JPH11228758A - Stretch film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prepare a stretch film which uses a polyolefin material and shows a high adhesion property as well as transparency and impact resistance. SOLUTION: The film comprises an ethylene/α-olefin copolymer composition containing from 80 to 99.5 wt.% ethylene/α-olefin copolymer (A) component having the following characteristics (a-1)-(a-5) and from 20 to 0.5 wt.% low- density polyethylene (B) component or from 20 to 0.5 wt.% high-density polyethylene (C) component, which is obtained through high-voltage radical polymerization. Component (A): (a-1) the carbon number of the α-olefin is from 3 to 12, (a-2) the melt flow rate(MFR) is from 0.1 to 50 g/10 min, (a-3) the density (d) is from 0.880 to 0.935 g/cm<3> , (a-4) the coefficient of variation of composition distribution Cx, defined by the formula: Cx=σ/SCB ave. [σ: standard deviation of composition distribution, SCB ave.: average of short-chain branching per 1,000C (1/1,000C)], is 0.5 or smaller and (a-5) the weight ratio (a) (wt.%) of the cold xylene-soluble portion and the density (d) (g/cm<3> ) satisfy the formula: a<4.8×10<4> ×(0.95-d)<3> +10<6> ×(0.95-d)<4> +1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a stretch film. More specifically, the present invention relates to a tretch film comprising a resin composition containing a specific ethylene / α-olefin copolymer and low-density polyethylene or high-density polyethylene obtained by a high-pressure radical polymerization method.

[0002]

2. Description of the Related Art In general, stretch films are wrapped while being stretched, and are characterized by a function of protecting, accumulating and promoting the contents. Specifically, it covers a wide range such as a wrap film for home use, a shrink film for food packaging and the like, a stretch film for integrated packaging and the like. The physical properties required for the stretch film include high transparency, high impact strength, and self-adhesiveness. Known materials for these films include low-density polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, and ethylene-vinyl acetate copolymer. The low-density polyethylene film alone is not very good in transparency and tackiness, and the polypropylene film has good transparency and strong stiffness, but has a drawback of low impact strength. Polyvinyl chloride and polyvinylidene chloride are excellent in transparency and tackiness, but have poor impact strength, especially low-temperature impact strength, and there are food hygiene problems due to the plasticizer contained in the film. Is being considered. Ethylene-vinyl acetate copolymer films have excellent transparency, tackiness, and low-temperature impact strength, but have problems in food hygiene.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a stretch film using a polyolefin-based material, which is excellent in adhesiveness and excellent in transparency and impact strength.

[0004]

For many years, the present inventors have been intensively studying a material which is important as a stretch film and which has adhesiveness, transparency and excellent impact strength. As a result, it has been found that a stretch film composed of a resin composition containing a specific ethylene / α-olefin copolymer and a low-density polyethylene or a high-density polyethylene obtained by a high-pressure radical polymerization method achieves the object of the present invention. The invention has been completed.

That is, the present invention provides the following (a-1) to (a-5)
80 to 99.5% by weight of an ethylene / α-olefin copolymer (A) component having the following properties, and 20 to 0.5% of a low-density polyethylene (B) component obtained by a high-pressure radical polymerization method.
% By weight or high density polyethylene (C) component 20-0.
A stretch film comprising an ethylene / α-olefin copolymer composition containing 5% by weight. 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 to 0.935 g / cm ³ (a-4) Composition distribution variation coefficient Cx defined by the following equation (1)
Is 0.5 or less Cx = σ / SCBave. Equation (1) σ: Standard deviation of composition distribution SCBave .: Average value of short-chain branching per 1000C (1/1)
000C) (a-5) The weight ratio a (wt%) of the cold xylene-soluble portion is the density
A <4.8 × 10 ⁴ × (0.95-d) ³ +10 ⁶ × (0.95-d) ⁴ +1 which satisfies relational expression (2) with (g / cm ³ ) Expression (2) Hereinafter, the present invention will be described in detail. explain.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Ethylene / α used in the present invention
The olefin copolymer (A) component is a copolymer of ethylene and one or more (a-1) α-olefins having 3 to 12 carbon atoms. Specific examples of these copolymer components 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, but the present invention is limited to the above compounds It should not be. Among these, butene-1, hexene-1, and octene-14-methyl-pentene-1 are preferred.

The ethylene / α-olefin copolymer comprises:
(A-2) Melt flow rate (MFR) of 0.1 to 5
0g / 10 minutes, and its (a-3) density is 0.880-0.
935 g / cm ³ is satisfied.

In the present invention, the melt flow rate (MF)
R) means a load of 2.16 kg and a measurement temperature of 190 ° C. according to the method specified in JIS K6760-1981.
Is a value measured under the condition of If this value is smaller than 0.1 g / 10 minutes, the extrusion load in film forming becomes too high, which is not preferable. On the other hand, this value is 50 g
If the time exceeds / 10 minutes, the strength of the film greatly decreases, which is not preferable. The preferred range of the melt flow rate is 0.3 to 20 g / 10 min, more preferably 0.5 to 10 g.
g / 10 minutes, most preferably 0.8 to 5 g / 10 minutes.

The ethylene / α-olefin copolymer weight referred to here
The density (d) of the union is JIS K6760-1980.
It is measured by the method specified in. The density is 0.88
0 g / cm^ThreeIf it is smaller than this, the rigidity is too low
Used as a packaging film for handling
Not suitable for On the other hand, the density is 0.935 g / cm
^ThreeIf it is larger than this, transparency and impact strength will decrease.
Not preferred. The preferred density is 0.890-0.93
0 g / cm^Three, More preferably 0.895 to 0.92.
5g / cm^ThreeIt is.

The ethylene / α-olefin copolymer used in the present invention satisfies the following (a-4) and (a-5). (a-4) Composition distribution variation coefficient Cx defined by the following equation (1)
Is 0.5 or less Cx = σ / SCBave. Equation (1) σ: Standard deviation of composition distribution SCBave .: Average value of short-chain branching per 1000C (1 /
(1000C) (a-5) The weight ratio a (wt%) of the cold xylene-soluble portion is the density d.
A <4.8 × 10 ⁴ × (0.95-d) ³ +10 ⁶ × (0.95-d) ⁴ +1 Equation (2)

The composition distribution variation coefficient Cx referred to 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.
It is preferably 5 or less, which gives excellent results in balance between the transparency and the antiblocking property of the stretch film of the present invention. When the composition distribution variation coefficient Cx exceeds 0.5, the strength may be reduced and the anti-blocking property may be poor.

The outline of the measurement of the composition distribution variation coefficient Cx is as follows. The ethylene / α-olefin copolymer (A) component used in the present invention is dissolved in a solvent heated to a predetermined temperature, put into a column in a column oven, and the oven temperature is lowered. 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 determined from the obtained relative concentration and the degree of short-chain branching. The standard deviation of this composition distribution curve is σ, and the average branching degree (Σ (SCB × the ratio of the amount of elution with each SCB)) is SCBave. The composition distribution variation coefficient Cx was calculated by the above equation.

[0013] The cold xylene-soluble part mentioned here is
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 an ethylene / α-olefin copolymer in which the weight ratio a of the cold xylene-soluble portion satisfies the above range, and excellent results are obtained in the balance between transparency and mechanical strength of the resin composition used in the present invention. give. When the weight ratio a of the cold xylene-soluble portion is larger than the range shown in the above formula, the strength tends to decrease and the anti-blocking property tends to deteriorate. The more preferable range of a is the range of the formula (6), and most preferable is the range of the formula (7). a <4.8 × 10 ⁴ × (0.95−d) ³ +10 ⁶ × (0.95−d) ⁴ Equation (6) a <4.8 × 10 ⁴ × (0.95−d) ³ Equation (7) (where a is cold The weight ratio a (% by weight) of the xylene-soluble part and d represent the density (g / cm ³ ) of the ethylene / α-olefin copolymer.)

The ethylene / α-olefin copolymer satisfying these more preferable conditions is produced by a catalyst using a transition metal compound, and in particular, a catalyst comprising a transition metal compound having a group having a cyclopentadiene type anion skeleton. Those produced in the presence 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 the 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.
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 comprises the metallocene compound, an organoaluminum compound including an alumoxane compound, and / or an ionic compound such as trityl borate or anilinium borate, and / or SiO ₂ , A
It is used in combination with a particulate carrier including an inorganic carrier such as l ₂ O _{3 and} an organic polymer carrier such as an olefin polymer such as ethylene and styrene. However, the catalyst for producing the ethylene / α-olefin copolymer used in the present invention is not limited to the above compounds. The polymerization method is not particularly limited, and examples thereof include a gas phase polymerization method, a liquid phase polymerization method, and a high pressure ionic polymerization method, and a gas phase polymerization method is particularly preferable.

The low-density polyethylene (B) component obtained by the high-pressure radical polymerization method used in the present invention is generally used in a tank reactor or a tube reactor in the presence of a radical generator.
Polymerization pressure 1400-3000 kg / cm ² , polymerization temperature 2
It is carried out by polymerizing ethylene under the condition of 00 to 300 ° C. The melt flow rate can be adjusted by using a hydrocarbon such as hydrogen, methane, or ethane as a molecular weight modifier.

The low-density polyethylene (B) component obtained by the high-pressure radical polymerization method used in the present invention has (b-1) a melt flow rate (MFR) of 0.2 to 20 g / 10 minutes and a (b-2) density of (b-2). Those satisfying 0.910 to 0.935 g / cm ³ are preferable.

In the present invention, the melt flow rate is J
According to the method specified in IS K6760-1981, the load was 2.16 kg, and the measurement temperature was a value measured at 190 ° C. A more preferred melt flow rate range is 0.35 to 10 g / 10 min, most preferably 0.4 to 10 g / 10 min.
５5 g / 10 min.

The above density is defined in JIS K6760-19.
It is measured by the method specified in 81. More preferred density 0.915~0.930g / cm ^3, most preferably from 0.918~0.925g / cm ^3.

Further, the low-density polyethylene (B) component obtained by the high-pressure radical polymerization method used in the present invention comprises the (b-
3) The swell ratio (SR) is the melt flow rate (MFR)
It is important to satisfy the relational expression (3). 1.81 × 10 ⁻¹ × log (MFR) +1.58>SR> 1.29 Equation (3) Regarding the structure of low-density polyethylene by high-pressure radical polymerization, the average molecular weight, molecular weight distribution, long-chain branching degree, etc. are controlled by polymerization conditions. It is possible. The swell ratio (SR) used here is an index indicating the degree of long-chain branching, and is determined according to JIS K7210. The swell ratio (SR) of the low density polyethylene by the high pressure radical polymerization method used in the present invention is the melt flow rate
When a specific range satisfying the relational expression with (MFR) is used, the effect of the present invention can be characteristically exhibited.

The high-density polyethylene (C) component used in the present invention has (c-1) a melt flow rate of 0.2 to 20 g.
/ 10 min, (c-2) the density is 0.940 g / cm ³ or more, and (c-3) the value of [g] ^* defined by the following formula (4) is 0.2 to 0.8. Density polyethylene is preferred. [g] ^* = [η] / [η] _l Equation (4) where [η] was measured with a tetralin solution at 135 ° C.
[Η] _l is the intrinsic viscosity of the linear high-density polyethylene having the same weight average molecular weight as the component (C), and is determined by the following formula (5). [Η] _l = 4.86 × 10 ⁻⁴ [Mw] ^0.705 Formula (5) Here, [Mw] is the weight average molecular weight (GPC) of the component (C).
-By the LALLS method). The melt flow rate of the high-density polyethylene (C) component is more preferably 0.5 to 10 g / 10 minutes. The density of the high-density polyethylene is more preferably 0.945 to 0.955 g / c.
m is ^3. The value of [g] ^* of the high-density polyethylene defined by the above formula (4) is more preferably 0.3 to 0.6. The weight average molecular weight of the component (C) is GPC-LALLS (Gel
Permiation Chromatography-Low Angle Laser Light
Scattering method). Equation (5) is described, for example, in the literature (H. Rachapudy, GG Smith, V.
R. Raju, and WWGlassley, J. Polym. Sci., Polym.
Phys. Ed., 17, 1211 (1979)). The method for obtaining the high-density polyethylene (C) component includes, for example, the following method. That is, ethylene alone, or ethylene and a small amount of an α-olefin having 3 to 18 carbon atoms, using a Ziegler-Natta catalyst or a metallocene catalyst, in the presence or absence of a solvent, gas-solid, liquid- Polymerizes under a solid or homogeneous liquid layer. The polymerization temperature is usually 30 to 300 ° C
And the polymerization pressure is from normal pressure to 3000 kg / cm ² . In addition, it can be selected from those commercially available as high-density polyethylene.

The mixing ratio of each component in the ethylene / α-olefin copolymer composition used in the present invention is as follows.
-80 to 99.5% by weight, preferably 90 to 99% by weight, more preferably 95% by weight of the olefin copolymer (A) component.
-99% by weight, 20-0.5% by weight, preferably 10-1% by weight, more preferably 5-1% by weight, of the low-density polyethylene (B) component or the high-density polyethylene (C) component by a high-pressure radical polymerization method. is there. If the content of the component (B) or the component (C) exceeds 20% by weight, a satisfactory impact strength as a stretch film cannot be obtained. It is not possible to obtain a balance of low pollution.

In producing the ethylene / α-olefin copolymer composition used in the present invention, the constituent ethylene / α-olefin copolymer (A) component and the low-density polyethylene (B) component obtained by a high-pressure radical polymerization method Alternatively, the high-density polyethylene (C) component is dry-blended or melt-blended. Various blenders such as Henschel mixer and tumbler mixer are used for dry blending, and melt blending is used for melt blending.
For example, single screw extruder, twin screw extruder, Banbury mixer,
Various mixers such as a hot roll are used.

The stretch film of the present invention is preferably used as a film of the above-mentioned ethylene / α-olefin copolymer composition by using an apparatus for producing an inflation film or a T-die cast film.
In addition, the ethylene / α-olefin copolymer composition used in the present invention can be used as a multilayer film by employing techniques such as a coextrusion method and an extrusion coating method (also referred to as an extrusion lamination method). Further, using a single-layer film obtained by using these devices, cellophane, paper, paperboard, woven fabric by a known technique such as a lamination method such as a dry lamination method, a wet lamination method, a sand lamination method, and a hot melt lamination method. It can also be used as a multilayer film laminated on a base material such as aluminum foil, polyamide resin such as nylon 6 and nylon 66, polyester resin such as polyethylene terephthalate and polybutylene terephthalate, and stretched polypropylene.

The stretch film of the present invention may be selected from ethylene and α-α as long as the effects of the present invention are not impaired.
What blended various resins other than each component in an olefin copolymer composition may be used. For example, a blend of high-density polyethylene for the purpose of improving rigidity and a blend of a polyolefin-based resin such as a low-density elastomer for the purpose of improving impact strength may be used alone or in combination of two or more.

In order to further improve the physical properties of the stretch film of the present invention, if necessary, 2,6-di-t-butyl-p-cresol (BHT) and tetrakis [methylene-3]
-(3,5-di-t-butyl-4-hydroxyphenyl)
Propionate] methane (IRGANOX 1010),
n-octadecyl-3- (4'-hydroxy-3,5'-
Di-t-butylphenyl) propionate (IRGANO
Phenolic stabilizers represented by X 1076);
Phosphite stabilizers represented by (2,4-di-t-butylphenyl) pentaerythritol diphosphite and tris (2,4-di-t-butylphenyl) phosphite; higher fatty acid amides and higher fatty acid esters An antistatic agent such as a glycerin ester, a sorbitan acid ester, or a polyethylene glycol ester of a fatty acid having 8 to 22 carbon atoms; a processability improver represented by a fatty acid metal salt such as calcium stearate;
An anti-blocking agent represented by calcium carbonate, talc and the like may be contained.

The resin components such as high-density polyethylene and low-density elastomer, and additives such as antioxidants, antiblocking agents, lubricants, and processability improvers, which are blended according to various purposes as described above, are previously melted. After kneading, it may be subjected to film processing, may be individually dry blended or made into one or more master batches, and then subjected to film processing after dry blending, and any method may be used.

[0027]

Next, the present invention will be described in more detail with reference to examples and comparative examples, but the present invention is not limited to these examples.

The evaluation method is as follows. (1) Density (d) According to the method specified in JIS K6760. (2) Melt flow rate (MFR) According to the method specified in JIS K6760. The load is 2.16 kg and the temperature is 190 ° C. (3) Composition distribution variation coefficient (Cx) Measured using a multifunctional LC manufactured by Tosoh Corporation. The ethylene / α-olefin copolymer used in Examples and Comparative Examples was 14
The resin was dissolved in an orthodichlorobenzene solvent heated to 0 ° C, placed in a column filled with sea sand in a column oven, and the temperature of the oven was lowered to -14 ° C. Subsequently, the temperature was raised to a predetermined temperature, and the relative concentration and the degree of branching of the copolymer flowing out during that time were measured by FT-IR connected to a column. The temperature was raised to the final temperature while obtaining the relative concentration and the degree of branching of the copolymer flowing out at each set temperature. A composition distribution curve was obtained from the obtained relative concentration and the degree of branching, and a composition distribution variation coefficient Cx representing the average composition and the breadth of the distribution was obtained from the curve. (4) Cold xylene soluble part (a) US code of federal regulations, Food and Drugs
The method specified in §175.1520 of the Administration was followed. (5) Swell ratio (SR) The diameter D of the extruded strand is measured using a melt flow rate measuring device specified in JIS K7210, and the ratio D / D ₀ to the diameter D _{0 of} the orifice is measured. The swell ratio was determined. Measurement temperature is 19
Performed at 0 ° C. (6) [g] ^* Chromatix L for Tosoh GPC (HLC811)
Connect ALLS equipment (KMX-6), solvent tetralin, concentration =
The measurement was performed at 0.5% by weight, temperature = 140 ° C., and flow rate = 1 ml / min. (7) Haze (haze degree) The haze was measured according to the method defined in ASTM D1003. The smaller the value, the better the transparency. (8) Drop weight impact strength According to the method specified in ASTM D1709. The higher the value, the higher the strength and the better the stretch film. (9) Tensile elongation at break The method specified in JIS K6781 was followed. The higher the value, the better the elongation properties and the better the stretch film. (10) Adhesiveness The processed film was slit into 400 mm width, rewound around a paper tube, and adjusted at 23 ° C. for 18 hours.
Then, the sample for the temperature 23 ° C. taken out in a state in close contact from the paper tube in two upper and lower, under the conditions of 50% RH, using a vertical peelable blocking tester, the load movement speed 20 g / min 100 cm ² A peeling force was applied to the contact portion, and a force (g / 100 cm ² ) required for peeling was measured. The higher the value, the higher the adhesive strength and the better the stretch film.

Table 1 shows the physical properties of the ethylene / α-olefin copolymer (A) used, and Table 2 shows the physical properties of the low-density polyethylene (B) obtained by the high-pressure radical polymerization method. Is shown in Table 3.

Examples 1 to 5 and Comparative Examples 1 and 2 The component (A) and the component (B) or the component (C) were mixed with a tumble mixer so as to have the compositions shown in Tables 4 and 5, and ethylene An α-olefin copolymer composition was obtained, and this was extruded with a 40 mm / 50 mm φ co-extruder manufactured by Modern Machinery (L /
D = 32), die 600 mm width, lip 0.9 mm width,
Using a T-die processing machine, the processing temperature was 280 ° C and the extrusion rate was 34.
kg / h, chill roll temperature 30 ° C, take-off speed 75m
A film having a thickness of 18 μm was processed under the conditions of / min. Tables 4 and 5 show the physical properties of the obtained films.

[0031]

[Table 1] (Note 1) 4.8 × 10 ⁴ × (0.95-d) ³ +10 ⁶ × (0.95-d) ⁴ +1 A1: Made by Evolu Japan, sold by Sumitomo Chemical Co., Ltd.
Sumikasen E FV403 A2: manufactured by Nippon Evolu Co., Ltd., sold by Sumitomo Chemical Co., Ltd.
Sumikasen E FV402 A3: Sumikasen α FZ202, manufactured by Sumitomo Chemical Co., Ltd.
-0 A4: Sumikasen α FZ201, manufactured by Sumitomo Chemical Co., Ltd.
-0 A1 to A4 are all ethylene-hexene-1 copolymers

[0032]

[Table 2] (Note 2) 1.81 × 10 ^-1 × log (MFR) +1.58 B1, B2: Sumikasen, manufactured by Sumitomo Chemical Co., Ltd., manufactured by high-pressure radical polymerization

[0033]

[Table 3] C1: Idemitsu Petrochemical Co., Ltd., Idemitsu Polyethylene 44
0M C2: Chemiretz 2010, manufactured by Maruzen Polymer Co., Ltd.

[0034]

[Table 4]

[0035]

[Table 5]

[0036]

As described in detail above, according to the present invention, a stretch film exhibiting excellent adhesiveness and exhibiting extremely excellent performance in transparency and impact strength can be provided. Further, the present invention can provide a stretch film which is excellent in food hygiene.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C08L 23:06)

Claims (3)

[Claims] An ethylene / α-olefin copolymer (A) component having the following properties (a-1) to (a-5): 80 to 99.5.
Ethylene / α-olefin copolymer composition containing 20% to 0.5% by weight of a low density polyethylene (B) component or 20 to 0.5% by weight of a high density polyethylene (C) component by high pressure radical polymerization A stretch film characterized by being made of a material. 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 to 0.935 g / cm ³ (a-4) Composition distribution variation coefficient Cx defined by the following equation (1)
Is 0.5 or less Cx = σ / SCBave. Equation (1) σ: Standard deviation of composition distribution SCBave .: Average value of short-chain branching per 1000C (1/1)
000C) (a-5) The weight ratio a (wt%) of the cold xylene-soluble portion is the density d.
A <4.8 × 10 ⁴ × (0.95-d) ³ +10 ⁶ × (0.95-d) ⁴ +1 Equation (2) that satisfies the relational expression (2) with (g / cm ³ ) 2. The stretch film according to claim 1, wherein the low-density polyethylene (B) component obtained by the high-pressure radical polymerization method has the following properties (b-1) to (b-3). Component (B): (b-1) Melt flow rate (MFR): 0.2 to 20 g /
10 minutes (b-2) Density (d): 0.910 to 0.935 g / cm ³ (b-3) Swell ratio (SR) satisfies the following relational expression (3) with melt flow rate (MFR) 1.81 × 10 ^-1 × log (MFR) +1.58>SR> 1.29 Equation (3) 3. The high-density polyethylene (C) component has the following (c)
The stretch film according to claim 1, which has the properties of -1) to (c-3). Component (C): (c-1) Melt flow rate (MFR): 0.2 to 20 g /
10 minutes (c-2) Density (d): 0.940 g / cm ³ or more (c-3) The value of [g] ^* defined by the following formula (4) is 0.2 to 0.2
0.8 [g] ^* = [η] / [η] _l Equation (4) where [η] was measured with a tetralin solution at 135 ° C.
[Η] _l is the intrinsic viscosity of the linear high-density polyethylene having the same weight average molecular weight as the component (C), and is determined by the following formula (5). [η] _l = 4.86 × 10 ⁻⁴ [Mw] ^0.705 Formula (5) Here, [Mw] is the weight average molecular weight (GPC) of the component (C).
-By the LALLS method).