Vehicular molding

Abstract

To provide a vehicular molding having high decorativeness and proper heat resistance.SOLUTION: A vehicular molding 1 comprises a skin 3. The skin 3 contains 50-100 pts.mass of random copolymer polypropylene of a total of 100 pts.mass of a resin component A.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a molding for a vehicle. [Background technology]

[0002] Vehicle moldings are attached to vehicles for decorative purposes (see, for example, Patent Document 1). Vehicle moldings are used by fitting them into grooves provided in the roof of the vehicle body, for example. Because vehicles are heated by sunlight, vehicle moldings are also required to be heat resistant. Ionomers are sometimes used as materials for vehicle moldings to improve decorativeness. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-233143 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when ionomer is used, the heat resistance of the vehicle molding is not necessarily sufficient, and there is a demand for improvement in heat resistance. The present disclosure has been made in view of the above-mentioned circumstances, and aims to provide a vehicle molding that is highly decorative and has good heat resistance. The present disclosure can be realized in the following forms. [Means for solving the problem]

[0005] [1] A molding for a vehicle having a skin, The skin contains 50 parts by mass or more and 100 parts by mass or less of random copolymer polypropylene out of a total of 100 parts by mass of resin component A. [Effects of the Invention]

[0006] The vehicle molding of the present disclosure is highly decorative and highly heat resistant. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 2 is a cross-sectional view showing an example of a molding for a vehicle. [Figure 2] FIG. 2 is a cross-sectional view showing an example of a vehicle molding in an attached state. DETAILED DESCRIPTION OF THE INVENTION

[0008] Here, a preferred example of the present disclosure will be described. [2] A molding for a vehicle, wherein the resin component A has a crystallinity of 5% or more and 45% or less. [3] A molding for a vehicle, comprising a base material portion superimposed on the skin. [4] The substrate contains a resin component B, a rubber component, an oil component, and a filler component, The resin component B contains random copolymer polypropylene, A molding for a vehicle, wherein a ratio of the oil component to the rubber component (the oil component / the rubber component) is equal to or greater than 0.3 and less than 2.5. [5] When the total amount of the resin component B, the rubber component, the oil component, and the filler component is 100 parts by mass, The base material contains 20 parts by mass or more and 50 parts by mass or less of random copolymer polypropylene as the resin component B. [6] When the total amount of the resin component B, the rubber component, the oil component, and the filler component is 100 parts by mass, The base material contains 10 parts by mass or more and 40 parts by mass or less of the rubber component. [7] A molding for a vehicle, wherein the crystallinity of all components constituting the base material is 3% or more and 15% or less. [8] A molding for a vehicle having a base material, the base material containing a resin component B, a rubber component, an oil component, and a filler component, The resin component B contains random copolymer polypropylene, A molding for a vehicle, wherein a ratio of the oil component to the rubber component (the oil component / the rubber component) is equal to or greater than 0.3 and less than 2.5.

[0009] The present disclosure will be described in detail below. In this specification, when a numerical range is indicated using "to" it is intended to include both the lower limit and the upper limit unless otherwise specified. For example, the expression "10 to 20" includes both the lower limit "10" and the upper limit "20". In other words, "10 to 20" has the same meaning as "10 or more and 20 or less".

[0010] 1. Vehicle molding 1 The vehicle molding 1 includes a skin 3. The skin 3 contains 50 parts by mass or more and 100 parts by mass or less of random copolymer polypropylene out of a total of 100 parts by mass of a resin component A. The configuration of an example of the vehicle molding 1 will be described in detail. The vehicle molding 1 is strip-shaped. As shown in FIG. 1, the vehicle molding 1 preferably includes a skin 3 and a base member 5 superimposed on the back side of the skin 3. The cross section of the base member 5 has, for example, a shape including an umbrella portion 7 and a columnar portion 9 protruding from the underside of the umbrella portion 7. The base member 5 forms the main body of the vehicle molding 1. The base member 5 incorporates a strip-shaped metal core material 11 made of iron, stainless steel, or the like. The skin 3 is disposed on the surface of the umbrella portion 7. A pair of elastically deformable lip portions 13, 13 protrude from both side surfaces of the lower end of the base member 5.

[0011] As shown in FIG. 2 , the vehicle molding 1 is attached to a groove 17 provided in a roof 15 or the like of a vehicle body. Specifically, the column portion 9 and the lip portion 13 are fitted into the groove 17. The umbrella portion 7 is disposed on the surface of the vehicle body, closing the groove 17. The width of the groove 17 is narrower than the distance between the tips 13A, 13A of the pair of lip portions 13, 13. As the lip portion 13 inserted into the groove 17 elastically restores its original shape, the lip portions 13, 13 press against the side walls of the groove 17, thereby fixing the vehicle molding 1 in the groove 17.

[0012] (1) Epidermis 3 (1.1) Resin component A As described above, the skin 3 contains random copolymer polypropylene (hereinafter also referred to as "R-PP") in the resin component A. The inclusion of random copolymer polypropylene reduces the crystallinity of the skin 3, improving its transparency. Improved transparency allows for a beautifully designed surface, similar to the use of ionomer. Furthermore, the skin 3 contains random copolymer polypropylene, which provides flexibility. Furthermore, when the skin 3 contains random copolymer polypropylene, for example, in the case where the skin 3 is produced by extrusion molding, shrinkage deformation after extrusion molding is also suppressed. Furthermore, the skin 3 contains random copolymer polypropylene, which provides excellent chemical resistance. However, if the skin 3 contains an ionomer, the chemical resistance will be poor. Furthermore, since the surface 3 contains random copolymer polypropylene, the surface hardness is higher than that of, for example, olefin-based elastomer (TPO) or styrene block copolymer (TPS), and the surface is more resistant to scratches. Furthermore, since the skin 3 contains a random copolymer polypropylene with a high melting point, it becomes less susceptible to deformation than when it contains an ionomer with a low melting point. From the viewpoint of enhancing decorativeness and improving heat resistance, the content of the random copolymer polypropylene is 50 parts by mass or more and 100 parts by mass or less, preferably 60 parts by mass or more and 100 parts by mass or less, and more preferably 80 parts by mass or more and 100 parts by mass or less, per 100 parts by mass of the total of resin component A. Resin component A may contain one or more members selected from the group consisting of homopolypropylene (hereinafter also referred to as "H-PP") and block polypropylene (hereinafter also referred to as "B-PP"). From the viewpoint of improving the surface smoothness of the skin 3 and improving the gloss value (achieving high gloss), the content of the rubber component relative to a total of 100 parts by mass of the resin component A is preferably 10 parts by mass or less, more preferably 5 parts by mass or less, and even more preferably 1 part by mass or less. It is preferable that the resin component A does not contain a rubber component (such as styrene rubber), i.e., it is 0 part by mass.

[0013] (1.1.1) Random copolymer polypropylene (R-PP) Suitable examples of random copolymer polypropylene include random copolymers using propylene and ethylene and / or butene-1 as the polymerized monomers. The random copolymer may be a propylene-ethylene random copolymer obtained by copolymerizing propylene with ethylene, a propylene-butene-1 random copolymer obtained by copolymerizing propylene with butene-1, or a propylene-ethylene-butene-1 random copolymer obtained by copolymerizing propylene with ethylene and butene-1. A random copolymer of propylene and ethylene is preferred. The melt flow rate of the random copolymer polypropylene (JIS K7210 Method A, Condition M, 230°C, 2.16 kg) is not particularly limited. From the viewpoint of extrusion moldability, the melt flow rate is preferably 2 g / 10 min to 50 g / 10 min, more preferably 4 g / 10 min to 40 g / 10 min, and even more preferably 5 g / 10 min to 30 g / 10 min. The random copolymer polypropylenes can be used alone or in combination of two or more. The density of the random copolymer polypropylene is not particularly limited. The density of the random copolymer polypropylene is 0.89 g / cm 3 More than 0.92g / cm 3 The density can be measured as follows: The density is measured in accordance with JIS K7112.

[0014] (1.1.2) Crystallinity of Resin Component A There are no particular limitations on the crystallinity of resin component A. From the viewpoint of increasing the transparency of skin 3, the crystallinity of resin component A is preferably 5% or more and 45% or less, more preferably 10% or more and 40% or less, and even more preferably 15% or more and 35% or less. The crystallinity is determined by DSC measurement. Specifically, the melting point (Tm) and the heat of fusion ΔH are measured by DSC under the following conditions: Using a differential scanning calorimeter (Hitachi High-Tech Science Corporation VG7000), approximately 3 mg of a sample of resin component A was heated from 23°C to 200°C at a heating rate of 20°C / min under a nitrogen atmosphere and held at that temperature for 5 minutes. The sample was then cooled to 23°C at a heating rate of 20°C / min, held at that temperature for 5 minutes, and then heated to 200°C at a heating rate of 23°C / min. The endothermic peak observed during this second heating was taken as the melting peak, and the temperature at which this melting peak appeared was determined as the melting point (Tm). The heat of fusion ΔH was calculated by calculating the area of ​​the melting peak. If the melting peak is multimodal, the area of ​​the entire melting peak was calculated. The degree of crystallinity is determined by dividing the heat of fusion ΔH by 209 J / g, which is the heat of fusion of perfectly crystalline polypropylene.

[0015] (1.1.3) Haze of Resin Component A There are no particular limitations on the haze value of resin component A. From the viewpoint of enhancing the transparency of skin 3, the haze value of resin component A is preferably greater than 0% and not greater than 40%, more preferably greater than 0% and not greater than 30%, and even more preferably greater than 0% and not greater than 25%. The haze value of resin component A is measured in accordance with JIS K 7136 using a test piece (100 mm × 100 mm × 1 mm thick) made from resin component A with a haze meter (for example, Haze Meter HZ-2 type manufactured by Suga Test Instruments Co., Ltd.).

[0016] (1.1.4) Gloss of Resin Component A There are no particular limitations on the gloss of resin component A. From the viewpoint of enhancing the glossiness of skin 3, the gloss of resin component A is preferably 80% or more and less than 100%, more preferably 85% or more and less than 100%, and even more preferably 90% or more and less than 100%. The gloss of resin component A is measured as follows: In accordance with JIS Z 8741, a gloss meter (VG7000, Nippon Denshoku Industries Co., Ltd.) is used to measure the gloss of a test piece (100 mm x 100 mm x 1 mm thick) of resin component A at an incident angle of 60 degrees. The higher the gloss, the higher the surface gloss.

[0017] (1.2) Other components of the epidermis 3 The skin 3 may contain other ingredients such as weathering stabilizers, lubricants, antioxidants, and the like. The weathering stabilizer captures radicals generated by excitation with light energy, thereby suppressing a chain reaction of degradation. The weathering stabilizer is added, for example, as a masterbatch. The concentration of the active ingredient in the masterbatch is not particularly limited. The concentration of the active ingredient is usually 5% by mass or more and 30% by mass. The blending amount of the weathering stabilizer masterbatch is usually 0.1 parts by mass or more and 3.0 parts by mass or less per 100 parts by mass of the total of the resin component A. As the lubricant, for example, unsaturated fatty acid amides such as oleic acid amide and erucic acid amide, saturated fatty acid amides such as behenic acid amide and stearic acid amide, metal soap lubricants such as magnesium stearate and calcium stearate, etc. By adding a lubricant, damage to the skin 3 can be prevented. It is preferable that the skin 3 does not contain a pigment. If the skin 3 does not contain a pigment, the skin 3 becomes transparent, allowing the base material portion 5 to be seen through the skin 3, improving the appearance of the vehicle molding 1.

[0018] (1.3) Thickness of skin 3 There is no particular limitation on the thickness of the skin 3. From the viewpoint of ensuring surface hardness, the thickness of the skin 3 is preferably 0.10 mm or more and 0.50 mm or less, more preferably 0.20 mm or more and 0.40 mm or less, and even more preferably 0.25 mm or more and 0.35 mm or less.

[0019] (2) Base material part 5 The configuration of the substrate 5 is not particularly limited. A preferred embodiment of the substrate 5 will be described below. The substrate 5 preferably contains a resin component B, a rubber component, an oil component, and a filler component. Resin component B preferably contains a random copolymer polypropylene. The ratio of the oil component to the rubber component (oil component / rubber component) is preferably 0.3 or more and less than 2.5. When the substrate 5 has these preferred compositions, the flexibility of the substrate 5 is maintained while oil bleeding is suppressed. Furthermore, when the substrate 5 has these preferred compositions, the skin 3 and the substrate 5 both contain random copolymer polypropylene, resulting in excellent adhesion between the skin 3 and the substrate 5 and less peeling between them. Furthermore, when the substrate 5 has these preferred compositions, the molding temperature ranges of the skin 3 and the substrate 5 are close, allowing the skin 3 and the substrate 5 to be manufactured in a single-stage co-extrusion molding process.

[0020] (2.1) Resin component B Resin component B preferably contains random copolymer polypropylene. Regarding "random copolymer polypropylene," the explanation in the section "(1.1.1) Random copolymer polypropylene (R-PP)" applies as is, and further description is omitted. When resin component B of the base material 5 contains random copolymer polypropylene, the skin 3 also contains random copolymer polypropylene, which increases the thermal adhesion between the base material 5 and the skin 3. Therefore, the vehicle molding 1 can be manufactured by "one-stage molding" using co-extrusion molding. However, in the case of a vehicle molding 1 in which a polar resin, ionomer, is used for the skin 3 and a non-polar resin is used for the base material 5, the thermal adhesion between the base material 5 and the skin 3 is poor and they tend to peel off, requiring two-stage molding, which reduces manufacturing efficiency. From the viewpoint of heat resistance and flexibility, the content of the random copolymer polypropylene is preferably 20 parts by mass or more and 50 parts by mass or less, more preferably 20 parts by mass or more and 40 parts by mass or less, and more preferably 20 parts by mass or more and 35 parts by mass or less, when the total of the resin component B, the rubber component, the oil component, and the filler component is 100 parts by mass. Resin component B may contain one or more members selected from the group consisting of homopolypropylene (H-PP) and block polypropylene (B-PP).

[0021] (2.2) Rubber component The rubber component is not particularly limited. From the viewpoint of high oil retention and suppressing oil bleeding from the base material 5, the rubber component preferably contains at least one selected from the group consisting of styrene-ethylene-butadiene-styrene rubber (SEBS), styrene-butadiene rubber (SBR), styrene-butadiene-styrene rubber (SBS), styrene-ethylene-propylene rubber (SEP), isoprene-butadiene rubber, styrene-isoprene-butadiene rubber, styrene-isoprene rubber, and ethylene-propylene-diene copolymer rubber (EPDM). In particular, from the viewpoint of oil retention, styrene-ethylene-butadiene-styrene rubber (SEBS) is a preferred rubber component. The content of the rubber component is not particularly limited. From the viewpoint of ensuring the flexibility of the vehicle molding 1, the content of the rubber component is preferably 10 parts by mass or more, more preferably 12 parts by mass or more, and even more preferably 15 parts by mass or more, where the total of the resin component B, the rubber component, the oil component, and the filler component is 100 parts by mass. On the other hand, from the viewpoint of ensuring the rigidity of the vehicle molding 1, the content of the rubber component is preferably 40 parts by mass or less, more preferably 35 parts by mass or less, and even more preferably 30 parts by mass or less. From these viewpoints, the content of the rubber component is preferably 10 parts by mass or more and 40 parts by mass or less, more preferably 12 parts by mass or more and 35 parts by mass or less, and even more preferably 15 parts by mass or more and 30 parts by mass or less. If a rubber component containing styrene is used, the base material 5 will be made of a styrene-based thermoplastic elastomer.

[0022] (2.3) Oil components The oil component is not particularly limited, but from the viewpoint of maintaining the flexibility of the base portion 5 and suppressing oil bleeding, the oil component preferably contains paraffin-based process oil. Commercially available paraffin-based process oils can be used, such as Diana Process Oils "PW-380," "PW-32," "PW-90," "PW-150," "PS-430," "PS-32," and "PS-90" manufactured by Idemitsu Kosan Co., Ltd. The amount of the oil component is not particularly limited. From the viewpoint of ensuring a sufficient amount of rubber component with good oil retention and suppressing oil bleeding, the ratio of the oil component to the rubber component (oil component / rubber component) is preferably 0.3 or more and less than 2.5, more preferably 0.5 or more and 2.0 or less, and even more preferably 0.8 or more and 1.5 or less. Note that this ratio is a mass ratio.

[0023] (2.4) Filler components (fillers) The filler component is not particularly limited. Examples of filler components include inorganic fillers such as talc, calcium carbonate (such as heavy calcium carbonate), magnesium carbonate, calcium hydroxide, magnesium hydroxide, aluminum hydroxide, silicic acid and its salts, clay, mica powder, bentonite, silica, alumina, aluminum silicate, acetylene black, furnace black, and aluminum powder; organic fillers such as cork; and other known fillers. These filler components may be used alone or in combination of two or more. Talc and calcium carbonate are preferably used. The filler component preferably contains talc and calcium carbonate from the viewpoints of shrinkage prevention and dimensional stability. From the viewpoint of shrinkage prevention and dimensional stability, the content of the filler component is preferably 10 parts by mass or more and 40 parts by mass or less, more preferably 15 parts by mass or more and 35 parts by mass or less, and more preferably 20 parts by mass or more and 30 parts by mass or less, where the total of the resin component B, the rubber component, the oil component, and the filler component is 100 parts by mass. When talc and calcium carbonate are used as filler components, from the viewpoint of shrinkage prevention and dimensional stability, the talc is preferably blended in an amount of 13 parts by mass or more and 23 parts by mass or less, and more preferably 16 parts by mass or more and 20 parts by mass or less, where the total amount of talc and calcium carbonate is 25 parts by mass.

[0024] (2.5) Other components of the base material 5 The substrate 5 may contain additives such as processing aids, weatherproofing agents, antioxidants, lubricants, and pigments. Examples of processing aids include acrylic lubricants, and examples of commercially available acrylic lubricants include an acrylic polymer external lubricant (trade name "Metablen L", manufactured by Mitsubishi Chemical Corporation). As the weatherproofing agent, for example, a NOR type hindered amine compound is preferably used. As a light stabilizer mainly composed of a NOR type hindered amine compound, for example, BASF's "TINUVIN XT855 FF" is preferably used, which is a mixture of a high molecular weight hindered amine light stabilizer and a sterically hindered hindered amine light stabilizer, and is a low basicity weatherproofing stabilizer system. Note that the NOR type hindered amine compound is a hindered amine compound in which the H of the imino group (>NH) of the piperidine ring is substituted with an alkoxyl group (-OR). Suitable examples of antioxidants include hindered phenol-based antioxidants and phosphite-based antioxidants. A suitable example of a hindered phenol-based antioxidant is ADK STAB AO-60 (manufactured by ADEKA CORPORATION). ADK STAB AO-60 contains tetrakis[methylene-3-(3',5'-di-t-butyl-4'-hydroxyphenyl)propionate]methane. A suitable example of a phosphite-based antioxidant is ADK STAB 2112 (manufactured by ADEKA CORPORATION). ADK STAB 2112 contains tris(2,4-di-tert-butylphenyl)phosphite. As the lubricant, for example, metal soaps such as magnesium stearate and calcium stearate, unsaturated fatty acid amides such as oleic acid amide and erucic acid amide, saturated fatty acid amides such as behenic acid amide and stearic acid amide, and the like are suitably used.

[0025] (2.6) Crystallinity of all components constituting the substrate part 5 There is no particular limitation on the crystallinity of all the components constituting the base material 5. All the components constituting the base material 5 include, for example, the resin component B, the rubber component, the oil component, the filler component, and any additives added as needed. The crystallinity of all the components contained is preferably 3% or more and 15% or less, more preferably 4% or more and 13% or less, and even more preferably 5% or more and 11% or less, from the viewpoint of suppressing oil bleeding even when the vehicle molding 1 expands when heated and contracts when cooled due to temperature fluctuations. The crystallinity is determined by DSC measurement. Specifically, the melting point (Tm) and the heat of fusion ΔH are measured by DSC under the following conditions: Using a differential scanning calorimeter (Hitachi High-Tech Science Corporation VG7000), approximately 3 mg of a sample containing all components constituting the substrate portion 5 was heated from 23°C to 200°C at a heating rate of 20°C / min under a nitrogen atmosphere and held at that temperature for 5 minutes. The sample was then cooled to 23°C at a heating rate of 20°C / min, held at that temperature for 5 minutes, and then heated to 200°C at a heating rate of 23°C / min. The endothermic peak observed during this second heating was taken as the melting peak, and the temperature at which the melting peak appeared was determined as the melting point (Tm). The heat of fusion ΔH was calculated by calculating the area of ​​the melting peak. If the melting peak is multimodal, the area of ​​the entire melting peak was calculated. The degree of crystallinity is determined by dividing the heat of fusion ΔH by 209 J / g, which is the heat of fusion of perfectly crystalline polypropylene. It is preferable that the base material 5 contains random copolymer polypropylene in resin component B, and that the crystallinity of all components constituting the base material 5 is 3% or more and 15% or less. In this case, the random copolymer polypropylene is less likely to crystallize, and the rubber component is also less likely to crystallize, making the base material 5 less likely to crystallize as a whole. Therefore, there are fewer crystalline parts that expand and contract due to temperature fluctuations, which suppresses oil seepage due to expansion and contraction of the crystalline parts and reduces oil bleeding. Reducing oil bleeding from the base material 5 makes it less likely for oil to bleed onto the skin 3, improving the appearance of the design surface, which is the surface of the skin 3. The design surface can maintain a high gloss and have a good appearance, for example.

[0026] 2. Manufacturing method of vehicle molding 1 There is no particular limitation on the method for manufacturing the vehicle molding 1. A preferred manufacturing method will be described below. (1) Preparation of material for substrate portion 5 A compound material for the base material 5 is prepared. Specifically, a rubber component and an oil component are blended in advance, and the oil component is absorbed into the rubber component. The rubber component with the oil component absorbed, a thermoplastic resin, a filler, additives, etc. are then melt-kneaded in a co-rotating twin-screw extruder to produce the base material. (2) Co-extrusion In the molding process, a first extruder is used to supply material for molding the skin 3 of the vehicle molding 1, a second extruder is used to supply material for molding the base material 5, a third extruder is used to supply material for molding the lip portion 13, and a core material unwinder is used to supply the core material 11, and the skin 3, base material 5, lip portion 13, and core material 11 are simultaneously molded by co-extrusion molding to be fused and integrated, and the core material 11 is inserted and embedded integrally. In this way, a long vehicle molding 1 (for example, a roof molding) made of a resin material is manufactured. [Example]

[0027] The present invention will be explained in more detail below with reference to examples.

[0028] 1. Epidermis (1) Preparation of epidermis Various skins were produced using the blending ratios (parts by mass) shown in Table 1. Details of the main raw materials in Table 1 are shown below.

[0029] [Table 1]

[0030] <Resin component A> Random copolymer polypropylene (abbreviated as "R-PP1" in the table): Novatec PP MG03TH manufactured by Japan Polypropylene Corporation MI(MFR)=30 Random copolymer polypropylene (abbreviated as "R-PP2" in the table): SunAllomer PS522M manufactured by SunAllomer Co., Ltd. MI(MFR)=5 Number average molecular weight Mn:54,000 Weight average molecular weight Mw:395.600 Z average molecular weight Mz:1,303,000 Mw / Mn: 7.3 Mz / Mw: 3.3 Homopolypropylene (abbreviated as "H-PP" in the table): Novatec PP PS201A manufactured by Japan Polypropylene Corporation Block polypropylene (abbreviated as "B-PP" in the table): Novatec PP BC6C manufactured by Japan Polypropylene Corporation Ionomer: Himilan 1652 manufactured by Mitsui Dow Polychemicals Co., Ltd. <Weather-resistant stabilizer> Weatherproofing agent MB: UVT-53 manufactured by Tokyo Ink Co., Ltd.

[0031] (2) Evaluation method (2.1) Melting point and crystallinity of resin component A The melting point and crystallinity of resin component A were measured by the method described in the column "(1.1.2) Crystallinity of resin component A." The melting point and crystallinity of resin component A are simply described as "melting point" and "crystallinity" in Table 1. (2.2) Haze of Resin Component A The haze of resin component A was measured by the method described in the column "(1.1.3) Haze of resin component A." In Table 1, the haze of resin component A is simply described as "Haze." (2.3) Gloss of Resin Component A The gloss of resin component A was measured by the method described in the column "(1.1.4) Gloss of resin component A." In Table 1, the gloss of resin component A is simply referred to as "gloss." (2.4) Chemical resistance Chemical resistance was evaluated in accordance with JIS K 7114 by immersing a test piece (60 x 60 x 2 mm thick) in a test solution at 23±2°C for 7 days and observing any changes in appearance. The test solutions used for the evaluation were hydrochloric acid (33%), sulfuric acid (95%), ammonia water (28%), caustic soda (50%), and ethanol. If there was no weight gain or loss, or any abnormal appearance such as swelling or deformation, when immersed in any of the test solutions, the chemical resistance was judged to be "existent." Rating A: Chemical resistant. Rating B: No chemical resistance. (2.5) Overall rating The overall evaluation was as follows: If all three of the following criteria were met, the overall rating was "A." Otherwise (if at least one of the criteria was not met), the overall rating was "B." Rating 1: The melting point of resin component A is 140°C or higher. Rating 2: Haze value is greater than 0 and 40 or less. Rating 3: Gloss value is 80 or more and 100 or less.

[0032] (3) Results The results are also shown in Table 1. The skin of Example 1-6, which contained 50 to 100 parts by mass of random copolymer polypropylene out of a total of 100 parts by mass of resin component A, had a high melting point and good transparency and gloss. Therefore, the vehicle molding having the skin of Example 1-6 has high heat resistance and good decorativeness.

[0033] 2.Base material part (1) Preparation of the substrate Various base materials were prepared using the blending ratios (parts by mass) shown in Table 2. In Table 2, the details of the main raw materials are shown below.

[0034] [Table 2]

[0035] <Resin component B> Random copolymer polypropylene (abbreviated as "R-PP1" in the table): Novatec PP MG03TH manufactured by Japan Polypropylene Corporation MI(MFR)=30 Random copolymer polypropylene (abbreviated as "R-PP2" in the table): "SunAllomer PS522M" manufactured by SunAllomer Co., Ltd. MI(MFR)=5 Number average molecular weight Mn:54,000 Weight average molecular weight Mw:395.600 Z average molecular weight Mz:1,303,000 Mw / Mn: 7.3 Mz / Mw: 3.3 Homopolypropylene (abbreviated as "H-PP" in the table): "Novatec PP PS201A" manufactured by Japan Polypropylene Corporation Block polypropylene (abbreviated as "B-PP" in the table): "Novatec PP BC6C" manufactured by Japan Polypropylene Corporation <Rubber> Styrene-based rubber (SEBS): Kraton Corporation's "G1651 H Polymer" <Oil> Paraffin-based process oil: Idemitsu Kosan Co., Ltd., Diana Process PW-380 <Filler> Talc: Hai Cheng Jing Hua Mineral Products, "SK7800" Calcium carbonate: "Super 4S" manufactured by Maruo Calcium Co., Ltd. The 25 parts by mass of filler in Table 2 means the total of 18 parts by mass of talc and 7 parts by mass of calcium carbonate. <Processing aids> Acrylic polymer external lubricant: "Metablen L" manufactured by Mitsubishi Chemical Corporation <Weather-resistant stabilizer> NOR-type hindered amine compound: BASF's "TINUVIN XT855 FF" <Antioxidants> Antioxidant 1: Hindered phenol antioxidant, ADEKA Corporation, ADK STAB AO-60 Antioxidant 2: Phosphite antioxidant (ADEKA Corporation, ADK STAB 2112) <Lubricant> Calcium stearate: SC-100 manufactured by Sakai Chemical Industry Co., Ltd. <Pigments> Pigment (black): Tokyo Ink Co., Ltd. PEX999018

[0036] (2) Evaluation method (2.1) Melting point (Tm) Using a differential scanning calorimeter (Hitachi High-Tech Science Corporation VG7000), approximately 3 mg of a sample containing all the components constituting the substrate was heated from 23°C to 200°C at a heating rate of 20°C / min under a nitrogen atmosphere and held at that temperature for 5 minutes. The sample was then cooled to 23°C at a heating rate of 20°C / min, held at that temperature for 5 minutes, and then heated to 200°C at a heating rate of 23°C / min. The endothermic peak observed during this second heating was taken as the melting peak, and the temperature at which this melting peak appeared was determined as the melting point (Tm).

[0037] (2.2) Crystallinity of polypropylene (PP) alone The crystallinity of the polypropylene alone was determined by DSC measurement. The polypropylene samples used for the measurements have the same composition as the polypropylenes used for the respective substrates listed in Table 2. Specifically, In Comparative Example 4, a sample containing 100% H-PP by mass was used. In Comparative Example 5, a sample containing 100% B-PP was used. In Example 7, a sample containing 100% by mass of R-PP2 was used. In Example 8, a sample containing 50% by mass of R-PP1 and 50% by mass of R-PP2 was used. In Example 9, a sample containing 100% by mass of R-PP1 was used. In Comparative Example 6, a sample containing 50% by mass of R-PP1 and 50% by mass of R-PP2 was used. In Example 10, a sample containing 50% by mass of R-PP1 and 50% by mass of R-PP2 was used. In Example 11, a sample containing 50% by mass of R-PP1 and 50% by mass of R-PP2 was used. In Example 12, a sample containing 50% by mass of R-PP1 and 50% by mass of R-PP2 was used. Example 13 is a sample containing 33.3 mass % H-PP and 66.6 mass % R-PP1. Using a differential scanning calorimeter (Hitachi High-Tech Science Corporation VG7000), approximately 3 mg of polypropylene sample was heated from 23°C to 200°C at a heating rate of 20°C / min under a nitrogen atmosphere and held at that temperature for 5 minutes. The sample was then cooled to 23°C at a heating rate of 20°C / min, held at that temperature for 5 minutes, and then heated to 200°C at a heating rate of 23°C / min. The endothermic peak observed during this second heating was taken as the melting peak, and the temperature at which this melting peak appeared was determined as the melting point (Tm). The heat of fusion ΔH was calculated by calculating the area of ​​the melting peak. When the melting peak was multimodal, the area of ​​the entire melting peak was calculated. The crystallinity was measured by dividing the heat of fusion ΔH by 209 J / g, which is the heat of fusion of perfectly crystalline polypropylene.

[0038] (2.3) Crystallinity of all components constituting the substrate The crystallinity of all components constituting the substrate is listed in Table 2 as "blend crystallinity." Using a differential scanning calorimeter (Hitachi High-Tech Science Corporation VG7000), approximately 3 mg of a sample containing all components constituting the substrate portion 5 was heated from 23°C to 200°C at a heating rate of 20°C / min under a nitrogen atmosphere and held at that temperature for 5 minutes. The sample was then cooled to 23°C at a heating rate of 20°C / min, held at that temperature for 5 minutes, and then heated to 200°C at a heating rate of 23°C / min. The endothermic peak observed during this second heating was taken as the melting peak, and the temperature at which the melting peak appeared was determined as the melting point (Tm). The heat of fusion ΔH was calculated by calculating the area of ​​the melting peak. When the melting peak was multimodal, the area of ​​the entire melting peak was calculated. The crystallinity was measured by dividing the heat of fusion ΔH by 209 J / g, which is the heat of fusion of perfectly crystalline polypropylene.

[0039] (2.4) Shore A hardness Shore A hardness was measured according to ASTM D-2240 using a Shore hardness tester (Durometer Type A).

[0040] (2.5) Bleeding test A constant temperature and humidity chamber (Isuzu Manufacturing Co., Ltd. TP-200) was used to evaluate the bleeding of substrate test pieces (100 mm x 100 mm x 2 mm thick). The test temperature and humidity conditions were set at high temperature (80°C, 15% RH), normal temperature (23°C, 15% RH), low temperature (-30°C, 15% RH), and normal temperature (23°C, 15% RH). The test time was set at high temperature (7.5 hours), normal temperature (0.5 hours), low temperature (15.5 hours), and normal temperature (0.5 hours). The bleeding test was performed by repeating the cycle of high temperature → normal temperature → low temperature → normal temperature 10 times. After the bleeding test, the samples were visually inspected before and after the test to check for bleeding and any abnormalities in appearance. The bleeding property was evaluated as follows. A: No bleeding and no abnormal appearance. B: Bleeding or abnormal appearance.

[0041] (2.6) Overall rating The overall evaluation was as follows: If both of the following two criteria are met, the overall rating is "A." Otherwise (if at least one criterion is not met), the overall rating is "B." Rating 1: Bleeding property is rated "A". Rating 2: Shore A hardness is 80 or more.

[0042] (3) Results The results are also shown in Table 2. The base material of Example 7-13, which contained random copolymer polypropylene as resin component B and had an oil component / rubber component ratio of 0.3 or more and less than 2.5, was given an overall rating of "A." The substrate parts of Comparative Examples 4 and 5, which did not contain random copolymer polypropylene as the resin component B, had poor bleeding properties and were also given an overall rating of "B." The base material of Comparative Example 6, in which the oil component / rubber component ratio was 2.5, had poor bleeding properties and was given an overall rating of "B."

[0043] 3. Making moldings for vehicles (1) Manufacturing of moldings for vehicles Vehicle moldings were produced using the combination of the skin (see Table 1) and base material (see Table 2) shown in Table 3. Specifically, the material for molding the skin was supplied to an extrusion mold using a first extruder, the material for molding the base material was supplied using a second extruder, the material for molding the lip portion was supplied using a third extruder, and the core material was supplied using a core material unwinder, and the vehicle molding was produced by co-extrusion molding.

[0044] [Table 3]

[0045] (2) Evaluation method (2.1) Formability The moldability was evaluated as follows. A: The vehicle molding was successfully produced by co-extrusion molding. B: It was difficult to produce a molding for a vehicle by co-extrusion molding. (2.2) Appearance The appearance was evaluated as follows: A: The surface was highly glossy and had excellent appearance. B: The surface had low gloss and poor appearance. (2.3) Transparency Transparency was assessed as follows: A: The surface was highly transparent, and the base material was clearly visible through the surface. B: The transparency of the surface was low, and the base material could not be clearly seen through the surface. (2.4) Gross In accordance with JIS Z 8741, the gloss of the surface (skin surface) was measured using a gloss meter (VG7000, Nippon Denshoku Industries Co., Ltd.) at an incident angle of 60 degrees. The gross ratings were as follows: A: Gross is 80% or more. B: Gloss is less than 80%. (2.5) Bleeding The bleeding test was carried out in the same manner as in "(2.5) Bleeding test" in "2. Base material part" above. The bleeding test was evaluated as follows. A: No bleeding and no abnormal appearance. B: Bleeding or abnormal appearance. (2.6) Overall rating The overall evaluation was as follows: If the moldability, appearance, transparency, gloss, and bleeding properties were all good, the overall evaluation was given an "A." Otherwise (if at least one evaluation was bad), the overall evaluation was given a "B."

[0046] (3) Results The results are shown in Table 3. The vehicle molding in which the skin of the example and the base material of the example were combined was given an overall rating of "A." The vehicle molding in which the skin of the example and the base material of the comparative example were combined was given an overall rating of "B."

[0047] 4. Effects of the Example According to the above-described embodiment, a molding for a vehicle having high decorativeness and good heat resistance can be provided. The vehicle molding of the example has high gloss and good appearance. Vehicle moldings make it difficult for oil to bleed out. Vehicle moldings can be manufactured by one-stage co-extrusion molding, rather than two-stage molding, which increases molding efficiency. The surface and the base material of the vehicle molding are well heat-sealed and do not easily peel off. The vehicle molding has excellent chemical resistance and is therefore less likely to swell even when in contact with alcohol or the like for a long period of time.

[0048] The present disclosure is not limited to the above-described embodiments, and various modifications and variations are possible. [Explanation of symbols]

[0049] 1...vehicle molding 3...epidermis 5...Base material part 7...Umbrella part 9...Columnar part 11...Core material 13... Lip 13A...tip 15...Roof 17...Groove

Claims

1. A molding for a vehicle having a skin, The skin contains 50 parts by mass or more and 100 parts by mass or less of random copolymer polypropylene out of a total of 100 parts by mass of resin component A.

2. 2. The vehicle molding according to claim 1, wherein the resin component A has a crystallinity of 5% or more and 45% or less.

3. The vehicle molding according to claim 1 or 2, further comprising a base material portion superimposed on the skin.

4. the substrate portion contains a resin component B, a rubber component, an oil component, and a filler component, The resin component B contains a random copolymer polypropylene, 4. The molding for a vehicle according to claim 3, wherein a ratio of the oil component to the rubber component (the oil component / the rubber component) is equal to or greater than 0.3 and less than 2.

5.

5. When the total amount of the resin component B, the rubber component, the oil component, and the filler component is 100 parts by mass, The vehicle molding according to claim 4, wherein the base material contains 20 parts by mass or more and 50 parts by mass or less of random copolymer polypropylene as the resin component B.

6. When the total amount of the resin component B, the rubber component, the oil component, and the filler component is 100 parts by mass, The vehicle molding according to claim 4 or 5, wherein the base material contains 10 parts by mass or more and 40 parts by mass or less of the rubber component.

7. The molding for a vehicle according to any one of claims 4 to 6, wherein the crystallinity of all components constituting the base material is 3% or more and 15% or less.

8. A vehicle molding including a base material, the base material containing a resin component B, a rubber component, an oil component, and a filler component, The resin component B contains a random copolymer polypropylene, A molding for a vehicle, wherein a ratio of the oil component to the rubber component (the oil component / the rubber component) is equal to or greater than 0.3 and less than 2.5.

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