JP2000043094A - Injection molding simultaneous painting transfer sheet and injection molding simultaneous painting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve adhesive properties of a polyolefin resin by forming a support sheet as a polyolefin resin sheet with a specific biaxially orienting magnification, and forming an adhesive layer as a chlorinated polyolefin resin having a specific softening point, thereby deep drawing and giving moldability, dimensional stability and heat resistance upon injecting. SOLUTION: In a support sheet 1 of a transfer sheet S, a biaxially oriented polyester resin sheet having biaxially orienting magnifications in both lateral and longitudinal directions of 1.5 to 3.5 times is used. In an adhesive layer 2, a chlorinated polyolefin resin having a softening point of 90 to 100 deg.C is used. After the sheet S is disposed between both male and female molds of injection molding, a resin of a flowing state is injected in the mold, a resin molding is molded, and simultaneously a transfer layer of the sheet S is transferred to its surface and decorated. Thus, even when protrusions and recesses of the decorated surface are deep, the sheet S can be deeply drawn with excellent moldability, the sheet S can obtain excellent adhesive properties even with a scarcely adhesive polyolefin, and excellent dimensional stability to drying heat and excellent heat resistance to the injection resin are obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer sheet used in a simultaneous painting method for injection molding and a simultaneous painting method for injection molding using the transfer sheet. In particular, the present invention relates to a transfer sheet which has no wrinkles or tears during transfer, has excellent moldability, can be deep drawn, and has excellent adhesion to a polyolefin resin, and a method for simultaneous painting by injection molding using the sheet. .

[0002]

2. Description of the Related Art Conventionally, as an embodiment of a simultaneous painting method for injection molding, molded articles obtained by painting the surface of a resin molded article by transfer using a transfer sheet have been used for various purposes. The simultaneous injection molding painting method is an excellent decorating method in which a transfer sheet is formed by, for example, an injection mold so that painting can be performed even when the painting surface is a three-dimensional uneven surface. Therefore, in the case where the unevenness of the painting surface is deep, a sheet having moldability capable of deep drawing is used as the transfer sheet.
In the case of a transfer sheet, a thermoplastic resin sheet which is thinner than that of a laminate sheet is often used as a support sheet which is finally unnecessary. For this reason, if the moldability is improved, the support sheet is easily stretched due to the tension at the time of printing the transfer layer or the heat at the time of drying, and the dimensional stability is reduced,
In some cases, the transfer sheet may not withstand the heat of the molten resin to be injected, and the transfer sheet may be wrinkled or torn. Then, for example, Japanese Patent Application Laid-Open No. 7-205538
In the publication, as a transfer sheet having good moldability, dimensional stability, and heat resistance against injection, the support sheet has a stretch ratio of biaxial stretching of 1.5 to 3.5 times in both length and width. It discloses using a certain biaxially stretched polyester resin sheet.

[0003] However, even in the simultaneous injection molding painting method, when obtaining a painted molded product, an injection molding resin generally used is an acrylic resin, an ABS resin, a polycarbonate resin, or a polymer blend thereof. Is the main resin. However, when obtaining a molded product in which the surface of a resin molded product made of an inexpensive polyolefin resin is painted, the resin has poor adhesion. No) After the resin molded product is manufactured by injection molding or the like, the surface of the resin molded product is painted and decorated, or subjected to a base treatment such as a primer treatment and then painted by a hydraulic transfer method or the like. In most cases, it is a desired molded product.

[0004]

However, the transfer sheet disclosed in the above-mentioned publication has good moldability and can be deep drawn, but uses an inexpensive polyolefin resin such as a polypropylene resin as an injection resin. In this case, sufficient adhesion could not be obtained. Therefore, in the case of a molded article of a polyolefin resin, if the painting surface is an uneven surface that becomes a deep drawing of the transfer sheet, it has been decorated by painting or hydraulic transfer method as described above. However, in painting, it is difficult to give a picture,
Even if it can be done, it is impossible to make a complex, delicate or highly designable pattern that can be done only with a monotone and almost no reproducibility. Further, in the hydraulic transfer method, distortion due to the flow of the picture is apt to occur, and the number of steps such as a base treatment is increased, resulting in an increase in cost.

Accordingly, an object of the present invention is to provide a transfer sheet which can be painted simultaneously with molding of a resin molded article and which is used in an injection molding simultaneous painting method which is efficient in a process and has excellent moldability and deep drawing. An object of the present invention is to provide a transfer sheet which is excellent in dimensional stability and heat resistance at the time of injection and has excellent adhesion to a polyolefin resin. Another object of the present invention is to provide a simultaneous painting method for injection molding using such a transfer sheet.

[0006]

In order to solve the above-mentioned problems, a transfer sheet for simultaneous painting with injection molding of the present invention comprises:
In a transfer sheet comprising a support sheet and a transfer layer including at least an adhesive layer, which is used in a simultaneous painting method for injection molding, the support sheet has a biaxial stretching stretch ratio of 1.5 to 3. The adhesive layer was made of a chlorinated polyolefin resin having a softening point of 90 to 100 ° C. As a result, a transfer sheet having excellent dimensional stability, excellent heat resistance at the time of injection, and excellent formability such that deep drawing can be performed, and excellent adhesion to inexpensive polyolefin-based resins can be obtained.

In addition, the method of simultaneous painting by injection molding of the present invention
After inserting the above-mentioned transfer sheet for simultaneous painting with injection molding between a pair of dies so that the transfer layer side faces the resin to be filled, the dies are clamped to form a cavity formed by both dies. After filling the resin in the fluid state into the mold, the transfer sheet for simultaneous injection molding and painting is adhered to the surface of the resin molded product at the same time as the molding, and after lamination, both molds are opened, and only the support sheet is peeled off. A molded article in which a transfer layer including an adhesive layer was laminated on a resin molded article was used. As a result, the transfer sheet is excellent in heat resistance such that the transfer sheet does not wrinkle or tear due to heat, and can be painted even on a painting surface where the transfer sheet is deep drawn. Can be painted with good adhesion even with an inexpensive polyolefin resin.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view illustrating one embodiment of a transfer sheet for simultaneous painting with injection molding of the present invention, and FIG.
Is a conceptual diagram illustrating the simultaneous injection molding painting method of the present invention,
FIG. 3 is a cross-sectional view illustrating a molded article obtained by the present invention.
FIG. 4 is a sectional view of another embodiment of the transfer sheet for simultaneous painting with injection molding of the present invention.

[Transfer sheet for simultaneous injection molding and painting] The transfer sheet for simultaneous injection molding and painting according to the present invention comprises a support sheet,
The transfer layer includes at least an adhesive layer, and as shown in the cross-sectional view of FIG. 1 exemplifying one embodiment, usually, the transfer layer 2 laminated on the support sheet 1 is not limited to the adhesive layer 3. It has a decoration layer 4.

(Support Sheet) In the present invention, the support sheet 1 has a stretching ratio of biaxial stretching of 1.
A biaxially stretched polyester resin sheet having a ratio of 5-3.5 times, more preferably 2-3 times, is used. The biaxially stretched polyester resin sheet is usually biaxially stretched in the machine direction and the transverse direction at a stretch ratio of 4 times or more by a known biaxial stretcher, but the stretch ratio is specified in the above range. Therefore, the moldability of the transfer sheet to conform to the surface irregularities of the resin molded product, the dimensional stability to withstand the tension when the adhesive layer and the decorative layer are formed on the support sheet, and the transfer sheet at the time of resin injection In this case, a transfer sheet for simultaneous painting with injection molding which satisfies the heat resistance and the three physical properties capable of withstanding the above heat and pressure conditions can be obtained.
In addition, in the total thickness of the transfer sheet for simultaneous painting with injection molding,
Since the other layers such as the adhesive layer and the decorative layer are quite thin with respect to the support sheet, the moldability and heat resistance of the entire transfer sheet for simultaneous injection molding and painting are governed by the support sheet.
If the support sheet is a sheet having the above-mentioned properties, a satisfactory transfer sheet for simultaneous injection molding and painting can be obtained. If the draw ratio is less than the above range, the moldability will be better because it will be more easily stretched, but due to heat and stress during molding, especially in the case of a deep drawing shape, large distortion and tear of the sheet are likely to occur. In addition, the cost is high in terms of the apparatus at the time of film formation.
On the other hand, if the stretching ratio exceeds the above range, it is not preferable because the moldability is reduced because the film becomes more difficult to elongate.

The above-mentioned biaxially stretched polyester resin sheet is not particularly limited as long as it has the above-mentioned properties and has a releasability from the transfer layer. Examples of the polyester resin include polyethylene terephthalate, polyethylene terephthalate-isophthalate copolymer, and polybutylene terephthalate.
As the support sheet, a single layer or a laminate of two or more layers of these resin sheets (films) is used. In addition, various additives such as a release agent, a stabilizer, and an extender may be added to the resin sheet as needed to adjust physical properties. The thickness of the support sheet is selected depending on heat resistance, mechanical strength, and the like, and is not particularly limited, but is generally about 20 to 200 μm, usually about 25 to 100 μm.

A known release layer may be provided as a component of the support sheet on the transfer layer side of the support sheet in order to improve releasability from the transfer layer. The release layer is removed from the transfer layer integrally with the support sheet when the support sheet is peeled off. For the release layer, for example, a silicone resin, a melamine resin, a wax, or the like is used. The release layer has a thickness of about 0.1 to 4 μm.

(Adhesive Layer) As the adhesive layer 2, a chlorinated polyolefin resin having a softening point of 90 to 100 ° C. is used. The softening point is Vicat softening temperature (JIS K7206)
Regulation). As the chlorinated polyolefin resin, chlorinated polyethylene, chlorinated polypropylene or the like is used alone or in combination of two or more. By using the chlorinated polyolefin resin, the transfer layer of the transfer sheet for simultaneous injection molding and painting can be transferred with good adhesion even when the resin molded product is a polyolefin resin. Particularly, by setting the softening point in the range of 90 to 100 ° C., excellent adhesion can be obtained. When the softening point is less than 90 ° C., the heat resistance of the transfer layer even when the transfer layer is in close contact (particularly, the heat resistance as durability under environmental conditions on a molded product).
When the softening point exceeds 100 ° C., the adhesion of the injected resin due to heat during simultaneous painting by injection molding becomes insufficient.

The thickness of the adhesive layer may be appropriately determined according to the method of use and the like, but is usually about 1 to 10 μm. The method for forming the adhesive layer is not particularly limited, but is usually a known printing or coating means such as gravure printing or roll coating as an ink or coating liquid composed of a resin liquid obtained by diluting the above resin with a diluting solvent. Is formed. The adhesive layer may be composed of only a chlorinated polyolefin resin. However, in order to adjust and improve various physical properties such as printing (or coating) suitability of the ink (or coating liquid), if necessary, And various additives such as extender, preservative stabilizer and the like.

If the adhesive layer is used as a decoration layer by adding a coloring agent or the like, it may be possible to use only the adhesive layer as a transfer layer. However, it is difficult to provide a picture pattern. Yes, usually with its own decorative layer.

(Other layers: decorative layer) The transfer sheet for simultaneous painting with injection molding of the present invention is a transfer sheet for simultaneous simultaneous painting with injection molding, except that the support sheet and the adhesive layer are composed of the above-mentioned specific ones. Various layer configurations in the case of a sheet can be taken. For example, when a decorative layer is further provided as a transfer layer, the decorative layer is basically not particularly limited. The decorative layer is usually formed of printing ink or paint. Alternatively, a metal thin film layer or the like can be used as the decoration layer.

When the decorative layer is formed of printing ink or paint, the binder resin of the printing ink (or paint) includes acrylic resin, vinyl chloride-vinyl acetate copolymer, polyester resin, urethane resin, chlorinated polyethylene, A chlorinated polyolefin such as chlorinated polypropylene or the like may be used alone or as a mixture of two or more. The colorant used in the printing ink (or paint) may be a known dye or pigment, for example, titanium white, red iron oxide, graphite, ultramarine,
Carbon black, isoindolinone, quinacridone,
Use phthalocyanine blue or the like. The pattern of the decorative layer is arbitrary, such as wood grain, stone grain, cloth grain, sand grain, geometric pattern, characters, and solid on the entire surface.

The metal thin film layer serving as the decorative layer includes:
It is formed by a vacuum evaporation method, a sputtering method, or the like using aluminum, brass, gold, silver, copper, chromium, or the like. In addition, the metal thin film layer is an entire surface or a partial (picture-like or the like) layer.

(Other layers: release layer) The transfer layer is provided with a surface protective layer and a feeling of coating after transfer on the side in contact with the support sheet in order to adjust releasability from the support sheet. A release layer may be provided as a layer or the like. As the release layer,
In addition to the resins of the various binders listed with the printing ink for forming the decorative layer, an ionizing radiation curable resin made of an acrylic or epoxy resin and cured by ultraviolet rays or electron beams can also be used. The release layer is formed by a known printing method or coating method similar to the decoration layer. The thickness of the release layer is usually about 1 to 100 μm.

(Other layers: primer layer) In the adhesive layer, decorative layer, release layer, etc., a primer layer may be provided between the layers in order to improve the interlayer adhesion. The resin of the primer layer is not particularly limited, and may be appropriately selected from known ones. For example, a urethane resin may be used. As the urethane resin, a two-component curable urethane resin or a thermoplastic urethane resin may be used. Further, the primer layer may be formed by a known printing method or coating method using an ink or coating liquid made of such a resin.

[Injection Simultaneous Painting Method] The simultaneous injection molding simultaneous painting method of the present invention uses the above-described transfer sheet for simultaneous injection molding painting of the present invention to apply the so-called simultaneous injection molding painting method to the surface of a resin molded product. This is a method of obtaining a molded article painted with the transfer sheet by transferring and laminating the transfer layer.

Incidentally, the simultaneous injection painting method is to dispose a painted sheet between both male and female molds for injection molding as described in JP-A-6-315950 and JP-B-2-42080. After that, a resin in a fluid state is injected and filled into a mold, a transfer sheet is laminated on the surface of the resin at the same time as molding the resin molded product, and the support sheet is peeled off, and the transfer layer is transferred and painted. It is.

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 transfer sheet for simultaneous injection molding simultaneous painting of the present invention is used as the transfer sheet to be used. What you get. For example, the transfer sheet may be preformed or not. Further, the transfer sheet may or may not be preheated. It should be noted that the transfer sheet is usually preheated during the preforming. Of course, when the transfer sheet has a large drawing, it is preferable to perform preforming. On the other hand, when the transfer sheet is not squeezed, the transfer sheet can be formed by the resin pressure of the resin in the fluidized state to be injected. At this time, if the drawing is shallow, the transfer sheet may be formed by the resin pressure of the resin in the flowing state filled into the mold at the same time as the resin injection without preforming. Further, even when the transfer sheet is formed by resin pressure, the transfer sheet may utilize the heat of the injection resin without preheating. In addition, the pre-molding of the transfer sheet is usually performed by also using the injection mold as a vacuum mold, but before supplying the transfer sheet between the molds, the transfer sheet is vacuumed with another vacuum mold outside the mold. Preforming such as forming may be used. In addition, the vacuum forming includes vacuum pressure forming.

The injection molding simultaneous painting method of the present invention will be described with reference to FIG. The embodiment described here is a mode in which the transfer sheet is heated and softened between the molds, pre-molded by vacuum molding using an injection mold, and then the resin is injected by clamping before the mold is clamped.

First, as shown in FIG. 2A, as an injection mold, a mold Ma having a runner (runner) and a gate (gate) communicating with an injection nozzle, and a transfer hole having a suction hole 41 on the mold surface. A pair of molding dies of the mold Mb which also serves as a preforming mold for the sheet is used. These molds are made of metal such as iron or ceramics. In the mold opened state, the transfer sheet S for simultaneous painting with injection molding is supplied between both the molds Ma and Mb, and the transfer sheet S is fixed to the mold Mb by pressing with a frame-shaped sheet clamp 42 or the like. At this time, the adhesive layer side of the transfer sheet is naturally set to the injection resin side on the right side of the drawing. Next, the transfer sheet is appropriately heated and softened by a heater inserted between both molds. The heating is, for example, non-contact radiation heating, but may be contact heating. Then, the transfer sheet is sucked from the suction hole and vacuum formed, and the transfer sheet is preformed along the cavity surface of the mold Mb. In addition, vacuum forming may be vacuum press forming using both pressure and air, and this is also included. Next, the heater is retracted from between the two dies, the two dies are clamped as shown in FIG. 2B, and a cavity formed by the two dies is filled with a resin in a flowing state such as a heated and molten state. After the resin is solidified, the mold is opened and the molded product is taken out. The support sheet is taken out in a state where it is left on the mold Mb side, or the molded article is taken out in a state where the entire transfer sheet is laminated, the support sheet is peeled off, and only the transfer layer is laminated. Obtain a painted article.

In the injection molding simultaneous painting method of the present invention, as the resin to be injection-molded, there can be basically used those conventionally known in the injection molding simultaneous painting method, and there is no particular limitation. The injection molding resin is selected according to the required physical properties and cost of the product. For example, in the case of a thermoplastic resin, ABS (acrylonitrile-butadiene-styrene copolymer) resin, styrene resin, vinyl chloride resin, acrylic resin, polycarbonate resin, or polyethylene, polypropylene, polybutene, polymethylpentene, ethylene-propylene copolymer Polyolefin resins such as polymers, ethylene-propylene-butene copolymers, and olefin-based thermoplastic elastomers. In addition, in the case of a curable resin, a material which has been conventionally known as a two-part curable resin, such as an uncured resin liquid such as a urethane resin, an unsaturated polyester resin, or an epoxy resin, is used for simultaneous injection molding and painting. Can be used. The thermoplastic resin is melted by heating and injected in a flowing state, and the curable resin is heated appropriately and injected in a flowing state. However, the simultaneous injection molding painting method of the present invention is a method using the above-described transfer sheet for simultaneous injection molding painting of the present invention, and the most effective effect is obtained by utilizing the characteristics of the transfer sheet of the present invention. And the above-mentioned various polyolefin-based resins.

[Molded Article] An example of a painted molded article is shown in the sectional view of FIG. The molded article P illustrated in the figure has a configuration in which the transfer layer 2 is transferred to the surface of the resin molded article 5 and laminated by the above-described transfer sheet for simultaneous painting with injection molding of the present invention. Even if the resin of the resin molded product is a polyolefin resin, good adhesion between the transfer layer and the resin molded product can be obtained. Note that a molded product is usually a three-dimensional object in which the transfer layer has a non-planar surface such as an uneven surface, but the flat surface is a three-dimensional object in which the other surface is non-planar. But it is good.

[0028]

The present invention will be described in more detail with reference to the following Examples and Comparative Examples.

Example 1 A 50 μm-thick polyethylene terephthalate film having a draw ratio of 2 times in both the vertical and horizontal directions and an acrylic-melamine resin coated and cured on one side as a release layer. Is used as a support sheet, a release layer (thickness: 1.5 μm) of a release ink containing an acrylic resin as a main component resin is sequentially formed on the release layer, and a binder resin is formed of a copolymer of acrylic resin and vinyl chloride-vinyl acetate. A decoration layer (thickness: 2 μm) having a woodgrain pattern is formed by gravure printing using a mixture of a 1: 1 weight ratio with the coalesced material and a coloring pigment whose main component is a red pigment, carbon black, and graphite. Subsequently, a primer layer (thickness: 1 μm) is formed by gravure printing using a primer ink containing a two-component curable urethane-based resin as a main component resin, followed by chlorinated polypropylene (softening). A modified chlorinated polypropylene adhesive (solution) having the following composition whose main component is 90 ° C.) is applied to form an adhesive layer (4 μm thick), and the transfer sheet for simultaneous painting with injection molding of the present invention is obtained. Obtained. The transfer sheet showed good dimensional stability against tension during formation of the decorative layer and the like and heat during drying.

Modified chlorinated polypropylene adhesive composition Chlorinated polypropylene (softening point 90 ° C.) 16 parts by weight Storage stabilizer (epoxy resin) 1.6 parts by weight Silica 1.6 parts by weight Ethyl acetate 5.7 parts by weight Methyl ethyl ketone 5. 7 parts by weight Toluene 69.4 parts by weight

FIG. 4 is a cross-sectional view of the transfer sheet S for simultaneous painting with injection molding obtained above, and shows the surface of the support sheet 1 composed of the sheet base 6 and the release layer 7 on the release layer side 7. , Transfer layer 2
As a transfer sheet, a release layer 8, a decorative layer 4, a primer layer 9, and an adhesive layer 3 are laminated in this order.

Then, the transfer sheet for simultaneous simultaneous injection molding and painting is laminated on the surface of the adherend made of a resin molded product by the simultaneous simultaneous injection molding and painting method of the present invention as shown in the conceptual diagram of FIG. After that, peel off the support sheet,
As shown in FIG. 3, a molded article P having a layer configuration in which the transfer layer 2 was laminated on the resin molded article 5 by transfer was obtained. The transfer sheet showed good heat resistance without wrinkles or breakage of the injection resin, and also showed good moldability. In addition, as the injection molding resin,
Polypropylene resin (HIP manufactured by Mitsui Toatsu Chemicals, Inc.
-145) was used. In the injection molding simultaneous painting method, the transfer sheet was formed by using an injection mold as a vacuum mold, supplying between the molds, softening by heating, and preforming by vacuum molding. As the injection molding die, a die having a suction hole for preforming the sheet on the female die side, which is a die from which a resin molded product to be a box-shaped panel was obtained was used.

Further, the obtained molded article was subjected to the following durability test. As a result, there was no particular change in the molded article, and the molded article exhibited excellent durability such as excellent heat resistance. Further, the molded article was painted with a wood grain pattern and had an excellent design feeling.

[Performance Evaluation Test] In addition to the moldability of the transfer sheet for simultaneous painting with injection molding, the adhesiveness of the transfer sheet in a molded product and its durability such as heat resistance, moisture resistance, weather resistance, and cold resistance. , Performance was evaluated. Table 1 summarizes the results of the durability test, the content of the chlorinated polypropylene used, and the moldability of the transfer sheet, together with other examples and comparative examples.

Formability: It is visually confirmed whether or not the transfer sheet is formed by following the surface irregularities of the painted surface sufficiently. If the transfer sheet sufficiently follows the irregularities of the painted surface, it is good. Insufficient ones were considered bad. Adhesion: As a grid test, cuts were made in the shape of a grid on the surface (transfer layer surface) of the molded product (transfer layer surface) at intervals of 2 mm to form 10 × 10 grids in a total of 100 grids vertically and horizontally. After sticking an adhesive tape (manufactured by Nichiban Co., Ltd., “Cellotape” (registered trademark) 24 mm width, industrial use) at 25 ° C., it was vigorously peeled off, and it was evaluated whether or not the transfer layer was peeled off together with the tape. A sample without any squares was evaluated as good, and a sample with squares was evaluated as poor. Heat resistance: After the molded article was placed in an oven at 70 ° C. for 168 hours, it was taken out and cooled to room temperature. Then, the presence or absence of abnormality in appearance was visually evaluated. Moisture resistance: After placing the molded article in a thermo-hygrostat at 50 ° C. and 95% RH for 500 hours, take it out, cool it down to room temperature, and visually evaluate the appearance for abnormalities.
Anything that was abnormal was determined to be defective. Weather resistance: The molded article was subjected to an accelerated weather resistance test for 168 hours using a sunshine weatherometer (carbon arc lamp type, black panel temperature 63 ° C., rainfall time during 18 minutes / 120 minutes), and then abnormal appearance was observed. The presence or absence was visually evaluated, and those without abnormality were evaluated as good, and those with abnormality were evaluated as poor. Cold resistance: After placing the molded article in a -30 ° C constant temperature bath for 168 hours, taking it out and warming it to room temperature, it is visually evaluated for the presence or absence of abnormalities in the appearance. And

Example 2 In Example 1, the chlorinated polypropylene used for the adhesive layer had a softening point of 10%.
A transfer sheet for simultaneous painting with injection molding was obtained in the same manner as in Example 1 except that the temperature was changed to 0 ° C. Then, a molded article was obtained by an injection molding simultaneous painting method using this transfer sheet. The transfer sheet for simultaneous painting with injection molding had good dimensional stability at the time of forming the transfer layer, good moldability and good heat resistance at the time of injection, and also had good durability properties in the molded product.

Comparative Example 1 In Example 1, the chlorinated polypropylene used for the adhesive layer had a softening point of 85.
Except that the temperature was changed to ° C., a transfer sheet for simultaneous painting with injection molding was obtained in the same manner as in Example 1. Then, a molded article was obtained by an injection molding simultaneous painting method using this transfer sheet. The transfer sheet for simultaneous painting with injection molding had good dimensional stability when forming the transfer layer, good moldability and good heat resistance during injection, but the molded product had surface irregularities in the transfer layer in the heat resistance test. The heat resistance was poor, and in the weather resistance test, the weather resistance was poor with fine cracks occurring in the transfer layer.

Comparative Example 2 In Example 1, the chlorinated polypropylene used for the adhesive layer had a softening point of 10
A transfer sheet for simultaneous painting with injection molding was obtained in the same manner as in Example 1 except that the temperature was changed to 4 ° C. Then, a molded article was obtained by an injection molding simultaneous painting method using this transfer sheet. The transfer sheet for simultaneous painting with injection molding had good dimensional stability at the time of forming the transfer layer, good moldability, and good heat resistance at the time of injection, but the molded product had poor adhesion.

Comparative Example 3 In Example 1, the chlorinated polypropylene used for the adhesive layer had a softening point of 11
A transfer sheet for simultaneous painting with injection molding was obtained in the same manner as in Example 1 except that the temperature was changed to 3 ° C. Then, an attempt was made to obtain a molded product by an injection molding simultaneous painting method using this transfer sheet. The transfer sheet for simultaneous painting with injection molding had good dimensional stability at the time of forming the transfer layer, moldability, and heat resistance at the time of injection. However, the simultaneous painting by injection molding was successfully performed up to the pre-molding of the transfer sheet, but the transfer sheet (transfer layer) did not adhere to the resin molding due to the heat pressure of the injection resin, and the transfer layer was transferred. Was not obtained.

[0040]

[Table 1]

[0041]

According to the transfer sheet for simultaneous painting with injection molding of the present invention, excellent moldability for deep drawing of the transfer sheet can be obtained even when the unevenness of the painting surface is deep, and the resin molded product can be obtained. Excellent adhesiveness can be obtained even when made of a polyolefin-based resin that is difficult to adhere to. In addition, good dimensional stability against tension during formation of a transfer layer such as a decorative layer and heat during drying thereof, and good heat resistance against an injection resin are obtained, and wrinkles and tears do not occur on the transfer sheet. Further, in the simultaneous injection molding painting method of the present invention, by using the transfer sheet for simultaneous injection molding painting, the transfer sheet is deep drawn even in the case of a deeply painted surface,
In addition, even when the resin molded product is made of a polyolefin-based resin that is difficult to adhere to, excellent adhesiveness can be obtained. In addition, the transfer sheet can be painted without wrinkles or tears. In addition, the transfer layer can be transferred and painted on the surface of the resin molded product with excellent adhesion in one step at the same time as the molding of the resin molded product.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating one embodiment of a transfer 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 an example of a molded article obtained.

FIG. 4 is a cross-sectional view illustrating another embodiment of the transfer sheet for simultaneous painting with injection molding of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Support sheet 2 Transfer layer 3 Adhesive layer 4 Decorative layer 5 Resin molding 6 Sheet base material 7 Release layer 8 Release layer 9 Primer layer 41 Suction hole 42 Sheet clamp Ma Injection mold (male) Mb Injection mold (Female type) P Molded product S Transfer sheet for simultaneous painting with injection molding

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 3B005 EB01 EB05 EB09 EC03 EC13 EC14 EC21 FA04 FE04 FE08 FE13 FF01 FG01Z FG04X GA06 4F100 AK10B AK25 AK41A AK42 AK51 AT00A BA02 BA03 BA05 BA07 CA03 EJ38BJ04 J03 EJ38BJ04 J03 J04B03 YY00B 4F206 AA03 AA13 AA15 AA28 AD05 AD09 AD20 AG02 AG03 AR20 JA07 JB19 JF05 JL02 JN11 JW50

Claims (2)

[Claims] 1. A transfer sheet comprising a support sheet and a transfer layer containing at least an adhesive layer, which is used in a simultaneous painting method for injection molding, wherein the support sheet has a biaxial stretching stretch ratio of 1 in both the longitudinal and transverse directions. .
A transfer sheet for simultaneous painting by injection molding, comprising a biaxially stretched polyester resin sheet of 5 to 3.5 times, and an adhesive layer comprising a chlorinated polyolefin resin having a softening point of 90 to 100 ° C. 2. The transfer sheet for simultaneous painting with injection molding according to claim 1 is inserted between a pair of molds so that the transfer layer side faces the resin to be filled, and then both molds are clamped. ,
After filling the resin in the flow state into the cavity formed by both molds, and closely attaching and laminating the transfer sheet for simultaneous painting with injection molding on the surface of the resin molded product at the same time as molding, the molds of both molds are opened,
Injection molding simultaneous painting method, in which only a support sheet is peeled off to form a molded article in which a transfer layer including an adhesive layer is laminated on a resin molded article.