JP3098895B2 - Liquid container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid container. For details, conform to the Japanese Pharmacopoeia, transparency, heat seal strength, heat resistance, cold resistance, low temperature, flexibility at room temperature, impact resistance,
The present invention relates to a container for medical fluids containing infusions, blood, etc., or for liquids for foods such as various drinks, which has excellent bending resistance and the like.

[0002]

2. Description of the Related Art Conventionally, a large amount of glass has been used as a container material for storing and storing medical liquids. As an alternative material, a plastic container has appeared, and is currently used as a container material for eye drops, oral liquids, blood bags, blood transfusion sets, infusion solutions for transfusions, and the like. Conventionally, polyvinyl chloride is a typical example of the material of the plastic container, and the Japanese Pharmacopoeia has regulations for the container. Since this polyvinyl chloride contains a large amount of additional components such as a plasticizer added for imparting flexibility, there has been a problem that these components elute into a liquid solution, blood and the like.
In order to solve these problems, an infusion bag using an ethylene / vinyl acetate copolymer was developed. Improvements were required to increase the cost. The ultra-low-density polyethylene developed thereafter has improved strength, but has increased stickiness on the film surface, making it difficult to be put to practical use. Similarly, in the field of foods, there has been a demand for a liquid container that satisfies the requirements of safety and hygiene and uses materials having excellent physical properties.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems, conform to the Japanese Pharmacopoeia, and have transparency, heat seal strength, heat resistance, cold resistance, low temperature, flexibility at normal temperature, and An object of the present invention is to obtain a liquid container having excellent impact resistance and bending resistance.

[0004]

Means for Solving the Problems The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, have found that specific ethylene
The inventors have found that the object of the present invention can be solved by using an α-olefin copolymer, and have completed the present invention.
That is, the present invention is characterized in that a copolymer of ethylene and an α-olefin having 4 or more carbon atoms produced using a metallocene catalyst having the following properties (1) to (7) is molded. It is a container for liquid. (1) Melt flow rate (MFR) is 0.1 to 50 g
/ 10 minutes, (2) Density is 0.915 g / cm ³ or less, (3) Haze (HAZE) is 30% or less, (4) Flexural modulus (flexibility) according to ASTM D747
2,500 kg / cm ² or less, (5) Residue by ignition residue test method specified in Japanese Pharmacopoeia 0.1% by weight or less, (6) Peak of elution curve in temperature rise elution fractionation (TREF) is 1 More than one and the main peak temperature is 100 ℃
Where H is the height of the main peak and H
H / W is 1 or more when the width of height is W, (7) As measured by temperature rise elution fractionation (TREF), 5
The elution amount at 0 ° C. satisfies the following conditions: (A) When the density (D) is less than 0.91 g / cm ³ , Y (%) ≦ −4500D + 4105 (where Y ≦ 1)
00), preferably, Y (%) ≦ −4650D + 4238 (where Y ≦ 1
(B) When density (D) is 0.91 g / cm ³ or more, Y (%) ≦ 10, preferably Y (%) ≦ 7.

[0005] The present invention also provides a liquid container comprising a composition containing the following components A and B and having the properties of (a) to (d). is there. (A) Melt flow rate (MFR) is 0.1 to 30 g
/ 10 minutes, (b) Haze (HAZE) is 50% or less, (c) Residue by ignition residue test method specified in Japanese Pharmacopoeia is 0.1% by weight or less, (d) Melt tension (MT) (Component A): ethylene produced using a metallocene catalyst having the following properties (1) to (7) and α having 4 or more carbon atoms:
-Copolymer with olefin: 50 to 99% by weight, (1) Melt flow rate (MFR): 0.1 to 50 g
/ 10 minutes, (2) Density is 0.915 g / cm ³ or less, (3) Haze (HAZE) is 30% or less, (4) Flexural modulus (flexibility) according to ASTM D747
2,500 kg / cm ² or less, (5) Residue by ignition residue test method specified in Japanese Pharmacopoeia 0.1% by weight or less, (6) Peak of elution curve in temperature rise elution fractionation (TREF) is 1 More than one and the main peak temperature is 100 ℃
Where H is the height of the main peak and H
H / W is 1 or more when the width of height is W, (7) As measured by temperature rise elution fractionation (TREF), 5
The elution amount at 0 ° C. satisfies the following conditions: (A) When the density (D) is less than 0.91 g / cm ³ , Y (%) ≦ −4500D + 4105 (where Y ≦ 1)
00), preferably, Y (%) ≦ −4650D + 4238 (where Y ≦ 1
(B) When the density (D) is 0.91 g / cm ³ or more, Y (%) ≦ 10, preferably Y (%) ≦ 7, (Component B): (1) to (1) 1) 50% by weight of an ethylene polymer having the properties of 4), (1) 0.1 to 20 g of melt flow rate (MFR)
/ 10 min, (2) density 0.88 to 0.935 g / cm ³ , (3) memory effect (ME) 1.3 or more, (4) melt tension (MT) 1.0 g or more.

[0006]

DETAILED DESCRIPTION OF THE INVENTION

[1] Constituents (1) Ethylene / α-olefin copolymer (Component A) (a) Properties Ethylene / α- used as a material of the liquid container of the present invention
It is important that the olefin copolymer has the following physical properties. Melt flow rate (MFR) The MFR of the copolymer is 0.1 to 50 g / 10 min, preferably 0.5 to 30 g / 10 min, particularly preferably 1 to 1 g / min.
5 g / 10 min. If the MFR is too high, the strength at low temperatures is insufficient, which is not preferable. Excessively low MFR is not preferable because extrusion becomes difficult.

[0007] Density Density copolymer is, 0.915 g / cm ³ or less, preferably 0.910 g / cm ³ or less, particularly preferably 0.905g
/ Cm ³ or less. If the density is too high, transparency and flexibility become poor, which is not preferable.

[0008] Haze [0008] The copolymer is subjected to compression molding (press molding: JIS K67).
60), a pressed sheet having a thickness of 2 mm was formed, and the value of HAZE measured according to JIS K7105 was 30% or less, preferably 20% or less.
Especially preferably, it is 15% or less. If the HAZE is larger than the above range, the transparency of the molded container is poor, which is not preferable.

Flexibility The copolymer has a flexural modulus according to ASTM D747 of 2500 kg / cm ² or less, preferably 2000 kg / cm ² or less, particularly preferably 1000 kg / cm ² or less. If the flexural modulus is large, flexibility, bending resistance and the like are inferior, which is not preferable.

Residue by Ignition Test The copolymer has a residue by an ignition residue test method defined in the Japanese Pharmacopoeia of 0.1% by weight or less.

Further, the copolymer has one or more, preferably one, peak of an elution curve in a temperature rise elution fractionation (TREF) given by the following measuring method, and a main peak temperature is 100 ° C. or lower. , Preferably at most 85 ° C, more preferably at most 75 ° C, and the H / W when the half height of the main peak is H and the width of the half height is W is 1 or more, preferably Is 1 to 20, particularly preferably 1 to 1.
5, most preferably 1 to 10, more preferred. In addition, the copolymer was subjected to temperature-rise elution fractionation (TRE).
In the measurement according to F), the amount of elution at 50 ° C. preferably satisfies the following condition. 1) When the density (D) is less than 0.91 g / cm ³ : Y (%) ≦ −4500 D + 4105 (however, Y ≦ 10
0), preferably Y (%) ≦ −4650 D + 4238
(However, Y ≦ 100) 2) When the density (D) is 0.91 g / cm ³ or more: Y (%) ≦ 10, preferably Y (%) ≦ 7

Measurement method of temperature rise elution fractionation (TREF) The measurement method of TREF is described in Journal of Applied Polymer S.
Cience. Vol.26, 2417-4231 (1981), Polymer Symposium Proceedings 2P1C09 (1988), and the like. That is, the target polyethylene is first completely melted once in a solvent. Thereafter, cooling is performed to form a thin polymer phase on the surface of the inert carrier.
Next, by elevating the temperature continuously or stepwise, first, at a low temperature, elution is carried out from the amorphous portion in the target polyethylene composition, that is, the polyethylene having a high degree of short-chain branching. As the elution temperature rises, the one with a low degree of branching gradually elutes, and finally the linear portion without branching elutes, ending the measurement. The concentration of the eluted component at each of these temperatures is detected, and the composition distribution of the polymer can be seen from a graph drawn based on the amount of elution and the elution temperature.

(B) Production of copolymer The ethylene / α-olefin copolymer used in the present invention is described in, for example, JP-A-58-19309 and JP-A-59-952.
92 Nos., The same 60-35006 JP, same 60-35007
Nos. 60-35008, 60-35009, 61-130314, JP-A-3-1630088, EP-A-420436, and WO 91/04257. And the like. Particularly, a catalyst comprising a metallocene and an alumoxane, or a metallocene compound as disclosed in, for example, International Publication WO92 / 01723 and a metallocene compound described below reacts stably with the metallocene compound described below. It can be produced by copolymerizing ethylene as a main component and an α-olefin as a subcomponent using a catalyst comprising a compound which becomes an anion.

The above-mentioned compound which reacts with the metallocene compound to form a stable anion is an ionic compound or an electrophilic compound formed from an ion pair of a cation and an anion. To form polymerization active species. this house,
The ionic compound is represented by the following formula (I). [Q] ^{m +} [Y] ^m- (I) Q is a cation component of an ionic compound, and is a carbonium cation, a trovirium cation, an ammonium cation, an oxonium cation, a sulfonium cation,
Examples thereof include a phosphonium cation, and further, a metal cation or an organic metal cation which is easily reduced by itself. These cations are described in Tokuhei Hei 1-501.
Not only a cation capable of providing a proton as disclosed in Japanese Patent No. 950 and the like, but also a cation that does not provide a proton may be used. Specific examples of these cations include triphenylcarbonium, diphenylcarbonium, cycloheptatrienium, indenium, triethylammonium, tripropylammonium, tributylammonium, N, N-dimethylanilinium,
Dipropylammonium, dicyclohexylammonium, triphenylphosphonium, trimethylphosphonium, tri (dimethylphenyl) phosphonium, tri (methylphenyl) phosphonium, triphenylsulfonium, triphenyloxonium, triethyloxonium, pyrylium, silver ion, gold ion , Platinum ion, palladium ion, mercury ion, ferrocenium ion and the like.

Y is an anionic component of an ionic compound, which is a component which reacts with a metallocene compound to form a stable anion, such as an organic boron compound anion, an organic aluminum compound anion, an organic gallium compound anion, and an organic phosphorus compound. Anions, organic arsenic compound anions, organic antimony compound anions, and the like, specifically, tetraphenylboron, tetrakis (3,4,
5-trifluorophenyl) boron, tetrakis (3,
5-di (trifluoromethyl) phenyl) boron, tetrakis (pentafluorophenyl) boron, tetraphenylaluminum, tetrakis (3,4,5-trifluorophenyl) aluminum, tetrakis (3,5-di (trifluoromethyl) Phenyl) aluminum, tetrakis (3,5-di (t-butyl) phenyl) aluminum, tetrakis (pentafluorophenyl) aluminum, tetraphenylgallium, tetrakis (3,4
5-trifluorophenyl) gallium, tetrakis (3,5-di (trifluoromethyl) phenyl) gallium, tetrakis (3,5-di (t-butyl) phenyl)
Gallium, tetrakis (pentafluorophenyl) gallium, tetraphenylphosphorus, tetrakis (pentafluorophenyl) phosphorus, tetraphenylarsenic, tetrakis (pentafluorophenyl) arsenic, tetraphenylantimony, tetrakis (pentafluorophenyl) antimony, decaborate, undeca Borate, carbado decaborate, decachloro decaborate and the like. Further, as the electrophilic compound, among compounds known as Lewis acid compounds, those which react with a metallocene compound to form a stable anion to form a polymerization active species, and are used as various metal halide compounds and fixed acids. Known metal oxides and the like can be mentioned. Specific examples include magnesium halide and Lewis acidic inorganic oxide.

Examples of the method for co-polymerizing ethylene and an α-olefin include a gas phase method, a slurry method, a solution method, and a high pressure ionic polymerization method. Among these, a solution method and a high-pressure ionic polymerization method are preferable, and a high-pressure ionic polymerization method is particularly preferable in that the effects of the present invention are greatly exerted.
This high-pressure ionic polymerization method is described in JP-A-56-186.
07 and JP-A-58-225106, each having a pressure of 200 kg / cm ² or more, preferably 300 kg / cm ² or more.
This is a continuous method for producing an ethylene polymer, which is carried out under a reaction condition of about 2000 to 2000 kg / cm ² and a temperature of 125 ° C. or more, preferably 130 to 250 ° C., particularly preferably 150 to 200 ° C.

The α-olefin copolymerized with ethylene is an α-olefin having 4 or more carbon atoms.
-Butene, 1-pentene, 1-hexene, 1-octene, 1-heptene, 4-methylpentene-1, 4-methylhexene-1,4,4-dimethylpentene-1, octadecene and the like. Among them, preferably 4 to 18 carbon atoms, particularly preferably 4 to 12 carbon atoms, most preferably 1 to 2 or more α-olefins having 6 to 10 carbon atoms, 2 to 60% by weight, preferably 5 to 5%. 50% by weight, particularly preferably 10-30% by weight, ethylene 40-98% by weight, preferably 50-95% by weight, particularly preferably 7% by weight.
It is preferable to copolymerize 0 to 90% by weight.

(2) Ethylene Polymer (Component B) (a) Properties It is important that the ethylene polymer which is one of the components of the resin composition used in the present invention has the following physical properties. is there. MFR The ethylene polymer has an MFR of 0.1 to 20 g / 10
Min, preferably 0.3 to 10 g / 10 min, particularly preferably 0.5 to 5 g / 10 min. If the MFR is too high,
Molding stability is poor, which is not preferable. If the MFR is too low,
Extrusion becomes difficult and is not preferred. Density The density of the ethylene polymer is 0.88 to 0.935 g /
cm ³ , preferably 0.90 to 0.93 g / cm ³ , particularly preferably 0.905 to 0.925 g / cm ³ . If the density is too high, transparency and flexibility are poor, which is not preferable. If the density is too low, the amount of sticky components increases, which is not preferable for hygiene. Memory Effect (ME) The ME of the ethylene polymer is at least 1.3, preferably at least 1.6, particularly preferably at least 1.8, most preferably at least 2.0. If the ME is too small, the molding stability is poor, which is not preferable. Melt tension (MT) The MT of the ethylene-based polymer is at least 1.0 g, preferably at least 1.5 g, particularly preferably at least 2.5 g, most preferably at least 5 g. If the MT is too small, the molding stability is poor, which is not preferable.

(B) Specific Examples Specific examples of the ethylene-based polymer include polyethylene, an ethylene / α-olefin copolymer other than the component A,
High-pressure low-density polyethylene, ethylene-vinyl acetate copolymer, ethylene-acrylate copolymer, ethylene-α-olefin-diene copolymer, etc. Can be appropriately selected, but is preferably a high-pressure low-density polyethylene, and more preferably a reaction temperature of 220 ° C. or higher and a reaction pressure of 1700 kg / cm ^2.
In the following, it is preferable to use a high-pressure low-density polyethylene produced by an autoclave method.

[2] Composition Containing Component A and Component B (1) Compounding Ratio The compounding ratio of each component in the resin composition containing component A and component B is as follows: component A: component B = 50: 50-9
9: 1% by weight, preferably 60:40 to 95: 5% by weight, particularly preferably 70:30 to 90: 10% by weight. In the polymer component used in the present invention, commonly used auxiliary additives, for example, heat stabilizers, antioxidants, light stabilizers, ultraviolet absorbers, neutralizers, lubricants, antiblocking agents , An antifogging agent, a coloring agent, and the like.

(2) Properties of Composition MFR The composition used in the present invention has an MFR of 0.1 to 30 g.
/ 10 minutes, preferably 0.5 to 10 g / 10 minutes, particularly preferably 1 to 5 g / 10 minutes. If the MFR is too high, the impact resistance and the like are poor, which is not preferable. If the MFR is too low, extrusion during molding becomes difficult, which is not preferable. Haze The composition has a HAZE of 50% or less, preferably 30% or less.
Or less, particularly preferably 20% or less. If the HAZE is large, the contents cannot be clearly identified, and the practicability decreases, which is not preferable. Residue by Ignition Test The composition has a residue by an ignition residue test method specified in the Japanese Pharmacopoeia of 0.1% by weight or less. Melt tension (MT) The MT of the composition is at least 1.0 g, preferably at least 1.5 g, particularly preferably at least 2.5 g. If the MT is too small, molding becomes unstable, which is not preferable.

[3] Liquid Container The liquid container of the present invention can be molded by a usual method. Generally, by air-cooling inflation molding, water-cooling inflation molding, T-die molding, blow molding, etc., the thickness is 30 to 800 μm, preferably 50 to 300 μm.
It is preferred to manufacture m liquid containers. For example, when an ethylene / vinyl acetate copolymer is used, a predetermined container is manufactured by air-cooled inflation molding or water-cooled inflation molding, and the container is irradiated with an electron beam to obtain a container for the purpose. Specific examples of the liquid container of the present invention include medical fluid containers such as infusion bags, infusion bottles, blood transport bags, blood freezing bags, and transfusion bags for artificial dialysis, and various beverages, and foods such as concentrated beverages. It is a container for liquids and the like.

[0023]

EXAMPLES Examples of the present invention will be described below to specifically explain the present invention. The measuring methods used in the examples and comparative examples are as follows. (1) MFR: Conforms to JIS K7210 (2) Density: Conforms to JIS K7112 (3) ME: Use a melt indexer used in JIS K7210, measurement conditions are cylinder temperature 240
C., constant-rate extrusion rate of 3 g / min. The device is filled with the sample, only the piston is loaded and a defined extrusion rate is applied after 6 minutes. Next, a measuring cylinder containing ethyl alcohol is placed immediately below the orifice, and a straight extrudate is collected. The diameter (D) of the extruded material is measured with a micrometer, and the orifice diameter of the die is D0, and ME is calculated by the following equation. ME = D / D0 (4) MT: Capillograph 1-B manufactured by Toyo Seiki Co., Ltd., at a test temperature of 190 ° C. and at an extrusion speed of 1 cm / min, gradually increasing the take-off speed when taking out the extruded resin, thereby obtaining a resin filament. Is the stress when sheared.

(5) Elution curve: TREF was measured under the following conditions. Model: Mitsubishi Yuka CFC T150A Solvent: o-dichlorobenzene Flow rate: 1 ml / min Measurement concentration: 4 mg / ml Injection volume: 0.4 ml Column: Showa Denko AD80M / S 3 Cooling rate: 1 ° C / min Drawing, H How to determine / W : In drawing an elution curve, first, the weight fraction of the eluted material at each elution temperature is integrated to determine the integrated elution amount. The elution temperature is plotted on the horizontal axis, and the integrated elution amount is plotted on the vertical axis, to create an integrated elution curve. This integral elution curve is differentiated with respect to temperature to obtain a differential elution amount. Next, the elution temperature is plotted on the horizontal axis and the differential elution amount is plotted on the vertical axis, and a differential elution curve is created. A value obtained by dividing the peak height of this differential elution curve by a half height width is H / W. The drawing of the differential elution curve was performed with the horizontal axis at 89.3 mm per 100 ° C. of elution temperature and the vertical axis at 76.5 mm per 0.1 differential. (6) HAZE: Conforms to JIS K7105 (7) Flexural modulus: Conforms to ASTM D747 (8) Tensile elasticity: Conforms to ISO R1184 (9) Residue on ignition: Conforms to the Japanese Pharmacopoeia General Test Method

(10) Vicat softening point temperature: JIS K72
(11) Embrittlement temperature: Conforms to the Dentsu Kenkyu Law (notch depth: 0.3
mm) (12) 300 g heat sealing temperature: using a hot plate heat sealer manufactured by Toyo Seiki, sealing pressure 2 kg / cm ² , sealing time 1
Heat seal in seconds and measure heat seal strength with a tensile tester. This heat seal strength is 300g / 15m
The temperature obtained is 300 g heat seal temperature. (13) DDI (Dirt Drop Impact): JIS Z
Conforms to 1707 (14) Taste and odor sensory value: One set of film is sealed on three sides,
Fill with pure water and top seal to make a sample. This is left in a 60 ° C. gear oven for 24 hours. After standing, the seal is broken, pure water is transferred to an Erlenmeyer flask, and a sensory test is performed using the sample as a sample. Sensory value 0: Odorless (or tasteless) 1: Feel at last 2: Feel (you know what smell (or taste)) 3: Smell considerably (or taste) (feel comfortable) 4: Strong smell (or taste) 5) Smells (or tastes) violently (it is unbearably strong). The average value of the sensory values of 10 samplers was as shown in Table 1.

Example 1 (1) Method for Producing Ethylene / α-Olefin Copolymer The catalyst was prepared by the method described in JP-A-61-130314. That is, to 2.0 mmol of ethylene bis (4,5,6,7-tetrahydroindenyl) zirconium dichloride, methylalumoxane (manufactured by Toyo Stouffer) was added 1000 times as much as the above complex, and diluted to 10 liters with toluene. A catalyst solution was prepared and polymerized by the following method. A mixture of ethylene and 1-hexene was added to a 1.5-liter stirred autoclave-type continuous reactor in which the composition of 1-hexene was 80%.
% By weight, and the pressure in the reactor is 1000
The reaction was carried out at a temperature of 150 ° C. while maintaining the pressure at kg / cm ² . After the completion of the reaction, the MFR is 3.5 g / 10 minutes, and the density is 0.900 g.
/ Cm ³ , an ethylene / 1-hexene copolymer having one peak in the TREF elution curve, a peak temperature of 57 ° C., and an H / W of the peak of 3 was obtained.

(2) Production of Ethylene Polymer Ethylene was reacted at a reaction temperature of 260 ° C. and a reaction pressure of 1500 kg / cm.
^{In 2} , polymerization was carried out by an autoclave method. After the reaction is completed, MF
R: 4 g / 10 min, density: 0.92 g / cm ³ , MT: 9.8
g, a polyethylene having an ME of 2.5 was obtained.

(3 ) Blending, molding and evaluation of the polymer The components A and B were blended at a ratio of 90: 10% by weight of component A: component B, and formed at a molding temperature of 160 ° C. with a 40 mmφ single screw extruder. The pelletized resin composition was obtained. The Vicat softening point temperature and the embrittlement temperature of the composition were measured, and then a T-die film was formed using the pellets under the following conditions.
DDI, HAZE, and tensile modulus were evaluated. Furthermore, one set of this film is sealed on three sides, and the contents (pure water)
And a top seal was obtained to obtain a model sample. This was evaluated for taste and smell. The results of the evaluation are as shown in Table 1. (Molding conditions) Model: Placo 35mmφT die molding machine Molding temperature: 250 ° C Film thickness: 100μm

[0029]

[Table 1]

Example 2 and Comparative Example 1 Molding and evaluation were performed in the same manner as in Example 1 except that the components A and B having physical properties shown in the table were used. The results of the evaluation are as shown in Table 1.

[0031]

The liquid container of the present invention conforms to the Japanese Pharmacopoeia and is excellent in transparency, heat seal strength, heat resistance, cold resistance, low temperature, flexibility at normal temperature, impact resistance, bending resistance, etc. Therefore, it is suitable for applications such as medical liquid containers or food liquid containers, and is industrially useful.

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B65D 1/09 A61J 1/10

Claims (2)

(57) [Claims] 1. A liquid obtained by molding a copolymer of ethylene and an α-olefin having 4 or more carbon atoms produced using a metallocene catalyst having the following properties (1) to (7) : Container : (1) Melt flow rate (MFR) is 0.1 to 50 g
/ 10 minutes , (2) Density is 0.915 g / cm ³ or less , (3) Haze (HAZE) is 30% or less , (4) Flexural modulus (flexibility) according to ASTM D747
2,500 kg / cm ² or less , (5) Residue by ignition residue test method specified in Japanese Pharmacopoeia 0.1% by weight or less , (6) Elution curve in temperature-rise elution fractionation (TREF)
One or more peaks, and the temperature of the main peak is 100 ° C.
And H / W is 1 or more when the height of the main peak is H and the width of the 1/2 height is W, (7) Measurement by temperature rise elution fractionation (TREF) , 5
The elution amount at 0 ° C. satisfies the following conditions: (A) When the density (D) is less than 0.91 g / cm ³ , Y (%) ≦ −4500D + 4105 (where Y ≦ 1)
00), preferably, Y (%) ≦ −4650D + 4238 (where Y ≦ 1
00), (B) when the density (D) is 0.91 g / cm ³ or more, Y (%) ≦ 10, preferably, Y (%) ≦ 7. 2. It contains the following components A and B, and (a)
(D) a melt flow rate (MFR) of 0.1 to 30 g, which is obtained by molding a composition having the following properties :
/ 10 minutes , (b) Haze (HAZE) is 50% or less , (c) Residue by ignition residue test method specified in Japanese Pharmacopoeia is 0.1% by weight or less , (d) Melt tension (MT) but above 1.0 g, (Ingredients a): the following (1) to the ethylene and having 4 or more carbon atoms properties was produced with a metallocene catalyst having the (7) alpha
-Copolymer with olefin: 50 to 99% by weight, (1) Melt flow rate (MFR): 0.1 to 50 g
/ 10 minutes , (2) Density is 0.915 g / cm ³ or less , (3) Haze (HAZE) is 30% or less , (4) Flexural modulus (flexibility) according to ASTM D747
2,500 kg / cm ² or less , (5) Residue by ignition residue test method specified in Japanese Pharmacopoeia 0.1% by weight or less , (6) Elution curve in temperature-rise elution fractionation (TREF)
One or more peaks, and the temperature of the main peak is 100 ° C.
Where H is the height of the main peak and H
H / W is 1 or more when the width of height is W, (7) As measured by temperature rise elution fractionation (TREF), 5
The elution amount at 0 ° C. satisfies the following conditions: (A) When the density (D) is less than 0.91 g / cm ³ , Y (%) ≦ −4500D + 4105 (where Y ≦ 1)
00), preferably, Y (%) ≦ −4650D + 4238 (where Y ≦ 1
00), (B) When density (D) is 0.91 g / cm ³ or more, Y (%) ≦ 10, preferably Y (%) ≦ 7, ( Component B ) : (1) to (1) 1) 50% by weight of an ethylene polymer having the properties of 4), (1) 0.1 to 20 g of melt flow rate (MFR)
/ 10 min , (2) density 0.88 to 0.935 g / cm ³ , (3) memory effect (ME) 1.3 or more, (4) melt tension (MT) 1.0 g or more .