JP2928412B2 - Automotive weather strip - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weather strip for automobiles, and more particularly, to a window glass sliding portion comprising a laminate comprising a thermoplastic elastomer base layer and a lubricating resin surface layer. The present invention relates to an automotive weather strip.

[0002]

2. Description of the Related Art In general, a window glass of a vehicle of an automobile needs to be opened and closed by raising and lowering for ventilation and ventilation or for communication with the outside of the vehicle. In order to facilitate the raising and lowering operation of the windowpane, and to enable a tight (liquid-tight) sealing operation between the windowpane and the windowpane storage section, a weather is provided between the windowpane and the windowpane storage section. A guide member called a strip is provided.

Conventional weather strips for automobiles include a thin plate made of a soft synthetic resin such as a soft vinyl chloride resin or a vulcanized rubber such as an ethylene-propylene-diene copolymer rubber, and a thin plate provided on the surface of the thin plate. Another example is a weather strip for automobiles, which includes a sliding contact member made of a polyamide resin, a so-called nylon, which is curved so that a window glass slides. In addition, a thin plate made of hard vinyl chloride resin and a soft vinyl chloride resin sliding contact member provided on the surface of the thin plate and curved so that the window glass is in sliding contact with the window glass are provided. An automotive weatherstrip in which nylon short fibers are so-called electrostatically flocked by applying an adhesive to a portion that can be brought into contact is used.

However, compared to conventional weather strips for automobiles, automobiles are more excellent in heat resistance, durability, close contact with the window glass when closed, and light sliding with the window glass during up / down operation. The emergence of weather strips has been desired in recent years. Further, the latter weather strip for automobiles has a drawback that the electrostatic flocking is time-consuming due to the large number of steps, and the cost is increased. In addition, in such a weather strip for automobiles, since electrostatic flocking is performed using an adhesive, there is also a problem in durability, and there is also a disadvantage that nylon short fibers are easily peeled off from the sliding contact member with the passage of time and outdoor exposure. is there.

The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems of weather strips for automobiles, and have developed a modified polyolefin-based thermoplastic elastomer as a material constituting at least a sliding portion of a window glass of the weather strip. Select, on the modified polyolefin-based thermoplastic elastomer layer, a specific ultra-high molecular weight polyolefin composition and a slip resin layer comprising a slip resin such as a polyamide resin, a thermoplastic polyurethane resin, or a thermoplastic polyester resin. If heat-sealed and laminated, in some cases further brushed decoration on the surface of the slippery resin layer, the manufacturing operation is easy, heat resistance, durability, close contact with the window glass when closed, and It is possible to obtain a weatherstrip for an automobile that is excellent in light sliding property with a window glass during a lifting operation. The heading, which resulted in the completion of the present invention.

[0006]

SUMMARY OF THE INVENTION The object of the present invention is to solve the problems associated with the prior art as described above, which can be manufactured by simplifying the manufacturing process, and has heat resistance, durability and closure. It is an object of the present invention to provide a weatherstrip for an automobile which is excellent in close contact with a window glass at the time of operation and light sliding with the window glass at the time of a lifting operation.

[0007]

SUMMARY OF THE INVENTION A weather strip for an automobile according to the present invention comprises a thin core material made of a polyolefin resin,
An automotive weatherstrip comprising a sliding contact member provided on the surface of the core material, wherein at least a portion of the sliding contact member that can contact a window glass is laminated on a modified polyolefin-based thermoplastic elastomer layer. The ultra-high molecular weight polyolefin composition and a lubricating resin layer comprising a lubricating resin, the ultra-high molecular weight polyolefin composition,
(A) 90 to 10 parts by weight of an ultrahigh molecular weight polyolefin having an intrinsic viscosity [η] of 6 dl / g or more, and (B) polyolefin 10 to 9 having an intrinsic viscosity [η] of 0.1 to 5 dl / g.
And the ultrahigh molecular weight polyolefin (A) and / or polyolefin (B) is at least one kind of a modifying monomer (C) selected from unsaturated carboxylic acids and derivatives thereof. ), Wherein the lubricating resin is a lubricating resin selected from the group consisting of a polyamide resin, a thermoplastic polyurethane resin and a thermoplastic polyester resin.

[0008]

DETAILED DESCRIPTION OF THE INVENTION Hereinafter, an example of an automotive weather strip according to the present invention will be described in detail with reference to schematic diagrams.

FIG. 1 shows a cross-sectional structure of an example of a weather strip for a vehicle according to the present invention.
The sliding member 3 is provided on the surface of the core member 2 and is curved so that the window glass slides. In the present invention, the form of the sliding contact member 3 may be not only the above-mentioned curved form but also a linear form.

[0010] At least a portion of the sliding contact member 3 which can come into contact with the window glass is made of an ultra-high molecular weight polyolefin composition and a lubricating resin laminated on the modified polyolefin-based thermoplastic elastomer layer 4 as a base layer. It is composed of a slippery resin layer 5.

[0011] The weather strip for an automobile of the present invention comprises:
For example, the core material 2, the modified polyolefin-based thermoplastic elastomer layer 4 and the lubricating resin layer 5 are integrally formed by a three-layer coextrusion molding method. After the integral molding, the surface of the lubricating resin layer 5 may be subjected to a brushed decoration treatment.
As a method of decorating the brush, (a) a method of buffing with emery paper to decorate the surface of the slippery resin layer with a brush,
(B) a method of raising and decorating the surface of the slippery resin layer by passing through a needle cloth roll; (c) a method of raising and decorating the surface of the slippery resin layer by sanding with a belt sander or a drum sander; A conventionally known brushed decorating method such as a method of bombarding the surface of a slipping resin layer by colliding thermal microscopic bodies described in JP-A-62-275732 is used.

In FIG. 2, a window glass 7 which can be opened and closed by a vertical movement is provided on a door 6 of an automobile. Although not shown at the upper end portion 8 of the window glass 7 storage portion,
An automobile weather strip 1 (commonly called drainer, belt line molding, outer molding, inner molding, etc.) as shown in FIG. 1 is fixed inside and outside a door 6, and a window glass 7 moves up and down through a gap between them. I do.

According to the present invention, the modified polyolefin-based thermoplastic elastomer layer 4 and the modified polyolefin-based thermoplastic elastomer layer 4 are provided on at least a portion of the sliding contact member 3 constituting the automotive weather strip 1 which is in contact with the window glass 7. A lubricating resin layer 5 composed of an ultrahigh molecular weight polyolefin composition and a lubricating resin thermally fused to the surface of the elastomer layer 4
Are provided.

That is, the modified polyolefin-based thermoplastic elastomer used in the present invention can be thermoformed into an arbitrary shape and size, and has elasticity required for a sliding portion of a window glass of an automobile weather strip. It has excellent properties such as flexibility and compressibility, and also has excellent properties such as durability, weather resistance, and water resistance. This modified polyolefin-based thermoplastic elastomer is modified by grafting a polar group-containing monomer such as maleic anhydride. The modified polyolefin-based thermoplastic elastomer exhibits strong adhesion to the ultra-high-molecular-weight polyolefin composition serving as the surface material layer and the lubricating resin layer 5 composed of a lubricating resin, and is thermally fused to the lubricating resin layer 5. Due to the interlayer adhesion strength immediately after bonding and over time, furthermore,
It is possible to form a laminated structure having excellent interlayer adhesion strength after the weather resistance test.

According to the present invention, by adopting the above-mentioned structure, the friction coefficient with the window glass is provided by providing the lubricating resin layer 5 composed of the ultrahigh molecular weight polyolefin composition and the lubricating resin as the surface material layer. When the windowpane is closed, close (liquid-tight) contact with the windowpane is possible, and when the windowpane moves up and down, the sliding resistance is reduced, enabling a smooth and easy opening and closing operation. Becomes

Polyolefin resin In the present invention, the polyolefin resin constituting the core material is not particularly limited as long as it is a resin which is melt-fused with the modified polyolefin thermoplastic elastomer constituting the sliding contact member. In the present invention, polypropylene, filled polypropylene, glass fiber reinforced polypropylene, high-crystal polypropylene, and the like are preferably used.

At the time of the above-mentioned three-layer coextrusion molding, a core may be added as necessary to form a core material. Modified polyolefin-based thermoplastic elastomer In the present invention, the following thermoplastic elastomers are preferably used as the modified polyolefin-based thermoplastic elastomer constituting a part of the sliding member. (I) Peroxide-crosslinked olefin copolymer rubber 9
5 to 10 parts by weight, and (ii) 5 to 90 parts by weight of the olefin-based plastic [the total amount of the components (i) and (ii) is 100 parts by weight].
And (iii) an α, β-unsaturated carboxylic acid or a derivative thereof,
Or 0.01 to 10 parts by weight of a polar group-containing monomer such as an unsaturated epoxy monomer, is dynamically heat-treated in the presence of an organic peroxide to form a partially crosslinked modified product. It is a polyolefin-based thermoplastic elastomer.

The peroxide-crosslinked olefin copolymer rubber (i) used in the present invention is, for example, ethylene
Amorphous, elastic copolymers containing olefins as the main component, such as propylene / non-conjugated diene copolymer rubber and ethylene / butadiene copolymer rubber, which are mixed with an organic peroxide and kneaded under heating. Refers to a rubber whose flowability is reduced or becomes non-flowable due to crosslinking.

Specific examples of the non-conjugated diene include dicyclopentadiene, 1,4-hexadiene, dicyclooctadiene, methylene-norbornene, and ethylidene-diene.
Norbornene and the like can be mentioned.

In the present invention, the molar ratio of the ethylene component unit to the propylene component unit (ethylene component unit / propylene component unit) is 50/50 to 50% in the peroxide-crosslinked olefin copolymer rubber as described above. 90/1
Ethylene / propylene copolymer rubber and ethylene / propylene / non-conjugated diene copolymer rubber in the range of 0, especially 55/45 to 85/15 are preferably used. Among them, ethylene / propylene / non-conjugated diene copolymer rubber, particularly ethylene / propylene / ethylidene norbornene copolymer rubber, is preferable because it can provide a thermoplastic elastomer having excellent heat resistance, tensile strength characteristics and rebound resilience.

The peroxide-crosslinked olefin copolymer rubber has a Mooney viscosity ML _{1 + 4} (100 ° C.) of 1
It is preferably in the range of 0 to 250, particularly 40 to 150. If a peroxide-crosslinked olefin copolymer rubber having a Mooney viscosity ML _{1 + 4} (100 ° C.) of less than 10 is used, the resulting thermoplastic elastomer composition tends to have low tensile strength characteristics. On the other hand, Mooney viscosity ML
_When a peroxide-crosslinked olefin copolymer rubber having a _{1 + 4} (100 ° C.) of more than 250 is used, the resulting thermoplastic elastomer composition tends to have reduced fluidity.

Further, the peroxide-crosslinked olefin copolymer rubber preferably has an iodine value of 25 or less. When a peroxide crosslinked olefin copolymer rubber having an iodine value within the above range is used, a thermoplastic elastomer having a good balance between fluidity and rubber properties can be obtained.

In the present invention, the peroxide-crosslinked olefin copolymer rubber (i) comprises 95 to 10 parts by weight,
It is preferably used in a proportion of 95 to 60 parts by weight. However, the total amount of the peroxide-crosslinked olefin copolymer rubber (i) and the olefin plastic (ii) is 100 parts by weight.

When the peroxide-crosslinked olefin-based copolymer rubber (i) is used in the above ratio, the resulting graft-modified polyolefin-based elastomer has excellent moldability and rubber-like properties such as rubber elasticity. ing.

The olefin plastic (ii) used in the present invention comprises a crystalline high molecular weight solid product obtained by polymerizing one or more monoolefins by either a high pressure method or a low pressure method. Examples of such resins include isotactic or syndiotactic monoolefin polymer resins. These representative resins are commercially available.

Specific examples of suitable starting olefins include ethylene, propylene, 1-butene, 1-pentene, 1-pentene,
Hexene, 2-methyl-1-propene, 3-methyl-1-pentene, 4-methyl-1-pentene, 5-methyl-1-hexene, 1-
Octene, 1-decene, and a mixed olefin of two or more of these are exemplified. In the present invention, any of these homopolymerization and copolymerization may be adopted as long as a resinous material can be obtained.

In the present invention, a particularly preferable olefin plastic is a peroxide-decomposable olefin plastic. In the present invention, a peroxide-decomposable olefin-based plastic refers to an olefin-based plastic which is mixed with a peroxide and kneaded under heating to be thermally decomposed to reduce the molecular weight and increase the fluidity of the resin. Tactic polypropylene; copolymers of propylene with other small amounts of α-olefins, such as propylene-ethylene copolymers, propylene-1-butene copolymers, propylene-1-hexene copolymers, propylene-4-methyl -1-pentene copolymer and the like.

The olefin-based plastic used in the present invention has a melt index (ASTM-D-1238).
(−65 T, 230 ° C.) is preferably in the range of 0.1 to 50, particularly 5 to 20.

In the present invention, the olefin plastic contributes to the improvement of the fluidity and the heat resistance of the elastomer composition. In the present invention, the olefin-based plastic (ii) is used in a proportion of 5 to 90 parts by weight, preferably 5 to 40 parts by weight. However, the total amount of the peroxide-crosslinked olefin copolymer rubber (i) and the olefin plastic (ii) is 100 parts by weight.

When the olefin-based plastic (ii) is used in the above ratio, the obtained graft-modified polyolefin-based elastomer has excellent rubber-like properties such as rubber elasticity and excellent fluidity. Excellent in nature.

In the present invention, examples of the modifier (iii) used for graft-modifying the polyolefin-based thermoplastic elastomer include monomers such as α, β-unsaturated fatty acids or derivatives thereof, and unsaturated epoxy monomers. Can be

Specific examples of α, β-unsaturated fatty acids or derivatives thereof include unsaturated carboxylic acids such as acrylic acid, methacrylic acid, crotonic acid, maleic acid and itaconic acid; maleic anhydride, itaconic anhydride, Acid anhydrides such as norbornene carboxylic anhydride and tetrahydrophthalic anhydride; and hydroxyalkyl esters or hydroxyalkoxyalkyl esters such as 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 3-hydroxypropyl acrylate, and hydroxyethoxy methacrylate. . In the present invention, maleic anhydride and hydroxyethyl acrylate are preferably used.

Further, specific examples of the unsaturated epoxy monomer include glycidyl esters such as glycidyl acrylate, glycidyl methacrylate, glycidyl itaconate and glycidyl crotonate. In the present invention, glycidyl methacrylate is preferably used.

Specific examples of the above organic peroxide include dicumyl peroxide, di-tert-butyl peroxide, and 2,5-dimethyl-2,5-di- (tert-butylperoxy).
Hexane, 2,5-dimethyl-2,5-di- (tert-butylperoxy) hexyne-3, 1,3-bis (tert-butylperoxyisopropyl) benzene, 1,1-bis (tert-butylperoxy)- 3,3,5-trimethylcyclohexane, n-butyl
-4,4-bis (tert-butylperoxy) valerate, benzoyl peroxide, p-chlorobenzoyl peroxide, 2,4-dichlorobenzoyl peroxide, tert-butylperoxybenzoate, tert-butylperbenzoate, tert-butylperoxyisopropyl carbonate, Diacetyl peroxide, lauroyl peroxide, tert-butylcumyl peroxide and the like.

Of these, 2,5-dimethyl-2,5-di- (tert-butylperoxy) hexane and 2,5-dimethyl-2,5-di-, in terms of odor and scorch stability. (Tert-butylperoxy) hexyne-3,1,3-bis (tert-butylperoxyisopropyl) benzene, 1,1-bis (tert-butylperoxy) -3,3,5-trimethylcyclohexane, n-butyl-4 1,4-Bis (tert-butylperoxy) valerate is preferred, and 1,3-bis (tert-butylperoxyisopropyl) benzene is most preferred.

In the present invention, the organic peroxide is
It is used in a proportion of 0.05 to 3% by weight, preferably 0.1 to 1% by weight. However, the total amount of the peroxide-crosslinked olefin copolymer rubber (i), the olefin plastic (ii) and the α, β-unsaturated carboxylic acid or its derivative, or the unsaturated epoxy monomer (c) is 100% by weight. %.

In the present invention, sulfur, p-quinonedioxime, p, p'-dibenzoylquinonedioxime, N-methyl-N
-4- dinitrosoaniline, nitrosobenzene, diphenylguanidine, peroxy crosslinking aids such as trimethylolpropane-N, N'-m-phenylenedimaleimide, or divinylbenzene, triallyl cyanurate, ethylene glycol dimethacrylate, Polyfunctional methacrylate monomers such as diethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, allyl methacrylate, and polyfunctional vinyl monomers such as vinyl butyrate and vinyl stearate can be blended.

By using a compound as described above,
A uniform and mild crosslinking reaction can be expected. Particularly, in the present invention, divinylbenzene is most preferred. Divinylbenzene is easy to handle, has good compatibility with the peroxide-crosslinked olefin copolymer rubber and the olefin plastic, which are the main components of the above-mentioned crosslinked product, and has the effect of solubilizing the organic peroxide. Have
Since it acts as a dispersant for the organic peroxide, a thermoplastic elastomer having a uniform cross-linking effect by heat treatment and a good balance between fluidity and physical properties can be obtained. In the present invention, the crosslinking aid or the polyfunctional vinyl monomer as described above is used in an amount of from 0.1 to 2 with respect to the whole of the above-mentioned crosslinked product.
It is preferably used in a proportion of 0.3% to 1% by weight. If the compounding ratio of the crosslinking assistant or the polyfunctional vinyl monomer exceeds 2% by weight, the crosslinking reaction proceeds too quickly if the compounding amount of the organic peroxide is large, so that the resulting modified polyolefin-based thermoplastic elastomer is
When the fluidity is poor and the amount of the organic peroxide is small, the crosslinking aid and the polyfunctional vinyl monomer remain as unreacted monomers in the modified polyolefin-based thermoplastic elastomer, and the modified polyolefin-based thermoplastic Elastomers may undergo changes in physical properties due to heat history during processing and molding. Therefore, the co-agent and the polyfunctional vinyl monomer should not be compounded in excess.

The term "dynamically heat-treating" refers to kneading the above components in a molten state. As the kneading device, a conventionally known kneading device, for example, an open-type mixing roll, a non-open-type Banbury mixer, an extruder, a kneader, a continuous mixer, or the like is used. Of these, a non-open type kneading apparatus is preferable, and kneading is preferably performed in an atmosphere of an inert gas such as nitrogen gas or carbon dioxide gas.

The kneading is preferably carried out at a temperature at which the half-life of the organic peroxide used is less than 1 minute.
The kneading temperature is usually 150 to 280 ° C, preferably 17 to 280 ° C.
The temperature is 0 to 240 ° C, and the kneading time is 1 to 20 minutes, preferably 3 to 10 minutes. The applied shearing force is usually determined in the range of 10 to 10 ⁴ sec ^-1 , preferably 10 ² to 10 ³ sec ^-1 .

The modified polyolefin-based thermoplastic elastomer used in the present invention is partially crosslinked.
The term “partially crosslinked” refers to a case where the gel content measured by the following method is in the range of 20 to 98%,
In the present invention, the gel content is preferably in the range of 45 to 98%.

[Measurement Method of Gel Content] As a sample, a pellet of a modified polyolefin-based thermoplastic elastomer was prepared for about 10 minutes.
0 mg is precisely weighed and placed in a closed container in 30 ml of cyclohexane sufficient for this pellet at 23 ° C. for 4 hours.
Soak for 8 hours.

Next, the sample is taken out on a filter paper and dried at room temperature for at least 72 hours until the weight becomes constant. The gel content is represented by the following equation. Gel content [%] = (dry weight after cyclohexane immersion)
÷ (weight before immersion in cyclohexane) × 100 The modified polyolefin-based thermoplastic elastomer used in the present invention has excellent fluidity.

Further, the modified polyolefin-based thermoplastic elastomer layer 4 as the base layer of the sliding contact member is excellent in rubber properties such as heat resistance, tensile properties, flexibility and rebound resilience, and also in terms of durability. The joint strength with the lubricating resin layer 5 is sufficiently practical.

Ultra-high molecular weight polyolefin composition In the present invention, the lubricating resin layer 5 comprises an ultra-high molecular weight polyolefin composition and a lubricating resin.

The ultrahigh molecular weight polyolefin composition used in the present invention has 90 to 10 parts by weight of an ultrahigh molecular weight polyolefin (A) having an intrinsic viscosity [η] of 6 dl / g or more, and an intrinsic viscosity [η] of 0.1. And the ultrahigh molecular weight polyolefin (A) and / or polyolefin (B) is selected from unsaturated carboxylic acids and derivatives thereof. It is modified with at least one kind of modifying monomer (C).

The above ultra high molecular weight polyolefin (A)
Is, for example, ethylene, propylene, 1-butene, isobutene, 1-pentene, 2-methyl-1-butene, 3-methyl-1-
Butene, 1-hexene, 3-methyl-1-pentene, 4-methyl
-1- pentene, 1-heptene, 1-octene, 1-decene, 1-
It is composed of a homopolymer or a copolymer of α-olefins such as dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, and 1-icosene. In the present invention, an ethylene homopolymer and a copolymer containing ethylene as a main component and comprising ethylene and another α-olefin are preferred.

The intrinsic viscosity [η] of this ultrahigh molecular weight polyolefin (A) measured at 135 ° C. in a decalin solvent is 6
dl / g or more, preferably 6 to 40 dl / g, more preferably 10 to 30 dl / g. In the present invention, the density (D: ASTM D1505) is particularly 0.920 g / c.
m ³ or more and melting point (Tm: ASTM D 3417) is 11
Ultrahigh molecular weight polyolefins of 5 ° C. or higher are preferred.

In the present invention, the ultrahigh molecular weight polyolefin (A) is used in an amount of 90 to 10 parts by weight, preferably 80 to 10 parts by weight, based on 100 parts by weight of the total amount of the ultrahigh molecular weight polyolefin (A) and the polyolefin (B). 10 parts by weight,
More preferably, it is used in a proportion of 50 to 10 parts by weight.

The polyolefin (B), which is a component of the ultrahigh molecular weight polyolefin composition, may be formed from the above-mentioned α-olefin homopolymer or copolymer, similarly to the ultrahigh molecular weight polyolefin (A). Become. In the present invention, ethylene homopolymers and copolymers containing ethylene and other α-olefins and containing ethylene as a main component are preferred.

The intrinsic viscosity [η] of this polyolefin (B) measured at 135 ° C. in a decalin solvent is 0.1 to 5 d
1 / g, preferably 0.3 to 4 dl / g. In the present invention, a polyolefin having a density of 0.92 to 0.97 g / cm ³ and a melting point of 115 to 145 ° C is particularly preferable.

In the present invention, the polyolefin (B) is used in an amount of 10 parts by weight based on 100 parts by weight of the total amount of the ultrahigh molecular weight polyolefin (A) and the polyolefin (B).
It is used in an amount of from 90 to 90 parts by weight, preferably from 20 to 90 parts by weight, more preferably from 50 to 90 parts by weight.

In the present invention, the ultra-high molecular weight polyolefin (A) may be used within the above range depending on the molding method.
And the content ratio of the polyolefin (B) can be adjusted. For example, when the ultrahigh molecular weight polyolefin composition is used for injection molding, the total amount of the ultrahigh molecular weight polyolefin (A) and the polyolefin (B) is 10%.
25 to 10 parts by weight of the ultrahigh molecular weight polyolefin (A) and 75 to 90 parts by weight of the polyolefin (B) based on 0 parts by weight.
It is preferable to use an ultrahigh molecular weight polyolefin composition which is present in a proportion of parts by weight, since moldability and good appearance can be obtained. When the ultrahigh molecular weight polyolefin composition is used for extrusion molding, the total amount of the ultrahigh molecular weight polyolefin (A) and the polyolefin (B) is 10%.
80 to 15 parts by weight of the ultrahigh molecular weight polyolefin (A) and 20 to 85 parts by weight of the polyolefin (B) based on 0 parts by weight.
It is preferable to use an ultrahigh molecular weight polyolefin composition which is present in a proportion of parts by weight, since moldability and good appearance can be obtained.

In the ultrahigh molecular weight polyolefin composition used in the present invention, the ultrahigh molecular weight polyolefin (A)
And / or the unsaturated carboxylic acid as the modifying monomer (C) for modifying the polyolefin (B) includes:
Specifically, acrylic acid, methacrylic acid, maleic acid,
Fumaric acid, itaconic acid, citraconic acid, crotonic acid, endocis-bicyclo [2,2,1] hept-5-ene-2,3-dicarboxylic acid (Nadic acid ^™ ) and the like.

The derivatives thereof include acid halides,
Esters, amides, imides, anhydrides and the like, specifically, maleenyl chloride, maleimide, acrylamide, methacrylamide, glycidyl methacrylate,
Maleic anhydride, citraconic anhydride, monomethyl maleate, dimethyl maleate, glycidyl maleate and the like can be mentioned. These modifying monomers (C) may be used alone or in combination of two or more. Among these, maleic anhydride is preferred because it is possible to obtain a molded article having high reactivity and good strength and appearance.

The ultrahigh molecular weight polyolefin composition used in the present invention comprises a composition containing the above ultrahigh molecular weight polyolefin (A) and polyolefin (B). In this composition, the ultrahigh molecular weight polyolefin (A) And / or the polyolefin (B) is modified with at least one modifying monomer (C) selected from unsaturated carboxylic acids and derivatives thereof.

The method for preparing such an ultrahigh molecular weight polyolefin composition includes the following method. (1) A method in which one or both of the ultrahigh molecular weight polyolefin (A) and the polyolefin (B) are modified with the modifying monomer (C), and then both are mixed at the above content ratio.

(2) A method in which the ultrahigh molecular weight polyolefin (A) and the polyolefin (B) are mixed and then this mixture is modified with the modifying monomer (C). (3) At the time of polymerization of the olefin, after performing a multi-stage polymerization using a specific Ziegler-type catalyst to produce a mixture containing the ultra-high-molecular-weight polyolefin (A) and the polyolefin (B) in the above content ratio, the mixture is modified. A method of modifying with a monomer (C) for use.

The method of preparing a mixture containing the ultra-high molecular weight polyolefin (A) and the polyolefin (B) by the above-mentioned multi-stage polymerization is carried out by using a highly active solid titanium catalyst component (a) containing magnesium, titanium and halogen as essential components. )
And a multistage polymerization of olefins in the presence of a Ziegler-type catalyst formed from the organoaluminum compound catalyst component (b). For example, first, in one polymerization step, the olefin is polymerized to generate the ultrahigh molecular weight polyolefin (A), and in the other polymerization steps, the olefin is polymerized in the presence of hydrogen to obtain the polyolefin (B). By producing the above, a mixture containing the above ultrahigh molecular weight polyolefin (A) and polyolefin (B) can be obtained.

The Ziegler-type catalyst used in the multi-stage polymerization is a catalyst having a specific property basically composed of a solid titanium catalyst component and an organoaluminum compound catalyst component.

As the solid titanium catalyst component, for example, a highly active fine powder catalyst having a narrow particle size distribution, an average particle size of about 0.01 to 5 μm, and a form in which several microspheres are fixed. It is preferred to use components. The highly active fine powdered titanium catalyst component having such properties can be obtained, for example, by contacting a liquid state magnesium compound with a liquid state titanium compound in the solid titanium catalyst component described in JP-A-56-811. It can be manufactured by strictly adjusting the precipitation conditions when depositing the solid product. For example, in the method disclosed in JP-A-56-811, a hydrocarbon solution in which magnesium chloride and a higher alcohol are dissolved and titanium tetrachloride are mixed at a low temperature, and then the temperature is raised to about 50 to 100 ° C. To precipitate a solid product, magnesium chloride 1
The precipitation is carried out under a strong stirring condition while a small amount of about 0.01 to 0.2 mol of a monocarboxylic acid ester coexists with respect to the mol. If necessary, it may be washed with titanium tetrachloride. In this way, a solid catalyst component satisfying both the activity and the particle state can be obtained.

The catalyst component is, for example, about 1% titanium.
About 6% by weight, halogen / titanium (atomic ratio) is about 5 to 90, and magnesium / titanium (atomic ratio) is about 4 to
It is in the range of 50.

The slurry obtained by subjecting the slurry of the solid titanium catalyst component obtained as described above to a shearing treatment at a high speed has a narrow particle size distribution and an average particle size of usually 0.0%.
What consists of microspheres in the range of 1 to 5 μm, preferably 0.05 to 3 μm is also suitably used as a highly active fine powdered titanium catalyst component. As a method of the high-speed shearing treatment, for example, a method of treating a slurry of a solid titanium catalyst component in an inert gas atmosphere using a commercially available homomixer for an appropriate time is employed. At that time, in order to prevent a decrease in catalytic performance, a method in which an organoaluminum compound in an equimolar amount with titanium is added in advance may be adopted. Furthermore, a method of removing coarse particles from the slurry after the treatment with a sieve may be employed. By these methods, a highly active fine powdered titanium catalyst component having the above fine particle diameter can be obtained.

Using this highly active fine powdered titanium catalyst component and an organoaluminum compound catalyst component, if necessary, in combination with an electron donor, pentane, hexane, heptane,
In a hydrocarbon solvent such as kerosene, slurry polymerization of, for example, ethylene alone or a monomer mixture containing ethylene as a main component in at least two or more multi-stage polymerization steps under a temperature condition usually in the range of 0 to 100 ° C. By doing so, a mixture of ultra-high molecular weight polyethylene and polyethylene can be produced.

Specific examples of the organoaluminum compound catalyst component to be used include trialkylaluminums such as triethylaluminum and triisobutylaluminum; dialuminum chlorides such as diethylaluminum chloride and diisobutylaluminum chloride; alkyls such as ethylaluminum sesquichloride and the like. Aluminum sesquichloride and the like are used, and these are used alone or in combination of two or more.

In this multi-stage polymerization step, a multi-stage polymerization apparatus in which at least two or more polymerization tanks are usually connected in series is employed. For example, a two-stage polymerization method, a three-stage polymerization method,. ... An n-stage polymerization method is performed. Further, it is also possible to carry out a multi-stage polymerization method by a batch polymerization method in one polymerization tank. At least one of the multi-stage polymerization steps
It is necessary to produce a specific amount of ultrahigh molecular weight polyolefin in each polymerization tank. The polymerization step for producing the ultrahigh molecular weight polyolefin may be a first-stage polymerization step, an intermediate polymerization step, or may be two or more stages. . Producing the ultrahigh molecular weight polyolefin (A) in the first polymerization step is preferable from the viewpoint of the polymerization treatment operation and the control of the physical properties of the produced polyolefin. In this polymerization step, 15 to 40% by weight of the olefin polymerized in all the steps
To produce an ultrahigh molecular weight polyolefin (A) having a predetermined intrinsic viscosity [η]. Further, it is preferable to produce 18 to 37% by weight, particularly 21 to 35% by weight, of the monomer to be polymerized in the whole polymerization step to produce an ultrahigh molecular weight polyolefin (A) having a predetermined intrinsic viscosity.

In this multi-stage polymerization step, in the polymerization step for producing the ultrahigh molecular weight polyolefin (A), the polymerization is carried out in the presence of a specific Ziegler-type catalyst comprising the highly active titanium catalyst component and the organoaluminum catalyst component. . This polymerization can be carried out by a gas phase polymerization method or a liquid phase polymerization method. In any of the polymerization methods, in the polymerization step for producing the ultrahigh molecular weight polyolefin (A), the polymerization reaction is carried out in the presence of an inert medium, if necessary. For example, in the gas phase polymerization method,
If necessary, the reaction is carried out in the presence of a diluent comprising an inert medium. In the liquid phase polymerization method, the reaction is carried out in the presence of a solvent comprising an inert medium as necessary.

In the polymerization step for producing the ultrahigh molecular weight polyolefin (A), a highly active titanium catalyst component as a catalyst, for example, about 0.001 to 20 milligram atoms as titanium atoms per liter of a medium, especially about 0.005
It is preferred that the organoaluminum compound catalyst component be used in a proportion such that the Al / Ti (atomic ratio) is about 0.1-1000, especially about 1-500.
The temperature in the polymerization step for producing the ultrahigh molecular weight polyolefin (A) is generally in the range of about -20 to 120C, preferably about 0 to 100C, particularly preferably about 5 to 95C. Further, the pressure of the polymerization reaction may be within a pressure range in which liquid-phase polymerization or gas-phase polymerization can be performed at the above temperature, and for example, from atmospheric pressure to about 100 kg / cm ² , preferably from atmospheric pressure to
It is in the range of about 50 kg / cm ² . Further, the polymerization time may be set so that the total amount of the polymerized polyolefin is about 1000 g or more, preferably about 2000 g or more per 1 mg atom of titanium in the highly active titanium catalyst component. Further, in the polymerization step, in order to produce the ultrahigh molecular weight polyolefin (A), it is preferable to carry out the polymerization reaction in the absence of hydrogen. Furthermore, after conducting the polymerization reaction,
It is also possible to once isolate and store the polymer under an inert medium atmosphere.

As the inert medium used in the polymerization step for producing the ultrahigh molecular weight polyolefin (A), specifically, aliphatic hydrocarbons such as propane, butane, pentane, hexane, heptane, octane, decane, and kerosene. Hydrogen; alicyclic hydrocarbons such as cyclopentane and cyclohexane; aromatic hydrocarbons such as benzene, toluene and xylene; halogenated hydrocarbons such as dichloroethane, methylene chloride, chlorobenzene and the like.
These are used alone or in combination of two or more. Particularly, an aliphatic hydrocarbon is preferred. In the method of the present invention, in the polymerization step other than the polymerization step for producing the ultrahigh molecular weight polyolefin (A), the remaining monomer is subjected to a polymerization reaction in the presence of hydrogen to produce a low molecular weight polyolefin (B). Is generated. If the polymerization step for producing the ultrahigh molecular weight polyolefin (A) is the first polymerization step, the second and subsequent polymerization steps are performed in the low molecular weight polyolefin (B) production step performed in the presence of hydrogen. is there. When the step of polymerizing the low molecular weight polyolefin (B) is located after the step of forming the ultrahigh molecular weight polyolefin (A), the step of polymerizing the low molecular weight polyolefin (B) includes The reaction mixture containing (A) is supplied, and when the polymerization step of the low-molecular-weight polyolefin (B) is located before the polymerization step in which the ultra-high-molecular-weight polyolefin (A) is formed, the reaction mixture is formed in the previous stage. Low molecular weight polyolefin (B)
And the ultrahigh molecular weight polyolefin (A) are supplied, and in each case, the polymerization is continuously performed. At that time, the raw material monomer mixture and hydrogen are usually supplied to the polymerization step. When the polymerization step is a first-stage polymerization step, a catalyst comprising the highly active titanium catalyst component and the organoaluminum compound catalyst component is supplied, and when the polymerization step is a polymerization step of the second stage or later, Can use the catalyst contained in the polymerization reaction mixture produced in the previous step as it is, or if necessary, additionally replenish the above-mentioned highly active titanium catalyst component and / or organoaluminum compound catalyst component. Good.

The supply ratio of hydrogen in the polymerization steps other than the polymerization step for producing the ultrahigh molecular weight polyolefin (A) is as follows:
It is usually in the range of 0.01 to 50 mol, preferably 0.05 to 30 mol, per 1 mol of the monomer supplied to the polymerization step.

The concentration of each catalyst component in the polymerization reaction mixture in the polymerization tank in a polymerization step other than the polymerization step for the production of the ultrahigh molecular weight polyolefin (A) was determined by converting the treated catalyst to titanium atom per liter of polymerization volume. Converted to about 0.
001 to 0.1 milligram atoms, preferably about 0.00
5 to 0.1 milligram atoms, polymerized Al / Ti
(Atomic ratio) is about 1 to 1000, preferably about 2 to 500
It is preferable to adjust so that If necessary, an organoaluminum compound catalyst component may be additionally used. In the polymerization system, a hydrogen / electron donor, a halogenated hydrocarbon, or the like may be additionally used in order to adjust the molecular weight, the molecular weight distribution, and the like.

The polymerization temperature is a temperature range in which slurry polymerization and gas phase polymerization are possible, and is about 40 ° C. or higher, more preferably about 50 to 100 ° C. The polymerization pressure is, for example, from atmospheric pressure to about 100 kg / cm ² , especially from atmospheric pressure to about 5 kg / cm ² .
A range of 0 kg / cm ² is recommended. The polymerization time is preferably set so that the amount of the polymer produced is about 1000 g or more, particularly preferably about 5000 g or more, per 1 mg atom of titanium in the titanium catalyst component.

The polymerization steps other than the polymerization step for producing the ultrahigh molecular weight polyolefin (A) can be similarly carried out by a gas phase polymerization method or a liquid phase polymerization method.
Of course, different polymerization methods may be employed in each polymerization step. Among the liquid phase polymerization methods, a slurry suspension polymerization method is suitably employed. In any case, in the polymerization step, the polymerization reaction is usually carried out in the presence of an inert medium. For example, the gas phase polymerization method is carried out in the presence of an inert medium diluent, and the liquid phase slurry suspension polymerization method is carried out in the presence of an inert medium solvent. As the inert medium, the same inert medium as that exemplified in the polymerization step for producing the ultrahigh molecular weight polyolefin (A) can be exemplified.

The intrinsic viscosity [η] c of the mixture of the ultrahigh molecular weight polyolefin (A) and the polyolefin (B) obtained in the final polymerization step is usually 3.5 to 15 dl /
g, preferably 4.0 to 10 dl / g, and the melting torque is:
Usually, it is 4.5 kg · cm or less.

The multi-stage polymerization can be carried out in any of a batch system, a semi-continuous system and a continuous system.
As a method for modifying the composition containing the ultrahigh molecular weight polyolefin (A) and / or the polyolefin (B), or both components with the modifying monomer (C), various conventionally known methods can be adopted. For example, the ultra-high molecular weight polyolefin (A) and / or the polyolefin (B), or a composition containing both components is suspended or dissolved in a solvent, and usually, at a temperature of 80 to 200 ° C., a single monomer for modification is used. A method of adding and mixing a polymer and a radical polymerization initiator to carry out graft copolymerization, or a method of melting point or more, for example, 180
A method in which the modifying monomer (C) and the radical polymerization initiator are brought into contact with each other at a temperature of from about 300 ° C to about 300 ° C under melt-kneading.

Specific examples of the solvent used include aromatic hydrocarbon solvents such as toluene and xylene; aliphatic hydrocarbon solvents such as hexane, heptane, octane and decane; alicyclic solvents such as cyclohexane and methylcyclohexane. Aliphatic hydrocarbon solvents such as trichloroethylene, perchloroethylene, dichloroethylene, dichloroethane, and chlorobenzene; aliphatic alcohol solvents such as ethanol and isopropanol; ketone solvents such as acetone, methyl isobutyl ketone, and methyl ethyl ketone; Examples include ester solvents such as methyl acetate, ethyl acetate, and butyl acetate. These solvents may be used alone or in combination of two or more.

Examples of the radical polymerization initiator include radical initiators such as organic peroxides and azo compounds. Specific examples of the organic peroxide include benzoyl peroxide, 2,4-dichlorobenzoyl peroxide, m-trioil peroxide, di-t-butyl peroxide, dicumyl peroxide, (2,5- Dimethyl-
2,5-bis (t-butylperoxy) hexane, 2,5-dimethyl-2,5-bis (t-butylperoxy) hexyne-3, lauroyl peroxide, t-butylperoxyacetate, 2,5 -Dimethyl-2,5-di (benzoylperoxy) hexane, t-butylperoxybenzoate, t-butylperoxyisobutyrate, t-butylperoxyphenyl acetate, t-butylperoxy-s-octate, t -Butylperoxypivalate, cumylperoxypivalate, t-butylperoxyethyl acetate and the like.

Specific examples of the azo compound include azoisobutyronitrile, dimethylazoisobutyrate and the like. These radical initiators are used alone or in combination of two or more.

In the ultrahigh molecular weight polyolefin composition used in the present invention, the grafting amount of the modifying monomer (C) is based on 100% by weight of the total amount of the ultrahigh molecular weight polyolefin (A) and the polyolefin (B). 0.2 ~
The ratio is preferably 2.0% by weight, particularly 0.7 to
Preferably, the proportion is 1.3% by weight.

In the present invention, a filler and a coloring agent are added to the ultrahigh molecular weight polyolefin composition in the same manner as in the case of the above-mentioned polyolefin thermoplastic elastomer.
It can be included in a range that does not impair the object of the present invention.

Further, in the present invention, the phenolic, sulfite, phenylalkane, phosphite,
A known heat stabilizer such as an amine stabilizer; an antioxidant;
Additives such as weathering stabilizers; antistatic agents; lubricants such as metal soaps and waxes can be included in proportions normally used in the production of olefin plastics or olefin copolymer rubbers.

In the present invention, the ultrahigh molecular weight polyolefin composition is used in an amount of 2 to 90 parts by weight based on 100 parts by weight of the total amount of the ultrahigh molecular weight polyolefin composition and the lubricating resin constituting the lubricating resin layer 5. It is preferably used in a proportion of 3 to 70 parts by weight, more preferably 5 to 50 parts by weight.

By blending the ultrahigh molecular weight polyolefin composition in the above ratio in the lubricating resin, the sliding characteristics of the lubricating resin can be improved. Slippery Resin In the present invention, examples of the slippery resin constituting the slippery resin layer 5 together with the ultrahigh molecular weight polyolefin composition include a polyamide resin, a thermoplastic polyurethane resin and a thermoplastic polyester resin.

Examples of the polyamide resin include various nylons such as 6-nylon and 6,6-nylon. Further, as the thermoplastic polyurethane resin, a resin excellent in water resistance, oil resistance and scratch resistance is preferable. Any polyurethane resin which is thermoplastic and excellent in the above-mentioned properties can be used as the slip resin constituting the slip resin layer 5 of the present invention.

The thermoplastic polyester resin includes:
Specifically, polyethylene terephthalate (PET),
Examples thereof include polybutylene terephthalate (PBT) and polyethylene isophthalate (PEI).

In the present invention, the lubricating resin is 98 to 10 parts by weight, preferably 97 to 97 parts by weight, based on 100 parts by weight of the total amount of the ultrahigh molecular weight polyolefin composition and the lubricating resin constituting the lubricating resin layer 5. To 30 parts by weight, more preferably 95 to 50 parts by weight.

The thickness of the lubricating resin layer 5 is usually 1
The layers are laminated so as to have a thickness of 0 to 200 μm. In the present invention, if necessary, the thickness of the lubricating resin layer 5 can be further increased or reduced.

Since the portion where the sliding contact member 3 comes into contact with the window glass 7 is generally different between when the window glass 7 is raised and when it is lowered, it is possible to cover the window glass 7 with a mixture of an ultrahigh molecular weight polyolefin composition and a lubricating resin. It is preferable that the raised material to be formed as necessary is formed in a relatively wide range of the sliding contact member 3.

[0089]

According to the present invention, the step of applying the adhesive and the step of curing or baking the adhesive can be omitted, and as a result, the number of steps can be reduced and the working time can be shortened. In addition to being able to produce economical automotive weatherstrips, heat resistance, durability, close contact with the window glass when closed, and light sliding when lifting and lowering the window glass Thus, it is possible to provide a weatherstrip for an automobile which is excellent in quality.

Hereinafter, the present invention will be described with reference to Examples.
The present invention is not limited to these examples.

[0091]

[Example 1] Ethylene propylene 5-ethylidene-2-
Norbornene copolymer rubber [ethylene content 70 mol%, iodine value 12, Mooney viscosity ML _{1 + 4} (100 ° C.)
120] 75 parts by weight and polypropylene [MFR13g
/ 10 min (ASTM D 1238-65T, 230
C.) and a density of 0.91 g / cm ³ ] and 25 parts by weight in a nitrogen atmosphere at 180 ° C. for 5 minutes using a Banbury mixer. It was cut to produce square pellets.

To the square pellets, add maleic anhydride 0.5
Parts by weight, 0.5 parts by weight of divinylbenzene, and 0.3 parts by weight of 1,3-bis (t-butylperoxyisopropyl) benzene were added and mixed with a Henschel mixer.

Next, this mixture was extruded at a temperature of 220 ° C. under a nitrogen atmosphere using a single screw extruder having an L / D of 30 and a screw diameter of 50 mm to obtain pellets of a modified polyolefin-based thermoplastic elastomer.

The gel content of the resulting modified polyolefin-based thermoplastic elastomer was 97% by weight as determined by the above method. Pellets of this modified polyolefin-based thermoplastic elastomer, 25% by weight of ultrahigh molecular weight polyethylene having an intrinsic viscosity [η] of 21 dl / g measured at 135 ° C. in decalin solvent, and intrinsic viscosity [η] measured at 135 ° C. in decalin solvent Is an ultra-high molecular weight polyethylene composition consisting of 75 dl / g of 1.5 dl / g low molecular weight polyethylene [maleic anhydride content: 1% by weight, 13% by weight
Intrinsic viscosity [η] measured in decalin solvent at 5 ° C: 6.4
dl / g, density: 0.965 g / cm ³ ], and a mixture obtained by previously mixing 80 parts by weight of 6-nylon [trade name: Amilan CM-1007, manufactured by Toray Industries, Inc.] with a Henschel mixer. And filler-containing polypropylene [MFR: 2 g / 10 min, density: 1.14 g / c
m ³ , containing 30% by weight of talc] at a temperature of 230 ° C. to form a polypropylene core material containing filler, a modified polyolefin-based thermoplastic elastomer layer as a substrate layer, and a slipping resin layer as a surface material layer. Thus, an automotive weather strip as shown in FIG. 1 was obtained.

The obtained automobile weatherstrip is:
A core material having a thickness of 2 mm, a width of 25 mm, and a length of 700 mm, a modified polyolefin-based thermoplastic elastomer layer having a thickness of 2.5 mm, a width of 20 mm, and a length of 700 mm, and a thickness of 50 μm
m, a width of 20 mm, and a length of 700 mm.

The weather strip for automobiles obtained was mounted on a test window frame, fitted with a 3.2 mm-thick window glass, and a durability test (up-and-down repetition test of the window glass) was performed. As a result, the weatherstrip for automobiles was 50,000
It survived the zero-time repetition test of the window glass and maintained its function as a weatherstrip. However, the conventional automotive weatherstrip (the sliding member has a laminated structure in which a nylon film is adhered to a soft vinyl chloride layer) causes the nylon film to break at the window glass contact surface in 25,000 times, As a result, the frictional resistance with the window glass increased remarkably, and it became impossible to withstand use.

[0097]

Example 2 In Example 1, a polyurethane resin [Nihon Polyurethane Industry Co., Ltd.] was used instead of 6-nylon.
Manufactured by Polyurethane P26SRNAT].
Performed in the same manner as in Example 1. The resulting automotive weatherstrip withstood 50,000 up / down repetitions of the window glass.

[0098]

Example 3 In Example 1, a polyethylene terephthalate resin having an intrinsic viscosity [η] of 1.0 dl / g measured in an orthochlorophenol solution at 25 ° C. was used in place of 6-nylon. Performed in a similar manner to 1. The resulting automotive weatherstrip withstood 50,000 up / down repetitions of the window glass.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an automotive weatherstrip according to the present invention.

FIG. 2 is a view illustrating a place where the weather strip for an automobile shown in FIG. 1 is attached to an automobile door.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Weather strip for automobiles 2 ... Core material 3 ... Sliding member 4 ... Modified polyolefin-based thermoplastic elastomer layer 5 ... Slip resin layer 7 ・ ・ ・ ・ ・ ・ ・ Window glass

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI B32B 27/34 B32B 27/34 27/40 27/40 F16J 15/10 F16J 15/10 X // C08L 23/04 C08L 23 / 04 (C10M 107/00 107: 32 107: 44 107: 04) C10N 40:02 50:08 (58) Field surveyed (Int.Cl. ⁶ , DB name) C10M 107/00-107/44 B32B 7 / 02 B32B 25/08 B32B 27/08-27/40 F16J 15/10 C08L 23/04 C10N 40:02 C10N 50:08 WPI / L (QUESTEL)

Claims (1)

(57) [Claims] 1. A weather strip for automobiles comprising a thin plate-shaped core member made of a polyolefin resin and a sliding contact member provided on the surface of the core member, wherein at least a window glass of the sliding contact member is provided. The part which can be contacted comprises a lubricating resin layer comprising an ultrahigh molecular weight polyolefin composition and a lubricating resin laminated on the modified polyolefin-based thermoplastic elastomer layer, wherein the ultrahigh molecular weight polyolefin composition comprises: From a composition comprising 90 to 10 parts by weight of an ultrahigh molecular weight polyolefin having a viscosity [η] of 6 dl / g or more, and (B) 10 to 90 parts by weight of a polyolefin having an intrinsic viscosity [η] of 0.1 to 5 dl / g. And the ultrahigh molecular weight polyolefin (A) and / or polyolefin (B) is at least one member selected from unsaturated carboxylic acids and derivatives thereof. An ultrahigh molecular weight polyolefin composition modified with a sex monomer (C), wherein the slipping resin is a slipping resin selected from the group consisting of a polyamide resin, a thermoplastic polyurethane resin and a thermoplastic polyester resin. An automotive weatherstrip, characterized in that: