JP2851897B2 - Ethylene / α-olefin copolymer - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to an ethylene / α-olefin copolymer, and more particularly, it has excellent impact resistance when formed into a film by satisfying specific requirements, and is transparent. The present invention relates to a novel ethylene / α-olefin copolymer which is excellent in properties, has a remarkably small change in transparency before and after heat treatment, and also has excellent blocking resistance between films.

Technical background of the invention Linear low density polyethylene (LLDPE), which is a copolymer of ethylene and α-olefin, has superior impact strength when formed into a film as compared with high pressure method low density polyethylene (LDPE). Therefore, it is widely used as a raw material for film forming. In particular, there is an attempt to use an α-olefin having a large carbon number as a comonomer with the aim of further improving the impact strength of the film. However, at that time, there was a problem that the blocking resistance of the film was considerably lowered, and further, the transparency of the film was significantly lowered by the heat treatment. In particular, in the case of lamination films, in order to increase the dimensional stability accuracy, it is common practice to perform an aging operation at a temperature of about 40 ° C. after forming the film. Was sometimes reduced in transparency.

The present inventors have conducted intensive studies to solve the problems associated with the above-mentioned ethylene / α-olefin copolymer film, and found that ethylene and α-olefin having 6 to 12 carbon atoms were present in the presence of a specific catalyst. When an ethylene / α-olefin copolymer that satisfies the specific requirements obtained by copolymerization below is formed into a film, the resulting film has excellent impact resistance and blocking resistance, and transparency due to heat treatment. The present invention has been completed by finding that the decrease in the temperature can be greatly suppressed.

Object of the Invention The present invention has been made in view of the prior art as described above, and when formed into a film, has excellent impact resistance, and also has excellent transparency and a significant change in transparency before and after heat treatment. It is an object of the present invention to provide a novel ethylene / α-olefin copolymer which has a small amount and is also excellent in blocking resistance between films.

SUMMARY OF THE INVENTION The ethylene / α-olefin copolymer according to the present invention is:
It is a copolymer of ethylene and an α-olefin having 6 to 12 carbon atoms, and satisfies the following requirements (A) to (D).

(A) the melt flow rate measured by ASTM D 1238E is 0.01-100 g / 10 min; and (B) the density measured by ASTM D 1505 is 0.88-0.9.
4 g / cm ³ , (C) a constituent unit derived from an α-olefin is 1 to 20% by weight, and (D) the copolymer is melted at 200 ° C., and a temperature decreasing rate is 0.31%.
Obtained when the temperature is gradually increased from 10 ° C to 200 ° C at a rate of 10 ° C / min from DSC using a 0.5 mm thick sheet crystallized by cooling slowly to 50 ° C at 50 ° C / min. The DSC melting peak pattern has two melting peaks, and the ratio Hh / Hl of the high-tone peak height Hh to the low-temperature peak height Hl and the density of the copolymer satisfy the following formula.

a) When the α-olefin is an α-olefin having 6 to 7 carbon atoms: 0 <Hh / Hl <1.2 (where Hh represents the peak height on the high temperature side and Hl represents the peak height on the low temperature side. B) when the α-olefin is an α-olefin having 8 to 9 carbon atoms; 0 <Hh / Hl <60d−52.4 (where Hh is the peak height on the high temperature side, and Hl is the peak height on the low temperature side) And d represents the density of the copolymer.) C) When the α-olefin is an α-olefin having 10 to 12 carbon atoms; 0 <Hh / Hl <60d-52.0 (where Hh is the high temperature side) The peak height, Hl represents the peak height on the low temperature side, and d represents the density of the copolymer.) The ethylene / α-olefin copolymer according to the present invention comprises:
Since it satisfies the above-mentioned various properties, it is excellent in impact resistance when formed into a film, excellent in transparency, has a remarkably small change in transparency before and after heat treatment, and is also excellent in blocking resistance between films.

DETAILED DESCRIPTION OF THE INVENTION Hereinafter, the ethylene / α-olefin copolymer according to the present invention will be specifically described. Ethylene according to the present invention
α-olefin copolymer is composed of ethylene and α having 6 to 12 carbon atoms.
-It is a random copolymer obtained by copolymerizing olefin with a specific catalyst. The ethylene / α-olefin copolymer according to the present invention has ethylene and 61 carbon atoms.
In addition to the α-olefin of 2, a small amount of another α-olefin or polyene may be copolymerized. Here, as the other α-olefin, for example, propylene, 2-methylpropylene, 1-butene, pentene-1, 3-methyl-1-butene, 2-methyl-1-butene and the like can be mentioned. Examples of the polyene include butadiene, isoprene, 1,4-hexadiene, dicyclopentadiene, and 5-ethylidene-2-norbornene.

The ethylene / α-olefin copolymer according to the present invention,
The melt flow rate (MFR) measured by ASTM D 1238E is from 0.01 to 100 g / 10 min, preferably from 0.05 to 50 g / 10 min. If the MFR is less than 0.01 g / 10 minutes, the moldability of the copolymer will decrease, and the transparency of the resulting film will tend to decrease.If the MFR exceeds 100 g / 10 minutes, mechanical properties will increase. A tendency for the mechanical strength to decrease.

The ethylene / α-olefin copolymer according to the present invention,
Density 0.88~0.94g / Cm ^3, preferably 0.89~0.93g / Cm ^3. Here, the density is a value measured according to ASTM D 1505.

In the ethylene / α-olefin copolymer according to the present invention, the constituent unit derived from the α-olefin having 6 to 12 carbon atoms is 1 to 25% by weight, preferably 4 to 23% by weight, particularly preferably 6 to 20% by weight. %, And the constituent unit derived from ethylene is 75 to 99% by weight, preferably 77 to 96% by weight,
Particularly preferably, it is present in an amount of from 80 to 94% by weight.

In the ethylene / α-olefin copolymer, as described above, the constituent unit derived from ethylene and α-olefin other than α-olefin having 6 to 12 carbon atoms is 10% by weight or less, preferably 5% by weight or less. And particularly preferably 2
It can be included in amounts up to wt%.

200 ° C. ethylene / α-olefin copolymer of the present invention
After heating and melting to a temperature of 10 ° C / min, a 0.5 mm thick sheet obtained by cooling and crystallizing at a cooling rate of 10 ° C / min was used as a sample at a heating rate of 10 ° C / min from 10 ° C using DSC. 200 ℃
The DSC melting peak pattern obtained when the temperature was raised to 3
Are shown (FIG. 2). On the other hand, the thickness obtained by heating and melting the ethylene / α-olefin copolymer according to the present invention to 200 ° C., and then ultra-slowly cooling to 50 ° C. at a rate of 0.31 ° C./min to crystallize. 0.5mm sheet (below,
The sample obtained in this way is referred to as “super slow cooling sample”
10 ° C to 10 ° C / mi using DSC
The DSC melting peak pattern obtained when the temperature is raised to 200 ° C. at a heating rate of n has two melting peaks, and has a high-temperature side peak height Hh, a low-temperature side peak, and a high-temperature side The ratio Hh / Hl of the peak height Hh to the low-temperature-side peak height Hl and the density d of the copolymer satisfy the following formula.

(FIG. 1) a) When the α-olefin is an α-olefin having 6 to 7 carbon atoms: 0 <Hh / Hl <1.2 ... [Ia], preferably 0 <Hh / Hl <1.0 ... [I '-A] particularly preferably 0 <Hh / Hl <0.8... [I ″ -a] (where Hh represents the peak height on the high temperature side and Hl represents the peak height on the low temperature side.) B) The α- When the olefin is an α-olefin having 8 to 9 carbon atoms; 0 <Hh / Hl <60d-52.4 ... [Ib], preferably 0 <Hh / Hl <60d-52.8 ... [I'-b] Particularly preferred Is 0 <Hh / Hl <60d−53.2 ... [I ″ -b] (where Hh represents the peak height on the high temperature side, Hl represents the peak height on the low temperature side, and d represents the density of the copolymer.) c) when the α-olefin is an α-olefin having 10 to 12 carbon atoms: 0 <Hh / Hl <60d-52.0 ... [Ic], preferably 0 <Hh / Hl <60d-52.4 ... [I ′] -C] Particularly preferably, 0 <Hh / Hl <60d-52.8 ... [I "-c] (where Hh represents the peak height on the high temperature side, Hl represents the peak height on the low temperature side, and d represents the density of the copolymer.) Here, the DSC melting of the ultra-slowly cooled sample The analysis of the peak pattern was performed by comparing the high-temperature side
A tangent was drawn from a point on the melting curve at ° C. as a starting point, a vertical line was drawn from the peak maximum point to the base line using this as a baseline, and the distance between this intersection point and the peak maximum point was defined as the peak height.

Next, the method for producing the ethylene / α-olefin copolymer according to the present invention will be described.

The ethylene / α-olefin copolymer according to the present invention,
It can be produced by copolymerizing ethylene and an α-olefin in the presence of, for example, an olefin polymerization catalyst as described below.

The olefin polymerization catalyst used in producing the ethylene / α-olefin copolymer according to the present invention includes, for example, [A] a liquid titanium catalyst component comprising a halogen-containing magnesium compound, oleyl alcohol and a titanium compound, and [ B] It is formed from a halogen-containing organoaluminum compound.

As the halogen-containing magnesium, magnesium chloride, magnesium bromide, magnesium iodide, and magnesium fluoride are used, and among them, magnesium chloride is particularly preferably used.

As the titanium compound, _four titanium compounds represented by Ti (OR) _g X _4-g (where R is a hydrocarbon group, X is a halogen, and g is 0 to 4) are used. .

As such a titanium compound, specifically, TiCl
₄ , titanium halides such as TiBr ₄ and TiI ₄ ; Ti (OCH ₃ ) Cl ₃ , Ti (OC ₂ H ₅ ) Cl ₃ , Ti (O-iC ₃ H ₇ ) Cl ₃ , Ti (O-nC _{4 H 9) Cl 3, Ti (} OC 2 H 5) Br 3, Ti (O-iC 3 H 7) Br 3, Ti (O-iC 4 H 9) trihalide, alkoxy titanium such as Br _3; Ti (OCH ₃ ) ₂ Cl ₂ , Ti (OC ₂ H ₅ ) ₂ Cl ₂ , Ti (O-iC ₃ H ₇ ) ₂ Cl ₂ , Ti (O-nC ₄ H ₉ ) ₂ Cl ₂ , Ti (OC ₂ H ₅ ) dihalogenated alkoxy titanium such as ₂ Br _2; T
i (OCH ₃ ) ₃ Cl, Ti (OC ₂ H ₅ ) ₃ Cl, Ti (O-iC ₃ H ₇ ) ₃ Cl, Ti (O-nC ₄ H ₉ ) ₃ Cl, Ti (OC ₂ H ₅ ) ₃ Monohalogenated trialkoxy titanium such as Br; Ti (OCH ₃ ) ₄ , Ti (OC ₂ H ₅ ) ₄ , Ti (O-nC ₃ H ₇ ) ₄ , Ti (O-iC ₃ H ₇ ) ₄ , Ti ( O-nC ₄ H ₉ ) ₄ , Ti (OC ₆ H ₁₃ ) ₄ , Ti (OC ₆ H ₁₁ ) ₄ , Ti (OC ₈ H ₁₇ ) ₄ , Ti (OCH ₂ (C ₂ H ₅ ) CHC ₄ H _{9 4} , Ti (OC ₉ H ₁₉ ) ₄ , Ti [OC ₆ H ₃ (CH ₃ ) ₂ ] ₄ , Ti (OC ₁₈ H ₃₅ ) ₄ , Ti (OCH ₃ ) ₂ (OC ₄ H ₉ ) ₂ , Ti (OC ₃ H ₇ ) ₃ (OC ₄ H ₉ ), Ti (OC ₂ H ₅ ) ₂ (OC ₄ H ₉ ) ₂ , Ti (OC ₂ H ₅ ) ₂ (O-iC ₃ H ₇ ) ₂ , Ti ( Tetraalkoxy titanium such as OC ₂ H ₅ ) (OC ₁₈ H ₃₅ ) ₃ , Ti (OC ₂ H ₅ ) ₂ (OC ₁₈ H ₃₅ ) ₂ , Ti (OC ₂ H ₅ ) ₃ (OC ₁₈ H ₃₅ ) Examples can be given. Among these, 1 ≦ g ≦
4 is preferable, 2 ≦ g ≦ 4 is more preferable, and tetraalkoxytitanium is particularly preferably used.

The titanium catalyst component [A] used in producing the ethylene / α-olefin copolymer according to the present invention, which is in a liquid state, is substantially composed of the above-mentioned halogen-containing magnesium, oleyl alcohol and the above-mentioned titanium compound. A homogeneous solution.

As the titanium catalyst component [A] in a liquid state, it is preferable to prepare a mixture of, for example, halogen-containing magnesium and oleyl alcohol, and then contact the mixture with a titanium compound. The mixture comprising the halogen-containing magnesium and oleyl alcohol may be in a solution state or a suspension state, but is preferably in a solution state. Further, a method of changing the solution state while mixing the three is also preferred.

[A] When preparing a titanium catalyst component in a liquid state,
40 ° C or higher, preferably 40 to 200 ° C, more preferably 50 to 1
It is desirable that the mixture comprising the halogen-containing magnesium and oleyl alcohol is brought into contact with the titanium compound at 50 ° C. for 1 minute or more, preferably for 15 minutes to 24 hours, and particularly preferably for 30 minutes to 15 hours, and reacted.

[A] The titanium catalyst component in a liquid state is obtained by simultaneously mixing halogen-containing magnesium, oleyl alcohol and a titanium compound at 40 ° C. or higher, preferably 40 to 200 ° C., more preferably 50 to 150 ° C., for 1 minute or longer, preferably 15 to 150 ° C. It can also be prepared by contacting and reacting for minutes to 24 hours, particularly preferably for 30 minutes to 15 hours.

In preparing the titanium catalyst component in a liquid state comprising a halogen-containing magnesium, a titanium compound and oleyl alcohol, a hydrocarbon solvent may be used.

That is, the halogen-containing magnesium compound and oleyl alcohol may be dissolved in the hydrocarbon solvent and then contacted with the titanium compound, or the halogen-containing magnesium compound, oleyl alcohol and titanium compound may be dissolved and contacted in the hydrocarbon solvent.

Examples of such a hydrocarbon solvent include aliphatic hydrocarbons such as pentane, hexane, heptane, octane, decane, dodecane, tetradecane, and kerosene; cyclopentane, methylcyclopentane, cyclohexane, methylcyclohexane, cyclooctane, and cyclohexene. Alicyclic hydrocarbons; aromatic hydrocarbons such as benzene, toluene, xylene, ethylbenzene, cumene and cymene; halogenated hydrocarbons such as dichloroethane, dichloropropane, trichloroethylene, carbon tetrachloride and chlorobenzene; Used.

The halogen-containing magnesium, titanium compound and oleyl alcohol are preferably used in the following amounts.

Oleyl alcohol / MgCl ₂ usually has a molar ratio of 2 to 4
Preferably it is 2-3.

Titanium compound / MgCl _2, the 0.04 to 0.30 preferably in the usual molar ratio is 0.05 to 0.20.

Oleyl alcohol / titanium compound is 5 to 10 in molar ratio.
0 is preferably 10 to 80.

[B] The halogen-containing organoaluminum used in producing the ethylene / α-olefin copolymer according to the present invention includes dialkylaluminum halides such as diethylaluminum chloride, dibutylaluminum chloride and diethylaluminum bromide; ethylaluminum sesquichloride Alkyl aluminum sesquihalides such as butyl aluminum sesquichloride and ethyl aluminum sesquibromide; partially halogenated alkyl aluminum such as alkyl aluminum dihalides such as ethyl aluminum dichloride, propyl aluminum dichloride and butyl aluminum dibromide; ethyl aluminum ethoxy Chloride, butylaluminum butoxycyclolide, ethylaluminum ethoxybromide How partly can be mentioned alkoxylated and halogenated alkylaluminum.

In addition to these halogen-containing organic Al compounds, halogen-free organic Al compounds can also be used, for example, trialkylaluminums such as triethylaluminum and tributylaluminum; trialkenylaluminums such as triisoprenylaluminum; diethylaluminum ethoxide Dialkylaluminum alkoxides such as dibutylaluminum butoxide; alkylaluminum sesquialkoxides such as ethylaluminum sesquiethoxide and butylaluminum sesquibutoxide; partially alkoxylated having an average composition represented by R ¹ _2.5 Al (OR ² ) _0.5 Alkyl aluminum; dialkyl aluminum hydride such as diethyl aluminum hydride and dibutyl aluminum hydride; ethyl aluminum And other partially hydrogenated alkylaluminums such as alkylaluminum dihydrides such as uranium dihydride and propylaluminum dihydride, and similar compounds. An organic aluminum compound to which aluminum is bonded can be given. Such compounds include, for example, Methyl aluminoxane and the like can be mentioned.

Further, the halogen-free organic Al compounds include
Complexes of group metals and aluminum can also be used,
Such compounds include LiAl (C ₂ H ₅ ) ₄ , LiAl (C ₇ H ₁₅ )
_{4 and the} like.

Among these, it is particularly preferable to use trialkylaluminum or alkylaluminum to which two or more aluminum compounds described above are bonded. These halogen-free organic Al compounds can be used together with the halogen-containing organic aluminum compound in an amount of 70 mol% or less, preferably 40 mol% or less, particularly preferably 10 mol% or less.

The ethylene / α-olefin copolymer according to the present invention,
It is obtained by performing a polymerization reaction in a hydrocarbon solvent using the catalyst component. Examples of the hydrocarbon solvent include aliphatic hydrocarbons such as pentane, hexane, heptane, octane, decane, dodecane and kerosene and halogen derivatives thereof; alicyclic hydrocarbons such as cyclohexane, methylcyclopentane and methylcyclohexane and halogen derivatives thereof; Examples thereof include aromatic hydrocarbons such as benzene, toluene, and xylene, and halogen derivatives such as chlorobenzene. Further, the olefin itself used for the polymerization can be used as a liquid medium.

In carrying out the polymerization reaction, titanium atoms are contained in an amount of 0.0005 to about 1 mmol, more preferably about 0.005 mol per reaction volume.
1 to about 0.5 mmol, and the organoaluminum compound may be used in an aluminum / titanium (atomic ratio) of about 1 to about 2000, preferably about 5 to about 100. The polymerization temperature of the olefin is about 20 to about 300 ° C, preferably about 65 ° C.
~ 250 ° C. The polymerization pressure is from atmospheric pressure to 300
It is preferably 0 kg / cm ² -G, preferably 2 to about 100 kg / cm ² -G, particularly preferably about 5 to about 50 kg / cm ² -G.

In olefin polymerization, it is preferable to make hydrogen coexist in order to control the molecular weight. The polymerization can be carried out batchwise or continuously. Further, it can be performed in two or more stages under different conditions.

The ethylene / α-olefin copolymer according to the present invention,
Excellent in transparency, impact resistance, tear resistance, blocking resistance, low-temperature heat sealability, heat resistance and stress crack resistance, and well-balanced with these excellent properties, especially suitable as a packaging film However, it is not limited to use as a film, but can be processed into various molded articles such as containers, daily necessities, pipes and tubes by T-die molding, blown film molding, hollow molding, radiation molding, extrusion molding, and the like. Further, it can be formed into various composite films by extrusion coating or co-extrusion molding on other films, and it is also used for applications such as steel pipe covering materials, electric wire covering materials, and foam molded products. Alternatively, other heat depopulated resins, such as high density polyethylene,
Medium density polyethylene, polypropylene, poly 1-butene, poly 4-methyl-1-pentene, low crystalline or amorphous copolymer of ethylene and propylene or 1-butene, propylene / 1-butene copolymer, etc. Can be used by blending with the polyolefin.

The ethylene / α-olefin copolymer obtained as described above contains a heat stabilizer, a weather stabilizer, if necessary.
An antistatic agent, an antiblocking agent, a lubricant, a nucleating agent, a pigment, a dye, an inorganic or organic filler, and the like can also be blended.

Effect of the Invention The ethylene / α-olefin copolymer according to the present invention is:
Since it satisfies the specific requirements as described above, when formed into a film, it has excellent impact resistance and transparency, has very little change in transparency before and after heat treatment, and also has excellent blocking resistance between films.

EXAMPLES Hereinafter, the present invention will be described with reference to Examples, but the present invention is not limited to these Examples.

Example 1 [Preparation of Titanium Catalyst Component (A)] 476 g of commercially available anhydrous magnesium chloride was added under a nitrogen atmosphere.
-Suspended in 10 l of decane, 4.0 kg of oleyl alcohol was added and reacted at 135 ° C. for 5 hours with stirring. As a result, a colorless transparent liquid was obtained.

After the temperature of this solution was lowered to 110 ° C., 0.45 mol of Ti (OC ₂ H ₅ ) ₄ was added, and the reaction was continued at 110 ° C. for 5 hours. The resulting solution was stored at room temperature.

[Polymerization] Using a continuous polymerization reactor having an internal volume of 200 L, dehydrated and purified hexane was 100 L / Hr, ethyl aluminum sesquichloride 17.2 mmol / Hr, and the catalyst obtained above was converted to Ti atoms at 0.43 mmol / Hr. It was fed continuously at a rate. At the same time, ethylene 13 kg / Hr, 1-hexene 6.7 kg / Hr,
Hydrogen was continuously supplied at a rate of 11.3 l / Hr, and the polymerization temperature was 170
The copolymerization was carried out under the conditions of ° C, a total pressure of 31 kg / cm ² -G, a residence time of 1 hour, and a solvent concentration of 105 g / l with respect to the solvent hexane. The catalytic activity corresponded to 23800 g-copolymer / mmol-Ti. The polymerization conditions and results are shown in Table 1, and the film properties of the obtained copolymer are shown in Table 2.

Example 2 and Comparative Examples 1-2 In Example 1, as shown in Table 1, polymerization was carried out with some polymerization conditions changed. The polymerization conditions are shown in Table 1, and the physical properties of the film are shown in Table 2.

Comparative Example 3 [Preparation of Titanium Catalyst Component (A)] Under a nitrogen atmosphere, 1 mol of commercially available anhydrous magnesium chloride was suspended in 2 l of dehydrated and purified hexane, and 6 mol of ethanol was added dropwise with stirring over 1 hour. For 1 hour. To this, 2.6 mol of diethylaluminum chloride was added dropwise at room temperature, and stirring was continued for 2 hours. Then, after 6 mol of titanium tetrachloride was added, the system was heated to 80 ° C. and reacted while stirring for 3 hours. The solid part after the reaction is separated,
The catalyst was obtained by repeated washing with purified hexane.

Table 2 shows the results of evaluating the physical properties of the film obtained by polymerization under the conditions shown in Table 1.

[Granulation] The obtained copolymer was mixed with Irganox 1076 manufactured by Ciba-Geigy.
(0.20% by weight), calcium stearate (0.10% by weight) and silica (0.10% by weight) were added, and granulation was performed.

[Method of Making and Evaluating Film] A commercially available T-die film forming machine equipped with a 65 mmφ extruder was used to form a film having a width of 420 mm and a thickness of 0.04 mm. The molding was performed at a resin temperature of 235 ° C., a screw rotation speed of an extruder of 40 rpm, a chill roll temperature of 35 ° C., a film forming speed of 20 m / min, and a draft ratio of 0.057.

[Measurement Method] The following methods were used for measurement of film physical properties.

(1) Haze: According to ASTM D 1003.

(2) Gloss: According to ASTM D 523.

(3) Blocking: 10 in a 50 ° C oven according to ASTM D 1893
The film which was allowed to stand for 7 days with a kg load was measured.

(4) Tear strength: According to JIS Z 1702.

(5) Impact strength: according to JIS P 8134.

(6) Heat seal: 100 ° C, 105 ° C, 110 ° C, 115 ° C, 120 ° C, 125 ° C, 130 ° C using a Toyo Seiki heat sealer
Sealing was performed at the upper seal bar temperature. Heat sealing at each temperature was performed at n = 5, and the seal sample was peeled off using an Instron universal testing machine at a distance between chucks of 30 mm and a crosshead speed of 300 mm / min. The lowest temperature at which n = 3 or more out of n = 5 when the peeling form was not the peeling but the heat seal portion cut or the raw material cut was taken as the minimum complete heat seal temperature. The details of the heat sealing conditions are shown below.

i. Seal pressure: 2kg / cm ² ii. Seal time: 1 second iii. Upper seal bar temperature: 100 ° C, 105 ° C, 110 ° C, 115 ° C, 120 ° C, 125 ° C, 130 ° C iv. Lower seal bar temperature: 70 ° C v. Test piece: 120 × 15mm vi. Seal width: 10mm

[Brief description of the drawings]

FIG. 1 is a DSC melting peak pattern obtained by measuring the “super-slowly cooled sample” of the ethylene / hexene-1 copolymer according to the present invention under ordinary measurement conditions, and FIG. 4 is a DSC melting peak pattern obtained by measuring the ethylene-hexene-1 copolymer under ordinary measurement conditions.

Continuing from the front page (72) Inventor Masaya Yamada 3 Chigusa Kaigan, Ichihara-shi, Chiba Mitsui Oil Chemical Industry Co., Ltd. (72) Inventor Seiichi Ikeyama 6-1-2 Waki, Waki-cho, Kuga-gun, Yamaguchi Prefecture Mitsui Oil Inside Chemical Industry Co., Ltd. (72) Inventor Yoshinori Akana 61-2, Waki, Waki-machi, Kuga-gun, Yamaguchi Prefecture Inside Mitsui Petrochemical Industry Co., Ltd. (56) References JP-A-1-292010 (JP, A) JP-A-62-57406 (JP, A) JP-A-62-57407 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) C08F 10/00-10/14 C08F 210/00 -210/18 C08F 4/60-4/70

Claims (2)

(57) [Claims] 1. An ethylene / α-olefin copolymer obtained by copolymerizing ethylene and an α-olefin having 6 to 12 carbon atoms, and satisfying the following requirements (A) to (D): (A) a melt flow rate measured by ASTM D 1238E of 0.01 to 100 g / 10 min, and (B) a density measured by ASTM D 1505 of 0.88 to 0.9
4 g / cm ³ , (C) a constituent unit derived from an α-olefin is 1 to 20% by weight, and (D) the copolymer is melted at 200 ° C., and a temperature decreasing rate is 0.31%.
Obtained when the temperature is gradually increased from 10 ° C to 200 ° C at a rate of 10 ° C / min from DSC using a 0.5 mm thick sheet crystallized by cooling slowly to 50 ° C at 50 ° C / min. The DSC melting peak pattern has two melting peaks, and the ratio Hh / Hl of the high-tone peak height Hh to the low-temperature peak height Hl and the density of the copolymer satisfy the following formula. a) When the α-olefin is an α-olefin having 6 to 7 carbon atoms: 0 <Hh / Hl <1.2 (where Hh represents the peak height on the high temperature side and Hl represents the peak height on the low temperature side. B) when the α-olefin is an α-olefin having 8 to 9 carbon atoms; 0 <Hh / Hl <60d−52.4 (where Hh is the peak height on the high temperature side, and Hl is the peak height on the low temperature side) And d represents the density of the copolymer.) C) When the α-olefin is an α-olefin having 10 to 12 carbon atoms; 0 <Hh / Hl <60d-52.0 (where Hh is the high temperature side) The peak height, Hl is the low-temperature peak height, and d is the density of the copolymer.) 2. A film comprising the ethylene / α-olefin copolymer according to claim 1.