JPS6072948A - Olefin copolymer composition - Google Patents

Abstract

PURPOSE:The titled composition in pellet form, for use to be incorporated into a polypropylene resin so as to improve the mechanical strength, impact resistance, and processability in injection molding, obtained by mixing a high-ethylene copolymer with an ethylene-propylene copolymer having a high propylene content. CONSTITUTION:An ethylene-propylene copolymer (A), having a ratio of ethylene: propylene:non-conjugated diene of 5-45:55-90:0-10(wt%), a Mooney viscosity of ML1+4(100 deg.C) of 15-70, and Mw/Mn of 1.5-6 (where Mw is weight-average molecular weight and Mn is number-average molecular weight), and a copolymer (B), having a ratio of ethylene to alpha-olefin of 65-90:10-35(wt%), ML1+4(100 deg.C) of 10-70, and Mw/Mn of 1.5-4, are mixed in a ratio of A to B of 40-90:10-60 (wt%) to form the titled composition, having a ratio of ethylene:(propylene + alpha-olefin):non-conjugated diene of 30-60:40-70:0-9(wt%).

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high propylene content olefin copolymer composition that can be formed into crumb or pellet form.

More specifically, it relates to olefin copolymer compositions used in polypropylene resin blends.

Crystalline polypropylene has high stiffness, high heat distortion temperature,
It has many excellent properties such as good surface hardness, and today it is widely used as a general-purpose resin for a variety of applications.
It has the disadvantages of low impact resistance and brittleness. A common method for overcoming these drawbacks is to mechanically mix synthetic rubbers such as ethylene-propylene copolymer rubber and polyisobutylene rubber.

As the above-mentioned ethylene-propylene copolymer rubber, a high ethylene content, pellet-shaped ° copolymer using a vanadium catalyst is used.

The present inventors have been conducting research on olefin copolymers to be added to polypropylene resins. As a result, it has been found that physical properties such as impact strength can be greatly improved by adding an ethylene-propylene copolymer with a high propylene content. However, when trying to copolymerize ethylene and propylene using a vanadium-based catalyst, if a copolymer with a high propylene content is produced by a conventionally known method,
The polymerization activity of the catalyst was low, and when a large amount of catalyst was used, the molecular weight of the copolymer could not be increased, and the desired copolymer could not be obtained.

Also, Special Publication No. 43-28834, Special Publication No. 44-9390
1 Special Publication Showa 45-3360. It is known that ethylene-propylene copolymers can be obtained in high yields by using special activity enhancers known in JP-A-51-6291, JP-A-56-30415, etc. .

However, it is also known that when an activity improver is used in combination, the molecular weight distribution of the copolymer becomes extremely broad.

The present inventors used a titanium-based catalyst, had few reverse bonds of propylene, and the propylene content in the copolymer was very high for low molecules and very low for high molecules (Mw/Mn of the copolymer =
The composition obtained by mixing a copolymer with a broad molecular weight distribution of = 4 to 18 with polypropylene has good mechanical performance and impact resistance, and has improved extrudability (flowability). He discovered that it was a composition and filed a patent application (Japanese Patent Application No. 58-80563). However, such compositions have the disadvantage that when the molecular weight distribution is broad, the extremely low molecular weight copolymer bleeds onto the surface of the polypropylene composition.

It is known that when a vanadium-based catalyst is compared with a titanium-based catalyst, the molecular weight distribution of the obtained copolymer is narrower and the Mw/Mn value is smaller when a vanadium-based catalyst is used.

When producing ethylene-propylene copolymer using a vanadium-based catalyst, he discovered that the molecular weight distribution of the copolymer becomes extremely narrow when the vanadium compound and organoaluminum compound are brought into contact at low temperatures.
The application was filed as

Subsequent research revealed that by bringing the vanadium compound and organoaluminum compound into contact at low temperatures, an ethylene-propylene copolymer with a high propylene content was produced as a copolymer with high activity, high yield, and a narrow molecular weight distribution. A method was found and Copolymer A was produced using this method.

In general, polypropylene resins often have a pellet-like or powder-like shape, and are powdery.

Mix the ethylene-propylene valve-shaped body with propylene resin and bind the resin composition [if used, the ethylene-propylene valve body]
It is preferred for handling that the propylene copolymer has a pellet or crumb shape. However, the copolymer A used in the present invention is rubber-like, and when used alone in the form of pellets or crumbs, the pellets or crumbs adhere to each other, resulting in a so-called blocking phenomenon, which is inappropriate for practical use. Therefore, it was discovered that the pellet or crumb-like shape could be maintained by blending 10 to 60 weight percent of high ethylene copolymer B with an ethylene content of 65 to 90 weight percent to copolymer A, and the present invention was achieved. did.

That is, the present invention provides (1) an ethylene-propylene copolymer, the composition of which is ethylene:propylene:non-conjugated diene=5-45:55-90:0-10 (wt%
), Mooney viscosity ML100C is 15-70 and M
copolymer A with w/Mn = 1.5 to 6 and 1+4, and ■ the composition of ethylene and α-olefin is ethylene: α-olefin = 65 to 90: 10 to 3
5 (wt%) and a copolymer B having a Mooney viscosity of 10 to 70, and Mw, 4n = 1.5 to 4, and the A and B components have a composition ratio of A:B = 40. ~90:1
Mix at a ratio of 0 to 60 (wt%), and confirm that the composition of the copolymer mixture is ethylene: propylene + α-olefin: non-conjugated diene = 30 to 60: 40 to 70: O to 9 (wt%). The present invention provides a characteristic olefin copolymer composition.

In the present invention, copolymer A is preferably produced by adding an activity enhancer to a catalyst obtained by contacting a hydrocarbon solvent-soluble vanadium compound and an organoaluminum compound at low temperature, and then copolymerizing ethylene and propylene. can get.

As hydrocarbon solvent soluble vanadium compounds, VOC
Qs, VCl4 or VOCQs and/or VCl4
A reaction product of alcohol and alcohol is preferably used. Examples of alcohols include methanol, ethanol, n-propanol, isopropanol, n-butanol, etc.
butanol, n-butanol, n-hexanol, n-
Although octatool, 2-ethylhexal s''7canol, and n-dodecanol are used, alcohols having 3 to 8 carbon atoms are preferably used.

Examples of organoaluminum compounds include triethylaluminum, triinobutylaluminum, tri-n-hexylaluminum, diethylaluminum monochloride,
These include diisobutylaluminum monochloride, ethylaluminum sesquichloride, butylaluminum sesquichloride, ethylaluminum dichloride, butylaluminum dichloride, and the like. A mixture of these organoaluminum compounds can be used. Particularly preferred compounds are ethylaluminum sesquichloride, butylaluminum sesquichloride and mixtures of triisobutylaluminum and ethylaluminum sesquichloride, butylaluminum sesquichloride, ethylaluminum dichloride.

The contact temperature between the vanadium compound and the organoaluminum compound is preferably OC to -50C1, preferably OC to -30C. The time from bringing both components into contact at the above temperature until entering the polymerization reactor is 5 seconds to 1 hour, preferably 10 seconds to 40 minutes. The ratio of aluminum compound and vanadium compound used is Ag/V = 2 to 50 (mole ratio)
, preferably 3-20. At this time, a hydrocarbon compound is used as a solvent. For example, n-pentane,
N-hexane, n-hebutane, n-octane, isooctane, cyclohexane, etc. are preferably used.

I can stay. For example, trichloroacetic acid, 2,3°4.4
．． 4-tetrachlorobutenoic acid (perchlorobutene), 2.3.4.4-tetrachlorobutenoic acid and carbon number 1-
8 alcohol ester (here as alcohol,
Methanol, ethanol, n-7' lovanol, impropatol, n-butanol, tri-butanol, t-butanol, i-hexyl alcohol, n-octyl alcohol, 2-ethyl-hexyl alcohol, etc. are used). Hexachloroacetone, hexachloro-butadiene, hexachlorocyclopentadiene, α, α, α-
Trichlorotoluene, etc. Among these, preferred compounds include n-butyl trichloroacetate, n-butyl perchlorocrotonate, and loptyl 2,3,4.4-tetrachlorobutenoate.

These activity improvers are 0.2 to 0.2 to vanadium compounds.
It is added in an amount of 10 times, preferably 0.5 to 5 times.

H-butylene polymerization of two-handed dipropylene is not limited to normal polymerization methods (for example, solution polymerization in the above-mentioned hydrocarbon solvent, solution polymerization in halogenated hydrocarbon solvent). , halogenated hydrocarbon solvents (e.g.
1,2-dichloroethane, 1,2-dichloropropane,
suspension polymerization in monochlorotoluene, etc.), suspension polymerization in propylene solvent, etc.

Solution polymerization in a hydrocarbon solvent is preferred.

In the present invention, the conditions for narrowing the molecular weight distribution of copolymer A and increasing its activity are to copolymerize ethylene and propylene using a catalyst obtained by contacting a vanadium compound and an organoaluminium compound at a temperature of OC to -50C. At this time, the activity enhancer compound is added to the copolymerization reactor all at once at the initial stage of polymerization or continuously during the polymerization reaction. At this time, the ratio of ethylene, propylene and non-conjugated diene in the copolymer is 5 to 4.
5155-9010-io. Moreover, the temperature of the copolymerization reaction is 0 to 120 tl:', preferably 20 to 60C.

The Mooney viscosity of the copolymer A of the present invention is preferably 15 to 70, and if it is lower than this, mechanical properties and impact resistance will decrease. Moreover, when it is higher than this, extrusion processability (flow characteristics) deteriorates.

Furthermore, the molecular weight distribution of copolymer A of the present invention is MW/M
n = range from 1.5 to 6, preferably from 1.7 to
4 is good. An ethylene-propylene copolymer with a molecular weight distribution narrower than this range is a typical Ziegler-N
When an atta-based catalyst is used, it is difficult to obtain P-. Moreover, if it is wider than this range, there will be disadvantages such as poor flowability and bleeding of low molecular weight substances.

When producing a copolymer, if the vanadium compound and the organoaluminum compound are not brought into contact with each other at a low temperature using a conventionally known activity enhancer, the molecular weight distribution will become broader.
When copolymer A with the same Mooney viscosity is produced, the production of low molecular weight copolymers increases, and after being made into crumbs or pellets, the low molecular weight copolymers bleed, resulting in adhesion of crumbs or pellets, which is undesirable in handling. Indicate a phenomenon.

Copolymer A can also be used as a three-component copolymer by copolymerizing a small amount of non-conjugated diene monomer. The non-conjugated dienes used at this time include ethylidenenorbornene, propylidenenorbornene, propenylnorbornene, dicyclopentadiene, 1,4-hexadiene,
Examples include 5-methyl-1,4-hexadiene, 1,7-octadiene, and 1,9-decadiene.

The proportion of ethylene, propylene and non-conjugated diene in the terpolymer is 5-4s/55-9010-10 (wt%), preferably 10-45/55-8510"-
8 (weight qb>. In this case, the propylene content is smaller than this range ~ Copolymer A and the next copolymer B
With these combinations, a resin composition that exhibits sufficient surface impact resistance cannot be obtained when mixed with bonopropylene resin. Further, even if copolymer A having a) polypyrene content higher than this range is used, sufficient impact resistance cannot be obtained.

Jl-j 8m + 1+)kl -c-+rr platform-
J-1= &f-control%r Dimension 6rshi can be done.

First, the vanadium compound and organoaluminum compound used are the same as those described for copolymer A. However, the vanadium compound and the organoaluminum compound do not need to be brought into contact with each other at a low temperature, and may just be added to the polymerization reactor. This is because copolymer B hardly produces any low-molecular-weight copolymers that would bleed, so the molecular weight distribution cannot be further sharpened by contacting the catalyst at low temperature (although it is possible to further sharpen the molecular weight distribution during extrusion). There is no restriction in any way to bring the catalyst into contact with the catalyst at low temperature for the purpose of further improving flowability ().

Since copolymer B is a copolymer with a high ethylene content,
High polymerization activity. Therefore, the activity enhancer may not be added, but when aiming to further improve productivity, the activity enhancer can be added. In that case, the copolymer is Copolymer B can be produced. The α-olefin in the copolymer is propylene,
Examples include butene-1, hexene-1, octene-1, and the like. Preferred are propylene and butene-1. The ratio of ethylene and α-olefin in copolymer B is 65
~90/10~35 (wt%). Weight average molecular weight MY and number average molecular weight MnO ratio Mw/Mn is 1.5 =
4, preferably 2 to 3.5.

Next, a method for producing a composition having a pellet-like or crumb-like shape by mixing copolymers A and B will be described.

1) After mixing A and B copolymers using a mixer, they are formed into a sheet using a heated roll, and then pelletized using a sheet pelletizer or the like. Alternatively, after mixing in a mixer, it is crushed into small pieces in a crusher.

Furthermore, if necessary, an extruder is used to perform hot cutting, underwater cutting, strand cutting, etc., and pelletizing.

2) A1B copolymer solution (when copolymers A and B are produced by solution polymerization) is mixed, made solid by steam stripping, and made into crumbs or pellets using an extruder that also serves as a dryer. Alternatively, there may be a method in which the copolymer mixed solution is directly desolubilized using a desolubilizer, dried, and pelletized, but the method is not limited to these methods.

What is required is the mixing ratio of A and B copolymers, A:B
=40-90:10-50 (wt%), preferably 45-80:20-55 (wt%). If the copolymer B is smaller than this range, problems such as adhesion will occur even when used as pellets. Moreover, if it is too large, the impact resistance will decrease.

The pellet or crumb-like composition obtained in the present invention can be blended with a large number of resins such as polypropylene resin, polyethylene resin, polyvinyl chloride resin, polystyrene resin, ABS resin, ABS resin, polybutadiene resin, etc., and has impact resistance. It is widely used as a modifier for improving the elasticity, improving the elastic modulus, and improving the weather resistance of diene resins.

Particularly preferably, it can be blended with polypropylene resin and used as an injection molding composition.

In other words, a composition in which a pellet or crumb-like copolymer consisting of copolymers A and B is mixed with poly7゜ropylene Jugetsu i has excellent mechanical properties and impact resistance, and high hardness of molded products.・Has a 5% characteristic and also extrusion processability (flowability)
The composition is suitable for improved injection molding.

Since the composition of the present invention has a pellet or crumb-like shape, it is very easy to mix with the resin in pellet, crumb, or powder form, and can be easily mixed using a tumbler, mixer, etc. It is characterized by low cost.

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

In addition, in the examples, the propylene content was determined by infrared analysis. Mw/M11 is 80211W manufactured by Toyo Soda.
GPC power measured using the solvent 'rHII' (tetrahydrofuran) under GPC temperature and mW 1 Example 1 [Preparation of copolymer-A] 11) Catalyst adjustment thermometer, stirring device 1, external cooling device (jacket machine) ) can be poured into the polymerization reactor from the bottom of the reactor so that the internal volume in the pressure reactor is maintained at 80%. It was piped like this. Next, n-hexane 100 mA! /h
r, 0.02 of sodium oxychloride (VOCAg)
mOQ/Q -n-hexane solution at 1 mOQ/Q
hr s Ethyl aluminum sesquichloride Et 1
．． A 0.1 moQ/ton n-hexane solution of 5-AQCQ t,s was injected at a flow rate of 15 m mogv/hr, and the temperature inside the reactor was controlled at -20C. The average residence time in the reactor was 8 minutes.

(2) Polymerization A 5C stainless steel continuous polymerization reactor was equipped with a stirrer, a cooler, a gas inlet tube, and a thermometer, and was dried with a 4A molecular sheep in a Nz gas atmosphere and deoxidized by blowing N2 gas. The n-hexane obtained was introduced into the polymerization reactor at a flow rate of 4 Q/hr. Next, the dried ethylene, propylene,
Hydrogen gas converted to standard state value: 1.75jl/m, 5.4
Qi was injected through the gas introduction pipe at a flow rate of 0.05971 m. At this time, the polymerization temperature was maintained at 35C and the pressure was increased to 5C.
．． 0 k#/cm” K adjusted.

Next, the catalyst mixture prepared in 11) above was continuously introduced through a separate injection port. At the same time as adding the catalyst mixture, add 0.0% of butyl perchlorcrotonate (BPCC).
02 mo Q/It・n-hexane solution to 1 mmoQ
It was injected continuously at a flow rate of /hy. During the reaction, ethylene,
Propylene and hydrogen gas continued to be blown at the original flow rate composition. The reactant was continuously withdrawn from the extraction port attached to the bottom of the polymerization reactor so that the content inside the polymerization reactor was maintained at Z5ffi. The reaction of the extracted reaction product was stopped with a small amount of isopropyl alcohol and poured into a large amount of alcohol containing a small amount of anti-aging agent. The coagulated copolymer was dried on a hot roll at 100C. The recovered copolymer was obtained at a rate of 2109/hr.

The Mooney viscosity ML1+4 of the 00C copolymer was 32.5, and the propylene content was 673%. MY/Mn=3.3. This will be referred to as copolymer A.

[Preparation of copolymer-B]

5e stainless steel continuous polymerization reactor with stirring device, cooler,
Attach a gas inlet tube and a thermometer, and place it under a gas atmosphere.
N-hexane, which had been dried with a 4-molecular sieve and deoxidized by blowing dry N2 gas, was introduced into the polymerization reactor at a flow rate of 4 Q/hr, and dried through a tube packed with a 4-molecular sieve. Ethylene, propylene, hydrogen gas in standard state conversion value 4.2Q/ym, 3fA/ym,
The gas was blown from the gas conduit at a flow rate of 1.2t7. Next, 0.02 mm of vanadium oxychloride/VOCgs
oi/ffi-n-hexane solution at 0.7 mmoQ
/br, ethylaluminum sesquichloride/ELs
as AiCg@, 0.05mmoQ/Q -n- of s
The hexane solution was continuously injected at a flow rate of 14 mmog/hr. The temperature of the polymerization reaction was 35C1 pressure and 5 kg/
It was adjusted to an2. During the reaction, ethylene, propylene, and hydrogen gas were continuously blown in at the same flow rates and compositions as they were originally. The reactant was continuously drawn out from the outlet attached to the bottom of the polymerization reactor so that the internal volume in the polymerization reactor was maintained at 2-51. After the reaction was stopped with a small amount of isopropanol, the reaction product was poured into a large amount of methanol containing a small amount of antiaging agent. The recovered copolymer was 310
It was obtained at a rate of 9/hr. Mooney viscosity M of copolymer
L100C is 20.5, propylene content is 21.7%
That's 1÷4. Mw/Mn = 2.3. This product is referred to as copolymer B.

[Blend of copolymer A and copolymer B and production of pellets]

Copolymer A6209 obtained above and 580 g of copolymer B were blended using a 10 inch roll. The Mooney viscosity of this blend is 275 and the propylene content is 5.
It was 0.1-.

This blend was extruded into pellets using a 551III extruder equipped with a cutter.

This pellet was divided into four parts each having 2009 parts, and 1 g of the following anti-adhesion agent was added to each part.

Anti-adhesion agent ■ Sodium stearate ■ Calcium stearate θ Fine powder (10-30 μ) of high-density polyethylene O Fine powder white clay Next, put each pellet into a cylindrical container with a diameter of 20 mm.
A compression test was performed for 24 hours under a load of 42 k11/ctn''.As a result, the pellet shape was maintained even though the pellets were shifted, and no adhesion of the pellets to each other (blocking phenomenon) was observed.

Example 2 Copolymer A and copolymer B were polymerized in the same manner as in Example 1, and the copolymer solution was solution blended so that the weight ratio of the copolymer solids was 62:38. The copolymer mixture was coagulated and precipitated in methanol, and dried in the same manner as in Example 1 to obtain a copolymer mixture. The resulting copolymer had a propylene content of 49.9 inches and a Mooney viscosity of 28.0. Using this copolymer, pellets were made together in the same manner as in Example 1. Using this pellet, a blocking test was conducted at 50C in the same manner as in Example 1. As a result, all of the pellets using the four types of anti-adhesion agents retained their pellet shapes, and there was no blocking.

Comparative Example 1 Using the same method as for copolymer A in Example 1, the flow rates of ethylene, propylene, and hydrogen gas were each 2.751! /ml, 3.
517m, 0.3 Q/wig (D m t K
250 g of copolymer was obtained per hour. The propylene content of this copolymer was 50.3%, and the Mooney viscosity was 30.0.
Met. Pellets were produced using this copolymer in the same manner as in Example 1. However, when cutting into pellets using a cutter, the cut pellets adhered strongly to each other, making it difficult to form pellets. Furthermore, although the propylene content was almost the same as in Example 1, when this pellet was subjected to a compression test at 50C in the same manner as in Example 1, it was found that each of the pellets using four types of adhesives In both cases, it was found that the pellet shape was deformed and the pellets adhered to each other, causing so-called blocking, which made it impossible to make pellets.

Example 3 467 g of copolymer A obtained in Example 1 and copolymer B-5
33g were mixed in a 100c, 10fol. The propylene content of this copolymer mixture was 43%, and the Mooney viscosity was 26.0. This copolymer mixture was made into pellets in the same manner as in Example 1, and 50C
A 24 hour compression test was conducted below. As a result, the shape of the pellet was maintained, and no blocking phenomenon due to adhesion was observed.

Comparative Example 2 Using the same method as Comparative Example 1, the flow rates of ethylene, propylene, and hydrogen gas were changed to 3.5 Q/day, 3.25 Q/m, and o, respectively.
, s g/-. The propylene content of the obtained copolymer was 43.2 inches, and the Mooney viscosity was 27.0, My
/Mn = 3.5 and 280 g of copolymer was obtained per L1 hour. Made into pellets in the same manner as in Example 1,
A compression test was conducted at 0C for 24 hours. However, when cutting into pellets, the adhesion of the cut pellets and the shape after the compression test showed that the pellets lost their shape and showed a blocking phenomenon.

Example 4 In the copolymer A of Example 1, the amount of ethylene, propylene, and hydrogen gas was 1.5 Q/m, :t 81/wx.

017m, catalyst mixture't VOCIs 1.5mm
oJI/hr.

Ett, @Alcj11. s 22.5mmoffi/
175 g of copolymer A was obtained per hour in the same manner except that the BPCCt was changed to 2 mmojL/hr.

The propylene content of the copolymer was 73.5%, and the Mooney viscosity 100C was 33.0% Mw1+4/Mu = 3.5.

Copolymer A obtained by the above method and copolymer B obtained in Example 1 were blended at a ratio of 7009 to 3009 using a hot roll. The Mooney viscosity ML100C of this copolymer mixture is 29. o, 1+4 Propylene content ti was 58.3%. This copolymer mixture was made into pellets in the same manner as in Example 1, and calcium stearate was added in an amount of 0.0% per 100 parts by weight of the pellets.
5 parts were added and a compression test was conducted at 50C for 24 hours. As a result, the pellet shape was maintained.

Comparative Example 3 In the same manner as Comparative Example 1, ethylene 2.75Q/rn
itr, propylene 3,7 Q/mvr, hydrogen 0.2
The same procedure was carried out except that the flow rate was changed to Q/mit+. 9235 g of the obtained copolymer was obtained in 1 hour. The propylene content of this copolymer was 57.8%, the Mooney viscosity was 31.0, and Mw/Mn = 3.8.

This copolymer was made into pellets in the same manner as in Example 1,
Calcium stearate was added in an amount of 0.5 parts by weight per 100 parts by weight of pellets, and a compression test was conducted at 50C for 24 hours. As a result, when cut into pellets, the shape of the pellets was deformed and exhibited a blocking phenomenon, making them unsuitable as pellets.

Comparative Example 4 Using the same method as for Copolymer A of Example 1, the amount of hydrogen gas was reduced to 0.
A copolymer A was obtained in which each component was directly mixed without contacting the catalyst components in a separate reactor. The propylene content of the copolymer was 67.0 inches, and the Mooney viscosity ML100C1+4 was 330. Copolymer A obtained here and copolymer B of Example 1 were mixed in the same manner as in Example 1 to obtain a copolymer mixture. The Mooney viscosity of this copolymer mixture was 28. o, propylene content is 50.1, MW
/M n = 4.9.

Examples 5-8 1309 pellets obtained in Examples 1-4 and 520 g of commercially available polypropylene resin (Mitsubishi Yuka Noprene BC-4)
were kneaded using a kneader with an internal capacity of IQ (preheating temperature: 150 U, mixing time: 5 minutes), and then formed into a sheet using a 50 c roll.

These sheets were cut into square pellets using a cutter, and test pieces for physical property evaluation were produced using an injection molding machine. The injection molding machine is a 6.5 oz in-line screw type manufactured by Nippon Steel Corporation, and the injection molding conditions are: injection pressure - feeding pressure 500 (klicm2) secondary pressure 4
00 (ky/cm2) Injection time - 15 seconds at 12 pressures Molding temperature 240C Cooling temperature (mold temperature) 40C Cooling time 20 seconds.

ASTM test piece impact resistance, bending strength, and hardness
The results are shown in Table 1. In addition, the extrusion characteristics of the pellets used tASTM-D12
The flow characteristics were measured according to 38 and shown in Table 1.

Comparative Examples 5 to 7 The pellets obtained in Comparative Examples 1 to 3 were kneaded with polypropylene in the same manner as in Examples 5 to 8, samples for physical property evaluation were obtained using an injection molding machine, and the same tests were performed. I did this. The results are shown in Table-1.

Claims (3)

[Claims] (1) ■ An ethylene-propylene copolymer,
Its composition is ethylene:propylene:non-conjugated diene=5~
45: 55-90: 0-10 (wt%), Mooney viscosity ML 100C1+4 is 15-70, and Mw/Mn = 1.5-6 (
However, Mw indicates a weight average molecular weight, and Mu indicates a number average molecular weight. ), and ■ the composition of ethylene and α-olefin is ethylene; α-olefin = 65 to 90:
10 to 35 (wt%), Mooney viscosity ML180
C is 10 to 70, and MW/Mn = 1+4 1.5 to 4, and the A and B components are mixed in a composition ratio A:B = 40 to 90:18-e A / !
JL it
Heavy I! An olefin copolymer composition characterized by: (2) The olefin copolymer composition according to claim 1, wherein the α-olefin of copolymer B is propylene or Bugun-1. (3) The olefin copolymer composition according to claim 1, wherein copolymer A is produced using a catalyst and an activity improver obtained by contacting a vanadium compound and an organoaluminum compound at below OC. thing.