged such that the printing surface of the printing sheet composed of the colored concealed ABS resin sheet 4 faces the transparent acrylic resin sheet 1. Were laminated by heat fusion using a rotary press for a roll plate to obtain a sheet for simultaneous painting with injection molding of the present invention.

Further, according to the injection molding simultaneous painting method adopting the form of the offline preforming as shown in the conceptual diagram of FIG. 2, the injection molding simultaneous painting sheet is prepared by using ABS resin as the injection molding resin. Then, simultaneously with the molding of the molded article on the surface of the resin molded article, the molded article was laminated and integrated to obtain a molded article P in which the sheet S for simultaneous painting with injection molding was laminated on the resin molded article 6 as shown in FIG.

In addition, as shown in FIG. 2A, the vacuum forming of the sheet for simultaneous painting with injection molding has the same cavity surface as the female mold Mb for injection molding, but is performed separately from the female mold Mb. On the mold Mv, the sheet for simultaneous painting by injection molding was heated to 120 ° C. in a non-contact state by the heater 32 composed of an infrared radiation hot plate.
Suction softened into the vacuum forming die Mv
, Preformed on the cavity surface of the vacuum forming mold Mv, cooled, and the preformed injection-molded simultaneous painting sheet was released. Then, as shown in FIG.
This pre-formed sheet for simultaneous painting with injection molding has a back surface (black ABS resin sheet side) with a male mold M for injection molding.
After attaching to the female mold Mb for injection molding with the sheet clamp 42 so as to face the a side, the male and female molds are clamped as shown in FIG. Then, the ABS resin heated and melted at a nozzle temperature of 220 ° C. was injected and filled, cooled and solidified, and then formed into a molded article integrated with the painting sheet. Then, the male and female molds were opened, and the molded article was molded. I took it out.

The obtained molded article with a picture had a high-quality painting feeling, the cut end face was hardly conspicuous, the black color of the ABS resin sheet on the back side was not adversely affected, and the color of the pattern was good. In addition, since no vinyl chloride resin sheet is used, the product is environmentally friendly, and it is easy to recycle an unnecessary sheet for simultaneous painting with injection molding after trimming.

[0051]

According to the sheet for simultaneous painting with injection molding of the present invention, the coloring of the picture is good even though the cut end face is not conspicuous. In addition, since the vinyl chloride resin sheet is not used, it is environmentally friendly, and a feeling of painting can be obtained. Also, the adhesion of each layer in the sheet for painting is good. In addition, it has good adhesion to a resin molded product of a styrene-based resin such as an ABS resin, an AS resin, and a PS resin. In addition, according to the injection molding simultaneous painting method of the present invention, it has a feeling of painting, and the cut end surface of the painting sheet is not conspicuous,
A molded product with good color development can be obtained.In addition, since the vinyl chloride resin sheet is not used, it is easy to recycle unnecessary painting sheets for simultaneous injection molding after trimming.
The painted product can be made environmentally friendly.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a sheet for simultaneous painting with injection molding of the present invention.

FIG. 2 is a conceptual diagram illustrating an injection molding simultaneous painting method of the present invention in one embodiment.

FIG. 3 is a cross-sectional view illustrating a molded article with a picture obtained by the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transparent acrylic resin sheet 2 Decorative layer 3 Adhesive layer 4 Colored and concealed ABS resin sheet 5 Black ABS resin sheet 6 Resin molding 31 Suction hole 32 Heater 33 Sheet clamp 42 Sheet clamp Ma Injection molding die (male) Mb Injection molding die (Female type) Mv Vacuum forming mold P Painted product S Injection molding simultaneous painting sheet

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) // B29K 105: 20 B29K 105: 20 B29L 9:00 B29L 9:00 F term (Reference) 4F100 AA21C AA21H AA23H AA37D AA37H AK15B AK15G AK22B AK22G AK25A AK25B AK25G AK74C AK74D AL01B AL01G AL05B AL05G BA04 BA07 BA10A BA10D CA13C CA13D CB00 J03J05 J03 of J03

Claims (3)

[Claims] 1. A laminate type sheet for simultaneous painting with injection molding, comprising: a decorative layer using a mixture of a vinyl chloride-vinyl acetate copolymer and an acrylic resin as a binder resin on the back side of a transparent acrylic resin sheet; An adhesive layer comprising a mixture of a vinyl-vinyl acetate copolymer and an acrylic resin, a colored concealed ABS resin sheet containing at least titanium white, a black ABS resin sheet containing at least carbon black,
A sheet for simultaneous painting with injection molding, which is laminated in this order. 2. A laminate type sheet for simultaneous painting by injection molding, wherein an adhesive layer made of a mixture of a vinyl chloride-vinyl acetate copolymer and an acrylic resin is provided on the back side of the transparent acrylic resin sheet, and A decorative layer using a mixture of a vinyl-vinyl acetate copolymer and an acrylic resin, a colored concealed ABS resin sheet containing at least titanium white, a black ABS resin sheet containing at least carbon black,
A sheet for simultaneous painting with injection molding, which is laminated in this order. 3. After the sheet for simultaneous painting with injection molding according to claim 1 or 2 is arranged between a pair of dies, both dies are clamped, and a resin in a fluid state is formed in a cavity formed by both dies. Injection molding, filling and solidifying to obtain a molded article in which the injection molding simultaneous painting sheet is laminated and integrated on the surface of the resin molded article at the same time as the molding of the resin molded article.