JP3210066B2 - Glass run channel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass run channel, and more particularly, to a glass run channel provided with a window glass sliding portion composed of a laminate comprising a thermoplastic elastomer base layer and a lubricating resin surface layer. About the channel.

[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. A glass run channel is provided between the window glass and the window frame in order to facilitate the operation of raising and lowering the window glass and to enable a tight (liquid-tight) sealing operation between the window glass and the window frame. A guide member is provided.

A conventional glass run channel has a groove-shaped main body in a cross section 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. It consists of a tongue-shaped draining part protruding from the vicinity of the side wall top toward the center.

In the conventional glass run channel, a nylon film or the like is adhered to the surface of the sliding portion of the window glass by bonding in order to make the window glass away from the draining portion and to prevent the window glass from being stained. In order to reduce the contact area with the window glass, embossing is performed before or after lamination of the nylon film or the like.

In such a glass run channel, since there is no adhesiveness between the above-mentioned soft synthetic resin or vulcanized rubber and a surface material such as nylon, the main body of the glass run channel is made of a soft synthetic resin or vulcanized rubber. It is necessary to perform a process of forming, applying an adhesive to the obtained molded product and bonding a film such as nylon, and furthermore, embossing must be performed before or after this bonding. In addition, there is an inconvenience that it takes time and effort.

In addition, such a glass run channel has a problem in durability due to the lamination step using an adhesive, and is liable to peel off between the surface film layer and the substrate due to aging or exposure to the outdoors. There is also a disadvantage.
Furthermore, the concavo-convex pattern that can be formed by embossing is not yet sufficiently satisfactory in combination with fineness and uniformity, and the close contact between the sliding part of the windowpane and the windowpane when closed, and when opened. There is still room for improvement in the light sliding property between the window glass sliding portion and the window glass.

Accordingly, the present inventors have made intensive studies to solve the above-mentioned problems of the glass run channel, and have made use of crystalline polyolefin and rubber as an elastomer constituting at least the sliding portion of the window glass of the glass run channel. If the thermoplastic elastomer to be composed is selected, and a specific ultra-high molecular weight polyolefin composition layer is laminated on the thermoplastic elastomer layer by heat-sealing, the manufacturing operation is easy, and the durability and closing time The present inventors have found that a glass run channel excellent in close contact with a window glass at the time of opening and excellent slidability with the window glass at the time of opening can be obtained, and the present invention has been completed.

[0008]

SUMMARY OF THE INVENTION The object of the present invention is to solve the problems associated with the prior art as described above. It is an object of the present invention to provide a glass run channel which is excellent in close contact with a glass and light sliding property with a window glass when opened.

[0009]

SUMMARY OF THE INVENTION A glass run channel according to the present invention comprises:
A glass run channel comprising a groove-shaped main body in a cross section and a tongue-shaped drainage portion protruding from the vicinity of the side wall top toward the center, and a contact portion of the glass run channel with a window glass. Is a thermoplastic elastomer composed of crystalline polyolefin and rubber (A)
And an ultrahigh molecular weight polyolefin composition (B) layer, and the ultrahigh molecular weight polyolefin composition (B) layer is configured to be in contact with the window glass. B) consists essentially of the ultrahigh molecular weight polyolefin having an intrinsic viscosity [η] in the range of 5 to 40 dl / g measured in a decalin solvent at 135 ° C. and the thermoplastic elastomer (A), The molecular weight polyolefin is present in a proportion of 15 to 40% by weight based on 100% by weight of the total weight of the ultrahigh molecular weight polyolefin and the thermoplastic elastomer (A), and the melt flow of the ultrahigh molecular weight polyolefin composition (B) Rate (23
0 ° C., 2.16 kg load) is 5 g / 10 min or less.

The thermoplastic elastomer (A) preferably used in the present invention includes the following partially crosslinked polyolefin-based thermoplastic elastomer. (1) Rubber made of crystalline polypropylene (a) 70 to 10 parts by weight and ethylene / propylene copolymer rubber or ethylene / propylene / diene copolymer rubber (b)
The rubber (b) obtained by dynamically heat-treating a mixture consisting of 30 to 90 parts by weight (the total amount of the components (a) and (b) is 100 parts by weight) in the presence of an organic peroxide. ) Is a partially crosslinked thermoplastic elastomer.

Such a thermoplastic elastomer (A)
Is used as a component of the thermoplastic elastomer (A) layer and as a component of the ultrahigh molecular weight polyolefin composition (B). In the present invention, from the viewpoint of interlayer adhesion, it is preferable to use the same thermoplastic elastomer (A) for both.

[0012]

DETAILED DESCRIPTION OF THE INVENTION Hereinafter, an example of a glass run channel according to the present invention will be specifically described with reference to the drawings.

In FIG. 1 showing a cross-sectional structure of an example of the glass run channel of the present invention, the glass run channel 1 has a groove-shaped (U-shaped) main body 2 in a cross section and a center from the vicinity of the side wall top. And a tongue-shaped drainer 3 protruding toward the side. The pair of drainers 3 and 3 extend inclining toward the inside of the groove of the main body 2, and the outer surface side is a window glass contact part 4, and the tips 5 and 5 can be opened and closed with each other. Is in a good positional relationship. The main body 2 is provided with a hook 6 for attachment to a window frame on an outer wall thereof.

Although the main body 2 and the draining part 3 are integrally formed of an elastomer, according to the present invention, at least the window glass contact part 4 is formed with a base layer made of a specific thermoplastic elastomer (A) and a specific layer. And a lubricating resin layer comprising the ultrahigh molecular weight polyolefin composition (B). As shown in FIG. 2 showing the window glass contact portion 4 in an enlarged manner, it is preferable that the surface 8 of the base layer 7 made of the thermoplastic elastomer (A) has a repetitive pattern of fine irregularities.
The ultrahigh molecular weight polyolefin composition (B) is applied to the surface 8 having such a sharkskin-like fine uneven pattern.
It is preferable that a lubricating resin layer 9 made of is laminated by thermal fusion, and the outer surface 10 is provided with a similar repetitive pattern of fine irregularities.

Referring to FIGS. 3, 4 and 5 for explaining the attachment of the glass run channel to an automobile, FIG.
The vehicle door 11 is provided with a window glass 12 that can be opened and closed by elevating and lowering, while the glass run channel 1 is fixed to a window frame 13. That is, in FIGS. 4 and 5, the window frame 13 has a U-shaped cross section as a whole, and an inward projection 15 is formed at the entrance of the concave portion 14. The glass run channel 1 is fixed to the window frame 13 by inserting the glass run channel 1 into the concave portion 14 and engaging the engaging hook 6 with the projection 15. As shown in FIG. 4, when the window glass 12 is lowered, the tips 5, 5 of the glass sliding parts face each other and are closed, and as shown in FIG. In the figure, the tips 5, 5 of the window glass sliding portions are separated by the window glass 12 inserted between them, but are in contact with the window glass surface.

According to the present invention, the glass run channel 1
A base layer 7 made of a thermoplastic elastomer (A) at least in a portion in contact with a window glass; and a lubricating resin consisting of an ultra-high molecular weight polyolefin composition (B) thermally fused to the surface of the base layer 7. And a layer 9.

That is, the thermoplastic elastomer (A) used in the present invention can be thermoformed into an arbitrary shape and dimensions, and has elasticity and flexibility required for a sliding portion of a window glass of a glass run channel. It has excellent properties such as heat resistance and compressibility, and also has excellent properties such as durability, weather resistance and water resistance. The thermoplastic elastomer (A) exhibits strong adhesion to the lubricating resin layer 9 made of the ultrahigh molecular weight polyolefin composition (B) to be the surface material layer, and is thermally fused to the lubricating resin layer 9. Thus, it is possible to form a laminated structure excellent in the interlayer adhesive strength immediately after the bonding and over time, and further, the interlayer adhesive strength after the weather resistance test.
Moreover, the thermoplastic elastomer (A) used as the base layer 7 in the present invention can be molded so as to exhibit a sharkskin-like molded appearance. This molding step and the ultra-high molecular weight as the surface material layer By combining the step of heat-sealing the lubricating resin layer 9 made of the polyolefin composition (B) and the base layer 7, the sharkskin-like fine unevenness pattern is faithfully reproduced on the outer surface of the lubricating resin layer 9. You can also. It is extremely difficult to project such a sharkskin-shaped surface with a microscopic unevenness by a conventional adhesive application method, and it has become possible only by combining the above-mentioned molding step and heat fusion step.

According to the present invention, by employing the above-described structure, the step of applying the adhesive, the step of curing or baking the adhesive, and the step of embossing before or after the step are all omitted, and the number of steps is small and the number of steps is small. A glass run channel can be efficiently manufactured with a lot of trouble. In addition, by providing the lubricating resin layer 9 made of the ultrahigh molecular weight polyolefin composition (B) as a surface material layer, not only can the coefficient of friction with the window glass be reduced, but also the concavo-convex In comparison with the above, it became possible to form fine sharkskin-like irregularities on the surface with a uniform pitch. Therefore, in the glass run channel according to the present invention, when the window glass is closed, close (liquid-tight) contact with the window glass is possible, and when the window glass is opened, the sliding resistance is reduced, so that the glass run channel is smooth and light. Opening and closing operations are possible.

Thermoplastic Elastomer (A) The thermoplastic elastomer (A) used in the present invention comprises a crystalline polyolefin and a rubber.

The crystalline polyolefin used in the present invention includes a homopolymer or copolymer of an α-olefin having 2 to 20 carbon atoms. Specific examples of the crystalline polyolefin include the following (co) polymers. (1) Ethylene homopolymer (The production method may be either a low-pressure method or a high-pressure method.) (2) Copolymerization of ethylene with 10 mol% or less of other α-olefins or vinyl monomers such as vinyl acetate and ethyl acrylate. Polymer (3) Propylene homopolymer (4) Random copolymer of propylene and 10% or less of other α-olefin (5) Block copolymer of propylene and 30% or less of other α-olefin (6) 1-butene homopolymer (7) Random copolymer of 1-butene and 10% by mole or less of other α-olefin (8) 4-methyl-1-pentene homopolymer (9) 4 -Methyl-1-pentene and less than 20 mol% of other α
-Random copolymer with olefin As the α-olefin, specifically, ethylene, propylene, 1-butene, 4-methyl-1-pentene, 1-
Hexene, 1-octene and the like.

The rubber used in the present invention is not particularly limited, but an olefin copolymer rubber is preferred. The olefin-based copolymer rubber has 2 to 20 carbon atoms.
Amorphous random elastic copolymer containing α-olefin as a main component, which is an amorphous α-olefin copolymer composed of two or more α-olefins and non-conjugated with two or more α-olefins Α-olefin / non-conjugated diene copolymer comprising diene.

Specific examples of such an olefin copolymer rubber include the following rubbers. (1) Ethylene / α-olefin copolymer rubber [ethylene / α-olefin (molar ratio) = about 90/10
50/50] (2) Ethylene / α-olefin / non-conjugated diene copolymer rubber [Ethylene / α-olefin (molar ratio) = about 90/10
５０50/50] (3) Propylene / α-olefin copolymer rubber [propylene / α-olefin (molar ratio) = about 90/1
0-50 / 50] (4) Butene / α-olefin copolymer rubber [butene / α-olefin (molar ratio) = about 90/10
50/50] Specific examples of the α-olefin include the same α-olefins as the specific examples of the α-olefin constituting the crystalline polyolefin described above.

As the non-conjugated diene, specifically,
Examples thereof include dicyclopentadiene, 1,4-hexadiene, cyclooctadiene, methylene norbornene, and ethylidene norbornene.

Mooney viscosity ML of these copolymer rubbers
_{1 + 4} (100 ° C.) is from 10 to 250, especially from 40 to 150
Is preferred. The iodine value when the non-conjugated diene is copolymerized is preferably 25 or less.

The above-mentioned olefin-based copolymer rubber can exist in the thermoplastic elastomer in all cross-linked states such as uncross-linked, partially cross-linked, and totally cross-linked. Preferably it is present.

The rubber used in the present invention includes:
In addition to the above olefin copolymer rubber, other rubber,
For example, styrene-butadiene rubber (SBR), nitrile rubber (NBR), natural rubber (NR), butyl rubber (I
IR) and the like, diene rubbers, SEBS, polyisobutylene and the like.

In the thermoplastic elastomer used in the present invention, the weight ratio of the crystalline polyolefin to the rubber (crystalline polyolefin / rubber) is usually 90/10 to 10/10.
The range is 5/95, preferably 70/30 to 10/90.

When an olefin copolymer rubber and another rubber are used in combination as the rubber, the other rubber has a total amount of crystalline polyolefin and rubber of 1%.
40 parts by weight or less, preferably 5 to 100 parts by weight
It is blended at a ratio of 20 parts by weight.

The thermoplastic elastomer preferably used in the present invention comprises crystalline polypropylene and ethylene / α-
It consists of an olefin copolymer rubber or an ethylene / α-olefin / non-conjugated diene copolymer rubber, exists in a thermoplastic elastomer in a partially cross-linked state, and has a weight blend of crystalline polypropylene and rubber. The ratio (crystalline polypropylene / rubber) is 70 / 30-1
It is in the range of 0/90.

If necessary, additives such as mineral oil-based softeners, heat stabilizers, antistatic agents, weather stabilizers, antioxidants, fillers, coloring agents, lubricants and the like may be added to the thermoplastic elastomer. Can be blended within a range that does not impair the object of the present invention.

More specific examples of the thermoplastic elastomer preferably used in the present invention include: 60 to 10 parts by weight of a crystalline polypropylene (a), an ethylene / propylene copolymer rubber or an ethylene / propylene / diene copolymer. 40 to 90 parts by weight of rubber (b) made of rubber [total amount of components (a) and (b) is 100 parts by weight]
And a rubber (c) other than the rubber (b) and / or 5-100 parts by weight of a mineral oil-based softener (d), which is dynamically heat-treated in the presence of an organic peroxide to obtain a mixture. A thermoplastic elastomer obtained by partially cross-linking the rubber (b) is exemplified.

Specific examples of the 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 an amount of 0.05 to 3% by weight, preferably 0.1 to 1% by weight, based on 100% by weight of the total amount of the crystalline polyolefin and the rubber.

In the partial crosslinking treatment with the above organic peroxide, sulfur, p-quinonedioxime, p, p'-dibenzoylquinonedioxime, N-methyl-N-4-dinitrosoaniline, nitrosobenzene, diphenylguanidine, triphenyl Peroxy crosslinking aids such as methylolpropane-N, N'-m-phenylenedimaleimide, or divinylbenzene, triallyl cyanurate, ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, trimethylolpropane trimethacrylate , Polyfunctional methacrylate monomers such as allyl methacrylate, and polyfunctional vinyl monomers such as vinyl butyrate and vinyl stearate.

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 crystalline polyolefin and rubber, which are the main components of the above-mentioned crosslinked product, and has an action of solubilizing the organic peroxide. Therefore, a thermoplastic elastomer having a uniform cross-linking effect by heat treatment and a good balance between fluidity and physical properties can be obtained.

The cross-linking aid or polyfunctional vinyl monomer as described above is used for the whole of the above-mentioned object to be cross-linked.
It is preferably used in a proportion of 0.1 to 2% by weight, particularly 0.3 to 1% by weight. If the compounding ratio of the crosslinking aid 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 obtained thermoplastic elastomer has poor fluidity. On the other hand, when the blending amount of the organic peroxide is small, the crosslinking aid and the polyfunctional vinyl monomer remain as unreacted monomers in the thermoplastic elastomer, and the thermoplastic elastomer becomes hot during processing and molding. Changes in physical properties due to history may occur. 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 performed 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 170
To 240 ° C., and the kneading time is 1 to 20 minutes, preferably 3 to 10 minutes. The applied shear force is
The shear rate is 10 sec ^-1 or more, preferably 100 to
It is determined within the range of 10,000 sec ^-1 .

The preferred thermoplastic elastomer used in the present invention is partially crosslinked, and the term "partially crosslinked" refers to a gel having a gel content of 20 to 98% as measured by the following method. In the present invention, the gel content is preferably in the range of 40 to 98%.

[Measurement Method of Gel Content] As a sample, about 100 mg of a pellet of a thermoplastic elastomer is weighed, and 30 ml which is a sufficient amount for the pellet is placed in a closed container.
In cyclohexane at 23 ° C. for 48 hours.

Next, this sample is taken out on a filter paper and dried at room temperature for 72 hours or more 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 thermoplastic elastomer (A) constituting one layer of the thermoplastic elastomer laminate according to the present invention is composed of crystalline polyolefin and rubber, and thus has excellent fluidity.

The above-mentioned polyolefin-based thermoplastic elastomer can be molded using a conventionally used molding apparatus such as compression molding, transfer molding, injection molding, and extrusion molding.

[0044] Specific examples of ultra high molecular weight polyolefin composition (B) ultra high molecular weight polyolefin composition (B) used in the present invention include the ultra-high molecular weight polyolefin composition as follows.

(1) The intrinsic viscosity [η] measured in a decalin solvent at 135 ° C. is 5 to 40 dl / g, preferably 15 to 40 dl / g.
Consisting essentially of an ultra-high molecular weight polyolefin in the range of 35 dl / g and a thermoplastic elastomer (A),
The ultrahigh molecular weight polyolefin is present in a proportion of 15 to 40% by weight based on 100% by weight of the total weight of the ultrahigh molecular weight polyolefin and the thermoplastic elastomer (A), and the melt flow rate of the ultrahigh molecular weight polyolefin composition (Based on MFR, ASTM D 1238, 230 ° C,
2.16 kg load) is 5 g / 10 min or less, preferably 1
g / 10 minutes or less, more preferably 0.2 g / 10 minutes or less.

(2) A composition comprising the ultrahigh molecular weight polyolefin composition of (1) and a liquid or solid lubricating oil of 1 to 20% by weight based on the ultrahigh molecular weight polyolefin composition.

The ultrahigh molecular weight polyolefin as described above includes, for example, ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 1-dodecene, 4-methyl-1-pentene, It consists of a homopolymer or copolymer of α-olefin such as 3-methyl-1-pentene. 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 thermoplastic elastomer (A) constituting these ultrahigh molecular weight polyolefin compositions is the same as the thermoplastic elastomer (A) described above, and is composed of crystalline polyolefin and rubber.

As the liquid lubricating oil used in the composition (2), petroleum lubricating oil, synthetic lubricating oil and the like are used. Specific examples of the petroleum-based lubricating oil include liquid paraffin, spindle oil, refrigerating machine oil, dynamo oil, turbine oil, machine oil, cylinder oil, and the like.

Specific examples of the synthetic lubricating oil include synthetic hydrocarbon oil, polyglycol oil, polyphenyl ether oil, ester oil, phosphate ester oil, polychlorotrifluoroethylene oil, fluoroester oil, chlorinated biphenyl oil. Oil, silicone oil and the like are used.

As the solid lubricating oil used in the composition (2), specifically, graphite and molybdenum disulfide are mainly used. In addition, boron nitride, tungsten disulfide and lead oxide are used. , Glass powder, metal soap, etc. can also be used. The solid lubricating oil can be used alone or in combination with a liquid lubricating oil. For example, the solid lubricating oil can be blended with the ultrahigh molecular weight polyolefin in the form of a powder, a sol, a gel, a suspensoid or the like.

The above ultrahigh molecular weight polyolefin composition may contain, if necessary, mineral oil softeners, heat stabilizers, antistatic agents, weathering stabilizers, antioxidants, fillers, coloring agents, lubricants and the like. Additives can be incorporated within a range that does not impair the purpose of the present invention.

The ultra-high molecular weight polyolefin compositions of the above (1) and (2) are
It can be obtained by dynamically heat-treating the thermoplastic elastomer (A) and the other components used as necessary. Here, “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 ultrahigh molecular weight polyolefin compositions (B) of the above (1) and (2) can be co-extruded and laminated with the thermoplastic elastomer (A), so that they can be used in the production of the glass run channel of the present invention. , Film (sheet)
The thermoplastic elastomer layer and the ultrahigh molecular weight polyolefin composition layer can be directly laminated without a molding step, which is economical.

On the other hand, the ultrahigh molecular weight polyolefin, for example, the ultrahigh molecular weight polyolefin alone having an intrinsic viscosity [η] in the range of 5 to 40 dl / g measured in a decalin solvent at 135 ° C. in the above (1) alone, has the above thermoplastic property. Co-extrusion lamination with an elastomer cannot be performed. Therefore, at the time of laminating the above-mentioned thermoplastic elastomer layer and ultra-high molecular weight polyolefin layer, at least one of them must be formed into a film (sheet) in advance. The economic efficiency is inferior to the case of the ultrahigh molecular weight polyolefin composition.

In the glass run channel according to the present invention, the drainer 3 is preferably made of the same material as the main body 2. When the main body 2 is made of the thermoplastic elastomer (A), if the draining part 3 is also formed of the same material, it is sufficiently practical in terms of durability and bonding strength with the lubricating resin layer 9. Endure.

Shark skin (shark skin) that can be used in the glass run channel according to the present invention can be developed during molding by appropriately selecting the properties of the raw material thermoplastic elastomer (A).

The appearance of the obtained sharkskin is different from the melt fracture which may be observed at the time of extrusion molding of a resin or an elastomer, and the skin of the molded product is periodically roughened to produce fine irregularities.

Further, it is necessary that the sharkskin is exposed also on the surface of the slipping resin layer 9 provided on the sharkskin, and the thickness of the slipping resin layer 9 is usually 3 to 50 μm.
m. In the present invention, the thickness of the lubricating resin layer 9 can be further increased or reduced as necessary.

Since the portion where the drainer 3 comes into contact with the window glass 12 is generally different when the window glass 12 enters and exits, it is coated with the ultrahigh molecular weight polyolefin composition (B) and applied as necessary. The shark skin to be formed is preferably applied to a relatively wide range of the draining portion 3.

In the specific example shown in FIG. 1, there is a portion 16 in contact with the end of the window glass inside the main body 2, and this portion 16 is also provided on the surface of the main body 2 made of the thermoplastic elastomer (A). And an ultra-high molecular weight polyolefin composition (B)
Can be provided.

Further, in the present invention, a brush may be present on the surface of the lubricating resin layer 9. The method of decorating the brush is as follows: (a) a method of buffing with emery paper to decorate the surface of the lubricating resin layer, and (b) a needle cloth roll to pass through the surface of the lubricating resin layer. (C) sanding with a belt sander or drum sander to raise and decorate the surface of the slipping resin layer, and (d) thermal microscopic method described in JP-A-62-275732. A conventionally known raised decoration method such as a method of raising the surface of the slippery resin layer by colliding the body is used.

[0064]

According to the present invention, the step of applying the adhesive, the step of curing or baking the adhesive, and the steps of embossing before and after the step can be omitted. As a result, the number of steps can be reduced. In addition, since the working time can be shortened, a glass run channel having excellent economy can be manufactured, and durability, close contact with a window glass when closed, and light sliding during opening and closing operations can be achieved. A glass run channel having excellent properties can be provided.

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

[0066]

Example 1 Ethylene content 70 mol%, iodine value 1
2. 80 parts by weight of an ethylene / propylene / 5-ethylidene-2-norbornene copolymer rubber (hereinafter abbreviated as EPDM (1)) having a Mooney viscosity of ML _{1 + 4} (100 ° C.) 120;
MFR (ASTM D 1238-65T, 230 ° C)
13 g / 10 min, 20 parts by weight of polypropylene (hereinafter abbreviated as PP (1)) having a density of 0.91 g / cm ³ were mixed at a temperature of 180 ° C. in a nitrogen atmosphere at 180 ° C. using a Banbury mixer.
After kneading for minutes, the kneaded material was passed through a roll to form a sheet, which was cut with a sheet cutter to produce square pellets.

Next, this square pellet and 1,3-bis (t
0.3 parts by weight of tert-butylperoxyisopropyl) benzene [hereinafter abbreviated as peroxide (A)] and 0.5 part by weight of divinylbenzene [hereinafter abbreviated as DVB] were stirred and mixed with a Henschel mixer.

Next, this mixture was extruded at 220 ° C. in a nitrogen atmosphere using a single screw extruder having an L / D of 30 and a screw diameter of 50 mm to obtain a thermoplastic elastomer (a).

The gel content of the thermoplastic elastomer (a) obtained was 84% by weight as determined by the above method. This thermoplastic elastomer (a) was extruded at a temperature of 230 ° C. to form a glass run channel main body and a draining portion, and the intrinsic viscosity [η] measured in a decalin solvent at 135 ° C. was 28 dl / g. An ultrahigh molecular weight polyethylene composition [MFR: 0.1 g / 10 min or less, density: 0.90 g / cm ³ ] comprising 23% by weight of the ultrahigh molecular weight polyethylene and 77% by weight of the thermoplastic elastomer (a). The glass run channel of the present invention was obtained by co-extrusion and lamination at 250 ° C.

The obtained glass run channel has a substantially trapezoidal shape. In FIG. 3, the total length of the inclined portion and the horizontal portion of the glass run channel 1 fixed to the window frame 13 is 1500 mm, The length of the part is 90 mm,
In FIG. 1, the bottom outer width of the main body 2 is 15 mm, the side outer height is 20 mm, and the length of the draining part 3 is 10 mm, which is almost equal to the cross-sectional shape shown in FIG. The thickness was 30 μm on average.

The time required for forming the glass run channel was 0.2 minutes shorter per m than the time required by the conventional method, and was 60% of the time required by the conventional method. The obtained glass run channel was mounted on a test window frame, a 3.2 mm-thick window glass was fitted, and a durability test (upper and lower window glass repeated test) was performed. As a result, this glass run channel was able to withstand the 50,000 repetitions of the windowpane vertical test, and maintained its function as a glass run channel. However, the conventional glass run channel (in which the sliding portion of the window glass has a laminated structure in which a nylon film is bonded to a soft vinyl chloride resin layer) is 25,
After 000 times, breakage occurred at the window glass contact surface, and as a result, the frictional resistance with the window glass was significantly increased, and the product could not be used.

[0072]

Example 2 Example 1 was repeated except that the thermoplastic elastomer (b) was produced without using the peroxide (A) and DVB.

The ultra-high molecular weight polyethylene composition has the following composition:
When the intrinsic viscosity [η] measured in a decalin solvent at 135 ° C. is 2
8 dl / g of ultra high molecular weight polyethylene 23% by weight and the thermoplastic elastomer (b) 77% by weight,
MFR is 0.1 g / 10 min or less and density is 0.90
g / cm ³ .

The time required for forming the obtained glass run channel was 60% of the time required by the conventional method, and the vertical repetition test of the window glass withstood 50,000 times.

[0075]

Example 3 In Example 1, in addition to EPDM (1) and PP (1), butyl rubber [IIR, manufactured by Esso Corporation]
-065, degree of unsaturation 0.8 mol%, hereinafter, IIR (1)
[Abbreviation] and 10 parts by weight of paraffin-based process oil [Diana Process Oil manufactured by Idemitsu Kosan Co., Ltd.] to produce thermoplastic elastomer (c). The gel content of the thermoplastic elastomer (c) was 70%.

The ultra-high molecular weight polyethylene composition is as follows:
When the intrinsic viscosity [η] measured in a decalin solvent at 135 ° C. is 2
8 dl / g of ultra-high molecular weight polyethylene 23% by weight and the thermoplastic elastomer (c) 77% by weight,
MFR is 0.1 g / 10 min or less and density is 0.90
g / cm ³ .

The glass run channel obtained withstood 50,000 repetitions of the windowpane vertical test.

[0078]

Example 4 Paraffin-based process oil is 40 PHR
Oil-extended ethylene / propylene / 5-ethylidene-2-norbornene copolymer rubber [ethylene content 78 mol%,
Iodine value 13, Mooney viscosity ML _{1 + 4} (100 ° C) 7
5, hereinafter abbreviated as EPDM (2)], 64 parts by weight and MF
R (ASTM D 1238-65T, 230 ° C) 11
g / 10 minutes, polypropylene having a density of 0.91 g / cm ³ [hereinafter abbreviated as PP (2)] 14 parts by weight, butyl rubber [Mooney viscosity ML _{1 + 4} (100 ° C.) 45, degree of unsaturation 1.0 mol] %, Hereinafter abbreviated as IIR (2)] 14 parts by weight and 8 parts by weight of a paraffinic process oil are kneaded at 180 ° C. for 5 minutes in a nitrogen atmosphere using a Banbury mixer, and the kneaded material is rolled. To form a sheet, which was cut with a sheet cutter to produce square pellets.

Next, the square pellets and a solution obtained by dissolving and dispersing 0.4 parts by weight of peroxide (A) in 0.4 parts by weight of DVB were stirred and mixed with a tumbler blender, and the solution was uniformly spread on the surface of the square pellets. Attached.

Next, the pellets were extruded using an extruder.
The mixture was extruded at 210 ° C. in a nitrogen atmosphere to obtain a pellet-shaped thermoplastic elastomer (d). The gel content of the thermoplastic elastomer (d) was 57%.

Thereafter, the same procedure as in Example 1 was performed. In addition,
The ultrahigh molecular weight polyethylene composition is composed of 23% by weight of ultrahigh molecular weight polyethylene having an intrinsic viscosity [η] of 28 dl / g measured in a decalin solvent at 135 ° C. and 77% by weight of the thermoplastic elastomer (d). Is 0.1 g /
10 minutes, and the density was 0.89 g / cm ³ .

The obtained glass run channel endured 50,000 repetitions of the windowpane vertical test.

[0083]

Example 5 In Example 1, instead of 80 parts by weight of EPDM (1) and 20 parts by weight of PP (1), an ethylene content of 82 mol%, an iodine value of 9, and a Mooney viscosity of ML _{1 + 4 were used.}
(100 ° C.) 25 ethylene / propylene / 5-ethylidene-2-norbornene copolymer rubber [hereinafter referred to as EPDM
(Abbreviated as (3)] 40 parts by weight, and MFR (ASTM
D1238-65T, 230 ° C.) polypropylene having a density of 0.91 g / cm ³ and a density of 0.91 g / cm ³ [hereinafter, PP
(Abbreviated as (3))], and the compounding amounts of peroxide (A) and DVB were each 0.2 parts by weight,
A thermoplastic elastomer (e) was obtained in the same manner as in Example 1 except that the amount was changed to 0.3 part by weight. The gel content of the thermoplastic elastomer (e) was 32%. Next, the obtained thermoplastic elastomer (e) was extruded at a temperature of 180 ° C. to form a glass run channel main body and a draining portion, and the surface thereof had an intrinsic viscosity [η] measured in a decalin solvent at 135 ° C. ] Of 18 wt% of ultra high molecular weight polyethylene having 7.2 dl / g and 82 wt% of the obtained thermoplastic elastomer (e) [MFR (230 ° C., 2.16 kg load)] 0.2 g / 10 min, density 0.88 g / cm ³ ]
Was co-extruded and laminated at 230 ° C. to obtain a glass run channel similar to that of Example 1.

The glass run channel obtained withstood 50,000 repetitions of the windowpane vertical test.

[Brief description of the drawings]

FIG. 1 is a sectional view of a glass run channel according to the present invention.

FIG. 2 is an enlarged sectional view of a contact portion of the glass run channel shown in FIG. 1 with a window glass.

FIG. 3 is a diagram illustrating attachment of a glass run channel to an automobile door.

FIG. 4 is a sectional view showing a state of a glass run channel when a window glass is opened.

FIG. 5 is a cross-sectional view showing a state of the glass run channel when the window glass is closed.

[Explanation of symbols]

1 ····· Glass run channel 2 ···· Glass run channel main body 3 ···· Draining part 4 ···· Contact part with window glass 7 ···· Made of thermoplastic elastomer Base layer 8 ····· Substrate layer surface having a repeating pattern of fine irregularities (applied as necessary) 9 ····· Slip resin layer made of ultra-high molecular weight polyolefin composition 10 ··· Fine Lubricious resin layer surface with a repeating pattern of irregularities (applied as needed)

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Kyoko Kobayashi 3 Chigusa Coast, Ichihara-shi, Chiba Mitsui Petrochemical Industry Co., Ltd. (56) References JP-A-2-14143 (JP, A) JP-A 5-77363 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B60J 10/04 B32B 1/00-35/00

Claims (3)

(57) [Claims] 1. A glass run channel comprising a groove-shaped main body in a cross section and a tongue-shaped drain portion protruding from the vicinity of the side wall apex toward the center, wherein a window of the glass run channel is provided. The contact portion with the glass comprises a thermoplastic elastomer (A) layer composed of a crystalline polyolefin and a rubber, and an ultrahigh molecular weight polyolefin composition (B) layer, and the ultrahigh molecular weight polyolefin composition (B ) The layer is configured to be in contact with a window glass, and the ultrahigh molecular weight polyolefin composition (B) has an intrinsic viscosity [η] 5 measured in a decalin solvent at 135 ° C.
An ultrahigh molecular weight polyolefin substantially in the range of 40 dl / g and the thermoplastic elastomer (A), wherein the ultrahigh molecular weight polyolefin is the total weight of the ultrahigh molecular weight polyolefin and the thermoplastic elastomer (A) It is present at a ratio of 15 to 40% by weight with respect to 100% by weight, and the melt flow rate (230 ° C., 2.16 kg load) of the ultrahigh molecular weight polyolefin composition (B) is 5 g / 10 minutes or less. A glass run channel characterized by: 2. The thermoplastic elastomer (A) constituting the thermoplastic elastomer (A) layer and the ultrahigh molecular weight polyolefin composition (B) comprises: 70 to 10 parts by weight of a crystalline polypropylene (a); Rubber (b) 30 comprising copolymer rubber or ethylene / propylene / diene copolymer rubber
-90 parts by weight [total of components (a) and (b) is 1
Wherein the rubber (b) is a partially crosslinked thermoplastic elastomer obtained by dynamically heat-treating a mixture of the rubber and the rubber (b) in the presence of an organic peroxide. Item 2. A glass run channel according to Item 1. 3. The ultrahigh molecular weight polyolefin composition (B) contains 1 to 20% by weight of a liquid or solid lubricating oil based on the ultrahigh molecular weight polyolefin composition (B). Item 3. The glass run channel according to item 1 or 2.