JPH06182951A - Gasket for building - Google Patents

Abstract

PURPOSE:To improve sealing contact and light slidability at the time of closing and opening a door with excellent economy and durability by employing a gasket for building having a thermoplastic elastomer layer formed of crystalline polyolefin and rubber and an ultra-high-molecular-weight polyolefin composition layer. CONSTITUTION:A building gasket is formed of a thermoplastic elastomer layer formed of crystalline polyolefin and rubber, and an ultra-high-molecular-weight polyolefin composition layer. The composition substantially contains ultra-high- molecular-weight polyolefin having a critical viscosity eta measured in decalin solvent at 135 deg.C and in a range of 5-40dl/g and thermoplastic elastomer. The polyolefin is 15-40wt.% to 100wt.% of gross weight of the polyolefin and the elastomer, and a melt flow rate of the composition is 5g/10min or less.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a building gasket, and more particularly to a building gasket having a sliding portion composed of a laminate composed of a thermoplastic elastomer base layer and a slip resin surface layer. .

[0002]

BACKGROUND OF THE INVENTION Generally, in doors, doors, sashes, etc. of buildings, in order to keep people in and out or for ventilation ventilation,
Opening and closing operations are required. A guide member called a gasket is provided on the door or the like in order to facilitate the opening / closing operation of the door or the like and also to enable a tight sealing operation between the door and a portion hit by the door.

For conventional building gaskets, soft synthetic resins such as soft vinyl chloride resins and vulcanized rubbers such as ethylene / propylene / diene copolymer rubbers are often used. Further, a special material such as foamed silicone rubber is used in a portion where higher performance sliding characteristics are required.

Since conventional synthetic soft resin gaskets and vulcanized rubber gaskets are not particularly excellent in sliding characteristics, they tend to become settled or deformed significantly after long-term use, and thus, they cannot be used as gaskets. Functions tended to deteriorate.

Although the above problems can be solved by using a material having excellent sliding characteristics such as foamed silicone rubber, there is a problem that the cost is higher than that of general soft synthetic resin or vulcanized rubber. there were.

[0006] Therefore, the inventors of the present invention have diligently studied to solve the above-mentioned problems of the building gasket, and select a polyolefin-based thermoplastic elastomer as the elastomer constituting at least the sliding portion of the building gasket,
If a specific ultra-high molecular weight polyolefin composition is heat-sealed and laminated on the polyolefin-based thermoplastic elastomer layer, the manufacturing operation is easy, and further, the durability, the close contact property when the door or the like is closed, and The inventors have found that it is possible to inexpensively obtain a building gasket excellent in light sliding property when opened, and have completed the present invention.

[0007]

SUMMARY OF THE INVENTION The present invention is intended to solve the problems associated with the prior art as described above, and is excellent in economy, durability, close contact property when a door or the like is closed, and opening. It is an object of the present invention to provide a building gasket that is excellent in light and easy sliding property.

[0008]

SUMMARY OF THE INVENTION A building gasket according to the present invention comprises a thermoplastic elastomer (A) layer composed of crystalline polyolefin and rubber, and an ultra high molecular weight polyolefin composition (B) layer, The ultrahigh molecular weight polyolefin composition (B) is an ultrahigh molecular weight polyolefin having an intrinsic viscosity [η] measured in a 135 ° C decalin solvent of 5 to 40 dl / g, and the thermoplastic elastomer (A). And the ultra high molecular weight polyolefin is 15 to 40 based on 100% by weight of the total weight of the ultra high molecular weight polyolefin and the thermoplastic elastomer (A).
Is present in a weight percentage and is the melt flow rate of the ultra high molecular weight polyolefin composition (B) (ASTM D1
238, 230 ° C., 2.16 kg load) is 5 g / 10 minutes or less.

As the thermoplastic elastomer (A), 70 to 10 parts by weight of crystalline polypropylene (a),
Rubber (b) 30 composed of ethylene / propylene copolymer rubber or ethylene / propylene / diene copolymer rubber
~ 90 parts by weight [the total amount of components (a) and (b) is 1
The amount of the rubber (b) is partially crosslinked, which is obtained by dynamically heat-treating a mixture of the rubber (b) with 100 parts by weight].

The ultrahigh molecular weight polyolefin composition (B) is the ultrahigh molecular weight polyolefin composition (B).
It may contain 1 to 20% by weight of liquid or solid lubricating oil.

[0011]

DETAILED DESCRIPTION OF THE INVENTION The building gasket according to the present invention will be specifically described below. The building gasket according to the present invention is composed of a layer made of a thermoplastic elastomer (A) and a layer made of a specific ultrahigh molecular weight polyolefin composition (B).

First, the components constituting these layers will be described. Thermoplastic Elastomer (A) The thermoplastic elastomer (A) used in the present invention is composed of crystalline polyolefin and rubber.

Examples of the crystalline polyolefin used in the present invention include homopolymers or copolymers of α-olefins having 2 to 20 carbon atoms. Specific examples of the crystalline polyolefin include the following (co) polymers. (1) Ethylene homopolymer (manufacturing method may be either low pressure method or high pressure method) (2) Copolymerization of ethylene with 10 mol% or less of other α-olefin or vinyl monomer such as vinyl acetate or ethyl acrylate Polymer (3) Propylene homopolymer (4) Random copolymer of propylene and 10 mol% or less of other α-olefins (5) Block copolymerization of propylene and 30 mol% or less of other α-olefins Combined (6) 1-butene homopolymer (7) Random copolymer of 1-butene and other α-olefin at 10 mol% or less (8) 4-Methyl-1-pentene homopolymer (9) 4 -Methyl-1-pentene and other α up to 20 mol%
-Random copolymer with olefin As the above α-olefin, specifically, ethylene, propylene, 1-butene, 4-methyl-1-pentene, 1-
Examples include hexene and 1-octene.

The rubber used in the present invention is not particularly limited, but an olefin copolymer rubber is preferable. The above 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 Examples include α-olefin / non-conjugated diene copolymers composed of diene.

Specific examples of such an olefinic copolymer rubber include the following rubbers. (1) Ethylene / α-olefin copolymer rubber [ethylene / α-olefin (molar ratio) = about 90/10
To 50/50] (2) Ethylene / α-olefin / non-conjugated diene copolymer rubber [ethylene / α-olefin (molar ratio) = about 90/10
50/50] (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.

Specific examples of the non-conjugated diene include:
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 10 to 250, especially 40 to 150
Is preferred. The iodine value when the non-conjugated diene is copolymerized is preferably 25 or less.

The above-mentioned olefinic copolymer rubber can exist in all crosslinked states such as uncrosslinked, partially crosslinked and totally crosslinked in the thermoplastic elastomer, but in the present invention, it can be present in partially crosslinked state. It is preferably 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 other diene rubbers, SEBS, polyisobutylene, and the like.

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

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

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

If necessary, the above-mentioned thermoplastic elastomer may contain additives such as a mineral oil type softener, a heat stabilizer, an antistatic agent, a weather stabilizer, an antiaging agent, a filler, a colorant and a lubricant. , Can be added 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 crystalline polypropylene (a), ethylene / propylene copolymer rubber or ethylene / propylene / diene copolymer. 40 to 90 parts by weight of rubber (b) composed 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 to 100 parts by weight of a mineral oil-based softening agent (d) are dynamically heat-treated in the presence of an organic peroxide to obtain a mixture. A thermoplastic elastomer in which the rubber (b) is partially cross-linked is mentioned.

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-butyl cumyl peroxide and the like can be mentioned.

Among these, 2,5-dimethyl-2,5-di- (tert-butylperoxy) hexane and 2,5-dimethyl-2,5-di-from the viewpoint 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 among them, 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, based on 100% by weight of the total amount of the crystalline polyolefin and 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 Methylolpropane-N, N'-m-Peroxy crosslinking aid such as phenylene dimaleimide, 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 the above compound,
A uniform and mild crosslinking reaction can be expected. Particularly, divinylbenzene is most preferred in the present invention. Divinylbenzene is a dispersant for organic peroxide, which is easy to handle, has good compatibility with the crystalline polyolefin and the rubber which are the main components of the above-mentioned substance to be crosslinked, and has the action of solubilizing organic peroxide. As a result, a thermoplastic elastomer having a uniform cross-linking effect by heat treatment and a good balance of fluidity and physical properties can be obtained.

The cross-linking aid or polyfunctional vinyl monomer as described above is added to the whole article 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. When the blending ratio of the crosslinking aid or the polyfunctional vinyl monomer exceeds 2% by weight, when the blending amount of the organic peroxide is large, the crosslinking reaction proceeds too fast. On the other hand, when the amount of the organic peroxide is small, the cross-linking aid and the polyfunctional vinyl monomer remain as unreacted monomers in the thermoplastic elastomer, and the thermoplastic elastomer does not undergo heat treatment during molding. Physical properties may change due to history. Therefore, the cross-linking aid and the polyfunctional vinyl monomer should not be blended in excess.

The above-mentioned "dynamically heat treating" means kneading each of 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 device 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 170
To 240 ° C., and the kneading time is 1 to 20 minutes, preferably 3 to 10 minutes. Also, the shearing force applied is
The shear rate is 10 sec ^-1 or more, preferably 100-
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" means that the gel content measured by the following method is in the range of 20 to 98%. The gel content is preferably in the range of 40 to 98% in the present invention.

[Method for measuring gel content] About 100 mg of a pellet of a thermoplastic elastomer was weighed as a sample, and 30 ml which was a sufficient amount for this pellet in a closed container.
Immerse the same 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 a constant weight is obtained. The gel content is represented by the following formula. Gel content [%] = (dry weight after immersion in cyclohexane)
÷ (Weight before dipping in cyclohexane) × 100 The thermoplastic elastomer (A) that constitutes one layer of the thermoplastic elastomer laminate according to the present invention is excellent in fluidity because it comprises crystalline polyolefin and rubber.

[0036] 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) Intrinsic viscosity [η] measured in decalin solvent at 135 ° C. is 5 to 40 dl / g, preferably 15 to
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. (MFR, according to ASTM D 1238, 230 ° C,
2.16 kg load) is 5 g / 10 minutes or less, preferably 1
An ultra high molecular weight polyolefin composition having a content of 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) above and 1 to 20% by weight of a liquid or solid lubricating oil based on the ultrahigh molecular weight polyolefin composition.

Examples of the ultrahigh molecular weight polyolefin as described above include ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 1-dodecene, 4-methyl-1-pentene, It is composed of a homopolymer or a copolymer of α-olefin such as 3-methyl-1-pentene. In the present invention, ethylene homopolymers and ethylene-based copolymers composed of ethylene and other α-olefins are preferred.

The thermoplastic elastomer (A) constituting these ultra high molecular weight polyolefin compositions is the same as the above-mentioned thermoplastic elastomer (A), and is composed of crystalline polyolefin and rubber.

As the liquid lubricating oil used in the above composition (2), petroleum-based 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, and cylinder oil.

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 and chlorinated biphenyl. Oil, silicone oil, etc. are used.

As the solid lubricating oil used in the composition of (2), specifically, graphite and molybdenum disulfide are mainly used, but boron nitride, tungsten disulfide and lead oxide are also used. Glass powder, metallic soap, etc. can also be used. The solid lubricating oil can be used alone or in combination with the liquid lubricating oil, and can be blended with the ultra high molecular weight polyolefin in the form of, for example, powder, sol, gel, suspense.

If necessary, the above ultrahigh molecular weight polyolefin composition may contain a mineral oil softener, a heat stabilizer, an antistatic agent, a weather stabilizer, an antiaging agent, a filler, a coloring agent, a lubricant, etc. Additives can be added within a range that does not impair the object of the present invention.

The ultrahigh molecular weight polyolefin composition of the above (1) and (2) is the above ultrahigh molecular weight polyolefin,
It can be obtained by dynamically heat-treating the above-mentioned thermoplastic elastomer (A) and the above-mentioned other components used as necessary. Here, "dynamically heat-treating" means kneading each of 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 and the like are used. Of these, a non-open type kneading device 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 composition (B) of (1) and (2) can be subjected to coextrusion lamination processing with the thermoplastic elastomer (A), and therefore, in the production of the glass run channel of the present invention. , Film (sheet)
It is economical because the thermoplastic elastomer layer and the ultrahigh molecular weight polyolefin composition layer can be directly laminated without a molding step.

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

Building Gasket As described above, the building gasket according to the present invention has the above-mentioned thermoplastic elastomer (A) layer (base layer).
And an ultrahigh molecular weight polyolefin composition (B) layer (slipping resin layer) as described above.

The building gasket according to the present invention can be obtained by laminating the above two layers. A thermoplastic elastomer (A) layer [hereinafter, abbreviated as (A) layer] and an ultrahigh molecular weight polyolefin composition (B) layer [hereinafter,
(B) layer and abbreviated]
Depending on the size and required performance, it is not particularly limited,
For example, the following laminating methods may be mentioned. (1) A method of heat-sealing the preformed layers (A) and (B) using a compression molding machine or the like at a temperature equal to or higher than the temperature at which at least one layer melts. (2) A method in which the (A) layer and the (B) layer are simultaneously extrusion-molded by a multilayer extrusion molding machine and heat-sealed (coextrusion molding).

In the present invention, the thickness of the layer (A) is 0.
1 to 50 mm, and the thickness of the (B) layer is 5 μm to 10 m
m is generally preferred. In the building gasket according to the present invention, since the thermoplastic elastomer (A) layer is composed of crystalline polyolefin and rubber, it has excellent heat resistance, heat aging resistance and rubber elasticity.

Further, in the building gasket according to the present invention, the above-mentioned ultra high molecular weight polyolefin composition (B) layer is excellent in abrasion resistance, scratch resistance, slidability and chemical resistance.

An example of using the building gasket according to the present invention is shown in FIG. Between the wall 1 and the wall 2, there are two doors 3 and 4. Door 3 rotates in the PQ direction with hinge 5 as a fulcrum, and door 4
A gasket 6 is attached to the contact portion with.

On the other hand, the door 4 moves in the R-S direction, and can make close contact with the door 3 via the gasket 6 and with the wall 2 via the two gaskets 7. FIG. 2 shows a cross section of the gasket 6.

The gasket 6 is composed of base layers 8 and 9 made of the thermoplastic elastomer (A) and a slip resin layer 10 made of the ultrahigh molecular weight polyolefin composition (B). Heat-sealed with sufficient strength. Of the base layers 8 and 9, the base layer 9 is a portion embedded in the door 3.

The gasket 6 maintains the tightness between the doors 3 and 4 by closing the door 3 and bringing it into contact with the door 4 and applying a key (not shown) with the U-shaped portion compressed and deformed. You can

Further, when the door 4 is opened and closed, the U-shaped portion of the gasket 6 is deformed to maintain the tightness between the door 3 and the door 4,
Since the layer 10 made of the ultra-high molecular weight polyolefin composition (B) having excellent sliding properties greatly reduces the force required for opening and closing, the door 4 can be opened and closed lightly.

FIG. 3 shows a cross section of the gasket 7. The gasket 7 is composed of base layers 11 and 12 made of a thermoplastic elastomer (A) and a slipping resin layer 13 made of an ultra high molecular weight polyolefin composition (B). It is fused. The base layers 11, 1
Of the two, the layer 12 is an embedded part in the wall 2.

When the gasket 7 comes into contact with the door 4, the fin portion at the tip of the gasket 7 is deformed to maintain the tightness between the wall 2 and the door 4. The fin portion of the gasket 7 is required to have slidability and durability as well as flexibility, and the surface layer of this portion is a slippery resin comprising an ultrahigh molecular weight polyolefin composition (B) having excellent slidability and durability. The door 4 can be opened and closed easily by using the layer 13.

According to the present invention, as a building gasket, by providing a slipping resin layer made of the ultrahigh molecular weight polyolefin composition (B) on a base layer made of a thermoplastic elastomer (A), slidability, A gasket with excellent durability can be obtained, which enables smooth and light operation of opening and closing the door.

The thermoplastic elastomer (A) used in the present invention can be thermoformed into any shape and size, and has elasticity, flexibility and compressibility required for the sliding portion of the building gasket. It has excellent properties such as durability, and also has excellent properties such as durability, weather resistance, and water resistance.

[0062]

EFFECTS OF THE INVENTION The construction gasket according to the present invention is superior in wear resistance, durability and sliding characteristics to the conventional soft synthetic resin or vulcanized rubber gasket, and can be easily manufactured. , Excellent in economy.

The building gasket according to the present invention is
Compared to conventional gaskets made of soft synthetic resin or vulcanized rubber, it is lighter in weight, does not get sticky on the surface due to leaching of plasticizers, etc., and has excellent mechanical strength, heat resistance, heat aging resistance, weather resistance, and dimensional stability. Are better.

The present invention will be described below with reference to examples.
The present invention is not limited to these examples.

[0065]

Example 1 Ethylene content 70 mol%, iodine value 1
2. 75 parts by weight of ethylene / propylene / 5-ethylidene-2-norbornene copolymer rubber having a Mooney viscosity of ML _{1 + 4} (100 ° C.) of 120 and MFR (ASTM D 1238)
-65T, 230 ° C) 13g / 10 minutes, density 0.91g
25 parts by weight of polypropylene / cm ³ was kneaded with a Banbury mixer in a nitrogen atmosphere at 180 ° C. for 5 minutes, and the kneaded product was passed through a roll to form a sheet,
This was cut with a sheet cutter to produce square pellets.

Next, this square pellet and 1,3-bis (t
ert-butylperoxyisopropyl) benzene 0.
3 parts by weight and 0.5 parts by weight of divinylbenzene were mixed by stirring with a Henschel mixer.

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

The gel content of the obtained thermoplastic elastomer (a) was 97% by weight as determined by the above method. This thermoplastic elastomer (a) and MFR
(ASTM D 1238, 230 ° C., 2.16 kg load) 0.1 g / 10 minutes, and an ultra high molecular weight polyethylene composition (b) having a density of 0.90 g / cm ³ at 230 ° C.
A gasket of the present invention was obtained by coextrusion at the temperature of.

The ultrahigh molecular weight polyethylene composition (b) was used in the ultrahigh molecular weight polyethylene 23 having an intrinsic viscosity [η] measured in a decalin solvent of 135 ° C. of 28 dl / g.
%, And 77% by weight of the thermoplastic elastomer (a) obtained as described above.

The shape of the obtained gasket is as shown in FIG. 2, and the dimension of this gasket is that w ₁ is 9.0 m.
m, w ₂ and w ₃ are each 1.5 mm and t is 1.0
mm and h were 8.0 mm, the thickness of the U-shaped portion was 0.8 mm, and the thickness of the ultrahigh molecular weight polyethylene composition layer was 30 μm on average.

The obtained gasket was mounted as the gasket 6 of the door 3 shown in FIG. 1, and the glass door 4 having a thickness of 8 mm was attached.
Was repeatedly opened and closed to perform a durability test. As a result, this gasket survived the repeated test of 50,000 times and maintained the function as a gasket.

However, the conventional soft vinyl chloride resin gasket was broken at the contact surface with the door after 22,000 cycles, and as a result, the frictional resistance with the door was significantly increased, and it became unusable.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional plan view for explaining a usage state of an example of a building gasket according to the present invention.

2 is a cross-sectional view of the gasket 6 in FIG.

3 is a cross-sectional view of the gasket 7 in FIG.

[Explanation of symbols]

 1, 2 ・ ・ ・ ・ Walls 3, 4 ・ ・ ・ ・ Doors 5 ・ ・ ・ ・ Hinge 6,7 ・ ・ ・ ・ Gaskets 8, 9 ・ ・ ・ ・ Thermoplastic elastomer layer 10 ・ ・ ・ ・ Ultra high molecular weight polyolefin Composition layer 11, 12 ··· Thermoplastic elastomer layer 13 ··· Ultra high molecular weight polyolefin composition layer

Front Page Continuation (72) Inventor Akira Uchiyama 3 Chikusaigan, Ichihara, Chiba Mitsui Sekiyu Kagaku Kogyo Co., Ltd.

Claims (3)

[Claims] 1. A thermoplastic elastomer (A) layer composed of crystalline polyolefin and rubber, and an ultrahigh molecular weight polyolefin composition (B) layer, wherein the ultrahigh molecular weight polyolefin composition (B ) Has an intrinsic viscosity [η] of 5 measured in a decalin solvent at 135 ° C.
To 40 dl / g, which consists essentially of an ultrahigh molecular weight polyolefin and the thermoplastic elastomer (A), wherein the ultrahigh molecular weight polyolefin is the total of the ultrahigh molecular weight polyolefin and the thermoplastic elastomer (A). It exists in a ratio of 15 to 40% by weight with respect to 100% by weight, and the melt flow rate of the ultrahigh molecular weight polyolefin composition (B) (ASTM D1238, 230 ° C, 2.16k).
g load) is 5 g / 10 minutes or less, a building gasket. 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 crystalline polypropylene (a); Rubber (b) 30 comprising a copolymer rubber or an ethylene / propylene / diene copolymer rubber
~ 90 parts by weight [the total amount of components (a) and (b) is 1
00 parts by weight], and the rubber (b) is a partially crosslinked thermoplastic elastomer obtained by dynamically heat-treating the mixture in the presence of an organic peroxide. Item 1. The building gasket 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 1. The building gasket according to Item 1 or 2.