JP2003191398A - Decorating sheet and method for simultaneous decorating and injection molding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stably manufacturable decorating sheet with which inferiority of printing wherein a printing ink draws a line is not generated when a picture pattern ink layer is formed on a surface base sheet comprising an acrylic resin and in addition, variability with time and the like are not generated when the picture pattern ink layer is formed. <P>SOLUTION: The decorating sheet 1 is constituted by laminating a transparent resin layer 3 comprising a mixture of an acrylic resin and a vinyl chloride-vinyl acetate copolymer and a picture pattern ink layer 4 comprising a binder resin of an acrylic resin and a vinyl chloride-vinyl acetate copolymer and a coloring agent in this order on the back surface of the surface base sheet 2 comprising the transparent acrylic resin. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative sheet, particularly a decorative sheet suitable for an injection molding simultaneous decoration method, and an injection molding simultaneous decoration method.

[0002]

2. Description of the Related Art Decorative sheets have been widely used for the purpose of decorating the surface of products such as injection molded products. As such a decorative sheet, for example, as described in Japanese Patent No. 3017107, the surface of the acrylic resin composed of a homo- or copolymer of acrylic ester or methacrylic ester having a dynamic friction coefficient of 0.2 to 0.9. It is known that a pattern ink layer formed by adding a pigment to a binder resin mixture of an acrylic resin and a vinyl chloride-vinyl acetate copolymer is directly formed on the back surface of a base sheet by printing.

It is said that the above decorative sheet can provide a decorative molded article having high scratch resistance without providing a hard coating film on the surface base material sheet made of acrylic resin (without lowering moldability). It is a thing.

[0004]

However, the above-mentioned decorative sheet has a problem that when a pattern ink layer is formed on a surface base material sheet made of an acrylic resin at the time of its production, the printed pattern is streaked or swims. However, there is a problem in that it may occur, resulting in defective printing. This is because the acrylic resin sheet has poor surface wettability, which makes it difficult for the printing ink in the pattern ink layer to ride.

Therefore, an attempt was made to perform corona discharge treatment on the printed surface of the surface base material sheet made of acrylic resin in advance, and then print the pattern. As a result, it has been found that the above-mentioned defect that the printing ink causes streaks is improved. However, the effect of corona discharge treatment disappears over time.
Therefore, there is a problem in that the effect of improving the defect that lines are streaked at the time of printing depending on the time interval between the corona discharge treatment step and the printing step and the humidity is also unstable and causes variations.

Further, adding a pretreatment such as a corona discharge treatment to the surface base material sheet in advance has a problem that the number of treatment steps is increased in addition to the printing step.

The present invention has been made in order to solve the above-mentioned drawbacks of the prior art. When a pattern ink layer is formed on a surface base material sheet made of an acrylic resin, a printing defect such as a streak of printing ink may occur. An object of the present invention is to provide a decorative sheet that does not occur, does not cause variations over time when forming a pattern ink layer, can be stably manufactured, and has a simple manufacturing process.

[0008]

The present invention provides (1) a transparent resin comprising a mixture of an acrylic resin containing no coloring agent and a vinyl chloride-vinyl acetate copolymer on the back surface of a surface base sheet made of a transparent acrylic resin. Layer, and a decorative ink sheet comprising a pattern ink layer composed of an acrylic resin, a vinyl chloride-vinyl acetate copolymer binder resin, and a colorant, laminated in this order, and (2) further adhering to the back surface of the pattern ink layer. The decorative sheet according to the above (1), which is formed by laminating an agent layer, (3) The above (1) or (2), which is formed by further laminating a back surface base sheet on the back surface of the pattern ink layer or adhesive layer. Decorative sheet, (4) (1) ~
(3) The decorative sheet described above is inserted between the male and female molds of the injection molding machine so that the surface base material sheet side faces the side opposite to the injection gate, and then both molds are engaged and clamped, then both Injection molding characterized by injection-filling a fluid resin into a cavity formed between molds and then solidifying, then opening both molds to obtain a resin molded product in which a decorative sheet is laminated and integrated on the surface The main point is the simultaneous decoration method.

[0009]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail below with reference to the drawings. As shown in FIG. 1, the decorative sheet 1 of the present invention has a transparent resin layer 3 made of a mixture of an acrylic resin and vinyl chloride-vinyl acetate copolymer, on the back surface of a surface base material sheet 2 made of a transparent acrylic resin, and A pattern ink layer 4 comprising an acrylic resin, a binder resin of vinyl chloride-vinyl acetate copolymer, and a colorant is laminated in this order. In the present invention, the "surface" of the surface decorative sheet
In the state where the decorative sheet is decorated on the surface of a molded article or the like, it means the side exposed on the outer surface and touching the eyes of an observer.
1A to 1C, the upper side is the front side and the lower side is the back side.

A transparent resin layer 3 obtained by coating and printing an acrylic resin containing no pigment and a transparent resin made of vinyl chloride-vinyl acetate copolymer on the surface of the surface base material sheet 2 made of acrylic resin on which the pattern ink layer 4 is formed. By forming, the wettability is improved. Specifically, the wetting index can be set to 40 dyn / cm ² or more. On the transparent resin layer 3 having good wettability, the same resin as the transparent resin layer 3 is used as a binder resin, and the pattern ink layer 4 is formed by printing with an ink formed by adding a coloring agent to the binder resin. There is no problem of streching or swimming in the pattern. The transparent resin layer 3 can be easily formed by means such as coating or printing. Further, the transparent resin layer is chemically stable, and the composition does not change over time and the wettability does not deteriorate.

In the decorative sheet of the present invention, an adhesive layer 5 may be further formed on the back surface of the pattern ink layer 3 as shown in FIG. 1 (B). Further, as shown in FIG. 1 (C), a backside base material sheet 6 can be further laminated on the backside of the adhesive layer 5. Alternatively, although not particularly shown, an adhesive layer may be formed on the back surface of the pattern ink layer 4 of the decorative sheet shown in FIG. 1 to form the decorative sheet.

The transparent acrylic resin used for the surface base sheet 2 is, for example, polymethyl (meth) acrylate, polybutyl (meth) acrylate, methyl (meth) acrylate-butyl (meth) acrylate copolymer, methyl (meth) acrylate. -Acrylic resins such as ethyl (meth) acrylate copolymer and methyl (meth) acrylate-styrene copolymer [wherein (meth) acrylate means acrylate or methacrylate). ] Alone or 2
A mixture of more than one species is used.

The surface base sheet 2 has a transparent acrylic resin, a hydrocarbon-based lubricant, and a hydrocarbon-based lubricant in order to impart good scratch resistance.
It is preferable to add a lubricant such as a fatty acid lubricant. However,
If too much lubricant is added, the sheet will slip in the mold during simultaneous injection molding and decoration, and wrinkles, distortions, and the like will easily occur. Therefore, it is preferable to add the lubricant so that the dynamic friction coefficient of the surface of the surface base material sheet becomes 0.2 to 0.9. For example, the amount added is 0.1 to 0.5 mass%.

A weather resistance additive may be added to the surface base sheet 2. As the weather resistance additive, it is preferable to add an ultraviolet absorber such as benzotriazole-based, benzophenone-based, and particulate cerium oxide, and / or a light stabilizer such as a hindered amine-based radical scavenger. The addition amount of each of the ultraviolet absorber and the light stabilizer is usually about 0.1 to 0.5% by mass.

The surface base sheet 2 may be a single layer or a transparent acrylic resin sheet of a laminate of two or more layers. Further, the transparent in the surface substrate sheet 2 is colorless and transparent, and includes a colored transparent by appropriately adding a known colorant as necessary, and is transparent enough to show the transparent resin layer and the pattern ink layer as the lower layer. Anything is good, including translucent.

The thickness of the surface base material sheet 2 is not particularly limited, but it is usually formed to be about 20 to 300 μm. From the viewpoint of ensuring the weather resistance and wear resistance of the surface of the decorated product,
The thickness is preferably 30 μm or more, more preferably 50 μm or more.

If desired, the surface base sheet 2 may be previously subjected to corona discharge treatment on the side on which the transparent resin layer 3 is formed.

The transparent resin layer 3 is composed of a mixture of an acrylic resin and a vinyl chloride-vinyl acetate copolymer and contains no colorant. The thickness is formed to 1 to 10 μm. As the acrylic resin, the acrylic resin exemplified in the description of the surface base material sheet is used. As the vinyl chloride-vinyl acetate copolymer, one having a vinyl acetate content of about 5 to 20 mass% and an average degree of polymerization of about 350 to 900 is usually used. Further, vinyl chloride-vinyl acetate copolymer, if necessary,
Further, those obtained by copolymerizing carboxylic acids such as maleic acid and fumaric acid may be used.

The transparent resin layer 3 can be formed by coating the surface of the surface base material sheet 2 with a coating composition comprising the above-mentioned specific resin by various known coating means. Examples of the coating means include roll coating, gravure roll coating, spray coating and comma coating. Further, the transparent resin layer 3 formed in advance may be adhesively laminated with the surface base material sheet 2 by heat fusion, dry lamination or the like. Alternatively, the transparent resin layer 3 and the surface base material sheet 2 may be formed by coextruding two layers in a molten state.

The pattern ink layer 4 is formed by adding a colorant to a binder resin (not necessarily the same as the transparent resin layer 3) selected from the same resins as the transparent resin layer 3. The colorant may be a known dye or pigment, for example, inorganic pigments such as titanium white, carbon black, sage, yellow lead, cobalt blue, etc., organic pigments such as aniline black, phthalocyanine blue, isoindolinone, quinacridone, etc., aluminum foil powder. And the like, pearlescent pigments such as titanium dioxide-coated mica, and other dyes can be used.

The pattern ink layer 4 is basically a layer containing a colorant using a mixed resin of an acrylic resin and a vinyl chloride-vinyl acetate copolymer as a binder resin, and is basically not limited in any other points. , And other additives may be added. The design of the design ink layer is wood grain, stone grain,
Texture, grain, leather pattern, geometric pattern, letters, symbols, solid surface, etc. are optional. Further, the pattern ink layer 4 may be a functional layer such as a conductive layer in which a conductive powder such as silver powder is dispersed in a binder, in addition to a layer for the purpose of decoration such as a grain pattern.

The pattern ink layer 4 can be formed by a known printing method or coating method, usually in the form of printing ink or paint by mixing the binder resin and the colorant. The coating method can be used for all solid patterns.

The adhesive layer 5 is made of a two-component curing type urethane resin. Specifically, it is a urethane resin containing a polyol as a main component and an isocyanate as a crosslinking agent (curing agent).
The polyol has two or more hydroxyl groups in the molecule, and for example, polyethylene glycol, polypropylene glycol, acrylic polyol, polyester polyol, polyether polyol, polycarbonate polyol, polyurethane polyol and the like are used.
Further, as the isocyanate, a polyvalent isocyanate having two or more isocyanate groups in the molecule is used. For example, 2,4-tolylene diisocyanate, xylene diisocyanate, aromatic isocyanate such as 4,4'-diphenylmethane diisocyanate, or 1,6-hexamethylene diisocyanate, isophorone diisocyanate, hydrogenated tolylene diisocyanate, hydrogenated diphenylmethane diisocyanate, etc. It is also possible to use the aliphatic (or alicyclic) isocyanate, or an adduct of the above-mentioned various isocyanates, or a multimer. For example, there are tolylene diisocyanate adducts, tolylene diisocyanate trimers, and the like.

The adhesive layer 5 may be formed by a known printing method or coating method using an adhesive agent using the above two-component curing type urethane resin as an ink or a coating liquid. The thickness of the adhesive layer 6 is not particularly limited, but is, for example, about 5 to 20 μm.

Incidentally, in forming the adhesive layer 5, as shown in FIG.
In the embodiment shown in, the surface to which the adhesive is applied is the pattern ink layer 4
It may be provided on either side, the backside base material sheet 6 side, or both of them.

The backside base sheet 6 is made of polyolefin resin, polyester resin, polycarbonate resin, polystyrene, AS (acrylonitrile-styrene copolymer), ABS resin (acrylonitrile-butadiene-styrene copolymer), polyvinyl chloride, etc. One type of these or a mixture of two or more types is used.

The above-mentioned polyolefin resin is, for example, a highly crystalline non-polymer such as polyethylene (low density or high density), polypropylene, polymethylpentene, polybutene, ethylene-propylene copolymer and propylene-butene copolymer. Elastomer Polyolefin resin or various olefin thermoplastic elastomers are used.
These polyolefin resins may be used alone or in combination of two or more.

If desired, various additives such as flame retardants, lubricants, antioxidants, ultraviolet absorbers, light stabilizers, and fillers may be added to the back surface base sheet 6. For example, aluminum hydroxide, magnesium hydroxide or the like is used as the flame retardant. A benzotriazole type, a benzophenone type, or the like is used as the ultraviolet absorber. A hindered amine radical scavenger or the like is used as the light stabilizer. As the filler, for example, extender pigments such as mica, talc, calcium carbonate, barium sulfate, silica, alumina and kaolinite are used.

By adding a coloring agent to the backside base sheet 6, the backside base sheet is provided with a color hiding property so as to hide the color of a molded article or the like on which the decorative sheet 1 is laminated, and a pattern. The base color of the ink layer 4 can also be adjusted. As this colorant, a known colorant as exemplified in the above description of the pattern ink layer can be used.

The backside base sheet 6 may have a multi-layer structure such as two layers. For example, in the case of a two-layer structure, the two layers may be directly laminated by heat fusion, but may be laminated with an adhesive layer between the layers. In this case, for the adhesive layer, the two-component curing type urethane resin used for the adhesive layer 5 can be used. Also, in order to have a multilayer structure such as two layers without interposing an adhesive layer between layers,
For example, it may be laminated at the same time as film formation by a co-extrusion method using a T die. In addition, for laminating via the adhesive layer, for example, it may be laminated by a dry lamination method.

The back substrate sheet 6 is formed to have a thickness of about 80 to 300 μm. In this case, the total thickness of the decorative sheet 1 is 100 to 60.
It is formed to about 0 μm. Decorative sheet 1 thickness (total thickness)
When performing preforming with a mold different from the injection mold, it is necessary to remove the mold from the preforming mold and to secure the strength and shape retention for mounting on the injection mold. Thick 300
~ 600 μm. Also, when the preforming die is also used as the injection molding die, there is no concern about shape retention and breakage during demolding.
Relatively thin 100-300 μm.

The decorative sheet 1 of the present invention, as shown in FIG.
On the surface of the molded product 7 or the like, the decorative sheet 1 is laminated so that the surface base material sheet side of the decorative sheet 1 is the outer surface to form the decorative molded product 8 or the like.

In particular, the decorative sheet of the present invention is optimally used in the simultaneous injection-molding decorative method. The injection-molding simultaneous decorating method of the present invention using the decorating sheet will be described below. Figure
3 (A) to (C) are process diagrams for explaining the simultaneous injection-molding and decorating method of the present invention.In this form, the injection-molding die is a separate vacuum-forming die to heat and soften the decorating sheet. After the pre-molding, the pre-molded decorative sheet is inserted into the injection molding die, the mold is clamped, and the resin is injected to perform the off-run pre-molding.

In the injection molding simultaneous decoration method, as shown in FIG. 3 (A), first, a vacuum forming die 32 having a suction means such as a suction hole 31 on a die surface was used and heated and softened by a heater 33. Decorative sheet
Preform 1 by vacuum forming. The vacuum mold 32
Is made of metal such as iron or aluminum, or ceramics. The decorative sheet 1 is appropriately fixed by a frame-shaped sheet clamp 34. At this time, the surface base material sheet 2 side of the decorative sheet 1 is oriented in a direction opposite to the injection resin side (downward in the drawing). Further, the heating and softening by the heater 33 shown in FIG. 3 (A) is, for example, non-contact radiant heating, but may be conductive heating by contact. Then, in the pre-forming, the decorative sheet 1 is sucked from the suction holes 31 to be vacuum-formed along the surface of the vacuum forming die 32.

Next, the preformed decorative sheet 1 is
As shown in FIG. 3 (B), a female die 35a and a male die 35b of the injection molding die.
Supply between and. Here, the female mold 35a of the injection mold has a cavity surface that is the same as or substantially the same as the mold surface of the preforming mold 32, and serves as a mold for fixing the preformed decorative sheet 1, and is a male of the injection molding mold. The mold 35b has a runner and a sprue (injection gate 36) communicating with the injection nozzle. These molds are made of metal such as iron or ceramics.

The decorative sheet 1 has two molds 3 in the mold open state.
Inserted so that the surface base material sheet 1 side faces the side opposite to the injection gate 36 (female mold 35a side on the left side in the drawing) between 5a and 35b, and is fixed by pressing with a frame-shaped sheet clamp 37 or the like. . Then, as shown in FIG. 3 (C), the two molds 35a, 35b are engaged, the molds are clamped, and the resin 38 in a fluidized state such as a heated and melted state is injected and filled into the cavity formed between the two molds, Allow to solidify by cooling, etc., then open both molds. If there is an unnecessary part of the decorative sheet 1, trim it as appropriate
As shown in 2, a resin molded product 8 in which the decorative sheet 1 is laminated and integrated on the surface of the molded product 7 is obtained.

The injection-molding simultaneous decorating method may be a form in which the decorating sheet 1 is preformed, a form in which it is not preformed, a form in which the decorating sheet 1 is preheated, or a form in which it is not preheated. The decorative sheet 1 is usually preheated during preforming. When the decorative sheet has a large drawing, it is preferable to perform preforming. On the other hand, when the decorative sheet has a small drawing (shallow), the decorative sheet may be molded by resin pressure of the resin in a fluid state filled in the mold at the same time as resin injection without preforming. When the decorative sheet is molded with this resin pressure, the heat of the injection resin can be used without preheating the sheet.

The method shown in FIGS. 3A to 3C is a method of performing preforming (offline preforming) using a vacuum forming die other than the forming die. Alternatively, the method may be used in combination. The form in which the injection molding die is also used as the vacuum molding die as the preforming is preferable because it is efficient and the decorative sheet can be accurately laminated on the formed body, but the offline preforming is preformed. It is preferable when the decorative sheets are collectively manufactured in advance at another place. In the present invention, vacuum forming also includes vacuum pressure forming.

As the above injection molding resin, conventionally known resins used in the simultaneous injection molding and decorating method can be used and are appropriately selected according to the required physical properties of the product, the cost and the like. In particular, a decorative sheet 1 having a backside base sheet 6 {Fig. 1 (C)
In this case, it is preferable to use the same type of resin for the injection-molded resin and the backside base material sheet in terms of adhesion and the like. Injection molding resin is, for example, ABS (acrylonitrile
Butadiene / styrene copolymer) resin, AS (acrylonitrile / styrene copolymer) resin, polystyrene, polyvinyl chloride, polyolefin resin, acrylic resin, polycarbonate resin, and other thermoplastic resins are heated and melted into a liquid or fluid state. Or a two-component curing type or catalyst curing type resin, for example, an uncured liquid such as urethane resin or polyester resin.

The injection-molded resin contains no colorant,
The resin molded product 7 may be formed to be colorless and transparent, but normally,
A colorant is added in order to impart a concealing property and a desired color tone to the decorative molded article itself. This colorant
Titanium white, Antimony white, Carbon black, Iron black, Rouge, Cadmium red, Ultramarine, Cobalt blue, Yellow lead,
Inorganic pigments such as titanium yellow, phthalocyanine blue,
Organic pigments such as induslen blue, isoindolinone yellow, benzidine yellow, quinacridone red, and polyazo red, metal pigments consisting of scale-like foil pieces such as aluminum and brass, pearl luster consisting of scale-like foil pieces such as titanium dioxide-coated mica ( Pearl) pigment, dye, or the like is used.

The decorative sheet of the present invention can be laminated on molded products of various shapes and various materials which have already been molded by the following methods (i) to (iv). (i) A method in which a decorative sheet is laminated by pressing it with a pressure roller on a plate-shaped substrate with an adhesive layer interposed therebetween. (ii) As described in JP-B-56-45768, JP-B-60-58014, etc., a decorative sheet is placed on the surface of a molded product so as to face or be placed with an adhesive layer in between, and molded. A so-called vacuum press laminating method in which a decorative sheet is adhesively laminated on the surface of a molded product by a pressure difference caused by vacuum suction from the product side. (iii) As described in Japanese Examined Patent Publication No. 61-5895, Japanese Examined Patent Publication No. 3-2666, etc., an adhesive layer is provided between the decorative sheets in the long axis direction of a columnar substrate such as a column or a polygonal column. While supplying via
A so-called lapping method in which a decorative sheet is sequentially pressure-bonded and laminated on a plurality of side surfaces forming a columnar body by a plurality of rollers having different directions. (iv) As described in Japanese Utility Model Publication No. 15-31122, JP-A-48-47972, etc., first, a decorative sheet is laminated on a plate-shaped substrate via an adhesive layer, and then a plate-shaped sheet. The surface of the base material opposite to the decorative sheet reaches the interface between the decorative sheet and the plate-shaped base material,
A so-called V-cut or U-cut processing method in which a V-shaped or U-shaped cross section is cut, and then an adhesive is applied to the groove, and then the outer groove is bent to form a box or columnar body. .

The decorative molded article obtained by laminating the decorative sheet of the present invention is an exterior material, interior or exterior material of a building, furniture,
It can be used for various purposes such as fittings, fabrication members (waist wall, skirting boards, rims, etc.), containers, housings for home electric appliances, OA equipment and the like.

[0043]

Example 1 A transparent polymethylmethacrylate-based acrylic resin sheet (having a dynamic friction coefficient of 0.45 with 0.2% by mass of an aliphatic alcohol-based lubricant added) having a thickness of 125 μm was prepared as a surface base sheet. On the back surface of the surface base material sheet, a paint consisting of a mixture of acrylic resin containing no colorant and vinyl chloride-vinyl acetate copolymer in a ratio of 5 to 5 by mass was gravure roll-coated to give a transparent film having a thickness of 2 μm when dried. A resin layer was formed. Then, a marble pattern ink layer was formed on the transparent resin layer by gravure printing. The composition of the pattern ink is isoindolinone yellow, quinacridone red, in the binder resin composed of the paint used for the transparent resin layer.
What added the pigment which consists of phthalocyanine blue as a coloring agent was used. Thus, a decorative sheet having a structure (cross-sectional view) as shown in FIG. 1 (A) was obtained.

Example 2 On the back surface of the decorative sheet of Example 1, that is, on the pattern ink layer,
4 pairs of acrylic resin and vinyl chloride-vinyl acetate copolymer
An adhesive layer made of a mixture of 6 mass ratio was formed by gravure roll coating to have a thickness of 4 μm (when dried). Thus the figure
A decorative sheet having a configuration (cross-sectional view) such as 1 (B) was obtained.

Example 3 On the back surface of the decorative sheet of Example 2, that is, on the adhesive layer, a thickness of 2
00 μm ABS resin sheet {(acrylonitrile / butadiene /
The back side base material sheet consisting of (styrene) mass ratio = 60/20/20} was laminated by heat fusion. Thus, a decorative sheet having a structure as shown in FIG. 1 (C) was obtained.

Comparative Example 1 In Example 1, except that the formation of the transparent resin layer was omitted and the pattern ink layer was directly formed on the surface base material sheet,
A decorative sheet of Comparative Example 1 was obtained in the same manner as in 1.

[Evaluation of Decorative Sheet] (i) The quality of the design was evaluated by visually observing the design of the design ink layer of each of the decorative sheets of Examples 1 to 3 and Comparative Example 1 above.
The results are shown in the table below.

[Table 1]

(Ii) Simultaneous injection molding decoration test Using the decorative sheets of Examples 1 to 3, injection molding simultaneous decoration as shown in FIGS. 3 (A) to (C) was performed. Figure 3 (A) for each decorative sheet
Insert into a vacuum forming die made of steel and having a suction hole connected to a vacuum pump as shown in Fig. 3, fix the sheet peripheral edge with a sheet clamp, and heat and soften the decorative sheet with an infrared radiation heater. The decorative sheet was sucked from the suction suction hole and vacuum-molded to form the decorative sheet on the surface shape of the vacuum forming mold, and the decorative sheet was cooled to room temperature (preforming). Next, as shown in FIG. 3 (B), the formed decorative sheet taken out from the vacuum forming die is mounted in both male and female injection molds made of steel, both molds are engaged and clamped, and then, FIG. As shown in C)
The ABS resin melted from the (gate) was injected and filled in the mold cavity (cavity) between the male and female molds, and then cooled and solidified. Then
Both molds were opened to obtain a decorative molded product as shown in Fig. 2 in which a decorative sheet was bonded and laminated on the surface of the resin molded product. The obtained decorative molded product was good without tearing or wrinkling of the decorative sheet during vacuum forming (preforming) and injection molding, and free from defects such as streaks and swimming in the pattern.

[0049]

As described above, the present invention provides a transparent resin layer made of a mixture of an acrylic resin containing no coloring agent and a vinyl chloride-vinyl acetate copolymer on the back surface of a surface base sheet made of a transparent acrylic resin. , And a pattern ink layer composed of an acrylic resin, a binder resin of vinyl chloride-vinyl acetate copolymer, and a colorant, which are laminated in this order, so that the transparent resin layer with good wettability can be transparent. Since it is possible to print the pattern ink layer using an ink consisting of the same acrylic resin as the resin layer and a binder resin of vinyl chloride-vinyl acetate copolymer, it is necessary to draw lines or swim when printing the pattern ink layer. It is possible to form a good pattern ink layer without causing such problems.

Further, since the transparent resin layer can be easily formed by means such as coating or printing, the transparent resin layer is chemically stable and its composition does not change with time. It is possible to stably produce a decorative sheet of good quality without the risk of variations as in the case of performing corona discharge treatment. Furthermore, steps such as corona discharge treatment can be omitted.

When a decorative sheet is formed by further laminating an adhesive layer on the back surface of the pattern ink layer, the decorative sheet can be easily adhered to a decorated product such as a molded product.

When a backside base material sheet is further laminated on the backside of the pattern ink layer or the adhesive layer to form a decorative sheet, the optimum backside base material sheet is selected according to the type of molded product. Therefore, the adhesiveness can be improved. Further, it is possible to obtain the effects that the decorative sheet is given strength to improve the moldability, and the cost can be reduced by using an inexpensive material.

[Brief description of drawings]

1 (A) to (C) are cross-sectional views showing an embodiment of a decorative sheet of the present invention.

FIG. 2 is a partial cross-sectional view showing an example of a decorative molded product.

3A to 3C are process drawings showing an example of the simultaneous injection-molding and decorating method of the present invention.

[Explanation of symbols]

1 Decorative sheet 2 Surface base material sheet 3 Transparent resin layer 4 Design ink layer 5 Adhesive layer 6 Backside base sheet 7 Resin molded product 8 Decorative molded products 35a female 35b male 36 injection gate

Continued front page    F term (reference) 4F100 AK15B AK15C AK15J AK22B                       AK22C AK22J AK25A AK25B                       AK25C AK74 AL01B AL01C                       AL05B AL05C AR00E AT00A                       BA03 BA04 BA05 BA07 BA10A                       BA10C BA10D BA10E CA13C                       CB00D GB08 GB48 HB31C                       JN01A JN01B                 4F206 AA15E AA18E AA20 AD09                       AD20 AF10 AG03 AH42 AH48                       AH51 JA07 JB13 JB19 JF05                       JF23 JL02 JQ81

Claims (4)

[Claims] 1. A colorant-free acrylic resin and vinyl chloride on the back surface of a surface base sheet made of a transparent acrylic resin.
-A transparent resin layer composed of a mixture with a vinyl acetate copolymer,
And a pattern ink layer comprising an acrylic resin, a binder resin of vinyl chloride-vinyl acetate copolymer, and a colorant, which are laminated in this order. 2. The decorative sheet according to claim 1, wherein an adhesive layer is further laminated on the back surface of the pattern ink layer. 3. The decorative sheet according to claim 1 or 2, wherein a backside base material sheet is further laminated on the back surface of the pattern ink layer or the adhesive layer. 4. The decorative sheet according to claim 1,
Insert between the male and female molds of the injection molding machine so that the surface base material sheet side faces the side opposite to the injection gate, and then engage both molds,
To obtain a resin molded product in which a mold is clamped, and then a resin in a fluid state is injected and filled into a cavity formed between both molds and then solidified, then both molds are opened, and a decorative sheet is laminated and integrated on the surface. Injection molding simultaneous decoration method characterized by.