JP2003040934A - ETHYLENE-alpha-OLEFIN-NONCONJUGATED POLYENE BASED COPOLYMER RUBBER AND COMPOSITION THEREOF - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ethylene-α-olefin-nonconjugated polyene based copolymer rubber, maintaining properties such as strengths, a compressive residual strain to be a fully satisfiable level, excellent in extrudability and therefore suitably usable in a field such as a sealing material obtained by extrusion-molding, and to provide a rubber composition containing this copolymer rubber. SOLUTION: A specific copolymer is obtained by copolymerizing ethylene, a 3-20C α-olefin and a nonconjugated polyene, as essential components, in the presence of a catalyst A: an average composition formula, VO(OR)m (OR')n X3-m-n (Wherein, R is a 1-8C secondary or above hydrocarbon group, R' is a 1-8C straight chain hydrocarbon group, X is a halogen, and m and n are each a positive number and m+n<=3, m≠0 and n≠0).

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an ethylene-α-olefin-non-conjugated polyene copolymer rubber and a rubber composition containing the copolymer. For more details,
INDUSTRIAL APPLICABILITY The present invention maintains the physical properties such as strength and compression set at a sufficiently satisfactory level, and is excellent in extrudability. Therefore, ethylene-α-, which is suitably used in the field of sealing materials and the like obtained by extrusion molding The present invention relates to an olefin-non-conjugated polyene copolymer rubber and a rubber composition containing the copolymer rubber.

[0002]

2. Description of the Related Art Ethylene-α-olefin-non-conjugated polyene copolymer rubber has no unsaturated group in its main chain and is more heat resistant than general-purpose diene rubbers such as natural rubber and butadiene rubber. Because of its superiority, it is widely used in automotive parts, automotive water hoses, weather strips, electric wires and other products. Among such products, for example, sealing materials such as window frames of automobiles or building materials, water-based hoses, electric wires, etc. are molded and processed using an extruder and then U
Products are vulcanized with HF and hot air. Therefore, in order to reduce the cost of the molding process, a polymer having a large extrusion amount per unit time is desired. That is, an ethylene- [alpha] -olefin-non-conjugated polyene copolymer rubber that maintains physical properties and has improved extrudability is desired.

Regarding the ethylene-α-olefin-non-conjugated polyene-based copolymer rubber which is excellent in extrusion processability, it has hitherto been disclosed in Japanese Patent Application Laid-Open No. 61-4708, that is, V.
A production method is known in which vanadate ester obtained by modifying OCl ₃ with a secondary alcohol is used as a catalyst. However, the copolymer obtained by such a method has improved extrudability, but has poor cold resistance typified by compression set at low temperature, and has recently required high performance (processability and physical properties).
In light of this, it was by no means satisfactory.

[0004]

Under such circumstances, the problem to be solved by the present invention is to maintain the physical properties such as strength and compression set at a level that can be sufficiently satisfied, and to have excellent extrudability, and therefore to extrude. An object of the present invention is to provide an ethylene-α-olefin-non-conjugated polyene copolymer rubber and a rubber composition containing the copolymer rubber, which are preferably used in the field of sealing materials obtained by molding.

[0005]

That is, one invention of the present invention is a copolymer obtained by polymerizing the following essential components (a) to (c) in the presence of the following catalyst A: And an ethylene-α-olefin-non-conjugated polyene copolymer satisfying the following conditions (1) to (3). Catalyst A: average composition formula, VO (OR) _m (OR ') _n X
_3-mn (wherein R represents a secondary or higher hydrocarbon group having 1 to 8 carbon atoms, R'represents a linear hydrocarbon group having 1 to 8 carbon atoms, X represents halogen, m and m n represents a positive number,
In addition, m + n ≦ 3, m ≠ 0, and n ≠ 0. ) (A): Ethylene (b): C3-C20 α-olefin (c): Non-conjugated polyene (1) The ethylene-derived unit / α-olefin-derived unit molar ratio in the copolymer is 0.90. /0.10-0.50/
It is 0.50 (2) The iodine value is 1 to 50 (g / 100 g polymer) (3) The intrinsic viscosity [η] measured at 135 ° C. in tetralin is 0.5 to 10 dl / g Another aspect of the present invention relates to a rubber composition containing at least one of the above-mentioned copolymer rubber, a softening agent, a reinforcing agent, and a vulcanizing agent.

[0006]

DETAILED DESCRIPTION OF THE INVENTION The copolymer rubber of the present invention comprises a catalyst A
Is an ethylene-α-olefin-non-conjugated polyene copolymer rubber which is polymerized in the presence of

The catalyst A has an average composition formula, VO (OR)
_m (OR ') _n X _3-mn (wherein R represents a secondary or higher hydrocarbon group having 1 to 8 carbon atoms, R'represents a linear hydrocarbon group having 1 to 8 carbon atoms, X Represents halogen, m and n represent positive numbers, and m + n ≦ 3, m ≠ 0, n ≠ 0.), For example, the general formula VO (OR) _n X
_3-n (provided that R represents a secondary or higher hydrocarbon group, X represents halogen, n represents an integer, and 0 ≦ n ≦ 3) and the number of carbon atoms is 1 to 1 1 of 8
It can be obtained by mixing and reacting with a primary alcohol. Here, m is preferably 0.5 to 2. When the value of m is less than 0.5, the workability improving effect is poor, and when it exceeds 2, the compression set tends to be inferior. Further, n is preferably 1 to 2. If n is less than 1, the compression set tends to be inferior,
When it exceeds 2, the effect of improving the workability becomes small. _{Specifically, VO (Oiso-C 3 H} 7) (OEt) Cl,
_{VO (Oiso-C 3 H 7} ) (OEt) 2, VO (Ois
_{o-C 3 H 7) 0.5} (OEt) 1.5 Cl, VO (Oiso-
_{C 3 H 7) 1.5 (OEt} ) 0.5 Cl, VO (Oiso-C 3
An example is a catalyst component having an average composition such as H ₇ ) _0.8 (OEt) _1.1 Cl _1.1 . Also, of these,
VO (Oiso-C) is a particularly preferred example because it is easy to synthesize.
₃ H ₇₎ can be mentioned _{0.8 (OEt) 1.1 Cl 1. 1} . These are mixed VOCl ₃ and the corresponding alcohol.
It can be easily obtained by reacting or by mixing and reacting VOCl ₃ with VO (OR) ₃ and VO (OR ′) ₃ and R′OH.

A co-catalyst is also necessary when carrying out the polymerization.
Required As the co-catalyst, the general formula R '_mAlX
_3-m(However, R'represents a hydrocarbon group and X is a halogen.
, M is an integer, and 0 ≦ m ≦ 3. )so
It is possible to use the indicated organoaluminum compounds
, (C₂H_Five)₂AlCl, (C_FourH₉)₂AlCl, (C
₆H₁₃)₂AlCl, (C₂H_Five)_1.5AlCl_1.5, (C_Four
H₉)_1.5AlCl_1.5, (C₆H ₁₃)_1.5AlCl_1.5, C
₂H_FiveAlCl₂, C_FourH₉AlCl₂, C₆H₁₃AlCl₂etc
Can be illustrated.

The ratio of the organoaluminum compound to the vanadium compound (catalyst A) in the polymerization reaction is preferably 2.5 or more in terms of molar ratio from the viewpoint of activity stability of the polymerization.

The α-olefin of the comonomer is preferably an α-olefin having 3 to 20 carbon atoms, and specific examples thereof include propylene, 1-butene, 1-pentene,
Linear olefins such as 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 3-methyl-
1-butene, 3-methyl-1-pentene, 4-methyl-
Examples include branched olefins such as 1-pentene and vinylcyclohexane. Above all, from the viewpoint of easy availability
Propylene and 1-butene are preferable, and propylene is particularly preferable. As the α-olefin, two or more kinds can be used at the same time.

Examples of the non-conjugated polyene include 1,4
-Hexadiene, 1,6-octadiene, 2-methyl-
Chain non-conjugated dienes such as 1,5-hexadiene, 6-methyl-1,5-heptadiene, 7-methyl-1,6-octadiene; cyclohexadiene, dicyclopentadiene, methyltetraindene, 5-vinylnorbornene Cyclic non-conjugated dienes such as 5-ethylidene-2-norbornene, 6-chloromethyl-5-isopropenyl-2-norbornene; 2,3-diisopropylidene-5
-Norbornene, 2-ethylidene-3-isopropylidene-5-norbornene, 2-propenyl-2,2-norbornadiene, 1,3,7-octatriene, 1,4.
Examples thereof include trienes such as 9-decatriene, and one kind thereof may be used alone, or two or more kinds may be used in combination. From the viewpoint of copolymerization reactivity and crosslinking reaction rate,
Preference is given to 5-ethylidene-2-norbornene and / or 5-ethylidene-2-norbornene and dicyclopentadiene.

Ethylene-derived units in the copolymer of the present invention /
The molar ratio of units derived from α-olefin is 0.90 / 0.10.
~ 0.50 / 0.50, preferably 0.85 /
It is 0.15-0.55 / 0.45. If the molar ratio is too high, the cold resistance deteriorates, and if it is too low, the strength becomes insufficient.

The iodine value in the copolymer of the present invention is 1 to 50.
(G / 100g polymer), preferably 1-40
And more preferably 3 to 35. If the iodine value is too low, vulcanization will be difficult, and if it is too high, the weather resistance will be poor.

The copolymer of the present invention is 13 in tetralin.
Intrinsic viscosity [η] measured at 5 ° C is 0.5 to 10 dl / g
And preferably 0.8 to 8 dl / g, and more preferably 1.0 to 5 dl / g. If the intrinsic viscosity is too low, the strength will be insufficient, and if it is too high, the workability will decrease.

The rubber composition of the present invention is a rubber composition containing the copolymer rubber of the present invention and at least one of a softening agent, a reinforcing agent and a vulcanizing agent.

The softening agent may be mixed with the copolymer in the production process, or may be mechanically mixed with a Banbury mixer or a roll. Specific examples of such a softening agent include process oil, lubricating oil, paraffin, liquid paraffin,
Petroleum softeners such as petroleum asphalt and vaseline, coal tar softeners such as coal tar and coal tar pitch, fatty oil softeners such as castor oil, linseed oil, rapeseed oil and coconut oil, tall oil, sub, honey Wax, carnauba wax, lanolin and other waxes, ricinoleic acid, palmitic acid, barium stearate, calcium stearate,
Fatty acids and fatty acid salts such as zinc laurate, petroleum resin,
Examples include synthetic polymer substances such as atactic polypropylene and coumarone indene resin.

Specific examples of the reinforcing agent include SRF and GP.
F, FEF, MAF, HAF, ISAF, SAF, F
Carbon black such as T and MT, those obtained by surface-treating these carbon blacks with a silane coupling agent,
Examples thereof include silica, activated calcium carbonate, fine talc, and fine silicic acid.

As the vulcanizing agent, sulfur, sulfur compounds and organic peroxides can be used. The form of sulfur is not particularly limited, and for example, powdered sulfur, precipitated sulfur, colloidal sulfur, surface-treated sulfur, insoluble sulfur and the like can be used.

In the composition of the present invention, other components than the above, for example, inorganic fillers, stabilizers, processing aids, foaming agents, foaming aids, plasticizers, colorants, flame retardants, and other additives are added. May be included.

The composition of the present invention may further contain other rubber or resin, if necessary. Such other rubbers include natural rubber (NR) and isoprene rubber (IR)
Such as isoprene rubber, butadiene rubber (BR), styrene-butadiene rubber (SBR), acrylonitrile-butadiene rubber (NBR), chloroprene rubber (C
Examples thereof include conjugated diene rubbers such as R).

The composition of the present invention may further contain a conventionally known ethylene-α-olefin copolymer rubber,
For example, ethylene / propylene random copolymer (EP
R), ethylene-based copolymers other than the above-mentioned ethylene-based copolymer rubbers such as EPDM can be used.

Examples of other resins include high density polyethylene, medium density polyethylene, low density polyethylene and LLD.
Polyethylene resin such as PE (linear low-density polyethylene), polypropylene resin, poly-4-methyl-pentene-1, polystyrene, polyester, polyamide,
Examples thereof include polyphenylene ether.

The composition of the present invention can be prepared from an ethylene-α-olefin-non-conjugated polyene copolymer and other components as described above by a general method for preparing a rubber compound. For example, an internal mixer such as a Banbury mixer, a kneader or an intermix is used to knead the copolymer and other components at a temperature of 80 to 170 ° C. for 3 to 10 minutes, and then roll such as an open roll. Using a kind or kneader, temperature 40 ~ 80 ℃
Then, a vulcanizing agent, a vulcanization accelerator, a vulcanization aid, or the like may be added, if necessary, and the mixture may be kneaded for 5 to 30 minutes and then dispensed. In this way, a ribbon-shaped or sheet-shaped composition (blended rubber) is usually obtained. When the kneading temperature in the above internal mixers is low,
A vulcanizing agent, a vulcanization accelerator, a foaming agent and the like can be kneaded at the same time.

The unvulcanized composition of the present invention can be vulcanized into a vulcanized copolymer composition. To obtain a vulcanized copolymer composition, the unvulcanized composition is usually
Whether to preform into a desired shape by various molding methods such as extrusion molding machine, calender roll, press, injection molding machine, transfer molding machine, and to introduce the molded product into the vulcanization tank and heat at the same time as molding or after molding Alternatively, it may be vulcanized by irradiating with an electron beam.

In the case of vulcanization by heating, a heating tank such as hot air, a fluidized bed of glass beads, UHF (ultra high frequency electromagnetic wave), steam, LCM (hot molten salt tank) is used and the temperature is 150 to 270. It is preferable to heat at a temperature of ° C for 1 to 30 minutes.

When vulcanizing by electron beam irradiation without using a vulcanizing agent, the preformed composition has
An electron beam having an energy of 10 MeV, preferably 0.3 to 2 MeV, and an absorbed dose of 0.5 to 35 Mrad,
Irradiation may preferably be performed at 0.5 to 10 Mrad.

When molding and vulcanizing an unvulcanized composition,
Usually molded and vulcanized continuously. Moreover, you may vulcanize using a metal mold | die. The vulcanized rubber molded and vulcanized as described above includes, for example, weather strips, door glass run channels, window frames, radiator hoses, brake parts, automobile industrial parts such as wiper blades, rubber rolls, belts, packings, hoses, etc. It can be used for industrial rubber products, electric insulation materials such as anode caps and grommets, construction gaskets, civil engineering materials such as civil engineering sheets, and rubberized cloth.

A vulcanized foam obtained by heat-foaming a composition containing a foaming agent is a heat insulating material, a cushion material,
It can be used for applications such as sealing materials.

[0029]

The present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to these. [1] Measuring method <GPC measuring method> The GPC device is manufactured by Waters 15
0 C, elution temperature is 140 ° C., and the column used is Shodex Packed Column A-80 manufactured by Showa Denko KK
M, polystyrene (Tosoh Corporation, molecular weight 68-8,400,000) was used as the molecular weight standard substance. The obtained polystyrene-converted weight average molecular weight (Mw), number average molecular weight (Mn), and this ratio (Q value = Mw / Mn) were taken as the molecular weight distribution. As a measurement sample, about 5 mg of a polymer is dissolved in 5 ml of o-dichlorobenzene to give a concentration of about 1 mg / ml. 400 μl of the obtained sample solution was injected, the elution solvent flow rate was 1.0 ml / min,
It was detected by a refractive index detector.

<Measurement of propylene content and ethylene /
Calculation of Molar Ratio of Propylene> Infrared absorption spectrum (IR spectrum) using an infrared spectrophotometer (IR-810 manufactured by JASCO Corporation), polypropylene, polyethylene, ethylene / propylene copolymer (50:50) Was measured as a standard product. The measurement sample was measured as a film of about 0.1 mm using a hot press machine. Measured values are literature values (characterization of polyethylene by infrared absorption spectrum) Takayama, Usami et al.
Or Die Makromolekulare Che
mie, 177, 461 (1976) Mc Rae,
M. A. , Madam S, W.M. F. 115)
The absorption peak (methyl branching) at 5 cm ^-1 was used as a marker to obtain the average value of three measurements, which was then converted to a molar ratio.

<Iodine Value> The copolymer was hot-pressed to form a film having a thickness of 0.5 mm, and a peak derived from 5-ethylidene-2-norbornene (wave number 1688 cm ^{− 1} ) Permeability was calculated, the molar content of double bonds in the copolymer was calculated, and converted to iodine value.

[2] Preparation of Copolymer Example 1 Hexane was used as a polymerization solvent from a lower portion of a 100 L stainless steel polymerization tank equipped with a stirrer, and hexane was 106.7 per hour.
Kg, ethylene, propylene each 3.65 Kg per hour,
Feed continuously at a rate of 14.23 Kg. The average compositional formula as _{catalyst, VO (Oiso-C 3 H} 7) 0.8 Cl 2.2, ethanol each hour 4.60 g, using a line mixer 1.23 g, catalyst A mixed and stirred to: average composition formula,
_{VO (Oiso-C 3 H 7} ) 0.8 (OEt) 1.1 to Cl _1.1 was fed to the polymerization vessel after adjusting and hourly separately ethylaluminum sesquichloride (EASC) 18.40 g
It is continuously fed to the polymerization tank at the speed of
It was kept at ℃. A part of the polymerization liquid was extracted, and the polymer was precipitated by steam stripping and dried. Thus, 4.5 Kg / h of copolymer was obtained. The molecular weight was adjusted with hydrogen. The results are shown in Table 1. In addition, VO (O
catalyst having an average composition of _{iso-C 3 H 7) 0.8} Cl 2.2 was adjusted by mixing in a molar ratio of VOCl3 and _{VO (Oiso-C 3 H 7} ) 3 in advance 2.2 / 0.8.

Example 2 From the bottom of a 100 L stainless steel polymerization tank equipped with a stirrer, hexane was used as a polymerization solvent at 106.7 per hour.
Kg, ethylene, propylene each 3.65 Kg per hour,
Feed continuously at a rate of 14.23 Kg. The average compositional formula as _{catalyst, VO (Oiso-C 3 H} 7) 0.8 Cl 2.2, ethanol each hour 4.60 g, using a line mixer 0.62 g, catalyst A mixed and stirred to: average composition formula,
_{VO (Oiso-C 3 H 7} ) 0.8 (OEt) 1.1 to Cl _1.1 was fed to the polymerization vessel after adjusting and hourly separately ethylaluminum sesquichloride (EASC) 18.40 g
It is continuously fed to the polymerization tank at the speed of
It was kept at ℃. A part of the polymerization liquid was extracted, and the polymer was precipitated by steam stripping and dried. Thus, 4.6 kg of a copolymer was obtained every hour. Others were basically the same as in Example 1. The polymerization results are shown in Table 1.

Comparative Example 1 Hexane was used as a polymerization solvent from the bottom of a 100 L stainless steel polymerization tank equipped with a stirrer, and hexane was used at a rate of 106.7 per hour.
Kg, ethylene, propylene each 3.65 Kg per hour,
Feed continuously at a rate of 14.23 Kg. As catalyst B, VOCl ₃ and ethanol were 4.30 g / hr and 2.
Using a line mixer, 07 g was mixed and stirred and then fed to the polymerization tank. Separately, ethylaluminum sesquichloride (EASC) was continuously fed to the polymerization tank at a rate of 24.54 g / hour to control the temperature of the polymerization tank. It was kept at 44 ° C.
A part of the polymerization liquid was extracted, and the polymer was precipitated by steam stripping and dried. Thus 4.5 kg per hour
A copolymer of Others are basically Embodiment 1
I went the same way. The polymerization results are shown in Table 1.

Comparative Example 2 Hexane was used as a polymerization solvent from the bottom of a 100-liter stainless steel polymerization tank equipped with a stirrer, and hexane was used at a rate of 106.7 per hour.
Kg, ethylene, propylene each 3.65 Kg per hour,
Feed continuously at a rate of 14.23 Kg. As catalyst C, VOCl ₃ and ethylaluminum sesquichloride (EASC) were supplied to the polymerization tank at 5.41 g and 27.06 g per hour, respectively, and the temperature of the polymerization tank was kept at 44 ° C. A part of the polymerization liquid was extracted, and the polymer was precipitated by steam stripping and dried. In this way, 4.3 kg of a copolymer was obtained every hour. Others were basically the same as in Example 1. The polymerization results are shown in Table 1.

Comparative Example 3 From the bottom of a 100 L stainless steel polymerization tank equipped with a stirrer, hexane was used as a polymerization solvent at 106.7 per hour.
Kg, ethylene, propylene each 3.65 Kg per hour,
Feed continuously at a rate of 14.23 Kg. VO (Oiso-C ₃ H ₇ ) Cl ₂ as catalyst D 4.65 g / h
, And ethyl ethyl sesquichloride (E
ASC) was continuously fed to the polymerization tank at a rate of 16.28 g / hour, and the temperature of the polymerization tank was kept at 44 ° C. A part of the polymerization liquid was extracted, and the polymer was precipitated by steam stripping and dried. Thus, 4.7 kg of a copolymer was obtained every hour. Others were basically the same as in Example 1. The polymerization results are shown in Table 1.

[3] Preparation of composition 100 parts by weight of the above copolymer, 100 parts by weight of carbon black ("Asahi 60G" manufactured by Asahi Carbon Co., Ltd.), 60 parts by weight of process oil ("PS-430" manufactured by Idemitsu Co., Ltd.) Then, 1 part by weight of stearic acid and 5 parts by weight of zinc oxide were kneaded with a BB-2 kneader. Next, 2 parts by weight of Accel BZ (manufactured by Kawaguchi Chemical Industry), 0.5 part by weight of Accel TMT (manufactured by Kawaguchi Chemical Industry),
0.5 parts by weight of Accel TRA (manufactured by Kawaguchi Chemical Industry), 1 part by weight of Accel M (manufactured by Kawaguchi Chemical Industry), and 1.5 parts by weight of sulfur were added by an 8-inch roll. Extrusion evaluation is ASTMD
2230. A 45 mmφ extruder manufactured by Nakata Zoki Co., Ltd. was used.
Screw is 40 ℃, head is 80 ℃, and rotation speed is 3
There were two levels of 0 rpm and 60 rpm. The press vulcanization condition of the physical property measurement sample was 160 ° C. × 20 to 30 minutes. The composition is shown in Table 2 and the evaluation results are shown in Tables 3-4.

The results show the following. Examples 1 to 2 using EPDM polymerized in the presence of catalyst A were Comparative Example 1 using EPDM polymerized in the presence of catalyst B instead of catalyst A, and were polymerized in the presence of catalyst C instead of catalyst A. EPD
As compared with Comparative Example 2 in which M was used, it can be seen that the extrusion properties were improved while maintaining the normal physical properties at a usable level. In addition, E polymerized in the presence of catalyst D instead of catalyst A
Compared with Comparative Example 3 using PDM, the extrusion characteristics are almost the same, but the cold resistance is excellent.

[0039]

[Table 1]

[0040]

[Table 2]

[0041]

[Table 3]

[0042]

[Table 4]

[0043]

Industrial Applicability As described above, according to the present invention, the physical properties such as strength and compression set can be maintained at a sufficiently satisfactory level, and the extrudability is excellent. It was possible to provide an ethylene-α-olefin-non-conjugated polyene copolymer rubber which is preferably used in the above and a rubber composition containing the copolymer rubber.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C08L 101/00 C08L 101/00 (72) Inventor Ryusei Sasa 1-5, Anesaki Kaigan, Ichihara, Chiba Sumitomo Chemical Co., Ltd. work Co., Ltd. in the F-term (reference) 4J002 AE05X AG00X BA01X BB04W BB05W BB13X BB15W BK00X DA037 DE237 DG018 DJ017 DJ047 EF056 EG036 EG046 EK008 FD017 FD02X FD026 FD148 4J028 AA01A AB00A AC36A BA00A BA01B BB00A BB01B BC18B EB02 EB04 EB05 EB07 EB08 EB09 EB10 EB17 EB18 EC05 GA04 GA23 4J100 AA02P AA03Q AA04Q AA07Q AA09Q AA15Q AA16Q AA17Q AA18Q AA19Q AA20Q AA21Q AR10R AR11R AR18R AR22R AS11R AS15R AS21R AS25R AU21R BB01R CA05 DA09 DA31

Claims (4)

[Claims] 1. A copolymer obtained by polymerizing the following essential components (a) to (c) in the presence of the following catalyst A, and the conditions (1) to (3) below: A satisfactory ethylene-α-olefin-non-conjugated polyene-based copolymer. Catalyst A: average composition formula, VO (OR) _m (OR ') _n X
_3-mn (wherein R represents a secondary or higher hydrocarbon group having 1 to 8 carbon atoms, R'represents a linear hydrocarbon group having 1 to 8 carbon atoms, X represents halogen, m and m n represents a positive number,
In addition, m + n ≦ 3, m ≠ 0, and n ≠ 0. ) (A): Ethylene (b): C3-C20 α-olefin (c): Non-conjugated polyene (1) The ethylene-derived unit / α-olefin-derived unit molar ratio in the copolymer is 0.90. /0.10-0.50/
0.50 (2) an iodine value of 1 to 50 (g / 100 g polymer) (3) an intrinsic viscosity [η] measured at 135 ° C. in tetralin of 0.5 to 10 dl / g To be 2. The copolymer rubber according to claim 1, wherein the α-olefin of (b) is propylene. 3. The copolymer rubber according to claim 1, wherein the non-conjugated polyene (c) is 5-ethylidene-2-norbornene and / or dicyclopentadiene. 4. A rubber composition containing at least one of the copolymer rubber according to claim 1 and a softening agent, a reinforcing agent and a vulcanizing agent.