ES2348935T3 - AGRICULTURAL FILM. - Google Patents

Abstract

An agricultural film comprising a first layer and a second layer, the first layer being a layer comprising a thermoplastic resin and constitutes a surface of the film, the second layer being a layer that is adjacent to the first layer comprising a component ( A), a component (B) and a component (C) each defined below, where in the second layer the content of component (B) is 20 to 900 parts by weight per 100 parts by weight of component (A) , the content of component (C) is from 0.01 to 5% of the combined weight of components (A), (B) and (C): component (A): an ethylene / α-olefin copolymer comprising units Structural obtained from ethylene and structural units obtained from an α-oleophin that has 3 to 20 carbon atoms and has a melt flow rate of 0.01 to 5 g / 10 min, measured at a temperature of 190 ° C and a load of 21.18 N according to method A provided in JIS K7210-1995, and one energ Flow activation path (Ea) from 60 kJ / mol to 100 kJ / mol, as defined by the equation (log (aT) = Ea / R (1 / T-1 / T0), where R is the gas constant and T0 is the standard temperature of 189.94 ° C (463 ° K) and aT is the transfer factor as defined in the specification. component (B): an ethylene / vinyl acetate copolymer comprising structural units obtained from ethylene and structural units obtained from vinyl acetate and having a melt flow rate of 0.01 to 5 g / 10 min, measured at a temperature of 90 ° C and a load of 21.18 N according to method A provided in JIS K7210-1995 and a content of structural units obtained from vinyl acetate from 3 to 20% by weight; component (C): a non-ionic surfactant.

Description

The present invention relates to agricultural films that can be suitably used to cover houses, agricultural tunnels and the like.

Plastic films that are used to cover houses, agricultural tunnels and the like are called "agricultural films." As such agricultural films, polyvinyl chloride films, polyolefin resin films, such as polyethylene films and ethylene / vinyl acetate copolymer films are widely used. The properties that agricultural films must have to exert an improvement in the good growth of crops include transparency, anti-drip properties, etc.

JP-A2001-334612 describes a multilayer film comprising a first layer of an ethylene / α-olefin copolymer, a third layer of an ethylene / vinyl acetate copolymer and a second layer composed of an ethylene / acetate copolymer of vinyl and an ethylene / α-olefin copolymer, the second layer being disposed between the first layer and the third layer, where at least the third layer contains a surfactant. It was revealed that this multilayer film can be suitably used as a coating film in agricultural facilities.

However, the transparency of the multilayer film may deteriorate over time due to the appearance of crystallization of the surfactant on the surface of the film or anti-drip properties may be lost in a short period of time.

An object of the present invention is to provide agricultural films with excellent durability of transparency and anti-drip properties.

In another aspect, the present invention relates to an agricultural film comprising a first layer and a second layer, the first layer being a layer containing a thermoplastic resin and constituting a surface of the film, the second layer being a layer that it is an adjacent to the first layer and comprising a component (A), a component (B) and a component (C), each of which is defined below, where in the second layer the content of the component (B) is 20 to 900 parts by weight per 100 parts by weight of component (A), the content of the component

(C) is 0.01 to 5% of the combined weight of components (A), (B) and (C): component (A): an ethylene / α-olefin copolymer comprising structural units obtained from ethylene and structural units obtained from an α-olefin having 3 to 20 carbon atoms and having a melt flow rate of 0.01 to 5 g / 10 min and a flow activation energy of 60 to 100 KJ / mol; component (B): an ethylene / vinyl acetate copolymer comprising structural units obtained from ethylene and structural units obtained from vinyl acetate and a melt flow rate of 0.01 to 5 g / 10 min and a content of structural units obtained 3 to 20% by weight vinyl acetate; component (C): a non-ionic surfactant. The agricultural film of the present invention is a film that includes

a first layer and a second layer, the first layer being the one comprising a thermoplastic resin and constituting a surface of the film, the second layer being a layer that is adjacent to the first layer and comprising a component (A), a component (B) and a component (C), each of which is defined below, where the second layer the content of component (B) is 20 to 900 parts by weight for every 200 parts by weight of component (A) , the content of component (C) is 0.01 to 5% of the combined weight of components (A), (B) and (C):

component (A): an ethylene / α-olefin copolymer comprising structural units obtained from ethylene and structural units obtained from an α-olefin having 3 to 20 carbon atoms and having a melt flow rate of 0.01 a 5 g / 10 min and a flow activation energy of 60 to 100 KJ / mol; component (B): an ethylene / vinyl acetate copolymer comprising structural units obtained from ethylene and structural units obtained from vinyl acetate and a melt flow rate of 0.01 to 5 g / 10 min and a content of structural units obtained 3 to 20% by weight vinyl acetate; component (C): a non-ionic surfactant. Component (A) is an ethylene / α-olefin copolymer comprising

structural units obtained from ethylene and structural units obtained from an α-olefin having 3 to 20 carbon atoms. That is, component (A) is a copolymer produced by copolymerization of ethylene and at least one α-olefin selected from the α-olefins having 3 to 20 carbon atoms.

In the ethylene / α-olefin copolymer in the form of component (A), the content of the structural units obtained from ethylene is 50 to 99% by weight.

Examples of α-olefins having 3 to 20 carbon atoms include propylene, 1-butene, 4-methyl-1-pentene, 1-hexene, 1-octene and 1-decene. 1-Butene, 4-methyl-1-pentene and 1-hexene are preferred. The copolymer of component (A) may include two or more α-olefins. Such combinations of α-olefins include a combination of 1-butene and 4-methyl-1-pentene, a combination of 1-butene and 1-hexene, a combination of 1-butene and 1-octene, and a combination of 1-butene and 1-dean. Particularly preferred combinations are a combination of 1-butene and 4-methyl-1pentene and a combination of 1-butene and 1-hexene.

Examples of preferred ethylene / α-olefin copolymers as component (A) include copolymers of ethylene and an α-olefin having 5 to 10 carbon atoms and copolymers of ethylene, 1-butene and an αolefin having 5 to 10 carbon atoms. Particularly preferred are copolymers of ethylene and an α-olefin having 6 to 10 carbon atoms and copolymers of ethylene, 1-butene and an α-olefin having 6 to 10 carbon atoms.

The ethylene / α-olefin copolymer as component (A) has a flow activation energy (Ea) of 60 to 100 kJ / mol. When the ethylene / α-olefin copolymer constituting a layer containing a non-ionic surfactant has a flow activation energy of less than 60 kJ / mol, the film is poor in durability and anti-drip properties. Furthermore, from the point of view of impact resistance and transparency, the Ea of the ethylene / α-olefin copolymer is not more than 100 kJ / mol and preferably is not more than 90 kJ / mol.

The flow activation energy (Ea) of an ethylene / αolefin copolymer is a value calculated from the following Arrhenius type equation with respect to the displacement factor (aT) in the production of a main curve indicating the degree of dependence of dynamic viscoelasticity (η in Pa · s) at 190 ° C on the velocity of deformation by displacement of dynamic viscoelasticity data according to the principle of temperature-time overlap, where the data is measured in conditions (1) to ( 4) indicated below at individual temperatures T (K) using a viscoelasticity measuring instrument, Rheometrics Mechanical Spectrometer RMS-800 available from Rheometrics. Conditions for measuring dynamic viscoelasticity data at individual temperatures T (K)

(one)

Geometry: parallel plates; diameter: 25 mm, distance between the plates: 1.5 to 2 mm

(2)

 Tension: 5%

(3)

 Warp speed: 0.1 to 100 rad / s

(4)

 Temperature: 190ºC, 170ºC, 150ºC, 130ºC

In the samples, an appropriate amount (for example, 1000 ppm or more) of an antioxidant (for example, Irganox 1076 available from Ciba Specialty Chemicals) is added. The measurement is performed in a nitrogen atmosphere.

Arrhenius type equation of displacement factor (aT)

image 1

where R is the gas constant and T0 is a conventional temperature (189.94 ° C (463 ° K)).

Rhios V.4.4.4 produced by Rheometrics was used as calculation software. A value of Ea calculated when the correlation factor r2 obtained in the linear approximation is 0.99 or more in the graphical representation of the Arrhenius type, log (aT) - (1 / T), is used as the flow activation energy of the ethylene / α-olefin copolymer.

The melt flow rate (MFR) of the ethylene / α-olefin copolymer, measured at a temperature of 190 ° C and a load of 21.18 N in method A provided in JIS K7210-1995, is within the range of 0, 01 to 5 g / 10 min, and preferably 0.1 to 50 g / 10 min.

From the viewpoint of transparency and film strength, the molecular weight distribution (Pm / Mn) of the ethylene / α-olefin copolymer of component (A) is preferably in the range of 5 to 25 and more preferably from 5.5 to 20. The molecular weight distribution (Pm / Mn) is a value obtained by determining a weight average molecular weight (Pm) and a number average molecular weight (Mn) by gel permeation chromatography using polystyrene in form of a standard substance, and then dividing Pm by Mn.

From the point of view of transparency, strength and dust resistance properties of the film, the ethylene / α-olefin copolymer of component (A) preferably satisfies the following formula (1): in which MFR is a melt flow rate (unit: g / 10 min) measured at a temperature of

5 190 ° C and at a load of 21.18 N according to JIS K7210 and MT is a melting voltage (unit: cN) at 190 ° C. image 1

The melting stress MT in the formula (1) is determined as follows: by using a melting stress meter available in, for example, Toyo Seiki Seisaku-Sho, Ltd., a molten resin is extruded through a hole (2.09 mm in diameter and 8 mm in length) with a piston at 190 ° C moving at a speed of 5.5 mm / min to form a thread and the thread is wound around a roller of 50 mm in diameter while increasing the speed of rotation of the roller at a speed of 40 rpm / min.

15 The value of the tension shown by the wire just before breaking is considered as melting tension MT in formula (1). From the viewpoint of moldability, the ethylene / α olefin copolymer of component (A) preferably satisfies a ratio represented by the following formula (2), more preferably the formula (2 ') and

20 even more preferably the formula (2 "), in which [η] and MFR represent the intrinsic viscosity (unit: dl / g) and the melt flow rate (unit: g / 10 min), which has been described above, of the copolymer, respectively.

image 1

Intrinsic viscosity [η] in formulas (2), (2 ') and (2 ") is determined

25 as follows. A 100 mg portion of an ethylene / α-olefin copolymer is dissolved at 135 ° C in 100 ml of Tetralin containing 5% by weight of butylhydroxytoluene (BHT) as a heat degradation inhibitor to produce a sample solution. The relative viscosity [ηrel] at 135 ° C is calculated from the drop times of the sample solution and a white solution using a Ubbelohde viscometer. Then, the intrinsic viscosity is calculated from the formula given below. The white solution is Tetralin that contains 5% by weight of BHT as a heat degradation inhibitor. image 1

The MFR (unit: g / 10 min) in the formulas (2), (2 ') and (2 ") is the same as the MFR in the formula (1).

From the point of view of the balance between stiffness and impact resistance of the film, the density of the ethylene / α-olefin copolymer of component (A) measured by the method provided in JIS K6760-1981, is typically between 890 and 950 kg / m3, preferably between 900 and 930 kg / m3 and even more preferably between 905 and 925 kg / m3.

The ethylene / α-olefin copolymer of component (A) can be produced by copolymerization of ethylene and α-olefin in the presence of a metallocene catalyst described below and hydrogen. The metallocene catalyst is a catalyst that is obtained by contacting a co-catalyst support, a crosslinked bisindenylcirconium complex and an organoaluminum compound. The co-catalyst support is obtained by contacting diethylcinc, fluorinated phenol, water, silica and trimethyldisilazane ((((CH3) 3Si) 2NH).

The amounts of diethyl zinc, fluorinated phenol and water used are not particularly restrictive. When the amounts of these substances used are expressed in a molar ratio of diethyl zinc: fluorinated phenol: water = 1: p: q, it is preferable that p and q satisfy the following formula (3).

image 1

In formula (3), p is a number that is preferably between 0.01 and 1.99, more preferably between 0.10 and 1.80, even more preferably between 0.20 and 1.50 and much more preferably than between 0.30 and 1.00.

With respect to the amount of silica that is used based on the amount of diethyl zinc used, the amount of zinc atoms obtained from the diethyl zinc contained in the particles obtained from contacting the diethyl zinc with the silica is preferably 0.1 mmol or more. , more preferably between 0.5 and 20 mmol in terms of the number of moles of zinc atoms contained in 1 gram of particles. Therefore, accordingly, the amount of silica is adequately determined. As for the amount of trimethylsilazane used based on the amount of silica used, the amount of trimethylsilazane is preferably 0.1 mmol or more, more preferably between 0.5 and 20 mmol per gram of silica.

Preferable examples of reticular bisindenylcirconium complex include racemic ethylenebis (1-indenyl) zirconium dihydrochloride and racemic ethylene bis (1-indenyl) zirconium diphenoxide. Preferable examples of the organoaluminum compound include triisobutylaluminum and tri-noctylaluminum.

The amount of crosslinked bisindenylcirconium complex used is preferably 5 x 10-6 to 5 x 10-4 mol per gram of the cocatalyst support. The amount of the organoaluminum compound used is preferably between 1 and 2000 in terms of the proportion (Al / Zr) of the molar number of aluminum atoms in the organoaluminum compound with the molar number of zirconium atoms in the bisindenylcirconium type complexes reticulate

The polymerization method is a polymerization method accompanied by the formation of ethylene / α-olefin copolymer particles, for example, gas phase polymerization, suspension polymerization or mass polymerization. Gaseous phase polymerization is preferred.

Possible methods for supplying the components of the metallocene catalyst used in the production of the ethylene / α-olefin copolymer of component (A) to a reactor include a method in which the components are supplied using an inert gas such as nitrogen and argon. hydrogen hydrogen

or the like in water-free conditions, and a method in which the components are dissolved or diluted in a solvent and supplied in the form of a solution or a suspension. The catalyst components can be supplied separately, or any of the components can be previously contacted in any order before being supplied. It is preferable that the preliminary polymerization is carried out before the main polymerization is carried out and that the preliminary polymerized catalyst components are used as components or catalysts for the main polymerization.

The polymerization temperature is typically lower than the temperature at which the resulting copolymer melts. It is preferably between 0 and 150 ° C and more preferably between 30 and 100 ° C. In order to control the melt flow of the polymer, hydrogen can be added as a molecular weight control agent. An inert gas can coexist in a mixed gas.

The ethylene / vinyl acetate copolymer (component (B)) contained in the second layer is an ethylene / vinyl acetate copolymer comprising structural units obtained from ethylene and structural units obtained from vinyl acetate and has a structural unit content obtained from vinyl acetate from 3 to 20% by weight;

The ethylene / vinyl acetate copolymer of component (B) has a melt flow rate (MFR) of 0.01 to 5 g / 10 min. The MFR is measured at a temperature of 190 ° C and a load of 21.18 N by the method provided in JIS K7210-1995. The ethylene / vinyl acetate copolymer of component (B) is produced by polymerizing ethylene and vinyl acetate by a conventional polymerization method using a conventional olefin polymerization catalyst. For example, bulk polymerization, solution polymerization and the like can be used using radical initiators.

Examples of the nonionic surfactant of component (C) include sorbitan-based surfactants, such as sorbitan fatty acid esters, for example sorbitan monopalmitate, sorbitan monostearate, sorbitan monomontanate, sorbitan monooleate and sorbitan dioleate, and their alkylene oxide adducts; glycerol-based, such as fatty acid esters of glycerol, for monopalmitate example glycerol monostearate, glycerol distearate, diglycerol, triglycerol monostearate, dimontanate tetraglycerol monooleate glycol monooleate, diglycerol sesquioleate diglycerol monooleate surfactants tetraglycerol, hexaglycerol monooleate, hexaglycerol trioleate, tetraglycerol trioleate, tetraglycerol monolaurate and hexaglycerol monolaurate and its alkylene oxide adducts; polyethylene glycol based surfactants, such as polyethylene glycol monopalmitate and polyethylene glycol monostearate; alkylene oxide adducts of alkylphenols; sorbitan / glycerol esters condensed with organic acids; polyoxyethylene alkylamines, such as polyoxyethylene stearylamine (2 mol), polyoxyethylene stearylamine (4 mol), polyoxyethylene stearylamine monostearate (2 mol), polyoxyethylene laurylamine monostearate (4 mol) and its fatty acid esters. These may be used alone or together with two or more thereof.

The second layer of the agricultural film of the present invention includes the aforementioned ethylene / α-olefin copolymer (component (A)), the ethylene / vinyl acetate copolymer (component (B)) and the non-surfactant ionic (component (C)) and, in particular, the content of component (B) is 20 to 900 parts by weight per 100 parts by weight of component (A) and the content of component (C) is 0, 01 to 5% of the combined weight of the components (A), (B) and (C). If the content of component (A) is too low (in other words, the content of component (B) is too high), the film will have a reduced resistance. The content of component (B) is preferably less than 400 parts by weight per 100 parts by weight of component (A). If the content of component (A) is too high (in other words, the content of component (B) is too low), the film will be poor in its anti-drip properties. The content of component (B) is preferably not less than 25 parts by weight, more preferably not less than 33 parts by weight, per 100 parts by weight of component (A). The content of component (C) is preferably within the range of 0.1 to 4% of the combined weight of components (A), (B) and (C). By setting the content of the component (C) within the previous range, it is possible to provide a film with excellent anti-drip properties and it is also possible to control the deterioration of the transparency because the component (C) is spread on the surface of the film . For a film to show anti-drip properties caused by the action of an anti-drip agent, the anti-drip agent must be spread on the surface of the film. However, if a large amount of anti-drip agent is spread at an initial stage of use, the transparency of the film may deteriorate and the film cannot maintain its anti-drip properties for a long period of time. Since the agricultural film of the present invention allows slowly extending the component (C), in an amount sufficient to show anti-drip properties, on the surface of the film for a long period of time, the transparency of the film is not deteriorates and the film has an excellent

Durability of its anti-drip properties.

The agricultural film of the present invention includes at least two layers that include the second layer described above and the first layer containing a thermoplastic resin. The thermoplastic resin contained in the first layer, which is not particularly limited, is preferably an olefin based resin. Examples of said olefin-based resin include α-olefin homopolymers, such as polyethylene and polypropylene; ethylene / α-olefins copolymers, such as ethylene / propylene copolymers, ethylene / 1-butene copolymers, ethylene / 4-methyl-1-pentene copolymers, ethylene / 1-hexene copolymers and ethylene / 1- copolymers octene; α-olefin copolymers as the main component and other types of monomers, such as ethylene / vinyl acetate copolymers, ethylene / acrylic acid copolymers, ethylene / methyl methacrylate copolymers, ethylene / vinyl acetate / methacrylate copolymers methyl and monomer resins: olefin copolymers and aromatic monomers containing a vinyl group, such as ethylene / styrene copolymers; and olefin copolymers and cyclic monomers, such as ethylene / norbornene copolymers and ethylene / styrene / norbornene copolymers.

From the point of view of the durability of the anti-drip and anti-fogging properties and the strength of the film, it is desirable that the first layer comprises a component (A), a component (B), a component (C) and a component (D), each defined below, where in the first layer the content of component (B) is 20 to 900 parts by weight per 100 parts by weight of component (A), the content of component (C ) is 0.01 to 5% of the combined weight of components (A), (B), (C) and (D), and the content of component (D) is 0.01 to 3% of the combined weight of the components (A), (B), (C) and (D):

component (A): an ethylene / α-olefin copolymer comprising

structural units obtained from ethylene and structural units

obtained from an α-olefin having 3 to 20 carbon atoms and

It has a melt flow rate of 0.01 to 5 g / 10 min and an energy of

flow activation from 60 to 100 kJ / mol;

component (B): an ethylene / vinyl acetate copolymer that

It includes structural units obtained from ethylene and units

Structural obtained from vinyl acetate and has a melt flow rate of 0.01 to 5 g / 10 min and a content of the structural units

obtained from vinyl acetate from 3 to 20% by weight;

component (C): a non-ionic surfactant.

component (D): a fluorine-containing surfactant, a

silicone-based surfactant or a mixture of a surfactant

which contains fluorine and a silicone based surfactant.

Component (A), component (B) and component (C) contained in the first layer are the same as component (A), component (B) and component (C) contained in the second layer that has been explained above. Examples of fluorine-containing surfactants of component (D) include fluorine-containing compounds having a perfluoroalkyl group, a ω-hydrofluoroalkyl group, etc. Examples of the silicone based surfactant include silicone compounds having an alkylsiloxane group. Specific examples of fluorine-containing surfactants include Unidyne DS-403, DS-406, DS-401 (trade names) available from Daikin Industries, LTD., And Surflon KC-40 (trade name) available from SEIMI CHEMICAL Co., Ltd. Silicone-based surfactants include SH-3746 (trade name) available from Toray Dow Corning Silicone Co. These may be used alone or together with two or more thereof. The component (D) is spread on a surface of the film to function as an anti-fogging agent. In the first layer, the content of component (D) is preferably 0.01 to 3%, more preferably 0.02 to 2% and even more preferably 0.05 to 1% of the combined weight of the components (A ), (B), (C) and (D).

In the case where the first layer is a layer containing the components mentioned above (A), (B), (C) and (D), when the film is used as the lining material of an agricultural installation (for example house, tunnel, etc.), it will be desirable to extend the film so that the first layer faces the interior of the installation.

When the content of the component (A) in the first layer, VA1, and the content of the component (A) in the second layer, VA2 satisfies the ratio VA1 <VA2, the agricultural film has excellent transparency. On the other hand, when VA1> VA2, the film has excellent durability of its anti-drip properties.

The agricultural film of the present invention may include a layer or layers other than the first and second layers described above. Each layer or layers other than the first and second layers may be a layer comprising a thermoplastic resin, preferably an olefin based resin. When the agricultural film of the present invention includes three or more layers, its layer constitution may be layer q of type p (when p is q, p is an integer of 2 or more, q is an integer of 3 or more ), for example layer 3 of type 2, layer 3 of type 3, layer 4 of type 2, layer 4 of type 3, layer 4 of type 4, layer 5 of type 2, layer 5 of type 3, layer 5 of type 4, layer 5 of type 5, layer 6 of type 2, layer 6 of type 3, layer 6 of type 4, layer 6 of type 5 and layer 6 of type 6. (P ≤ Q and Pson two or more and Q is three

or more natural numbers). When the agricultural film of the present invention includes three or more layers, it is desirable that both the first layer and the third layer containing a thermoplastic resin be the outermost layers. That is, the second layer is preferably located between the second layer and the third layer. When two or more layers of the same composition are adjacent to each other, these layers are considered a single layer.

From the point of view of the strength of the film, the thickness of the agricultural film of the present invention is desirably 0.01 mm or more. Additionally, from the point of view of the ease of film extension work, the thickness of the film is preferably 0.3 mm

or lower, and more preferably it is in the range of 0.03 to 0.25 mm.

The agricultural film of the present invention may contain conventional additives, if necessary. Examples of additives include antioxidants, light stabilizers, UV absorbers, anti-fogging agents, anti-opacity agents, lubricants, anti-blocking agents, antistatic agents, pigments and inorganic fillers.

Examples of antioxidants include phenol compounds with steric hindrances, such as 2,6-dialkylphenol derivatives and 2-alkylphenol derivatives, and phosphorus-containing ester compounds, which contain a trivalent phosphorus atom, such as phosphite compounds and phosphonite compounds Such antioxidants can be used alone or together with two or more thereof. Particularly, from the standpoint of color stability, the use of a phenol compound with steric hindrances in combination with a phosphorus-containing ester compound is preferred. Each layer preferably contains an amount of 0.03 to 1% by weight and more preferably 0.03 to 0.5% by weight of antioxidants.

Examples of light stabilizers include sterically hindered amine compounds having a structure described in JP-A 8-73667. Specific examples are Tinuvin 622-LD, Chimassorb 944-LD (available from Ciba Specialty Chemicals), Hostavin N30, VP Sanduvor PR-31 (available from Clariant, Ltd.) and Cyasorb UV3529, Cyasorb UV3346 (available from Cytec Industries Inc. ). Additional examples include steric hindrance amine ether compounds having a structure described in JP-A 11-315067. Specific examples include Tinuvin NOR371 (available from Ciba Specialty Chemicals). The content of a light stabilizer in each layer is preferably between 0.01 and 3% by weight, more preferably 0.05 to 2% by weight and even more preferably 0.1 to 1% by weight.

Examples of UV absorbers include benzophenone UV absorbers, benzotriazole UV absorbers, benzoate UV absorbers and cyanoacrylate UV absorbers. These may be used alone or together with two or more thereof. From the point of view of the effect exerted by weather resistance and the extension of the component on the surface of the film, the content of a UV absorber in each layer is preferably from 0.01 to 3% by weight and more preferably from 0.03 to 2% by weight.

Inorganic fillers include complex hydroxides, such as hydrotalcite compounds and complex lithium aluminum hydroxides. Examples of hydrotalcite compounds include natural hydrotalcite and synthetic hydrotalcites such as DHT-4A (trade name, available from Kyowa Chemical Industry Co., Ltd.) and Magcrysta (available from Kyowa Chemical Industry Co., Ltd.). Specific examples of complex lithium aluminum hydroxides include Mizukalac (available from Mizusawa Industrial Chemicals), Ltd.) and Fujirein (available from Fuji Chemical Industry Co., Ltd.). Additional examples include metal oxides, such as manganese oxide, calcium oxide, aluminum oxide, silicon oxide and titanium oxide; hydroxides, manganese hydroxide, calcium hydroxide and aluminum hydroxide; carbonates, such as magnesium carbonate and calcium carbonate; sulfates, such as potassium sulfate, magnesium sulfate, calcium sulfate, zinc sulfate and aluminum sulfate; phosphates, such as lithium phosphate, sodium phosphate, potassium phosphate, calcium phosphate and zirconium phosphate (for example, type H zirconium phosphate described in JP-A 8-67774); silicates, such as magnesium silicate, calcium silicate, aluminum silicate and titanium silicate; aluminates, such as sodium aluminate, potassium aluminate and calcium aluminate; aluminosilicates, such as sodium aluminosilicate, potassium aluminosilicate and calcium aluminosilicate; clay minerals, such as kaolin, clay and talc; and other complex oxides.

The method of producing the agricultural film of the present invention is not particularly limited. It can be produced by a method of forming a laminated film, for example a method of tubular film coextrusion, T-matrix coextrusion casting, extrusion lamination and dry lamination. It is desirable to produce the film by the method of coextrusion of tubular film. When the agricultural film is produced by the method of coextrusion of tubular film, it is desirable to place the first layer on the outside of the tube. When a film is produced by the tubular method, an extruded tubular film is provided through a blow matrix with a cutting line so that the tubular film can be opened when it is extended. Then, the tubular film is rolled. In the state in which the film has been rolled, the inner layer of the tubular film is in contact with the inner layer itself. When the film is spread over the structures of the agricultural facilities to form an agricultural facility, a tubular roll film is unwound and extends along the cutting line. After this, it extends over the structures of the agricultural facility. In view of the operability in the extension of the film, it is desirable to place the first layer on the outside of the tube.

The agricultural film of the present invention is used as a coating film for agricultural and horticultural facilities, such as greenhouses, tunnels or the like. In particular, the agricultural film of the present invention is used by extending it so that its first layer looks into the interior of the agricultural installation. EXAMPLES

The examples of the present invention are shown below, but the invention is not limited thereto. The test methods used in the Examples and in the Comparative Examples are as indicated below.

(one)

 Transparency test (Turbidity)

Turbidity (%) was measured with a direct read turbidity computer HGM-2DP; Light source C (available from Suga Test Instruments Co., Ltd.) in accordance with JIS K7105.

(2)

Calculation of the durability of transparency (Δ Turbidity)

The turbidity of a film was measured just after its manufacture and its turbidity after a month of storage at a temperature of 30 ° C and a relative humidity RH of 80%. Then, the difference between the two turbidity measures was calculated.

(3)

 Evidence of anti-fogging properties and its durability

A film with a double-sided adhesive tape was attached to an acrylic structure 34 cm long and 5 cm wide, and placed with the surface of the first layer face down and with a 15 degree inclination to the horizontal plane on a bath of constant temperature water located in a room of constant temperature environmental test. The temperature conditions of (environmental test room / constant temperature water bath) in the test were -3 ° C / 20 ° C in a "low temperature test" and 23 ° C / 40 ° C in a "high temperature test". Three months and seven days later, the state of the drops of water on the surface of the film was observed and the results were determined according to the following criteria:

A: The surface of the film is uniformly wet;

B: water droplets partially adhere to the surface of the film; Y

C: water droplets adhere to the entire surface and the film seems fogged.

(4) Tensile strength at break

Test tubes in the form of a JIS type 1 lever were subjected to a tensile test using an Autograph DSS100 (manufactured by Shimadzu Corporation). The mean tensile strength at break (in MPa) in the MD and in the TD (in MPa) was recorded as the tensile strength at break in the film.

Resins A1 and A2 corresponding to component (A) in the second layer were produced by the following methods. (Production method of A1)

(1) Preparation of a Co-catalyst Support

A solid product (hereinafter referred to as cocatalyst support (a)) was prepared in the same manner as in the preparation of component (A) described in Example 10 (1) and (2) of JP-A 2003171415 In particular, the following preparation steps were performed. (1-1) Silica Treatment

203 g of silica (Sylopol 948 manufactured by Davison Co., Ltd .; mean particle diameter = 61 μm; porosity = 1.70 ml / g; area were charged in a four-liter, 3-liter flask purged with nitrogen; specific surface = 291 m2 / g) that had been heat treated at 300 ° C in a nitrogen flow. Then, 1.2 liters of toluene was introduced thereto while washing the adhered silica to the inner walls of the flask. After cooling to 5 ° C, a mixed solution of 84.4 ml of 1,1,1,3,3,3 hexamethyldisilazane and 115 ml of toluene was added dropwise thereto for 25 minutes. After the drip was completed, the resulting mixture was stirred at 5 ° C for 1 h and additionally at 95 ° C for 3 h and then filtered. The residue was washed four times at 95 ° C on a filter with 1.2 liters of toluene. After this, 1.2 liters of toluene was added and then allowed to stand overnight. (1 -2) Synthesis of component (A)

To the suspension obtained above, 0.550 liters (1.10 mol) of a solution of hexane and diethyl zinc (2.00 mol / liter) was added and the mixture was cooled to 5 ° C. To the mixture was added dropwise a solution prepared by dissolving 105 g (0.570 mol) of pentafluorophenol in 173 ml of toluene for 65 minutes. After the drip was completed, the mixture was stirred at 5 ° C for 1 hour, then heated to 40 ° C and stirred for 1

h. Subsequently, the temperature was lowered to 5 ° C in an ice bath and then 14.9 g (0.828 mol) of H2O was added dropwise over 90 minutes. After the drip was completed, the mixture was stirred at 5 ° C for 1.5 h and then at 40 ° C for 2 h. After this, the resulting mixture was allowed to stand at room temperature overnight. After this, the mixture was stirred at 80 ° C for 2 hours and then allowed to stand to precipitate a solid component. When an interface was observed between a layer of the precipitated solid component and an upper layer of the suspension, the upper layer of the suspension was removed and then the remaining liquid component was filtered. Then, 1.7 liters of toluene was added and the mixture was stirred at 95 ° C for 2 h. After this, the mixture was stirred four times at 95 ° C in 1.7 liters of toluene, twice at room temperature in 1.7 liters of hexane and then allowed to stand so that the solid component precipitated. When an interface was observed between a layer of the precipitated solid component and an upper layer of the suspension, the upper layer of the suspension was removed and then the remaining liquid component was subjected to filtration washing. Then, the resulting solid component was dried under reduced pressure at room temperature for 3 hours, giving 386 g of component (A). Elemental analysis revealed that Zn = 2.4 mmol / g and F = 6.8 mmol / g.

(2)

 Preliminary Polymerization

A nitrogen purged autoclave having a capacity of 210 liters equipped with an agitator was loaded with 0.63 kg of the cocatalyst support (a), 80 liters of butane, 0.03 kg of 1-butane and 11 liters of hydrogen at normal temperature and normal pressure, and then the autoclave was heated to 40 ° C. In addition, ethylene was charged in an amount corresponding to 0.21 MPa of gas phase pressure in the autoclave, and after stabilization of the system, 208 mmol of triisobutylaluminum and 70 mmol of ethylenebis (1-indenyl) diphenoxide were added racemic zirconium at the start polymerization. The mixture was heated to 49 ° C and then preliminary polymerization was carried out at 49 ° C for a total of 4 hours while ethylene and hydrogen were continuously supplied. After the polymerization was completed, ethylene, butane, hydrogen gas and the like were purged and the remaining solid dried under vacuum at room temperature to achieve a catalyst component (hereinafter referred to as a prepolymerized catalyst component (a- 1)) in which 14.1 g of the ethylene / 1-butane copolymer have been produced per gram of the co-catalyst support (a).

(3)

 Continuous gas phase polymerization

Using the pre-polymerized catalyst component (a-1), the copolymerization of ethylene and 1-hexane was performed in a gas-type polymerization apparatus of a continuous fluidized bed. The polymerization conditions included a temperature of 75.6 ° C, a total pressure of 2 MPa, a linear gas velocity of 0.36 m / s, a mole ratio of hydrogen to ethylene of 0.67% and a mole ratio of 1-hexane with respect to 1.38% ethylene, and during polymerization, ethylene, 1-hexane and hydrogen were continuously supplied to keep the gas composition constant. In addition, the pre-polymerized catalyst component (a-1) and triisobutylaluminum were continuously supplied at constant rates to maintain the total powder weight in a fluidized bed at 80 kg and adjust the average polymerization time to 3.8 h. By polymerization, a powder of the ethylene / 1-hexane copolymer (hereinafter referred to as PEA1) was obtained at a production yield of 20.9 kg / h.

(4)

 Granulation of Ethylene / 1-Hexane Copolymer Powder

A mixture of the PE-A1 powder and 750 ppm of an antioxidant (SUMILIZER GP, produced by Sumitomo Chemical, Co., Ltd.) was granulated at a delivery rate of 50 kg / h, a screw speed of 450 rpm, a 50% gate opening, a suction pressure of 0.2 MPa and a resin temperature of 200 ° C to 230 ° C using an extruder (LCM50 produced by Kobe Steel, Ltd.). Therefore, the granules of A1 were obtained. The basic properties of A1 are shown in Table 2. (Production Method of A2)

(one)

 Co-catalyst Support Preparation

In the preparation of resin A2, the co-catalyst support (a) was used, which was used in the production of resin A1.

(2)

 Preliminary Polymerization

A nitrogen purged autoclave having a capacity of 210 liters equipped with an agitator was loaded with 0.70 kg of the cocatalyst support (a), 80 liters of butane, 0.02 kg of 1-butane and 11 liters of hydrogen at normal temperature and normal pressure, and then the autoclave was heated to 41 ° C. In addition, ethylene was charged in an amount corresponding to 0.21 MPa of the gas phase pressure in the autoclave, and after stabilization of the system, 312 mmol of triisobutylaluminum and 105 mmol of ethylenenebis (1-indenyl diphenoxide) were added ) racemic zirconium to initiate polymerization. The mixture was heated to 50 ° C, then preliminary polymerization was performed at 50 ° C for a total time of 4 hours while ethylene and hydrogen were continuously supplied. After completion of the polymerization, ethylene, butane, hydrogen gas and the like were purged and the remaining solid dried under vacuum at room temperature to achieve a catalyst component (hereinafter referred to as a prepolymerized catalyst component (a- 2)) in which 12.8 g of the ethylene / 1-butane copolymer have been produced per gram of the cocatalyst support (a).

(3)

 Continuous gas phase polymerization

Using the pre-polymerized catalyst component (a-2), the copolymerization of ethylene and 1-hexane was performed in a gas-type polymerization apparatus of a continuous fluidized bed. The polymerization conditions included a temperature of 74.5 ° C, a total pressure of 2 MPa, a linear gas velocity of 0.28 m / s, a mole ratio of hydrogen to ethylene of 0.60% and a mole ratio of hexane with respect to 0.75% ethylene, and during polymerization, ethylene, 1-hexane and hydrogen were continuously supplied to keep the gas composition constant. In addition, the prepolymerized catalyst component (a-2) and triisobutylaluminum were continuously supplied at constant rates to maintain the weight of the total powder in the fluidized bed at 80 kg and adjust the average polymerization time to 4.1 h. By polymerization, a powder of the ethylene / 1-hexane copolymer (hereinafter referred to as PE-A2) was obtained at a production yield of 19.4 kg / h.

(4)

 Granulation of Ethylene / 1-Hexane Copolymer Powder

A mixture of the PE-A2 and 750 ppm powder of an antioxidant (SUMILIZER GP, produced by Sumitomo Chemical, Co., Ltd.) was granulated at a delivery rate of 50 kg / h, a screw speed of 450 rpm, a 50% gate opening, a suction pressure of 0.2 MPa and a resin temperature of 200 ° C to 230 ° C using an extruder (LCM50 produced by Kobe Steel, Ltd.). Therefore, the granules of A2 were obtained. The basic properties of A2 are shown in Table 1.

The basic properties of resins A1 and A2 and the component (A) used in the Comparative Examples are shown in Table 1. Tables, A3 and A4 are the following resins.

A3: SUMIKATHENE E FV402 produced by Sumitomo Chemical Co., Ltd. (ethylene / 1-hexane copolymer). A4: SUMIKATHENE E FV401 produced by Sumitomo Chemical Co., Ltd. (ethylene / 1-hexane copolymer).

Table 1

Resin code

A1 A2 A3 A4

MFR 190 ° C, 2,180 N

g / 10 min 0.6 0.4 3.5 3.6

MFRR

- 117 109 17.6 19.0

Density

Kg / m3 919 910 912 904

Flow activation energy (Ea)

kJ / mol 67.4 72.8 33.9 31.0

Molecular Weight Distribution (Pm / Mn)

- 7.9 6.1 2.5 2.2

Fusion Tension (MT)

cN 4.3 5.4 0.4 0.3

(Left side of Formula (1)) 2 x MFR-0.59

- 2.7 3.4 1.0 0.9

(Right side of Formula (1)) 20 x MFR-0.59

27.0 34.3 9.6 9.4

Intrinsic viscosity [η]

Dl / g 1.16 1.13 1.26 1.26

(Left side of Formula (2)) 1.02 x MFR0.094

- 1.07 1.11 0.91 0.90

(Right side of Formula (1)) 1.05 x MFR0.156

- 1.62 1.73 1.23 1.23

[Example 1] The components were weighed so that their contents were converted to resin A1: 97.35% by weight, thermal stabilizer E1: 0.05%

5 by weight, erosion agent H1: 0.5% by weight, UV absorber G1 0.24% by weight, lubricant K1 0.06% by weight, lubricant K2: 0.2% by weight, drip agent H1: 0 , 5% by weight and anti-drip agent H2: 0.8% by weight. Hereinafter, they were mixed with a 5-L Banbury mixer at 150 ° C for 5 minutes and then granulated with a granulator. Therefore, it

10 obtained granules for a third layer. Similarly, the components to be contained in the second layer and in the first layer were weighed, respectively, followed by kneading with a 5-L Banbury mixer at 150 ° C for 5 minutes and granulated with a granulator. Thus, granules were obtained for the second layer and those of the first layer. Using a three-layer inflation molding machine (circular die diameter: 100 mm; flange gap: 1.2 mm) equipped with 40 mm extruders for the individual layers, the materials for the individual layers were extracted at a temperature processing 180 ° C so that the first layer, the second layer and the third layer became layers of 20 μm, 60 μm and 20 μm thick, respectively. Then, the tubular film was cut to get a three layer laminated film. The inner layer of the tubular film was the third layer and the second layer was the first layer. [Examples 2-6, Comparative Examples 1-6]

The three-layer laminated films were produced in the same manner as in Example 1 except to change the compositions of the individual layers as shown in Tables 2 and 4.

The evaluation results of the resulting films are shown in Tables 2-5.

The codes indicated in Tables 2 and 4 are as follows: B1: EVATATE H2031 (ethylene / vinyl acetate copolymer, MFR = 1 g / 10 min, vinyl acetate content = 19%) produced by Sumitomo Chemical Co., Ltd. B2: EVATATE D2011 (ethylene / vinyl acetate copolymer, MFR = 1 g / 10 min, vinyl acetate content = 5%) produced by Sumitomo Chemical Co., Ltd. E1: Thermal stabilizer (Name Commercial: SUMILIZER BP76, produced by Sumitomo Chemical Co., Ltd.). F1: Erosion agent: amine compound with steric hindrances (Trade name: Tinuvin 111FDL, produced by Ciba Specialty Chemicals). G1: UV benzophenone absorber (Trade name: Sumisorb produced by Sumitomo Chemical Co., Ltd.). H1: Anti-drip agent (non-ionic surfactant): Mixture of monoglycerol monostearate / diglycerol sesquiestearate with a weight ratio of 3/7. H2: Anti-drip agent (non-ionic surfactant): 1 mol propylene oxide adduct of sorbitan monostearate. I1: Anti-fogging agent (fluorine-containing surfactant) (Trade name: Unidyne DS402, produced by Daikin Industries, Ltd.). J1: IR absorber: lithium aluminum complex hydroxide (Name

Commercial: Mizukalac, produced by Mizusawa Industrial Chemicals, Ltd.). K1: Lubricant: ethylenebisoleic amide. K2: Lubricant: erucamide.

Table 2

Example

one

2 3 4 5 6

3rd layer

Resin A1 A1 A1 A1 A1 A1

Thermal stabilizer

E1 (0.2) E1 (0.2) E1 (0.2) E1 (0.2) E1 (0.2) E1 (0.2)

Erosion agent

F1 (0.6) F1 (0.6) F1 (0.6) F1 (0.6) F1 (0.6) F1 (0.6)

UV absorber

G1 (0.24) G1 (0.24) G1 (0.24) G1 (0.24) G1 (0.24) G1 (0.24)

Lubricant

K1 (0.06) / K2 (0.2) K1 (0.06) / K2 (0.2) K1 (0.06) / K2 (0.2) K1 (0.06) / K2 (0.2) K1 (0.06) / K2 (0.2) K1 (0.06) / K2 (0.2)

Anti agent

H1 (0.5) / H1 (0.5) / H1 (0.5) / H1 (0.5) / H1 (0.5) / H1 (0.5) /

drip

H2 (0.8) H2 (0.8) H2 (0.8) H2 (0.8) H2 (0.8) H2 (0.8)

Anti-fogging agent

I1 (0.2) I1 (0.2) I1 (0.2) I1 (0.2) I1 (0.2) I1 (0.2)

Thickness (μm)

twenty twenty twenty twenty 33 33

2nd layer

Resin (weight ratio) A1 / B1 (50/50) A1 / B1 (50/50) A2 / B1 (50/50) A2 / B1 (50/50) A2 / B1 (25/75) A2 / B1 (75/25)

Thermal stabilizer

E1 (0.2) E1 (0.2) E1 (0.2) E1 (0.2) E1 (0.2) E1 (0.2)

Erosion agent

F1 (0.6) F1 (0.6) F1 (0.6) F1 (0.6) F1 (0.6) F1 (0.6)

IR Absorbent

J1 (8) J1 (8) J1 (8) J1 (8) J1 (8) J1 (8)

Anti agent

H1 (0.6) / H1 (0.6) / H1 (0.6) / H1 (0.6) / H1 (0.6) / H1 (0.6) /

drip

H2 (0.9) H2 (0.9) H2 (0.9) H2 (0.9) H2 (0.9) H2 (0.9)

Thickness (μm)

60 60 60 60 3. 4 3. 4

1st layer

Resin (weight ratio) B2 A1 / B2 (50/50) B2 A2 / B2 (50/50) A2 / B2 (75/25) A2 / B2 (25/75)

Example 1

2

3

Four. Five

6 Stabilizer

E1 (0.2) E1 (0.2)

E1 (0.2)

E1 (0.2) E1 (0.2) E1 (0.2) Thermal Agent F1 (0.6) F1 (0.6)

F1 (0.6)

F1 (0.6) F1 (0.6) F1 (0.6)

erosion K1 (0,06) / K1 (0,06) /

K1 (, 0.06) /

K1 (0.06) / K1 (0.06) / K1 (0.06) / Lubricant K2 (0.2) K2 (0.2)

K2 (0.2)

K2 (0.2) K2 (0.2)

K2 (0.2) Anti Agent

H1 (0.6) / H1 (0.6) /

H1 (0.6) /

H1 (0.6) / H1 (0.6) /

H1 (0.6) / drip

H2 (0.9) H2 (0.9)

H2 (0.9)

H2 (0.9) H2 (0.9)

H2 (0.9) Anti Agent

I1 (0.2) I1 (0.2)

I1 (0.2)

I1 (0.2) I1 (0.2) I1 (0.2) fogging Thickness (μm) 20 20

twenty

20 33 33

Table 3

Example

one

2 3 4 5 6

Overall Thickness (μm)

100 100 100 100 100 100

Transparency (Turbidity)

17 17 17 17 16 18

Turbidity after storage (Δ Turbidity)

21 (4) 20 (3) 20 (3) 21 (4) 21 (5) 21 (3)

Anti-drip property

Low temperature -2 / 20ºC

7 days TO TO TO TO TO TO

3 months

TO TO TO TO TO TO

6 months

B B B B TO B

High temperature 23 / 40ºC

7 days TO TO TO TO TO TO

3 months

TO TO TO TO TO TO

6 months

B B B B TO B

Tensile strength at break (MPa)

27 29 28 30 31 31

Table 4

Comparative Example

one

2 3 4 5 6

3rd layer

Resin A1 A1 A1 A1 A1 A1

Thermal stabilizer

E1 (0.2) E1 (0.2) E1 (0.2) E1 (0.2) E1 (0.2) E1 (0.2)

Erosion agent

F1 (0.6) F1 (0.6) F1 (0.6) F1 (0.6) F1 (0.6) F1 (0.6)

UV absorber

G1 (0.24) G1 (0.24) G1 (0.24) G1 (0.24) G1 (0.24) G1 (0.24)

Lubricant

K1 (0.06) / K2 (0.2) K1 (0.06) / K2 (0.2) K1 (0.06) / K2 (0.2) K1 (0.06) / K2 (0.2) K1 (0.06) / K2 (0.2) K1 (0.06) / K2 (0.2)

Drip agent

H1 (0.5) / H2 (0.8) H1 (0.5) / H2 (0.8) H1 (0.5) / H2 (0.8) H1 (0.5) / H2 (0.8) H1 (0.5) / H2 (0.8) H1 (0.5) / H2 (0.8)

Anti-fogging agent

I1 (0.2) I1 (0.2) I1 (0.2) I1 (0.2) I1 (0.2) I1 (0.2)

Thickness (μm)

twenty twenty twenty twenty twenty twenty

2nd layer

Resin (weight ratio) A3 / B1 (50/50) A3 / B1 (50/50) A3 / B1 (50/50) B1 A1 A1 / B1 (50/50)

Thermal stabilizer

E1 (0.2) E1 (0.2) E1 (0.2) E1 (0.2) E1 (0.2) E1 (0.2)

Erosion agent

F1 (0.6) F1 (0.6) F1 (0.6) F1 (0.6) F1 (0.6) F1 (0.6)

IR Absorbent

J1 (8) J1 (8) J1 (8) J1 (8) J1 (8) J1 (8)

Drip agent

H1 (0.6) / H2 (0.9) H1 (1.0) / H2 (1.5) H1 (1.0) / H2 (1.5) H1 (1.0) / H2 (1.5) H1 (1.0) / H2 (1.5) -

Thickness (μm)

60 60 60 60 60 60

1st layer

Resin (weight ratio) 82 82 A4 / B2 (50/50) B2 A1 A1 / B2 (50/50)

Thermal stabilizer

E1 (0.2) E1 (0.2) E1 (0.2) E1 (0.2) E1 (0.2) E1 (0.2)

Erosion agent

F1 (0.6) F1 (0.6) F1 (0.6) F1 (0.6) F1 (0.6) F1 (0.6)

Comparative Example

1 2 3 4 5

K1 (0.06) / K1 (0.06) / K1 (0.06) / K1 (0.06) / K1 (0.06) / K1 (0.06) /

Lubricant

K2 (0.2) K2 (0.2) K2 (0.2) K2 (0.2) K2 (0.2) K2 (0.2)

Anti agent

H1 (0.6) / H1 (1.0) / H1 (1.0) / H1 (1.0) / H1 (0.6) / -

drip

H2 (0.9) H2 (1.5) H2 (1.5) H2 (1.5) H2 (0.9)

Anti-fogging agent

I1 (0.2) I1 (0.2) I1 (0.2) I1 (0.2) I1 (0.2) I1 (0.2)

Thickness (μm)

twenty twenty twenty twenty twenty twenty

Table 5

Comparative Example

one

2 3 4 5 6

Overall Thickness (μm)

100 100 100 100 100 100

Transparency (Turbidity)

18 19 19 18 18 17

Turbidity after storage (Δ Turbidity)

26 (8) 33 (14) 34 (15) 21 (3) 26 (8) 17 (0)

Anti-drip property

Low temperature -2 / 20ºC

7 days TO TO TO TO TO C

3 months

C B B B B C

6 months

C C C C C C

High temperature 23 / 40ºC

7 days TO TO TO TO TO C

3 months

C B B B B C

6 months

C C C C C C

Tensile strength at break (MPa)

28 28 30 22 28 27

Claims (3)

one.

An agricultural film comprising a first layer and a second layer, the first layer being a layer comprising a thermoplastic resin and constitutes a surface of the film, the second layer being a layer that is adjacent to the first layer comprising a component ( A), a component (B) and a component (C) each defined below, where in the second layer the content of component (B) is 20 to 900 parts by weight per 100 parts by weight of component (A) , the content of component (C) is 0.01 to 5% of the combined weight of components (A), (B) and (C):

component (A): an ethylene / α-oleophin copolymer comprising structural units obtained from ethylene and structural units obtained from an α-oleophin having 3 to 20 carbon atoms and having a melt flow rate of 0.01 to 5 g / 10 min, measured at a temperature of 190 ° C and a load of 21.18 N according to method A provided in JIS K7210-1995, and a flow activation energy (Ea) of 60 kJ / mol at 100 kJ / mol, as defined by the equation (log (aT) = Ea / R (1 / T-1 / T0), where R is the gas constant and T0 is the standard temperature of 189, 94 ° C (463 ° K) and aT is the transfer factor as defined in the specification: component (B): an ethylene / vinyl acetate copolymer comprising structural units obtained from ethylene and structural units obtained from vinyl acetate and which it has a melt flow rate of 0.01 to 5 g / 10 min, measured at a temperature of 90 ° C and a load of 21.18 N according to method A provided in JIS K7210-1995 and a content of structural units obtained from vinyl acetate from 3 to 20% by weight; component (C): a non-ionic surfactant.

2.

The agricultural film according to claim 1, wherein:

the first layer comprises a component (A), a component (B), a component (C) and a component (D) each defined below, in which in the first layer the content of the component (B) is 20 at 900 parts by weight per 100 parts by weight of component (A), the content of component (C) is 0.01 to 5% of the combined weight of the components (A), (B), (C) and (D) and the content of component (D) is 0.01 to 3% of the weight combined of components (A), (b), (C) and (D): component (A): an ethylene / α-oleophin copolymer comprising structural units obtained from ethylene and structural units obtained from an α-oleophin that it has 3 to 20 carbon atoms and it has a melt flow rate of 0.01 to 5 g / 10 min, measured at a temperature of 190 ° C and a load of 21.18 N according to method A provided in the document JIS K7210-1995, and a flow activation energy (Ea) of 60 kJ / mol at 100 kJ / mol, as defined by the equation (log (aT) = Ea / R (1 / T-1 / T0 ), where R is the gas constant and T0 is the standard temperature of 189.94 ° C (463 ° K) and aT is the transfer factor as defined in the specification. Component (B): an ethylene copolymer / vinyl acetate comprising structural units obtained from ethylene and structural units obtained from vinyl acetate and having a melt flow rate of 0.01 to 5 g / 10 min, measured at a temperature ura of 90 ° C and a load of 21.18 N according to method A provided in JIS K7210-1995 and a content of structural units obtained from vinyl acetate from 3 to 20% by weight; component (C): a non-ionic surfactant. component (D): a fluorine-containing surfactant, a silicone-based surfactant or a mixture of a fluorine-containing surfactant and a silicone-based surfactant. 3. The agricultural film according to claim 1 or 2, further comprising a third layer comprising a thermoplastic resin, wherein the third layer constitutes another surface of the film.