Weatherstrip

Abstract

To provide a weatherstrip that maintains noise prevention properties and ensures watertightness even when fillers are present in the coating film formed on the surface. [Solution] A weatherstrip 200 comprising a mounting base 10 attached to the periphery of a vehicle opening / closing body 1 or the periphery of an opening in the body 2, and a sealing portion 20 integrally molded with the mounting base 10 and elastically contacting the periphery of the opening in the body 2 or the periphery of the opening / closing body 1 when the opening / closing body 1 is closed, wherein the sealing portion 20 has a coating film 50 formed on its surface in which filler 70 with a plurality of particle sizes added to the base 60, and the particle size of the filler 70 (70A) that protrudes the most from the base 60 is 15 to 20 μm, and its 10% deformation strength is 0.1 MPa or less.

Description

Technical Field

[0001] The present invention relates to a weatherstrip that is attached to the periphery of an opening and closing body such as a side door, back door, trunk lid, hood, etc. of an automobile or the periphery of an opening of a body, and elastically contacts the body side or the opening and closing body when the opening and closing body is closed to seal between the opening and closing body and the body.

Background Art

[0002] Conventionally, as shown in FIGS. 1 and 2, an attachment base 10 attached to the periphery of an opening and closing body 1 such as a door of a vehicle, and a hollow seal portion 20 integrally formed with the attachment base 10 and elastically contacting the peripheral edge of the opening on the body 2 side when the opening and closing body 1 is closed, and having a coating film 50 formed on the surface, a weatherstrip (door weatherstrip) 200 is known (for example, see Patent Document 1).

[0003] Also, it is known that fillers such as silicone particles and polyurethane gel particles are added to the coating film 50 of the weatherstrip for automobiles for the purpose of improving the noise prevention property (see Patent Documents 2 and 3). The noise here refers to the squeaking noise generated when the body and the weatherstrip slide due to vibrations during driving, etc., and it is particularly likely to occur in a so-called semi-wet state where the weatherstrip is slightly wet, such as on rainy days, and it is one of the factors that deteriorate the vehicle quality. By adding fillers, the slipperiness is improved and the generation of squeaking noise can be reduced. On the other hand, as shown in Table 1, fillers with a large particle diameter tend to have a deteriorated water-stopping property compared to fillers with a small particle diameter, while the noise prevention property is improved. This is thought to be due to the effect of a minute gap being created between the filler on the surface of the coating 50 of the seal portion 20 and the body 2 when the opening / closing body 1 is closed and the weatherstrip 200 comes into contact with the body 2. In other words, as shown in Figure 3(a), when a filler with a small particle size is added, the gap is smaller compared to a filler with a large particle size, so the amount of water that can penetrate is small and the water-sealing performance is good. On the other hand, as shown in Figure 3(b), when a filler with a large particle size is added, the gap is larger compared to a filler with a small particle size, so the water-sealing performance is considered to be worse.

[0004] [Table 1]

[0005] Thus, conventional automotive weatherstrips, which have a coating film with filler added to the surface of the sealing portion, have had conflicting properties in terms of noise prevention and watertightness. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Patent No. 7418641 [Patent Document 2] Japanese Patent Publication No. 2009-1710 [Patent Document 3] Japanese Patent Publication No. 2000-313234 [Overview of the project] [Problems that the invention aims to solve]

[0007] Therefore, the object of the present invention is to provide a weatherstrip that can maintain noise prevention and ensure watertightness even when a filler is present in the coating film formed on the surface of the sealing portion. [Means for solving the problem]

[0008] To achieve the above objective, the weatherstrip of the present invention is a weatherstrip (200) comprising a mounting base (10) attached to the periphery of a vehicle opening (1) or the periphery of a body opening (2), and a sealing portion (20) integrally molded with the mounting base (10) and elastically contacting the periphery of the body opening (2) or the periphery of the opening (1) when the opening (1) is closed, A coating film (50) is formed on the surface of the sealing portion (20), in which a base (60) to which fillers (70) of multiple particle sizes are added. The filler (70 (70A)) that protrudes most from the base (60) has a particle diameter of 15 to 20 μm and a 10% deformation strength of 0.1 MPa or less.

[0009] Furthermore, the weatherstrip of the present invention is a weatherstrip (200) comprising a mounting base (10) attached to the periphery of the opening (1) of a vehicle or the periphery of the opening (2) of the body (2), and a sealing portion (20) integrally molded with the mounting base (10) and elastically contacting the periphery of the opening (2) of the body (2) or the periphery of the opening (1) when the opening (1) is closed, A coating film (50) is formed on the surface of the sealing portion (20), in which a base (60) to which fillers (70) of multiple particle sizes are added. The filler (70) contained in the base (60) is characterized in that the maximum particle size is 15 to 20 μm and its 10% deformation strength is 0.1 MPa or less.

[0010] Furthermore, the weatherstrip of the present invention is a weatherstrip (200) comprising a mounting base (10) attached to the periphery of the opening (1) of a vehicle or the periphery of the opening (2) of the body (2), and a sealing portion (20) integrally molded with the mounting base (10) and elastically contacting the periphery of the opening (2) of the body (2) or the periphery of the opening (1) when the opening (1) is closed, A coating film (50) is formed on the surface of the sealing portion (20), in which a base (60) to which fillers (70) of multiple particle sizes are added. The filler (70(70A)) located on the outermost surface of the seal portion (20) has a particle diameter of 15 to 20 μm and a 10% deformation strength of 0.1 MPa or less.

[0011] Furthermore, the weatherstrip of the present invention is a weatherstrip (200) comprising a mounting base (10) attached to the periphery of the opening (1) of a vehicle or the periphery of the opening (2) of the body (2), and a sealing portion (20) integrally molded with the mounting base (10) and elastically contacting the periphery of the opening (2) of the body (2) or the periphery of the opening (1) when the opening (1) is closed, A coating film (50) is formed on the surface of the sealing portion (20), in which a base (60) to which fillers (70) of multiple particle sizes are added. The filler (70 (70A)) that protrudes most from the base (60) has a particle diameter of 15 μm or more, and its 10% deformation strength is 0.1 MPa or less.

[0012] Furthermore, the present invention is characterized in that the base (60) has a hardness of 46 MPa or less when measured with a nanoindentation tester with the maximum indentation load of the indenter set to 20 μN.

[0013] Furthermore, the present invention is characterized in that the thickness (S) of the base (60) is 20 μm or less.

[0014] The symbols in parentheses indicate the corresponding elements or matters described in the drawings and the embodiments for carrying out the invention described later. [Effects of the Invention]

[0015] According to the present invention, a weatherstrip comprises a mounting base attached to the periphery of a vehicle's opening / closing body or the periphery of a body opening, and a sealing portion integrally molded with the mounting base and elastically contacting the periphery of the body opening or the periphery of the opening / closing body when the opening / closing body is closed, wherein the sealing portion has a coating film formed on its surface with fillers of multiple particle sizes added to the base. In this weatherstrip, the particle size of the filler that protrudes the most from the base, or the particle size of the filler located furthest from the surface of the sealing portion, is large at 15 to 20 μm, thus improving the noise prevention performance of the sealing portion. In addition, because the filler has a small 10% deformation strength of 0.1 MPa or less, the filler, which is sandwiched between the sealing portion and the mating part it faces (the body opening perimeter when the weatherstrip is attached to the perimeter of a vehicle's opening or closing mechanism such as a door, or conversely when the weatherstrip is attached to the perimeter of the opening or closing mechanism), deforms, reducing the gap between the filler and the mating part, thereby preventing deterioration of watertightness. Thus, by using a filler with a large particle size and low 10% deformation strength, it is possible to achieve both noise prevention and watertightness.

[0016] Furthermore, according to the present invention, a weatherstrip comprises a mounting base that is attached to the periphery of a vehicle opening or closing body or the periphery of a body opening, and a sealing portion integrally molded with the mounting base and elastically contacting the periphery of the body opening or the periphery of the opening or closing body when the opening or closing body is closed, wherein the sealing portion has a coating film formed on its surface in which a plurality of particle sizes of fillers are added to the base, and since the maximum particle size of the filler contained in the base is large, at 15 to 20 μm, the noise prevention performance of the sealing portion can be improved. In addition, because the filler has a small 10% deformation strength of 0.1 MPa or less, the filler, which is sandwiched between the sealing portion and the mating part it faces (the body opening perimeter when the weatherstrip is attached to the perimeter of a vehicle's opening or closing mechanism such as a door, or conversely when the weatherstrip is attached to the perimeter of the opening or closing mechanism), deforms, reducing the gap between the filler and the mating part, thereby preventing deterioration of watertightness. Thus, by using a filler with a large particle size and a small 10% deformation strength, it is possible to achieve both noise prevention and water stoppage properties.

[0017] In addition, according to the present invention, even if the upper limit value of the particle size is not limited, such as when the particle size of the filler protruding most from the base is 15 μm or more and its 10% deformation strength is 0.1 MPa or less, it is possible to achieve both noise prevention and water stoppage properties.

[0018] Also, according to the present invention, since the hardness when the base is measured with the maximum indentation load of the indenter set to 20 μN by a nanoindentation tester is 46 MPa or less, the noise prevention property can be further improved.

[0019] Further, according to the present invention, while the average particle size of the filler is 15 to 20 μm, the thickness of the base is set to 20 μm or less, so that the amount of the filler not exposed on the surface of the coating film is reduced, and the ability of the filler can be fully exerted.

Brief Description of the Drawings

[0020] [Figure 1] It is a cross-sectional view showing a weatherstrip 200 according to an embodiment of the present invention. [Figure 2] It is a cross-sectional view showing the state in which the weatherstrip 200 shown in FIG. 1 is bent. [Figure 3] It is an enlarged cross-sectional view taken along line A-A of FIG. 2 schematically showing a main part of a weatherstrip 200 having a coating film formed according to a conventional example. [Figure 4] It is an enlarged cross-sectional view taken along line A-A of FIG. 2 schematically showing a main part of a weatherstrip 200 having a coating film formed according to an embodiment of the present invention. [Figure 5] It is an enlarged cross-sectional view schematically showing a main part of a weatherstrip 200 having another coating film formed according to an embodiment of the present invention. [Figure 6] It is an enlarged cross-sectional view showing the state in which the surface of the coating film shown in FIG. 5 is worn. [Modes for carrying out the invention]

[0021] A weatherstrip 200 according to an embodiment of the present invention will be described with reference to Figures 1, 2, and 4. This weatherstrip 200 includes a mounting base 10 that is attached to the opening / closing mechanism 1 of the vehicle, in this case the side door 1, and a hollow sealing portion 20 made of sponge rubber with a coating 50 formed on its surface that is integrally molded with the mounting base 10 and elastically contacts the periphery of the opening 2 of the body 2 when the side door 1 is closed. Note that the thickness of the coating 50 shown in the drawing is for illustrative purposes only. The actual thickness of the coating is measured in microns (μm), while the thickness of the hollow seal section 20 is measured in millimeters (mm). Therefore, the thickness of the coating will be on the order of approximately 1 / 1000th of the thickness of the hollow seal section 20.

[0022] As the sponge rubber constituting the hollow sealing portion 20 of the weatherstrip 200 according to the embodiment of the present invention, one with a specific gravity of 0.40 was used.

[0023] The specific gravity can be determined by separating the hollow seal portion 20 of the weatherstrip 200 by cutting it out, and then using the underwater displacement method.

[0024] The hollow seal portion 20 is made of a rubber material mainly composed of EPDM (ethylene propylene diene rubber), but it is not limited to EPDM; other synthetic rubber materials or various thermoplastic elastomers may also be used.

[0025] The coating 50 formed on the surface of the hollow seal portion 20 is, as shown in Figure 4, a base 60 with filler 70 added, where the average particle size of the filler 70 in the coating 50 is 15 to 20 μm, and the 10% deformation strength of the filler 70 is 0.1 MPa or less. In this case, filler 70 with an average particle size of 20 μm and a 10% deformation strength of 0.1 MPa was used.

[0026] This is because, as shown in Table 2 below, the noise prevention performance improved as the average particle size of the filler increased from 8 μm to 15 μm to 20 μm, and the water-stopping performance improved as the 10% deformation strength decreased from 25.0 MPa to 10.0 MPa to 0.5 MPa to 0.1 MPa, as shown in Table 3.

[0027] The 10% deformation strength of the filler was measured using a microparticle crushing force measuring device NS-A300 (manufactured by NanoSeeds Co., Ltd.) in accordance with JIS Z 8844:2019, Method for Measuring the Fracture Strength and Deformation Strength of Microparticles. The particle diameter was measured using image analysis software, determining the diameter (length) of the particle sandwiched between the indenter and the plane to which the particle was attached from the image taken during measurement.

[0028] Filler 70 uses silicone particles, but other materials such as polyethylene, nylon, acrylic, urethane, and fluorine may be used as long as the 10% deformation strength is 0.1 MPa or less, not limited to silicone.

[0029] Base 60 used was a water-based polyurethane resin (30% solids content) blended with a carbodiimide-based curing agent, but it is not particularly limited to this.

[0030] Furthermore, the hardness of the base 60 is preferably 46 MPa or less, and in this case, one with a hardness of 46 MPa was used.

[0031] This is because, as shown in Table 4 below, evaluation revealed that the lower the hardness of the base 60 (205 MPa → 122 MPa → 46 MPa → 26 MPa), the better the noise suppression performance.

[0032] The hardness of Base 60 was measured using an Anton Paar UNHT3 nanoindentation tester and a Berkovich indenter. The maximum indentation load was set to 20 μN, and the loading / unloading speed was set to 600 μN / min, in accordance with ISO 14577. The hollow seal section 20 was cut into a 10 mm x 10 mm square, which was used as the measurement sample. The thickness of the measurement sample was approximately 1.8 mm.

[0033] The weight ratio of filler 70 to base 60 is preferably 1 part filler 70 to 6 parts base 60 or less. In this case, the mixture was formulated so that the ratio of filler 70 to base 60 was 1 part filler 70 to 2 parts base 60.

[0034] Note that the noise prevention evaluation in Tables 2 and 4 is based on a sensory evaluation of the occurrence of squeaking noises when the surface is semi-wet. "○" indicates that no noise was detected, "△" indicates that a slight noise was detected, and "×" indicates that a noise was detected. Furthermore, the water-stopping evaluation in Table 3 simulates rainy weather conditions and assesses water leakage when the weatherstrip elastically contacts opposing surfaces. The time it takes for water to pass through the contact points is measured, with "○" indicating 30 minutes or more, "△" indicating 10 to less than 30 minutes, and "×" indicating less than 10 minutes.

[0035] The thickness S of the base 60 is preferably 20 μm or less from the viewpoint of filler exposure. More preferably 17 μm or less, and even more preferably 15 μm or less. Here, the thickness S of the base 60 is set to 20 μm. The lower limit of the thickness S is not particularly limited, but from the viewpoint of maintaining the durability of the hollow seal portion 20, it is preferably 1 μm or more, more preferably 2 μm or more, and even more preferably 3 μm or more.

[0036] The thickness S of the base 60 was determined by using image analysis software to measure the length of the base 60 perpendicular to the hollow seal portion 20 at the measurement point, from an image of the surface of the cross-section of the hollow seal portion 20 magnified using a digital microscope.

[0037] [Table 2]

[0038] [Table 3]

[0039] [Table 4]

[0040] With the weatherstrip 200 configured in this way, the average particle size of the filler 70 in the coating film 50 formed on the surface of the hollow seal portion 20 is large, at 15 to 20 μm, which improves the noise prevention performance when the hollow seal portion 20 is elastically in contact with the periphery of the opening of the body 2. In addition, since the 10% deformation strength of the filler 70 is small, at 0.1 MPa or less, as shown in Figure 4, the filler 70 sandwiched between the hollow seal portion 20 and the mating part (opening edge of body 2) that it faces deforms, reducing the gap between the filler and the mating part (opening edge of body 2), thereby preventing deterioration of watertightness. Thus, by using a filler with a large particle size and low 10% deformation strength, it is possible to achieve both noise prevention and watertightness.

[0041] Furthermore, by setting the hardness of the base 60 to 46 MPa or less, the noise prevention performance can be further improved.

[0042] Furthermore, while the average particle size of filler 70 is 15-20 μm, the base thickness is set to 20 μm or less. This reduces the amount of filler 70 that is not exposed on the surface of the coating, allowing filler 70 to fully demonstrate its capabilities.

[0043] In this embodiment, the case in which one type of silicone particle is used as the filler 70 is shown, but multiple types of silicone particles may be used, and as long as the 10% deformation strength is 0.1 MPa or less, silicone may be combined with other materials such as polyethylene, nylon, acrylic, urethane, and fluorine, or with other materials other than silicone as described above.

[0044] Next, as shown in Tables 5 and 6, the results of evaluating noise prevention and watertightness are presented for cases where one type of silicone particle is used as filler 70 (paint A) and for cases where multiple fillers 70 are combined (paints B, C, D, E).

[0045] [Table 5]

[0046] [Table 6]

[0047] Paint A is a mixture of a base 60, which is a water-based polyurethane resin (30% solids) blended with a carbodiimide-based curing agent, and then mixed with deionized water and filler A. Filler A is silicone particles with an average particle size of 20 μm and a 10% deformation strength of 0.1 MPa. The mixture is prepared in the following proportions: 100 parts by weight of the main component, water-based polyurethane resin, 5 parts by weight of the curing agent, 30 parts by weight of deionized water, and 30 parts by weight of filler A (total of 165 parts by weight).

[0048] Paint B is a mixture of a base 60, which is a water-based polyurethane resin (30% solids) blended with a carbodiimide-based curing agent, to which deionized water and filler A are added, along with filler B. Filler A consists of silicone particles with an average particle size of 20 μm and a 10% deformation strength of 0.1 MPa, and filler B consists of silicone particles with an average particle size of 10 μm and a 10% deformation strength of 0.1 MPa. The mixture is prepared in the following proportions (total 165 parts by weight): 100 parts by weight of the main component, water-based polyurethane resin, 5 parts by weight of the curing agent, 30 parts by weight of deionized water, 10 parts by weight of filler A, and 20 parts by weight of filler B.

[0049] Paint C is a mixture of a base 60, which is a water-based polyurethane resin (30% solids) blended with a carbodiimide-based curing agent, to which deionized water and filler A are added, along with filler C. Filler A consists of silicone particles with an average particle size of 20 μm and a 10% deformation strength of 0.1 MPa, while filler C consists of relatively soft acrylic resin (PMMA) particles with an average particle size of 10 μm and a 10% deformation strength of 0.5 MPa. The mixture is prepared in the following proportions (total 165 parts by weight): 100 parts by weight of the main component, water-based polyurethane resin, 5 parts by weight of the curing agent, 30 parts by weight of deionized water, 10 parts by weight of filler A, and 20 parts by weight of filler C.

[0050] Paint D is a mixture of a base 60, which is a water-based polyurethane resin (30% solids) blended with a carbodiimide-based curing agent, to which deionized water and filler A are added, along with filler D. Filler A is a silicone particle with an average particle size of 20 μm and a 10% deformation strength of 0.1 MPa, while filler D is an acrylic resin (PMMA) particle with an average particle size of 10 μm and a 10% deformation strength of 10.0 MPa, and is of relatively medium hardness. The mixture is prepared in the following proportions (total 165 parts by weight): 100 parts by weight of the main component, water-based polyurethane resin, 5 parts by weight of the curing agent, 30 parts by weight of deionized water, 10 parts by weight of filler A, and 20 parts by weight of filler D.

[0051] Paint E is a mixture of a base 60, which is a water-based polyurethane resin (30% solids) blended with a carbodiimide-based curing agent, to which deionized water and filler A are added, along with filler E. Filler A is a silicone particle with an average particle size of 20 μm and a 10% deformation strength of 0.1 MPa, while filler E is a relatively hard acrylic resin (PMMA) particle with an average particle size of 10 μm and a 10% deformation strength of 25.0 MPa. The mixture is prepared in the following proportions (total 165): 100 parts by weight of the main component, water-based polyurethane resin, 5 parts by weight of the curing agent, 30 parts by weight of deionized water, 10 parts by weight of filler A, and 20 parts by weight of filler E.

[0052] When paints A, B, C, D, and E, formulated in this manner, were applied to the surface of the hollow seal portion 20 of the weatherstrip 200, both noise prevention and watertightness were good, as shown in Table 7. The evaluation conditions and symbols in Table 7 are the same as those in Tables 2, 3, and 4.

[0053] [Table 7]

[0054] As shown in Figure 5, the surface of the hollow seal portion 20 of the weatherstrip 200 may have an uneven surface due to the protrusion of fillers 70 of various particle sizes. Furthermore, when the product (weatherstrip 200) is shipped, as shown in Figure 5, the surface of the weatherstrip 200 is covered with a film of base 60, including the filler 70. However, if this area repeatedly comes into elastic contact with the periphery of the opening 2 of the vehicle body or the periphery of an opening / closing part 1 such as a door, as shown in Figure 6, the film of base 60 may wear down, exposing the protruding filler 70.

[0055] Furthermore, in this embodiment, the average particle size of the filler 70 added to the base 60 in the coating film 50 formed on the surface of the hollow seal portion 20 is set to 20 μm, and its 10% deformation strength is set to 0.1 MPa. However, the maximum particle size of the filler 70 contained in the base 60 may be 15 to 20 μm, and its 10% deformation strength may be 0.1 MPa or less.

[0056] Furthermore, focusing on the portion where the hollow seal portion 20 elastically contacts the periphery of the body 2 opening, it is effective for a filler 70 with excellent noise prevention and water-sealing properties to protrude from that portion. Therefore, as shown in Figure 6, it is preferable to use a filler 70 (70A) with a particle size of 15-20 μm for the filler 70 (70A) that protrudes most from the base 60 and has a 10% deformation strength of 0.1 MPa or less, or as shown in Figures 5 and 6, a filler 70 (70A) located furthest from the surface of the seal portion 20 with a particle size of 15-20 μm and has a 10% deformation strength of 0.1 MPa or less as the coating film 50. In the case of Figure 5, since the base 60 film is on the outermost surface, the filler 70 (70A) that protrudes the most from the surface of the seal portion 20 is the filler 70 located furthest from the surface of the seal portion 20.

[0057] Furthermore, as shown in Figure 6, the particle size of the filler 70 (70A) that protrudes most from the base 60 is set to 15-20 μm and its 10% deformation strength is 0.1 MPa or less. However, instead, the particle size of the filler (70 (70A)) that protrudes most from the base 60 is set to 15 μm or more and its 10% deformation strength is 0.1 MPa or less, without limiting the upper limit of the particle size.

[0058] In this embodiment, a door weatherstrip 200 attached along the periphery of the side door 1 and elastically contacting the periphery of the body 2 opening was described as an example. However, conversely, a door weatherstrip attached along the periphery of the body 2 opening and elastically contacting the periphery of the side door 1 when the door is closed may also be used. Furthermore, the hollow seal portion 20 may be solid, such as a lip. In addition, the hollow seal portion 20 is not limited to sponge rubber; it may be a single layer of solid rubber or a multi-layer structure of solid rubber and sponge rubber. The specific gravity of the sponge rubber may be higher or lower than 0.40. Furthermore, it is applicable to any weatherstrip, such as weatherstrips attached to opening and closing parts of automobiles, such as back doors, trunk lids, and hoods. [Explanation of Symbols]

[0059] 1. Opening / closing mechanism (side door) 2 bodies 10 Mounting base 20 Hollow seal section 50 coating film 60 base 70 Filler 70A The outermost filler 200 Weatherstrip W water

Claims

1. A weatherstrip comprising a mounting base attached to the periphery of a vehicle's opening / closing body or the periphery of a body opening, and a sealing portion integrally molded with the mounting base and elastically contacting the periphery of the body opening or the periphery of the opening / closing body when the opening / closing body is closed, A coating film is formed on the surface of the sealing portion, in which a base to which fillers of multiple particle sizes are added. A weatherstrip characterized in that the particle size of the filler that protrudes most from the base is 15 to 20 μm, and its 10% deformation strength is 0.1 MPa or less.

2. A weatherstrip comprising a mounting base attached to the periphery of a vehicle's opening / closing body or the periphery of a body opening, and a sealing portion integrally molded with the mounting base and elastically contacting the periphery of the body opening or the periphery of the opening / closing body when the opening / closing body is closed, A coating film is formed on the surface of the sealing portion, in which a base to which fillers of multiple particle sizes are added. A weatherstrip characterized in that the maximum particle size of the filler contained in the base is 15 to 20 μm, and its 10% deformation strength is 0.1 MPa or less.

3. A weatherstrip comprising a mounting base attached to the periphery of a vehicle's opening / closing body or the periphery of a body opening, and a sealing portion integrally molded with the mounting base and elastically contacting the periphery of the body opening or the periphery of the opening / closing body when the opening / closing body is closed, A coating film is formed on the surface of the sealing portion, in which a base to which fillers of multiple particle sizes are added. A weatherstrip characterized in that the particle size of the filler located on the outermost surface of the sealing portion is 15 to 20 μm, and its 10% deformation strength is 0.1 MPa or less.

4. A weatherstrip comprising a mounting base attached to the periphery of a vehicle's opening / closing body or the periphery of a body opening, and a sealing portion integrally molded with the mounting base and elastically contacting the periphery of the body opening or the periphery of the opening / closing body when the opening / closing body is closed, A coating film is formed on the surface of the sealing portion, in which a base to which fillers of multiple particle sizes are added. A weatherstrip characterized in that the particle diameter of the filler that protrudes most from the base is 15 μm or more, and its 10% deformation strength is 0.1 MPa or less.

5. The weatherstrip according to any one of claims 1 to 4, characterized in that the base has a hardness of 46 MPa or less when measured with a nanoindentation tester with the maximum indentation load of the indenter set to 20 μN.

6. The weatherstrip according to claim 1, characterized in that the thickness of the base is 20 μm or less.

7. The weatherstrip according to claim 5, characterized in that the thickness of the base is 20 μm or less.

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