Vehicle 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 vehicle molding.

Background Art

[0002] Vehicle moldings are attached to vehicles for purposes such as decoration (see, for example, Patent Document 1). Vehicle moldings are used, for example, by fitting them into grooves provided in the roof of a vehicle body. Since vehicles are heated by sunlight, vehicle moldings are also required to have heat resistance. For the purpose of improving decorativeness, ionomer may be used as the material of the vehicle molding.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when ionomer is used, the heat resistance of the vehicle molding is not always sufficient, and improvement in heat resistance has been desired. The present disclosure has been made in view of the above circumstances, and an object thereof is to provide a vehicle molding having high decorativeness and good heat resistance. The present disclosure can be realized in the following forms.

Means for Solving the Problems

[0005] 〔1〕A vehicle molding including a skin, wherein 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 a resin component A.

Effects of the Invention

[0006] The vehicle moldings disclosed herein are highly decorative and highly heat-resistant. [Brief explanation of the drawing]

[0007] [Figure 1] This is a cross-sectional view showing an example of a vehicle molding. [Figure 2] This is a cross-sectional view showing an example of a vehicle molding in an installed state. [Modes for carrying out the invention]

[0008] Herein lies a preferred example of this disclosure. [2] A vehicle molding in which the degree of crystallinity of the resin component A is 5% or more and 45% or less. [3] A vehicle molding comprising a base material portion superimposed on the surface material. [4] The base material contains resin component B, rubber component, oil component, and filler component, The aforementioned resin component B includes random copolymer polypropylene, A vehicle molding in which the ratio of the oil component to the rubber component (oil component / rubber component) is 0.3 or more 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 portion contains 20 to 50 parts by mass of random copolymer polypropylene as resin component B, and is a molding for vehicles. [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 portion contains 10 to 40 parts by mass of the rubber component, and is a molding for vehicles. [7] A vehicle molding in which the crystallinity of all components constituting the base material is 3% or more and 15% or less. [8] A vehicle molding comprising a base material, wherein the base material contains resin component B, rubber component, oil component, and filler component, The aforementioned resin component B includes random copolymer polypropylene, A vehicle molding in which the ratio of the oil component to the rubber component (oil component / rubber component) is 0.3 or more and less than 2.5.

[0009] The following provides a detailed explanation of this disclosure. In this specification, when numerical ranges are described using "~", unless otherwise specified, both the lower limit and the upper limit are included. For example, the description "10~20" includes both the lower limit "10" and the upper limit "20". In other words, "10~20" has the same meaning as "10 or more and 20 or less".

[0010] 1. Vehicle molding 1 The vehicle molding 1 comprises a surface layer 3. The surface layer 3 contains 50 to 100 parts by mass of random copolymer polypropylene out of a total of 100 parts by mass of resin component A. An example configuration of the vehicle molding 1 will be described in detail. The vehicle molding 1 is in the shape of a strip. Preferably, the vehicle molding 1 comprises a surface layer 3 and a base material 5 superimposed on the back side of the surface layer 3, as shown in Figure 1. The cross-section of the base material 5 is, for example, shaped to include an umbrella portion 7 and a columnar portion 9 protruding from the lower surface of the umbrella portion 7. The base material 5 is the main body of the vehicle molding 1. The base material 5 contains a strip-shaped metal core material 11 made of iron, stainless steel, or the like. The surface layer 3 is arranged on the surface of the umbrella portion 7. A pair of elastically deformable lip portions 13, 13 protrude from both sides of the lower end of the base material 5.

[0011] As shown in Figure 2, the vehicle molding 1 is attached to a groove 17 provided on the roof 15 of the vehicle body. Specifically, the columnar portion 9 and the lip portion 13 are fitted into the groove 17. The umbrella portion 7 is positioned on the surface of the vehicle body, blocking 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. When the lip portion 13 inserted into the groove 17 elastically returns to its original shape, the lip portions 13, 13 press against the side walls inside the groove 17, fixing the vehicle molding 1 to the groove 17.

[0012] (1) Epidermis 3 (1.1) Resin component A As described above, the skin layer 3 contains random copolymer polypropylene (hereinafter also referred to as "R-PP") in the resin component A. By containing random copolymer polypropylene, the crystallinity of the skin layer 3 can be lowered and the transparency can be improved. By improving the transparency, the design surface can be made beautiful in the same manner as when an ionomer is used. In addition, since the skin layer 3 contains random copolymer polypropylene, flexibility is imparted. In addition, since the skin layer 3 contains random copolymer polypropylene, for example, when the skin layer 3 is manufactured by extrusion molding, shrinkage deformation after extrusion molding is also suppressed. In addition, since the skin layer 3 contains random copolymer polypropylene, it has excellent chemical resistance. When the skin layer 3 contains an ionomer, its chemical resistance is poor. In addition, since the skin layer 3 contains random copolymer polypropylene, for example, its surface hardness is higher than that of olefin-based elastomer (TPO) and styrene block copolymer (TPS), and it is less likely to be scratched. In addition, since the skin layer 3 contains random copolymer polypropylene having a high melting point, it is less likely to deform than when it contains an ionomer having a low melting point. From the viewpoint of enhancing the decorativeness and improving the heat resistance, the content of 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 with respect to 100 parts by mass in total of the resin component A. The resin component A may contain one or more selected from the group consisting of homopolypropylene (hereinafter also referred to as "H-PP") and block polypropylene (hereinafter also referred to as "B-PP"). Note that, from the viewpoint of improving the smoothness of the surface of the skin layer 3 and improving the gloss value (achieving a high gloss), the content of the rubber component is preferably 10 parts by mass or less, more preferably 5 parts by mass or less, and still more preferably 1 part by mass or less with respect to 100 parts by mass in total of the resin component A. It is preferable that the resin component A does not contain a rubber component (such as styrene rubber), that is, it is 0 parts by mass.

[0013] (1.1.1) Random copolymer polypropylene (R-PP) As the random copolymer polypropylene, for example, a random copolymer using ethylene and / or butene-1 in addition to propylene as the monomers to be polymerized is preferably exemplified. It may be a random copolymer of propylene and ethylene obtained by copolymerizing propylene and ethylene, or a random copolymer of propylene and butene-1 obtained by copolymerizing propylene and butene-1, or a random copolymer of propylene, ethylene and butene-1 obtained by copolymerizing propylene with ethylene and butene-1. A random copolymer of propylene and ethylene is preferred. The melt flow rate (JIS K7210 Method A, condition M, 230 °C, 2.16 kg) of the random copolymer polypropylene is not particularly limited. From the viewpoint of extrusion moldability, the melt flow rate is preferably 2 g / 10 min or more and 50 g / 10 min or less, more preferably 4 g / 10 min or more and 40 g / 10 min or less, and still more preferably 5 g / 10 min or more and 30 g / 10 min or less. The random copolymer polypropylene 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 can be 0.89 g / cm 3 or more and 0.92 g / cm 3 or less. The density is measured in accordance with JIS K7112.

[0014] (1.1.2) Crystallinity of resin component A The crystallinity of resin component A is not particularly limited. From the viewpoint of enhancing the transparency of the 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 still more preferably 15% or more and 35% or less. The crystallinity is determined by DSC measurement. Specifically, the measurement of the melting point (Tm) and the heat of fusion ΔH is determined by performing DSC measurement under the following conditions. Using a differential scanning calorimeter (Hitachi High-Tech Science Corporation VG7000), a sample of resin component A (approximately 3 mg) is 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. It is then cooled to 23°C at a cooling rate of 20°C / min, held at that temperature for 5 minutes, and then heated again to 200°C at a heating rate of 23°C / min. The endothermic peak observed during this second heating is defined as the melting peak, and the temperature at which this melting peak appears is determined as the melting point (Tm). The heat of fusion ΔH is calculated by determining the area of ​​the melting peak. If the melting peak is multi-peaked, the area of ​​the entire melting peak is calculated. The degree of crystallinity is determined by dividing the heat of fusion ΔH by the heat of fusion of polypropylene perfect crystals, which is 209 J / g.

[0015] (1.1.3) Haze of resin component A The haze value of resin component A is not particularly limited. From the viewpoint of increasing the transparency of the surface 3, the haze value of resin component A is preferably greater than 0% and 40% or less, more preferably greater than 0% and 30% or less, and even more preferably greater than 0% and 25% or less. The haze value of resin component A is measured using a haze meter (for example, Suga Test Instruments Co., Ltd., HZ-2 type) with a test specimen (100 mm × 100 mm × t1 mm) made of resin component A, in accordance with JIS K 7136.

[0016] (1.1.4) Gloss of resin component A The gloss of resin component A is not particularly limited. From the viewpoint of enhancing the glossiness of the surface 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 (Nippon Denshoku Industries Co., Ltd. VG7000) is used to measure the gloss of a test piece (100mm x 100mm x t1mm) 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 Epidermis 3 The epidermis 3 may contain other components such as weather stabilizers, lubricants, and antioxidants. Weather stabilizers suppress degradation chain reactions by capturing radicals excited and generated by light energy. Weather stabilizers are 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 amount of weather stabilizer masterbatch added 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 resin component A. Examples of lubricants used include unsaturated fatty acid amides such as oleamide and erucamide, saturated fatty acid amides such as behenamide and stearamide, and metal soap-based lubricants such as magnesium stearate and calcium stearate. By incorporating a lubricant, damage to the epidermis 3 is suppressed. Furthermore, it is preferable that the surface layer 3 does not contain pigment. If the surface layer 3 does not contain pigment, the surface layer 3 becomes transparent, and the base material 5 becomes visible through the surface layer 3, improving the appearance of the vehicle molding 1.

[0018] (1.3) Thickness of the epidermis 3 The thickness of the surface layer 3 is not particularly limited. From the viewpoint of ensuring surface hardness, the thickness of the surface layer 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 composition of the base material 5 is not particularly limited. Preferred embodiments of the base material 5 are described below. The base material 5 preferably contains a resin component B, a rubber component, an oil component, and a filler component. It is preferable that the resin component B contains 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 base material 5 has these preferred compositions, the flexibility of the base material 5 is maintained while oil bleeding is suppressed. Furthermore, when the base material 5 has these preferred compositions, the adhesion between the skin 3 and the base material 5 is excellent because the skin 3 and the base material 5 both contain random copolymer polypropylene, making them less prone to peeling. In addition, when the base material 5 has these preferred compositions, the molding temperature ranges of the skin 3 and the base material 5 become close, and the skin 3 and the base material 5 can be manufactured in a single stage by co-extrusion molding.

[0020] (2.1) Resin component B Resin component B preferably contains random copolymer polypropylene. The explanation for "random copolymer polypropylene" in the section "(1.1.1) Random Copolymer Polypropylene (R-PP)" applies as is, and that description is omitted. If the resin component B of the base material 5 contains random copolymer polypropylene, the surface layer 3 also contains random copolymer polypropylene, thus improving the heat-sealing properties between the base material 5 and the surface layer 3. Therefore, the vehicle molding 1 can be manufactured in a "single-stage molding" process by co-extrusion. However, in the case of a vehicle molding 1 in which a polar resin ionomer is used for the surface layer 3 and a non-polar resin is used for the base material 5, the heat-sealing properties between the base material 5 and the surface layer 3 are poor, making them prone to peeling, requiring two-stage molding, which results in poor manufacturing efficiency. From the viewpoint of heat resistance and flexibility, the content of random copolymer polypropylene is preferably 20 to 50 parts by mass, preferably 20 to 40 parts by mass, and more preferably 20 to 35 parts by mass, when the total of resin component B, rubber component, oil component, and filler component is 100 parts by mass. Resin component B may contain one or more materials selected from the group consisting of homopolypropylene (H-PP) and block polypropylene (B-PP).

[0021] (2.2) Rubber components The rubber component is not particularly limited. From the viewpoint of high oil retention and suppression of 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. When the total of resin component B, rubber component, oil component, and filler component is 100 parts by mass, 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, from the viewpoint of ensuring the flexibility of the vehicle molding 1. 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. Furthermore, if a rubber component containing styrene is used, the base material 5 will be composed of a styrene-based thermoplastic elastomer.

[0022] (2.3) Oil components The oil component is not particularly limited. From the viewpoint of maintaining the flexibility of the base material 5 while suppressing oil bleeding, it is preferable that the oil component contains a paraffin-based process oil. Commercially available paraffin-based process oils can be used. Examples of commercially available products include Idemitsu Kosan's Diana Process Oils "PW-380", "PW-32", "PW-90", "PW-150", "PS-430", "PS-32", and "PS-90". The amount of oil component is not particularly limited. The ratio of oil component to 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, from the viewpoint of ensuring sufficient rubber component with good oil retention and suppressing oil bleeding. 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 (heavy calcium carbonate, etc.), 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. Preferably, talc and calcium carbonate are used. From the viewpoint of preventing shrinkage and maintaining dimensional stability, it is preferable that the filler component contains talc and calcium carbonate. From the viewpoint of preventing shrinkage and maintaining dimensional stability, the content of the filler component is preferably 10 to 40 parts by mass, preferably 15 to 35 parts by mass, and more preferably 20 to 30 parts by mass, when the total of resin component B, rubber component, oil component, and filler component is 100 parts by mass. When talc and calcium carbonate are used as filler components, from the viewpoint of preventing shrinkage and maintaining dimensional stability, it is preferable that the talc is blended in a proportion of 13 to 23 parts by mass, and more preferably 16 to 20 parts by mass, when the total amount of talc and calcium carbonate is 25 parts by mass.

[0024] (2.5) Other components of the base material 5 The base material 5 may contain additives such as processing aids, weathering agents, antioxidants, lubricants, and pigments. Examples of processing aids include acrylic lubricants. Examples of commercially available acrylic lubricants include acrylic polymer external lubricants (product name "Metablen L", manufactured by Mitsubishi Chemical Corporation). As a weathering agent, for example, NOR-type hindered amine compounds are preferably used. A light stabilizer mainly composed of NOR-type hindered amine compounds is, for example, a mixture of a high molecular weight hindered amine light stabilizer and a sterically hindered hindered amine light stabilizer, and BASF's "TINUVIN XT855 FF," which is a low-basic weathering stabilizer system, can be preferably used. A 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). As antioxidants, for example, hindered phenol antioxidants and phosphite antioxidants are preferably used. As a hindered phenol antioxidant, Adekastab AO-60 (manufactured by ADEKA Corporation) is preferably exemplified. Adekastab AO-60 contains tetrakis[methylene-3-(3',5'-di-t-butyl-4'-hydroxyphenyl)propionate]methane. As a phosphite antioxidant, Adekastab 2112 (manufactured by ADEKA Corporation) is preferably exemplified. Adekastab 2112 contains tris(2,4-di-tert-butylphenyl)phosphite. Suitable lubricants include, for example, metal soaps such as magnesium stearate and calcium stearate, unsaturated fatty acid amides such as oleamide and erucamide, and saturated fatty acid amides such as behenamide and stearamide.

[0025] (2.6) Degree of crystallinity of all components constituting the base material 5 The degree of crystallinity of all components constituting the base material 5 is not particularly limited. All components constituting the base material 5 include, for example, resin component B, rubber component, oil component, filler component, and additives added as needed. From the viewpoint of suppressing oil bleeding even when the vehicle molding 1 is heated and expands due to temperature fluctuations and cooled and contracts, the crystallinity of the components is preferably 3% to 15%, more preferably 4% to 13%, and even more preferably 5% to 11%. The degree of crystallinity is determined by DSC measurement. Specifically, the melting point (Tm) and the heat of fusion ΔH are determined by DSC measurement under the following conditions. Using a differential scanning calorimeter (Hitachi High-Tech Science Corporation, VG7000), a sample containing all the components of the base material 5, approximately 3 mg in size, is 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. It is then cooled to 23°C at a cooling rate of 20°C / min, held at that temperature for 5 minutes, and then heated again to 200°C at a heating rate of 23°C / min. The endothermic peak observed during this second heating is defined as the melting peak, and the temperature at which this melting peak appears is determined as the melting point (Tm). The heat of fusion ΔH is calculated by determining the area of ​​the melting peak. If the melting peak is multi-peaked, the area of ​​the entire melting peak is calculated. The degree of crystallinity is determined by dividing the heat of fusion ΔH by the heat of fusion of polypropylene perfect crystals, which is 209 J / g. Preferably, the base material 5 contains random copolymer polypropylene in the resin component B, and the crystallinity of all components constituting the base material 5 is 3% to 15%. In this case, the random copolymer polypropylene is less likely to crystallize, the rubber component is also less likely to crystallize, and the entire base material 5 is less likely to crystallize. Therefore, the amount of crystalline material that expands and contracts with temperature fluctuations is reduced, which suppresses oil seepage due to the expansion and contraction of the crystalline material, resulting in less oil bleeding. When oil bleeding from the base material 5 is reduced, oil is less likely to bleed onto the surface 3, and the appearance of the design surface, which is the surface of the surface 3, becomes better. The design surface can, for example, maintain high gloss and have a good appearance.

[0026] 2. Manufacturing method of vehicle molding 1 The method for manufacturing the vehicle molding 1 is not particularly limited. A preferred manufacturing method is described below. (1) Preparation of the material for the base material 5 The compound material for the base material 5 is prepared. Specifically, rubber components and oil components are blended in advance, and the oil components are absorbed into the rubber components. Then, the rubber components that have absorbed the oil components, thermoplastic resin, fillers, additives, etc. are melt-kneaded together in a co-directional twin-screw extruder to produce the material for the base material. (2) Co-extrusion In the molding process, a material for forming the outer layer 3 of the vehicle molding 1 is supplied to the extrusion mold using a first extrusion molding machine, a material for forming the base material 5 is supplied using a second extrusion molding machine, a material for forming the lip portion 13 is supplied using a third extrusion molding machine, and a core material 11 is supplied using a core material unwinding machine. The outer layer 3, base material 5, lip portion 13, and core material 11 are simultaneously molded and fused together by co-extrusion molding, and the core material 11 is inserted and embedded integrally. This produces a long vehicle molding 1 (for example, a roof molding) made of resin material. [Examples]

[0027] The following will provide a more detailed explanation using examples.

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

[0029] [Table 1]

[0030] <Resin component A> • Random copolymer polypropylene (abbreviated as "R-PP1" in the table): Novatec PP MG03TH, manufactured by Nippon Polypropylene Co., Ltd. MI(MFR)=30 • Random copolymer polypropylene (abbreviated as "R-PP2" in the table): Manufactured by Sun Allomer Co., Ltd. Sun Allomer PS522M 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 Nippon Polypropylene Co., Ltd. • Block polypropylene (abbreviated as "B-PP" in the table): Novatec PP BC6C, manufactured by Nippon Polypropylene Co., Ltd. • Ionomer: Hymiran 1652, manufactured by Mitsui Dow Polychemical Co., Ltd. <Weather stabilizer> • Weather-resistant agent MB: UVT-53 manufactured by Tokyo Ink Co., Ltd.

[0031] (2) Evaluation method (2.1) Melting point and degree of crystallinity of resin component A The melting point and crystallinity of resin component A were measured using the method described in the section "(1.1.2) Crystallinity of Resin Component A". In Table 1, the melting point and crystallinity of resin component A are simply referred to as "Melting Point" and "Crystallization," respectively. (2.2) Haze of resin component A The haze of resin component A was measured using the method described in the section "(1.1.3) Haze of resin component A". In Table 1, the haze of resin component A is simply referred to as "Haze". (2.3) Gloss of resin component A The gloss of resin component A was measured using the method described in the section "(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 according to JIS K 7114 by immersing a test specimen (60 × 60 × t2 mm) in a test solution at 23 ± 2 °C for 7 days and observing the change in appearance. The test solutions used for evaluation were hydrochloric acid (33%), sulfuric acid (95%), aqueous ammonia (28%), caustic soda (50%), and ethanol. If no changes in weight, swelling, deformation, or other external abnormalities occurred when immersed in any of the test solutions, the chemical resistance was judged to be "good". Rating A: Chemical resistant. Rating B: No chemical resistance. (2.5) Overall rating The overall evaluation was as follows: A rating of "A" was given if all three of the following criteria were met. A rating of "B" was given in all other cases (if at least one criterion was not met). Evaluation 1: The melting point of resin component A is 140°C or higher. Evaluation 2: The haze value is greater than 0 and 40 or less. Rating 3: The gross value is between 80 and 100.

[0032] (3) Results The results are shown in Table 1. In Examples 1-6, the surface of resin component A contained 50 to 100 parts by mass of random copolymer polypropylene out of a total of 100 parts by mass, and exhibited a high melting point, good transparency, and good gloss. Therefore, the vehicle moldings having the surface of Examples 1-6 have high heat resistance and good decorative properties.

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

[0034] [Table 2]

[0035] <Resin component B> • Random copolymer polypropylene (abbreviated as "R-PP1" in the table): Novatec PP MG03TH, manufactured by Nippon Polypropylene Co., Ltd. MI(MFR)=30 • Random copolymer polypropylene (abbreviated as "R-PP2" in the table): Manufactured by Sun Allomer Co., Ltd. "Sun Allomer PS522M" 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 Nippon Polypropylene Co., Ltd. • Block polypropylene (abbreviated as "B-PP" in the table): "Novatec PP BC6C" manufactured by Nippon Polypropylene Co., Ltd. <rubber> Styrene rubber (SEBS): Kraton Corporation "G1651 H Polymer" <oil> Paraffin-based process oil: Diana Process PW-380, manufactured by Idemitsu Kosan Co., Ltd. <Filler> • Talc: Manufactured by Hai Cheng Jing Hua Mineral Products, "SK7800" • Calcium carbonate: "Super 4S" manufactured by Maruo Calcium Co., Ltd. • In Table 2, 25 parts by mass of filler refers to the sum 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 stabilizer> NOR-type hindered amine compound: BASF, "TINUVIN XT855 FF" <Antioxidant> • Antioxidant 1: Hindered phenol antioxidant (ADEKA Corporation, ADEKA Stab AO-60) • Antioxidant 2: Phosphate-based antioxidant (ADEKA Corporation, ADEKA 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), a sample containing all the components of the base material, approximately 3 mg in size, 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. It was then cooled to 23°C at a cooling rate of 20°C / min and held at that temperature for 5 minutes before being heated again to 200°C at a heating rate of 23°C / min. The endothermic peak observed during this second heating was identified 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) only The crystallinity of polypropylene alone was determined by DSC measurement. The polypropylene samples used for the measurements have the same composition as the polypropylene used for each substrate listed in Table 2. Specifically, Comparative Example 4 used a sample containing 100% by mass of H-PP. Comparative Example 5 used a sample containing 100% by mass of B-PP. In Example 7, a sample of 100% by mass of R-PP2 was used. In Example 8, the sample consisted of 50% by mass of R-PP1 and 50% by mass of R-PP2. In Example 9, a sample of 100% by mass of R-PP1 was used. Comparative Example 6 used a sample containing 50% by mass of R-PP1 and 50% by mass of R-PP2. In Example 10, the sample consisted of 50% by mass of R-PP1 and 50% by mass of R-PP2. In Example 11, the sample consisted of 50% by mass of R-PP1 and 50% by mass of R-PP2. In Example 12, the sample consisted of 50% by mass of R-PP1 and 50% by mass of R-PP2. Example 13 uses a sample with H-PP 33.3% by mass and R-PP1 66.6% by mass. 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. It was then cooled to 23°C at a cooling rate of 20°C / min and held at that temperature for 5 minutes before being heated again to 200°C at a heating rate of 23°C / min. The endothermic peak observed during this second heating was defined 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 determining the area of ​​the melting peak. In cases where the melting peak was multi-peaked, the area of ​​the entire melting peak was calculated. The degree of crystallinity was determined by dividing the heat of fusion ΔH by the heat of fusion of polypropylene perfect crystals, which is 209 J / g.

[0038] (2.3) Crystallinity of all components constituting the base material In Table 2, the degree of crystallinity of all components constituting the base material is indicated as "Blend Crystallinity". Using a differential scanning calorimeter (Hitachi High-Tech Science Corporation, VG7000), a sample containing all the components of the base material 5, approximately 3 mg in size, 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. It was then cooled to 23°C at a cooling rate of 20°C / min, held at that temperature for 5 minutes, and then heated again to 200°C at a heating rate of 23°C / min. The endothermic peak observed during this second heating was defined 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 determining the area of ​​the melting peak. If the melting peak was multi-peaked, the area of ​​the entire melting peak was calculated. The degree of crystallinity was determined by dividing the heat of fusion ΔH by the heat of fusion of polypropylene perfect crystals, which is 209 J / g.

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

[0040] (2.5) Bleed test A constant temperature and humidity chamber (Isuzu Manufacturing Co., Ltd. TP-200) was used to evaluate the bleed of test specimens (100mm x 100mm x t2mm) of the substrate. The test temperature and humidity conditions were set to high temperature (80°C, 15%RH), room temperature (23°C, 15%RH), low temperature (-30°C, 15%RH), and room temperature (23°C, 15%RH). The test time was set to high temperature (7.5hr), room temperature (0.5hr), low temperature (15.5hr), and room temperature (0.5hr). The bleed test was performed by repeating the cycle of high temperature → room temperature → low temperature → room temperature 10 times. After the bleed test, the samples before and after the test were visually observed to check for the presence or absence of bleed and appearance abnormalities. The breeding potential was evaluated as follows: A: There is no bleeding and no external abnormalities. B: There is bleeding or an abnormal appearance.

[0041] (2.6) Overall rating The overall evaluation was as follows: If both of the following evaluation criteria were met, the overall evaluation was "A". In all other cases (if at least one of the criteria was not met), the overall evaluation was "B". Evaluation 1: Breeding ability is rated as "A". Rating 2: Shore A hardness is 80 or higher.

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

[0043] 3. Fabrication of vehicle moldings (1) Fabrication of vehicle moldings Vehicle moldings were manufactured using a combination of the outer layer (see Table 1) and base material (see Table 2) shown in Table 3. Specifically, the material for forming the outer layer was supplied to the extrusion mold using a first extrusion molding machine, the material for forming the base material was supplied using a second extrusion molding machine, the material for forming the lip portion was supplied using a third extrusion molding machine, and the core material was supplied using a core material unwinding machine, thereby manufacturing the vehicle moldings by co-extrusion molding.

[0044] [Table 3]

[0045] (2) Evaluation method (2.1) Formability The moldability was evaluated as follows: A: We were able to successfully manufacture vehicle moldings using co-extrusion molding. B: It was difficult to manufacture the vehicle moldings by co-extrusion molding. (2.2) Appearance The external appearance was evaluated as follows: A: The surface had a high gloss and was aesthetically pleasing. B: The surface had low gloss and poor aesthetics. (2.3) Transparency The transparency assessment was conducted as follows: A: The surface layer had high transparency, and the base material was clearly visible through the surface layer. B: The transparency of the surface layer was low, and the base material could not be clearly seen through the surface layer. (2.4) Gross In accordance with JIS Z 8741, the gloss of the surface (surface of the skin) was measured using a gloss meter (VG7000, Nippon Denshoku Industries Co., Ltd.) with an incident angle of 60 degrees. Gross's evaluation was as follows: A: The gross percentage is 80% or more. B: The gross percentage is less than 80%. (2.5) Bleeding properties The procedure was carried out in the same manner as described in "(2.5) Bleed Test" of "2. Substrate Part" above. The bleedability was evaluated as follows. A: There is no bleeding and no external abnormalities. B: There is bleeding or an abnormal appearance. (2.6) Overall rating The overall evaluation was as follows: A product was given an overall rating of "A" if it received good evaluations for moldability, appearance, transparency, gloss, and bleed resistance. In all other cases (if at least one evaluation was poor), it received an overall rating of "B".

[0046] (3) Results The results are shown in Table 3. The vehicle molding with the skin of the example and the base material of the example received an overall evaluation of "A". The vehicle molding with the skin of the example and the base material of the comparative example received an overall evaluation of "B".

[0047] 4. Effects of the Examples According to the above embodiments, it is possible to provide vehicle moldings that are highly decorative and have good heat resistance. The vehicle molding in this embodiment has a high gloss and a good appearance. Vehicle moldings are less prone to oil bleeding out. Vehicle moldings can be manufactured using a single-stage molding process called co-extrusion, rather than a two-stage molding process. Therefore, the molding efficiency of vehicle moldings is high. Vehicle moldings have good heat-sealing properties between the surface and the base material, making them resistant to peeling. Vehicle moldings have excellent chemical resistance, so they are less likely to swell even when in contact with alcohol or other substances for extended periods.

[0048] This disclosure is not limited to the embodiments detailed above, and various modifications or alterations 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 part 13A...Tip 15...Roof 17...Groove

Claims

1. A vehicle molding comprising a base material and a surface material, The base material contains resin component B, rubber component, oil component, and filler component. The aforementioned resin component B includes random copolymer polypropylene, The ratio of the oil component to the rubber component (oil component / rubber component) is 0.8 or more and 2.0 or less. The cross-section of the base material has a shape comprising an umbrella portion and a columnar portion protruding from the lower surface of the umbrella portion. The surface of the umbrella portion is covered with the skin, A vehicle molding having a pair of elastically deformable lip portions protruding from both sides of the lower end of the base material.

2. 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 1, wherein the base material portion contains 20 to 50 parts by mass of random copolymer polypropylene as the resin component B.

3. 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 1 or claim 2, wherein the base material portion contains 10 to 40 parts by mass of the rubber component.

4. The vehicle molding according to any one of claims 1 to 3, wherein the degree of crystallinity of the contents of all components constituting the base material is 3% or more and 15% or less.

5. The aforementioned surface contains 50 to 100 parts by mass of random copolymer polypropylene out of a total of 100 parts by mass of resin component A. The vehicle molding according to any one of claims 1 to 4, wherein the melt flow rate of the random copolymer polypropylene is 2 g / 10 min or more and 30 g / 10 min or less.

6. The vehicle molding according to claim 5, which is a roof molding.

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