JPH1072539A - Agricultural film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an agricultural film which is formed from an ethylene resin compsn., is lightweight and excellent in heat retaining properties, has high clarity, tensile strength, impact strength, and scratch resistance, has excellent film properties, and is most suitable for agricultural houses, agricultural curtains, etc. SOLUTION: This film is formed from an ethylene resin compsn. which comprises an ethylene/4C or higher α-olefin copolymer (A) having a melt flow rate of 0.01-10g/10min, a density of 0.925g/cm<3> or lower, at least one peak in the elution curve obtd. by temp. rise elution fractionation. the main peak of the elution curve at 100 deg.C or lower, and a Q value of gel permeation chromatography of 3 or lower an inorg. compd. (B) contg. at least one atom selected from among Si, Al, Mg, and Ca.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agricultural house which is lightweight, has excellent heat retention, has excellent transparency, tensile tear resistance, good impact tear resistance, and has excellent film suitability such as being hardly damaged. The present invention relates to an agricultural film most suitable for use as an agricultural curtain or the like.

[0002]

2. Description of the Related Art Conventionally, as a greenhouse covering material used for greenhouse cultivation of agricultural houses, agricultural curtains and the like, polyvinyl chloride films, ethylene / vinyl acetate copolymer films and the like have been used. The polyvinyl chloride film is excellent in heat retention, transparency, toughness, etc.,
Until recently, it has been heavily used in this type of field. However, in such a polyvinyl chloride film, during use, the plasticizer contained in the film bleeds to the surface of the film, so that dust adheres to the film and the light transmittance is deteriorated with time. However, there is a disadvantage that the temperature inside the house is prevented from rising. In addition, when incinerated after use, harmful hydrogen chloride gas is generated, so that disposal is difficult. Furthermore,
Since the polyvinyl chloride resin itself has a large specific gravity, its film is heavy, and it is a very labor-intensive operation to stretch over several tens of meters on the framework of a greenhouse. Therefore, such an operation is a difficult operation with the aging of farmers, and in recent years, light and easy-to-handle materials have been required.

On the other hand, an ethylene / vinyl acetate copolymer is
Difficult to adhere dust like general polyolefin resin,
It is superior to polyvinyl chloride in that no harmful gas is generated even after incineration. However, since the film is not as transparent as a polyvinyl chloride film, the light transmittance is low, and the strength of the film is insufficient. For example, tearing is likely to occur due to such reasons, and after about one year, replacement is necessary, and it has been difficult to use for a long period of time. Therefore, in order to prevent such tears,
Normally, a method of increasing the thickness of the film is adopted, but the thickness of a standard house film in the market is 10
Since the thickness is about 0 μm, there is a demand for thinning, but it has been difficult with an ethylene / vinyl acetate copolymer to satisfy the above mechanical properties. In addition, the ethylene-vinyl acetate copolymer film is used when the film is stretched, when the film is rolled up in the summer or during the day, or when the film is rubbed against the frame of a greenhouse or the like. There was also a disadvantage that the surface of the film was easily damaged. In order to impart heat retention, various inorganic substances may be added to the film for improvement.
No. 7-13853 (silica powder), Japanese Patent Publication 3-50
No. 791 (magnesium compound), JP-B-62-3
No. 1744 (Hydrotalcite), the addition of these inorganic substances makes the surface of the film more easily damaged, and such a large problem has been demanded as an improvement. .

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve such problems, to be light, excellent in heat retention, excellent in transparency, tensile tear resistance, impact tear resistance, and resistant to scratches. It is another object of the present invention to provide an agricultural film made of an ethylene-based resin composition having excellent film suitability and capable of reducing the thickness.

[0005]

[Means for Solving the Problems]

[Summary of the Invention] The present inventors have intensively studied to obtain an agricultural film comprising an ethylene-based resin composition which is superior in performance to conventional agricultural films and is most suitable as an agricultural film material. As a result, the finding that the object of the present invention can be achieved by blending an ethylene / α-olefin copolymer having a specific property and an inorganic compound having a specific property in a specific quantitative ratio. As a result, the present invention has been completed. That is, the agricultural film of the present invention comprises: Component (A): a melt flow rate (MFR) of 0.01 to 10 g / 10 min, a density of 0.925 g / cm ³ or less, and a temperature rise elution fractionation (TREF). Q value (weight average molecular weight / number average molecular weight) determined by gel permeation chromatography (GPC) when there is one or more peaks in the elution curve obtained by 85 to 99% by weight of an ethylene / carbon number α-olefin copolymer having a carbon number of 3 or less, and component (B): an inorganic material containing at least one atom selected from Si, Al, Mg and Ca. It is characterized by being formed from an ethylene-based resin composition comprising 15 to 1% by weight of a compound.

[Specific description of the invention] [I] Ethylene-based resin composition (1) Constituents The ethylene-based resin composition used as a raw material of the agricultural film of the present invention comprises the following components (A) and From (B),
Alternatively, it is composed of component (C) used as required. (A) α-olefin copolymer having 4 ethylene atoms or more (component (A)) (a) Properties α-olefin having 4 ethylene atoms or more of component (A) in the ethylene resin composition The copolymers are as follows:
It is preferable that the material exhibit physical properties of, in particular, the material exhibiting physical properties of.

Melt flow rate (MFR) Ethylene used in the present invention, α having 4 or more carbon atoms
-The olefin copolymer is M according to JIS-K7210.
FR (Melt Flow Rate: Melt Flow Ra)
te: melting flow rate) 0.01 to 10 g / 10 min, preferably 0.1 to 5 g / 10 min, particularly preferably 0.5 to 3 g / min.
It shows physical properties of g / 10 minutes. If the MFR is larger than the above range, the molding becomes unstable. In addition, the MFR
Is smaller than the above range, the resin pressure at the time of molding becomes too large, and the production of the product is reduced, which is not practical.

[0008] Density α of ethylene and carbon number 4 or more used in the present invention
-The olefin copolymer has a density according to JIS-K7112 of 0.925 g / cm ³ or less, preferably 0.87 to
0.915 g / cm ³ , particularly preferably 0.88 to 0.5 g / cm ³ .
It shows 910 g / cm ³ . If the density is higher than the above range, the transparency will be deteriorated. On the other hand, if the density is lower than the above range, blocking occurs due to stickiness of the film surface, and the film cannot be put to practical use.

The peak of the elution curve obtained by temperature-rise elution fractionation (TREF) The α-olefin copolymer having 4 or more ethylene and carbon atoms used in the present invention is obtained by temperature-rise elution fractionation (TREF: T
emperature Rising Elution
One or more, preferably one, peak of the elution curve obtained by fractionation, and the temperature of the main peak is 100 ° C. or lower, preferably 85 ° C. or lower,
Particularly preferably, it is 75 ° C. or lower. Measurement of elution curve by temperature rise elution fractionation Temperature rise elution fractionation (Temperature Risi)
ng ElutionFractionation: T
The measurement of the elution curve by REF) is described in “Journal
of Applied Polymer Science
e, Vol 26, 4217-4231 (198
1)), is performed as follows based on the principle described in “1). First, a polymer to be measured is completely dissolved in a solvent. Thereafter, cooling produces a thin polymer layer on the surface of the inert carrier. Such a polymer layer is likely to be crystallized inside (the side close to the inert carrier surface)
In addition, what is difficult to crystallize is formed on the outside. Next, when the temperature is continuously or stepwise increased, in the low temperature step, the amorphous portion in the target polymer composition, that is, the polymer having a high degree of short-chain branching having a high degree of branching is eluted, and the temperature rises. The one with a small degree of branching gradually elutes, and finally the linear part with little branching elutes, and the measurement ends. 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 the eluted and the elution temperature.

[0010] 50 by temperature rise elution fractionation (TREF)
Elution amount at 50 ° C. The elution amount at 50 ° C. (Y: weight% based on the total amount of component A) of the α-olefin copolymer having ethylene and carbon atoms of 4 or more by temperature rise elution fractionation (TREF) used in the invention is as follows. It is optimal to satisfy the conditions of 1) and 2). 1) When the density (D) of the component A is less than 0.91 g / cm ³ , Y (% by weight) ≦ −4500D + 4105 ≦ 10
0, preferably Y ≦ −4650D + 4238 ≦ 100. 2) When the density (D) of the component A is 0.91 g / cm ³ or more, Y (% by weight) ≦ 10, preferably Y ≦ 7.

Q value Gel permeation chromatography (G) of such an α-olefin copolymer having 4 or more carbon atoms.
The Q value (weight average molecular weight / number average molecular weight) determined by (PC) is 4 or less, preferably 3 or less, particularly preferably 2.5 or less. If the Q value is too large, the tensile strength tends to decrease.

(B) Production of α-olefin copolymer having ethylene / carbon number of 4 or more Metallocene catalyst Such α-olefin copolymer having ethylene / carbon number of 4 or more is disclosed in JP-A-58-19309. 59-952
No. 92, No. 60-35005, No. 60-35006
JP-A-60-35007, JP-A-60-35008, JP-A-60-35009, JP-A-61303401, and JP-A-3-1630088, European Patent Application Publication No. 4,204,436, US Patent 5,05
5,438 and International Publication WO 91/042
No. 57, particularly a metallocene catalyst, particularly a metallocene / alumoxane catalyst, or a metallocene compound and a metallocene compound described below, for example, as disclosed in International Publication WO92 / 01723 and the like. Using a catalyst consisting of a compound that becomes a stable anion by reacting with ethylene and ethylene
This is a method of copolymerizing the above-mentioned α-olefin.

The above-mentioned compound that 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. It becomes an ion to form a polymerization active species. Among them, the ionic compound is represented by the following general formula (I). General formula (I) [Q] ^{m +} [Y] ^m− (m is an integer of 1 or more) In the above formula, Q is a cation component of an ionic compound, and is a carbonium ion, a tropylium cation, an ammonium cation, or an oxo compound. Cations, sulfonium cations, phosphonium cations and the like. Further, cations of metals and cations of organic metals which are easily reduced by themselves are also included. These cations are listed in
Not only a cation capable of giving a proton as disclosed in JP-A-501950 and the like but also a cation which does not give a proton may be used. Specific examples of these cations include triphenylcarbonium, diphenylcarbonium, cycloheptatrienium, indenium,
Triethylammonium, tripropylammonium,
Tributylammonium, N, N-dimethylanilium dipropylammonium, dicyclohexylammonium, triphenylphosphonium, trimethylphosphonium, tri (dimethylphenyl) phosphonium, tri (methylphenyl) phosphonium, triphenylsulfonium, triphenyloxonium, triethyloxonium , Pyrylium, silver ion, gold ion, platinum ion, copper ion, palladium ion, mercury ion, ferrocenium ion and the like. Y is an anionic component of an ionic compound, which is a component that reacts with a metallocene compound to form a stable anion, and includes an organic boron compound anion, an organic aluminum compound anion, an organic gallium compound anion, an organic phosphorus compound anion, and an organic compound. 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 (3,5-di (t-butyl) 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, undecaborate, carbadodecaborate, decachlorodecaborate and the like can be mentioned.

As the electrophilic compound, compounds known as Lewis acid compounds, which react with a metallocene compound to form a stable anion to form a polymerization active species, include various metal halide compounds, Examples include metal oxides known as solid acids. Specific examples include magnesium halides and Lewis acidic inorganic compounds.

The α- olefin minor component as the α- olefin having 4 or more carbon α-
Olefins such as 1-butene, 1-pentene, 1-
Hexene, 1-octene, 1-heptene, 4-methylpentene-1, 4-methylhexene-1, 4,4-dimethylpentene-1 and the like. Among these α-olefins, preferably 4 to 12 carbon atoms, particularly preferably 6 to 12 carbon atoms.
2 to 60% by weight, preferably 5 to 50% by weight, of one or more α-olefins of 10 and 40 to 98% of ethylene
% By weight, preferably from 50 to 95% by weight.

[0017] The polymerization method for copolymerizing the ethylene having 4 or more carbon atoms α- olefin copolymer, vapor phase method, slurry method, a solution method and a high pressure ion polymerization method. Among these, a solution method and a high-pressure ionic polymerization method are preferable, and a high-pressure ionic polymerization method that can greatly exert the effects of the present invention is particularly preferable. This high pressure ionic polymerization method is described in
6-18607, JP-A-58-225106, each having a pressure of 200 kg / cm ² or more;
Preferably, the temperature is 300 to 2,000 kg / cm ² and the temperature is 1
25 ° C. or higher, preferably 130 to 250 ° C., particularly 150
This is a method for continuously producing an ethylene-based polymer carried out under a reaction condition of 200 ° C.

(B) Inorganic Compound (Component (B)) The inorganic compound of component (B) constituting the ethylene resin composition used as the raw material for the agricultural film of the present invention is S
An inorganic oxide, an inorganic hydroxide or an inorganic composite compound containing at least one atom selected from i, Al, Mg, and Ca. Specifically, SiO ₂ , Al ₂ O ₃ , M
gO, CaO, Al (OH) ₃ , Mg (OH) ₂ , Ca
(OH) ₂ , and a compound represented by the following general formula (II) or a substance called a hydrotalcite in a fired product thereof. Formula (II) M 2 ⁺ _{1 -x} Al _x (OH) ₂ (A ⁿ⁻ ) _{x / n} · mH ₂ O (wherein M ²⁺ is selected from the group consisting of Mg, Ca and Zn) It represents a valent metal ion, and x and m satisfy the following conditions: 0 <x <0.5, 0 ≦ m ≦ 2) Among these, hydrotalcites are preferred, and particularly preferred are general formulas It is a fired product of the compound represented by (II) (normally fired at 200 to 300 ° C). One or two or more of these inorganic compounds can be used in combination. These inorganic compounds preferably have an average particle size of 10 μm or less, preferably 5 μm or less, particularly preferably 3 μm or less. If the average particle size is too large, the transparency of the film is impaired, which is not preferable.

(C) Other Ingredients (Component (C)) The ethylene resin composition used as a raw material of the agricultural film of the present invention is used in order to improve the moldability in forming the film. , Ethylene polymers, such as high-pressure low-density polyethylene, ethylene-vinyl acetate copolymer,
Ethylene / ethyl acrylate copolymer, ethylene / acrylate copolymer, etc., preferably 1 to 35% by weight, preferably 3 to 35% by weight of high pressure low density polyethylene
It is preferable to add 25% by weight, particularly preferably 7 to 20% by weight. Here, the high-pressure method low-density polyethylene has an MFR of 0.1 to 20 g / 10 minutes, preferably 0.1 to 20 g / 10 minutes.
5 to 10 g / 10 min, particularly preferably 1 to 5 g / 10 min, and the density (D) is 0.915 to 0.930 g / cm.
³ , preferably 0.918 to 0.927 g / cm ³ , particularly preferably 0.919 to 0.923 g / 10 min, and ME (constant rate extrusion rate: 3 g / min) of 1.3 or more, preferably 1.6 or more, particularly preferably 1.8 or more,
Melt tension (MT) is 1.5
g or more, preferably 2.5 g or more, particularly preferably 5 g
That's all. As the high-pressure low-density polyethylene, those having the above properties can be appropriately selected and used from commercially available products, and a reaction temperature of 220 ° C. is particularly preferred.
As described above, it is desirable to use a high-pressure low-density polyethylene produced by an autoclave method at a reaction pressure of 1,700 kg / cm ² or less. Furthermore, in the ethylene-based resin composition used as a raw material of the agricultural film of the present invention, an auxiliary additive component generally used in the resin composition, for example,
Antioxidants, heat stabilizers, light stabilizers, dispersants, lubricants, anti-blocking agents, pigments, colorants, anti-fog agents, antistatic agents, ultraviolet absorbers, light stabilizers, nucleating agents, neutralizing agents, slips An additive such as an agent can be blended.

(2) Mixing ratio The mixing ratio of the above components (A) and (B) constituting the ethylene resin composition used as the raw material of the agricultural film of the present invention is as follows. (A): Component (B) = 85
% By weight: 15% by weight to 99% by weight: 1% by weight, preferably component (A): component (B) = 90% by weight: 10% by weight to 98%
% By weight: 2% by weight, particularly preferably component (A): component (B)
= 92% by weight: 8% by weight to 97% by weight: 3% by weight. If the proportion of the component (B) in the ethylene-based resin composition is too large, the transparency of the film decreases. Also the ingredients
If the proportion of (B) is too small, the level of heat retention as an agricultural film is insufficient.

(3) Blend The ethylene-based resin composition used as the raw material for the agricultural film of the present invention can be prepared by the same method as that used for producing a conventional resin composition. It can be produced by blending the α-olefin copolymer and the inorganic compound of the component B. Specifically, component (B), a small amount of component (A), and if necessary, other additives are added, and the mixture is melted and kneaded using a twin-screw kneading extruder, a Banbury mixer, a kneader, or the like. After pelletizing, a masterbatch of the component (B) is manufactured by pelletizing, and the masterbatch of the pelletized component (B) is mixed with a large amount of the component (A).
And a blender such as a Henschel mixer to produce a resin composition.

[II] Forming / Processing The ethylene resin composition used as a raw material of the agricultural film of the present invention is formed into an agricultural film by forming it into a film by T-die molding, inflation molding or the like. Can be. The film made of the ethylene-based resin composition can be used as a single layer, or can be a multilayer film laminated with another polyolefin resin.

[III] Applications The ethylene-based resin composition used as a raw material for the agricultural film of the present invention is formed into a film so that it has higher strength than a conventional film. Because the film can be thinned, it is light and
It is excellent in heat retention, excellent in tearing resistance, impact tearing resistance, transparency, and hard to be damaged, so it is extremely useful as an agricultural film used outdoors for agricultural houses, agricultural curtains, etc. is there.

[0024]

The present invention will be described more specifically with reference to the following Examples and Comparative Examples. [I] Measurement and evaluation methods of physical properties Measurement and evaluation of physical properties in Examples and Comparative Examples were carried out by the following methods. (1) Measurement method of physical properties (a) MFR: JIS-K7210 (b) Density: JIS-K7112

(C) Elution curve: Temperature rise elution fractionation (Temperature Risi) under the following measurement conditions
ng Elution Fractionation:
TREF) was measured. In preparing the elution curve, first, the weight fraction of the eluted material at each elution temperature (° C.) is integrated to obtain an integrated elution amount. Plot the elution temperature on the horizontal axis and the integrated elution amount on the vertical axis, and draw 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 drawn. The plot of this differential elution curve is shown with the horizontal axis representing the elution temperature of 100.
89.3 mm per ° C, vertical axis is 7 per 0.1 differential
The measurement was performed at 6.5 mm. Model: CFC T150A manufactured by Mitsubishi Yuka Co., Ltd. Solvent: o-dichlorobenzene Flow rate: 1 ml / min Measurement concentration: 4 mg / ml Injection amount: 0.4 ml Column: Showa Denko AD80 M / S 3 Cooling rate: 1 ° C / min

(D) Q value: The weight average molecular weight and the number average molecular weight were measured by GPC under the following measurement conditions to determine the Q value. Model: Waters Model 150C G
PC solvent: o-dichlorobenzene Flow rate: 1 ml / min Temperature: 140 ° C. Measurement concentration: 2 mg / ml Injection volume: 20 μl Column: Showa Denko AD80M / S 3

(E) Melt tension (melt tension, Mel
t Tension: MT): Test temperature 190 ° C., extrusion speed 1 cm / using Toyo Seiki Capillograph 1-B.
In minutes, the take-up speed at the time of taking out the extruded resin is gradually increased to be the stress when the resin filament is sheared.

(2) Evaluation method (a) Haze: conforms to JIS-K7105 (b) Elmendorf tear strength: conforms to JIS-Z1702 (c) Tensile strength: conforms to JIS-K6781 (d) Punch impact strength: Measurement is performed using an apparatus according to JIS-P8134. The thickness of the measurement part of the film is measured, the film is fixed to a sample table, a pendulum is shaken, and an impact is applied to the sample. The energy (kg · cm) required for the penetrating fracture is read from the scale plate, and the value is obtained by dividing the value by the sample thickness (cm). (e) Heat retention: The formed film was attached to a mini-house having a height of 60 cm and a length of 1.5 m, the temperature inside the house at 4:00 am and the temperature outside the house were measured, and the temperature difference was observed. . This was performed for 10 days, and the average value was calculated. (f) Scratch property: Two layers of the formed films are superimposed, and the surfaces are rubbed together. Then, some scratches on the rubbed surface are visually observed. When the number of scratches is small, it is represented by ○, and when it is large, it is represented by ×.

[II] Experimental Examples Example 1 (1) Production of α-olefin copolymer (component (A)) having 4 ethylene atoms or more (component (A)) (a) Preparation of catalyst It carried out by the method described in 130314 gazette. That is, to 2.0 mmol of the complex ethylenebis (4,5,6,7-tetrahydroindenyl) zirconium dichloride, methylalumoxane (manufactured by Toyo Stouffer) was added 1,000 times as much as the above complex, and diluted to 10 liters with toluene. Thus, a catalyst solution was prepared. (b) Polymerization A mixture of ethylene and hexene-1 was supplied to a stirred autoclave-type continuous reactor having an internal volume of 1.5 liters so that the composition of hexene-1 became 75% by weight. While maintaining the pressure at 1,000 kg / cm ³ , 145
The reaction was carried out at a temperature of ° C. After the reaction, MFR is 2g
/ 10 min, density 0.909 kg / cm ³ , Q value 1.
9. One peak of TREF elution curve, peak temperature of 6
An ethylene / hexene-1 copolymer (component (A)) having an elution amount of 4.8% by weight at 8 ° C. and 50 ° C. was obtained.

(2) Production of Ethylene Resin Composition First, hydrotalcite calcined product (trade name: DHT-4A-) manufactured by Kyowa Chemical Co., Ltd. was used as the inorganic substance of component (B).
2, the average particle diameter of 0.4 μm)
3 to the above α-olefin copolymer (component (A))
The mixture was granulated with a twin-screw extruder at a molding temperature of 200 ° C. so as to have a ratio of 0% by weight to obtain a master batch. This masterbatch and the above-mentioned α-olefin copolymer having 4 carbon atoms or more (component (A)) were blended at a ratio of 80:20, and granulated with a 40 mm ^φ single screw extruder to form pellets. .

(3) Film molding Using the pellets, a 40 m product made by Tommy Machine Industry Co., Ltd.
In m ^phi inflation molding machine, the molding temperature is 180 ° C.,
Inflation molding was performed at a screw rotation speed of 70 rpm to obtain a film. This film was evaluated. Table 1 shows the evaluation results. This film is
It is superior in strength to conventional films, and can be made thinner, lighter, has better heat retention, tear resistance,
Since it had good impact tear resistance and transparency and was hardly damaged, it could be used as an agricultural film.

Example 2 A resin composition was prepared in the same manner as in Example, and a film was formed and evaluated in the same manner as in Example 1 except that the film thickness at the time of forming was changed. Table 1 shows the results.

Example 3 In addition to the component (A) and the component (B), the component (C) having an MFR of 4
g / 10 min, density 0.92 kg / cm ³ , ME (constant speed extrusion rate: measured at 3 g / min) 2.4, melt tension (Mel
A film was molded and evaluated in the same manner as in Example 1 except that a high-pressure method low-density polyethylene having a (t Tension) of 9.4 g was blended as shown in Table 1. Table 1 shows the results.
Shown in

Comparative Example 1 In place of Component A, Mitsubishi Polyethylene EV manufactured by Mitsubishi Yuka Co., Ltd.
The molding temperature was C1 / C2 / die = 40 mm ^φ inflation molding machine manufactured by Mitsubishi Heavy Industries, Ltd. using A X303.
Form a film at 120 ° C / 160 ° C / 145 ° C,
evaluated. Table 4 shows the evaluation results.

Examples 4 and 5 and Comparative Examples 2 and 3 Films were formed and evaluated in the same manner as in Example 1 except that the components (A) and (B) having the physical properties shown in Tables 2 and 3 were used.
The results are shown in Tables 2 and 4.

Example 6 and Comparative Example 4 A film was formed and evaluated in the same manner as in Example 1 except that the mixing ratio of the component (B) was changed. The results are shown in Tables 2 and 4.

Example 7 Instead of the component (B) in Example 1, an uncalcined product of hydrotalcite manufactured by Kyowa Chemical Co., Ltd. (trade name: D) was used as an inorganic substance.
A film was formed and evaluated in the same manner as in Example 1 except that HT-4A (average particle size: 0.4 μm) was used. Table 2 shows the results.

Example 8 Instead of the component (B) in Example 1, an inorganic substance was used as an inorganic substance.
Phosphosilicate glass described in JP-A-3-8991 (average particle size:
3 μm, composition: 50 mol% of SiO ₂ , P ₂ O ₅ 21
Mol%, Al ₂ O ₃ 7 mol%, ZnO 5 mol%, B
_A film was formed and evaluated in the same manner as in Example 1, except that 5 mol% of ₂ O ₃ , 7 mol% of CaO, and 5 mol% of Na ₂ O) were used. Table 3 shows the results.

[0039]

[Table 1]

[0040]

[Table 2]

[0041]

[Table 3]

[0042]

[Table 4]

[0043]

As described above, the agricultural film of the present invention comprises:
Because it is superior in strength to conventional films, it is possible to make the film thinner, so it is light, and it has excellent heat retention, tensile tear resistance, impact tear resistance, good transparency,
Since it is hard to be damaged, it is extremely useful for outdoor use such as agricultural houses and agricultural curtains.

Claims (7)

[Claims] 1. Component (A): a melt flow rate (MFR) of 0.01 to 10 g / 10 min, a density of 0.925 g / cm ³ or less, and elution obtained by temperature-rise elution fractionation (TREF) There is one or more peaks in the curve, the temperature of the main peak is 100 ° C or less, and the Q value (weight average molecular weight / number average molecular weight) determined by gel permeation chromatography (GPC) is 3 or less. 85 to 99% by weight of an α-olefin copolymer having ethylene / carbon number of 4 or more and component (B): an inorganic compound containing at least one atom selected from Si, Al, Mg and Ca 15 to An agricultural film characterized by being formed from an ethylene resin composition comprising 1% by weight. 2. Fractionation (TREF) of component (A) at elevated temperature elution
The agricultural film according to claim 1, wherein the amount of elution at 50 ° C satisfying the following conditions 1) and 2). 1) When the density (D) of the component A is less than 0.91 g / cm ³ , Y (% by weight) ≦ −4500D + 4105 ≦ 100, preferably Y ≦ −4650D + 4238 ≦ 100. 2) When the density (D) of the component A is 0.91 g / cm ³ or more, Y (% by weight) ≦ 10, preferably Y ≦ 7. 3. Component (B) is SiO ₂ , Al ₂ O ₃ , Mg
O, CaO, Al (OH) ₃ , Mg (OH) ₂ , Ca
(OH) ₂ and an inorganic compound containing at least one compound selected from hydrotalcites.
The agricultural film according to claim 1. 4. The agricultural film according to claim 1, wherein the component (B) is a hydrotalcite. 5. The agricultural film according to claim 1, wherein the component (B) has an average particle size of 10 μm or less. 6. The agricultural film according to claim 1, wherein the ethylene-based resin composition is obtained by adding an ethylene polymer to the ethylene-based resin composition in an amount of 1 to 35% by weight. 7. The agricultural film according to claim 6, wherein the ethylene polymer is a high-pressure low-density polyethylene.