JP6969353B2 - Decorative molded body and its manufacturing method - Google Patents

Description

The present invention relates to a decorative molded product and a method for producing the same. Specifically, a decorative molded body having an excellent surface shape obtained by attaching a polypropylene-based decorative film to the surface of a resin molded body made of a fiber-reinforced polypropylene-based resin composition by thermoforming, and a decorative molded body thereof. Regarding the manufacturing method.

Polypropylene is widely used as a living material and an industrial member because it has excellent physical properties, moldability, recyclability, and economic efficiency. In particular, there are strong demands for weight reduction and design improvement in automobile parts, electric equipment parts such as televisions and vacuum cleaners, and polypropylene is often used to meet these demands.
Polypropylene used as a material for the above parts is required to have characteristics such as rigidity, impact resistance, and dimensional stability in a highly balanced manner, and has traditionally been used as an inorganic filler such as talc, mica, and calcium carbonate. Has been devised such as blending.

However, in the automobile field in recent years, there is an increasing demand for low fuel consumption and low emission vehicles such as hybrid vehicles and electric vehicles, and further weight reduction of the automobile body is required, and higher rigidity such as fenders and back doors is required. Although the demand for resinification is increasing for vehicle body members that require the above, the polypropylene-based materials using conventional inorganic fillers have insufficient characteristics such as high rigidity and dimensional stability.

To solve such a problem, a polypropylene-based resin composition having excellent dimensional stability, rigidity, impact resistance, and light weight, in which carbon fiber is blended with polypropylene resin, has been proposed (see Patent Documents 1 and 2). .. The molded body made of the disclosed polypropylene-based resin composition is excellent in the above-mentioned properties, but since the carbon fiber has a poor affinity with polypropylene, a large groove is formed at the interface between the carbon fiber and polypropylene on the surface of the molded body. In addition, when polypropylene crystallizes, the size of the molded body shrinks and the fiber shape of the carbon fiber emerges, so there is a problem that the surface appearance and feel of the molded body such as surface gloss and surface smoothness are significantly inferior.

As a method for improving the appearance and texture, for example, Patent Document 3 discloses a method of polishing the surface of a molded product made of a fiber-reinforced plastic containing carbon fibers in a thermoplastic resin with a wet automatic belt polishing machine. There is a problem that it is difficult to use it for a molded body having a complicated shape such as an automobile part.
Further, according to Patent Document 4, a decorative molded product comprising a combination of a fiber-containing resin, a fiber-free resin, and a decorative film is proposed. According to the disclosed technology, a decorative film is first set in an insert molding machine, a fiber-free resin is injection-molded, and a fiber-containing resin is placed inside the fiber-free resin before the fiber-free resin solidifies. By injection molding, the fiber-containing resin does not come into contact with the film surface, and a decorative molded product having an excellent appearance can be obtained. However, in this method, since different resins are injected a plurality of times, not only the process time becomes long, but also there is a problem that the physical properties of the molded product deteriorate due to the presence of the fiber-free resin.

Japanese Unexamined Patent Publication No. 2005-232413 Japanese Unexamined Patent Publication No. 2005-125581 Japanese Unexamined Patent Publication No. 2002-067070 Japanese Unexamined Patent Publication No. 2000-158841

An object of the present invention is to provide a molded product having dimensional stability, rigidity, and light weight, and having excellent surface appearance and feel such as surface gloss and surface smoothness in view of the above-mentioned prior art. be.

As a result of diligent research, the present inventors have found that a polypropylene-based decorative film composed of a specific layer made of a polypropylene-based resin satisfying a specific requirement is formed on a resin molded product made of a polypropylene-based resin composition containing a specific fiber. Since they are bonded together, it is possible to provide a decorative molded product that has excellent dimensional stability, rigidity, and lightness, as well as the surface appearance and texture of the molded product such as surface gloss and surface smoothness. bottom.

The present invention has the following configuration. That is, the present invention is a decorative molded body in which a polypropylene-based decorative film is attached onto a resin molded body by thermal molding, and the polypropylene-based decorative film is a seal layer made of a polypropylene-based resin (A). The layer (II) composed of (I) and the polypropylene-based resin (B) is included, the polypropylene-based resin (A) satisfies the following requirements (a1) to (a4), and the polypropylene-based resin (B) is described below. It is a decorative film satisfying the requirements (b1) to (b2), and the resin molded body is a polypropylene-based resin (a) 40% by weight to 99% by weight satisfying the following requirements (a-i) to (a-ii). A fiber-reinforced polypropylene-based material containing 1% by weight to 60% by weight of a fiber (a) satisfying the following requirements (i-i) (however, the total amount of (a) and (b) is 100% by weight). It is a decorative molded body made of the resin composition (c), wherein the polypropylene-based decorative film and the resin molded body are molded bodies bonded via a seal layer (I).

Polypropylene resin (A)
(A1) The metallocene-catalyzed propylene-based polymer (a2) melt flow rate (230 ° C., 2.16 kg load) (MFR (A)) exceeds 0.5 g / 10 minutes (a3) melting peak temperature (a3). Tm (A)) is less than 150 ° C. (a4) Polypropylene resin (B) having a molecular weight distribution (Mw / Mn (A)) obtained by GPC measurement is 1.5 to 3.5.
(B1) Melt flow rate (230 ° C., 2.16 kg load) (MFR (B)) and MFR (A) satisfy the relational expression (b-1) MFR (B) <MFR (A) ... Equation (b-1),
(B2) The melting peak temperature (Tm (B)) and Tm (A) satisfy the relational expression (b-2). Tm (B)> Tm (A) ... Equation (b-2)
Polypropylene resin (a)
(A-i): The melting peak temperature Tm (a) is 110 ° C. or higher.
(A-ii): MFR (a) (230 ° C., 2.16 kg load) is 0.5 g / 10 minutes or more and 200 g / 10 minutes or less.
Fiber (a)
(I): The fiber (a) is at least one selected from the group consisting of glass fiber and carbon fiber.

The polypropylene-based resin (A) is the decorative molded product characterized by being a propylene / α-olefin copolymer.
Further, the present invention is the above-mentioned decorative molded product, wherein Tm (A) is 140 ° C. or lower.

Further, the present invention is characterized in that the polypropylene-based decorative film has a surface decorative layer (III) made of a surface decorative layer resin on a surface opposite to the surface to which the resin molded body is attached. It is the above-mentioned decorative molded body.
Further, in the present invention, the surface decorative layer resin is made of a polypropylene-based resin (D), and the MFR (230 ° C., 2.16 kg load) of the polypropylene-based resin (D) exceeds 2 g / 10 minutes. It is the above-mentioned decorative molded body which is characteristic.

Further, the present invention is characterized in that the arithmetic average roughness Ra measured according to ISO4287 / 1997 on the surface side of the polypropylene-based decorative film attached to the decorative molded product is 2 μm or less. It is the above-mentioned decorative molded body.

Further, the present invention is a method for manufacturing the decorative molded product, wherein the polypropylene-based decorative film is prepared, the resin molded product is prepared, and the resin molded product and the resin molded product are placed in a decompressable chamber box. The step of setting the decorative film, the step of depressurizing the inside of the chamber, the step of heating and softening the decorative film, the step of pressing the decorative film against the resin molded body, and the step of returning or pressurizing the inside of the chamber to atmospheric pressure. It is a method for manufacturing a decorative molded product, which comprises steps.

According to the decorative molded article of the present invention, a polypropylene-based decorative film composed of a specific layer of a polypropylene-based resin satisfying a specific requirement on a resin molded article composed of a polypropylene-based resin composition containing a specific fiber. It is possible to provide a decorative molded product that has excellent surface appearance and feel, such as surface gloss and surface smoothness, while having dimensional stability, rigidity, and light weight. And said.
Further, according to the method for manufacturing a decorative molded product of the present invention, there are no holes or wrinkles on the surface thereof, air is not caught between the decorative film and the resin molded product, and scratches are not noticeable. You can get a body. In addition, the decorative film can be neatly attached to a resin molded body having a complicated shape, which has been difficult to bond in the past. Further, since the decorative molded product thus obtained does not contain a thermosetting resin layer, the appearance and performance are less deteriorated at the time of recycling, and the recycling suitability is high.

It is a figure which shows the example of the layer structure of the decorative molded article of this invention. It is a schematic sectional drawing explaining the outline of the apparatus used in the manufacturing method of the decorative molded article of this invention. It is a schematic cross-sectional view explaining the appearance that the resin molded body and the decorative film are set in the apparatus of FIG. It is a schematic cross-sectional view explaining the state of heating and depressurizing the inside of the apparatus of FIG. FIG. 3 is a schematic cross-sectional view illustrating a state in which a decorative film is pressed against a resin molded body in the apparatus of FIG. 2. It is a schematic cross-sectional view explaining how the inside of the apparatus of FIG. 2 returns to atmospheric pressure or pressurizes. It is a schematic cross-sectional view explaining how the edge of an unnecessary decorative film was trimmed in the obtained decorative molded body.

In the present specification, the decorative film means a film for decorating a molded product. Decorative molding refers to molding in which a decorative film and a molded body are attached to each other. The three-dimensional decorative thermoforming is a molding in which a decorative film and a molded body are bonded, and has a step of thermoforming the decorative film along the bonding surface of the molded body and simultaneously bonding the decorative film. In this step, in order to prevent air from being entrained between the decorative film and the molded body, thermoforming is performed under reduced pressure (vacuum), the heated decorative film is attached to the molded body, and pressure is applied. It refers to molding, which is the process of bringing the product into close contact by releasing (pressurizing) it. Hereinafter, embodiments for carrying out the present invention will be described in detail.

The decorative molded body of the present invention is a decorative molded body in which a polypropylene-based decorative film is attached onto a resin molded body by thermal molding, and the polypropylene-based decorative film is made of a polypropylene-based resin (A). The polypropylene-based resin (A) satisfies the following requirements (a1) to (a4), and the polypropylene-based resin (B) includes a layer (II) composed of a seal layer (I) and a polypropylene-based resin (B). Is a decorative film satisfying the following requirements (b1) to (b2), and the resin molded body is a polypropylene-based resin (a) 40% by weight or more satisfying the following requirements (a-i) to (a-ii). A fiber containing 99% by weight and a fiber (a) 1% by weight to 60% by weight (provided that the total amount of (a) and (b) is 100% by weight) that satisfies the following requirements (i). A decorative molded body made of a reinforced polypropylene-based resin composition (c), wherein the polypropylene-based decorative film and the resin molded body are molded bodies bonded via a seal layer (I). Is.

Polypropylene resin (A)
(A1) The metallocene-catalyzed propylene-based polymer (a2) melt flow rate (230 ° C., 2.16 kg load) (MFR (A)) exceeds 0.5 g / 10 minutes (a3) melting peak temperature (a3). Tm (A)) is less than 150 ° C. (a4) Polypropylene resin (B) having a molecular weight distribution (Mw / Mn (A)) obtained by GPC measurement is 1.5 to 3.5.
(B1) Melt flow rate (230 ° C., 2.16 kg load) (MFR (B)) and MFR (A) satisfy the relational expression (b-1) MFR (B) <MFR (A) ... Equation (b-1),
(B2) The melting peak temperature (Tm (B)) and Tm (A) satisfy the relational expression (b-2). Tm (B)> Tm (A) ... Equation (b-2)
Polypropylene resin (a)
(A-i): The melting peak temperature Tm (a) is 110 ° C. or higher.
(A-ii): MFR (a) (230 ° C., 2.16 kg load) is 0.5 g / 10 minutes or more and 200 g / 10 minutes or less.
Fiber (a)
(I): The fiber (a) is at least one selected from the group consisting of glass fiber and carbon fiber.

Polypropylene resin (A)
The decorative film of the present invention contains a seal layer (I) made of a polypropylene-based resin (A). The seal layer (I) is a layer that comes into contact with the resin molded body (base) during three-dimensional decorative thermoforming. The polypropylene-based resin (A) is preferably a resin that is easily melted and relaxed. By providing the seal layer (I), the generation of holes, wrinkles, air entrainment, etc. on the surface of the decorative molded product can be suppressed, and scratches on the surface of the substrate can be made inconspicuous.

The melt flow rate (230 ° C., 2.16 kg load) MFR (A) of the polypropylene resin (A) needs to exceed 0.5 g / 10 minutes, preferably 1 g / 10 minutes or more, more preferably. 2g / 10 minutes or more. Within the above range, relaxation during three-dimensional decorative thermoforming sufficiently progresses, and sufficient adhesive strength can be exhibited. The upper limit of MFR (A) is not limited, but is preferably 100 g / 10 minutes or less. Within the above range, the adhesive strength does not deteriorate due to the deterioration of physical properties.

In the present specification, the MFR of the polypropylene-based resin and the polypropylene-based resin composition described later was measured in accordance with ISO 1133: 1997 Connections M under the conditions of 230 ° C. and a 2.16 kg load. The unit is g / 10 minutes.

The Mw / Mn of the polypropylene-based resin (A) is 1.5 to 3.5, preferably 2 to 3. Within the above range, there are few components having a relatively long relaxation time, and it is easy to sufficiently relax, which is preferable.
Mn and Mw are described in "Basics of Polymer Chemistry" (edited by the Society of Polymer Chemistry, Tokyo Kagaku Dojin, 1978) and are values calculated from the molecular weight distribution curve by GPC.

The melting point (DSC melting peak temperature) of the polypropylene-based resin (A) is less than 150 ° C., preferably 145 ° C. or lower, more preferably 140 ° C. or lower, still more preferably 130 ° C. or lower. Within the above range, sufficient adhesive strength can be exhibited. If the Tm (A) is too low, the heat resistance may be lowered and problems may occur in the use of the molded product. Therefore, the temperature is preferably 100 ° C. or higher, more preferably 110 ° C. or higher.

The polypropylene-based resin (A) of the present invention is a so-called metallocene-catalyzed propylene-based polymer polymerized by a metallocene catalyst. Since the metallocene catalyst has a single active point, the propylene-based polymer polymerized by the metallocene catalyst has a narrow molecular weight distribution and crystallinity distribution, and is easy to melt and relax. Can be fused with.

The polypropylene-based resin (A) in the present invention is a propylene-based resin of various types such as a propylene homopolymer (homopolypropylene), a propylene-α-olefin copolymer (random polypropylene), and a propylene block copolymer (blockpolypropylene). Polymers or combinations thereof can be selected. The propylene-based polymer preferably contains 50 mol% or more of the propylene monomer. The propylene-based polymer preferably does not contain a polar group-containing monomer unit.

The polypropylene-based resin (A) is preferably a propylene-α-olefin copolymer from the viewpoint of sealing property, and the propylene-α-olefin copolymer usually has a lower melting point than the propylene homopolymer. Since the crystallization temperature is also lowered, it is more easily deformed during thermal molding and has a high effect of making scratches inconspicuous.
As the α-olefin, one or a combination of two or more selected from ethylene and an α-olefin having 3 to 8 carbon atoms can be used.

Further, the polypropylene-based resin (A) may contain additives, fillers, other resin components and the like. That is, it may be a resin composition (polypropylene resin composition) of a propylene-based polymer and an additive, a filler, other resin components, and the like. The total amount of additives, fillers, other resin components and the like is preferably 95% by weight or less with respect to the polypropylene-based resin composition.

When the polypropylene-based resin (A) is a polypropylene-based resin composition, it is preferable that the polypropylene-based resin composition has the characteristics of the polypropylene-based resin (A).

As the additive, it can be used for polypropylene-based resins such as antioxidants, neutralizers, light stabilizers, ultraviolet absorbers, crystal nucleating agents, blocking inhibitors, lubricants, antistatic agents, and metal deactivators. Various known additives can be blended.

Examples of the antioxidant include a phenol-based antioxidant, a phosphite-based antioxidant, and a thio-based antioxidant. Examples of the neutralizing agent include higher fatty acid salts such as calcium stearate and zinc stearate. Examples of the light stabilizer and the ultraviolet absorber include hindered amines, benzotriazoles, benzophenones and the like.

Examples of the crystal nucleating agent include amide-based nucleating agents such as aromatic carboxylic acid metal salts, aromatic phosphoric acid metal salts, sorbitol-based derivatives, and rosin metal salts. Among these crystal nucleating agents are aluminum pt-butyl benzoate, 2,2'-methylenebis phosphate (4,6-di-t-butylphenyl) sodium, and 2,2'-methylenebis phosphate (4). , 6-di-t-butylphenyl) aluminum, bis (2,4,8,10-tetra-tert-butyl-6-hydroxy-12H-dibenzo [d, g] [1,2,3] dioxaphospho Syn-6-oxide) Complex of aluminum hydroxide salt and organic compound, p-methyl-benzylene sorbitol, p-ethyl-benzylidene sorbitol, 1,2,3-trideoxy-4,6: 5,7-bis- [ (4-propylphenyl) Methylene] -Nonitol, sodium salt of rosin and the like can be exemplified.

Examples of the lubricant include higher fatty acid amides such as stearic acid amide. Examples of the antistatic agent include fatty acid partial esters such as glycerin fatty acid monoester. Examples of the metal deactivator include triazines, phosphons, epoxies, triazoles, hydrazides, oxamides and the like.

As the filler, various known fillers that can be used for polypropylene-based resins, such as inorganic fillers and organic fillers, can be blended. Examples of the inorganic filler include calcium carbonate, silica, hydrotalcite, zeolite, aluminum silicate, magnesium silicate, glass fiber and carbon fiber. Examples of the organic filler include crosslinked rubber fine particles, thermosetting resin fine particles, and thermosetting resin hollow fine particles.

Other resin components include ethylene-α-olefin random copolymers, thermoplastic elastomers mainly composed of propylene and / or butene, styrene-based elastomers, aromatic hydrocarbon resins, and polar functional groups having heteroatoms. Examples thereof include a polyolefin resin having the same.

The ethylene-α-olefin random copolymer is preferably a copolymer of ethylene and an α-olefin having 3 to 20 carbon atoms. Specific examples of the α-olefin having 3 to 20 carbon atoms include propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-heptene, 1-octene, and 1-. Examples thereof include decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-eikosen and the like. Among these, propylene, 1-butene, 1-hexene and 1-octene are particularly preferably used.
Commercially available products of such ethylene-α-olefin random copolymers include the kernel series manufactured by Japan Polyethylene Corporation, the Toughmer P series manufactured by Mitsui Chemicals Co., Ltd., the Tuffmer A series, and the Engage EG series manufactured by DuPontau. And so on.

Examples of the thermoplastic elastomer containing propylene and / or butene as a main component include a thermoplastic elastomer containing propylene as a main component, a thermoplastic elastomer containing butene as a main component, and a thermoplastic having a total component of propylene and butene as a main component. Elastomers are included. Such thermoplastic elastomers are preferably copolymers of propylene and / or butene with α-olefins other than propylene and butene. Specific examples of the α-olefin include ethylene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-heptene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene and 1-. Hexadecene, 1-eikosen and the like can be mentioned. These α-olefins can be used alone or in combination.
Examples of such thermoplastic elastomers include Toughmer XM series, Toughmer BL series, and Toughmer PN series manufactured by Mitsui Chemicals, Inc., and VISTAMAXX series manufactured by ExxonMobil Chemicals.

Examples of the styrene-based elastomer include styrene / butadiene / styrene triblock copolymer elastomer (SBS), styrene / isoprene / styrene triblock copolymer elastomer (SIS), styrene-ethylene / butylene copolymer elastomer (SEB), and styrene. -Ethethylene / propylene copolymer elastomer (SEP), styrene-ethylene / butylene-styrene copolymer elastomer (SEBS), styrene-ethylene / butylene-ethylene copolymer elastomer (SEBC), hydrogenated styrene / butadiene elastomer (HSBR) ), Styrene-ethylene / propylene-styrene copolymer elastomer (SEPS), styrene-ethylene / ethylene / propylene-styrene copolymer elastomer (SEEPS), styrene-butadiene / butylene-styrene copolymer elastomer (SBBS), etc. It can be exemplified, and those hydrolyzed can be particularly preferably used.
Examples of commercially available products include Dynalon series manufactured by JSR Corporation, Kraton G series manufactured by Kraton Polymer Japan Co., Ltd., and Tough Tech series manufactured by Asahi Kasei Corporation.

As the aromatic hydrocarbon resin, a hydrocarbon resin obtained by polymerizing one or a mixture of two or more dicyclopentadiene derivatives such as dicyclopentadiene, methyldicyclopentadiene, and dimethyldicyclopentadiene as a main raw material. Hydrocarboned Kumaron-Inden resin, Hydrocarbonized C9 petroleum resin, Hydrocarbonized C5 petroleum resin, C5 / C9 copolymerized petroleum resin, Hydrocarbonated terpene resin, Hydrocarbonized rosin resin, etc. It can be used, specifically, the Archon series manufactured by Arakawa Chemical Co., Ltd., the T-REZ series manufactured by Tonen Chemical Co., Ltd., the Quintone series manufactured by Nippon Zeon Co., Ltd., and the Quintone series manufactured by Idemitsu Kosan Co., Ltd. The Imarve series can be mentioned.

Examples of the polar functional group having a hetero atom include an epoxy group, a carbonyl group, an ester group, an ether group, a hydroxy group, a carboxy group or a metal salt thereof, an alkoxy group, an aryloxy group, an acyl group, an acyloxy group, and an acid anhydride group. Examples thereof include an amino group, an imide group, an amide group, a nitrile group, a thiol group, a sulfo group, an isocyanate group and a halogen group. Specific examples of polyolefins having such polar functional groups include acid-modified polypropylenes such as maleic anhydride-modified polypropylene, maleic acid-modified polypropylene, and acrylic acid-modified polypropylene; ethylene / vinyl chloride copolymer and ethylene / vinylidene chloride copolymer. Combined, ethylene / acrylonitrile copolymer, ethylene / methacrylonitrile copolymer, ethylene / vinyl acetate copolymer, ethylene / acrylamide copolymer, ethylene / methacrylamide copolymer, ethylene / acrylic acid copolymer, ethylene / Methacrylic acid copolymer, ethylene / maleic acid copolymer, ethylene / methyl acrylate copolymer, ethylene / ethyl acrylate copolymer, ethylene / isopropyl acrylate copolymer, ethylene / butyl acrylate copolymer , Ethylene / isobutyl acrylate copolymer, ethylene / 2-ethylhexyl acrylate copolymer, ethylene / methyl methacrylate copolymer, ethylene / ethyl methacrylate copolymer, ethylene / isopropyl methacrylate copolymer, ethylene / Butyl methacrylate copolymer, ethylene / isobutyl methacrylate copolymer, ethylene / 2-ethylhexyl methacrylate copolymer, ethylene / maleic anhydride copolymer, ethylene / ethyl acrylate / maleic anhydride copolymer, ethylene / Acrylic acid metal salt copolymer, ethylene / methacrylate metal salt copolymer, ethylene / vinyl acetate copolymer or its sacrifice, ethylene / vinyl propionate copolymer, ethylene / glycidyl methacrylate copolymer, Ethylene or α-olefin / vinyl monomer copolymers such as ethylene / ethyl acrylate / glycidyl methacrylate copolymer, ethylene / vinyl acetate / glycidyl methacrylate copolymer; chlorinated polypropylene, chlorinated polyethylene, etc. Examples include copolymers. Examples of commercially available products include the product name "Admer" manufactured by Mitsui Chemicals, the product name "Modic" manufactured by Mitsubishi Chemical Corporation, and "Youmex" manufactured by Sanyo Chemicals.

It is also possible to color the product in order to impart designability, and various colorants such as inorganic pigments, organic pigments and dyes can be used for coloring. Further, a bright material such as aluminum flakes, titanium oxide flakes, and (synthetic) mica can also be used.

The polypropylene-based resin composition is prepared by melt-kneading a propylene-based polymer with an additive, a filler, and other resin components, and by melt-kneading a propylene-based polymer with an additive, a filler, and the like, and drying the other resin components. It can be produced by a method of blending, a method of dry blending a masterbatch in which an additive, a filler and the like are dispersed in a carrier resin in addition to a propylene polymer and other resin components at a high concentration.

Polypropylene resin (B)
The decorative film of the present invention contains a layer (II) made of a polypropylene-based resin (B). The polypropylene-based resin (B) is preferably a resin that is harder to melt and relax than the polypropylene-based resin (A). By providing the layer (II), it is possible to suppress the occurrence of poor appearance due to the film breaking or violent during thermoforming. As a result, the decorative film does not need to contain a thermosetting resin layer having excellent thermoformability in order to improve thermoformability.

The melt flow rate (230 ° C., 2.16 kg load) (MFR (B)) of the polypropylene-based resin (B) needs to be lower than that of MFR (A), that is, MFR (B) <MFR ( The relationship of A) is satisfied, preferably the relationship of MFR (B) ≦ 0.5 × MFR (A), and more preferably the relationship of MFR (B) ≦ 0.25 × MFR (A). Within the above range, the thermoformability becomes good. The lower limit of MFR (B) is not limited regardless of the value of MFR (A), but is preferably MFR (B) ≧ 0.01 × MFR (A).

The MFR (B) is not particularly limited as long as it is in the above range, but is preferably 0.1 g / 10 minutes or more, and more preferably 0.2 g / 10 minutes or more. Within the above range, the ductility of the decorative film is good during thermoforming. The MFR (B) is preferably 20 g / 10 minutes or less, more preferably 15 g / 10 minutes or less.

The melting peak temperature (Tm (B)) in the DSC measurement of the polypropylene-based resin needs to be higher than Tm (A), and Tm (B)> Tm (A). Within the above range, the thermoformability becomes good.
Tm (B) is not particularly limited as long as it is in the above range, but is preferably 150 ° C. or higher, more preferably 155 ° C. or higher. Within the above range, heat resistance, scratch resistance, and solvent resistance are good.

The polypropylene-based resin (B) can be selected from a metallocene-catalyzed propylene-based polymer, a Ziegler-Natta-catalyzed propylene-based polymer, and the like. A Ziegler-Natta catalytic propylene polymer is preferred.

The polypropylene-based resin (B) in the present invention is a propylene-based resin of various types such as a propylene homopolymer (homopolypropylene), a propylene-α-olefin copolymer (random polypropylene), and a propylene block copolymer (blockpolypropylene). Polymers or combinations thereof can be selected. The propylene-based polymer preferably contains 50 mol% or more of polymerization units derived from the propylene monomer.

The polypropylene-based resin (B) may contain additives, fillers, colorants, other resin components, and the like. That is, it may be a resin composition (polypropylene resin composition) containing a propylene-based polymer, additives, fillers, colorants, other resin components, and the like. The total amount of additives, fillers, colorants, other resin components and the like is preferably 50% by weight or less with respect to the polypropylene-based resin composition.

When the polypropylene-based resin (B) is a polypropylene-based resin composition, it is preferable that the polypropylene-based resin composition has the characteristics of the polypropylene-based resin (B).

As the additive, an additive or the like that may be contained in the polypropylene-based resin (A) can be used.

It is also possible to color the product in order to impart designability, and various colorants such as inorganic pigments, organic pigments and dyes can be used for coloring. Further, a bright material such as aluminum flakes, titanium oxide flakes, and (synthetic) mica can also be used.

When the decorative molded product of the present invention is molded as a colored molded product, a colorant needs to be used only for the decorative film, so that an expensive colorant is used as compared with the case where the entire resin molded product is colored. It is possible to suppress. In addition, changes in physical properties associated with the addition of a colorant can be suppressed.

The polypropylene-based resin composition is prepared by melt-kneading a propylene-based polymer with an additive, a filler, and other resin components, and by melt-kneading a propylene-based polymer with an additive, a filler, and the like, and drying the other resin components. It can be produced by a method of blending, a method of dry blending a masterbatch in which an additive, a filler and the like are dispersed in a carrier resin in addition to a propylene polymer and other resin components at a high concentration.

Decorative film The decorative film in the present invention includes a seal layer (I) made of a polypropylene-based resin (A) and a layer (II) made of a polypropylene-based resin (B). The decorative film can have various configurations in addition to the seal layer (I) and the layer (II). That is, the decorative film is a two-layer film composed of the seal layer (I) and the layer (II), but is a multilayer film having three or more layers composed of the seal layer (I) and the layer (II) and another layer. There may be. The seal layer (I) is attached along the resin molded body (base). Further, the surface of the decorative film may be textured, embossed, printed, sandplasted, scratched or the like.

The decorative film has a large degree of freedom in shape, and the end face of the decorative film is caught up to the back side of the object to be decorated, so that no seam is formed, so that the appearance is excellent. You can express various textures with. For example, in the case of imparting a texture such as embossing to a resin molded body, three-dimensional decorative thermoforming may be performed using an embossed decorative film. For this reason, there are problems in molding with a molded die that embosses, that is, a molded die is required for each embossing pattern, and it is very difficult and expensive to apply complicated embossing to a curved die. It is possible to solve the problem of being, and to obtain a decorative molded body easily embossed with various patterns.

The multilayer film can include a surface layer, a surface decoration layer, a printing layer, a light-shielding layer, a coloring layer, a base material layer, a barrier layer, a tie layer layer that can be provided between these layers, and the like. The layer (II) made of the polypropylene-based resin (B) may be any layer other than the seal layer among the layers constituting the multilayer film.

In the multilayer film, the layers other than the seal layer (I) and the layer (II) are preferably a layer made of a thermoplastic resin, and more preferably a layer made of a polypropylene resin. As long as the layers other than the seal layer (I) and the layer (II) can be distinguished from the seal layer (I) and the layer (II), the MFR (230 ° C., 2.16 kg load) of the polypropylene-based resin constituting the seal layer (I) and the layer (II) can be distinguished from each other. There are no particular restrictions. Each layer is preferably a layer that does not contain a thermosetting resin. By using the thermoplastic resin, the recyclability is improved, and by using the polypropylene-based resin, the complexity of the layer structure can be suppressed, and the recyclability is further improved.

When the decorative film is a two-layer film, the layer (II) made of the polypropylene-based resin (B) constitutes a surface layer opposite to the surface to be attached to the resin molded body, and is made of the polypropylene-based resin (A). The sealing layer (I) constitutes a sealing layer on the surface to be attached to the resin molded body.

When the decorative film is a multilayer film having three or more layers, another layer is interposed between the seal layer (I) made of the polypropylene resin (A) and the layer (II) made of the polypropylene resin (B). Then, the effect of suppressing the emergence of scratches on the surface of the substrate may be reduced. Therefore, the multilayer film is a seal layer (I) made of polypropylene-based resin (A) / a layer (II) made of polypropylene-based resin (B) / other layers (plurality of layers) from the sticking surface side of the resin molded body. ) Is preferable.

Another preferred embodiment of the decorative film is a multilayer film containing a surface decorative layer (III) made of a surface decorative layer resin on the outermost surface opposite to the surface to be attached to the resin molded body. The surface decorative layer resin is preferably a thermoplastic resin, more preferably a polypropylene-based resin (D).

Polypropylene resin (D)
The melt flow rate (230 ° C., 2.16 kg load) (MFR (D)) of the polypropylene-based resin (D) in the present invention preferably exceeds 2 g / 10 minutes, and more preferably MFR (D)> MFR. (B) is satisfied. By setting the range of the above values, a more beautiful surface texture can be expressed. By further providing a layer (III) made of a polypropylene-based resin (D) on the surface layer of the decorative film, gloss and grain transferability can be improved without significantly reducing thermoformability. Further, by using the polypropylene-based resin (D), it is possible to suppress the complexity of the layer structure and the deterioration of recyclability. In addition, by using the polypropylene-based resin (D) for the surface decorative layer of the decorative film, it is possible to improve the solvent resistance and the like. Further, by using the polypropylene resin (D) for the surface decorative layer, the transferability of the surface at the time of manufacturing the decorative film and at the time of thermoforming is improved, and if a mirror surface roll is used at the time of thermoforming, it has high gloss. It can be used as a decorative film.

The polypropylene-based resin (D) in the present invention is a propylene-based resin of various types such as a propylene homopolymer (homopolypropylene), a propylene-α-olefin copolymer (random polypropylene), and a propylene block copolymer (blockpolypropylene). Polymers or combinations thereof can be selected. The propylene-based polymer preferably contains 50 mol% or more of the propylene monomer. The propylene-based polymer preferably does not contain a polar group-containing monomer unit. The polypropylene-based resin (D) is preferably homopolypropylene from the viewpoint of oil resistance, solvent resistance, scratch resistance and the like. Further, from the viewpoint of gloss and transparency (color development), a propylene-α-olefin copolymer is preferable.

The polypropylene resin (D) preferably has an MFR (230 ° C., 2.16 kg load) of more than 2 g / 10 minutes, more preferably 5 g / 10 minutes or more, and further preferably 9 g / 10 minutes or more. By setting the MFR of the polypropylene-based resin (D) to the above value range, effects such as improvement of gloss of the decorative film and improvement of grain transferability can be obtained, and the required surface shape of the molded product ( It is possible to obtain a decorative molded product having a good appearance with respect to gloss, non-gloss, grain, etc.).

The upper limit of the MFR of the polypropylene-based resin (D) is not particularly limited, but is preferably 100 g / 10 minutes or less, and more preferably 50 g / 10 minutes or less. By setting the MFR in the above value range, good oil resistance, solvent resistance, scratch resistance and the like can be exhibited.

The polypropylene-based resin (D) may contain additives, fillers, colorants, other resin components, and the like. That is, it may be a resin composition (polypropylene resin composition) of a propylene-based polymer and an additive, a filler, a colorant, other resin components, and the like. The total amount of additives, fillers, colorants, other resin components and the like is preferably 50% by weight or less with respect to the polypropylene-based resin composition.

As the additive, an additive or the like that may be contained in the polypropylene-based resin (A) can be used.

The polypropylene-based resin (D) constituting the surface decorative layer (III) may be the same as or different from the polypropylene-based resin (A) constituting the seal layer (I).

When the polypropylene-based resin (D) constituting the surface decorative layer (III) is a polypropylene-based resin composition, this polypropylene-based resin composition comprises the polypropylene-based resin (A) constituting the seal layer (I). It may be the same as or different from the polypropylene-based resin composition to be used. When both polypropylene-based resin compositions are the same, the seal layer (I) and the surface decoration layer (III) can be formed by using a feed block or the like with one extruder. Has advantages.

The polypropylene-based resin composition is prepared by melt-kneading a propylene-based polymer with an additive, a filler, and other resin components, and by melt-kneading a propylene-based polymer with an additive, a filler, and the like, and drying the other resin components. It can be produced by a method of blending, a method of dry blending a masterbatch in which an additive, a filler and the like are dispersed in a carrier resin in addition to a propylene polymer and other resin components at a high concentration.

The decorative film of the present invention has a thickness of preferably about 20 μm or more, more preferably about 50 μm or more, still more preferably about 80 μm or more. By increasing the thickness of the decorative film to such a value or more, the effect of imparting designability is improved, the stability during molding is also improved, and it is possible to obtain a better decorative molded product. On the other hand, the thickness of the decorative film is preferably about 2 mm or less, more preferably about 1.2 mm or less, still more preferably about 0.8 mm or less. By reducing the thickness of the decorative film to such a value or less, the time required for heating during thermoforming is shortened, productivity is improved, and it becomes easy to trim unnecessary parts.

In the decorative film of the present invention, the ratio of the thickness of the seal layer (I) to the total thickness of the decorative film is preferably 1 to 70%, and the ratio of the thickness of the layer (II) is preferably 30 to. It is 99%. If the ratio of the thickness of the seal layer (I) to the entire decorative film is within the above value range, sufficient adhesive strength can be exhibited and scratches on the resin molded body (base) are exposed on the surface. Can be suppressed. Further, if the ratio of the thickness of the layer (II) to the entire decorative film is within the above value range, it is possible to avoid insufficient thermoformability of the decorative film.

Further, in the multilayer film provided with the surface decorative layer (III) made of polypropylene resin (D) on the outermost surface of the decorative film, the thickness of the entire decorative film having the thickness of the layer (III) in the decorative film. The ratio to the above is preferably 30% or less.

Production of Decorative Film The decorative film of the present invention can be produced by various known molding methods.
For example, a method of coextruding a seal layer (I) made of a polypropylene resin (A) and a layer (II) made of a polypropylene resin (B), a seal layer (I) and a layer (II), and another layer. Co-extrusion molding method, thermal lamination method in which the other layer is bonded by applying heat and pressure on one surface of one layer extruded in advance, dry lamination method in which the other layer is bonded via an adhesive, and Examples include a wet lamination method, an extrusion lamination method in which a polypropylene-based resin is melt-extruded on one surface of one layer extruded in advance, and a sand lamination method. As an apparatus for forming the decorative film, a known coextrusion T-die molding machine or a known laminating molding machine can be used. Among these, a coextrusion T-die molding machine is preferably used from the viewpoint of productivity.

As a method of cooling the molten decorative film extruded from the die, a method of bringing the molten decorative film into contact with one cooling roll via the air discharged from the air knife unit or the air chamber unit, or A method of crimping with a plurality of cooling rolls to cool the film can be mentioned.

In order to impart gloss to the decorative film of the present invention, a method of surface-transferring a mirror-shaped cooling roll to the design surface of the product to perform mirror surface processing is used.

Further, the surface of the decorative film of the present invention may have a textured shape. Such a decorative film is a method in which a molten resin extruded from a die is directly pressure-bonded between a roll having an uneven shape and a smooth roll to transfer the uneven shape to a surface. It can be manufactured by a method of surface transfer by pressure contacting a heated roll and a smooth cooling roll. Examples of the grain shape include satin-like, animal skin-like, hairline-like, and carbon-like.

The decorative film of the present invention may be heat-treated after film formation. Examples of the heat treatment method include a method of heating with a heat roll, a method of heating with a heating furnace or a far-infrared heater, a method of blowing hot air, and the like.

Resin molded body The resin molded body (to be decorated) to be decorated in the present invention is a fiber composed of polypropylene-based resin (a) 40% by weight to 99% by weight and fiber (b) 1% by weight to 60% by weight. It is a molded product obtained by molding a reinforced polypropylene-based resin composition (c).

Polypropylene resin (a)
As the polypropylene-based resin (a) used in the present invention, various known types such as a propylene homopolymer (homopolypropylene), a propylene-α-olefin copolymer, or a propylene block copolymer are selected. It can do and meet the following requirements (a-i) to (a-ii).
(A-i): The melting peak temperature Tm (a) of the polypropylene-based resin (a) is 110 ° C. or higher.
(A-ii): The MFR (a) (230 ° C., 2.16 kg load) of the polypropylene-based resin (a) is 0.5 g / 10 minutes or more and 200 g / 10 minutes or less.

The melting peak temperature Tm (a) of the polypropylene-based resin (a) needs to be 110 ° C. or higher, preferably 125 ° C. or higher, more preferably 125 ° C. or higher, because problems in practical use occur due to a decrease in heat resistance and a decrease in rigidity. It is 130 ° C. or higher. The melting peak temperature Tm (a) can be controlled by adjusting the catalyst used and the content of ethylene copolymerized with propylene.

The MFR (a) (230 ° C., 2.16 kg load) of the polypropylene-based resin (a) is 0.5 to 200 g / 10 minutes, preferably 1 to 150 g / 10 minutes, and more preferably 5 to 100 g / 10. Minutes. Within the above range, deterioration of the molded appearance that occurs during the manufacture of the molded product, such as deterioration of the weld appearance, can be suppressed.

The polypropylene-based resin (a) is of various types using various known propylene monomers such as a propylene homopolymer (homopolypropylene), a propylene-α-olefin copolymer, or a propylene block copolymer as a main raw material. You can choose the one.

Fiber (a)
The fiber (a) used in the present invention satisfies the following property (i-i).
(I): The fiber (a) is at least one selected from the group consisting of glass fiber and carbon fiber.
Since the fiber (a) used in the present invention has a high tensile elastic modulus and tensile strength, it has physical properties such as rigidity and heat resistance of the resin composition and its molded body, dimensional stability (reduction of linear expansion coefficient, etc.), and environment. It has features that contribute to each improvement of adaptability.

Further, it is particularly preferable to use glass fiber from the viewpoint of easiness and economic efficiency of producing the fiber-reinforced composition of the present invention while sufficiently obtaining the effects of the present invention.

Further, the fiber (a) can be used in combination of two or more kinds, and can also be used in the form of a so-called masterbatch in which polypropylene-based resin or the like is previously contained in a relatively high concentration.

Further, various inorganic or organic fillers such as talc, mica, glass beads, glass balloons, whiskers and organic fibers that do not fall under the provisions of (i-i) can be used in combination as long as the effects of the present invention are not significantly impaired. ..

Hereinafter, various fibers specified in (i) of the present invention will be described in detail.

Glass fiber The glass fiber can be used without particular limitation, and examples of the type of glass used for the fiber include E glass, C glass, A glass, S glass, and the like, among which E glass is used. preferable. The method for producing the glass fiber is not particularly limited, and the glass fiber is produced by various known production methods.
In addition, two or more types of glass fibers can be used in combination.

The fiber length of the glass fiber is preferably 2 to 20 mm, more preferably 3 to 10 mm. If the fiber length is less than 2 mm, the physical properties such as the rigidity of the resin composition and the molded product thereof may be lowered, while if it exceeds 20 mm, the moldability (fluidity) may be lowered.

The fiber length represents the length when the glass fiber before melt-kneading is used as it is as a raw material in the case of a normal roving-like or strand-like fiber. However, in the case of a glass fiber-containing pellet that has been melt-extruded to be described later and a large number of continuous glass fibers are aggregated and integrated, the length of one side (extrusion direction) of the pellet is substantially the length of the fiber in the pellet. Since it is the same as the above, the length of one side (extrusion direction) of the pellet is defined as the length of the fiber.
Here, "substantially" means, specifically, the length of the glass fiber-containing pellet at 50% or more, preferably 90% or more, based on the total number of fibers in the fiber-containing pellet. It is the same as (extrusion direction), and means that the fibers are hardly broken during the preparation of the pellets.

The fiber length is measured with a microscope and obtained by calculating the average value of the lengths of 100 or more fibers.
For specific measurement, for example, when the fiber (a) is a glass fiber, the glass fiber is mixed with a surfactant-containing water, the mixed water solution is dropped and diffused on a thin glass plate, and then a digital microscope (for example, Keyence) is used. By the method of measuring the fiber length of 100 or more fibers using VHX-900 type manufactured by the same company and calculating the average value.

The fiber diameter of the glass fiber is preferably 3 to 25 μm, more preferably 6 to 20 μm. If the fiber diameter is less than 3 μm, the glass fiber may be easily broken during the production and molding of the resin composition and its molded body, while if it exceeds 25 μm, the aspect ratio of the fiber is lowered. As a result, each improvement effect such as the rigidity of the resin composition and its molded body may decrease.

The fiber diameter is obtained by cutting the fiber perpendicularly to the fiber length direction, observing the cross section under a microscope, measuring the diameter, and calculating the average value of the diameters of 100 or more fibers.

Both surface-treated and untreated glass fibers can be used, but in order to improve dispersibility in polypropylene-based resins, organic silane coupling agents, fatty acid coupling agents, and aluminate can be used. It is preferable to use a coupling agent, a zirconate coupling agent, a silicone compound, a higher fatty acid, a fatty acid metal salt, a fatty acid ester, or the like.

Further, the glass fiber may be one that has been focused (surface) treated with a sizing agent, and the types of the sizing agent include an epoxy-based sizing agent, an aromatic urethane-based sizing agent, an aliphatic urethane-based sizing agent, and acrylic. Examples thereof include a system-based focusing agent and a maleic anhydride-modified polyolefin-based focusing agent. Since these sizing agents need to be melted in melt-kneading with a polypropylene-based resin, they are preferably melted at 200 ° C. or lower.

Examples of the organic silane coupling agent used for surface treatment include vinyltrimethoxysilane, γ-chloropropyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-aminopropyltrimethoxysilane, and 3-acryloxypropyl. Examples thereof include trimethoxysilane. Examples of the titanate coupling agent include isopropyltriisostearoyl titanate, isopropyltris (dioctylpyrophosphate) titanate, and isopropyltri (N-aminoethyl) titanate. Moreover, as an aluminumate coupling agent, for example, acetalkoxyaluminum diisopropyrate and the like can be mentioned. Examples of the zirconate coupling agent include tetra (2,2-diallyloxymethyl) butyl, di (tridecylic) phosphatidylconate; neopentyl (diallyl) oxy, and trineodecanoylzirconate. Further, examples of the silicone compound include silicone oil and silicone resin.

Further, examples of the higher fatty acid used for surface treatment include oleic acid, capric acid, lauric acid, palmitic acid, stearic acid, montanic acid, kaleinic acid, linoleic acid, loginic acid, linolenic acid, undecanoic acid, undecenoic acid and the like. Can be mentioned. Examples of the higher fatty acid metal salt include fatty acids having 9 or more carbon atoms, such as sodium salts such as stearic acid and montanic acid, lithium salts, calcium salts, magnesium salts, zinc salts and aluminum salts. Of these, calcium stearate, aluminum stearate, calcium montanate, and sodium montanate are preferable. Examples of the fatty acid ester include polyhydric alcohol fatty acid esters such as glycerin fatty acid ester, alpha sulfone fatty acid ester, polyoxyethylene sorbitan fatty acid ester, sorbitan fatty acid ester, polyethylene fatty acid ester, and sucrose fatty acid ester.

The amount of the surface treatment agent used is not particularly limited, but is preferably 0.01 parts by weight to 5 parts by weight, more preferably 0.1 parts by weight to 3 parts by weight, based on 100 parts by weight of the glass fiber. ..

The glass fiber can also be used as a so-called chopped strand-shaped glass fiber obtained by cutting a fiber raw yarn to a desired length. Among these, from the viewpoints of low shrinkage, rigidity, impact strength, etc. of the resin composition and its molded body, chopped strand-shaped glass fibers obtained by aligning strands in which glass fibers are converged and cutting them to 2 mm to 20 mm can be obtained. It is preferable to use it.
Specific examples of the glass fiber include those manufactured by Nippon Electric Glass Co., Ltd. (T480H).

Further, these glass fibers can be used as "glass fiber-containing pellets" by collectively integrating a large number of continuous glass fibers by melt-extrusion processing with an arbitrary amount of, for example, polypropylene resin in advance, and have a resin composition. It is preferable from the viewpoint of further enhancing each improvement effect such as the rigidity of the object and its molded body.

In the case of such a glass fiber-containing pellet, as described above, the fiber length is preferably 2 to 20 mm in terms of the length (extrusion direction) of the glass fiber-containing pellet.
The method for producing such glass fiber-containing pellets is not particularly limited, and a known method can be used.

Carbon fiber The carbon fiber can be used without particular limitation. Here, the carbon fiber includes, for example, an ultrafine fiber having a fiber diameter of 500 nm or less, which is also referred to as a fine carbon fiber. In addition, two or more types of carbon fibers can be used in combination.

The fiber length of the carbon fiber is preferably 1 to 20 mm, more preferably 3 to 10 mm. When the fiber length of the carbon fiber is less than 1 mm, the final fiber length in the resin composition and its molded body becomes shorter, and the physical properties such as low shrinkage, rigidity and impact strength of the resin composition and its molded body are deteriorated. On the other hand, if it exceeds 20 mm, the moldability (fluidity) may be lowered.
The length of the carbon fiber is measured by the same method as that of the glass fiber described above.

The fiber diameter of the carbon fiber is preferably 2 to 20 μm, more preferably 3 to 15 μm. If the fiber diameter is less than 2 μm, the carbon fibers may be easily broken during the production and molding of the resin composition and its molded body, and the effects of improving the physical properties such as the rigidity of the resin composition and its molded body are improved. Etc. may decrease. Further, if the fiber diameter exceeds 20 μm, the aspect ratio of the fiber is lowered, and the effect of improving the rigidity of the resin composition and its molded product may be lowered.
The fiber diameter is measured by a known method, for example, ISO11567 / 1995 or microscopic observation.

The type of carbon fiber is not particularly limited as described above, but for example, PAN (polyacrylonitrile) carbon fiber whose main raw material is acrylonitrile, pitch carbon fiber whose main raw material is tar pitch, and rayon carbon fiber. Etc., and all of them are preferably used. All of these are highly suitable for the present invention, but PAN-based carbon fibers are preferable from the viewpoint of composition purity and uniformity. In addition, each of these may be used alone or in combination. The method for producing these carbon fibers is not particularly limited.

Specific examples of carbon fibers include Mitsubishi Rayon's product name "Pyrofil", Toray's product name "Treca", and Toho Tenax's product name "Ves Fight". Examples of pitch-based carbon fibers include the product name "Dialed" manufactured by Mitsubishi Resin Co., Ltd., the product name "Donna Carbo" manufactured by Osaka Gas Chemical Co., Ltd., and the product name "Kureka" manufactured by Kureha Chemical Co., Ltd.

Further, these carbon fibers are "carbon fiber-containing pellets" in which a large number of continuous carbon fibers are aggregated and integrated by melt-extrusion processing with an arbitrary amount of, for example, a polypropylene resin in advance, as in the case of the above-mentioned glass fibers. , Which is preferable from the viewpoint of further enhancing each improvement effect such as the rigidity of the resin composition and its molded body.

In the case of such carbon fiber-containing pellets, as described above, the length of the carbon fibers is preferably 2 to 20 mm in the length (extrusion direction) of the carbon fiber-containing pellets.

The carbon fiber usually has a tensile elastic modulus of about 200 to 1000 GPa, but in the present invention, it is preferable to use a carbon fiber of 200 to 900 GPa from the viewpoint of the strength and economic efficiency of the resin composition of the present invention and its molded product. It is more preferable to use the one of 200 to 300 GPa. Further, the carbon fiber has a density of usually about 1.7~5g / cm ^3, it is preferred to use one from such light weight and economy has a density of 1.7~2.5g / cm ^3.

These carbon fibers can also be used as so-called chopped (strand-shaped) carbon fibers (hereinafter, also simply referred to as CCF) in which the fiber raw yarn is cut to a desired length, and various sizing agents are required. It may be focused using. In the present invention, it is preferable to use this CCF in order to further enhance the effects of improving physical properties such as rigidity in the resin composition and the molded product thereof.

Specific examples of such CCF include Mitsubishi Rayon's product name "Pyrofil Chop", Toray's product name "Treca Chop", and Toho Tenax's product name "Ves Fight Chop" for PAN-based carbon fiber. For pitch-based carbon fibers, the product name "Dialed Chopped Fiber" manufactured by Mitsubishi Resin Co., Ltd., the product name "Donna Carbo Chop" manufactured by Osaka Gas Chemical Co., Ltd., and the product name "Kureka Chop" manufactured by Kureha Chemical Co., Ltd. Can be mentioned.

Further, in the carbon fiber-containing pellets, the carbon fiber content is preferably 20 to 70% by weight based on 100% by weight of the entire pellet.
When carbon fiber-containing pellets having a carbon fiber content of less than 20% by weight are used in the present invention, the physical properties such as low shrinkage, scratch resistance, rigidity and impact strength of the fiber reinforced composition and its molded product are deteriorated. On the other hand, if a material exceeding 70% by weight is used, the moldability (fluidity) or the like may be deteriorated.

Fiber reinforced polypropylene resin composition (c)
The content ratio of the fiber (a) used in the present invention is 1% by weight to 60% by weight, preferably 5% by weight to 55% by weight, and more preferably 10% by weight to 50% by weight with respect to the polypropylene resin (a). It is% by weight. When the content ratio of the fiber (a) is within the above range, excellent physical properties such as low shrinkage and high rigidity are exhibited.
Here, the content ratio of the fiber (a) is an actual amount, and for example, when the glass fiber-containing pellet is used, it is calculated based on the actual content of the fiber (a) contained in the pellet.

The fiber-reinforced polypropylene-based resin composition (c) of the present invention contains, as an optional additive component, a thermoplastic elastomer, a modified polyolefin, a molecular weight lowering agent, a moisturizer, an antioxidant, etc., as long as the effects of the present invention are not significantly impaired. Various optional additive components can be contained.
Two or more kinds of optional additive components may be used in combination, or may be added to the resin composition, and two or more kinds of each component may be used in combination. In the present invention, the content ratio of the optional additive component is not particularly limited, but is usually about 0.01 to 0.5 parts by weight in 100 parts by weight of the resin composition, and is appropriately selected depending on the purpose.

The thermoplastic elastomer in the present specification represents a thermoplastic elastomer selected from olefin-based elastomers, styrene-based elastomers, and the like.
Examples of the olefin-based elastomer include ethylene / propylene copolymer elastomer (EPR), ethylene / butene copolymer elastomer (EBR), ethylene / hexene copolymer elastomer (EHR), and ethylene / octene copolymer elastomer (EOR). ) And other ethylene / α-olefin copolymer elastomers; ethylene / α-olefin / diene three such as ethylene / propylene / ethylidene norbornene copolymers, ethylene / propylene / butadiene copolymers, and ethylene / propylene / isoprene copolymers. Examples include the original copolymer elastomer.
Examples of the styrene-based elastomer include styrene / butadiene / styrene triblock copolymer elastomer (SBS), styrene / isoprene / styrene triblock copolymer elastomer (SIS), and styrene-ethylene / butylene copolymer elastomer (SIS). SEB), styrene-ethylene / propylene copolymer elastomer (SEP), styrene-ethylene / butylene-styrene copolymer elastomer (SEBS), styrene-ethylene / butylene-ethylene copolymer elastomer (SEBC), hydrogenated styrene. Butadiene elastomer (HSBR), styrene-ethylene / propylene-styrene copolymer elastomer (SEPS), styrene-ethylene / ethylene / propylene-styrene copolymer elastomer (SEEPS), styrene-butadiene-butylene-styrene copolymer elastomer (SEEPS) SBBS) and the like.
Further, hydrogenated polymer-based elastomers such as ethylene-ethylene / butylene-ethylene copolymer elastomer (CEBC) can also be mentioned.
Above all, when at least one selected from the group consisting of an ethylene / octene copolymer elastomer (EOR), an ethylene / butene copolymer elastomer (EBR) and an ethylene / propylene copolymer elastomer is used, a resin composition and a molded product thereof are used. In the above, it is preferable from the viewpoint that the performance such as low shrinkage, tactile sensation and impact strength is more excellent, and the economy tends to be excellent.
In addition, two or more kinds of thermoplastic elastomers can be used together.

The modified polyolefin is an acid-modified polyolefin and / or a hydroxy-modified polyolefin, and by improving the interfacial strength between the polypropylene-based resin (a) and the fiber (b), the resin composition and its molded product have rigidity and impact strength. It is effective for improving physical properties such as.
The acid-modified polyolefin is not particularly limited, and conventionally known ones can be used. Examples of the acid-modified polyolefin include polyethylene, polypropylene, ethylene-α-olefin copolymer, ethylene-α-olefin non-conjugated diene compound copolymer (EPDM, etc.), ethylene-aromatic monovinyl compound-conjugated diene compound copolymer rubber, and the like. The above-polymer is graft-copolymerized with an unsaturated carboxylic acid such as maleic acid or maleic anhydride and modified. This graft copolymerization is carried out, for example, by reacting the above-mentioned polyolefin in an appropriate solvent with an unsaturated carboxylic acid using a radical generator such as benzoyl peroxide. In addition, unsaturated carboxylic acid or a component thereof can be introduced into the polymer chain by random or block copolymerization with a monomer for polyolefin.
The hydroxy-modified polyolefin is a modified polyolefin containing a hydroxyl group. The modified polyolefin may have a hydroxyl group at a suitable site, for example, at the end of the main chain or in the side chain. Examples of the olefin-based resin constituting the hydroxy-modified polyolefin include α-olefins such as ethylene, propylene, butene, 4-methylpentene-1, hexene, octene, nonene, decene, and dodecene, or copolymers thereof. -A copolymer of an olefin and a copolymerizable monomer can be exemplified. As the hydroxy-modified polypropylene, hydroxy-modified polyethylene (for example, low-density, medium-density or high-density polyethylene, linear low-density polyethylene, ultrahigh-molecular-weight polyethylene, ethylene- (meth) acrylic acid ester copolymer, ethylene-vinyl acetate) Polymers, etc.), hydroxy-modified polypropylenes (eg, polypropylene homopolymers such as isotactic polypropylene, random copolymers of propylene and α-olefins (eg, ethylene, butene, hexane, etc.), propylene-α-olefin blocks, etc. Polymers, etc.), hydroxy-modified polypropylene (4-methylpentene-1), and the like.

The molecular weight lowering agent is effective in imparting and improving moldability (fluidity) and the like.
As the molecular weight lowering agent, for example, various organic peroxides, those called decomposition (oxidation) accelerators, and the like can be used, and organic peroxides are preferable.
Examples of the organic peroxide include benzoyl peroxide, t-butyl perbenzoate, t-butyl per acetate, t-butyl peroxyisopropyl carbonate, and 2,5-di-methyl-2,5-di- (benzoyl per). Oxy) hexane, 2,5-di-methyl-2,5-di- (benzoylperoxy) hexin-3, t-butyl-di-peradipate, t-butylperoxy-3,5,5-trimethylhexa Noate, Methyl-ethylketone peroxide, Cyclohexanone peroxide, Di-t-butyl peroxide, Dicumyl peroxide, 2,5-di-methyl-2,5-di- (t-butylperoxy) hexane , 2,5-Di-Methyl-2,5-di- (t-butylperoxy) hexin-3, 1,3-bis- (t-butylperoxyisopropyl) benzene, t-butylcumyl peroxide, 1,1-bis- (t-butylperoxy) -3,3,5-trimethylcyclohexane, 1,1-bis- (t-butylperoxy) cyclohexane, 2,2-bis-t-butylperoxybutane , P-Mentan Hydroperoxide, Di-Isopropylbenzene Hydroperoxide, Cumen Hydroperoxide, t-Butyl Hydroperoxide, p-Simen Hydroperoxide, 1,1,3,3-Tetra-Methylbutyl Hydroperoxide And one or more selected from the group of 2,5-di-methyl-2,5-di- (hydroperoxy) hexane.

The moisturizer is effective in imparting and improving the releasability of the resin composition and its molded product at the time of molding.
Examples of the moisturizer include fatty acid amides such as oleic acid amide, stearic acid amide, erucic acid amide, and behenic acid amide, butyl stearate, and silicone oil.

Antioxidants are effective in preventing quality deterioration of the resin composition and its molded product.
Examples of the antioxidant include phenol-based, phosphorus-based and sulfur-based antioxidants.

Further, the resin composition of the present invention may contain a polyolefin-based resin other than the polypropylene-based resin (a), a thermoplastic resin such as a polyamide resin or a polyester resin, and the like, as long as the effects of the present invention are not significantly impaired. ..
Various products of these optional ingredients are commercially available from many companies, and desired products can be obtained and used according to the purpose.

Production of Fiber Reinforced Polypropylene Resin Composition (C) The fiber reinforced polypropylene resin composition (c) of the present invention comprises polypropylene resin (a) (hereinafter, also referred to as component (a)) and fiber (a). , If necessary, an optional additive component is added, and the mixture is blended in the above-mentioned content ratio by a conventionally known method, and can be produced by undergoing a kneading step of melt-kneading.

Mixing is usually performed using a mixing device such as a tumbler, V blender, ribbon blender, and melt kneading is usually performed using a single-screw extruder, a twin-screw extruder, a Banbury mixer, a roll mixer, a brabender plastograph, a kneader, and stirring. Granulate by (semi) melt-kneading using a kneading device such as a granulator. (Semi) In the case of melt-kneading and granulation, the formulations of the above-mentioned components may be kneaded at the same time, and each component is divided and kneaded in order to improve the performance, that is, for example, first. It is also possible to adopt a method in which a part or all of the component (a) and a part of the fiber (b) are kneaded, and then the remaining components are kneaded and granulated.

In the fiber-reinforced polypropylene-based resin composition (c) of the present invention, the average length of the fibers (a) present in the resin composition pellets or the molded product obtained through the kneading step of melt-kneading is 0.3 mm. As described above, it is preferable to manufacture by a compounding method such that the thickness is preferably 0.4 mm or more and 2.5 mm or less.

In the present specification, the average length of the fiber (a) present in the fiber-reinforced polypropylene resin composition (c) pellet or in the molded body is calculated by using a value measured by a digital microscope. Means the value that was set. For example, when the fiber (a) is a glass fiber, the specific measurement is as follows. After the mixed water solution is dropped and diffused on a thin glass plate, the length of 100 or more glass fibers is measured using a digital microscope (VHX-900 type manufactured by Keyence) and the average value is calculated. It depends on the method.

Further, as a preferable method for producing the fiber-reinforced polypropylene-based resin composition (c), for example, in melt-kneading by a twin-screw extruder, for example, after the component (a) is sufficiently melt-kneaded, the fiber (a) is subjected to a side-feed method. There is a method of dispersing the focused fibers while feeding the fibers by feeding them to minimize the breakage of the fibers.

Further, for example, a so-called stirring granulation method in which the component (a) is stirred at high speed in a Henschel mixer to knead the fiber (a) in the mixture while keeping them in a semi-molten state while minimizing the breakage of the fiber. It is one of the preferable manufacturing methods because it is easy to disperse the fibers.
Further, the components excluding the fiber (a) are melt-kneaded in advance with an extruder or the like to form pellets, and the pellets are referred to as so-called "fiber (a) -containing pellets" such as the above-mentioned glass fiber-containing pellets and carbon fiber-containing pellets. A method for producing a fiber-reinforced composition by mixing the above is also one of the preferable production methods for the same reason as described above.

As described above, as a preferable method for producing the fiber-reinforced polypropylene-based resin composition (c) of the present invention, there is a method of adding the fiber (a) after kneading the components other than the fiber (a) in the kneading step. The fiber-reinforced polypropylene-based resin composition (c) of the present invention can be produced by an easy production method.

Manufacture of molded article The molded article of the present invention is an injection molding (gas injection molding, two-color injection molding, core back injection molding, sandwich injection) of the fiber-reinforced polypropylene-based resin composition (c) produced by the above method. It can be obtained by molding by a well-known molding method such as (including molding), injection compression molding (press injection), extrusion molding, sheet molding and hollow molding. Of these, it is preferable to obtain by injection molding or injection compression molding.

Decorative molded body The molded body to be decorated (to be decorated) in the present invention is a molded body made of a fiber-reinforced polypropylene-based resin composition (c), and is difficult to adhere to because it is a non-polar resin. The decorative film in the present invention includes a layer (II) made of a polypropylene resin (B) or a seal layer (I) made of a polypropylene resin (A), so that the decorative film can be made of a polypropylene resin. When the decorative film is attached, it exhibits extremely high adhesive strength, and the decorative film covers the fiber shape that emerges on the surface of the decorative object, so that the appearance of the surface of the decorative molded body becomes smooth.

The arithmetic average roughness Ra measured according to ISO4287 / 1997 on the surface side of the adhered polypropylene-based decorative film of the decorative molded product needs to be 2.0 μm or less, and is preferably 1. It is 8 μm or less. Within the above range, unevenness is not felt and the texture is good.

The decorative molded body obtained by attaching the decorative film of the present invention to various molded bodies formed of a fiber-reinforced polypropylene-based resin composition in a three-dimensional shape has excellent physical properties such as low shrinkage, rigidity and impact strength. Since the surface appearance is smooth, it has an excellent feel, and since VOC contained in paints and adhesives is greatly reduced, it is suitable for use as automobile parts, home appliances, vehicles (railroads, etc.), building materials, daily necessities, etc. be able to.

1 (a) to 1 (b) are explanatory views schematically illustrating a cross section of an embodiment of a decorative molded body in which a decorative film is attached to a resin molded body. In FIGS. 1 (a) to 1 (b), the arrangement of the layer (II) is specified and described for ease of understanding, but the layer structure of the decorative molded product is interpreted only by these examples. is not it. In the present specification, reference numeral 1 is a decorative film, reference numeral 2 is a layer (II), reference numeral 3 is a seal layer (I), reference numeral 4 is a surface decorative layer (III), and reference numeral 5 is a resin molded body. .. 1 (a) and 1 (b) are examples in which the decorative film is made of a multilayer film. In the decorative molded body of FIG. 1 (a), the decorative film is composed of a layer (II) and a seal layer (I), and the seal layer (I) is attached to the surface of the resin molded body 5 to form a seal layer (I). ), The layer (II) is laminated. In the decorative molded body of FIG. 1 (b), the decorative film is composed of a layer (II), a seal layer (I) and a surface decorative layer (III), and the seal layer (I) is formed on the surface of the resin molded body 5. The layer (II) and the surface decorative layer (III) are laminated on the seal layer (I) in this order.

Method for manufacturing a decorative molded body In the method for manufacturing a decorative molded body of the present invention, the above-mentioned step of preparing a decorative film, a step of preparing a resin molded body, the resin molded body and the resin molded body in a decompressable chamber box. A step of setting the decorative film (a step of setting the resin molded body and the seal layer of the decorative film so as to face each other if there is a seal layer), a step of reducing the pressure in the chamber box, and the above. It is characterized by including a step of heating and softening the decorative film, a step of pressing the decorative film against the resin molded body, and a step of returning or pressurizing the inside of the depressurized chamber box to atmospheric pressure.

In three-dimensional decorative thermoforming, a decorative object and a decorative film are set in a chamber box that can be depressurized, the film is heated and softened while the inside of the chamber box is depressurized, and the film is pressed against the decorative object. It has a basic process of attaching the decorative film to the surface of the object to be decorated by returning the inside of the chamber box to atmospheric pressure or pressurizing it, and the film is attached under reduced pressure. As a result, it is possible to obtain a clean decorative molded product that does not generate air pools. In the manufacturing method of the present invention, any known technique can be used as long as the apparatus and conditions are suitable for three-dimensional decorative thermoforming.

That is, the chamber box may contain all of the decoration target, the decoration film, the mechanism for pressing the decoration film, the device for heating the decoration film, and the like, or the decoration film may be used. It may be a plurality of divided ones.
Further, the mechanism for pressing the decorative object and the decorative film may be any type of one that moves the decorative object, one that moves the decorative film, and one that moves both.

More specifically, a typical molding method is illustrated below.
Hereinafter, a method of attaching a decorative film to a decorative object by using a three-dimensional decorative thermoforming machine will be exemplified with reference to the drawings.

As shown in FIG. 2, the three-dimensional decorative thermoforming machine of this embodiment includes chamber boxes 11 and 12 at the top and bottom, and thermoforms the decorative film 1 in the two chamber boxes 11 and 12. I am doing it. A vacuum circuit (not shown) and an air circuit (not shown) are piped to the upper and lower chamber boxes 11 and 12, respectively.

Further, a jig 13 for fixing the decorative film 1 is provided between the upper and lower chamber boxes 11 and 12. Further, a table 14 capable of ascending / descending is installed in the lower chamber box 12, and the resin molded body (decoration target) 5 is set on the table 14 (via a jig or the like or directly). NS. A heater 15 is incorporated in the upper chamber box 11, and the decorative film 1 is heated by the heater 15. The decoration target 5 can use a fiber-reinforced polypropylene-based resin composition as a substrate.

As such a three-dimensional decorative thermoforming machine, a commercially available molding machine (for example, NGF series manufactured by Fuse Vacuum Co., Ltd.) can be used.

As shown in FIG. 3, first, with the upper and lower chamber boxes 11 and 12 open, the decoration target 5 is placed on the table 14 in the lower chamber box 12, and the table 14 is lowered. Subsequently, if the decorative film 1 is provided on the jig 13 for fixing the film between the upper and lower chamber boxes 11 and 12, if the seal layer (I) is present, the decorative film 1 is set so that the seal layer (I) faces the substrate.

As shown in FIG. 4, the upper chamber box 11 is lowered, the upper and lower chamber boxes 11 and 12 are joined to close the inside of the box, and then the insides of the respective chamber boxes 11 and 12 are put into a vacuum suction state, and the heater 15 is used. The decorative film 1 is heated by the above method.

After the decorative film 1 is heated and softened, as shown in FIG. 5, the table 14 in the lower chamber box 12 is raised while the upper and lower chamber boxes 11 and 12 are in a vacuum suction state. The decorative film 1 is pressed against the decorative object 5 to cover the decorative object 5. Further, as shown in FIG. 6, by opening the upper chamber box 11 under atmospheric pressure or supplying compressed air from the pneumatic tank, the decorative film 1 is brought into close contact with the decorative object 5 with a larger force.
Subsequently, the inside of the upper and lower chamber boxes 11 and 12 is opened under atmospheric pressure, and the decorative molded body 6 is taken out from the lower chamber box 12. Finally, as illustrated in FIG. 7, the edges of the unnecessary decorative film 1 around the decorative molded body 6 are trimmed.

Molding conditions The depressurization in the chamber boxes 11 and 12 may be as long as no air pool is generated, and the pressure in the chamber box is 10 KPa or less, preferably 3 KPa, more preferably 1 KPa or less.

Further, in the two chamber boxes 11 and 12 divided into upper and lower parts by the decorative film 1, the pressure inside the chamber box on the side to which the decorative object 5 and the decorative film 1 are attached may be within this range, and the upper and lower chamber boxes may be up and down. The drawdown of the decorative film 1 can be suppressed by changing the pressures of the chamber boxes 11 and 12 of the above.
At this time, a film made of a general polypropylene-based resin may be significantly deformed and ruptured by a slight pressure fluctuation due to a decrease in viscosity during heating.
The decorative film 1 of the present invention is not only difficult to draw down, but also resistant to film deformation due to pressure fluctuations.

The heating of the decorative film 1 is controlled by the heater temperature (output) and the heating time. It is also possible to measure the surface temperature of the film with a thermometer such as a radiation thermometer and use it as a guideline for appropriate conditions.

In the present invention, in order to attach the polypropylene-based decorative film 1 to the decorative object 5 made of polypropylene-based resin, it is necessary that the surface of the resin molded body 5 and the decorative film 1 are sufficiently softened or melted.
Therefore, the heater temperature needs to be higher than the melting temperature of the polypropylene-based resin constituting the decoration target 5 and the polypropylene-based resin constituting the decoration film 1. The heater temperature is preferably 160 ° C. or higher, more preferably 180 ° C. or higher, and most preferably 200 ° C. or higher.

The higher the heater temperature, the shorter the time required for heating, but the heater side is sufficiently heated until the inside of the decorative film 1 (or the surface opposite to the heater when the heater is installed on only one side) is sufficiently heated. The heater temperature is preferably 500 ° C. or lower, more preferably 450 ° C. or lower, and most preferably 400 ° C. It is as follows.

The appropriate heating time depends on the heater temperature, but it is preferable that the polypropylene-based decorative film is heated at least until the polypropylene-based decorative film is heated and the rebounding called springback is started.
That is, the decorative film heated by the heater expands thermally when heated from the solid state and sags once as the crystal melts, and when the crystal melt progresses, the molecules relax and the springback temporarily rebounds. Is observed, and then it hangs down due to its own weight. However, after springback, the crystals of the film are completely melted and the molecules are sufficiently relaxed, so that sufficient adhesive strength can be obtained.
On the other hand, if the heating time is too long, the film may hang down due to its own weight or may be deformed due to the pressure difference between the upper and lower chamber boxes. Therefore, the heating time is preferably less than 120 seconds after the end of springback.

When decorating a molded product having a complicated shape having irregularities or achieving higher adhesive strength, it is preferable to supply compressed air when the decorative film is brought into close contact with the substrate. The pressure in the upper chamber box when compressed air is introduced is 150 kPa or more, preferably 200 kPa or more, and more preferably 250 kPa or more. The upper limit is not particularly limited, but if the pressure is too high, the equipment may be damaged. Therefore, 450 kPa or less, preferably 400 kPa or less is preferable.

Hereinafter, the present invention will be described in more detail as examples, but the present invention is not limited to this embodiment. In the following description, examples other than Examples 15 to 21 are treated as reference examples.

1. 1. Measurement method of various physical properties (i) MFR
Measured at 230 ° C. with a 2.16 kg load according to ISO 1133: 1997 Connections M. The unit is g / 10 minutes.

(Ii) Melting peak temperature Tm:
Using a differential scanning calorimeter (DSC), once the temperature was raised to 200 ° C. and held for 10 minutes, the temperature was lowered to 40 ° C. at a temperature lowering rate of 10 ° C./min, and then again at a temperature rise rate of 10 ° C./min. The temperature at the top of the endothermic peak at the time of measurement was defined as the melting peak temperature Tm. The unit is ° C.

(Iii) GPC measurement GPC measurement was performed under the following equipment and conditions, and Mw / Mn was calculated.
-Device: Waters GPC (ALC / GPC 150C)
-Detector: MIRAN 1A IR detector manufactured by FOXBORO (measurement wavelength: 3.42 μm)
-Column: Showa Denko AD806M / S (3)
-Mobile phase solvent: orthodichlorobenzene (ODCB)
・ Measurement temperature: 140 ° C
-Flow velocity: 1.0 ml / min
・ Injection amount: 0.2 ml
-Sample preparation: As a sample, prepare a 1 mg / mL solution using ODCB (containing 0.5 mg / mL BHT) and dissolve it at 140 ° C. in about 1 hour.
The conversion from the holding capacity obtained by GPC measurement to the molecular weight is performed using a calibration curve made of standard polystyrene (PS) prepared in advance. The standard polystyrenes used are all the following brands manufactured by Tosoh Corporation.
F380, F288, F128, F80, F40, F20, F10, F4, F1, A5000, A2500, A1000
A calibration curve is created by injecting 0.2 mL of solution dissolved in ODCB (containing 0.5 mg / mL BHT) so that each is 0.5 mg / mL. The calibration curve uses a cubic equation obtained by approximating with the least squares method.
The following numerical values are used for the viscosity formula [η] = K × M ^{α used for conversion to the molecular weight.}
PS: K = 1.38 × 10 ^-4 , α = 0.7
PP: K = 1.03 × 10 ^-4 , α = 0.78

2. 2. Materials used (1) Polypropylene resin The following polypropylene resin was used.
(A-1): Metallocene-catalyzed propylene-α-olefin copolymer (MFR = 7 g / 10 minutes, Tm = 125 ° C., Mw / Mn = 2.5), manufactured by Japan Polypropylene Corporation, trade name "Win". Tech (registered trademark) WFX4M "
(A-2): Metallocene-catalyzed propylene-α-olefin copolymer (MFR = 25 g / 10 minutes, Tm = 125 ° C., Mw / Mn = 2.4), manufactured by Japan Polypropylene Corporation, trade name "Win". Tech (registered trademark) WSX03 "
(A-3): Metallocene-catalyzed propylene-α-olefin copolymer (MFR = 7 g / 10 minutes, Tm = 135 ° C., Mw / Mn = 2.3), manufactured by Japan Polypropylene Corporation, trade name "Win". Tech (registered trademark) WFW4M "
(A-4) Metallocene-catalyzed propylene-α-olefin copolymer (MFR = 3.5 g / 10 minutes, Tm = 143 ° C., Mw / Mn = 2.8), manufactured by Japan Polypropylene Corporation, trade name " Wintech (registered trademark) WFW5T "
(A-5): Metallocene-catalyzed propylene-α-olefin copolymer (MFR = 30 g / 10 minutes, Tm = 145 ° C., Mw / Mn = 2.4), manufactured by Japan Polypropylene Corporation, trade name "Win". Tech (registered trademark) WMG03 "
(A-6): Ziegler-Natta-catalyzed propylene-α-olefin copolymer (MFR = 7 g / 10 minutes, Tm = 146 ° C., Mw / Mn = 4.0), manufactured by Japan Polypropylene Corporation, trade name. "Novatec (registered trademark) FW3GT"

(B-1): Ziegler-Natta-catalyzed propylene homopolymer (MFR = 0.4 g / 10 minutes, Tm = 161 ° C), manufactured by Japan Polypropylene Corporation, trade name "Novatec (registered trademark) EA9"
(B-2): Ziegler-Natta-catalyzed propylene homopolymer (MFR = 2.4 g / 10 minutes, Tm = 161 ° C), manufactured by Japan Polypropylene Corporation, trade name "Novatec (registered trademark) FY6"
(B-3): Polypropylene resin composition, MFR = 0, in which 96% by weight of polypropylene resin (B-1) is blended with 4% by weight of black pigment MB (EPP-K-120601 manufactured by Polycol Kogyo Co., Ltd.). .4 g / 10 minutes, Tm = 161 ° C
(D-1): Ziegler-Natta-catalyzed propylene homopolymer (MFR = 10 g / 10 minutes, Tm = 161 ° C), manufactured by Japan Polypropylene Corporation, trade name "Novatec (registered trademark) FA3KM"
(D-2): Polypropylene resin (D-1) 100 parts by weight blended with 0.4 parts by weight of a nucleating agent (trade name "Milllad NX8000J" manufactured by Milliken Japan Co., Ltd.) Composition (MFR = 10 g / 10 minutes, Tm = 164 ° C)
(D-3): Polypropylene resin composition blended with 100 parts by weight of polypropylene resin (A-1) by 0.4 parts by weight of a nucleating agent (trade name "Milllad NX8000J" manufactured by Milliken Japan Co., Ltd.). (MFR = 7 g / 10 minutes, Tm = 127 ° C)
(D-4): Polypropylene resin (D-1) 96% by weight with MFR = 11 g / 10 min white pigment MB (EPP-W-59578 manufactured by Polycol Kogyo Co., Ltd., titanium oxide content 80% by weight). Polypropylene resin composition blended by 4% by weight (MFR = 10 g / 10 minutes, Tm = 161 ° C.)
(D-5): Polypropylene resin composition (MFR = 10 g / 10) in which 96% by weight of polypropylene resin (D-1) is blended with 4% by weight of silver pigment MB (PPCM913Y-42 SILVER21X manufactured by Toyo Color Co., Ltd.). Minutes, Tm = 161 ° C)

(A-1): Ziegler-Natta-catalyzed propylene homopolymer (MFR = 40 g / 10 minutes, Tm = 158 ° C), manufactured by Japan Polypropylene Corporation, trade name "Novatec (registered trademark) MA04A"
(A-2): A grade having the following composition under the trade name "Novatec (registered trademark)" manufactured by Japan Polypropylene Corporation was used.
It is a propylene / ethylene block copolymer polymerized using a Cheegler-Natta catalyst. The melting peak temperature Tm of the entire propylene / ethylene block copolymer is 161 ° C, and the MFR (230 ° C, 2.16 kg load) is 28 g / g. 10 minutes, the content of the propylene homopolymer portion with respect to the entire propylene / ethylene copolymer portion is 73% by weight, the content of the propylene / ethylene copolymer portion is 27% by weight, and the ethylene content of the propylene / ethylene copolymer portion. Is 37% by weight.

(2) Fiber (a)
(A-1): Glass fiber manufactured by Nippon Electric Glass Co., Ltd., "T480H", chopped strand, fiber diameter 10 μm, fiber length 4 mm
(A-2): Carbon fiber manufactured by Mitsubishi Rayon, trade name "Pyrofil TR066A", fiber diameter 7 μm, fiber length 6 mm

(3) Fiber-reinforced polypropylene-based resin composition (c)
(C-1) to (C-6): The components (a) and (b) were blended in the proportions shown in Table 1 and kneaded and granulated under the following conditions to obtain resin composition pellets.
Kneading device: "KZW-15-MG" type twin-screw extruder manufactured by Tech Novel Co., Ltd. Kneading conditions: Extrusion temperature = 200 ° C., screw rotation speed = 400 rpm, discharge rate = 3 kg / h
The fibers (a) were blended and kneaded by a method of side-feeding from a position 2 barrels before the tip of the extruder using a side feeder so as to have a predetermined concentration.

(U-7): Made by Japan Polypropylene Corporation, trade name "Funkster (registered trademark) LR24A", glass fiber content is 40% by weight, polypropylene resin (a) applicable component content is 60% by weight, glass fiber length. 8mm

3. 3. Production of Resin Molded Body (Base) The fiber-reinforced polypropylene-based resin compositions (c-1) to (c-7) were injection-molded by the following methods to obtain a resin molded body (base).
Injection molding machine: "IS100GN" manufactured by Toshiba Machine Co., Ltd., mold clamping pressure 100 tons Cylinder temperature: 200 ° C
Mold temperature: 40 ° C
Injection mold: Width x height x thickness = 120 mm x 120 mm x 3 mm flat plate Condition adjustment: Hold in a constant temperature and humidity chamber with a temperature of 23 ° C and a humidity of 50% RH for 5 days

(Example 1)
-Manufacturing of decorative film Two types 2 with a lip opening of 0.8 mm and a die width of 400 mm, to which an extruder with a diameter of 40 mm (diameter) and an extruder for a seal layer with a diameter of 30 mm (diameter) -3 are connected. A layer T die was used. A polypropylene-based resin (B-1) is charged into the extruder-1, and a polypropylene-based resin (A-1) is charged into the extruder-3 for a seal layer. The resin temperature is 240 ° C., and the discharge amount of the extruder-1 is 12 kg. The melt extrusion was performed under the conditions of / h and the discharge amount of the seal layer extruder-3 of 4 kg / h.
The melt-extruded film was cooled and solidified by pressing it with an air knife so that the seal layer was in contact with the first roll rotated at 3 m / min at 80 ° C., and the seal layer having a thickness of 50 μm and the layer having a thickness of 150 μm were laminated. Two layers of unstretched film were obtained.

-As the three-dimensional decorative thermoformed resin molded body (base) 5, an injection molded body made of the fiber-reinforced polypropylene-based resin composition (c-1) obtained above was used. As a three-dimensional decorative thermoforming apparatus, "NGF-0406-SW" manufactured by Fuse Vacuum Co., Ltd. was used. As shown in FIGS. 2 to 7, the decorative film 1 is cut out with a width of 250 mm and a length of 350 mm so that the cooling roll contact surface faces the substrate and the longitudinal direction is the MD direction of the film, and the size of the opening is formed. Was set on a film fixing jig 13 having a size of 210 mm × 300 mm. The resin molded body (base) 5 is placed on a sample mounting table having a height of 20 mm, which is installed on a table 14 located below the film fixing jig 13, and is manufactured by Nichiban Co., Ltd. “Nystack NW-K15”. I pasted it through. The film fixing jig 13 and the table 14 were installed in the chambers 11 and 12, and the chamber was closed to close the inside of the chamber boxes 11 and 12. The chamber box is divided into upper and lower parts via the decorative film 1. With the upper and lower boxes vacuum sucked and the pressure reduced from atmospheric pressure (101.3 kPa) to 1.0 kPa, the far-infrared heater 15 installed on the upper chamber box 11 is started at an output of 80% to form the decorative film 1. It was heated. Vacuum suction was continued even during heating, and the pressure was finally reduced to 0.1 kPa. The decorative film 1 is heated and temporarily sags, and then 10 seconds after the springback phenomenon of tensioning is completed, the table 14 installed in the lower chamber box 12 is moved upward to form a resin molded body. The (base) 5 was pressed against the decorative film 1, and immediately after that, compressed air was sent so that the pressure in the upper chamber box 11 became 270 kPa to bring the resin molded body (base) 5 and the decorative film 1 into close contact with each other. In this way, a three-dimensional decorative thermoformed product 6 to which the decorative film 1 was attached to the upper surface and the side surface of the resin molded body (base) 5 was obtained.

・ Evaluation of physical properties (1) Evaluation of thermoformability (appearance of decorative molded product)
Visually observe the draw-down state of the decorative film during three-dimensional decorative thermoforming and the attached state of the decorative film of the decorative molded body in which the decorative film is attached to the substrate. Evaluated in.
◯: During three-dimensional decorative thermoforming, the decorative film was not drawn down and the substrate and the decorative film were in contact with each other at the same time on the entire contact surface, so that contact unevenness did not occur and the film was evenly attached. ing.
Δ: Since the decorative film was slightly drawn down during the three-dimensional decorative thermoforming, it came into contact with the decorative film from the center of the substrate, and uneven contact occurred at the upper end of the substrate.
X: During three-dimensional decorative thermoforming, the decorative film drew down significantly, causing uneven contact on the entire surface of the substrate.

(2) Adhesive strength between the resin molded body (base) and the decorative film Nitoms Co., Ltd. "Craft Adhesive Tape No. 712N" was cut out to a width of 75 mm and a length of 120 mm, and from the end of the resin molded body (base). It was attached to a resin molded body (base) in a range of 75 mm × 120 mm and subjected to masking treatment (the exposed portion on the surface of the base has a width of 45 mm and a length of 120 mm). The masking surface of the resin molded body (base) was installed in the three-dimensional decorative thermoforming apparatus NGF-0406-SW so as to be in contact with the decorative film, and three-dimensional decorative thermoforming was performed.

The decorative film surface of the obtained decorative molded product was cut to the surface of the substrate with a width of 10 mm in a direction perpendicular to the longitudinal direction of the adhesive tape using a cutter to prepare a test piece. In the obtained test piece, the adhesive surface between the substrate and the decorative film has a width of 10 mm and a length of 45 mm. Attached to the tensile tester so that the base part and the decorative film part of the test piece are at 180 °, the 180 ° peel strength of the adhesive surface is measured at a tensile speed of 200 mm / min, and the maximum strength at the time of peeling or breaking is measured. (N / 10 mm) was measured 5 times, and the average strength was taken as the adhesive strength.

(3) Arithmetic mean roughness Ra
The surface of the decorative molded body (area equivalent to 1400 μm in length and 1000 μm in width) to which the decorative film is attached is covered by a shape measurement laser microscope (“VK-X200” manufactured by KEYENCE CORPORATION, magnification 10 times) and an observation application (VK). -H1XV) was used for observation. The obtained observation data was arbitrarily analyzed with 20 points of lateral line roughness using an analysis application (VK-H1XA) compliant with ISO4287 / 1997, and the highest value of the obtained arithmetic mean roughness Ra was obtained. The arithmetic average roughness Ra was used.

(4) Tactile sensation The surface of the decorative molded product to which the decorative film was attached was patted by hand and evaluated according to the criteria shown below.
◯: The fiber-shaped unevenness on the surface is not felt, and the texture is good.
Δ: Unevenness is felt in various places, and there are parts that are uncomfortable to the touch.
×: Unevenness is felt as a whole, and the texture is poor.

(5) Gloss The gloss near the center of the decorative molded product to which the decorative film is attached was measured at an incident angle of 60 ° using a GLOSS meter Gloss Meter VG2000 manufactured by Nippon Denshoku Kogyo Co., Ltd. .. The measuring method was based on JIS K7105-1981.

Table 2 shows the results of evaluation of the physical properties of the obtained decorative molded product and the like.
Since all the requirements of the present invention are satisfied, the obtained decorative molded product is excellent in appearance and adhesive strength, does not feel unevenness peculiar to the fiber shape, and is excellent in touch.

(Examples 2 to 7)
In the three-dimensional decorative thermoforming described in Example 1, the same as in Example 1 except that the resin molded body (base) 5 is changed to the fiber-reinforced polypropylene-based resin compositions (c-2) to (c-7). Was evaluated. The evaluation results are shown in Table 2.
Since all of them satisfy all the requirements of the present invention, the obtained decorative molded product was excellent in appearance and adhesive strength, did not feel the unevenness peculiar to the fiber shape, and was excellent in touch.

(Examples 8 to 10)
In the production of the decorative film of Example 1, the polypropylene-based resin (A-1) was changed to the polypropylene-based resins (A-2) to (A-4), but the two layers were the same as in Example 1. An unstretched film was obtained.
Using the unstretched film obtained in the above decorative film production, in the three-dimensional decorative thermoforming, except that the resin molded body (base) 5 was changed to the fiber-reinforced polypropylene-based resin composition (U-6). Molding and evaluation were carried out in the same manner as in Example 1. The evaluation results are shown in Table 3.
Since all of them satisfy all the requirements of the present invention, the obtained decorative molded product was excellent in appearance and adhesive strength, did not feel the unevenness peculiar to the fiber shape, and was excellent in touch.

(Example 11)
In the production of the decorative film of Example 1, a two-layer unstretched film was obtained in the same manner as in Example 1 except that the polypropylene-based resin (B-1) was changed to the polypropylene-based resin (B-2). ..
Using the unstretched film obtained in the above decorative film production, in the three-dimensional decorative thermoforming, except that the resin molded body (base) 5 was changed to the fiber-reinforced polypropylene-based resin composition (U-6). Molding and evaluation were carried out in the same manner as in Example 1. The evaluation results are shown in Table 3.
Since all the requirements of the present invention are satisfied, the obtained decorative molded product is excellent in appearance and adhesive strength, does not feel unevenness peculiar to the fiber shape, and is excellent in touch.

(Examples 12 to 14)
Example 1 except that the polypropylene-based resin (A-1) was changed to the polypropylene-based resin (A-2), (A-3), and (A-5) in the production of the decorative film of Example 11. Molding and evaluation were performed in the same manner as above. The evaluation results are shown in Table 3.
Since all of them satisfy all the requirements of the present invention, the obtained decorative molded product was excellent in appearance and adhesive strength, did not feel the unevenness peculiar to the fiber shape, and was excellent in touch.

(Example 15)
In the production of the decorative film of Example 1, an extruder having a diameter of 40 mm (diameter) -1, an extruder having a diameter of 30 mm (diameter) for a surface layer-2, and an extruder having a diameter of 30 mm (diameter) to a seal layer-3. A three-kind three-layer T-die having a lip opening of 0.8 mm and a die width of 400 mm was used. The extruder-1 is a polypropylene resin (B-1), the surface layer extruder-2 is a polypropylene resin (D-1), and the seal layer extruder-3 is a polypropylene resin (A-1). The resin temperature is 240 ° C., the discharge amount of the extruder-1 is 12 kg / h, the discharge amount of the surface layer extruder-2 is 4 kg / h, and the discharge amount of the seal layer extruder-3 is 4 kg / h. The melt extrusion was performed under the conditions of.
The melt-extruded film was cooled and solidified while being pressed with an air knife so that the seal layer was in contact with the first roll rotated at 3 m / min at 80 ° C., and a layer having a thickness of 150 μm and a surface decorative layer having a thickness of 50 μm were cooled and solidified. And, a three-layer unstretched film in which a seal layer having a thickness of 50 μm was laminated was obtained.
Using the unstretched film obtained in the above decorative film production, in the three-dimensional decorative thermoforming, except that the resin molded body (base) 5 was changed to the fiber-reinforced polypropylene-based resin composition (U-6). Molding and evaluation were carried out in the same manner as in Example 1. The evaluation results are shown in Table 3.
Since all of them satisfy all the requirements of the present invention, the obtained decorative molded product was excellent in appearance and adhesive strength, did not feel the unevenness peculiar to the fiber shape, and was excellent in touch. Further, the polypropylene-based resin (D-1) was laminated on the outermost surface side as the surface decorative layer [layer (III)], resulting in excellent gloss.

(Comparative Example 1)
The arithmetic mean roughness Ra evaluation and the tactile sensation evaluation described in Example 1 were performed using only an injection molded product made of a fiber-reinforced polypropylene-based resin composition (c). The results are shown in Table 4.
Since the decorative film was not attached, unevenness peculiar to the fiber shape was observed, and Ra was as high as 2.7 μm, so that the texture was rough and the surface shape was not practical.

(Comparative Examples 2 to 7)
The evaluation was carried out in the same manner as in Comparative Example 1 except that the injection-molded article was changed from the fiber-reinforced polypropylene-based resin composition (c-1) to the injection-molded article from (c-2) to (c-7). The results are shown in Table 4.
Since no decorative film was attached to any of the injection molded products, unevenness peculiar to the fiber shape was observed, and Ra was higher than 2.0 μm, resulting in a rough texture and not a practical surface shape. ..

(Comparative Example 8)
In the production of the decorative film of Example 11, molding and evaluation were carried out in the same manner as in Example 11 except that the polypropylene-based resin (A-1) was changed to the polypropylene-based resin (A-6). The evaluation results are shown in Table 4.
The result was that the adhesive strength was significantly inferior.

(Example 16)
In the production of the decorative film of Example 15, molding and evaluation were carried out in the same manner as in Example 15 except that the polypropylene-based resin (D-1) was changed to the polypropylene-based resin (D-2). The evaluation results are shown in Table 5.
Since all of them satisfy all the requirements of the present invention, the obtained decorative molded product was excellent in appearance and adhesive strength, did not feel the unevenness peculiar to the fiber shape, and was excellent in touch. Further, the polypropylene-based resin (D-2) to which the nucleating agent was added was laminated on the outermost surface side as the surface decorative layer [layer (III)], resulting in excellent gloss.

(Example 17)
In the production of the decorative film of Example 15, molding and evaluation were carried out in the same manner as in Example 15 except that the polypropylene-based resin (D-1) was changed to the polypropylene-based resin (A-1). The evaluation results are shown in Table 5.
Since all of them satisfy all the requirements of the present invention, the obtained decorative molded product was excellent in appearance and adhesive strength, did not feel the unevenness peculiar to the fiber shape, and was excellent in touch. The resin (A-1) was laminated on the outermost surface side as the surface decorative layer [surface layer (III)], resulting in excellent gloss.

(Example 18)
In the production of the decorative film of Example 15, molding and evaluation were carried out in the same manner as in Example 15 except that the polypropylene-based resin (D-1) was changed to the polypropylene-based resin (D-3). The evaluation results are shown in Table 5.
Since all of them satisfy all the requirements of the present invention, the obtained decorative molded product was excellent in appearance and adhesive strength, did not feel the unevenness peculiar to the fiber shape, and was excellent in touch. Further, the polypropylene-based resin (D-3) to which the nucleating agent was added was laminated on the outermost surface side as the surface decorative layer [surface layer (III)], resulting in excellent gloss.

(Example 19)
In the production of the decorative film of Example 15, molding and evaluation were carried out in the same manner as in Example 15 except that the polypropylene-based resin (D-1) was changed to the polypropylene-based resin (D-4). The evaluation results are shown in Table 5.
Since all of them satisfy all the requirements of the present invention, the obtained decorative molded product was excellent in appearance and adhesive strength, did not feel the unevenness peculiar to the fiber shape, and was excellent in touch. Further, since the surface decorative layer (III) [surface layer (III)] having excellent gloss was colored white, the appearance was excellent.

(Example 20)
In the production of the decorative film of Example 15, molding and evaluation were carried out in the same manner as in Example 15 except that the polypropylene-based resin (B-1) was changed to the polypropylene-based resin (B-3). The evaluation results are shown in Table 5.
Since all of them satisfy all the requirements of the present invention, the obtained decorative molded product was excellent in appearance and adhesive strength, did not feel the unevenness peculiar to the fiber shape, and was excellent in touch. Further, since the layer (II) was colored black, the appearance was excellent.

(Example 21)
In the production of the decorative film of Example 20, molding and evaluation were carried out in the same manner as in Example 20 except that the polypropylene-based resin (D-1) was changed to the polypropylene-based resin (D-5). The evaluation results are shown in Table 5.
Since all of them satisfy all the requirements of the present invention, the obtained decorative molded product was excellent in appearance and adhesive strength, did not feel the unevenness peculiar to the fiber shape, and was excellent in touch. Further, since the layer (II) was colored black and the surface decorative layer (III) [surface layer (III)] was colored silver, the film was metallic and had an excellent appearance.

1 Decorative film 2 layers (II)
3 Seal layer (I)
4 Surface decorative layer (III)
5 Resin molded body (decoration target, substrate)
6 Decorative molding 11 Upper chamber box 12 Lower chamber box 13 Jig 14 Table 15 Heater

Claims (5)

A decorative molded body that is a heat-molded product having a laminated body structure in which a resin molded body and a polypropylene-based decorative film are attached, and the polypropylene-based decorative film is a seal layer made of a polypropylene-based resin (A). The layer (II) composed of (I) and the polypropylene-based resin (B) is included, the polypropylene-based resin (A) satisfies the following requirements (a1) to (a4), and the polypropylene-based resin (B) is described below. It is a decorative film satisfying the requirements (b1) to (b2), and the resin molded body is a polypropylene-based resin (a) 40% by weight to 99% by weight satisfying the following requirements (a-i) to (a-ii). A fiber-reinforced polypropylene-based resin containing 1% by weight to 60% by weight of a fiber (a) satisfying the following requirements (i-i) (however, the total amount of (a) and (b) is 100% by weight). a resin composition (c), wherein the polypropylene decorative film and said resin molded body Ri moldings der which is stuck through the sealing layer (I), wherein the polypropylene-based decorative film, the resin A surface decorative layer (III) made of a surface decorative layer resin is provided on a surface opposite to the surface to be attached to the molded body, and the surface decorative layer resin is made of a polypropylene-based resin (D). MFR (230 ° C., 2.16 kg load) of the polypropylene resin (D) is a decorative molded body, characterized in Rukoto exceed 2 g / 10 min.
Polypropylene resin (A)
(A1) The metallocene-catalyzed propylene-based polymer (a2) melt flow rate (230 ° C., 2.16 kg load) (MFR (A)) exceeds 0.5 g / 10 minutes (a3) melting peak temperature (a3). Tm (A)) is less than 150 ° C. (a4) Polypropylene resin (B) having a molecular weight distribution (Mw / Mn (A)) obtained by GPC measurement is 1.5 to 3.5.
(B1) Melt flow rate (230 ° C., 2.16 kg load) (MFR (B)) and MFR (A) satisfy the relational expression (b-1) MFR (B) <MFR (A) ... Equation (b-1),
(B2) The melting peak temperature (Tm (B)) and Tm (A) satisfy the relational expression (b-2). Tm (B)> Tm (A) ... Equation (b-2)
Polypropylene resin (a)
(A-i): The melting peak temperature Tm (a) is 110 ° C. or higher.
(A-ii): MFR (a) (230 ° C., 2.16 kg load) is 0.5 g / 10 minutes or more and 200 g / 10 minutes or less.
Fiber (a)
(I): The fiber (a) is at least one selected from the group consisting of glass fiber and carbon fiber. The decorative molded product according to claim 1, wherein the polypropylene-based resin (A) is a propylene / α-olefin copolymer. The decorative molded product according to claim 1 or 2, wherein Tm (A) is 140 ° C. or lower. Claims 1 to 1, characterized in that the arithmetic average roughness Ra measured according to ISO4287 / 1997 on the surface side of the adhered polypropylene-based decorative film of the decorative molded product is 2 μm or less. The decorative molded body according to any one of 3. The method for producing a decorative molded product according to any one of claims 1 to 4 , wherein a polypropylene-based decorative film is prepared, a resin molded product is prepared, and a decompressable chamber box is used. The step of setting the resin molded body and the decorative film, the step of depressurizing the inside of the chamber, the step of heating and softening the decorative film, the step of pressing the decorative film against the resin molded body, and the step of pressing the inside of the chamber to atmospheric pressure. A method for producing a decorative molded product, which comprises a step of returning or pressurizing.

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