JPH0485352A - Vulcanizable rubber composition - Google Patents

Abstract

PURPOSE:To prepare the title compsn. giving a vulcanizate excellent in strength properties, resistance to heat, weather, oil, low temp., and dynamic fatigue, vibration-damping properties, etc., by using a blend of a specific chlorinated higher alpha1-olefin polymer rubber with a (hydrogenated) nitrile rubber in a specified ratio. CONSTITUTION:A blend of a chlorinated higher alpha1-olefin polymer rubber which contains 5-45wt.% Cl and is obtd. by chlorinating a higher alpha1-olefin polymer rubber comprising at least one higher alpha1-olefin unit selected from the group consisting of 6-12C alpha-olefins and having an intrinsic viscosity in decalin at 135 deg.C of 1-10dl/g (e.g. a chlorinated polyoctene rubber) with a (hydrogenated) nitrile rubber (e.g. Nipol 1042, a product of Nippon Zeon Co., Ltd.) in a wt. ratio of (5:95)-(95:5) is used.

Description

[Detailed Description of the Invention] [Industrial Fields of Application] The present invention provides strength properties, oil resistance, heat resistance, weather resistance, and properties suitable for anti-vibration rubber, rubber rolls, belts, tires, wiper blades, packings, hoses, etc. The present invention relates to a vulcanizable chlorinated α-olefin rubber composition having excellent vibration damping properties and dynamic fatigue resistance.

[Prior Art] Although chlorinated higher α-olefin polymer rubbers have excellent heat resistance, weather resistance, vibration damping properties, dynamic fatigue resistance, and cold resistance, they have poor strength properties, so improvements have been desired.

On the other hand, nitrile rubber or hydrogenated nitrile rubber has excellent strength properties, oil resistance, and abrasion resistance, so it is used in automobile parts,
It is widely used in industrial rubber products, civil engineering and construction materials, etc. However, nitrile rubber or hydrogenated nitrile rubber has insufficient vibration damping properties and dynamic fatigue resistance, making it unsuitable for specific uses, such as vibration-proof rubber, and improvements have been desired.

[Problems to be Solved by the Invention] The objects of the present invention are to improve strength characteristics, vibration damping properties, heat resistance, weather resistance,
The object of the present invention is to provide a vulcanizable rubber composition having excellent oil resistance and dynamic fatigue resistance.

[Means for Solving the Problems] According to the present invention, (A) decalin at 135°C, which is composed of one or more higher α1-olefin units selected from α-olefins having 6 to 12 carbon atoms; A chlorinated product of a high-grade α1-olefin polymer rubber having an intrinsic viscosity [η] of 1 to 10 dl/g and a chlorinated high-grade α1 polymer rubber having a chlorine content of 5 to 45% by weight. - Consisting of an olefin polymerized rubber and (B) product trile rubber or hydrogenated nitrile rubber,
The blending ratio or weight ratio of component (A) and component (B) is 5/9
5 to 9515 is provided.

The α1-olefin of component (A) is 1-hexene,
1-octene or 1-decene is preferred.

[Embodiments of the Invention] The chlorinated higher α1-olefin type Jli rubber (A) in the present invention is a chlorinated product of higher α1-olefin type polymer rubber.

The high-grade α1-olefin polymer rubber before chlorination is composed of one or more high-grade α,-olefin car units selected from α-olefins having 6 to 12 carbon atoms. Examples of higher α,-olefins include 1-hexene, 1-
Examples include octene and 1-decene.

Intrinsic viscosity measured in decalin at 135°C, which is an indicator of the molecular weight of high-grade α,-olefin polymer rubber before chlorination [
η] is from 1 to xodl/g, preferably from 2 to 9 d
l/g, more preferably 4 to 7 dl/g.

The higher α1-olefin polymer rubber before chlorination may contain other α-olefins in addition to the above-mentioned higher α1-olefin. Examples of other α-olefins include ethylene, propylene, 1-butene, and 4-methyl-1-pentene. The content of these other α-olefins is up to 5% relative to higher α-olefins.
It is 0 mol%.

Chlorinated high-grade α1-olefin polymer rubber (A) which is a chlorinated product of the above-mentioned high-grade α,-olefin polymer rubber
The chlorine content of is 5 to 45% by weight, preferably 5 to 35% by weight, more preferably 8 to 25% by weight.
Weight%. If the chlorine content exceeds 45% by weight, it will become hard and lack the flexibility typical of rubber.

On the other hand, if the amount is less than 5% by weight, problems such as not being able to obtain the desired oil resistance or not being able to obtain a practical vulcanization rate will occur.

Chlorination of the higher α,-olefin polymer rubber can be carried out by a known method. For example, a method in which high-grade α1-olefin polymer rubber is dissolved in a chlorine-stable solvent such as carbon tetrachloride, tetrachloroethylene, or chlorobenzene and brought into contact with molecular chlorine in a uniform solution state, or N- Chloracetamide, N-chlorsuccinimide,
1. This is done by uniformly kneading a chlorine compound such as 3-dichloro-55-dimethylhydantoin into high-grade α1-olefin polymer rubber using a roll or Banbury mixer, and then heating it to a temperature that liberates chlorine. Of these, chlorination in a solution state is particularly preferred. When carrying out the chlorination reaction in a solution state, it is more preferable to carry out the reaction in the presence of a radical initiator or under irradiation with ultraviolet rays or visible light because the reaction proceeds efficiently. The degree of chlorination can be adjusted by appropriately selecting the amount of molecular chlorine or other chlorinating agent, reaction time, reaction temperature, etc.

The nitrile rubber (B) used in the present invention is a copolymer containing butadiene and acrylonitrile as main components,
The acrylonitrile content is 10 to 45% by weight, and the Mooney viscosity [ML, Y (at 100°C)] is 20 to 100.

Further, the hydrogenated nitrile rubber (B) used in the present invention is obtained by hydrogenating the above rubber to have an iodine value of 2 to 40 (g/100g).
It refers to something that has been reduced to a level.

In the present invention, the above-mentioned nitrile rubbers and hydrogenated nitrile rubbers may be used alone or as a mixture.

The rubber composition of the present invention is obtained by blending the above-mentioned (A) component and the above-mentioned (B) component, but the blending ratio of the (A) component and (B) component used here is usually a weight ratio. (
A)/(B) from 5/95 to 9515, preferably 10
/90 to 90/10, more preferably 20/80 to 80/20.

When the weight ratio (^)/(B) is less than 5/95, vibration damping properties
Dynamic fatigue resistance is poor, and if it exceeds 9515, the problem arises that the strength does not reach the desired level.

Although the rubber composition of the present invention can be used in an unvulcanized state, its properties can be best exhibited when it is used as a vulcanized product. That is, the component (A) imparts vibration damping properties and dynamic fatigue resistance to the vulcanizate, and the component (B) imparts strength properties to the vulcanizate. As a result, the vulcanizate from the rubber composition of the present invention It has vibration damping properties, strength properties, dynamic fatigue resistance, and the heat resistance, weather resistance, and oil resistance that both wood types have, making it extremely useful in practice.

When obtaining a vulcanizate from the rubber composition of the present invention, component (A) and (B) are selected depending on the intended use, performance, etc. of the vulcanizate.
In addition to the ingredients, anti-aging agents, flame retardants, processing aids, anti-scorch agents, softeners, rubber reinforcing agents, fillers, etc. can be added.

The total amount of components (A) and (B) in the vulcanizate can be appropriately selected depending on the intended performance and use of the vulcanizate, but is usually 20% by weight or more, preferably 25% by weight or more.

In the present invention, if an anti-aging agent is used, the material life of the vulcanizate obtained from the rubber composition of the present invention can be extended. Such anti-aging agents include, for example, phenylnaphthylamine, N,N'-di-2-naphthyl-p
- Aromatic secondary amine stabilizers such as phenylene diamine, phenolic stabilizers such as dibutylhydroxytoluene, tetrabis[methylene(3,5-di-t-butyl-4-hydroxy)hydrocinnamate comethane] ,Screw[
Examples include thioether stabilizers such as 2-methyl-4-(3-n-alkylthiopropionyloxy)-5-t-butylphenylcosulfide, and dithiocarbamate stabilizers such as nickel dibutyldithiocarbamate. These anti-aging agents can be used alone or in combination of two or more. These anti-aging agents (
It is usually used in a proportion of 0.1 to 5 parts by weight, preferably 0.5 to 3 parts by weight, based on the total amount of component A) and component (B) ioo parts by weight.

As the flame retardant that can be used in the present invention, any flame retardant commonly used for plastics and rubber can be used, such as phosphorus-based flame retardants such as triphenyl phosphate; decabromodiphenyl ether, chlorinated polyethylene, and dechlorane plus 515. (Product name, manufactured by Marusho Sangyo Co., Ltd.)
, Planeron DB-100 (product name, manufactured by Mitsui Toatsu Fine Co., Ltd.), Bromrite BR-128F
(trade name, manufactured by Hitachi Chemical Co., Ltd.); antimony trioxide; inorganic flame retardants such as aluminum hydroxide commercially available under the trade name Hysilite H-40; and mixtures of the above flame retardants. can be exemplified. These flame retardants are appropriately selected depending on the intended use, but are usually blended in an amount of 50 parts by weight or less, preferably 30 parts by weight or less, based on 100 parts by weight of the total amount of components (A) and (B).

Processing aids that can be used in the present invention include those used in ordinary rubber processing, such as ricinoleic acid and its esters, higher fatty acids and their esters such as stearic acid, valmitic acid, and lauric acid, stearic acid Examples include salts of higher fatty acids such as barium, calcium stearate, and zinc stearate. These processing aids are generally used in an amount of 0.5 to 10 parts by weight, preferably 1 to 5 parts by weight, based on 100 parts by weight of the total amount of components (A) and (B).

Furthermore, in order to cope with various rubber processing steps, addition of compounds with oxymethylene structure and addition of scorch inhibitors can be recommended.

Examples of compounds having an oxyethylene structure include ethylene glycol, polyethylene glycol, propylene glycol, and polypropylene glycol. These compounds have a total amount of FA) component and (B) component of 100
Usually 2 to 10 parts by weight, preferably 3 parts by weight
It is added in a proportion of 5 to 5 parts by weight.

As the scorch inhibitor, a known scorch inhibitor can be used, and examples thereof include maleic anhydride, thioimide compounds, and sulfonamide compounds. These scorch inhibitors are usually used in an amount of 0.2 to 5 parts by weight, preferably 0.2 to 5 parts by weight, based on 100 parts by weight of the total amount of components (A) and (B).
．． It is used in a proportion of 3 to 3 parts by weight.

As the softener that can be used in the present invention, softeners commonly used for rubber can be used, such as process oil, lubricating oil, paraffin, liquid paraffin, petroleum asphalt,
Petroleum-based softeners such as Vaseline: Coal tar-based softeners such as coal tar and coal tar pitch; Fatty oil-based softeners such as castor oil, linseed oil, rapeseed oil, and coconut oil; Tall oil; Sub; Beeswax, carnauba wax , wax necks such as lanolin; fatty acids and fatty acid salts such as ricinoleic acid, palmitic acid, barium stearate, calcium stearate, and zinc laurate; synthetic polymeric substances such as petroleum resins, atactic polypropylene, and coumaron indene resins. I can do it. Among these, petroleum-based softeners are preferably used, and process oils are particularly preferred.

The blending amount of these softeners can be appropriately selected depending on the use of the vulcanizate, but the blending amount is usually at most 150 parts by weight, preferably at most 100 parts by weight of the total amount of components (A) and CB). is an amount of 100 parts by weight or less.

The rubber composition of the present invention includes SRF%GPF, FEF,
Carbon black such as HAF, 15AF%SAF, and FTSMT, rubber reinforcing agents such as finely divided silicic acid, and fillers such as light calcium carbonate, heavy calcium carbonate, talc, and clay may be blended. The type and amount of these rubber reinforcing agents and fillers can be selected as appropriate depending on the application, but the amount is usually at most 300 parts by weight per 100 parts by weight of the total amount of components (A) and (B). The amount is preferably 200 parts by weight or less.

In order to produce a vulcanizate from the rubber composition of the present invention, an unvulcanized compounded rubber is prepared once using the method described below, and then this compounded rubber is used as the intended compound. It can be manufactured by molding into a shape and then vulcanizing it. Vulcanization methods include a method of heating using a vulcanizing agent and a method of irradiating with an electron beam.

Examples of the vulcanizing agent used in the heating method using a vulcanizing agent include metal salts, sulfur compounds, triazine compounds, and organic peroxides.

As the metal salt, magnesium oxide, zinc stearate, zinc oleate, red lead, litharge, etc. are used.

The metal salt is usually 3 to 15 parts by weight, preferably 5 to 1 part by weight, based on 100 parts by weight of the total amount of components (A) and (B).
It is used in a proportion of 0 parts by weight.

Examples of the sulfur-based compound include sulfur, sulfur chloride, sulfur dichloride, morpholine disulfide, alkylphenol disulfide, tetramethylthiuram disulfide, and selenium dimethyldithiocarbamate, among which sulfur is preferably used. Sulfur-based compounds are (A)
0.0% per 100 parts by weight of the total amount of component and component (B).
It is used in an amount of 1 to 10 parts by weight, preferably 0.5 to 5 parts by weight.

Examples of the triazine compound include 2,4.6-trimercaptotriazine, 2-dibutylamino-4,6-dimercaptotriazine, and 2-phenylamino-4,6-dimercaptotriazine. When a triazine compound is used as a vulcanizing agent, it is possible to obtain a rubber that can withstand use under harsh conditions. Such a triazine compound is used in an amount of 1.0 g per 100 g of the total amount of components (A) and (B).
oxlO-3 to 2. It can be added at a ratio of 10-2 mol of Ox, preferably 2.5 x 10-3 to 1, 0-2 mol of OXl.

Examples of organic peroxides include dicumyl peroxide, 2.5-
Dimethyl-2,5-di(tert-butylperoxy)hexane, 2,5-dimethyl-2,5-di(benzoylperoxy)hexane, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane -3, di-tert-butyl peroxide, di-tert-butyl peroxy-3,3,5-trimethylcyclohexane, tert-butyl hydroperoxide, among others, dicumyl peroxide,
di-tert-butyl peroxide, di-tert-butyl peroxide
3,3,5-trimethylcyclohexane is preferably used. The organic peroxide is 3 x 10-' to 5 x t per 100 g of the total amount of components (A) and (B).
o-2 mol, preferably lXl0-3 to 3 X 10
- used in a proportion of 2 mol.

When using a sulfur compound as a vulcanizing agent, it is preferable to use a vulcanization accelerator in combination. As a vulcanization accelerator, N-cyclohexyl-2-benzothiazolesulfenamide, N
-oxydiethylene-2-benzothiazolesulfenamide, N,N-diisopropyl-2-benzothiazolesulfenamide, 2-mercaptobenzothiazole, 2-(2,4-dinitrophenyl)mercaptobenzothiazole, 2-(2 , 6-diethyl-4-morpholinothio)benzothiazole, dibenzothiazyl disulfide; guanidines such as diphenylguanidine, triphenylguanidine, diorthotolylguanidine, orthotolyl pi-guanide, diphenylguanidine phthalate; acetaldehyde −
Aniline reactant, butyraldehyde-aniline condensate,
Aldehyde amines or aldehyde-ammonia such as hexamethylenetetramine and acetaldehyde ammonia; imidacillins such as 2-mercaptoimidacillin; thiocarbamic acid, diethylthiourea, dibutylthiourea, trimethylthiourea, diorthotolylthiourea Thiourea series; Thiuram series such as tetramethylthiuram monosulfide, tetramethylthiuram disulfide, tetraethylthiuram disulfide, tetrabutylthiuram disulfide, pentamethylenethiuram tetrasulfide; zinc dimethyldithiocarbamate, zinc diethylthiocarbamate, di-n-butyldithiocarbamine Dithioate salts such as zinc acid, zinc ethyl phenyl dithiocarbamate, zinc butylphenyl dithiocarbamate, sodium dimethyl dithiocarbamate, selenium dimethyl dithiocarbamate, tellurium diethyldithiocarbamate; xanthate systems such as zinc dibutyl xanthate; zinc white, etc. can be given.

These vulcanization accelerators are used in an amount of 0.1 to 20 parts by weight, preferably 0.2 to 10 parts by weight, based on 100 parts by weight of the total amount of components (A) and (B).

When using a triazine compound as a vulcanizing agent, it is preferable to use a vulcanizing aid in combination. As a vulcanization aid, the acid dissociation constant (
An organic base having a pKa) of 7 or more or a compound capable of generating such a base can be used, specifically 1,8-diaza-bicyclo(5,4,0)-undecene-7, laurylamine, benzyl Amine, dibenzylamine, N-methylmorpholine, dicyclohexylamine, zinc dibutyldithiocarbamate, piperidine pentamethylenedithiocarbamate salt, N-cyclohexyl-2-benzothiazolylsulfenamide, dipentamethylenethiuram tetrasulfide, tetramethyl Onium salts such as thiuram disulfide, tetramethylphosphonium iodide, tetramethylammonium chloride, tetrabutylphosphonium bromide, and tetrabutylammonium bromide can be mentioned. These compounds are 5 x 10-' to 2 x per 100 g of the total amount of components (A) and (B).
10-2 mol, preferably lXl0-3 to lXl0
-2 moles are used.

When an organic peroxide is used as a vulcanization aid, it is preferable to use a vulcanization aid together. Examples of vulcanization aids include sulfur; quinone dioxime systems such as p-quinone dioxime; methacrylate systems such as polyethylene glycol dimethacrylate; allyl systems such as diallyl phthalate and triallyl cyanurate; other maleimide systems; divinylbenzene, etc. I can give an example. Such a vulcanization aid is used in a proportion of 0.5 to 2 moles, preferably about equimole, per mole of the organic peroxide used.

When electron beam irradiation is used as a vulcanization method, the molded unvulcanized compounded rubber described below is irradiated with 0.1 to 10 MeV (megaelectron volt), preferably 0.3 to 2 MeV.
Electrons having an energy of V may be irradiated so that the absorbed dose is 0.5 to 35 Mrad (megarad), preferably 0.5 to 10 Mrad. At this time, a vulcanization aid may be used in combination with the organic peroxide as the vulcanizing agent, and the amount thereof is lXl0-' to lXl0 per 100 g of the total amount of components (A) and (B). one'
It is used in a proportion of 1 x 10-3 to 3 x 10-2 mol.

The unvulcanized compounded rubber is prepared by the following method. That is, components (A) and (B), as well as anti-aging agents, flame retardants, processing aids, rubber reinforcing agents, fillers, softeners, etc., are added using a mixer such as a Banbury mixer, and the mixture is heated to 80 to 170 ml. After kneading for 3 to 10 minutes at a temperature of After kneading at 80° C. for 5 to 30 minutes, the mixture is separated to prepare a ribbon-like or sheet-like compounded rubber.

The compounded rubber thus prepared is molded into an intended shape using an extrusion molding machine, an injection molding machine, a calendar roll, or a press, and at the same time as the molding, or the molded product is introduced into a vulcanization tank and heated at 150 to 270°C. A vulcanizate can be obtained by heating at a high temperature for 1 to 30 minutes or by irradiating with an electron beam. This vulcanization step may be carried out using a mold or without a mold.

The vulcanizate produced as described above is widely used as it is in automobile parts, industrial rubber parts, electrical insulation materials, civil engineering and building materials, etc. In particular, it can be suitably used in applications requiring vibration damping properties and dynamic fatigue resistance, such as vibration-proof rubber, rubber rolls, belts, hoses, packing, and wiper plates.

Furthermore, when producing a foam from the composition of the present invention,
A foaming agent and, if necessary, a foaming aid can be added.

Foaming agents that can be blended include inorganic foaming agents such as sodium bicarbonate, sodium carbonate, ammonium bicarbonate, ammonium carbonate, ammonium nitrite, N,N'-dimethyl-N,N'-dinitroso terephthalamide, N,
Nitroso compounds such as N'-dinitroso pentamethylene tetramine; azo compounds such as azodicarboxamide, azobisisobutyronitrile, azocyclohexylnitrile, azodiaminobenzene, barium azodicarboxylate; benzenesulfonyl hydrazide, Toluenesulfonylhydrazide, p,p'-oxybis(benzenesulfonylhydrazide), diphenylsulfone-
Examples include sulfonyl hydrazide compounds such as 3,3'-disulfonyl hydrazide; azide compounds such as calcium azide, 4,4'-diphenyldisulfonyl azide, and p-toluenesulfonyl azide. Among them, nitroso compounds, azo compounds and azide compounds are preferably used. Such a blowing agent is blended in an amount of 0.5 to 30 parts by weight, preferably 1 to 20 parts by weight, per 100 parts by weight of the total amount of components (A) and (B), so that the apparent specific gravity is 0. 0.03 to 0.7 foam can be produced.

Further, a foaming aid may be used in combination with a foaming agent if necessary. A foaming aid is an additive that functions to lower the decomposition temperature of a foaming agent, promote decomposition, and make cells uniform. Examples of foaming aids include organic acids such as salicylic acid, phthalic acid, and stearic acid; urea and its derivatives.

Foams produced from the rubber composition of the present invention are useful as heat insulating materials, flotation materials, cushioning materials, sound insulation materials, and the like.

In the present invention, the reason why the strength characteristics, vibration damping properties, and dynamic fatigue resistance of the rubber composition are improved is not clear, but the strength characteristics, vibration damping properties, and dynamic fatigue resistance of the rubber composition are improved due to the relaxation behavior specific to the chlorinated higher α1-olefin polymer rubber of component (A). It is presumed that the nitrile rubber or hydrogenated nitrile rubber of component (B) exhibits vibration properties and strength characteristics.

[Effects of the Invention] According to the present invention, the weight ratio of component (A) of a specific chlorinated higher α1-olefin polymer rubber to component (B) of nitrile rubber or hydrogenated nitrile rubber is in the range of 575. As a result of the blending, a vulcanizable rubber composition having excellent physical properties such as strength properties, heat resistance, weather resistance, oil resistance, cold resistance, dynamic fatigue resistance, and vibration damping properties can be obtained by vulcanization.

[Example] Examples of the present invention will be described below.

Example 1 First, polyoctene rubber was polymerized by a known method. The intrinsic viscosity [η] of this polyoctene rubber measured in decalin at 135°C was 6.0 dl/g. Furthermore, this polyoctene rubber was chlorinated by a known method and subjected to a test as a chlorinated polyoctene rubber (A1). This chlorinated polyoctene rubber had a chlorine content of 15% by weight. In addition, as nitrile rubber (B), commercially available Nirapol 1
042 (manufactured by Nippon Zeon Co., Ltd., trade name) (81), and these were blended at the blending ratios shown in Table 1.

Table 1 1) Product name: Asahi 60: Manufactured by Asahi Carbon 2) Dioctyl phthalate:
Manufactured by Hiroshima Wako 3) Product name: ZISNET-DB:
When compounding Sanbe Kasei ■, first, chlorinated polyoctene rubber (AI), nitrile rubber (Bl), stearic acid, magnesium oxide, FEF carbon, and DOP are added.
．． 6 with 3j2 Banbury mixer (manufactured by Kobe f14m)
The mixture was kneaded for 1 minute and left at room temperature for 1 day.

Next, with a 14-inch oven roll, add 2-
Dibutylamino-4,6-dimercaptotriazine, benzoic acid/piperidine (1/1) salt/tetrabutylammonium bromide were added.

The mixing time with the open roll was 4 minutes, the surface temperature of the open roll was 60°C for the front roll, and 70°C for the rear roll, and the rotation speed was 16 rpm for the front roll and 18 rpm for the rear roll.

This compounded rubber was formed into a sheet, press-vulcanized at 160° C. for 20 minutes, and then subjected to a test. The test items are as follows.

Tensile test, hardness test, aging test, bending test, vibration damping, oil resistance, cold resistance.

Tensile test, hardness test, aging test, and bending test are JIS K
Measured according to 8301. In other words, tensile strength (TB) and elongation (Ea) are determined in the tensile test, H, and elongation (Ea) are determined in the hardness test.
The JIS^ hardness was measured, and the aging test was conducted by air heating at 150 tons for 70 hours. After the aging test, a tensile test was conducted to determine the retention of physical properties before aging, that is, tensile strength retention AR (TB) and elongation retention AR (EB).

The bending test was performed using a dematcher testing machine to examine resistance to crack growth. That is, the number of bending times until the crack became 15 mm was measured.

As an index of damping performance, loss tangent (tan δ) was measured at 30° C. and 100 rad/sec using a dynamic spectrometer manufactured by Rheometric. Oil resistance is 10 to JIS B oil according to JIS K6301.
It was immersed at 0° C. for 70 hours, and the swelling ratio (ΔV) was determined.

As an index of cold resistance, the temperature at T5 of the Gehman torsion test was determined.

The results are shown in Table 2.

Example 2 In Example 1, chlorinated polyoctene rubber (A,) 5
Examples except that 80 parts by weight of chlorinated polyoctene rubber (A,) and 20 parts by weight of nitrile rubber (81) were blended instead of blending 0 parts by weight and 50 parts by weight of nitrile rubber (a,). It was carried out in exactly the same manner as 1.

The results are shown in Table 2.

Example 3 In Example 1, chlorinated polyoctene rubber (A,) 5
Except that 20 parts by weight of chlorinated polyoctene rubber (A,) and 80 parts by weight of nitrile rubber (B,) were blended instead of blending 0 parts by weight and 50 parts by weight of nitrile rubber (B,). It was carried out in exactly the same manner as in Example 1.

The results are shown in Table 2.

Comparative Example 1 In Example 1, chlorinated polyoctene rubber (AI) 5
The same procedure as in Example 1 was carried out, except that instead of blending 0 parts by weight and 50 parts by weight of nitrile rubber (B), 100 parts by weight of chlorinated polyoctene rubber (AI) was blended.

The results are shown in Table 2.

Comparative Example 2 In Example 1, chlorinated polyoctene rubber (AI)s
Example 1 was repeated except that 100 parts by weight of nitrile rubber (81) was blended instead of 50 parts by weight of nitrile rubber (B+).

The results are shown in Table 2.

Example 4 In Example 1, chlorinated polyhexene rubber (AI) having the following properties was used instead of chlorinated polyoctene rubber (AI).
The same procedure as in Example 1 was carried out except that A2) was used.

Chlorinated polyhexene rubber (A2) Intrinsic viscosity of polyhexene rubber before chlorination [ηkoni 5.
5dl/g Chlorine content-=15% by weight The results are shown in Table 2.

Example 5 In Example 1, chlorinated polydecene rubber (A1) having the following properties was used instead of chlorinated polyoctene rubber (A1).
The same procedure as in Example 1 was carried out except that 3) was used.

Chlorinated polydecene rubber (A3) Intrinsic viscosity of polydecene rubber before chlorination [η]: 6. O
dl/g Chlorine content 212% by weight The results are shown in Table 2.

Example 6 In Example 1, instead of nitrile rubber (B1),
The procedure was carried out in exactly the same manner as in Example 1, except that hydrogenated nitrile rubber, Z Ball 2020 (manufactured by Nippon Zeon Co., Ltd., trade name) (B2) was blended.

The results are shown in Table 2.

Comparative Example 3 In Example 6, chlorinated polyoctene rubber (A,) 5
The procedure was carried out in the same manner as in Example 1, except that 100 parts by weight of hydrogenated nitrile rubber (B2) was blended instead of blending 0 parts by weight and 50 parts by weight of hydrogenated nitrile rubber (B2).

The results are shown in Table 2.

Claims (2)

[Claims] (1) (A) Consists of one or more higher α_1-olefin units selected from α-olefins having 6 to 12 carbon atoms, and has an intrinsic viscosity [η] of 1 to 1 when measured in decalin at 135°C. High-grade α_1 in the range of 10 dl/g
- A chlorinated product of olefin polymer rubber, with a chlorine content in the range of 5 to 45% by weight, chlorinated high-grade α_1-
Consisting of olefin polymerized rubber and (B) nitrile rubber or hydrogenated nitrile rubber,
The mixing ratio of component (A) and component (B) is 5/9 by weight.
5 to 95/5. (2) The vulcanizable rubber composition according to claim (1), wherein the α_1-olefin of component (A) is 1-hexene, 1-octene or 1-decene.