JP2000038483A - Ethylene-alfa-olefin copolymer composition and film therefrom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an ethylene-α-olefin copolymer composition that has excellent flexibility and drawing processability, an expanded drawable temperature range and is useful as a packaging film for goods and articles by using specific ethylene-α-olefin copolymers having different densities. SOLUTION: The objective composition comprises (A) 40-85 wt.% of an ethylene-α-olefin copolymer that includes the α-olefins of 3-12 carbon atoms, has a MFR of 0.1-50 g/10 min, a density (d) of 0.880-0.915 g/cm3; (B) 60-15 wt.% of an ethylene-α-olefin copolymer that includes the α-olefin of 3-12 carbon atoms, has a MFR of 0.1-50 g/10 min, a density (d) of 0.915-0.940 where the amorphous fraction is >=65% at 80 deg.C and <=95% at 100 deg.C according to the formula [Fa(T) is the amorphous fraction at T deg.C; Fa(20) means the amorphous fraction at 20 deg.C represented by 1-ΔHs/ΔHu]; ΔHs is the heat of fusion of the sample; ΔHu is the heat of crystal fusion at equilibrium (292.9 J/g); ΔHTi is the accumulated heat of fusion at Ti deg.C].

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ethylene / α-olefin copolymer composition which is flexible and excellent in stretch formability and a film thereof. More specifically, the present invention relates to an ethylene / α-olefin copolymer composition and a film used for a film for packaging products such as fruits and vegetables, fresh fish, stationery, and office supplies.

[0002]

2. Description of the Related Art In recent years, food packaging films such as fruits and vegetables, fresh fish, fresh meat, and prepared foods have high strength and excellent transparency to protect and confirm the contents and to make products look beautiful. Stretched films such as vinyl are widely used.

[0003] However, a stretched film using polypropylene has high rigidity and transparency, but is inferior in flexibility and is easily broken when an impact force is applied. Stretched films using polyvinyl chloride are excellent in flexibility and transparency, but generate hydrogen chloride gas when incinerated, and have problems such as safety and health and environmental pollution. For this reason, as a film to replace polypropylene and polyvinyl chloride, those based on ethylene-based polymers such as ethylene-α-olefin copolymer and ethylene-vinyl acetate copolymer are being actively developed. Some biaxially stretched films are commercially available.

[0004] Ethylene / α-olefin copolymers are relatively excellent in stretchability, but the stretchable temperature range is narrow, and if the stretch temperature is low, the stretch cannot be performed. Therefore, there was a problem that the film was partially thinned and torn. Japanese Patent Publication No. 5-30855 describes that 0.90
90 to 50% by weight of 0.93 g / cm ³ of the ethylene / α-olefin copolymer (A), and 0.87 to 0.91 g /
Although polyethylene shrink film consisting of a mixture of 0.014 g / cm ³ or more smaller ethylene · alpha-olefin copolymer 10 to 50 wt% than the density of and in cm ³ (A) is disclosed, which can be stretched The temperature range was narrow and the low temperature stretchability was insufficient.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide an ethylene / α-olefin copolymer composition which is flexible and has excellent stretch moldability and a temperature at which an ethylene / α-olefin copolymer having poor stretchability can be stretched. It is an object of the present invention to extend the range and to provide a film for protecting the contents and making the product look beautiful.

[0006]

Means for Solving the Problems In view of such circumstances, the present inventors have conducted intensive studies on the above-mentioned problems, and as a result, have found that a resin composition containing two types of specific ethylene / α-olefin copolymers having different densities. It has been found that an ethylene / α-olefin copolymer composition having an amorphous fraction at a specific temperature and a specific value and a film thereof achieves the object of the present invention, and completed the present invention. .

That is, the present invention provides the following (a-1) to (a-3)
40 to 85% by weight of an ethylene / α-olefin copolymer (A) component having the following properties, and an ethylene / α-olefin copolymer (B) having the following properties (b-1) to (b-3): )
An ethylene / α-olefin copolymer composition containing 60 to 15% by weight of a component, having an amorphous fraction at 80 ° C. of 65% or more according to the following (formula 1),
Is an ethylene / α-olefin copolymer composition characterized by having an amorphous fraction of 95% or less. Component (A): (a-1) carbon number of α-olefin: 3 to 12 (a-2) melt flow rate (MFR): 0.1 to 50 g
/ 10 min (a-3) Density (d): 0.880 g / cm ³ or more and 0.91
Less than 5 g / cm ³ Component (B): (b-1) Carbon number of α-olefin: 3 to 12 (b-2) Melt flow rate (MFR): 0.1 to 50 g
/ 10 min (b-3) Density (d): 0.915 g / cm ³ or more and 0.94
0 g / cm ³ or less Fa (T) = Fa (20) + (ΔHTi / ΔHs) × (1-Fa (20)) (Equation 1) (wherein, Fa (T) is an amorphous fraction at T ° C., Fa (20)
Is the amorphous fraction at 20 ° C. (1−ΔHs / ΔHu), ΔHs
Is the heat of fusion of the sample, ΔHu is the heat of fusion of the equilibrium crystal (29
2.9 J / g), and ΔHTi represents the accumulated heat of fusion at Ti ° C. )

Further, the present invention is an ethylene / α-olefin copolymer composition for a stretched film, comprising the above-mentioned ethylene / α-olefin copolymer composition. The present invention also provides a film comprising the ethylene / α-olefin copolymer composition. Further, the present invention provides the above-mentioned ethylene / α for stretched film.
-It is a stretched film characterized by comprising an olefin copolymer composition. Hereinafter, the present invention will be described in detail.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Ethylene α-
The olefin copolymer (A) is a copolymer of ethylene and one or more α-olefins having 3 to 12 carbon atoms.
Specific examples of the α-olefin include propylene, butene-1, pentene-1, hexene-1, heptene-1, octene-1, nonene-1, decene-1, dodecene-1,
4-methyl-pentene-1,4-methyl-hexene-
1, vinylcyclohexane, vinylcyclohexene, styrene, norbornene, butadiene, isoprene and the like. The content of α-olefin is usually 20 mol%
It is as follows.

The ethylene / α-olefin copolymer
The density of (A) is 0.880 g / cm^Three0.915 or more
g / cm^ThreeLess than 0.890 g / cm^Threethat's all
0.915 g / cm^ThreeLess than, more preferably 0.89
5g / cm^Three0.910 g / cm or more ^ThreeIs less than and
Its melt flow rate (MFR) is 0.1-50 g /
10 minutes, preferably 0.5 to 10 g / 10 minutes, more preferably
Preferably, it is 1 to 5 g / 10 minutes. The density is 0.880
g / cm^ThreeIf it is smaller than this, the rigidity will be too low.
Use it as a packaging film from the point of handling
Not suitable for On the other hand, the density is 0.915 g / cm^ThreeLess than
In the case above, the target temperature range where stretching is possible becomes narrow.
Not preferred. The density referred to here is JIS K67
It is measured by the method specified in 60-1981.

The value of the melt flow rate is 0.1 g / 10
If it is smaller than the minute, the extrusion load becomes too high at the time of forming a stretched film, which is not preferable. On the other hand, when this value exceeds 50 g / 10 minutes, the film may be broken at the time of stretching, thereby causing a decrease in stretchability.
The melt flow rate referred to in the present invention is JIS K67
According to the method specified in 60-1981, the load 2.1
6 kg, the measurement temperature is a value measured under the condition of 190 ° C.

The ethylene / α-olefin copolymer (A) is prepared by subjecting the above monomers and comonomers to a solution polymerization method, a slurry polymerization method, a high pressure ion polymerization method, a gas phase method using a Ziegler-Natta catalyst or a metallocene catalyst. Obtained by a polymerization method.

The ethylene / α-olefin copolymer (A) used in the present invention preferably further satisfies the following (a-4) to (a-6). (a-4) Composition distribution variation coefficient C obtained from the following (Equation 2)
x is 0.5 or less Cx = σ / SCBave. (Equation 2) (where σ is the standard deviation of the composition distribution, SCBave. is 100)
The average value of the short chain branch per 0C (1 / 1000C) is shown. (A-5) The weight ratio a (% by weight) of the cold xylene-soluble portion is as follows.
A <4.8 × 10 ⁴ × (0.95-d) ³ +10 ⁶ × (0.95-d) ⁴ +1 (Formula 3) (where a is the weight ratio of the cold xylene-soluble portion) a (% by weight),
d is the density of the ethylene / α-olefin copolymer (g / c
m ³ ). (A-6) The proportion of components eluted at an elution temperature of 88 ° C or higher in the composition distribution curve is 10% by weight or less.

The composition distribution variation coefficient Cx mentioned here indicates a measure of the composition distribution, and the smaller the value, the narrower the composition distribution. When the composition distribution variation coefficient Cx is 0.
5 or less, more preferably 0.2 to 0.45. Composition distribution variation coefficient Cx is 0.5
When the content is below, the ethylene / α-olefin copolymer composition of the present invention has a wider temperature range in which stretching is possible, which is preferable.

The outline of the measurement of the composition distribution variation coefficient Cx is as follows. A column filled with sea sand in a column oven by dissolving the ethylene / α-olefin copolymer (A) used in the present invention in an ODCB solvent heated to a predetermined temperature of 140 ° C. using a multifunctional LC manufactured by Tosoh Corporation put in,
Reduce oven temperature to -14 ° C. Subsequently, the temperature is raised to a predetermined temperature, and the relative concentration and short-chain branching degree of the copolymer distilled out during that time are measured by FT-IR connected to a column. The temperature is raised to the final temperature while obtaining the relative concentration and short-chain branching degree of the copolymer distilled out during that time. A composition distribution curve is obtained from the obtained relative concentration and the degree of short-chain branching, and a composition distribution curve is obtained from the relative concentration and the elution temperature. The standard deviation of the composition distribution curve is represented by σ, and the average branching degree (Σ (SCB × each SCB)
) Is defined as SCBave, and the composition distribution variation coefficient Cx was calculated by the above equation.

[0016] The cold xylene-soluble portion referred to herein is the United States.
code of federal regulations, Food and Drugs Admini
It is measured by the method specified in §175.1520 of stration. It is preferable to use the ethylene / α-olefin copolymer (A) in which the weight ratio a of the cold xylene-soluble portion satisfies the above range, and the resin composition of the present invention gives an excellent effect on stretchability.

Further, as the ethylene / α-olefin copolymer (A), those in which the proportion of components eluted at an elution temperature of 88 ° C. or higher in the composition distribution curve is 10% by weight or less are preferably used. When the content of this component is 5% by weight or less, the temperature range in which stretching is possible is widened, and it is more preferable.

The ethylene / α-olefin copolymer (A) satisfying these more preferable conditions is produced by a catalyst using a transition metal compound. In particular, a transition metal compound having a group having a cyclopentadiene-type anion skeleton is prepared. Those produced in the presence of the catalyst used are preferred. The transition metal compound is a so-called metallocene compounds, usually, the general formula ML _a X _na (wherein, M is a transition metal atom of Group 4 or Lanthanide series of the Periodic Table of Elements .L is cyclopentadiene A group having an anion skeleton or a group containing a hetero atom, at least one of which is a group having a cyclopentadiene-type anion skeleton.
A plurality of Ls may be cross-linked to each other. X is a halogen atom, hydrogen or a hydrocarbon group having 1 to 20 carbon atoms. n represents the valence of the transition metal atom, and a is an integer satisfying 0 <a ≦ n. ) And can be used alone or in combination of two or more. Further, the catalyst may include an organoaluminum compound including an alumoxane compound, and / or an ionic compound such as trityl borate and anilinium borate, and / or a metallocene compound.
It is used in combination with a particulate carrier including an inorganic carrier such as O ₂ and Al ₂ O _{3 and} an organic polymer carrier such as an olefin polymer such as ethylene and styrene.

Ethylene α-olefin used in the present invention
Copolymer (B) is also ethylene-α-olefin copolymer
Ethylene and at least one kind of carbon having 3 to 1 as in the body (A)
2 is a copolymer with α-olefin,
The same α-olefin as the olefin copolymer (A)
No. The content of α-olefin is usually 20 mol.
% Or less. The ethylene / α-olefin copolymer
The density of (B) is 0.915 g / cm^Three0.940 or more
g / cm^ThreeOr less, preferably 0.915 g / cm^Threethat's all
0.935g / cm^ThreeOr less, more preferably 0.91
8g / cm^Three0.925 g / cm or more ^ThreeIs less than and
Its melt flow rate (MFR) is 0.1-50 g /
10 minutes, preferably 0.5 to 10 g / 10 minutes, more preferably
Preferably, it is 1 to 5 g / 10 minutes. The density is 0.915
g / cm^ThreeSmaller than 0.940 g / cm^Three
Even if it is larger, the target stretching temperature range is narrow
Is not preferred. Also, the value of melt flow rate
Is less than 0.1 g / 10 min, stretched film molding
Sometimes, the extrusion load becomes too high, so it is preferable
Absent. On the other hand, if this value exceeds 50 g / 10 minutes,
Decreases stretchability due to breakage of film during stretching
Cause

The ethylene / α-olefin copolymer (B) preferably further satisfies the following (b-4) and (b-5). (b-4) The weight ratio a (% by weight) of the cold xylene-soluble portion has the relationship of the following (Equation 4): a ≧ 4.8 × 10 ⁴ × (0.95-d) ³ +10 ⁶ × (0.95-d ) ⁴ +1 (Equation 4) (where a is the weight percentage of the cold xylene soluble part a (% by weight),
d is the density of the ethylene / α-olefin copolymer (g / c
m ³ ). (B-5) The proportion of components eluted at an elution temperature of 88 ° C. or more in the composition distribution curve is 20% by weight or more.

It is preferable to use an ethylene / α-olefin copolymer (B) in which the weight ratio a of the cold xylene-soluble portion satisfies the above range, and the resin composition of the present invention has an excellent effect on stretchability. give.

Further, as the ethylene / α-olefin copolymer (B), those in which the proportion of components eluted at an elution temperature of 88 ° C. or more in the composition distribution curve is 20% by weight or more are preferably used. When the content of this component is 30% by weight or more, the temperature range in which stretching can be most performed is widened and more preferable.

Ethylene / α-olefin copolymer (B)
Can be produced in the same manner as in the ethylene / α-olefin copolymer (A).

Ethylene / α-olefin copolymer (A)
Is a material that has a low melting point component by itself, but has excellent stretchability at low temperatures.However, in stretching at relatively high temperatures, the tension drops sharply during stretching, and the film is stretched by melting. Was generated. ethylene·
Since the α-olefin copolymer (B) alone has a higher melting point than the above-mentioned ethylene / α-olefin copolymer (A), it can be stretched at a high temperature. Because of the large size, the material was easily broken and the temperature range at which stretching was possible was narrow. However, by combining the ethylene / α-olefin copolymer (A) and the ethylene / α-olefin copolymer (B), the temperature range in which stretching can be performed is expanded, and the stretch moldability is remarkably stabilized. I found it to be excellent.

The ethylene / α-olefin copolymer composition of the present invention comprises an ethylene / α-olefin copolymer (A)
40 to 85% by weight, preferably 55 to 85% by weight, more preferably 55 to 70% by weight, and 60 to 15% by weight, preferably 45 to 15% by weight of the ethylene / α-olefin copolymer (B). , More preferably 45 to 30% by weight
It contains. If the content of the component (B) exceeds 60% by weight or less than 15% by weight, the desired excellent stretchability cannot be obtained.

The ethylene / α-olefin copolymer composition of the present invention has an amorphous fraction at 80 ° C. of 65% or more, preferably 65 to 80% according to the following (formula 1).
The amorphous fraction at 10 ° C. is 95% or less, preferably 80%
~ 95%. Fa (T) = Fa (20) + (ΔHTi / ΔHs) × (1−Fa (20)) (Equation 1) (wherein, Fa (T) is an amorphous fraction at T ° C., Fa (20)
Is the amorphous fraction at 20 ° C. (1−ΔHs / ΔHu), ΔHs
Is the heat of fusion of the sample, ΔHu is the heat of fusion of the equilibrium crystal (29
2.9 J / g), and ΔHTi represents the accumulated heat of fusion at Ti ° C. Those satisfying this condition can be stretched at a wide range of temperatures from low to high, and a stretched film material having excellent stretch moldability can be obtained. Those which do not satisfy this condition are not preferred because the film breaks at the time of stretching and stable stretching cannot be performed.

The term "amorphous fraction" as used herein indicates a proportion of an amorphous portion at a predetermined temperature, and is described in the literature (FCS).
tehling and p. Meka, J .; App
l. Polym. Sci. , 51, 105 (199
4)). Also, the amorphous fraction Fa (T)
Measured the heat of fusion and the cumulative heat of fusion of the sample at 20 to 140 ° C. using a differential scanning calorimeter (DSC), the obtained heat of fusion ΔHs, the cumulative heat of heat ΔHTi,
It was calculated from equation (1). The differential scanning calorimeter (DS
The measurement of (C) was performed by Seiko Denshi Kogyo KK (RDC-22).
0) and a thickness of 0.2 produced by a T-die molding machine.
Approximately 10 mg of a test piece cut out from
Place in a sample pan for measurement, and add
The temperature was raised to 0 ° C. to obtain a thermograph.

The method for obtaining the resin composition is not particularly limited, and may be any known method such as an extrusion melt blending method and a Banbury blending method.

The ethylene / α-olefin copolymer composition may contain, for example, an antistatic agent, an antiblocking agent, a lubricant, an antifogging agent, a stabilizer, a nucleating agent and the like within a range not to impair the object of the present invention. An additive may be contained.

The raw material of the stretched film in the present invention can be produced by forming a film by a usual method such as an inflation method, a T-die method, and a press method.

In the present invention, stretching of the film can be uniaxial or biaxial. In the case of uniaxial stretching, for example, a commonly used roll stretching method is preferable. In the case of biaxial stretching, for example, a sequential biaxial stretching method in which stretching is performed in the MD direction after stretching in the MD direction, or a method of performing simultaneous biaxial stretching such as tubular stretching may be used. The stretching ratio at the time of stretching is, for example, 2 to 30 times, preferably 3 to 25 times, in terms of area ratio.

[0032]

Hereinafter, the present invention will be described based on examples.
The present invention is not limited to these examples. The evaluation in Examples and Comparative Examples was performed according to the following method.

(1) Stretchability The raw sheet extruded from the T-die was stretched three times vertically and horizontally by a table-top biaxial stretching machine by increasing the stretching temperature from 65 ° C. to 5 ° C. at a time. The stretchability at that time was evaluated as shown below. ：: Uniform stretching is possible. ×: Stretch break or melting occurs.

Example 1 Ethylene / hexene-1 copolymer (A) (Sumikacene E, manufactured by Sumitomo Chemical Co., Ltd., MFR = 4.1 g / 10 minutes,
Density = 0.902 g / cm ³ , Cx = 0.42, cold xylene soluble part a = 6.7% by weight (a =
11.6% by weight), elution temperature 88 in the composition distribution curve
55% by weight of a component eluted at a temperature of at least ℃ = 2.8% by weight) and ethylene / butene-1 copolymer (B) (Sumikasen L FS150A, manufactured by Sumitomo Chemical Co., Ltd., MFR =
1.03 g / 10 min, density = 0.921 g / cm ³ , cold xylene soluble part a = 6.5% by weight (a = 2.9% by weight obtained from equation 4), elution temperature 8 in composition distribution curve
(Ratio of component eluted at 8 ° C. or higher = 37.4% by weight) 45
A resin composition containing 80% by weight and having an amorphous fraction at 80 ° C. and 110 ° C. of 70.4% and 84.4%, respectively, was used. The above resin composition was extruded from a T-die at 230 ° C. and wound around a cooling drum at 20 ° C. to produce an unstretched sheet. After heating this sheet to a predetermined stretching temperature with a tabletop biaxial stretching machine, it is tripled in the machine direction and 3 times in the transverse direction.
The film was stretched simultaneously and biaxially stretched to obtain a film having a thickness of 22 μm. Table 1 shows the evaluation results.

Example 2 75% by weight of the same ethylene / hexene-1 copolymer (A) used in Example 1 and the same ethylene / butene-1 copolymer (B) used in Example 1 ) At 25% by weight
A resin composition containing and having an amorphous fraction at 80 ° C. and 110 ° C. of 73.0% and 84.8%, respectively, was stretch-formed in the same manner as in Example 1 to produce a simultaneously biaxially stretched film. Table 1 shows the evaluation results.

Comparative Example 1 The same ethylene / hexene-1 copolymer (A) as used in Example 1 was 90% by weight and the same ethylene / butene-1 copolymer (B) used in Example 1 was used. ) At 10% by weight
A resin composition containing and having amorphous fractions at 80 ° C. and 110 ° C. of 75.6% and 90.5%, respectively, was stretch-formed in the same manner as in Example 1 to produce a simultaneously biaxially stretched film. Table 1 shows the evaluation results.

Comparative Example 2 The amorphous fraction at 80 ° C. and 110 ° C. was 7
The same ethylene-hexene-1 copolymer (A) alone as used in Example 1, which is 7.8% and 92.6%, is stretch-formed in the same manner as in Example 1 to produce a simultaneously biaxially stretched film. did. Table 1 shows the evaluation results.

Comparative Example 3 Ethylene / hexene-1 copolymer (C) (Sumikacene α FZ201-0, manufactured by Sumitomo Chemical Co., Ltd., MFR = 2)
g / 10 min, density = 0.912 g / cm ³ , Cx = 0.
57, cold xylene-soluble portion a = 8.3% by weight (a = 5.7% by weight obtained from equation 3), ratio of components eluted at an elution temperature of 88 ° C. or higher in the composition distribution curve = 13.1% by weight , 80 ° C. and 110 ° C., the amorphous fractions were 73.4% and 87.8%, respectively), except that a simple substance was used, and a simultaneous biaxially stretched film was produced. Table 1 shows the evaluation results.

[0039]

[Table 1] ----------------------------------------- Stretching temperature 65 70 75 80 85 90 95 100 105 110 115 120 125 130 (° C) −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− Example 1 × × ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ × Example 2 × ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ × × × Comparative Example 1 × × ○ ○ ○ ○ ○ ○ ○ × × × × × Comparative Example 2 × × × × ○ ○ ○ ○ × × × × × × Comparative Example 3 × × × ○ ○ ○ ○ ○ ○ ○ ○ × × × −−−−−−−−−−−−−−−−−−−− −−−−−−−−−−−−−−−−−−−−

[0040]

As described above in detail, according to the present invention, an ethylene / α-olefin copolymer composition and a ethylene / α-olefin copolymer composition for a stretched film having a wide temperature range capable of stretching are provided. Can be provided. Further, the present invention can provide a film and a stretched film comprising the resin composition having a wide temperature range in which stretching is possible.

Continued on the front page (72) Inventor Kenzo Konari 5-1, Anesaki Beach, Ichihara-shi, Chiba F-term (reference) in Sumitomo Chemical Co., Ltd. 4F071 AA15 AA20X AA21X AA88 AA89 AF00Y AF05Y AF11Y AF43Y AH04 BC01 4F210 AA04E AE01 AG01 AH81 QC07 QG01 QG18 4J002 BB05W BB05X

Claims (6)

[Claims] 1. An ethylene / α-olefin copolymer (A) component having the following properties (a-1) to (a-3): 40 to 85% by weight, and the following (b-1) to (b-1): b-3) ethylene / α
-An ethylene / α-olefin copolymer composition containing 60 to 15% by weight of an olefin copolymer (B) component, and having an amorphous fraction at 80 ° C of 65% or more according to the following (Formula 1). And the amorphous fraction at 110 ° C. is 95
% Of ethylene / α-olefin copolymer composition. Component (A): (a-1) carbon number of α-olefin: 3 to 12 (a-2) melt flow rate (MFR): 0.1 to 50 g
/ 10 min (a-3) Density (d): 0.880 g / cm ³ or more and 0.91
Less than 5 g / cm ³ Component (B): (b-1) Carbon number of α-olefin: 3 to 12 (b-2) Melt flow rate (MFR): 0.1 to 50 g
/ 10 min (b-3) Density (d): 0.915 g / cm ³ or more and 0.94
0 g / cm ³ or less Fa (T) = Fa (20) + (ΔHTi / ΔHs) × (1-Fa (20)) (Equation 1) (wherein, Fa (T) is an amorphous fraction at T ° C., Fa (20)
Is the amorphous fraction at 20 ° C. (1−ΔHs / ΔHu), ΔHs
Is the heat of fusion of the sample, ΔHu is the heat of fusion of the equilibrium crystal (29
2.9 J / g), and ΔHTi represents the accumulated heat of fusion at Ti ° C. ) 2. An ethylene / α-olefin copolymer (A)
The ethylene / α-olefin copolymer composition according to claim 1, wherein the component further has the following properties (a-4) to (a-6). (a-4) Composition distribution variation coefficient C obtained from the following (Equation 2)
x is 0.5 or less Cx = σ / SCBave. (Equation 2) (where σ is the standard deviation of the composition distribution, SCBave. is 100)
The average value of the short chain branch per 0C (1 / 1000C) is shown. (A-5) The weight ratio a (% by weight) of the cold xylene-soluble portion has the relationship of the following (Equation 3): a <4.8 × 10 ⁴ × (0.95-d) ³ +10 ⁶ × (0.95- d) ⁴ +1 (Equation 3) (where a is the weight percentage of the cold xylene-soluble part a (% by weight),
d is the density of the ethylene / α-olefin copolymer (g / c
m ³ ). (A-6) The proportion of components eluted at an elution temperature of 88 ° C or higher in the composition distribution curve is 10% by weight or less. 3. An ethylene / α-olefin copolymer (B)
The ethylene / α-olefin copolymer composition according to claim 1, wherein the component further has the following properties (b-4) and (b-5). (b-4) The weight ratio a (% by weight) of the cold xylene-soluble portion has the relationship of the following (Equation 4): a ≧ 4.8 × 10 ⁴ × (0.95-d) ³ +10 ⁶ × (0.95-d ) ⁴ +1 (Equation 4) (where a is the weight percentage of the cold xylene soluble part a (% by weight),
d is the density of the ethylene / α-olefin copolymer (g / c
m ³ ). (B-5) The proportion of components eluted at an elution temperature of 88 ° C or higher in the composition distribution curve is 20% by weight or more. 4. An ethylene / α-olefin copolymer composition for a stretched film, comprising the ethylene / α-olefin copolymer composition according to any one of claims 1 to 3. 5. A film comprising the ethylene / α-olefin copolymer composition according to claim 1. 6. Ethylene for a stretched film according to claim 4.
A stretched film comprising an α-olefin copolymer composition.