JPH0848827A - Ethylene-based resin composition with improved transparency - Google Patents

Abstract

PURPOSE:To obtain an ethylene-based resin composition capable of giving good blown films. CONSTITUTION:This ethylene-based composition comprises (A) 99.9-80wt.% of a specified ethylene polymer [MFR (190 deg.C): 0.2-8g/10min; density: 0.890-0.950(g/cm<3>)] and (B) 0.1-20wt.% of a specified propylene block copolymer [MFR (230 deg.C): 0.2-10g/10min] prepared by a specific two-step polymerization process and satisfying the relationship, 6.5<=(100-beta)alpha/100+-(100-alpha)gamma/100<=75 [alphais the proportion of the former pol,ymer in the component B; beta is the proportion of the propylene in the former polymer; and gamma is the proportion of the ethylene in the latter polymer (wt.%)].

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION

FIELD OF THE INVENTION The present invention relates to an ethylene resin composition. More specifically, the present invention provides a resin composition in which a specific ethylene-α-olefin copolymer and a specific propylene block copolymer are blended in a specific ratio, particularly a resin composition useful for an inflation film. Is related to.

Inflation molding of the composition of the present invention makes it possible to obtain a film having excellent transparency, gloss, elasticity and heat resistance.

[0003]

2. Description of the Related Art Conventionally, a film obtained by inflation-molding a copolymer of ethylene and α-olefin has excellent mechanical properties such as tensile strength and impact strength. Used in large quantities for purposes. However, a film obtained by inflation-molding only a copolymer of ethylene and α-olefin has a problem that transparency is not sufficient in many applications.

On the other hand, a composition in which a polypropylene resin and an inorganic filler are mixed in an ethylene-α-olefin copolymer is proposed in JP-B-4-63097.

However, the inventors of the present invention are aware that the above technique does not improve the transparency when an ethylene-α-olefin copolymer is formed into a film, and secures sufficient antiblocking property. On the other hand, it was intended to suppress the deterioration of transparency, and the film itself derived from the composition had a deterioration in transparency itself as compared with the film formed from the original ethylene-α-olefin copolymer.

Therefore, in order to improve this problem, a method of mixing an ethylene homopolymer produced by a high pressure method with a copolymer of ethylene and α-olefin and molding the same is widely used.

[0007]

However, in the above method, in order to obtain sufficient transparency, 10% by weight or more of the ethylene homopolymer produced by the high pressure method must be mixed, and as a result, In some cases, problems such as reduction in tensile strength and heat resistance may occur.

Therefore, development of a technique for improving transparency without impairing the excellent mechanical properties of the copolymer of ethylene and α-olefin has been awaited. [Outline of Invention]

[0009]

[Means for Solving the Problems]

<Summary> The present invention has been made as a result of various studies in order to solve the above problems.

That is, the ethylene resin composition according to the present invention is characterized by containing 99.9 to 80% by weight of the following component (A) and 0.1 to 20% by weight of the following component (B). Is.

Component (A) A copolymer of ethylene and an α-olefin having 3 to 12 carbon atoms, which is produced by using a transition metal-containing catalyst,
MFR measured at 0 ° C. is 0.2-8 g / 10 minutes,
Ethylene polymer having a density of 0.890 to 0.950 g / cm ³ , Component (B) In the presence of a stereoregular polymerization catalyst, a crystalline homopolymer of propylene in the preceding stage, or propylene and ethylene and / or carbon A propylene block copolymer obtained by producing a copolymer with an α-olefin of formula 4 to 12 and producing an ethylene homopolymer or an ethylene-propylene copolymer in the latter stage, The proportion of the polymer (B) obtained in the above with respect to the whole is α% by weight,
When the proportion of propylene in the propylene polymer produced by the first-stage polymerization is β wt% and the proportion of ethylene in the ethylene polymer produced by the second-stage polymerization is γ wt%,
A propylene block copolymer that satisfies the following formula 1 and has an MFR measured at 230 ° C. of 0.2 to 10 g / 10 minutes.

6.5 ≦ (100−β) α / 100 + (100−α) γ / 100 ≦ 75 Formula 1 <Effect> The ethylene-based resin composition according to the present invention, when inflation-molded, The film can have excellent transparency, gloss, elasticity and heat resistance. DETAILED DESCRIPTION OF THE INVENTION <Component (A)> The component (A) is a copolymer of ethylene and an α-olefin having 3 to 12 carbon atoms, which is produced using a transition metal-containing catalyst, and is 190 The MFR measured at 0 ° C is 0.2 to 8 g / 10 minutes, and the density is 0.890 to 0.
It is an ethylene polymer having 950 g / cm ³ .

As the transition metal-containing catalyst, any catalyst purposeful in the present invention can be used. Specifically, for example, known Ziegler catalysts, among them, magnesium,
A catalyst composed of a solid component containing titanium and halogen or a metallocene compound component and a cocatalyst component is preferable.

The α-olefin has 3 to 12 carbon atoms, preferably 4 to 10 carbon atoms, and specifically, for example, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-butene.
1-butene, 1-hexene or 1-octene, particularly 1-butene or 1-hexene, can be used.

Ethylene in component (A) and carbon number 3-12
The ratio of α-olefin to ethylene is α: α
-Olefin is usually 70:30 to 99.3: 0.7, preferably 80:20 to 98.5: 1.5. In addition, the component (A) of the present invention satisfies predetermined requirements regarding MFR and density. Therefore, the selection of ethylene or the above α-olefins and their specific blending proportions are selected so that the requirements regarding MFR and density for component (A) are met.

The MFR of the component (A) at 190 ° C. (2.16 kg load) is 0.2 to 8 g / 10 minutes, preferably 0.5 to 4 g / 10 minutes. MFR is 0.2g / 1
If it is less than 0 minutes, the extrusion load at the time of molding becomes high and the workability deteriorates, which is not preferable. On the other hand, when it exceeds 8 g / 10 minutes, not only the strength and transparency of the film are deteriorated, but also bubbles become unstable during molding, which makes it difficult to mold, or even if molding is possible, the productivity is greatly reduced. Therefore, it is not preferable.

The density of the component (A) is 0.890 to 0.9.
50 g / cm ³ , preferably 0.905 to 0.940 g
/ Cm ^3, it is. When the density is less than 0.890 g / cm ³ , the transparency of the film is originally good, so that even if the component (B) is mixed, a remarkable effect of improving transparency is not recognized. In addition, the mechanical properties of the film, for example, the waist that affects the processability are not sufficient. On the other hand, the density is 0.950 g / cm ³
Beyond, the transparency of the original film is quite low,
Although the transparency improving effect by mixing the component (B) is recognized, the level of absolute transparency is insufficient. <Component (B)> As the component (B) used in the present invention, a specific pre-stage and post-stage are used in the presence of a stereoregular polymerization catalyst.
It is a propylene block copolymer produced by stepwise polymerization and satisfying a specific relational expression.

The "stereoregular polymerization catalyst" referred to in the present invention is
It means a catalyst which gives a propylene homopolymer having an isotactic index (boiling n-heptane insoluble content) of 90% by weight or more. Such catalysts are well known, and various types are known, including so-called "highly active catalysts" that use Mg compounds or the like as a carrier (for example, JP-A-61-78803 and 61-252218, 62-111705, 62-11706, 62-72
702, 62-187706 and 62-18770.
7, same 63-41509, same 63-83105, same 63
-89513, 63-92615, JP-A-1-318.
46, etc.).

As the stereoregular polymerization catalyst, a known combination of a titanium-containing solid catalyst component and an organoaluminum compound can be used. As the titanium-containing solid catalyst component, any purposeful one can be used, and examples thereof include a titanium trichloride composition catalyst component and a magnesium compound carrier type catalyst component.

The pre-polymerization step for forming component (B) is
A homopolymer of propylene or a copolymer of propylene and a small amount (usually 7% by weight or less, preferably 5% by weight or less) of ethylene and / or an α-olefin having 4 to 12 carbon atoms, preferably propylene and ethylene. A copolymer of. Here, in addition to ethylene, 1-butene, 1-hexene, 1-octene and the like are preferable α-olefins used for the copolymerization. Note that α-
It goes without saying that two or more olefins can be used.

The homopolymer of propylene and the copolymer of propylene and α-olefin obtained in this first-stage polymerization step are crystalline polymers.

In the second-stage polymerization step, ethylene is homopolymerized or ethylene and propylene are copolymerized in the presence of the polymerization product in the first-stage polymerization step.
An ethylene polymer is produced. A stereoregular polymerization catalyst remains in the polymerization product in the above-mentioned polymerization step, or the catalyst or one component thereof is newly added if necessary.

Further, this component (B) is, as described above,
The proportion of the polymer (B) obtained in the first stage relative to the entire component (B) is α% by weight, and the proportion of propylene in the propylene polymer produced by the first stage polymerization is β% by weight (β = 100 when the first stage is propylene homopolymerization). When the proportion of ethylene in the ethylene polymer produced by the latter-stage polymerization is γ wt% (γ = 100 when the latter-stage ethylene homopolymerization), the following formula 1 is satisfied. is there.

6.5 ≦ (100−β) α / 100 + (100−α) γ / 100 ≦ 75 ...... In order to obtain a higher transparency improving effect than the formula 1, this component (B)
Is 7.5 ≦ (100−β) α / 100 + (100−α) γ
It is desirable to satisfy / 100 ≦ 60. (100-β) α / 100 +
When the value of (100-α) γ / 100 is less than 6.5, the transparency improving effect is insufficient. On the other hand, when it exceeds 75, the effect of improving the rigidity and heat resistance of the film is insufficient. The component (B) having the above value of 7.5 or more and 60 or less is particularly preferable.

The MFR at 230 ° C. (2.16 kg load) of the block copolymer obtained through the above-mentioned first-stage and second-stage polymerization steps is 0.2 to 10 g / 10 minutes, preferably 0.5.
~ 7g / 10 minutes. When the MFR is less than 0.2 g / 10 minutes, the effect of improving transparency is insufficient, which is not preferable. on the other hand,
Even when the MFR exceeds 10 g / 10 minutes, a sufficient transparency improving effect cannot be obtained.

The component (B) can be produced either continuously or batchwise by slurry polymerization using a known inert solvent such as hexane or heptane, bulk polymerization carried out in a liquid phase monomer, or gas phase monomer. Any method such as gas phase polymerization can be adopted. The polymerization temperature is usually 40 to 100 ° C,
The temperature is preferably 50 to 90 ° C., and the polymerization pressure is atmospheric pressure to 5
It is in the range of 0 atm. In addition, a post-treatment step of removing the catalyst residue from the block copolymer may be added if necessary. <Resin composition of the present invention> In the ethylene resin composition according to the present invention, the mixing ratio of the component (A) and the component (B) is 99.9 by weight: component (A): component (B). 0.1-
80:20, preferably 99.5: 0.5 to 85: 1.
5. When the blending ratio of the component (B) is less than 0.1% by weight, sufficient transparency improving effect cannot be obtained. Also, 20
Even when it exceeds the weight%, sufficient transparency improving effect cannot be obtained, which is not preferable.

In the composition of the present invention, additional components such as a heat stabilizer, an antioxidant, a neutralizing agent, an ultraviolet absorber, an antiblocking agent, a lubricant, and an antistatic agent are added to the extent that the effects of the present invention are not significantly impaired. Inhibitors, nucleating agents, anti-condensation agents, molecular weight modifiers (organic peroxides, azo compounds, etc.), colorants, impact modifiers, fillers, flame retardants, adhesion improvers and printability improvers be able to.

As a method for producing an inflation film using the composition of the present invention, a known method can be adopted.
For example, pelletized component (A) and component (B)
Alternatively, the composition containing them and the above-mentioned additional components as they are, preferably after pelletization using a known single-screw or twin-screw extruder or kneader, and then molded using a known inflation molding machine to form a film. obtain. Particularly preferably, the powdery component (A) and the component (B), or a composition containing them and the above-mentioned additional components is mixed using a known mixer such as a super mixer, and then a known uniaxial or biaxial A film can be obtained by pelletizing using an extruder or a kneader and then molding using a known inflation molding machine.

The thus-obtained ethylene resin film according to the present invention has the following haze, glossiness, tensile modulus and tensile strength at break and has transparency, gloss and mechanical properties. It is excellent. (1) Haze (according to JIS K7105) 0.5 to 10%, (2) Glossiness (according to JIS K7105) 50 to 190%, (3) Tensile elastic modulus (according to ISO R1184, longitudinal measurement value) ) 500 to 6000 kg / cm ² , (4) Tensile strength at break (based on JIS K7127 tensile test, longitudinal measurement value) 250 to 1000 kg / cm ² (However, each of the above values is at a temperature of 200 ° C. and blown. Width 23 formed under conditions of up ratio 2.0 and take-up speed 15 m / min
0 mm, 30 μm thick blown film)

[0030]

EXAMPLES The measuring methods and measuring conditions used in the following examples and comparative examples are as follows. (1) According to MFR JIS K6760, component (A) is 190 ° C
The component (B) was measured at a temperature of 230 ° C. under a load of 2.16 kg. (2) Density The density was measured according to JIS K6760. (3) Haze It was measured according to JIS K7105. (4) Glossiness Measured according to JIS K7105. (5) Tensile Modulus In accordance with ISO R1184, measured values in the longitudinal direction are shown. (6) Tensile strength at break The measured values in the longitudinal direction are shown based on the tensile test of JIS K7127. (7) Melting point The melting end temperature in the DSC measurement was taken as the melting point. DSC
The measurement was carried out by increasing the temperature of 5 mg of the pressed sheet sample from 23 ° C. to 170 ° C. at a heating rate of 100 ° C./minute,
Hold at 170 ° C for 5 minutes, then cool down at 10 ° C / min -1
After lowering the temperature to 0 ° C., the temperature was kept at −10 ° C. for 1 minute, and then the temperature was raised to 170 ° C. at a temperature rising rate of 10 ° C./min.

<Example 1> As the component (A), the MFR at 190 ° C produced using a Ziegler catalyst was 1.0 g.
/ 10 minutes, 95% by weight of powdery ethylene-butene-1 copolymer having a density of 0.920 g / cm ³ , using a catalyst composed of diethylaluminum chloride and titanium trichloride as component (B) In the former stage, 84% by weight (α = 16) of propylene homocopolymer (β = 100) was produced, and in the latter stage, 16% by weight of ethylene homocopolymer (γ = 100) was produced. MFR is 0.9
5% by weight of powdery propylene block copolymer in an amount of 10 g / min, and n-octadecyl-β- (4'hydroxy-3 ', 5'-ditertiarybutyl-phenol) propionate as an antioxidant in an amount of 0.5% by weight. 05 parts by weight and tetrakis (2,4-di-tertiarybutylphenyl)
0.05% of 4,4'-biphenylene diphosphonate
Parts by weight, and 0.05 parts by weight of calcium stearate as a neutralizing agent were used, and these were mixed for 5 minutes at a rotation speed of 800 rpm / min using a super mixer having a capacity of 50 liters, and then screw diameter 40 mmφ, L / D2
It melt-kneaded with the extruder of 6 at 200 degreeC, and was pelletized. This pellet is screw diameter 40mmφ, L / D2
Die diameter 75mmφ equipped with 4 extruder, die gap 3
mm inflation machine, temperature 200
C., blow-up ratio of 2.0, and take-up speed of 15 m / min were molded to obtain an inflation film having a width of 230 mm and a thickness of 30 .mu.m. The haze, gloss, tensile modulus, tensile strength at break and melting point of this film were measured. The results are as shown in Table 1.

<Examples 2 to 5> 95% by weight of the same component (A) as in Example 1 and (A) the propylene homopolymer (β = 100) in the preceding stage in Example 2 as the component (B). 9
2% by weight (α = 92) was produced, and 8% by weight of ethylene homocopolymer (γ = 100) was produced in the latter stage, which was obtained at 230 ° C.
The pelletized propylene block copolymer having an MFR of 2.7 g / 10 min was used in (b) Example 3 in the preceding stage to obtain a propylene-ethylene copolymer having an ethylene content of 2.5% by weight (β = 97.5). 94% by weight (α = 94) of the coalescence is produced,
A pelletized propylene block copolymer obtained by producing 6% by weight of an ethylene homopolymer (γ = 100) in the latter stage and having an MFR of 230 ° C. of 3.0 g / 10 min,
In Example 4, the propylene homopolymer (β = 10) was used in the first stage.
0) was produced in an amount of 85% by weight (α = 85), and 15% by weight of an ethylene-propylene copolymer having an ethylene content of 80% by weight (γ = 80) was produced in the subsequent stage, and the MFR at 230 ° C. was 6. A pelletized propylene block copolymer of 5 g / 10 minutes was prepared. (D) In Example 5, 73% by weight (α = 73) of propylene homopolymer (β = 100) was produced in the first stage, and ethylene content was produced in the second stage. 60% by weight (γ = 60) of ethylene-propylene copolymer was obtained by producing 27% by weight,
5% by weight of pelletized propylene block copolymer having a MFR of 230 ° C. of 1.2 g / 10 min was added, and the same antioxidant and neutralizing agent as in Example 1 were added to Example 1 respectively. Pelletization, film forming and film quality measurement were carried out in the same manner as in Example 1 for the same amount of the above compounded. The results are as shown in Table 1.

<Example 6> As the component (A), 95% by weight of commercially available "Moretech 0138H" manufactured by Idemitsu Petrochemical Co., Ltd.
The same component (B) as in Example 5 was blended in an amount of 5% by weight, and pelletization, film forming and film quality measurement were performed in the same manner as in Example 1. The results are as shown in Table 1.

<Example 7> The same component (A) as in Example 1
Example 1 was prepared by blending 90% by weight of the same component (B) as in Example 1 with 10% by weight, and the same antioxidant and neutralizing agent as in Example 1 in the same amounts as in Example 1. Pelletization, film forming and film quality measurements were performed as in. The results are as shown in Table 1.

<Example 8> The same component (A) as in Example 1
To 99% by weight, 1% by weight of the same component (B) as in Example 1 was added.
Then, the same antioxidant and neutralizing agent as in Example 1 were mixed in the same amounts as in Example 1, and pelletization, film forming and film quality measurement were performed in the same manner as in Example 1. The results are as shown in Table 1.

<Example 9> The same component (A) as in Example 1
To 99.5% by weight, the same component (B) as in Example 1 was added.
Pelletization, film forming and film quality measurement were carried out in the same manner as in Example 1 using 5% by weight and the same antioxidant and neutralizing agent as in Example 1 in the same amounts as in Example 1. The results are as shown in Table 1.

<Example 10> As the component (A), 190
℃ MFR 0.5g / 10min, density 0.920g /
cm ³ of powdery ethylene-butene-1 copolymer was used in an amount of 95% by weight, and the same component (B) as in Example 1 was added in an amount of 5% by weight. Example 1 was prepared by blending the same amount of the respective disinfectants as in Example 1, pelletizing the mixture in the same manner as in Example 1, and then forming a film under the same conditions as in Example 1 except that the temperature was set to 220 ° C. The film quality was measured in the same manner. The results are as shown in Table 1.

<Example 11> As the component (A), 190
℃ MFR 1.6g / 10min, density 0.916g /
cm ³ of powdery ethylene-butene-1 copolymer was used in an amount of 95% by weight, and the same component (B) as in Example 1 was added in an amount of 5% by weight. Example 1 was prepared by blending the same amount of the respective disinfectants as in Example 1, pelletizing the mixture in the same manner as in Example 1, and then forming a film under the same conditions as in Example 1 except that the temperature was 190 ° C. The film quality was measured in the same manner. The results are as shown in Table 1.

<Example 12> As the component (A), 190
℃ MFR 2.4g / 10min, density 0.921g /
cm ³ of powdery ethylene-butene-1 copolymer was used in an amount of 95% by weight, and the same component (B) as in Example 1 was added in an amount of 5% by weight. Example 1 was prepared by blending the same amount of the respective disinfectants as in Example 1, pelletizing the mixture in the same manner as in Example 1, and then forming a film under the same conditions as in Example 1 except that the temperature was 190 ° C. The film quality was measured in the same manner. The results are as shown in Table 1.

<Example 13> As the component (A), 190
℃ MFR 1.9g / 10min, density 0.922g /
A powdery ethylene-hexene-1 copolymer having a size of ³ cm ³ was used in an amount of 95% by weight, and the same component (B) as in Example 1 was added to this in an amount of 5% by weight. Example 1 was prepared by blending the same amount of the respective disinfectants as in Example 1, pelletizing the mixture in the same manner as in Example 1, and then forming a film under the same conditions as in Example 1 except that the temperature was 190 ° C. The film quality was measured in the same manner. The results are as shown in Table 1.

<Example 14> As the component (A), 190
℃ MFR 2.4g / 10min, density 0.931g /
A powdery ethylene-hexene-1 copolymer having a size of ³ cm ³ was used in an amount of 95% by weight, and the same component (B) as in Example 1 was added to this in an amount of 5% by weight. Example 1 was prepared by blending the same amount of the respective disinfectants as in Example 1, pelletizing the mixture in the same manner as in Example 1, and then forming a film under the same conditions as in Example 1 except that the temperature was 190 ° C. The film quality was measured in the same manner. The results are as shown in Table 1.

<Example 15> 95% by weight of the same component (A) as in Example 1 and 5% of the same component (B) as in Example 1 were used.
The same antioxidant and neutralizing agent as in Example 1 were added in the same amounts as in Example 1, and 0.17 parts by weight of erucinamide as a lubricant and an average particle size as an antiblocking agent were added. Example 1 was prepared by adding 0.2 part by weight of hydrous magnesium silicate of about 2.5 μm.
Pelletization, film forming and film quality measurements were performed as in. The results are as shown in Table 1.

<Comparative Example 1> The same component (A) as in Example 1
The same antioxidant and neutralizing agent as in Example 1 were mixed in the same amounts as in Example 1, and pelletization, film forming and film quality measurement were performed in the same manner as in Example 1. The results are as shown in Table 1.

<Comparative Examples 2 to 5> 95% by weight of the same component (A) as in Example 1 was used as the component (B). In (a) Comparative Example 2, the MFR at 230 ° C. was 0.9 g / 10 min. In Comparative Example 3, the pelletized propylene homopolymer was produced in the first stage by producing 94% by weight (α = 94) of propylene homopolymer (β = 100), and in the second stage, ethylene homopolymer (γ).
= 100) produced by 6% by weight, MFR at 230 ° C.
Of 0.4 g / 10 min in the form of pelletized propylene block copolymer, and (c) in Comparative Example 4, 92% by weight (α = 92) of a propylene homopolymer (β = 100) was produced in the first stage, and the second stage was produced. Was obtained by producing 8% by weight of an ethylene-propylene copolymer having an ethylene content of 70% by weight (γ = 70).
A pelletized propylene block copolymer having an MFR of 230 ° C. of 2.2 g / 10 minutes, and (d) a pelletized propylene homopolymer having a MFR of 230 ° C. of 22 g / 10 minutes in Comparative Example 5, 5 wt% of each was mixed, and the same antioxidant and neutralizing agent as in Example 1 were mixed in the same amounts as in Example 1, respectively, pelletizing, film forming and film quality measurement as in Example 1. I went. The results are as shown in Table 1.

<Comparative Example 6> The same components (A) as in Example 10 and the same antioxidant and neutralizing agent as in Example 1 were mixed in the same amounts as in Example 1, respectively. Similarly, pelletization, film forming and film quality measurement were performed. The results are as shown in Table 1.

<Comparative Example 7> The same components (A) as in Example 11 were mixed with the same antioxidants and neutralizing agents as in Example 1 in the same amounts as in Example 1, respectively. Similarly, pelletization, film forming and film quality measurement were performed. The results are as shown in Table 1.

<Comparative Example 8> The same components (A) as in Example 12 were mixed with the same antioxidants and neutralizing agents as in Example 1 in the same amounts as in Example 1, respectively. Similarly, pelletization, film forming and film quality measurement were performed. The results are as shown in Table 1.

<Comparative Example 9> The same component (A) as in Example 13 was mixed with the same antioxidant and neutralizing agent as in Example 1 in the same amounts as in Example 1. Similarly, pelletization, film forming and film quality measurement were performed. The results are as shown in Table 1.

Comparative Example 10 The same components (A) as in Example 14 and the same antioxidant and neutralizing agent as in Example 1 were mixed in the same amounts as in Example 1, respectively. Similarly, pelletization, film forming and film quality measurement were performed. The results are as shown in Table 1.

<Comparative Example 11> 87 wt% of the same component (A) as in Example 1 was added, and the MFR at 190 ° C. was 0.3 g / 1.
The same amount of antioxidant and neutralizing agent as in Example 1 was added to 13% by weight of pelletized high pressure polyethylene having a density of 0.927 g / cm ³ for 0 minutes. Pelletization, film forming, and film quality measurement were performed on the blended material in the same manner as in Example 1. The results are as shown in Table 1.

<Comparative Example 12> With the same component (A) as in Example 6, film molding and film quality measurement were carried out in the same manner as in Example 1. The results are as shown in Table 1.

[0052]

[Table 1]

[0053]

As described above in the section of the summary of the invention, the composition of the present invention can obtain a film excellent in transparency, gloss, elasticity and heat resistance when inflation-molded. is there.

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Claims (6)

[Claims] 1. An ethylene-based resin composition comprising 99.9 to 80% by weight of the following component (A) and 0.1 to 20% by weight of the following component (B). Component (A) A copolymer of ethylene and an α-olefin having 3 to 12 carbon atoms, which is produced using a transition metal-containing catalyst,
MFR measured at 0 ° C. is 0.2-8 g / 10 minutes,
Ethylene polymer having a density of 0.890 to 0.950 g / cm ³ , Component (B) In the presence of a stereoregular polymerization catalyst, a crystalline homopolymer of propylene in the preceding stage, or propylene and ethylene and / or carbon A propylene block copolymer obtained by producing a copolymer with an α-olefin of formula 4 to 12 and producing an ethylene homopolymer or an ethylene-propylene copolymer in the latter stage, The proportion of the polymer (B) obtained in the above with respect to the whole is α% by weight,
When the proportion of propylene in the propylene polymer produced by the first-stage polymerization is β wt% and the proportion of ethylene in the ethylene polymer produced by the second-stage polymerization is γ wt%,
A propylene block copolymer that satisfies the following formula 1 and has an MFR measured at 230 ° C. of 0.2 to 10 g / 10 minutes. 6.5 ≦ (100−β) α / 100 + (100−α) γ / 100 ≦ 75 Formula 1 2. Component (A) comprises ethylene and 4 to 10 carbon atoms.
The ethylene-based resin composition according to claim 1, which is a copolymer with the α-olefin. 3. The ethylene-based resin composition according to claim 1, wherein the component (B) is a crystalline homopolymer of propylene produced in the preceding stage. 4. The ethylene-based resin composition according to any one of claims 1 to 3, wherein the component (B) is an ethylene homopolymer produced in the latter stage. 5. An ethylene-based resin film obtained by inflation molding the ethylene-based resin composition according to any one of claims 1 to 4. 6. The ethylene-based resin film according to claim 5, which has the following haze, glossiness, tensile modulus and tensile breaking strength. (1) Haze (according to JIS K7105) 0.5 to 10%, (2) Glossiness (according to JIS K7105) 50 to 190%, (3) Tensile elastic modulus (according to ISO R1184, longitudinal measurement value) ) 500 to 6000 kg / cm ² , (4) Tensile strength at break (based on JIS K7127 tensile test, longitudinal measurement value) 250 to 1000 kg / cm ² (However, each of the above values is at a temperature of 200 ° C. and blown. Width 23 formed under conditions of up ratio 2.0 and take-up speed 15 m / min
0 mm, 30 μm thick blown film)