JP2001031815A - Rubber composition for construction gasket and gasket for construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject composition having a high glass holding power and excellent in weather resistance, creep resistance and coloring property by incorporating a specific ethylene/an α-olefin/a non-conjugated polyene random copolymer rubber, etc. SOLUTION: This rubber composition contains (A) 5-100 pt.wt. ethylene/an α-olefin/a non-conjugated polyene random copolymer rubber containing the non-conjugated polyene consisting of a terminal vinyl group-containing norbornene compound of formula I [(n) is 0-10; R1 is H or a 1-10C alkyl; R2 is H or a 1-5C alkyl] or formula II (R3 is H or a 1-10C alkyl), (B) 95-0 pt.wt. organopolysiloxane having the averaged compositional formula: R1nSiO(4-n)/2 [R1 is a (substituted) monovalent hydrocarbon; (n) is a positive number of 1.95-2.05] and (C) an organohydrogen-polysiloxane having at least two H bonded with Si in one molecule in an amount capable of giving 0.2-5 H bonded with Si based on one aliphatic unsaturated bond in the components A, B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a rubber composition for a building gasket and a building gasket obtained from the rubber composition.

[0002]

2. Description of the Related Art In recent years,
As the service life of buildings increases, for example, gaskets used for fixing glass and the like to window frames, such as zipper type gaskets, are required to have weather resistance, creep resistance, coloring property, workability, and the like. ing. Conventionally, as a zipper type gasket for construction, ethylene-
Molded rubber materials such as propylene-diene rubber and chloroprene rubber are used. However, these zipper type gaskets have a disadvantage that weather resistance, creep resistance, and coloring property are insufficient. Also, conventional zipper type gaskets are hardened at low temperatures due to their material, so when installed in winter, the groove-shaped zipper provided on the gasket is replaced with a rail provided in a fixed place in a form corresponding to this zipper There is a drawback that it becomes difficult to insert into the protruding portion, and a great deal of labor is required.

[0003] Accordingly, an object of the present invention is to provide a high glass holding power, excellent weather resistance, creep resistance, and colorability, and furthermore, stable and easy to apply to temperature changes throughout the year. And a building gasket formed from the rubber composition.

[0004]

Means for Solving the Problems and Embodiments of the Invention As a result of intensive studies to achieve the above object, the present inventor has found that non-conjugated polyenes are generally used in the production of building gaskets such as zipper type gaskets. Formula [I] or [I
I] with respect to an ethylene / α-olefin / non-conjugated polyene random copolymer rubber comprising at least one type of norbornene compound having a terminal vinyl group or a mixture of the rubber and an organopolysiloxane; By using an olefin rubber composition containing an organohydrogenpolysiloxane having at least two bonded hydrogen atoms (SiH groups) and a platinum group metal catalyst, the glass holding power is high, the weather resistance and the creep resistance are high. The present inventors have found that an architectural gasket having excellent properties and coloring properties and excellent temperature stability can be obtained, and have accomplished the present invention.

That is, the present invention relates to (A) a non-conjugated polyene represented by the following general formula [I] or [II]:

Embedded image (In the formula, n is an integer of 0 to 10, R ¹ is a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, and R ² is a hydrogen atom or an alkyl group having 1 to 5 carbon atoms. )

Embedded image (In the formula, R ³ is a hydrogen atom or an alkyl group having 1 to 10 carbon atoms.) An ethylene / α-olefin / non-conjugated polyene random copolymer comprising at least one kind of norbornene compound having a terminal vinyl group represented by the following formula: 5 to 100 parts by weight of polymer rubber, (B) the following average composition formula (1) R ¹ _n SiO _{(4-n) / 2} (1) (wherein R ¹ represents an unsubstituted or substituted monovalent hydrocarbon group) And n is a positive number from 1.95 to 2.05.) 95 to 0 parts by weight of an organopolysiloxane represented by the following formula: (C) an organo having at least two hydrogen atoms bonded to a silicon atom in one molecule. Nohydrogenpolysiloxane An amount giving 0.2 to 5 hydrogen atoms bonded to silicon atoms per aliphatic unsaturated bond in the components (A) and (B). (D) Platinum group metal catalyst For construction gaskets containing Providing building gasket made of olefin-based rubber composition and its cured product.

Hereinafter, the present invention will be described in more detail. The first essential component [component (A)] of the rubber composition of the present invention is an ethylene in which the non-conjugated polyene is at least one kind of a norbornene compound having a terminal vinyl group represented by the above general formula [I] or [II]. • α-olefin / non-conjugated polyene random copolymer rubber. The diene moiety is 5-vinyl-
2-norbornene and 5-methylene-2-norbornene are preferable. For example, this copolymer is obtained by mixing ethylene, propylene and 5-vinyl-2-norbornene in the presence of a catalyst containing vanadium and organoaluminum as main components. Obtained by random copolymerization. As a specific example of the catalyst, the vanadium catalyst is VOCl ₃ , VO (OC ₂ H
₅ ) _{3 and the} like, and examples of the organoaluminum catalyst include triethylaluminum and diethylaluminum ethoxide. The polymerization temperature at this time is 30 to 60.
° C, more preferably 30 to 50 ° C, and a polymerization pressure of 4 to
12kgf / cm ^2, in particular 5~8kgf / cm ^2,
Obtained by random copolymerization of ethylene, propylene and 5-vinyl-2-norbornene under the conditions of the molar ratio of the supply amount of non-conjugated polyene and ethylene (non-conjugated polyene / ethylene) of 0.01 to 0.2. . Note that the copolymerization is preferably performed in a hydrocarbon medium.

The diene component to be copolymerized is represented by the above general formula [I] or [I] as long as the object of the present invention is not impaired.
In addition to the ethylene / α-olefin / non-conjugated polyene random copolymer rubber comprising at least one kind of norbornene compound having a terminal vinyl group represented by I], a diene as exemplified below can be used in combination.

The diene includes 5-methylene-2-norbornene, 5- (2-propenyl) -2-norbornene, 5- (3-butenyl) -2-norbornene,
(1-methyl-2-propenyl) -2-norbornene,
5- (4-pentenyl) -2-norbornene, 5- (1
-Methyl-3-butenyl) -2-norbornene, 5-
(5-hexenyl) -2-norbornene, 5- (1-methyl-4-pentenyl) -2-norbornene, 5-
(2,3-dimethyl-3-butenyl) -2-norbornene, 5- (2-ethyl-3-butenyl) -2-norbornene, 5- (6-heptenyl) -2-norbornene,
-(3-methyl-5-hexenyl) -2-norbornene, 5- (3,4-dimethyl-4-pentenyl) -2-
Norbornene, 5- (3-ethyl-4-pentenyl)-
2-norbornene, 5- (7-octenyl) -2-norbornene, 5- (2-methyl-6-heptenyl) -2-
Norbornene, 5- (1,2-dimethyl-5-hexenyl) -2-norbornene, 5- (5-ethyl-5-hexenyl) -2-norbornene, 5- (1,2,3-trimethyl-4-pentenyl) ) -2-norbornene and the like;
4-hexadiene, 3-methyl-1,4-hexadiene, 4-methyl-1,4-hexadiene, 5-methyl-
Chain non-conjugated dienes such as 1,4-hexadiene, 4,5-dimethyl-1,4-hexadiene, 7-methyl-1,6-octadiene, methyltetrahydroindene, 5-ethylidene-2-norbornene, 5-methylene -2-norbornene, 5-isopropylidene-2-norbornene,
Cyclic non-conjugated dienes such as 5-vinylidene-2-norbornene, 6-chloromethyl-5-isopropenyl-2-norbornene, dicyclopentadiene, 2,3-diisopropylidene-5-norbornene, 2-ethylidene-3- Isopropylidene-5-norbornene, 2-propenyl-
And trienes such as 2,2-norbornadiene. Among these, 5-methylene-2-norbornene,
5- (2-propenyl) -2-norbornene, 5- (3
-Butenyl) -2-norbornene, 5- (4-pentenyl) -2-norbornene, 5- (5-hexenyl) -2
-Norbornene, 5- (6-heptenyl) -2-norbornene and 5- (7-octenyl) -2-norbornene are preferred.

The component (A) comprises (a) an ethylene unit and (b) a propylene unit [molar ratio of (a) / (b)].
0/60 to 95/5, preferably 50/50 to 90/1
0, more preferably 55/45 to 85/15, particularly preferably 60/40 to 80/20.

When the molar ratio is within the above range, a building gasket having particularly excellent heat aging resistance, strength characteristics and rubber elasticity, as well as excellent cold resistance and workability can be obtained.

The iodine value of the component (A) is 0.5 to 5
0 (g / 100 g), preferably 0.8 to 40 (g / 1
00g), more preferably 1 to 30 (g / 100g),
Particularly preferably, it is 1.5 to 25 (g / 100 g).

When the iodine value is within the above range, the crosslinking efficiency is high, and a building gasket having excellent resistance to compression set and excellent resistance to environmental degradation (= heat aging resistance) can be obtained. If the iodine value exceeds 50, it is disadvantageous in terms of cost.

Next, the organopolysiloxane of the component (B) is represented by the following average composition formula (1). R ¹ _n SiO _{(4-n) / 2} (1)

In the above formula (1), R ¹ represents an unsubstituted or substituted monovalent hydrocarbon group, which usually has 1 to 10 carbon atoms, particularly 1 to 8 carbon atoms, and specifically includes a methyl group and an ethyl group. Alkyl groups such as propyl, butyl, hexyl and octyl groups; cycloalkyl groups such as cyclopentyl and cyclohexyl groups; alkenyl groups such as vinyl, allyl and propenyl groups; cycloalkenyl groups, phenyl groups and tolyl groups Or an aralkyl group such as a benzyl group or a phenylethyl group, or a halogenated hydrocarbon group in which part or all of the hydrogen atoms of these groups are substituted with an organic group such as a chlorine atom, a fluorine atom, or a cyano group , Cyanated hydrocarbon groups, and the like. Particularly, in general, the organopolysiloxane has a main chain of dimethylsiloxane units or a dimethylsiloxane unit. A diphenylsiloxane unit having a phenyl group, a vinyl group, a 3,3,3-trifluoropropyl group or the like in a part of the main chain of the polysiloxane, a methylvinylsiloxane unit, a methyl-3,3,3-trifluoropropylsiloxane unit It is preferable to use a material in which the above-described method is introduced. In this case, the organopolysiloxane of the component (B) preferably has two or more aliphatic unsaturated groups such as alkenyl groups and cycloalkenyl groups in one molecule.
0.01 to 20 mol% in ^1, in particular 0.02 to 10 mol%
Is preferably an aliphatic unsaturated group, particularly a vinyl group. The aliphatic unsaturated group may be at the terminal of the molecular chain, in the middle of the molecular chain, or at both, but is preferably at least at the terminal of the molecular chain. Note that n is 1.95.
It is a positive number of ~ 2.05.

The organopolysiloxane used in the present invention includes those whose molecular chain ends are blocked with a trimethylsilyl group, a dimethylphenylsilyl group, a dimethylhydroxysilyl group, a dimethylvinylsilyl group, a trivinylsilyl group or the like. Particularly preferred as the organopolysiloxane used in the present invention are methylvinylpolysiloxane, methylphenylvinylpolysiloxane,
Methyl trifluoropropyl vinyl polysiloxane and the like can be mentioned. Such an organopolysiloxane can be obtained, for example, by subjecting one or more of organohalogenosilanes to (co) hydrolytic condensation, or converting a cyclic polysiloxane (such as a siloxane trimer or tetramer) into an alkaline or It can be obtained by ring-opening polymerization using an acidic catalyst. These are basically linear diorganopolysiloxanes, but may be a mixture of two or more kinds having different molecular structures. In addition,
The viscosity of the organopolysiloxane at 25 ° C. is 100
It is preferably at least centistokes (cSt), particularly preferably 100,000 to 100,000,000 cSt.
It is. The degree of polymerization of the organopolysiloxane is preferably 100 or more, particularly preferably 3,000 to 20,000.
It is.

In the present invention, as the rubber component, the non-conjugated polyene of the component (A) is represented by the general formula [I] or [I].
The ethylene / α-olefin / non-conjugated polyene random copolymer rubber comprising at least one kind of norbornene compound having a terminal vinyl group represented by I) and the organopolysiloxane as the component (B) are in a weight ratio of 100: 0 to 100: 5: 9
A mixture of a ratio of 5, more preferably 100: 0 to 60:40, and still more preferably a ratio of 100: 0 to 70:30 is used.

More than two SiHs per molecule of component (C)
The organohydrogenpolysiloxane having a group may be linear, cyclic, or branched,
A known organohydrogenpolysiloxane can be used as a crosslinking agent for the addition-curable silicone rubber composition, and usually, the following average composition formula (2): R ² _{a Hb} SiO _{(4-ab) / 2} ( 2) The following can be used.

In the formula, R ² represents an alkyl group such as a methyl group, an ethyl group or a propyl group, a cycloalkyl group such as a cyclohexyl group, an alkenyl group such as a vinyl group, an allyl group, a butenyl group or a hexenyl group; a phenyl group; Aryl groups such as a tolyl group, aralkyl groups such as a benzyl group, a 2-phenylethyl group, and a 2-phenylpropyl group; and groups in which at least a part of the hydrogen atoms of these groups have been substituted with halogen atoms, for example, 3,3 , 3-trifluoropropyl group and the like,
Same or different, preferably 1 to 12 carbon atoms, especially 1 to 8 carbon atoms
Is an unsubstituted or substituted monovalent hydrocarbon group such as an alkyl group, an alkenyl group, an aryl group, an aralkyl group or a halogen-substituted product thereof, wherein a and b are 1 ≦ a ≦ 2.2, 0.
It is a positive number satisfying 002 ≦ b ≦ 1, 1.002 ≦ a + b ≦ 3.

The above-mentioned SiH group has two or more, preferably three or more in one molecule, and may be at the terminal of the molecular chain or in the middle of the molecular chain. The organohydrogenpolysiloxane has a viscosity at 25 ° C of 0.5 to 10,000 cSt, particularly 1 to 300 cSt.
It is preferably cSt.

Specific examples of such an organohydrogenpolysiloxane include compounds of the following structural formulas.

[0021]

Embedded image (K is an integer of 2 to 10, and m and n are each an integer of 0 to 10.)

The compounding amount of the above-mentioned organohydrogenpolysiloxane is 100% in total of the component (A) and the component (B).
0.1 to 40 parts by weight based on parts by weight. Also,
The ratio of a hydrogen atom (≡SiH group) bonded to a silicon atom to one aliphatic unsaturated bond (alkenyl group, diene group, etc.) of the component (A) and the component (B) is in the range of 0.5 to 10. Is suitable, and preferably, a range of 0.7 to 5 is appropriate. If it is less than 0.5, crosslinking may not be sufficient, and sufficient mechanical strength may not be obtained.
If it is more than 10, physical properties after curing may be reduced, and particularly heat resistance and compression set may be significantly deteriorated.

The platinum group metal-based catalyst comprises component (A), component (B)
It is a catalyst for causing an addition reaction between the aliphatic unsaturated bond (alkenyl group, diene group, etc.) of the component and the silicon-bonded hydrogen atom of the organohydrogenpolysiloxane.
Examples of the platinum group metal-based catalyst include a simple substance of a platinum group metal and a compound thereof, and those known as catalysts for addition reaction-curable silicone rubber compositions can be used. For example,
Silica, fine-particle platinum metal adsorbed on a carrier such as alumina or silica gel, platinic chloride, chloroplatinic acid,
Alcohol solution of chloroplatinic acid hexahydrate, palladium catalyst,
A rhodium catalyst or the like is mentioned, but platinum or a platinum compound is preferable. The amount of the catalyst added may be any as long as the addition reaction can be promoted, and is usually used in the range of 1 ppm to 1% by weight in terms of the amount of platinum-based metal, preferably 10 to 100 pp.
The range of m is appropriate. The reason why the content is 1 ppm or more is that if the content is less than this, the addition reaction is not sufficiently promoted and the curing and foaming are insufficient. Because they are few and uneconomical.

In addition to the above-mentioned catalyst, an addition crosslinking controller may be used for adjusting the curing rate. Specific examples include ethynylcyclohexanol and tetracyclomethylvinylpolysiloxane.

In the rubber composition of the present invention, in addition to the above essential components, optional components for adjusting the physical properties of the cured product, if necessary, such as fumed silica, precipitated silica, aluminum silicate, quartz powder, Quartz powder, diatomaceous earth, talc, clay, calcium carbonate, titanium dioxide,
A reinforcing agent such as carbon black, a conductivity-imparting agent, a flame-retardant-imparting agent such as iron oxide or a halogen compound, a softener, an antioxidant, an ultraviolet absorber, and a coloring agent can be added. The amount of the filler is 500 parts by weight or less, preferably 1 to 250 parts by weight, more preferably 5 to 100 parts by weight, based on 100 parts by weight of the total of the components (A) and (B). If the amount is more than 500 parts by weight, the cured product may be hard and brittle.

Further, the rubber composition of the present invention can be obtained by kneading a predetermined amount of the above-mentioned components with a two-roll, kneader, Hanbury mixer or the like. It can be obtained by kneading with a mixer, etc.
Hydrocarbon-based synthetic oil, mineral oil-based softener such as liquid paraffin, Lucant HC40 (manufactured by Mitsui Chemicals, Inc.), P
When a required amount of W-380 (manufactured by Idemitsu Kosan Co., Ltd.) or the like is added, the viscosity of the composition is reduced and the processability can be improved.

When the architectural gasket of the present invention is used as a sponge (foam), a foaming agent is blended.
As the foaming agent, a known foaming agent such as azodicarbonamide, azobisisobutyronitrile, and benzenesulfonylhydrazide can be used. Further, a known foaming aid can be blended.

The amount of the foaming agent to be added is preferably 0.5 to 30 parts by weight, particularly preferably 2 to 20 parts by weight based on 100 parts by weight of the total of the components (A) and (B).

In the present invention, a building gasket made of a polyolefin rubber can be obtained by subjecting the rubber composition to compression molding and hot air vulcanization into a predetermined gasket shape. In this case, the curing conditions are generally
It is desirable to cure by compression molding at a temperature of 100 to 300 ° C. for 0.5 to 30 minutes, and in hot air vulcanization at a temperature of 100 to 300 ° C., particularly 150 to 250 ° C.
The polyolefin rubber composition can be vulcanized efficiently in a short time under the conditions of 60 minutes, especially 5 to 30 minutes, and the rubber molded product can be continuously vulcanized and molded, and the rubber cured product having good elasticity can be obtained. Gasket can be obtained.
Further, secondary vulcanization may be performed if necessary.

[0030]

According to the present invention, a gasket comprising a polyolefin rubber composition having excellent heat resistance and creep resistance and having good elasticity by compression molding and hot air vulcanization can be efficiently provided in a short time. .

[0031]

EXAMPLES The present invention will be described below in detail with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples. In the following examples, all parts are parts by weight. In the following formula, Me represents a methyl group.

Example 1 As a polyolefin-based synthetic polymer, ethylene / propylene / 5-vinyl-2-norbornene copolymer (ML _{1 + 4} (100 ° C.) 44, ethylene content 57 mol%, iodine value 10) ( Mitsui Chemicals, Inc.
100 parts) and 30 parts of silica Aerosil 200 (manufactured by Nippon Aerosil Co., Ltd.) having a specific surface area of 200 m ² / g.
And a rubber compound was prepared by using two rolls at the ratios shown in Table 1. Then, the following formula obtained above rubber compounds _{(i) C 6 H 5 Si-} (OSiMe 2 H) organohydrogenpolysiloxane 1 represented by ₃ (i).
5 parts, ethynylcyclohexanol 0.0 as a control agent
After adding 6 parts and 0.05 part of a 5% solution of chloroplatinic acid in 5% isopropyl alcohol with two rolls, the composition was extruded (inner diameter (D) of the kneading section (D) 40 mmφ, inner diameter (D)).
The ratio (L / D) of the length (L) of the kneading section to the kneading is 12)
To produce a molded body having a cross-sectional shape as shown in FIG. Crosslinking was carried out at 200 ° C. and hot-air vulcanization at a residence time of 5 minutes, followed by 2 hours at 100 ° C.
The secondary cross-linking was performed for an hour to obtain a zipper type gasket as shown in FIG. Physical properties of the cured rubber constituting the obtained zipper type gasket and wind resistance test of the zipper type gasket were performed. Table 1 shows the results.

The physical properties were measured in accordance with JIS K6249 in terms of hardness (scale), tensile strength, and elongation using an A-type testing machine. As shown, the glass 3 (14
(00 mm × 1840 mm × 15 mm) was fixed via a zipper type gasket 1, a wind pressure (700 kgf / m ² ) was applied perpendicularly to the surface of the glass sheet, and evaluation was made based on whether the glass sheet fell from the frame.

Comparative Example 1 Same as Example 1 except that EPT-3045 (manufactured by Mitsui Chemicals, Inc., using ethylidene norbornene as a diene component) was used in place of the polyolefin-based synthetic polymer used in Example 1. Was subjected to normal pressure hot air vulcanization, and vulcanization did not proceed, and a molded product could not be obtained.

Example 2 Dimethylsiloxane Unit 9
9.85 mol%, methyl vinyl siloxane unit 0.12
An organopolysiloxane consisting of 5 mol% and 0.025 mol% of dimethylvinylsiloxane units and having an average degree of polymerization of about 8,000, and azobisisobutyronitrile (AIBN) as a foaming agent were added to Example 1. Further, 0.5 parts of a chloroplatinic acid solution was used, extruded and crosslinked in the same manner as in Example 1, to obtain a sponge-like zipper type gasket. The cells of the sponge were uniform and dense.
In addition, the mold was foamed at 160 ° C. for 15 minutes to obtain a sponge-like gasket. The cell was uniform and dense, and the shape of the end was beautifully finished.

[0036]

[Table 1]

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a zipper type gasket according to one embodiment of the present invention, taken along line AA of FIG.

FIG. 2 is a plan view of the same example.

[Explanation of symbols]

 1 Gasket 2 Aluminum sash 3 Glass

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Sao Hirabayashi 1-10 Hitomi, Matsuida-cho, Usui-gun, Gunma Prefecture Inside Silicone Electronic Materials Research Laboratory, Shin-Etsu Chemical Co., Ltd. (72) Inventor Takeo Yoshida Usui-gun, Gunma Prefecture Matsuida-machi 1-chome Hitomi 10 Shin-Etsu Chemical Co., Ltd. Silicone Electronic Materials Technology Research Laboratory (72) Inventor Takashi Shirata 3rd Chigusa Kaigan, Ichihara-shi, Chiba Mitsui Chemicals Corporation (72) Inventor Yoshiharu Kikuchi Chiba-shi No. 3 Chikusa Beach, Hara-shi Mitsui Chemicals Co., Ltd. (72) Inventor Masaaki Kawasaki No. 3 Chikusa Beach, Ichihara-shi, Chiba F-term in Mitsui Chemicals Co., Ltd. F-term (reference) FD110 FD130 FD320 GJ00 GL00

Claims (4)

[Claims] (1) The non-conjugated polyene is represented by the following general formula [I] or [II]: (In the formula, n is an integer of 0 to 10, R ¹ is a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, and R ² is a hydrogen atom or an alkyl group having 1 to 5 carbon atoms. ) (In the formula, R ³ is a hydrogen atom or an alkyl group having 1 to 10 carbon atoms.) An ethylene / α-olefin / non-conjugated polyene random copolymer comprising at least one kind of norbornene compound having a terminal vinyl group represented by the following formula: 5 to 100 parts by weight of polymer rubber, (B) the following average composition formula (1) R ¹ _n SiO _{(4-n) / 2} (1) (wherein R ¹ represents an unsubstituted or substituted monovalent hydrocarbon group) And n is a positive number from 1.95 to 2.05.) 95 to 0 parts by weight of an organopolysiloxane represented by the following formula: (C) an organo having at least two hydrogen atoms bonded to a silicon atom in one molecule. Nohydrogenpolysiloxane An amount giving 0.2 to 5 hydrogen atoms bonded to silicon atoms per aliphatic unsaturated bond in the components (A) and (B). (D) Platinum group metal catalyst Characterized by containing For use gasket rubber composition. 2. A foaming agent is added to the components (A) to (D) in an amount of 0.5 to 100 parts by weight of the total of the components (A) and (B).
2. The rubber composition for a building gasket according to claim 1, comprising a sponge-like cured product of an olefin rubber composition containing up to 30 parts by weight. (A) The non-conjugated polyene is represented by the following general formula [I] or [II]: (In the formula, n is an integer of 0 to 10, R ¹ is a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, and R ² is a hydrogen atom or an alkyl group having 1 to 5 carbon atoms. ) (In the formula, R ³ is a hydrogen atom or an alkyl group having 1 to 10 carbon atoms.) An ethylene / α-olefin / non-conjugated polyene random copolymer comprising at least one kind of norbornene compound having a terminal vinyl group represented by the following formula: 5 to 100 parts by weight of polymer rubber, (B) the following average composition formula (1) R ¹ _n SiO _{(4-n) / 2} (1) (wherein R ¹ represents an unsubstituted or substituted monovalent hydrocarbon group) And n is a positive number from 1.95 to 2.05.) 95 to 0 parts by weight of an organopolysiloxane represented by the following formula: (C) an organo having at least two hydrogen atoms bonded to a silicon atom in one molecule. Nohydrogenpolysiloxane An amount giving 0.2 to 5 hydrogen atoms bonded to silicon atoms per aliphatic unsaturated bond in the components (A) and (B). (D) Platinum group metal catalyst Olefin rubber set containing Building gasket, characterized in that it consists of a cured product of the thing. 4. A foaming agent is further added to the components (A) to (D) in an amount of 0.5 to 100 parts by weight of the total of the components (A) and (B).
The architectural gasket according to claim 3, comprising a sponge-like cured product of an olefin rubber composition containing up to 30 parts by weight.