JPH01304134A - Rubber composition - Google Patents

Abstract

PURPOSE:To attempt to improve heat resistance, oil resistance, weatherability and electrical characteristics by compounding a specified chlorinated ethylene- propylene copolymer with a halogen-contg. elastomer. CONSTITUTION:An ethylene-propylene copolymer having a propylene content of 15-40wt.% an MFR of 0.01-5.0g/10min, a Mooney viscosity (ML1+4, 100 deg.C) of 10-180, a melting peak measured by means of a differential scanning calorimeter of 80 deg.C or higher, a crystallinity measured by the X-ray technique of 3% or higher and wt.-average MW/number-average MW, which is an indication of MW distribution, measured by means of gel permeation chromatography of 4 or larger is chlorinated in an aq. medium to obtain a chlorinated ethylene- propylene copolymer (A) having a chlorine content of 20-45wt.%, a Mooney viscosity of 10-150 and an MFR of 1-100g/10min. Then, 10-90wt.% component A is melt-kneaded with 90-10wt.% halogen-contg. elastomer (B) having a halogen content of 1.0-50wt.% and a Mooney viscosity of 5-200 (e.g., crystalline chlorinated PE) at 70 deg.C or lower.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rubber composition with excellent heat resistance, oil resistance and electrical properties. More specifically, it is a rubber composition consisting of (A) a chlorinated ethylene-propylene copolymer and (B) a halogen-containing elastomer, and has not only excellent heat resistance, oil resistance, and electrical properties, but also weather resistance. The present invention also relates to a rubber composition having good properties.

[Conventional technology]

For a long time, halogen-containing elastomers have low density.

Thermoplastic resins such as linear or high-density polyethylene, ethylene-propylene random copolymer, ethylene-propylene block copolymer, acrylonitrile-styrene copolymer resin, and ethylene-propylene copolymer rubber (EP
R), ethylene-propylene-diene ternary copolymer rubber (
EPDM), ethylene-vinyl acetate copolymer rubber, styrene-butadiene copolymer rubber (SBR), acrylonitrile-butadiene copolymer rubber (NBR), isoprene-isobutylene copolymer rubber (butyl rubber).

11R) and other rubbers are widely used. The resulting composition can be used as a coating for electric wires, parts of electrical equipment,
Widely used for automobile parts, industrial parts, etc.

[Problem to be solved by the invention]

Although improvements in mechanical strength, hardness, electrical properties, etc. can be easily achieved in compositions obtained by blending high-density polyethylene (density polyethylene, high-density polyethylene), the rubber properties are significantly reduced. . Also,
EPR, EPDM, SBR for halogen-containing elastomers
Compositions containing copolymer rubbers such as the following have good rubber properties and processability, but oil resistance and weather resistance deteriorate. In addition, halogen-containing elastomers are often used in the field of automobile parts, but in recent years there has been a demand for rubbers that have excellent heat resistance, oil resistance, and cold resistance.

As described above, the composition (mixture) obtained by blending a resinous material or other rubber with a halogen-containing elastomer has excellent mechanical strength, electrical properties, oil resistance, weather resistance, rubber properties, and flame retardancy. Some of these physical properties are excellent, but on the other hand, the performance characteristics are reduced. That is, there is a problem that it is not possible to obtain a composition in which these properties are balanced.

Based on the above, the present invention provides a composition that does not have these drawbacks, that is, has not only good heat resistance, oil resistance, and weather resistance, but also excellent properties such as tensile strength, abrasion resistance, and cold resistance. Moreover, the object is to obtain a composition which improves the drawbacks of the thermoplastic elastomers commonly used as described above.

[Means and effects for solving the problems] According to the present invention, these problems are such that (A) the content of propylene is 15 to 40% by weight, and the melt flow index is (according to JIS K7210). Measured under condition 14, hereinafter referred to as rMFRJ) is 0.01 to 5.0 g/1
0 min, and the melting peak measured by differential scanning calorimeter was 8 min.
0°C or higher, the degree of crystallinity measured by X-rays is 3% or more, and the weight average molecule jl (
The chlorine content obtained by chlorinating an ethylene-propylene copolymer having a number average molecular weight (Mn) of 4 or more (My)/number average molecular weight (Mn) is 20 to 45% by weight, and Mooney viscosity (ML, 100°C) A chlorinated ethylene-propylene copolymer in which 1O to 1+4 150 and (B) a chlorinated ethylene-propylene copolymer having a halogen content of 1.0 to 50% by weight.
The problem can be solved by a rubber composition which is a composition made of a chlorine-containing elastomer and in which the proportion of the chlorinated ethylene-propylene copolymer in the composition is 10 to 90% by weight.

The present invention will be explained in detail below.

(A) Chlorinated ethylene-propylene copolymer In producing the chlorinated ethylene-propylene copolymer used in the present invention, the propylene content of the raw material ethylene-propylene copolymer is 15 to 40%. % by weight, preferably 18 to 40% by weight, particularly 20 to 3% by weight.
8% by weight is preferred. Propylene content is 15:i
% of an ethylene-propylene copolymer, the resulting chlorinated ethylene-propylene copolymer has poor rubber-like elasticity and is rather plastic-like in the product, and the resulting composition Does not exhibit rubber properties. On the other hand, ethylene containing more than 40% by weight
Chlorination using a propylene copolymer is not preferable because the particles of the chlorinated ethylene-propylene copolymer obtained during chlorination become large and form lumps in the reaction system.

Furthermore, the MFR of the ethylene-propylene copolymer is 0.
．． 01-5.0g/10 minutes, 0.02-5.0g
/IO is desirable, especially 0.05 to 5.0 g/1
0 minutes is preferred. If an ethylene-propylene copolymer having an MFR of less than 0.01 g/10 minutes is used for chlorination, the processability of the resulting chlorinated ethylene-propylene copolymer is poor. On the other hand, when chlorinating an ethylene-propylene copolymer with a content exceeding 5.0 g/IO, the reaction efficiency during the production of the chlorinated ethylene-propylene copolymer is poor, and moreover, the chlorinated product is agglomerated. intense.

Mooney viscosity (M
L, 100℃) is usually 10-180, 1+
4 10 to 170 is preferable, and lO to 150 is particularly preferable.

If an ethylene-propylene copolymer having a Mooney viscosity of less than 10 is chlorinated, the chlorinated product will be severely aggregated during chlorination. On the other hand, when an ethylene-propylene copolymer with a molecular weight exceeding 180 is used, the resulting chlorinated product has excellent mechanical properties, but has poor rubber-like elasticity and is rather plastic-like.

Note that the ethylene-propylene copolymer is usually measured using a differential scanning calorimeter (Dlf'f'erential scan calorimeter).
The melting peak measured by CaloriIIter (DSC) is 80°C or higher, and the crystallinity measured by X-ray is 5% or higher, preferably 80 to 125°C, particularly preferably 85 to 125°C. If the melting peak is below 80°C, the chlorinated ethylene-propylene copolymer becomes lumpy during production, making it impossible to obtain a uniform chlorinated product, which is not preferable.

Further, the ethylene-propylene copolymer has a crystallinity of 3% or more as measured by X-rays, preferably 3 to 50%, and particularly preferably 3 to 4596.

When an ethylene-propylene copolymer having a crystallinity of less than 3% is used for chlorination, it becomes lumpy during the chlorination step, and a uniform chlorinated product cannot be obtained.

Furthermore, the ethylene-propylene copolymer has a weight average molecular weight (My)/
The number average molecular weight (Mn) is 4 or more, preferably 4 to 8. If an ethylene-propylene copolymer having My/Mn of less than 4 is used, it is not preferable because the processability of the resulting chlorinated product is poor.

To produce the chlorinated ethylene-propylene copolymer of the present invention, the ethylene-propylene copolymer is suspended in an aqueous medium. In order to maintain this aqueous suspension state, it is preferable to add a small amount of emulsifying agent or suspending agent. At this time, radical generators such as benzoyl peroxide, azobisisobutyronitrile and hydrogen peroxide, antifoaming agents such as light silicone oil, and other additives may be added as necessary.

In producing the chlorinated ethylene-propylene copolymer of the present invention, it is desirable to chlorinate the copolymer in the aqueous suspension using the following three methods.

The first method involves chlorinating 20-60% of the total chlorination amount at a temperature at least 25°C lower than the melting point of the ethylene-propylene copolymer used in the first step, but higher than 50°C; In the second step, the remaining chlorination is carried out at a temperature 10°C or more higher than the chlorination temperature in the first step, but 5 to 15°C lower than the melting point of the ethylene-propylene copolymer. be.

In addition, the second method includes a method in which the melting point of the ethylene-propylene resin copolymer used in the first step is at least 25
℃ lower temperature, but 20 to 60% of the total chlorination amount is chlorinated at a temperature higher than 50℃, and in the second stage, the temperature is 1 to 7℃ lower than the melting point of the ethylene-propylene copolymer.
The temperature is raised to a high temperature and annealed at this temperature for 10 to 60 minutes without introducing chlorine. In the third step, the ethylene-propylene copolymer has a
This is a method in which the remaining chlorination is carried out at a temperature ~25°C lower.

Furthermore, the third method is at least 2 points lower than the melting point of the ethylene-propylene copolymer used in the first step.
Although the temperature is 5°C lower, 20 to 60% of the total chlorination amount is chlorinated at a temperature higher than 50°C, and the chlorination temperature in the second stage is 10°C or more higher than the chlorination temperature in the first stage (
1 temperature, but at a temperature 5 to 15°C lower than the melting point of the ethylene-propylene copolymer, at least 30% of the remaining chlorination amount, and by this stage, 6 of the total chlorination amount
This is a method in which 0 to 90% chlorination is carried out, and then, in the third step, chlorination is carried out at a temperature lower than the melting point of the ethylene-propylene copolymer, but not more than 2°C lower than the melting point.

The chlorine content of the chlorinated ethylene-propylene copolymer used in the present invention obtained in this way is 20
~45% by weight (by weight, from 20 to 42% by weight, preferably from 25 to 42% by weight). If the chlorine content of the chlorinated ethylene-propylene copolymer is less than 20% by weight, there are problems in recovering and purifying the resulting chlorinated ethylene-propylene copolymer. Moreover, it has poor explosion resistance.

On the other hand, a chlorinated ethylene-propylene copolymer produced when the amount exceeds 45% by weight is not preferable because its thermal stability and heat resistance are significantly reduced.

Further, the Mooney viscosity is 10 to 150 points, preferably 10 to 120 points, and particularly preferably 15 to 100 points with a large fist rotor at a temperature of 100°C.

Furthermore, melt flow index (JISK-721
(Measured under conditions 8, hereinafter referred to as rFRJ)
is generally 1 to 100 g/10 minutes, and 3 to 50 g/10 minutes.
g/10 minutes is preferred, particularly 5 to 30 g/10 minutes.

(B) Halogen-containing elastomer The halogen content of the halogen-containing elastomer used in the present invention is 1.0 to 50% by weight, and 5% by weight.
-45% by weight is preferred, especially 10-45% by weight.
Preferably. Halogen-containing elastomers with a halogen content of less than 1.0% by weight have poor explosion resistance. Furthermore, oil resistance etc. are inferior.

On the other hand, a halogen-containing elastomer with a halogen content of more than 50% by weight is undesirable because its thermal stability and heat resistance are significantly reduced.

The halogen-containing elastomer includes chlorine-containing elastomer, fluorine-containing elastomer, and bromine-containing elastomer, and chlorine-containing elastomer and fluorine-containing elastomer are particularly preferred. Representative examples of desirable halogen-containing elastomers include crystalline chlorinated polyethylene, non-grade chlorinated polyethylene, chlorinated products of ethylene-butene-1 copolymer, chlorinated products of ethylene-propylene-diene terpolymer, and Fluorinated ethylene-propylene rubber, chlorinated butyl rubber, chlorosulfonated polyethylene, polychloroprene rubber, epichlorohydrin rubber, chlorinated rubber, fluorinated acrylate polymer rubber, vinylidene fluoride copolymer, silicon fluoride rubber, fluorinated ( (hexafluoride, tetrafluoride) rubber and fluorine diene copolymer rubber. The Mooney viscosity (MLl + 4.100°C) of the halogen-containing elastomer is preferably 5 to 200, particularly preferably 1O to 180, from the viewpoint of crosstalk, moldability, and moldability of the resulting composition. It is. These halogen-containing elastomers are listed in the “Rubber and Elastomer Utilization Notes” (Industrial Research Association,
(published in 1985).

(C) Composition ratio.

The composition ratio of the chlorinated ethylene-propylene copolymer in the composition of the present invention is 10 to 90% by weight, and 15% by weight.
~90% by weight is preferred, especially 15-85% by weight. If the proportion of the chlorinated ethylene-propylene copolymer in the composition is less than 10% by weight, the resulting composition will have poor weather resistance and heat resistance. On the other hand, when it exceeds 90% by weight, it is weather resistant.

It has excellent heat resistance and flame retardancy, and is better than other rubbers (
The disadvantages of halogen-containing elastomers) can be improved. However, the properties of the chlorinated ethylene-propylene copolymer remain unchanged.

(D) Although the composition (mixture) of the present invention can be obtained by uniformly blending the above-mentioned substances such as mixing method, vulcanization method, molding method, etc., dehydrochlorination commonly used in the rubber industry inhibitor, sulfur, sulfur donor, vulcanization accelerator, vulcanization accelerator, organic peroxide,
Crosslinking aid.

Additions such as plasticizers, oxygen, ozone, heat and light (ultraviolet) stabilizers, scotch inhibitors, antiblocking agents, conversion agents, reinforcing agents 1 blowing aids, flame retardants, flame retardant aids, lubricants and colorants. Agents may be added depending on the intended use of the composition.

When producing the composition of the present invention, the blending (mixing) method is to use mixers such as oven rolls, dry blenders, Banbury mixers, and kneaders commonly used in the art. Bye.

Among these mixing methods, two or more of these mixing methods may be applied in order to obtain a layer-uniform composition (for example, after mixing in advance with a dry blender, the mixture may be mixed using an oven roll). method of mixing).

In these mixing methods, if melt mixing is carried out at a relatively high temperature, part or all of the chlorinated ethylene-propylene copolymer used may be vulcanized or crosslinked. For this reason, it is usually necessary to carry out the process at 70°C or lower.

The composition thus obtained is formed into a desired shape using extrusion molding machines, injection molding machines, compression molding machines, transfer molding machines, etc. commonly used in the rubber industry.

Further, when vulcanizing or crosslinking, the vulcanization or crosslinking is usually carried out at a temperature in the range of 100 to 200° C. during molding, or by heating in a steam can, air bath, or the like.

The vulcanization or crosslinking time varies depending on the vulcanization or crosslinking temperature, but is generally 0.5 to 120 minutes.

[Examples and comparative examples]

Hereinafter, the present invention will be explained in more detail with reference to Examples.

In the Examples and Comparative Examples, JJSNα3 dumbbells were manufactured using test pieces according to JIS K2SO3 for tensile tests. Tensile strength (hereinafter referred to as "TB") and elongation (hereinafter referred to as "EB") were measured using a Schopper type testing machine according to JIS K2SO3.

Furthermore, the heat resistance test was performed by leaving the sample at a temperature of 120° C. for 72 hours, and measuring the residual tensile strength and tensile elongation (elongation rate) according to JIS K2SO3. In addition, for the oil resistance test, JIS" 3 oil was placed in a JI8 test tube tester set at a temperature of 120°C, and JIS
Immerse the α3 dumbbell and the sample for volume change rate measurement,
After leaving each sample for 3 days, measurements were performed in the same manner as in the aging test using the same measuring device.

Furthermore, in the compression set test, the sample was compressed to 25%, kept compressed under a constant load, and then left in a heat aging tester at 120° C. for 72 hours. Thereafter, the load was removed, and the sample was allowed to stand in a constant temperature room at a temperature of 23° C. and a humidity of 60% for 30 minutes, and its strain rate was measured. In addition, the weather resistance test was conducted using a Sunshine Weatherometer tester at a temperature of 40°C and an aging time of 2.
After aging for 50 hours, the residual tensile strength and tensile elongation were measured in the same manner. Furthermore, the ozone resistance test was conducted at a temperature of 40°C, an elongation rate of 20%, and an ozone concentration of 50 pph in accordance with JIS K2SO3.
A+, static conditions were left for 200 hours, and the presence or absence of cracks was observed.

In addition, the chlorinated ethylene-propylene copolymer, halogen-containing elastomer, inorganic substance, acid acceptor, crosslinking agent, vulcanizing agent, crosslinking aid, vulcanization accelerator, and plasticizer used in the Examples and Comparative Examples The types and physical properties of each are shown below.

[(A) Chlorinated ethylene-propylene copolymer] As a chlorinated ethylene-propylene copolymer, the propylene content is 22% by weight in the form of an aqueous suspension, and the Mooney viscosity (ML, 100°C) is 1151+4 ethylene-propylene copolymer (MFRl, 0
g/10 minutes, melting point 120°C, hereinafter referred to as rEPR(L)J) 10) Prepare 50 to 90 cg while stirring.
The chlorine content of the copolymer in the temperature range of 18.degree.
It was chlorinated to 2% by weight (first stage chlorination).

Next, the temperature of the reaction system was raised to 121 to 125°C, and in this temperature range, the introduction of chlorine was stopped and annealing was performed for 30 minutes (second stage annealing).

Then, the reaction system was cooled and chlorinated in the temperature range of 95 to 118°C until the chlorine content became 35.4 t% (third stage chlorination), and the resulting Mooney viscosity (ML
, 100°C) is 42.0 chlorinated ethylene-propylene copolymer (MFRIO, Og/lO
(hereinafter referred to as rCI EPR(A)J) and the above EPR
10 kg of PR (1) was charged in the same manner as above, and chlorinated with stirring in a temperature range of 50 to 90°C until the chlorine content of the copolymer became 18.2% by weight (first stage chlorination). ). The reaction system was then heated to 105-115°C, and chlorinated in this temperature range until the chlorine content reached 27.1% by weight (second stage chlorination). Then, the chlorinated ethylene-propylene-based compound having a Mooney viscosity (ML1 + 4.100°C) of 61 was then chlorinated in the temperature range of 118 to 120°C until the chlorine content became 30.2% by weight. A polymer (FR11, Og/10 min, hereinafter referred to as rCI EPR(B) J) was used.

[(B) Halogen-containing elastomer]

Furthermore, as a halogen-containing elastomer, chlorinated polyethylene [Mooney viscosity (ML, +4.100°C)] obtained by chlorinating high-density polyethylene with a molecular weight of about 200,000 and a density of 0.953 g/-
75, chlorine content 35.2% by weight, hereinafter referred to as “CP EJ
], Mooney viscosity (ML, 100℃) is 5
Polychloroprene 1+4 (hereinafter referred to as rCRJ), which is 0, Mooney viscosity (ML,
Ebichlorhito 1+4 Lingom (hereinafter referred to as rcHRJ) whose temperature (at 100°C) is 55 and whose chlorine content is 35.2% by weight and whose sulfur content is 1.0% by weight.
Chlorosulfonated polyethylene (hereinafter r
CSMJ) was used.

[(C) Carbon black]

In addition, as carbon black, carbon black manufactured by the furnace method (manufactured by Showa Cabot Co., Ltd., product name
Show black FEF, average particle size 51na+, specific surface area 4*d/, FEF, hereinafter referred to as rCB-IJ), carbon black manufactured by the same method (manufactured by Asahi Carbon Co., Ltd., trade name Asahi Thermal, average particle size 118nm, specific surface area 19nf/g.

SRF (hereinafter referred to as rCB-2J) and carbon black manufactured by the same method (manufactured by Columbia).

Product name: Statex MT, average particle size: 500 nm.

Specific surface area (fi/g, MT, hereinafter referred to as rCB-3J) was used.

[(D) Acid acceptor]

Furthermore, as acid acceptors, tribasic lead sulfate (manufactured by Koshosha, trade name TS, average particle size 'l, Q grn, density 7.0 g/cal, hereinafter referred to as "tribase"), magnesium oxide ( Manufactured by Kyowa Kagaku Co., Ltd., product name: Kyowa Mug 150.
150 rrr/g, hereinafter referred to as r M g OJ)
and lead oxide (manufactured by Shinyo Kako Co., Ltd., trade name: Resurge, hereinafter referred to as rPbOJ) were used.

[(E) Crosslinking agent, vulcanizing agent]

In addition, n-butyl-bis(tertiary-butylperoxy)valerate (hereinafter referred to as rVJ) was used as a crosslinking agent, and trithiocyanuric acid (hereinafter referred to as ``triazine'') and powdered sulfur (200 mesh pass, (hereinafter referred to as rSJ) was used.

[(F) Crosslinking aid, vulcanization accelerator]

Furthermore, triallylisocyanurate (
rTA I CJ) and 2-mercaptobenzothiazolehexylamine salt (hereinafter referred to as rTA I CJ) as a vulcanization accelerator.
(hereinafter referred to as rMDcAJ), sodium salt of pentamethylene dithiocarbamate (hereinafter referred to as rPMTCJ)
, benzothioyl disulfide (hereinafter referred to as "DM")
, tetramethylthiuram disulfide (hereinafter referred to as "TTj"), dipentamethylenethiuram tetrasulfide (
rTRAJ) and N,N'-diethylthiourea (hereinafter referred to as "EURJ") were used.

[(G) Vulcanization accelerator]

Further, as vulcanization accelerating aids, zinc oxide (hereinafter referred to as rZnOJ) and stearic acid (hereinafter referred to as rstJ) having an average particle size of 0.5- were used.

[(H) Anti-aging agent]

Furthermore, as anti-aging agents, phenyl-1-naphthylamine (hereinafter referred to as rPAJ), nickel dibutyldithiocarbamate (hereinafter referred to as rNBCJ), and a mixture of phenyl-β-naphthylamine and diphenyl-p-phenylenediamine (hereinafter referred to as rHPJ) are used as anti-aging agents. ) was used.

[(j) Plasticizer]

In addition, as a plasticizer, process oil (hereinafter referred to as rLPOJ) having a viscosity (23°C) of 25.5 centipoise is used.
and trioctyl trimellitate (rTOTMJ)
) was used.

[(K) Other additives]

Furthermore, as other additives, low molecular weight polyethylene (hereinafter referred to as rACPEJ) having a molecular weight of about 4000 is used.
, silica with an average particle size of 20℃m (hereinafter referred to as "Hi-Sil")
) and a tackifier, coumaron-indene resin (manufactured by Ohmukai Shinko Kagaku Kogyo Co., Ltd., melting point: 70°C, hereinafter referred to as "Resinex").

Examples 1-21. Comparative Examples 1 to 12 Chlorinated ethylene-propylene copolymers (r(J!-
EPRJ), halogen-containing elastomer, carbon black, acid acceptor, crosslinking agent or vulcanizing agent, crosslinking aid or vulcanization accelerator, and vulcanization accelerating aid whose compounding amounts are shown in Table 2. , anti-aging agents and plasticizers, and other additives: 1 part by weight of ACPE in Example 19, 10 parts by weight of HiSil and 10 parts by weight in Example 20, 10 parts by weight in Comparative Example 9. Hi-Sil and 10 parts by weight of Resinex, and in Comparative Example 10, 1 part by weight of ACPE were kneaded using an oven roll for 20 minutes, and each was molded into a sheet. Each sheet-like material obtained was molded using a compression molding machine at a temperature of 1.
65℃ or 171℃ and pressure 200 kg/c-
A vulcanized product and a crosslinked product were produced while vulcanizing or crosslinking for 30 minutes under these conditions. Tensile strength (TB) for each vulcanizate and crosslinked product obtained.

Tests and measurements were conducted on elongation (EB'), heat resistance, oil resistance, weather resistance, compression set, and ozone resistance. The results are shown in Tables 3 and 4.

(The following are blank spaces) Table 4 (Part 1) Table 4 (Part 2) From the results of the above examples and comparative examples, the rubber composition of the present invention is only excellent in tensile strength (TB) and weather resistance. It is clear that it has excellent heat resistance as well.

〔Effect of the invention〕

The rubber composition of the present invention exhibits the following effects (characteristics).

(1) Mechanical strength (for example, tensile strength) is good.

(2) The dimensional accuracy of the molded product is excellent.

(3) Good weather resistance compared to rubber having double bonds.

(4) Good compression set.

(5) The vulcanizate or crosslinked product has excellent vulcanizability or crosslinkability.

(6) Good oil resistance.

(7) Excellent permanent elongation.

(8) Good heat resistance.

(9) Excellent ozone resistance.

(10) Good blendability.

The rubber composition of the present invention can be used in a wide variety of ways to achieve the above-mentioned effects. Typical uses are shown below.

(1) Various rubber parts for automobiles (e.g. gaskets, hoses) (2) Electric wire coatings (3) Parts for electrical equipment, electronic devices, etc. (4) Various gaskets, sheets (5) Hoses (6) Various building materials Parts (7) Roofing, pond liner

Claims (1)

[Scope of Claims] (A) The content of propylene is 15 to 40% by weight,
and a melt flow index of 0.01 to 5.0 g/
10 minutes, the melting peak measured by differential scanning calorimeter is 80°C or higher, the crystallinity measured by X-ray is 3% or higher, and the molecular weight distribution index measured by gel permeation chromatography. Weight average molecular weight /
The chlorine content obtained by chlorinating an ethylene-propylene copolymer having a number average molecular weight of 4 or more is 20 to 45% by weight, and the Mooney viscosity (ML_
A composition consisting of a chlorinated ethylene-propylene copolymer having a 1_+_4, 100°C) of 10 to 150, and (B) a halogen-containing elastomer having a halogen content of 1.0 to 50% by weight. A rubber composition in which the composition ratio of the chlorinated ethylene-propylene copolymer is 10 to 90% by weight.