JPH11277695A - Molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the adhesion of a surface layer in a polyolefin resin molded product having the surface layer formed to the surface thereof for the purpose of surface modification and the decoration of a pattern, a character or the like. SOLUTION: In a molded product, a chlorinated resin base material 2 is laminated on a molded resin base material 1 comprising a molded article of a resin containing two components, that is, a polyolefin resin and an ethylene/ propylene resin so as to come into contact with the molded resin base material and a surface layer 3 comprising a thermoplastic resin layer is further laminated on the layer 2 as the outermost layer directly or through other layer. For example, a surface coating sheet consisting of at least two layers, that is, a surface layer containing an acrylic resin and the chlorinated polyolefin resin layer being a rear surface layer and having a decorative layer 5 comprising an acrylic resin or the like or the urethane resin layer 4 coming into contact with the chlorinated polyolefin resin appropriately provided between two layers is laminated on the molded resin base material simultaneously with the molding of the molded resin base material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic molded product, and more particularly to a molded product made of polyolefin resin, the surface of which is modified or decorated.

[0002]

2. Description of the Related Art Conventionally, molded articles obtained by various molding methods such as injection molding have been used for various purposes. As the molding resin, various resins such as polypropylene resin and ABS have been used depending on the application. In addition, not only a single molded article that is simply molded, but also a large number of molded articles in which patterns and characters are formed on the surface by printing or other various methods to enhance the design property are used. In the case of a molded article having characters or patterns formed on the surface, the formed surface is often non-planar. In such a case, a so-called curved surface printing technique is used. For example, as technology to decorate the surface of the molded product after molding, octopus printing,
Alternatively, there is a hydraulic transfer method. Further, in the simultaneous painting technique of injection molding, characters, patterns, and the like can be provided on the surface of the molded article in one step at the same time as molding.

[0003]

As the molding resin, an inexpensive polyolefin resin such as a polypropylene resin is preferable from the viewpoint of cost and the like. However, since the adhesion is inferior to other resins, the molded product is not suitable. It was difficult to provide letters and patterns on the surface. In general, polyolefin resins are soft and have low surface strength such as scratch resistance, and thus, a molded product alone cannot be used for applications requiring a hard surface. For this reason, polyolefin resin is used as the molding resin, but it is attempted to apply it to various uses by making the surface modified such as improving the surface strength or decorating the molded product. Have been done.

[0004] For example, a molded article obtained by surface-coating a molded article after molding. Molded articles made by this method can be surface-modified such as improving surface strength, but cannot be decorated with characters or patterns. Further, the molded article is a molded article obtained by applying a primer coating on the surface of the molded article after the molding, improving the adhesion, and decorating by a hydraulic transfer method. A molded article by this method can impart a picture or the like, but a letter or the like is easily distorted and is unsuitable. In addition, a primer coating and a top coating after transfer are required two coating steps, resulting in poor production efficiency and a high cost molded product. In addition, in the above and the above, it is also necessary to select a paint that can obtain good adhesion to the polyolefin resin. Alternatively, it is a molded product obtained by laminating a surface covering sheet such as a decorative sheet on the surface of a molded product at the same time as molding of a resin by simultaneous injection molding painting technology (injection molding simultaneous lamination method). In this case, if a surface-coated sheet in which a polyolefin resin sheet is laminated on the back side is used, the adhesion is improved and a molded article in which the surface-coated sheet is laminated can be obtained. However, a step of laminating a polyolefin resin sheet on the back side of the surface covering sheet is required, and the cost of the molded product is increased accordingly.
In addition, the presence of the polyolefin resin sheet in the surface-coated sheet increases the breaking strength at room temperature, and leaves a problem that cutting of the sheet becomes difficult when trimming an extra sheet that protrudes out of the product after lamination.

Accordingly, an object of the present invention is to provide a molded article in which an inexpensive polyolefin resin is used as a molding resin and a layer is formed on the surface of the molded article for any purpose such as surface modification or decoration. The purpose is to provide a molded product with good adhesion. In addition, the molded article can be easily manufactured.

[0006]

In order to solve the above-mentioned problems, a molded article of the present invention comprises a molded resin substrate comprising a molded article of a resin containing two components of a polyolefin resin and an ethylene propylene rubber. A chlorinated polyolefin resin layer in contact with the molded resin substrate is laminated, and a surface layer made of a thermoplastic resin layer is laminated thereon as the outermost layer directly or via another layer. As a result,
By the ethylene propylene rubber contained in the polyolefin resin of the molding resin substrate and the chlorinated polyolefin resin layer laminated in contact with the molding resin substrate, a molded article having a surface layer with good adhesion to the molding resin substrate is obtained. Further, in the above configuration, the surface layer made of the thermoplastic resin layer contains an acrylic resin, and a urethane resin layer in contact with the chlorinated polyolefin resin layer between the surface layer and the chlorinated polyolefin resin layer. In this case, the surface layer is a layer containing an acrylic resin, and the molded article has good adhesion of the surface layer. Since the surface layer is made of an acrylic resin, a molded article having excellent scratch resistance, transparency, weather resistance, and the like on the surface can be obtained.

Another form of the molded article of the present invention is a molded article in which the above-mentioned surface layer and chlorinated polyolefin resin layer are formed particularly from a surface-coated sheet. In addition, a molded article having a configuration in which a surface covering sheet composed of at least two layers including a chlorinated polyolefin resin layer as a back surface layer was laminated on the molded resin substrate at the same time as molding of the molded resin substrate. In this manner, by forming the surface layer simultaneously with the molding of the molded article, the molded article can be formed into a molded article in which the surface layer having good adhesion is laminated on the molded resin substrate and which can be manufactured easily and at low cost. . In the above structure, the surface coating sheet may be made of a urethane which is in contact with the chlorinated polyolefin resin layer between the surface layer and the chlorinated polyolefin resin layer, wherein the surface layer comprising the thermoplastic resin layer contains an acrylic resin. By forming a molded article having a resin layer, the surface layer is a layer containing an acrylic resin, and the molded article has good adhesion to the surface layer. Also,
Since the surface layer is made of an acrylic resin, a molded article having excellent scratch resistance, transparency, weather resistance, and the like on the surface can be obtained.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the molded article of the present invention will be described with reference to the drawings.

[Outline] First, FIG. 1 is a sectional view showing a basic form of a molded article of the present invention, and FIGS. 2 and 3 are sectional views showing another embodiment of the molded article of the present invention. is there. In the molded product M of the basic form shown in FIG. 1, a chlorinated polyolefin resin layer in contact with the molded resin substrate is formed on a molded resin substrate 1 made of a molded product of a resin containing two components of a polyolefin resin and ethylene propylene rubber. And a surface layer 3 made of a thermoplastic resin layer as an outermost layer directly thereon.
Are laminated. The surface layer 3 is a layer provided for surface modification, surface decoration, and the like. Instead of forming the molding resin substrate 1 as a single polyolefin resin, a resin containing two components of a polyolefin resin and ethylene propylene rubber is used.
In addition, the chlorinated polyolefin resin layer 2 is provided as an adhesive layer so as to be in contact with the molding resin substrate 1 and the surface layer 3 is laminated, so that the surface layer for surface modification, surface decoration, etc. Can be formed into a molded product on a molded resin substrate with good adhesion.

Next, when a molded article M shown in FIGS. 2 and 3 uses an acrylic resin for the surface layer, the molded article M is provided between the chlorinated polyolefin resin layer 2 and the surface layer 3. 2 shows a configuration in which a urethane resin layer 4 is provided in contact with. The molded article M in FIG. 2 has a configuration in which a molded resin substrate 1, a chlorinated polyolefin resin layer 2, a urethane resin layer 4, and a surface layer 3 are laminated in this order, and the molded article M in FIG. In the structure of the molded article M, the urethane resin layer 4 and the surface layer 3
This is a specific example in which a decoration layer 5 for expressing characters, pictures, or the like formed with an ink or a coating liquid using an acrylic resin as a binder is interposed between them. As described above, the chlorinated polyolefin resin layer 2 is interposed between the surface layer 3 and the molded resin substrate 1, but is a layer that is always in contact with the molded resin substrate 1. The urethane resin layer 4 is interposed between the chlorinated polyolefin resin layer 2 and the surface layer 3, but is always in contact with the chlorinated polyolefin resin layer 2. The urethane resin layer has a surface layer 3 made of acrylic resin or a decorative layer 5 made of acrylic resin.
And acts as a primer layer for improving the adhesion between the chlorinated polyolefin resin layer 2 and the chlorinated polyolefin resin layer 2.

The entire layer on the molded resin substrate may be formed by a coating method or the like on the molded resin substrate, but is prepared in advance as a surface covering sheet using the surface layer as a substrate sheet. Laminating the surface-coated sheet on a molded resin base material is preferable in that a coating step or the like is unnecessary and a desired molded product can be easily obtained. Moreover, it can be formed into a molded product decorated with patterns, characters, and the like that cannot be obtained by painting. The lamination may be performed by laminating the surface of the molded resin substrate after molding the molded resin substrate (for example, as described in JP-B-56-45768 and JP-B-60-58014). A so-called vacuum press, in which a surface coating sheet is opposed or placed on the surface with an adhesive therebetween, and the surface coating sheet is laminated on the surface of the molding resin substrate by a pressure difference due to vacuum suction from the molding resin substrate side. It is a lamination method).
However, such a method requires two steps, a forming step and a laminating step. However, if the surface covering sheet is laminated at the same time as the molding of the molded resin substrate, a molded product can be obtained in one step, and the molded product is preferable in terms of cost. In order to laminate a surface-coated sheet simultaneously with molding, a so-called simultaneous injection molding simultaneous laminating method in a so-called injection molding simultaneous painting method (Japanese Patent Publication No. 50-19132,
Reference may be made to JP-B-43-27488, etc.). That is, a method in which a surface-coated sheet is disposed between both male and female molds for injection molding, a molten resin is injected and filled into the mold, and a surface-coated sheet is adhered and laminated on the surface of the molded product simultaneously with molding.

Accordingly, the present invention will be described in more detail below mainly on the case where a surface-coated sheet is used.

[Molded Resin Substrate] In the present invention, the molded resin substrate is a molded product composed of a resin containing two components of a polyolefin resin and ethylene propylene rubber. As the polyolefin resin, for example, polyethylene, polypropylene, polybutene, polymethylpentene, ethylene-
A propylene-butene copolymer may be used. The ethylene propylene rubber is a rubber (EPR) composed of an ethylene-propylene copolymer, and is an amorphous random copolymer. Further, in addition to the pure ethylene-propylene copolymer, ethylene is a terpolymer using ethylene and propylene as main monomers and a small amount of diene such as ethylidene norbornene as a third monomer. -Propylene-diene terpolymer (EPD
M) can also be used. In these, the weight ratio of ethylene to propylene is about 80:20 to 20:80. These ethylene propylene rubbers are added in an amount of 1 to 40 parts by weight, more preferably 5 to 30 parts by weight, based on 100 parts by weight of the polyolefin resin.
If the amount is less than 1 part by weight, the effect of improving adhesion cannot be obtained, and in order to sufficiently obtain the effect of improving adhesion, 5 parts by weight or more is preferable. On the other hand, if the amount exceeds 40 parts by weight, the cost becomes high, and the molded resin substrate itself becomes soft and poor in rigidity. Therefore, the addition amount is more preferably 30 parts by weight or less from the viewpoint of cost and rigidity. In the resin serving as the molding resin base material, as necessary, silica, alumina, calcium carbonate, inorganic powders such as aluminum hydroxide, fillers such as glass fibers, coloring agents such as pigments and dyes, Various known additives such as an agent and a lubricant are contained.

[Chlorinated Polyolefin Resin Layer] The chlorinated polyolefin resin layer is made of a chlorinated polyolefin resin such as chlorinated polyethylene and chlorinated polypropylene. By chlorinating the polyolefin resin, it becomes soluble in a solvent, and a layer can be formed by printing or coating as an ink or a coating liquid. The chlorinated polyolefin has good adhesion with the polyolefin resin, and also has good adhesion with other resins such as an acrylic resin. If the thickness of the layer is about 0.5 to 5 g / m ² (solid content) in terms of the coating amount, the effect of improving adhesion can be obtained.

[Surface Layer Consisting of Thermoplastic Resin Layer] The thermoplastic resin used for the surface layer is not particularly limited as long as it is thermoplastic, and may be any suitable for the intended use. In the case of molding with a surface-coated sheet, the surface layer is a layer that becomes a base sheet of the sheet. By forming the surface layer as a thermoplastic resin layer, even when formed from a surface-coated sheet, the sheet can be provided with moldability, and the sheet can be formed not only on a flat surface but also on an uneven surface, and the surface can be formed on a molded resin base material. A layer or the like can be formed. In the case where the surface layer is intended to modify the surface of a molded resin substrate using a polyolefin resin, the gist of the present invention is to use a non-polyolefin resin. But,
If surface modification is not required and decoration with characters or patterns is intended, a polyolefin resin may be used, which is rather preferable from the viewpoint of adhesion to a molding resin substrate. In the case of forming with a surface covering sheet, even if the resin cannot be formed by printing (or coating) of ink (or coating liquid) like the polyolefin resin, the resin can be formed with the surface covering sheet.

The thermoplastic resin used for the thermoplastic resin layer as the surface layer includes, for example, polyvinyl chloride, polyvinylidene chloride, vinyl chloride-vinyl acetate copolymer, polyvinyl fluoride, polyvinyl butyral, polyvinylidene fluoride and the like. Styrene resins such as vinyl resin, polystyrene, acrylic styrene, ABS (acrylonitrile-butadiene-styrene copolymer), polymethyl methacrylate, polyethyl methacrylate, polybutyl methacrylate, methyl methacrylate-butyl methacrylate copolymer , Acrylic resins such as polyacrylonitrile, cellulose resins such as cellulose acetate and nitrocellulose, polyamide resins such as nylon 6, nylon 66, polyethylene terephthalate, polybutylene terephthalate, ethylene terephthalate Isophthalate copolymer thermoplastic polyester resin, polycarbonate, or,
Olefin resins such as polyethylene, polypropylene, ethylene-propylene-butene copolymer, and olefin thermoplastic elastomer. In addition, if the surface layer is a thermoplastic resin layer, it may be a single layer or a multi-layer composed of two or more resins. Therefore, the surface covering sheet is 2 of the resin sheet.
A laminate of more than one kind may be used. The thickness of the surface layer depends on the application,
The thickness is appropriately set according to the purpose.

Among the thermoplastic resins, acrylic resins are preferred resins in terms of improving scratch resistance, transparency, weather resistance and the like. Acrylic resin is also preferable in terms of moldability when forming a surface layer with a surface covering sheet.

[Urethane Resin Layer] The urethane resin layer is interposed between a surface layer made of an acrylic resin or a decorative layer made of an acrylic resin and a chlorinated polyolefin resin layer to facilitate adhesion between the two layers. Acts as a layer. Urethane resin is preferred for improving the adhesion between the layer made of acrylic resin and the chlorinated polyolefin resin layer.
The urethane resin constituting the urethane resin layer is selected from a two-component curable urethane resin, a one-component moisture-curable urethane resin, and a thermoplastic urethane resin.

The two-component curable urethane resin is a urethane resin containing polyol as a main component and isocyanate as a crosslinking agent (curing agent). The polyol has two or more hydroxyl groups in the molecule, and examples thereof include polyethylene glycol, polypropylene glycol, acrylic polyol, polyester polyol, polyether polyol, and polycarbonate polyol. As the isocyanate, a polyvalent isocyanate having two or more isocyanate groups in a molecule is used. For example, aromatic isocyanates such as 2,4-tolylene diisocyanate, xylene diisocyanate, and 4,4'-diphenylmethane diisocyanate, or aliphatic (such as hexamethylene diisocyanate, isophorone diisocyanate, hydrogenated tolylene diisocyanate, and hydrogenated diphenylmethane diisocyanate) Or alicyclic) isocyanate, or an adduct or multimer of the above-mentioned various isocyanates. For example, there are an adduct of tolylene diisocyanate and a trimer of tolylene diisocyanate.

The thermoplastic urethane resin comprises a linear polymer obtained by urethane bonding a divalent polyol and a divalent isocyanate.

The one-component moisture-curable urethane resin is a composition containing a prepolymer having an isocyanate group at a molecular terminal as an essential component. The prepolymer is usually a polyisocyanate prepolymer having one or more isocyanate groups at both molecular terminals, and is a solid thermoplastic resin at normal temperature. Isocyanate groups react with each other due to moisture in the air to cause a chain extension reaction, and as a result, a reactant having a urea bond in a molecular chain is generated,
The urea bond further reacts with the isocyanate group at the molecular terminal, causing a biuret bond and branching to cause a crosslinking reaction. Although the skeleton structure of the molecular chain of the prepolymer having an isocyanate group at the molecular terminal is arbitrary, specific examples include a polyurethane skeleton having a urethane bond, a polyester skeleton having an ester bond, and a polybutazine skeleton.
One or more of these skeletal structures are appropriately employed. When a urethane bond is present in the molecular chain, the terminal isocyanate group is also opposite to the urethane bond, so that an allophanate bond is generated, and a cross-linking reaction is also caused by the allophanate bond.

[Decoration Layer] The decoration layer is formed of printing ink or paint. Alternatively, a metal thin film or the like can be used as the decoration layer. When a surface layer or the like is formed by laminating a surface covering sheet, the decorative layer may be formed on the base sheet serving as the surface layer. When using a printing ink or paint, the coloring agent used for the decorative layer may be a known one, for example, titanium white,
Inorganic pigments such as carbon black, red iron oxide, graphite and cobalt blue; organic pigments such as aniline black, phthalocyanine blue, isoindolinone, and quinacridone; metal pigments such as aluminum foil powder; pearlescent (pearl) pigments; Is used. Chlorinated polyolefins such as chlorinated polyethylene and chlorinated polypropylene, polyester resins, urethane resins, acrylic resins, vinyl acetate resins, vinyl chloride-vinyl acetate copolymers, and cellulose resins are used as binders for printing inks (or paints). Used.
Above all, acrylic resin is preferable in terms of adhesion when the surface layer is formed of acrylic resin. The pattern of the decorative layer is a wood grain pattern, a stone grain pattern, a cloth grain pattern, a leather pattern, a geometric figure, a character, a symbol, or a solid image on the entire surface.

[Surface-Coated Sheet] As a surface-coated sheet to be laminated at the same time as molding, the molded article M illustrated in FIG. 1 is composed of only the surface layer 3 and the chlorinated polyolefin resin layer 2 as the back layer. What is necessary is just to use the surface coating sheet of a two-layer structure. The thermoplastic resin layer of the surface layer 3 becomes a base sheet. Then, the surface covering sheet may be laminated on the molded resin substrate in such a direction that the chlorinated polyolefin resin layer 2 side as the back layer contacts the molded resin substrate 1.
Further, for the molded article M illustrated in FIG. 2, a surface coating sheet having a three-layer structure in which the surface layer 3 is used as a base sheet and a urethane resin layer 4 and a chlorinated polyolefin resin layer 2 are sequentially laminated thereon. Should be used. Then, for the molded article M illustrated in FIG. 3, the surface layer 3 is used as a base sheet,
A three-layer surface covering sheet in which a decorative layer 5, a urethane resin layer 4, and a chlorinated polyolefin resin layer 2 are sequentially laminated thereon may be used. Each layer on the base sheet is
When a pattern is formed with a decorative layer, it may be formed by a known printing method such as gravure printing, gravure offset printing, or the like. In the case where the decorative layer does not form a pattern but is a solid layer, the chlorinated polyolefin resin layer and the urethane resin layer may be formed by a printing method or a known coating method such as gravure coating.

It is to be noted that the surface layer may contain the coloring agent described in the decorative layer so as to be colored transparent or colored opaque (when there is no decorative layer). Therefore, the surface covering sheet can be said to be a decorative sheet in such a case or when there is a decorative layer. For example, in the case of the molded article M illustrated in FIG. 2, there is no decorative layer 5 but the surface layer 3 is decorated by coloring. Of course, in the molded article of FIG. 2, the surface layer may be a layer which is not colored and is not only for the purpose of decoration but only for the purpose of surface modification such as improvement of scratch resistance.

Next, a method for producing a molded article of the present invention by the injection molding simultaneous lamination method will be described with reference to FIG. The method exemplified here is a mode in which the surface-coated sheet is heated and softened between the molds before the mold clamping, preliminarily molded with an injection molding mold, and then molded and the resin is injected.

First, as shown in FIG. 4A, as an injection mold, a mold A having a runner (runner) and a gate (gate) communicating with the injection nozzle, and a sheet having a suction hole 11 on the mold surface are provided. Using a pair of molding dies of the mold B also serving as the preliminary molding dies, the surface coating sheet S is fixed to the mold B by pressing it with a frame-shaped clamp (not shown) in the mold opened state. Next, as shown in FIG. 4B, the surface-coated sheet is heated and softened by the heater 12 (here, an example of non-contact radiation heating, but contact heating may be used). Then, as shown in FIG. 4 (C), suction molding is performed through suction holes and vacuum forming is performed, and the surface coating sheet is preformed along the cavity surface of the mold B. In addition, vacuum forming may be vacuum press forming using both pressure and air, and this is also included.
Then, both molds are clamped as shown in FIG.
The cavity formed by both molds is filled with a liquid resin in a molten state by heating. Then, after the resin is solidified, the mold is opened, the molded product is taken out, and if there is an unnecessary portion of the surface covering sheet, trimming is appropriately performed. As a result, the surface covering sheet S is laminated on the molded resin substrate 1 as shown in FIG. In this manner, the molded article M of the present invention is obtained.

If the drawing of the sheet is shallow, depending on the uneven shape of the surface on which the surface-coated sheet is to be laminated, the sheet is formed by the resin pressure of the liquid resin to be filled into the mold simultaneously with the resin injection without preforming. There are things. In addition, if the surface to be laminated is a flat surface or a quadric surface, lamination may be performed without sheet molding. In this case, after fixing the surface covering sheet to the portion of the cavity surface to be laminated by static electricity or the like, the mold clamping resin may be injected. In addition, the term “injection molding” as used in the present invention refers to not only injection of “thermoplastic thermoplastic resin” used in general injection molding, but also “injection of thermosetting or two-component reaction-curing resin in a molten state at room temperature. Injecting a “cured product” is also included.

When the surface covering sheet is laminated at the same time as the molding, if a concave / convex pattern such as a grain or a conduit is provided on the cavity surface, a molded article having a concave / convex pattern on the surface layer can be obtained.

[0029]

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

[Examples] For each layer such as a surface layer on a molded resin substrate, a molded article as shown in FIG. 3 was produced by a method of laminating a surface coating sheet. The laminate was described in FIG.
This was performed by an injection molding simultaneous lamination method in which the molding resin substrate was laminated simultaneously with the injection molding.

(Surface Coated Sheet) Transparent 125 μm methyl methacrylate-butyl methacrylate copolymer
On one surface of the thick acrylic resin film, a decorative layer, a urethane resin layer, and a chlorinated polyolefin resin layer were formed in this order by gravure printing in the following order to prepare a surface-coated sheet (decorative sheet). The decorative layer was formed by combining a three-color woodgrain pattern with an ink obtained by adding a coloring pigment such as a red handle to an acrylic resin binder. The urethane resin layer was formed of a thermoplastic urethane resin to a thickness of 1 μm, and the chlorinated polyolefin resin layer was formed to a thickness of 2 μm.

(Molded Article) An injection mold for a console panel used in the interior of an automobile was prepared for molding a molded article. As shown in FIG. 4A, this mold has a suction hole for preforming the sheet on the female mold side. As the molding resin, a resin obtained by mixing 10 parts by weight of ethylene propylene rubber (EPR) with respect to 100 parts by weight of the polypropylene resin was used.

(Molding) First, in the mold open state,
The surface-coated sheet was fixed on a parting surface of a female mold having a suction hole on the mold surface, also serving as a vacuum forming mold in the mold. The sheet was fixed by pressing against the parting surface with a sheet clamp, which is a frame-shaped frame, at the outer peripheral portion of the female mold cavity. Thereafter, the ceramic panel heater having a surface temperature of 330 ° C. is advanced between the male and female molds from the retreat position outside the mold, and the surface coating sheet is heated and softened by non-contact radiant heating. Molding was carried out so that the surface-coated sheet was along the cavity surface of the female mold, and the preforming of the sheet was completed. Thereafter, the heater is retracted to the outside of the mold, both molds are clamped, and the injection resin heated and melted is injected into a cavity formed by both molds. After the resin is cooled and solidified, the mold is opened. The molded product on which the surface covering sheet was laminated was taken out as the molded product of the present invention. The layer structure of the molded product is shown by a molded product M in FIG.

[Comparative Example] A molded product was obtained in the same manner as in the example except that the injection resin used in the example was replaced by a polypropylene resin to which EPR was not added.

[Comparison of Performance] The molded articles obtained in Examples and Comparative Examples were evaluated for adhesion of the laminated surface-coated sheets and compared. Adhesion was measured by applying a cellophane adhesive tape (Nichiban Co., Ltd., “Cellotape” (registered trademark) 24 mm width, industrial use) to the surface of the molded product at 25 ° C. The evaluation was made based on whether the surface-coated sheet was peeled off together with the tape. As a result, the surface-coated sheet was peeled off in the comparative example, but was not peeled off in the example, and the adhesion was good. The molded product was decorated with a wood grain pattern, and the surface was made of an acrylic resin, so that the surface had a coating feeling with good transparency, and the scratch resistance was improved and the surface modification effect was sufficiently obtained.

[0036]

According to the molded article of the present invention, even if the molding resin is a polyolefin resin, the surface is modified with a surface layer having good adhesion, such as abrasion resistance, and decorated with patterns and characters. You can do things. In particular, using acrylic resin for the surface layer,
If the chlorinated polyolefin resin layer and the urethane resin layer are laminated on the molding resin substrate in this order, the surface layer of the acrylic resin with good adhesion will form the surface with excellent scratch resistance, transparency, weather resistance, etc. Goods. Further, the above surface layer, chlorinated polyolefin resin layer,
If a surface-coated sheet having a urethane resin layer, etc. is formed into a molded product by laminating the molded resin substrate simultaneously with the molding of the molded resin substrate, the surface layer has good adhesion, is easy to manufacture, and can be manufactured at low cost. It can be made as a molded product.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a molded article of the present invention.

FIG. 2 is a sectional view showing another embodiment of the molded article of the present invention.

FIG. 3 is a sectional view showing another embodiment of the molded article of the present invention.

FIG. 4 is a conceptual diagram outlining a method for laminating a surface-coated sheet to a molded resin substrate by an injection molding simultaneous lamination method as an example of a method for obtaining a molded article of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molding resin base material 2 Chlorinated polyolefin resin layer 3 Surface layer 4 Urethane resin layer 5 Decorative layer 11 Suction hole 12 Heater A Injection mold (male type) B Injection mold type (female type) M Molded article S Surface coating sheet

Claims (4)

[Claims] 1. A chlorinated polyolefin resin layer in contact with a molded resin substrate is laminated on a molded resin substrate made of a molded product of a resin containing two components of a polyolefin resin and ethylene propylene rubber. A molded article in which a surface layer made of a thermoplastic resin layer is laminated as the outermost layer directly or via another layer. 2. The molded article according to claim 1, wherein the surface layer comprising a thermoplastic resin layer contains an acrylic resin, and the chlorinated polyolefin resin is provided between the surface layer and the chlorinated polyolefin resin layer. A molded article having a urethane resin layer in contact with the layer. 3. The molded article according to claim 1, wherein the surface-coated sheet comprising at least two layers, a surface layer made of a thermoplastic resin layer and a chlorinated polyolefin resin layer as a back layer, is formed of a molding resin. A molded article formed by laminating the molded resin substrate simultaneously with the molding of the substrate. 4. The molded article according to claim 3, wherein the surface layer composed of the thermoplastic resin layer contains an acrylic resin, and is provided between the surface layer and the chlorinated polyolefin resin layer which is the rear surface layer. A molded article in which a surface covering sheet having a urethane resin layer in contact with a chlorinated polyolefin resin layer is laminated on the molded resin substrate at the same time as the molding resin substrate is molded.