JPS6253352A - Novel rubber composition - Google Patents

Abstract

PURPOSE:To obtain a rubber composition having excellent gasoline resistance, gasohol resistance and heat-resistance, etc., and good processability and useful as a fuel hose of automobile,by compounding a specific rubbery copolymer with a vinylidene fluoride resin and other resin at specific ratios. CONSTITUTION:The objective composition can be produced by compounding (A) 95-40(wt)% rubbery copolymer composed of one or more components selected from (A1) a multi-component copolymer composed of (i) 30-99.9% alkyl acrylate and/or alkoxy-substituted alkyl acrylate, (ii) 0.1-10% crosslinking monomer and (iii) 0-70% other ethylenic unsaturated compound copolymerizable with the components (i) and (ii), (A2) a multi-component copolymer composed of (iv) 10-60% alpha,beta-unsaturated nitrile, (v) 15-90% conjugated diene and (vi) 0-75% other ethylenic unsaturated compound copolymerizable with the components (iv) and (v), and (A3) hydrogenated component A2, with (B) 5-60% vinylidene chloride resin and (C) 3-55% other resin copolymerizable with the components A and B (e.g. vinyl chloride resin).

Description

DETAILED DESCRIPTION OF THE INVENTION a. Industrial Application Field The present invention is directed to a vulcanized material having excellent gasoline resistance, gasohol resistance, sour gasoline resistance, sour gasohol resistance, and heat resistance, as well as excellent processability. Regarding possible rubber compositions.

b. Conventional technology In recent years, the atmosphere in which parts made of gasoline-resistant rubber are used in automobiles has tended to become increasingly hot as a result of exhaust gas control measures and engine improvements aimed at improving performance. There is a need for gasoline (oil) resistant rubber with excellent heat resistance.

In addition, gasoline is further oxidized to produce sour gasoline (gasoline that is oxidized and contains peroxide. For details, refer to 8. Nersasian: l
? uberand Plastics News J
Described in une26 (1978). ) occurs, causing the problem of deterioration of the rubber.

Furthermore, due to the tight global supply and demand for crude oil, attempts have been made to mix alcohol with gasoline.

This alcohol-mixed gasoline (gasohol) also has the problem of being oxidized like normal gasoline, producing sour gasohol, which deteriorates rubber.

Conventionally, butadiene-acrylonitrile rubber has been widely used as a gasoline-resistant rubber for applications such as hoses, gaskets, O-rings, packings, and oil seals.

C1 Problems to be solved by the invention However, butadiene-acrylonitrile rubber has the following problems:
Since the heat resistance is poor and the sour gasoline resistance is also insufficient, it is difficult to obtain rubber parts that have sufficient reliability in φR properties in an environment where they come into contact with gasoline at high temperatures as described above.

As a method to improve this, it is known that the sour gasoline resistance and ozone resistance are improved by using a blend of butadiene-acrylonitrile rubber and polyvinyl chloride (Japanese Patent Laid-Open No. 1983-1979-1). No. 89838), the heat resistance is not improved and the gasohol resistance is also not sufficient.

It is also known that hydrogenation of butadiene-acrylonitrile rubber improves sour gasoline resistance and heat resistance (Japanese Unexamined Patent Publication No. 70135/1982). According to this, the compression set becomes poor, and the heat resistance, sour gasoline resistance, and sour gasohol resistance are also not sufficient.

d. Means to Solve the Problems The inventors of the present invention have made extensive studies to obtain a rubber material that is excellent in gasoline resistance, gasohol resistance, sour gasoline resistance, and sour gasohol resistance, and is also heat resistant. A rubber composition (α) consisting of one type or a mixture of two or more of the following:
and vinylidene fluoride resin (β) and other resins (r)
The rubber composition composed of a mixture of The present invention was achieved based on the discovery that it has a good balance between elongation, gasoline resistance, and cold resistance, and also has excellent processability.

That is, the present invention provides (8) acrylic acid alkyl ester acrylic acid alkoxy-substituted alkyl ester compound 30
~99.9%, (B) 0.1 to 10% by weight of crosslinked polymer, and (C
) A multicomponent copolymer (1), (D) α having a polymer composition of 0 to 70% by weight of another ethylenically unsaturated compound copolymerizable with the above (A) and (B).
, β-unsaturated nitrile 10-60% by weight, (E) conjugated diene 15-90% by weight, and (F) the above (D), (
E) Other ethylenically unsaturated compounds copolymerizable with 0-7
5% by weight, one or more rubbery copolymers (α) selected from a multicomponent copolymer (II) and a hydride (III) of a multicomponent copolymer (II) having a polymerization composition of Contains vinylidene fluoride resin (β) and other resins (γ) that can be blended with these (α) and (β), and (α) is 95 to 40.
The present invention provides a rubber composition characterized in that (β) is 5 to 60 weight % and (T) is 3 to 55 weight %.

The multicomponent copolymer rubber (1) used in the present invention is (A)
, (B) and (C), but the above (8)
The component acrylic acid alkyl ester is the following general 1 and 1.
? H2C=C-C-0-R1
(i), such as methyl acrylate, ethyl acrylate, n-propyl acrylate, n-butyl acrylate, isobutyl acrylate, n-pentyl acrylate, isoamyl acrylate, n-hexyl acrylate, 2-methylpentyl acrylate, n-octyl acrylate, 2-
Examples include ethylhexyl acrylate, n-decyl acrylate, n-dodecyl acrylate, n-octadecyl acrylate, and preferably methyl acrylate, ethyl acrylate, n-propyl acrylate, n-
-butyl acrylate, particularly preferably methyl acrylate and ethyl acrylate.

In addition, the alkoxy-substituted acrylic acid alkyl ester of the component (8) has the following general formula (ii) ozc
= C-C-0-Rz-0-Rs
(ii), such as 2-methoxyethyl acrylate, 2-ethoxyethyl acrylate, 2-(n-propoxy)ethyl acrylate, 2-methoxyethyl acrylate,
-(n-butoxy)ethyl acrylate, 3-methoxypropyl acrylate, 3-ethoxypropyl acrylate, 2-(n-propoxy)propyl acrylate),
Examples include 2-(n-butoxy)propyl acrylate, preferably 2-methoxyethyl acrylate,
2-ethoxyethyl acrylate, particularly preferably 2-methoxyethyl acrylate.

The crosslinkable monomer, which is the component (B) of the copolymer (I), is a monomer that can introduce a crosslinked structure into the resulting copolymer by copolymerizing, and includes, for example, a diene compound. , dihydrodicyclopentadienyl group-containing (
At least one compound selected from the group of meth)acrylic acid esters, epoxy group-containing ethylenically unsaturated compounds, active halogen-containing ethylenically unsaturated compounds, and carboxyl group-containing ethylenically unsaturated compounds can be mentioned.

Among the crosslinkable monomers of component (B), diene compounds include non-conjugated dienes such as alkylidenenorbornene, alkenylnorbornene, dicyclopentadiene, methylcyclopentadiene and dimers thereof, and conjugated dienes such as butadiene and isoprene. The diene is preferably a non-conjugated diene selected from the group consisting of alkylidenenorbornene, alkenylnorbornene, dicyclopentadiene, methylcyclopentadiene and dimers thereof.

Among the crosslinking monomers of the component (B), dihydrodicyclopentadienyl group-containing (meth)acrylic acid esters include dihydrodicyclopentadienyl (meth)acrylate, dihydrodicyclopentajenyloxyethyl (Meth)acrylate is preferred.

Furthermore, among the compounds of component (8), the epoxy group-containing ethylenically unsaturated compound is preferably allyl glycidyl ether, glycidyl methacrylate, or glycidyl acrylate.

Furthermore, among the compounds of component (B), specific examples of active halogen-containing ethylenically unsaturated compounds include vinylbenzyl chloride, dinylbenzyl bromide, 2-
Chlorethyl vinyl ether, vinyl chloroacetate, vinyl chloropropionate, allyl chloroacetate, allyl chloropropionate, 2-chloroethyl acrylate, 2-chloroethyl methacrylate, chlormethyl vinyl ketone, 2-chloroacetoxymethyl-5
-Norbornene, among others, vinyl chloroacetate, 2-chloroethyl vinyl ether,
Vinylbenzyl chloride, 2-chloroethyl methacrylate, and 2-chloroethyl acrylate are preferred.

Furthermore, among the compounds of the component (B), specific examples of carboxyl group-containing ethylenically unsaturated compounds include:
Examples include acrylic acid, methacrylic acid, crotonic acid, 2-pentenoic acid, maleic acid, fumaric acid, and itaconic acid.

As the other ethylenically unsaturated compound of component (C), various compounds can be used as necessary, but
Examples include carboxyl group-containing compounds such as acrylic acid, methacrylic acid, crotonic acid, 2-pentenoic acid, maleic acid, fumaric acid, and itaconic acid; methacrylates such as methyl methacrylate and octyl methacrylate;
Cyano-substituted alkyl (meth)acrylates such as 2-cyanoethyl acrylate, 3-cyanopropyl acrylate, 4-cyanobutyl acrylate, amino-substituted alkyl (meth)acrylates such as diethylaminoethyl acrylate, 1,1.1-trifluoroethyl acrylate Fluorine-containing acrylates such as, hydroxyl-substituted alkyl (meth) such as hydroxyethyl acrylate
Acrylates, alkyl vinyl ketones such as methyl vinyl ketone, vinyl or allyl ethers such as vinyl ethyl ether, allyl methyl ether, styrene, alpha
- Vinyl aromatic compounds such as methylstyrene, chlorostyrene, vinyltoluene, vinyl nitriles such as acrylonitrile and methacrylonitrile, acrylamide,
Examples include vinylamides such as methacrylamide and N-methylolacrylamide, and ethylene, propylene, vinyl chloride, vinylidene chloride, vinyl fluoride, vinylidene fluoride, vinyl acetate, and alkyl fumarates. Among these, acrylonitrile, 2-cyanoethyl acrylate, ethylene, and vinyl acetate are preferred, and acrylonitrile is particularly preferred.

A preferred combination of component (A) and component (C) is an acrylic acid alkyl ester and/or component (A).
or a combination in which the acrylic acid alkoxy-substituted alkyl ester compound is at least one compound selected from the group of methyl acrylate, ethyl acrylate, and methoxyethyl acrylate, and the other ethylenically unsaturated compound of component (C) is acrylonitrile. It is.

(A) and (B) in the multicomponent copolymer rubber (1) of the present invention
) and (C) component is (A) component 30-9
9.9% by weight, 0.1-10% by weight of component (B) and (
C) component is 0 to 70% by weight. .

If the amount of component (A) is less than about 30% by weight, the ordinary physical properties such as tensile strength and elongation of the multi-component copolymer rubber will be poor, which is not preferable. It is preferably 50% by weight or more, particularly preferably 70% by weight or more.

Furthermore, if the component (B) is less than about 0.1% by weight, it will take a long time to crosslink the multi-component copolymer rubber, while if it exceeds 10% by weight, the rubber will become hard and the elongation of the crosslinked rubber will decrease. I don't like it. Preferably it is 1 to 7% by weight, more preferably 2 to 5% by weight.

Furthermore, if the amount of component (C) exceeds about 70% by weight, (
A) It is not preferable because the amount of the component is too small.

The multi-component copolymer rubber (1) can be produced by emulsion polymerization using a conventional radical polymerization catalyst.

Next, the multicomponent copolymer rubber (II) used in the present invention is (
D), (E) and (F) components, but the above (
D) Component α,β-unsaturation As an example of trill for unsaturation,
Acrylonitrile, α-chloroacrylonitrile, α-
Examples include fluoroacrylonitrile, methacrylaterile, and ethacrylonitrile, among which acrylonitrile is particularly preferred.

The conjugated diene that is the component (E) includes butadiene-1,3,2-chlorobutadiene-1,3,2-methylbutadiene-1,3, among which butadiene-1,3 is preferred.

As the component (F), various compounds can be used as required, examples of which include methyl acrylate, ethyl acrylate, n-propyl acrylate, n-butyl acrylate, isobutyl acrylate, and n-pentyl acrylate. , acrylic acid alkyl esters such as isoamyl acrylate, n-hexyl acrylate, 2-methylpentyl acrylate, n-octyl acrylate, 2-ethylhexyl acrylate, n-decyl acrylate, n-dodecyl acrylate, n-octadecyl acrylate, 2 -methoxyethyl acrylate, 2-ethoxyethyl acrylate, 2-
(n-propoxy)ethyl acrylate, 2-(n-butoxy)ethyl acrylate, 3-methoxypropyl acrylate, 3-methoxypropyl acrylate, 2-
(n-propoxy)propyl acrylate, 2-(n-
acrylic acid alkoxy-substituted alkyl esters such as (butoxy) propyl acrylate, methyl methacrylate,
Methacrylic acid alkyl esters such as octyl methacrylate, alkyl vinyl ketones such as methyl vinyl ketone, vinyl or allyl ethers such as vinyl ethyl ether, allyl methyl ether, vinyl aromatics such as styrene, α-methylstyrene, chlorostyrene, vinyltoluene, etc. Compounds, carboxyl group-containing compounds such as acrylic acid, methacrylic acid, crotonic acid, 2-pentenoic acid, maleic acid, fumaric acid, itaconic acid, 1゜1-dihydroperfluoroethyl (meth)acrylate, 1.1-
dihydroperfluoropropyl (meth)acrylate,
i, 1,5-1-lihydroberfluorohexyl (meth)acrylate, l.

1.2.2-Tetrahydroperfluoropropyl (meth)acrylate, 1.1. -'7-) Lihydroberfluoroheptyl (meth)acrylate, ■.

Fluorine-containing acrylic esters such as dihydroperfluorooctyl (meth)acrylate and 1,1-dihydroperfluorodecyl (meth)acrylate, epoxy group-containing compounds such as allyl glycidyl ether, glycidyl methacrylate, and glycidyl acrylate, vinylbenzyl chloride, vinyl Benzyl chloride, 2-chloroethyl vinyl ether, vinyl chloroacetate, vinyl chloropropionate, chloroethyl vinyl ether,
Allyl chloropropionate, 2-chloroethyl acrylate, 2-chloromethyl methacrylate, chloromethyl vinyl ketone, 2-chloroacetoxymethyl-5-
Active halogen-containing compounds such as norbornene, hydroxyl group-containing compounds such as l-hydroxypropyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, hydroxyethyl (meth)acrylate, dimethylamino (meth)acrylate, diethylaminoethyl (
Methane acrylate, cyphthylaminoethyl (meth)
Examples include tertiary amino group-containing monomers such as acrylates, vinylamides such as acrylamide, methacrylamide, and N-methylolacrylamide, and ethylene, propylene, vinyl chloride, vinylidene chloride, and alkyl fumarates. Among these, (meth)acrylic acid esters are particularly preferred.

(D), (E) in the multicomponent copolymer rubber (n) of the present invention
) and (F) component is (D) component 10-6
0% by weight, 15 to 90% by weight of component (E) and 0 to 75% by weight of component (F).

If the amount of component (A) is less than 10% by weight, the oil resistance of the composition will deteriorate, which is not preferable.

Furthermore, if the content of component (D) exceeds 60% by weight, the processability of the composition deteriorates, which is not preferable. Preferably it is 20 to 50% by weight.

If the amount of component (E) is less than 15% by weight, the cold resistance of the composition will deteriorate, which is not preferable. The content is preferably 30% by weight or more, particularly preferably 50% by weight or more.

Furthermore, when the component (F) exceeds about 75% by weight, (
D) and (E) components are too small, which is not preferable.

Preferably it is 25% by weight or less.

The multi-component copolymer rubber (n) can be produced by emulsion polymerization using a conventional radical polymerization catalyst.

The above hydride (I[[) is a hydride of a multicomponent copolymer rubber (■), and the degree of hydrogenation of the conjugated diene unit in the polymer chain is 10% or more, preferably 30% or more,
Particularly preferably, it is 50% or more.

The hydride (III) can be produced by emulsion polymerization or solution polymerization.
The conjugated diene unit portion in the rubber is hydrogenated by the method described in No. 71681, GB2070023, etc.

When the hydride (III) of the multicomponent copolymer rubber (II) is used in the rubber composition of the present invention, the multicomponent copolymer rubber (
Compared to n), it has excellent cold resistance, heat resistance, gasoline resistance, gasohol resistance, sour gasoline resistance, and sour gasohol resistance.

Next, vinylidene fluoride resin (β) used in the present invention
is polyvinylidene fluoride and vinylidene fluoride with hexafluoropropene, pentafluoropropene, trifluoroethylene, trifluorochloroethylene, tetrafluoroethylene, vinyl fluoride, perfluoro(methyl vinyl ether), perfluoro(propyl vinyl ether), It is a copolymer of one or more of vinyl acetate, ethylene, propylene, butadiene, styrene, or acrylic acid ester, and its vinylidene fluoride content is 90 mol% or more, preferably 95 mol% or more. A vinylidene fluoride resin having a vinylidene fluoride content of less than 90 mol % is unfavorable in terms of gasoline resistance, gasohol resistance, sour gasoline resistance, and sour gasohol resistance. Furthermore, vinylidene fluoride resin is
Although not particularly limited, the degree of polymerization is preferably 100 to 10.
A value of 0.000 is used.

Next, other resins (γ) that can be blended with (α) and (β) used in the present invention include phenolic resins, melamine resins, urea resins, unsaturated polyester resins, epoxy resins, allyl resins, and silicone resins. thermosetting resins such as polyethylene, polyvinyl chloride, polypropylene, polystyrene, ABS resin, acrylic resin, polyamide resin, polyester resin, polycarbonate resin, polyether resin, polyacetal resin, or two of these resins. Mixtures of more than one species are mentioned, and polyvinyl chloride is particularly preferred.

As described above, the rubber composition of the present invention contains one or more types selected from the multi-component copolymer rubber (1) (II) or the hydride (II[) of the multi-component copolymer rubber (II). A rubber composition (α) consisting of a mixture of
) (γ) Each weight fraction is (α) 95 to 40% by weight, (β) 5 to 60% by weight r) 3 to 55% by weight
It is.

Ru.

If the weight fraction of the rubber composition (α) is less than 40% by weight, the elongation of the rubber composition will decrease and the hardness will increase too much, which is undesirable. be.

If the vinylidene fluoride resin (β) is less than 5% by weight, the effect of improving gasohol resistance, heat resistance, and sour gasoline resistance will not be observed, and the content is preferably 10% by weight or more. As the amount of vinylidene fluoride resin (β) in the mixture increases, processability deteriorates and costs increase, so the upper limit of the amount used is determined naturally, and is usually 60% by weight or less, preferably 50% by weight or less. be. Particularly preferably, it is 40% by weight or less.

Further, if the other resin component (γ) is less than 3% by weight, processability deteriorates and costs increase, which is not preferable. (
When the γ) component exceeds 55% by weight, the (α) component and the (β) component become too small, which is not preferable.

The ratio of each component in the rubber composition of the present invention to the rubber composition (α), vinylidene fluoride resin (β), and other resin (γ) that can be blended with these may be determined depending on the purpose of use and required performance. It can be determined as appropriate within the above range.

The method of mixing the composition of the present invention is not particularly limited, but for example, the following method can be used.

(a) Rubber composition (α) and vinylidene fluoride resin (β)
and other resin (γ) in a roll, Banbury mixer.
, a method of mixing using a mixer such as an intermixer, (b) rubber composition (α) and vinylidene fluoride resin (β)
and other resins (γ) in latex or suspension form, and then coagulate and co-precipitate;
or (c) a method of using the above (a) and (b) in combination.

The method for producing the rubber composition of the present invention is not particularly limited, but
For example, the following method can be used.

Carbon black is mixed in advance with the rubber composition (α) using a mixer such as a roll, Banbury mixer, or intermixer, and then vinylidene fluoride resin (β) is mixed with the rubber composition (α).
) and other resins (γ) at high temperature, specifically 150
Examples include a method of mixing at ~250°C, preferably 150-200°C.

If the mixing temperature exceeds 250°C, the rubber deteriorates, which is undesirable. If the mixing temperature is less than 150°C, the blended state will be insufficient and the physical properties will deteriorate. The crosslinking agent is added after the blend has cooled.

The rubber composition of the present invention contains ordinary compounded chemicals such as reinforcing agents, fillers, plasticizers, mold release agents, softeners, stabilizers, etc. Among these, the plasticizer is polyether ester. Adipic acid derivatives, phosphoric acid derivatives, and the like are preferably used. These additives are added to the rubber composition (α) in advance.
It is also possible to mix the rubber composition (α) with the vinylidene fluoride resin (β) and other resins (γ) by the method described above. ) can also be blended after mixing.

A crosslinked product can be easily obtained from the rubber composition of the present invention by a normal crosslinking method.

As the crosslinking agent to be used, a suitable compound can be selected depending on the type of functional group used for crosslinking introduced into the multi-component copolymer rubber.

For example, when copolymerizing a diene compound or a (meth)acrylic acid ester containing a dihydrodicyclopentadiene group, a so-called vulcanizing agent such as a carbon-carbon double bond or a general diene such as an organic peroxide may be used. Crosslinking agents used in rubbers (styrene-butadiene rubber, isoprene rubber, etc.) can be suitably used.

In addition, when an epoxy group-containing ethylenically unsaturated compound is copolymerized and an epoxy group is introduced into a multicomponent copolymer rubber, polyamine carbamates, ammonium carboxylates, dithiocarbamates, organic carboxylic acid alkali A combination of metal salts and sulfur compounds can be used.

Furthermore, when an active halogen-containing ethylenically unsaturated compound is copolymerized into a multi-component copolymer and an active halogen group is introduced, polyamine carbamates, ammonium organic carboxylic acids, alkali metal salts of organic carboxylic acids and sulfur Combinations of compounds can be suitably used.

e. Examples Hereinafter, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited to these Examples unless the gist thereof is exceeded.

Examples 1 to 5, Comparative Examples 1 to 4 For each sample of the blend composition of the multi-component copolymer rubber shown in the upper row of Table 2, polyvinylidene Vide (hereinafter referred to as "Pv Kano") and polyvinyl chloride, the table below shows Blending was carried out using a Banbury mixer according to the blending recipe shown in -1. The resulting mixture was pre-cured according to the conditions shown in the upper row of Table 1.

The properties of the obtained crosslinked rubber were measured according to JIS 6301. In addition, sour gasoline resistance and sour gasohol resistance were evaluated by the following methods.

2.5 g of sour gasoline resistant lauroyl peroxide was added to Fuel C (
A test piece was placed in a solution of 97.5 g of isooctane:toluene (mixed solvent of 1:1 (volume ratio)) at 40℃.
A period of immersion was defined as one cycle, and a test piece was taken out after each cycle. After drying under reduced pressure at 100° C. for 15 hours, the test piece was bent 180 degrees and the state of crack generation was observed.

Instead of sour gasohol-based Fuel C, use a mixed solvent of Fuel C and ethanol (volume ratio, Fuel C: ethanol = 80
: 20) was used, but the evaluation was carried out in the same manner as the evaluation of sour gasoline resistance.

The evaluation results are shown in the lower part of Table 2.

From the results in Table 2, the vulcanized rubber composition of the present invention has excellent gasoline resistance, gasohol resistance, sour gasoline resistance, sour gasohol resistance, and heat resistance, as well as tensile strength and
It can be seen that a vulcanized rubber composition with an excellent balance of elongation, gasoline resistance and cold resistance can be provided.

In addition, in Table 2, $1) Polyvinylidene fluoride: JSR manufactured by Pennwalt Co., Ltd.
KYNAR731 *2) Vinylidene fluoride (91 mol%)/hexafluoropropylene (4 mol%)/tetrafluoroethylene (
5 mol%) Copolymer resin *3) Degree of hydrogenation 90% Book 4) NC: No cracks 5) 10 inch roll with roll surface temperature 60°C
The winding property was visually evaluated after winding for a minute.

◎-----Very good o-----Good x--Bad f9 Effects of the invention The rubber composition of the present invention has gasoline resistance, sour gasoline resistance, It has excellent compression set resistance and heat resistance, and also has excellent gasohol resistance and sour gasohol resistance, which are new requirements.It also has good tensile strength, elongation, and cold resistance, so it can be used as a fuel for automobiles. Including system hoses, various hoses that come into contact with fuel oil, hydraulic oil, lubricating oil, etc., various sealing materials such as diaphragms, gaskets, O-rings, oil seals, and for steel manufacturing, spinning, printing, and paper manufacturing. It can be used for various types of rolls that require oil resistance and solvent resistance, such as those used for industrial and dyeing purposes, power transmission belts such as timing belts, conveyor belts, tensioners, oil dampers, etc. Taking advantage of its particularly excellent resistance to sour gasoline and sour gasohol, it can be suitably used as a rubber for automobile fuel system hoses.

Claims (2)

[Claims] (1) (A) Acrylic acid alkyl ester and/or acrylic acid alkoxy-substituted alkyl ester compound 30-9
9.9% by weight, (B) crosslinkable monomer 0.1-10% by weight, and (C
) 0 to 70% by weight of another ethylenically unsaturated compound copolymerizable with the above (A) and (B); (I); (D) α,β-unsaturated nitrile; 10-60% by weight, (E
) conjugated diene 15 to 90% by weight, and (F) the above (D
), 0 to 75% by weight of other ethylenically unsaturated compounds copolymerizable with (E), from a multi-component copolymer (II) and a hydride of the multi-component copolymer (II) (III) having a polymerization composition of Contains one or more selected rubbery copolymers (α), vinylidene fluoride resin (β), and other resins (γ) that can be blended with these (α) and (β), and (α ) is 95 to 40% by weight,
A rubber composition characterized in that (β) is 5 to 60% by weight and (γ) is 3 to 55% by weight. (2) The rubber composition according to claim (1), wherein the other resin (γ) is a vinyl chloride resin.