JP2002187161A - Decorative sheet, injection molding in-mold decorating method, and decorative molded article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To apply a matte design having a transparent feeling to an adherend such as a resin molded article or the like without generating the molding failure, lowering of moldability, disapperance of the matte feeling and whitening of a decorative sheet or an increase in the cost of a mold in decoration molding such as an injection molding in-mold decorating method or the like. SOLUTION: The decorative sheet S is obtained by successively laminating a first transparent resin base material sheet having a matte surface comprising a fluoroplastic resin to which a matting agent is added, a second transparent resin base material sheet 2 comprising an acrylic resin to which no matting agent is added, an appropriate decorative layer 4 and an adhesive layer 5 from a surface side. This decorative sheet S is used to decorate an adherend such as a resin molded article by decoration molding such as injection molding in- mold decorating or the like to manufacture a decorative article such as a decorative molded article or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a technique for decorating the surface of various articles. More specifically, as a decorative sheet of a laminate type suitable for decorative molding such as simultaneous injection molding decoration, a decorative sheet capable of imparting a matte design to the surface of a decorative molded product, and the sheet was used. The present invention relates to a simultaneous decoration method for injection molding and a decorative molded product.

[0002]

2. Description of the Related Art Conventionally, decorative articles obtained by laminating a decorative sheet on a surface of an article such as a resin molded article have been used for various purposes. As a decorating method for forming and using a decorative sheet, for example, there is an injection molding simultaneous decorating method disclosed in Japanese Patent Publication No. 50-19132, Japanese Patent Application Laid-Open No. 11-91041, and the like. By forming a decorative sheet on the surface at the same time as the molding of the resin molded product and by laminating and integrating the same, a decorative molded product with a decorated surface can be obtained.

[0003] When a matte feeling is required on the surface, for example, the following method has been used. (1) In the case of the simultaneous decorating method of injection molding, a matting agent is not added to the decorating sheet itself, and irregularities such as squeezing are provided on the mold surface of the injection mold. Then, since the irregularities of the mold surface are formed on the surface of the decorative sheet in contact with the mold surface during molding, the surface of the decorative molded product (decorative sheet) is matted as an irregular surface. (2) A decorative sheet without a matting agent is used, which is formed by embossing or the like on the surface in advance to form a mat.
(3) A matting agent is added to the base sheet to make the decorative sheet itself matte.

[0004]

However, the above (1)
In the method of (1), the surface gloss can be adjusted (matte, low gloss) by irregularities such as squeezing in the simultaneous injection molding decorating method. However, when two types of matte products and mirror products are manufactured, injection molding Since at least two molds (at least the cavity surface portion) are required, there is a problem that the cost is increased. In the above method (2), when the decorative sheet is formed by vacuum forming or the like, the heat of heating and softening the sheet returns the unevenness of the surface of the decorative sheet, so that the matte disappears and the matte surface disappears. In some cases. Furthermore, in the case of simultaneous decoration by injection molding, the matte disappeared more easily because the unevenness was restored even by the heat and pressure of the resin at the time of injection molding. In addition, in the method (3), the amount of the matting agent added to the base sheet (mixing ratio) increases in order to make the surface matte. However, in this case, since the decorative sheet used for injection molding or the like has a thickness of about 100 to 300 μm, the integrated diffusion light amount in the thickness direction increases, and the appearance becomes whitish (whitening), and the sheet is formed by a matting agent. It becomes brittle and the formability of the decorative sheet is reduced. On the other hand, when the thickness of the base material sheet is extremely thin, there has been a problem that molding defects such as wrinkles or tears are insufficient during molding.

[0005] That is, an object of the present invention is to provide a decorating sheet for matte decorating of an adherend, which results in whitening (decrease in transparency) of the decorating sheet itself and poor molding (wrinkles and tears). The purpose of the present invention is to provide a matte design without causing deterioration in moldability and loss of matte feeling. Furthermore, when the decoration method is simultaneous injection molding decoration, without raising the cost of the injection mold,
It is to give a matte design.

[0006]

Therefore, in order to solve the above-mentioned problems, the decorative sheet of the present invention is a decorative sheet for molding, which is used in a decorative sheet used for simultaneous injection molding and decorating. From a laminate obtained by laminating a matte and transparent first resin base sheet made of a fluororesin with a matting agent added thereto and a transparent second resin base sheet made of an acrylic resin without a matting agent added Configuration.

[0007] Thus, the base sheet contains a matting agent to provide a matte design (first resin base sheet), and the moldability is maintained without the matting agent. The layer (first resin base sheet), which is divided into a layer (first resin base sheet) and a matting agent, is made of fluororesin, so that the resin has slipperiness and durability. Depending on the properties, even the thin film (the first resin base sheet) can prevent the matting agent from falling off and the layer itself from being worn. For this reason, the layer (the second resin substrate sheet) that maintains the moldability is thickened so that the main body of the total thickness as a decorative sheet can be secured here, and the resin of this layer is an acrylic resin. The moldability is maintained by the thermoplasticity. Moreover, since the transparency and easy adhesion of the acrylic resin can be utilized, the appearance of the decorative sheet can be prevented from being whitened even when a matting agent is used.
Further, since the matting is provided by the addition of a matting agent, the matting does not disappear during molding. As a result of the above, when the decorative sheet is used to decorate the adherend by molding the sheet, the decorative sheet does not suffer from poor molding (wrinkles and tears), reduced moldability, and loss of matte feeling. A matte design can be provided. Also,
Due to the matting, the decorating sheet itself is kept transparent without whitening, and can be decorated with a matte and transparent feeling.
In addition, if this decorative sheet is applied to simultaneous decoration by injection molding, a matte design can be provided by the decorative sheet itself, so that the cost of the injection molding die is lower than when a matte surface is formed by the injection molding die. The matte design can be provided by avoiding the rise.

[0008] The injection molding simultaneous decorating method of the present invention comprises:
Insert the decorative sheet between the male and female molds with the second resin base sheet side facing the injection resin side, then clamp both molds, and flow into the cavity formed by both molds. The resin in the state was injected, and after the resin was solidified, the mold was opened to obtain a decorative molded product in which the decorative sheet was laminated on the surface of the resin molded product.

As described above, since the molding is performed using the decorative sheet of the present invention, the effect of the decorative sheet described above is obtained.
As a result, it is possible to provide a matte design having transparency without increasing the cost of the injection mold, poor molding (wrinkles and tears), reduced moldability, loss of matte feeling, and whitening.

Further, the decorative molded article of the present invention comprises a resin molded article comprising at least a transparent second resin substrate sheet of an acrylic resin without a matting agent and a fluororesin with a matting agent added. The first resin substrate sheet having a matte surface and being transparent was laminated in this order.

[0011] With such a configuration, the decorative molded product is a product obtained by using the decorative sheet of the present invention or the simultaneous injection molding and decorating method of the present invention. It becomes a decorative sheet or a molded product that can enjoy the effects of the simultaneous injection molding and decorating method. That is, a matte design having transparency can prevent increase in cost of the injection mold, poor molding (wrinkles and tears), decrease in moldability, loss of matte feeling, and whitening (decrease in transparency) which occur during manufacturing. It becomes a molded product.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

Decorative sheet: First, the decorative sheet will be described.

[Outline] One embodiment of the decorative sheet of the present invention is illustrated in the sectional view of FIG. The decorative sheet S shown in the drawing is, in order from the surface, a first matte and transparent first resin base sheet 1 made of a fluororesin to which a matting agent a is added, and a transparent sheet made of an acrylic resin without a matting agent. Second resin base sheet 2
The decorative sheet has a configuration in which a decorative layer 4 and an adhesive layer 5 are laminated in this order on the surface of the second resin base material sheet 2 on the back surface side. The decorative layer 4 and the adhesive layer 5 are layers provided as needed.
The decorative sheet S of the present invention comprises the first resin base sheet 1 and the second resin base sheet 1.
The resin base sheet 2 is an essential layer. The matte design is provided by the first resin base sheet 1 on the front side, and the moldability and the like are maintained by the second resin base sheet 2 on the back side. The above specific first
The base sheet 3 is composed of the resin base sheet 1 and the specific second resin base sheet 2.

The decorative sheet of the present invention is provided with a decorative layer 4, an adhesive layer 5, etc., as appropriate, in addition to the first resin base sheet 1 and the second resin base sheet 2, which are essential layers. Although not shown, other illustrations may be omitted. For example, an interlayer may be provided between the first resin base sheet 1 and the second resin base sheet 2 or between the second resin base sheet 2 and the decorative layer 4. A configuration in which a primer layer or the like for improving adhesion is provided may be employed.

[First and Second Resin Base Sheets] In the present invention, the base sheet 3 comprises a first resin base sheet 1 and a second resin base sheet 2. A first resin substrate sheet 1 made of a transparent fluororesin to which a matting agent a has been added is disposed on the surface of the substrate sheet 3 (the surface exposed to the outermost surface when laminated on the adherend). With this, matte to the surface and
Due to the abrasion resistance and heat and chemical resistance of fluororesin,
The matte design of the surface can be maintained better. As a result, the first resin base sheet can be made thinner while maintaining the matte design, as compared with the case where another resin is used. Then, on the back surface side of the base sheet 3, the second resin base sheet 2 made of a transparent acrylic resin without a matting agent is disposed. This imparts transparency, moldability (thermoplasticity), and easy adhesion to an adherend. In addition, since the first resin base sheet can be formed into a thin film by using a fluororesin, the second resin base sheet can mainly play a necessary total thickness as a decorative sheet.

The thickness of the first resin substrate sheet may be set according to the required degree of matting. Generally, if the thickness is 50 μm or less, the performance is often satisfied. Note that the minimum thickness of the first resin base material sheet is larger than the average particle size of the matting agent, and is 10 μm in view of film formability and film strength.
It is preferable that the degree is not less than about.

On the other hand, the thickness of the second resin substrate sheet to which the matting agent is not added includes the thickness of the first resin substrate sheet and the like, which is necessary for maintaining formability as a decorative sheet. What is necessary is just to secure the total thickness, and generally 50-200
The range is about μm.

The matting agent a to be added to the fluororesin in the first resin base sheet is not particularly limited, but examples thereof include inorganic substances such as silica, alumina, calcium carbonate, aluminosilicate, and barium sulfate. Particles made of organic polymers such as polyethylene, urethane resin, polycarbonate, polyamide (nylon) and the like are used. The average particle size of the particles is about 1 to 10 μm, and the amount added is 5 to
It is about 30% by mass. The shape of the particles is a polyhedron,
Spherical, scale-like, etc.

When laminating the first resin base sheet and the second resin base sheet, since the fluororesin is poor in chemical adhesiveness, the resin forming both sheets is heated and melted. In this state, a method of co-extrusion from a T-die and fusing both sheets simultaneously with film formation is preferable. In addition, using a sheet that has already been formed into a film, the adhesive surface is subjected to surface adhesion treatment such as corona discharge treatment or plasma treatment to generate a polar functional group such as a hydroxyl group or a carboxyl group on the adhesion surface, thereby increasing wettability. And then lamination can be performed by a dry lamination method via an adhesive layer such as a two-component curable urethane resin or epoxy resin.

The fluororesin used for the first resin substrate sheet includes polyvinyl fluoride, polyvinylidene fluoride, ethylene-tetrafluoroethylene copolymer,
Fluorinated ethylene, tetrafluoroethylene-6-fluoropropylene copolymer or the like can be used. In addition, wear resistance,
An acrylic resin may be added to a maximum of about 20% by mass within a range that does not impair the heat resistance and chemical resistance, so that the adhesive property of the acrylic resin to the second resin base sheet may be improved.

The acrylic resin used for the second resin base sheet is, for example, polymethyl (meth) acrylate, polyethyl (meth) acrylate, polybutyl (meth) acrylate, methyl (meth) acrylate
Butyl (meth) acrylate copolymer, ethyl (meth)
Acrylate-butyl (meth) acrylate copolymer,
Methyl (meth) acrylate-styrene copolymer, methyl (meth) acrylate-2 hydroxyethyl (meth)
Acrylate copolymer, methyl (meth) acrylate-
A resin composed of a homopolymer of an alkyl (meth) acrylate monomer such as an ethylene copolymer or a copolymer with another monomer can be used alone or in combination of two or more thereof.

[Decoration Layer] The decoration layer 4 is provided as needed. The decorative layer 4 is a layer that typically represents a pattern such as a pattern or a character. The pattern is arbitrary, for example,
Wood grain, stone grain, cloth grain, sand grain, geometric patterns, letters, symbols, solid solids, etc. are used alone or in combination of two or more according to the application. The decorative layer may be formed by a conventionally known forming method and material such as a printing method such as gravure printing, silk screen printing, and offset printing. Further, a metal thin film layer or the like in which a metal such as aluminum, chromium or the like is partially or entirely formed by a known vapor deposition method or the like is also used as the decorative layer.

The ink for forming the decorative layer comprises a vehicle made of a binder and the like, a coloring agent such as a pigment and a dye, and various additives appropriately added thereto. A single resin selected from a vinyl-vinyl acetate copolymer, a polyester resin, a cellulose resin, a chlorinated polypropylene, a urethane resin, a polyamide resin, or the like, or a mixed resin of two or more types is used. Examples of the coloring agent include inorganic pigments such as titanium white, zinc white, carbon black, iron black, red iron oxide, cadmium red, ultramarine, cobalt blue, graphite, and titanium yellow, phthalocyanine blue, indaslen blue, and Organic pigments such as indolinone yellow, benzidine yellow, quinacridone red, and perylene red; metal pigments such as metal powders or scales such as aluminum and brass; pearlescent (pearl) pigments such as powder or scales of titanium dioxide-coated mica; Dyes and the like are used.

When the decorative layer is formed by printing in contact with the second resin base sheet, the first resin base sheet is made of an acrylic resin as a binder resin of the ink to be used. It is. The acrylic resin may be appropriately selected from those listed in the first resin base sheet, and may be methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, or 2-ethylhexyl. (Meta)
(Meth) acrylic acid alkyl esters such as acrylate and octyl (meth) acrylate; and 2-hydroxyethyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate and 2-hydroxy-3-phenoxypropyl (meth) acrylate An acrylic polyol obtained by copolymerizing a (meth) acrylate having a hydroxyl group in the molecule can also be used.

The decorative layer has a structure in which the first and second resin base sheets can be used as a protective sheet, as shown in FIG. Side) is generally used, but it may be provided on the front side of the first resin base sheet 1 or between the first resin base sheet 1 and the second resin base sheet 2. For example, in addition to the configuration of FIG. 1 or the configuration including only the first resin substrate sheet 1 and the second resin substrate sheet 2, the surface of the first resin substrate sheet 1 is matted. For example, a decorative layer may be provided thinly or in a pattern as far as the unevenness for the purpose is not impaired (not shown).

Further, as the decorative layer, only a pattern, a character,
In addition to a layer expressing a visible pattern such as a figure, an invisible pattern or a layer imparting functionality such as conductivity may be used. For example, conductors, antistatic agents, fluorescent materials, magnetic materials,
This is a layer containing an infrared absorber, an ultraviolet absorber, and the like. These layers can be formed by using an ink containing these substances instead of the coloring agent.

[Adhesive Layer] The back side of the decorative sheet may be properly coated with a corona discharge treatment, a plasma treatment, a primer coating, etc., as necessary, in order to improve the adhesiveness to an adherend such as a resin molded product. Alternatively, the adhesive layer 5 may be provided after or without performing the easy adhesion processing. As the adhesive layer 5, for example, a known resin such as a thermoplastic resin or a thermosetting resin is used as a heat-sensitive adhesive. In the thermoplastic resin, for example, one or a mixture of two or more of an acrylic resin, a chlorinated polyolefin resin, a vinyl chloride-vinyl acetate copolymer, a thermoplastic urethane resin, a thermoplastic polyester resin, a polyamide resin, a rubber-based resin, and the like Is used. As the thermosetting resin, a urethane resin, an epoxy resin, or the like is used. The adhesive layer is formed by using a known printing or coating method such as gravure printing or roll coating. The thickness of the adhesive layer is not particularly limited, but is usually about 1 to 100 μm.
Further, a coloring agent as listed in the decorative layer may be added to the adhesive layer.

[Laminating method of decorative sheet on adherend] As a method of laminating the decorative sheet on the adherend, a method of applying heat and pressure to the decorative sheet at the time of lamination is the method of the present invention. It is suitable as a method that can take advantage of the characteristics of the sheet, but of course,
The decorative sheet of the present invention may be used in other lamination methods. In any case, of course, the second resin substrate sheet side is the adherend side with respect to the first resin substrate sheet.
By stacking the decorative sheet on the adherend, a decorative article is obtained as a laminate of the adherend and the decorative sheet.

As a laminating method for applying heat pressure when laminating a decorative sheet on an adherend, for example, (1) injection molding simultaneous decorating method, (2) vacuum forming laminating method, and (3) elastic roller are used. And other laminating methods. Since (1) will be described later in detail, the lamination method of (2) and (3) will be further described here.

The vacuum forming lamination method (2) is described in
No. 45768 (overlay method), Japanese Patent Publication No. 60-
As described in JP-A-58014 (vacuum pressing method) and the like, a decorative sheet is opposed to or placed on the surface of a three-dimensional adherend such as a molded product with an adhesive therebetween, and is placed from the adherend side Is a method of laminating a decorative sheet on an adherend by at least the pressure of vacuum suction. In the laminating method using the elastic roller of (3), the decorative sheet is opposed to or placed on the plate-shaped adherend with an adhesive therebetween, and the elastic roller is placed from the decorative sheet side. To laminate the decorative sheet on the adherend. For columnar adherends such as cylinders and polygonal columns, Japanese Patent Publication No. 61-5895 and Japanese Patent Publication No. 56-2
As described in Japanese Patent No. 3771 or the like, a plurality of rollers having different directions (using an elastic roller) are provided while supplying a decorative sheet in the longitudinal direction of a columnar adherend via an adhesive layer therebetween. There is also a lapping method in which a decorative sheet is sequentially pressure-bonded to a plurality of side surfaces constituting an adherend and the decorative sheet is laminated.

Injection molding simultaneous decorating method: In the injection molding simultaneous decorating method of the present invention, the decorative sheet of the present invention is used to decorate the surface of a resin molded product by a so-called injection molding simultaneous decorating method. This is a method in which a sheet is formed and laminated to obtain a decorative molded article decorated with a matte design using the decorative sheet.

As described in Japanese Patent Publication No. 50-19132 and Japanese Patent Publication No. 43-27488, a method for simultaneous decoration by injection molding is to insert a decorative sheet between the male and female molds, The molds are clamped, the resin in the fluid state is injected into the cavity formed by the molds and solidified, and a decorative sheet is laminated on the surface at the same time as the molding of the resin molded product to obtain a decorative molded product. Is the way.

The simultaneous injection molding and decorating method of the present invention can take various forms in the conventionally known simultaneous injection molding and decorating method, except that the above-described decorative sheet of the present invention is used as the decorative sheet to be used. Things. For example, basically, in a mode in which the decorative sheet is preformed or not,
Either is acceptable. Further, the decorative sheet may or may not be preheated. Note that the decorative sheet is usually preheated at the time of preforming. However, in order to maximize the effect of the decorative sheet of the present invention, it is preferable that the decorative sheet is formed anyway.

Of course, when the decorative sheet has a large drawing, it is preferable to carry out preforming. On the other hand, when the decorative sheet has a small drawing, the decorative 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 decorative sheet may be formed only by the resin pressure of the resin in the flowing state to be filled in the mold at the same time as the resin injection without preforming. Further, even when the decorative sheet is formed by resin pressure, the decorative sheet may utilize the heat of the injection resin without preheating. In addition, the pre-molding of the decorative sheet is usually performed by using the injection mold also as the vacuum mold, but before supplying the decorative sheet between the molds, the decorative mold is decorated with another vacuum mold outside the mold. Preforming such as vacuum forming of a sheet (offline preforming) may be used. However, preforming is
A mode in which the injection molding die and the vacuum molding die are used in combination is preferable in that the decorative sheet can be efficiently and accurately laminated. However, in the case where the preformed decorative 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 injection molding simultaneous decorating method of the present invention will be described with reference to a conceptual diagram of FIG. In addition, the form described here is a form in which the decorative sheet is heated and softened between the molds, preliminarily molded by vacuum molding with an injection mold, and then resin is injected by clamping before the mold is clamped. .
This form is more preferable when the decorative sheet is deeply drawn out of the various combinations of the preforming and preheating of the decorative sheet described above. Also, this is one of the modes in which the effect of the decorative sheet of the present invention can be utilized. It should be noted that the decorative sheet used in the simultaneous injection molding decorative method of the present invention may be either a single sheet or a continuous strip.

First, as shown in FIG. 2A, the injection mold includes a mold Ma having a runner (runner) and a gate (gate) communicating with the injection nozzle, and a suction hole 4 in the cavity surface.
A pair of molds Mb having the number 1 and also serving as a sheet preform is used. These molds are made of metal such as iron or ceramics. Both molds Ma and Mb in the mold open state
The decorative sheet S is supplied in between, and the decorative sheet S is fixed to the mold Mb by pressing it with a sheet clamp 42 having a frame shape in plan view. At this time, the side of the second resin base sheet (relative to the first resin base sheet) of the decorative sheet naturally faces the injection resin side on the right side in the drawing. Next, the decorative sheet is appropriately heated and softened by a heater (not shown) inserted between both molds. The heating is, for example, non-contact radiation heating, but may be conduction heating by contact. Then, the decorative sheet is sucked through the suction hole and vacuum formed, and the decorative sheet is preformed along the cavity surface of the mold Mb. 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 by cooling or the like, the mold is opened and the molded product is taken out. Then, if the unnecessary portion of the decorative sheet is trimmed appropriately, the decorative sheet is laminated on the resin molded product to obtain a decorative molded product having a configuration.

[Injection Resin] In the simultaneous decorating method for injection molding of the present invention, the resin to be injection-molded is not particularly limited, and may be a known resin. What is necessary is just to select according to the required physical properties of a product, cost, etc. If it is a thermoplastic resin, it may be an ABS (acrylonitrile-butadiene-styrene copolymer) resin, a styrene resin, an acrylic resin, a vinyl chloride resin, a polycarbonate resin, a polyolefin resin, or the like. In the case of a curable resin, it is a two-liquid curable resin, for example, an uncured resin liquid such as a urethane resin, an unsaturated polyester resin, or an epoxy resin. The thermoplastic resin is melted by heating and injected in a fluid state, and the curable resin (the uncured product) is injected in a flowing state at room temperature or appropriately heated. Note that, as the injection resin, a resin colored by adding a coloring agent may be used as appropriate depending on the application. As the coloring agent, a known coloring agent as described above for the decorative layer may be used. In addition, the injection resin contains, as necessary, various known additives such as silica, alumina, talc, calcium carbonate, inorganic powders such as aluminum hydroxide, fillers such as glass fibers, stabilizers, and lubricants. .

Decorative molded article: In the decorative molded article of the present invention, at least a transparent acrylic resin-free second resin base sheet without a matting agent and a matting agent are added to the resin molded article. By laminating a fluororesin surface matte and transparent first resin base sheet in this order, the surface is a molded product decorated with a matte design. The decorative molded article of the present invention having such a configuration can be obtained by, for example, suitably laminating the decorative sheet of the present invention on a resin molded product. In addition, as the lamination method, for example, the above-described simultaneous injection molding decoration method of the present invention can be used. Of course, the decorative molded article of the present invention can be made of another material (for example, the first resin base sheet and the second resin base sheet) without using the decorative sheet of the present invention described above or the simultaneous injection molding and decorating method of the present invention. The resin base sheet and the resin base sheet are separately laminated on a resin molded product), or a product produced by another method (for example, a vacuum molding lamination method) may be used. However, it is a matter of course that the injection molding simultaneous decorating method of the present invention produces the molding and the decorating simultaneously by one.
It is preferable because it can be formed in a process and the production efficiency is good.

The decorative molded product P of the present invention illustrated in the cross-sectional view of FIG. 3 is an example of one embodiment of the present invention, and an adhesive layer 5, a decorative layer 4, a second resin The molded article has a configuration in which the base sheet 2 and the first resin base sheet 1 are laminated in this order. Each layer on the resin molded product 6 has a configuration in which, for example, the decorative sheet S in FIG. 1 is laminated.

The resin of the resin molded product 6 is the injection resin or the like described in the injection molding simultaneous decoration method of the present invention, and the second resin base sheet 2 and the first resin base sheet 1 are the same as those of the present invention. Since the decorative sheet is the base sheet described above, further description is omitted here. Note that, similarly to the decorative sheet of the present invention, the decorative molded article of the present invention also
As exemplified in the above, a configuration may be adopted in which other layers such as a decoration layer and an adhesive layer are further provided as necessary.

The decorative molded product is usually a three-dimensional object in which the laminated surface of the decorative sheet is non-planar with an uneven surface or the like. However, the decorative molded article of the present invention does not exclude a three-dimensional object in which the decorative sheet has a flat stacking surface but other surfaces are non-planar, and a plate-like object in which the stacking surface is flat.

[0043]

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

Example 1 A decorative sheet S having the structure shown in FIG. 1 was produced as follows. A resin composition obtained by adding 20 parts by mass of silica particles having an average particle size of 3 μm as a matting agent a to 100 parts by mass of a transparent fluororesin made of polyvinylidene fluoride and a polymethyl methacrylate-based transparent acrylic resin are melted. Extrude the first 10 μm thick
Resin base sheet 1 and 90 μm thick second resin base sheet 2
Was melt-bonded to obtain a base sheet 3. Next, on the surface of the base sheet 3 on the side of the second resin base sheet 2, a decorative layer 4 expressing a wood grain pattern is formed by gravure printing of three colors, and an acrylic resin and vinyl chloride-vinyl acetate are further formed. An adhesive layer 5 having a thickness of 4 μm consisting of a copolymer and a 1: 1 mass ratio was
A decorative sheet was obtained by forming the entire surface by color gravure printing. The ink used for forming the decorative layer used was an acrylic resin as a binder resin as a main component and an ink containing isoindolinone yellow, quinacridone red and carbon black as main components as a coloring agent. For the adhesive layer, the first color used was an ink to which a coloring agent mainly containing titanium white, isoindolinone yellow and quinacridone red was added, and the second color was an ink containing no coloring agent. Each color of the adhesive layer has a thickness of 2 μm.

The decorative sheet is laminated on the surface of the resin molded article simultaneously with the molding of the resin molded article by the simultaneous injection molding and decorating method of the present invention as shown in the conceptual diagram of FIG. A decorative molded product P of the present invention having a configuration was obtained. In addition,
The injection molding simultaneous decorating method was performed in such a manner that a female mold for injection molding was used as a vacuum mold, a decorative sheet was inserted between the molds, then heated and softened, and preformed by vacuum molding. In the preforming of the decorative sheet, after heating to a sheet temperature of 110 ° C. by infrared radiation heating, the decorative sheet was made to follow the female mold cavity surface by vacuum suction from the female mold side. Then, injection resin temperature 2
A heat resistant ABS resin (heat resistant temperature: 95 ° C.) was injected at 40 ° C. under a condition of a mold temperature of 70 ° C., and the decorative sheet was integrated with the resin molded product to form a decorative molded product. The injection mold had a mirror-finished cavity surface and a width of 40 mm and a length of 4 mm.
A mold for forming a vehicle interior panel of 00 mm was used.

During decorating simultaneously with injection molding, there are no wrinkles or tears in the decorative sheet, and the appearance of the obtained decorative molded product has a matte surface of the wood grain pattern, and the wood grain pattern looks white. No whitening was observed.

Comparative Example 1 In Example 1, 20 parts by mass of a silica particle having an average particle size of 3 μm as a matting agent was used as a matting agent with respect to 100 parts by mass of a polymethyl methacrylate-based transparent acrylic resin. A decorative sheet was produced using a 125 μm thick resin sheet formed from a resin composition to which was added. However, this decorative sheet has a matte effect that is too strong, the grain pattern looks white due to the whitening of the base sheet, and the design appearance is poor, and it is judged that evaluation up to further trial production of molded articles is unnecessary. .

Comparative Example 2 In Example 1, 20 parts by mass of a silica particle having an average particle size of 3 μm as a matting agent was used as a matting agent with respect to 100 parts by mass of a polymethyl methacrylate-based transparent acrylic resin. A decorative sheet was prepared using a resin sheet having a thickness of 30 μm formed from a resin composition to which was added, and a decorative molded article was prepared by decorating simultaneously with injection molding. As a result, no whitening of the grain pattern due to the base sheet was observed. However, when decorating with injection molding,
Due to the resin pressure of the injection resin, the decorative sheet was stretched and wrinkled.

[0049]

(1) According to the decorative sheet of the present invention, a matte design can be provided without causing molding defects (wrinkles and tears), deterioration in moldability, and loss of matte feeling. In addition, since the sheet is matte, the decorating sheet itself is not whitened, the transparency is maintained, and the matte sheet can be decorated with transparency. In addition, if this decorative sheet is applied to simultaneous decoration by injection molding, a matte design can be provided by the decorative sheet itself, so that the cost of the injection molding die is lower than when a matte surface is formed by the injection molding die. The matte design can be provided by avoiding the rise. (2) According to the simultaneous injection molding decoration method of the present invention,
The effect of the decorative sheet of the present invention can be obtained, the cost of the injection mold increases, molding defects (wrinkles and tears), moldability decreases,
A matte design having transparency can be provided without causing loss of matte feeling and whitening. (3) Further, according to the decorative molded product of the present invention, the effect of the decorative sheet or the simultaneous injection molding and decorating method can be enjoyed. That is, a matte design having transparency can prevent increase in cost of the injection mold, poor molding (wrinkles and tears), decrease in moldability, loss of matte feeling, and whitening (decrease in transparency) which occur during manufacturing. It becomes a molded product.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating one embodiment of a decorative sheet of the present invention.

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

FIG. 3 is a cross-sectional view illustrating one embodiment of the decorative molded product of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 First resin base sheet 2 Second resin base sheet 3 Base sheet 4 Decorative layer 5 Adhesive layer 6 Resin molding 41 Suction hole 42 Sheet clamp a Matting agent Ma Injection mold (male) Mb Injection molding Mold (female mold) P Decorative molded product S Decorative sheet

 ──────────────────────────────────────────────────続 き Continuing on the front page F term (reference) 4F100 AA20H AK15G AK17A AK19 AK22G AK25B AK25G AL01G AR00D BA02 BA04 BA07 BA10A BA10D CA30A DE01H EH20 EH362 HB00 HB00C HB01C HB31C JL02 JL11AA JA02 A03A12 AM28 JA07 JB13 JF05 JL02 JN25

Claims (3)

[Claims] 1. A decorative sheet for molding, comprising, in order from the surface, a matte and transparent first resin base sheet made of a fluororesin to which a matting agent is added, and an acrylic resin without a matting agent. A decorative sheet comprising a laminate obtained by laminating a transparent second resin base sheet. 2. The decorative sheet according to claim 1, wherein
With the resin substrate sheet side facing the injection resin side and inserted between the male and female molds, the molds are clamped, and the resin in the fluid state is injected into the cavity formed by the molds, , After solidifying, a mold is opened to obtain a decorative molded product in which the decorative sheet is laminated on the surface of a resin molded product. 3. A transparent second resin base sheet of an acrylic resin without a matting agent on a resin molded product,
A decorative molded product formed by laminating a matte and transparent first resin substrate sheet of a fluororesin to which a matting agent has been added in this order.