JP5014746B2 - Laminate film and agricultural and horticultural facilities - Google Patents

Description

The present invention relates to a laminated film having excellent antifogging properties even after being subjected to high temperature conditions or after being subjected to high temperature conditions, and an agricultural and horticultural facility in which the laminated film is stretched.

In recent years, the demand for resins used outdoors, such as automobile materials, building materials, and agricultural materials, has increased dramatically. For example, as an agricultural material, the film for agriculture used for covering of facilities, such as a house and a tunnel, is mentioned. Conventionally, films made of polyolefin resins such as polyvinyl chloride films, polyethylene, and ethylene / vinyl acetate copolymers have been widely used as agricultural films. Recently, polyolefin resin films, which are lightweight and hardly generate toxic gases during incineration, have been widely used for gardening. One of the important performances required for these agricultural films is to prevent condensation on the inner surface of the house caused by the temperature difference between the inside and outside of the house, and to prevent the formation of water droplets. That is, an anti-fogging property is mentioned.

As a method for imparting an antifogging property to a film, a method of kneading an antifogging agent in the film or a method of applying a coating liquid containing an antifogging agent to the film surface is general. As an example of an agricultural film kneaded with an antifogging agent, as disclosed in Patent Document 1, an outer layer made of an ethylene / vinyl acetate copolymer, an ultra-low density ethylene / α-olefin copolymer, And a laminated film composed of an intermediate layer containing an antifogging agent, an ethylene / vinyl acetate copolymer, and an inner layer containing the antifogging agent. Patent Document 2 discloses an antifogging olefin agricultural film having a five-layer structure.

JP-A-6-126911 JP 2000-354426 A

However, an agricultural film of a type in which an antifogging agent is kneaded into the film described above exhibits good antifogging properties under a certain condition of temperature in the agricultural house, but the temperature in the house rises, and the house When the film surface arranged on the inside is exposed to a high temperature state, the antifogging agent oozes out from the film and water droplets adhere, or once water droplets adhere, the temperature in the house then increases. There is a problem that the anti-fogging property does not recover even if the temperature drops. Water droplets impair the transparency of the film, reduce sunlight transmission and adversely affect the growth of the crops, as well as the growth of water droplets that fall on the crops due to gravity. There is a risk of triggering. In winter, the side windows of the house are closed to block outside cold air, and heating is sometimes performed in the house. In such a case, the upper part of the house may be exposed to an abnormally high temperature. Even if the film does not adhere to water when the side windows are opened and ventilated, water drops will be generated when the temperature near the film becomes high in the environment. Adhesion sometimes occurred.

The present invention can maintain antifogging properties even when exposed to a high temperature environment, or even if the antifogging properties are once lowered, the laminated film can recover the antifogging properties if the environmental temperature is lowered. And an agricultural and horticultural facility in which the laminated film is stretched.

That is, in the present invention, in the laminated film comprising at least three layers, when one surface layer is an A layer, the other surface layer is a B layer, and the other layer positioned between the A layer and the B layer is a C layer, It is a laminated film that satisfies all the conditions.
(1) The thickness of the C layer is 50 to 90% of the thickness of all layers.
(2) C _VA / T _VA is 0.1 or more and 1.5 or less, provided that C _VA = (total weight of structural units derived from vinyl acetate in the ethylene / vinyl acetate copolymer contained in the C layer) / (C The total weight of the resin components forming the layer),
T _VA = (total weight of structural units derived from vinyl acetate in the ethylene / vinyl acetate copolymer contained in each layer) / (total weight of resin components forming each layer)
(3) T _VA is 7.0% to 0.1% or less (4) of Zensochu, non-ionic surfactant concentration above the melting point 40 ° C. 2.0% to 5.0% or less (5 ) (Nonionic surfactant concentration in layer A) / (Nonionic surfactant concentration in all layers) is 0.2 or more and 5.0 or less Further, in the present invention, the laminated film is used for agriculture and horticulture. It is an agricultural and horticultural facility that is extended on a facility frame, and is an agricultural and horticultural facility that is extended so that the layer A of the laminated film is located inside the facility.

The laminated film of the present invention is resistant to water droplets on the film surface even under a high temperature environment, that is, it can maintain the antifogging property. Is something that can be recovered. Moreover, the agricultural and horticultural facilities of the present invention in which the laminated film is stretched have excellent anti-fogging properties.

A laminated film with an antifogging agent kneaded when the antifogging agent in the resin is exposed to the film surface, but the resin type is selected simply from the requirements of mechanical strength and optical characteristics. Even if the antifogging agent is kneaded, even if the liquid droplets are exhibited at normal temperature, the liquid droplets are not exhibited in a high temperature environment where the saturated solubility of the resin is high. Therefore, it is necessary to determine the antifogging agent addition concentration from the saturated solubility of the antifogging agent in the resin, and further to select a resin arrangement that minimizes the addition amount. When an excessive antifogging agent is added, not only the productivity is deteriorated, but also transparency required particularly when used as an agricultural film is deteriorated.
In order to optimize the flowability of the laminated film, there are appropriate resin arrangement and antifogging agent concentration, and the present invention has found these. The present invention is described in detail below.

The laminated film of the present invention is a film having a multilayer structure composed of at least three layers. Hereinafter, one surface layer in the agricultural film of the present invention is an A layer, the other surface layer is a B layer, and other layers positioned between the A layer and the B layer are collectively referred to as a C layer.

The C layer may be a single layer or a multilayer, but in any case, the thickness is 50 to 90%, preferably 55 to 70% of the total thickness. The C layer is usually 1 to 3 layers.

The A layer, the B layer, and the C layer are all made of a thermoplastic resin. The thermoplastic resin constituting each layer only needs to include an ethylene / vinyl acetate copolymer as the thermoplastic resin constituting the C layer and satisfy the following requirements (2) and (3).
(2) C _VA / T _VA is 0.1 or more and 1.5 or less (3) T _VA is 0.1% or more and 7.0% or less, provided that C _VA = (ethylene Total weight of structural units derived from vinyl acetate in the vinyl acetate copolymer) / (total weight of resin components forming the C layer), and T _VA = (in the ethylene / vinyl acetate copolymer contained in each layer) Total weight of structural units derived from vinyl acetate) / (total weight of resin components forming each layer). Hereinafter, "vinyl acetate concentration of the C layer" a C _VA, the T _VA may be referred to as "vinyl acetate concentration of all layers".

The ethylene / vinyl acetate copolymer in the present invention is an ethylene / vinyl acetate copolymer containing a structural unit derived from ethylene and a structural unit derived from vinyl acetate.

The amount of structural units derived from vinyl acetate contained in each layer is determined by taking a slice of a cross-section with a microtome for each layer inside the film and quantifying the vinyl acetate concentration of each layer by microinfrared spectroscopy using this slice. Can do. Moreover, about the film outermost surface layer (namely, A layer and B layer), an infrared spectroscopy measurement can be performed by ATR method and vinyl acetate concentration can be quantified.

When the thickness ratio of the A layer, the C layer, and the B layer is x: y: z, and the resin component forming each layer is 100% by weight, the concentrations of the structural units derived from vinyl acetate are a, c, when the b (%), vinyl acetate concentration T _VA of all layers can be represented by (ax + cy + bz) / (x + y + z). The second decimal place shall be rounded off.

In the case where the C layer has a multilayer structure of n layers, the average vinyl acetate concentration in the C layer can be obtained and calculated by substituting it into the formula c. The average concentration of the n layer is obtained by (total of C _i h _i ) / (C layer thickness) when the vinyl acetate concentration of the i layer is C _i and the thickness of the i layer is h _i . However, i is a natural number of 1 to n.

The vinyl acetate concentration T _VA of all layers is 0.1% or more and 7.0% or less, preferably 0.3% or more and 5.0% or less, and 0.5% or more and 2.6% or less. It is particularly preferred. The T _VA by the range of the, the film excellent in antifogging property under high temperature conditions.

C _VA / T _VA is obtained by rounding off the second decimal place. In the laminated film of the present invention, C _VA / T _VA is from 0.1 to 1.5, and more preferably from 0.3 to 1.2. By setting C _VA / T _VA within the above range, a film having excellent antifogging properties under high temperature conditions can be obtained. Incidentally, the layer C is at other layer structure comprising n layers, wherein the C _VA of C _VA / T _VA, is calculated by applying the average concentration of C layer.
When _TVA is large, the saturation solubility of the antifogging agent at high temperature becomes high, so in order to bleed the antifogging agent on the film surface at high temperature, a large amount of antifogging agent is required. It may worsen transparency. On the other hand, if _TVA is too small, the flexibility of the film may be impaired or the film processability may deteriorate.
C layer thickness is more than half of the total thickness, and occupies a large proportion in the film. When C _VA / T _VA is large, the saturation solubility of the antifogging agent in the C layer becomes relatively large in the film, so that the antifogging agent easily migrates from both surface layers to the C layer, and the surface of the A layer The droplet performance tends to deteriorate. On the other hand, when C _VA / T _VA is small, when other additives such as a heat retaining agent and a weathering agent are blended, these dispersions may be deteriorated.

The resin component forming each layer of the agricultural film of the present invention is not particularly limited as long as it satisfies the above-described requirements (2) and (3), and a known thermoplastic resin is used. be able to. From the viewpoint of balance of transparency, flexibility and strength of the film, each layer is preferably formed from an ethylene-based resin.

Examples of the ethylene resin include, but are not limited to, low density polyethylene, linear low density polyethylene, and a copolymer of ethylene and an α-olefin having 3 to 20 carbon atoms. is not.

Examples of the α-olefin having 3 to 20 carbon atoms include propylene, 1-butene, 4-methyl-1-pentene, 1-hexene, 1-octene and 1-decene. More preferable examples include 4-methyl-1-pentene and 1-hexene. The α-olefin having 3 to 20 carbon atoms may be a combination of two or more. For example, 1-butene and 4-methyl-1-pentene, 1-butene and 1-hexene, 1-butene and 1 -Octene, 1-butene, 1-decene and the like. More preferably, 1-butene and 4-methyl-1-pentene, 1-butene and 1-hexene are mentioned.

The ethylene / α-olefin copolymer in the present invention is preferably a copolymer of ethylene and an α-olefin having 5 to 10 carbon atoms, or ethylene, 1-butene and an α-olefin having 5 to 10 carbon atoms. More preferably, it is a copolymer of ethylene and an α-olefin having 6 to 10 carbon atoms, or a copolymer of ethylene, 1-butene and an α-olefin having 6 to 10 carbon atoms. It is a polymer.

The laminated film of the present invention contains a nonionic surfactant having a melting point of 40 ° C. or higher as an antifogging agent. Specific examples of such anti-fogging agents include sorbitan fatty acid esters such as sorbitan monopalmitate, sorbitan monostearate, sorbitan monopalmitate, sorbitan monomontanate, sorbitan monooleate, sorbitan dioleate and alkylene thereof. Sorbitan surfactants such as oxide adducts, glycerol monopalmitate, glycerol monostearate, diglycerol distearate, triglycerol monostearate, tetraglycerol dimontanate, glycerol monooleate, diglycerol monooleate, Diglycerin sesquioleate, tetraglycerin monooleate, hexaglycerin monooleate, hexaglycerin trioleate, tetraglycerin trioleate, tetraglycerin mono Glycerin surfactants such as glycerol fatty acid esters and alkylene oxide adducts thereof such as urate and hexaglycerol monolaurate, polyethylene glycol surfactants such as polyethylene glycol monopalmitate and polyethylene glycol monostearate, alkylene oxides of alkylphenols Adduct, ester of sorbitan / glycerin condensate and organic acid, polyoxyethylene (2 mol) stearylamine, polyoxyethylene (4 mol) stearylamine, polyoxyethylene (2 mol) stearylamine monostearate, polyoxy And polyoxyethylene alkylamines such as ethylene (4 mol) laurylamine monostearate and fatty acid esters thereof. These may be used alone or in combination of two or more.

In addition to the nonionic surfactant having a melting point of 40 ° C. or higher, the laminated film of the present invention may contain a surfactant that is liquid at room temperature represented by glycerin oleate and diglycerin oleate. Hereinafter, when it is described as an antifogging agent without any notice, it means a nonionic surfactant having a melting point of 40 ° C. or higher.

When the thickness ratio of the A layer, the C layer, and the B layer is x: y: z, and the antifogging agent concentration in each layer is a, c, and b (%), respectively, the antifogging agent concentration in all layers is , (Ax + cy + bz) / (x + y + z). The second decimal place shall be rounded off.

In the case where the C layer has a multilayer structure of n layers, the average antifogging agent concentration in the C layer can be obtained and calculated by substituting it into the formula c. Mean anti-fogging agent concentration in the n-layer, anti-fogging agent concentration of i-th layer is in C _i, when the thickness of the i layer is h _i, calculated by (sum of C _i h _i) / (C layer thickness) It is done. However, i is a natural number of 1 to n.

The antifogging agent concentration in all layers is 2.0% or more and 5.0% or less, and more preferably 1.8% or more and 3.0% or less. If the concentration of the antifogging agent in the film is too low, the antifogging property at high temperature is deteriorated, and if it is too high, the transparency tends to be deteriorated.

In the agricultural film of the present invention, the (antifogging agent concentration in layer A) / (antifogging agent concentration in all layers) is 0.2 or more and 5.0 or less, and 0.8 or more and 2.2. More preferably, it is as follows. The value is obtained by rounding off the second decimal place. If the value is too small, the high-temperature anti-fogging property tends to deteriorate, and if it is too large, the transparency of the film tends to deteriorate.
Even when the saturation solubility of the resin is increased in a high temperature environment, the antifogging agent concentration in the layer A for which the droplet dropability is required is required to be equal to or higher than the saturation solubility. For this purpose, the antifogging agent concentration in the A layer in the entire film must be high, and if the antifogging agent concentration is too low in the layer adjacent to the A layer, the antifogging agent blended in the A layer is used. However, since it shifts in a large amount under a high temperature environment, it is necessary to contain an antifogging agent at a certain concentration. It is preferable that the anti-fogging agent is contained in a certain concentration in the C layer as a whole and also in the B layer. However, if the amount of the antifogging agent contained in the entire film is too large, the transparency may be deteriorated.

Both surface layers in the laminated film of the present invention, that is, the A layer and the B layer may have the same composition or different compositions. When the composition is different, the layer satisfying the above requirement (5) is defined as layer A. Further, when both the A layer and the B layer satisfy the requirement (5), the layer having a large value is defined as the A layer.

The laminated film of the present invention may contain a known additive in addition to the antifogging agent, if necessary. Examples of the additive include an antioxidant, a light stabilizer, an ultraviolet absorber, an antifoggant, a lubricant, an antiblocking agent, an antistatic agent, a pigment, and an inorganic filler.

Examples of the antioxidant include phosphorus-based compounds containing trivalent phosphorus atoms such as so-called hindered phenol compounds such as 2,6-dialkylphenol derivatives and 2-alkylphenol derivatives, phosphite compounds, and phosphonite compounds. An ester compound is mentioned. These antioxidants may be used alone or in combination of two or more. In particular, from the viewpoint of stabilizing the hue, it is preferable to use a hindered phenol compound and a phosphorus ester compound in combination. Moreover, when the weight of each layer is 100%, the antioxidant is preferably contained in each layer in an amount of 0.01 to 1% by weight, and more preferably 0.03 to 0.5% by weight.

Examples of the light stabilizer include a hindered amine compound having a structure described in JP-A-8-73667, and specific examples thereof include trade names of tinuvin 622-LD, chimasorb 944-LD (hereinafter referred to as Ciba Specialty). Chemicals), Hostabin N30, VP Sanduvor PR-31 (manufactured by Clariant, Inc.), Saiyasorb UV3529, Saiyasorb UV3346 (manufactured by Cytec). Furthermore, a sterically hindered amine ether compound having a structure described in JP-A-11-315067 can be mentioned, and specifically, trade name Tinuvin NOR371 (manufactured by Ciba Specialty Chemicals) can be mentioned. The amount of the light stabilizer contained in each layer is preferably 0.01 to 3% by weight, more preferably 0.05 to 2% by weight, and particularly 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 can be used alone or in combination of two or more. You may use together. The amount of the ultraviolet absorber contained in each layer is preferably 0.01 to 3% by weight, more preferably 0.03 to 2% by weight, from the viewpoint of weather resistance imparting effect and suppression of bleeding on the film surface.

Examples of the antifogging agent include fluorine compounds having a perfluoroalkyl group, ω-hydrofluoroalkyl group, etc. (especially fluorine surfactants), and silicon compounds having an alkylsiloxane group, particularly silicon surfactants. ) And the like. Specific examples of the fluorosurfactant include Unidyne DS-403, DS-406, DS-401 (trade name) manufactured by Daikin Industries, Ltd., and Surflon KC-40 (trade name) manufactured by Seimi Chemical Co., Ltd. Examples of the silicon-based surfactant include SH-3746 (trade name) manufactured by Toray Dow Corning Silicon Co., Ltd. These may be used alone or in combination of two or more. The content of the antifogging agent is preferably 0.01 to 3% by weight, more preferably 0.02 to 2% by weight, and particularly preferably 0.05 to 1% by weight.

Examples of the inorganic filler include composite hydroxides such as hydrotalcite compounds and lithium aluminum composite hydroxide. Specific examples of the hydrotalcite compound include natural hydrotalcite and synthetic hydrotalcite such as trade name: DHT-4A (manufactured by Kyowa Chemical Industry) and magcrista (manufactured by Kyowa Chemical Industry). Specific examples of the lithium aluminum composite hydroxide include Mizukarak (manufactured by Mizusawa Chemical Industry), Fujirain (manufactured by Fuji Chemical Industry), and the like. Furthermore, metal oxides such as magnesium oxide, calcium oxide, aluminum oxide, silicon oxide, and titanium oxide; hydroxides such as lithium hydroxide, magnesium hydroxide, calcium hydroxide, and aluminum hydroxide; magnesium carbonate, calcium carbonate, etc. Carbonates of: sulfates such as potassium sulfate, magnesium sulfate, calcium sulfate, zinc sulfate, aluminum sulfate; lithium phosphate, sodium phosphate, potassium phosphate, calcium phosphate phosphate (for example, JP-A-8-67774) Disclosed phosphates such as H-type zirconium phosphate); silicates such as magnesium silicate, calcium silicate, aluminum silicate, titanium silicate; aluminates such as sodium aluminate, potassium aluminate, calcium aluminate; aluminum Sodium silicate, potassium aluminosilicate, aluminosilicates such as calcium aluminosilicate; kaolin, clay, clay minerals such as talc, and other composite oxides thereof.

The thickness of the laminated film of the present invention is preferably 0.01 mm or more from the viewpoint of film strength. Moreover, when using this laminated | multilayer film as a coating film of an agricultural and horticultural facility, from viewpoints of covering workability etc., 0.3 mm or less is preferable and the range of 0.03-0.25 mm is more preferable.

The method for producing the laminated film of the present invention is not particularly limited. When a resin composition is used as a material for forming each layer, a resin and a desired additive are mixed using a mixer to produce a resin composition, and the resin composition is used to make known It can be manufactured by a film forming method. As the mixer, for example, a conventional apparatus such as a ribbon blender, a super mixer, a Banbury mixer, a single screw extruder, or a twin screw extruder can be used.

Examples of the method for producing the laminated film include a coextrusion inflation molding method, a coextrusion T-die casting molding method, an extrusion lamination molding method, and a dry lamination molding method. It is preferable to manufacture by a coextrusion inflation molding method. When the agricultural film of the present invention is produced by the coextrusion inflation molding method, it is preferable that the A layer is located outside the tube. When a film is produced by inflation molding, a film is usually wound around a portion of the film extruded from an inflation die so as to be opened at the time of stretching. In the wound state, the inner layers of the tubular film are in contact with each other. When the film is spread on an agricultural and horticultural facility frame to be used as an agricultural or horticultural facility, the film is pulled out from the wound state, opened from the cut line, and spread on the agricultural and horticultural facility frame. Considering the workability at that time, it is preferable that the A layer is located outside the tube as described above.

  The laminated film of the present invention is suitable as an agricultural film, that is, a covering film for agricultural and horticultural facilities such as greenhouses and tunnels for plant cultivation. In particular, it is preferable that the layer A of the laminated film of the present invention is spread on an agricultural and horticultural facility frame so that the layer A is inside the agricultural and horticultural facility, thereby forming an agricultural and horticultural facility. Such agricultural and horticultural facilities are suitable for growing crops because they have excellent anti-fogging properties even under high temperature conditions.

  Furthermore, the laminated film of the present invention can also be used for applications such as food packaging films that prevent adhesion of water droplets due to condensation caused by temperature differences inside and outside the film.

Examples of the present invention will be described below, but the present invention is not limited thereto. In addition, the test method in an Example and a comparative example is as follows.
<Drip performance evaluation method>
The film is affixed to a 34 x 5 cm acrylic frame with double-sided tape, with the A layer facing down, and a 15-degree tilt with respect to the horizontal plane on a constant-temperature water bath placed in an environmental test chamber with a constant temperature. And evaluated by the following temperature cycle.
Environment room temperature / water bath temperature -3 ° C / 20 ° C 5 days later Evaluation 1
Continuously −3 ° C./60° C. 5 days continuously −3 ° C./20° C. 5 days later Evaluation 2
Continue -3 ° C / 80 ° C for 5 days Continue -3 ° C / 20 ° C 5 days later Evaluation 3
Continue -3 ° C / 20 ° C 5 days later Evaluation 4

At each evaluation timing, the state of water droplets on the film surface was visually observed and judged according to the following criteria.
○: The film surface is uniformly wet.
Δ: Some water droplets are attached.
X: Water droplets adhere to the entire surface and are white and cloudy.

<Preparation of additive masterbatch>
Each resin and additive were weighed according to the formulation shown in Table 1, kneaded at 150 ° C. for 5 minutes using a 5 L Banbury mixer, and then granulated by a granulator to obtain additive master batch pellets MB1 to MB6. It was.

<Preparation of pellets for film production>
Similarly, in accordance with the formulations shown in Tables 2 and 3, each resin, antifogging agent, and MB1 to MB6 were blended, kneaded at 150 ° C. for 5 minutes using a 5 L Banbury mixer, and then granulated by a granulator. It granulated and produced the pellet for every layer of Examples 1-4 and Comparative Examples 1-5.

<Production of agricultural film>
A three-layer inflation molding machine equipped with a 40 mm extruder for each layer, using a 100 mmφ die, 1.2 mm lip, and at a processing temperature of 180 ° C., the A layer is 20 μm, the C layer is 60 μm, and the B layer is 20 μm. Then, a three-layered tube-shaped film was formed and cut to obtain a three-layer laminated film. The inner layer of the tubular film was a B layer and the outer layer was an A layer.

Tables 3 to 4 show the vinyl acetate concentration, the antifogging agent (H2) concentration, and the concentration ratios of the vinyl acetate concentration and the antifogging agent (H2) concentration in all layers of each layer of the obtained film. The vinyl acetate concentration of each layer is (total weight of structural units derived from vinyl acetate in the ethylene / vinyl acetate copolymer contained in the layer) / (total weight of resin components forming the layer), The vinyl acetate concentration of the layer is (total weight of structural units derived from vinyl acetate in the ethylene / vinyl acetate copolymer contained in each layer) / (total weight of resin components forming each layer).

[Evaluation]
The evaluation results are shown in Tables 6-7. In each of the films of Examples 1 to 4, in evaluations 1 to 4, there was no water droplet adhesion on the film. In all of the films of Comparative Examples 1 to 5, water drops adhered to the film at the stage of evaluation 2, and the film was white and cloudy. Thereafter, even if the water tank temperature was changed, the liquid drop performance was not recovered.

The abbreviations described in Table 1, Table 2, and Table 3 are as follows.
A1: Ethylene / 1-hexene copolymer Exelen GMH GH051 Sumitomo Chemical A2: Ethylene / 1-hexene copolymer Exelen GMH GH030 Sumitomo Chemical A3: Sumikasen E FV402 Sumitomo Chemical Co., Ltd. (ethylene / 1-hexene) Polymer)
A4: Sumikasen E FV203 manufactured by Sumitomo Chemical Co., Ltd. (ethylene / 1-hexene copolymer)
B1: Evertate H2011 (ethylene / vinyl acetate copolymer, MFR = 3, vinyl acetate content 15%) Sumitomo Chemical B2: Evertate D2011 (ethylene / vinyl acetate copolymer, MFR = 1.5, vinyl acetate content 5%) ) B3 manufactured by Sumitomo Chemical Co., Ltd .: Evertate H2031 (ethylene / vinyl acetate copolymer, MFR = 1, vinyl acetate content 19%) D1: lithium aluminum composite hydroxide manufactured by Sumitomo Chemical Co., Ltd.
E1: Trade name: Sumilizer BP76 Sumitomo Chemical F1: Trade name: Shilton JC30 Mizusawa Chemical G1: Hindered amine compound (trade name: Tinuvin 111FDL Ciba Specialty Chemicals)
H1: Nonionic surfactant Product name Riquemar SMO72A Made by Riken Vitamin (melting point <0 ° C)
H2: Nonionic surfactant Brand Name Riquemar SMR21 Made by Riken Vitamin (melting point 55-70 ° C)

Claims (3)

In a laminated film composed of at least three layers, when one surface layer is an A layer, the other surface layer is a B layer, and the other layer positioned between the A layer and the B layer is a C layer, all of the following conditions are satisfied. A laminated film characterized by
(1) The thickness of the C layer is 50 to 90% of the thickness of all layers.
(2) C _VA / T _VA is 0.1 or more and 1.5 or less, provided that C _VA = (total weight of structural units derived from vinyl acetate in the ethylene / vinyl acetate copolymer contained in the C layer) / (C The total weight of the resin components forming the layer),
T _VA = (total weight of structural units derived from vinyl acetate in the ethylene / vinyl acetate copolymer contained in each layer) / (total weight of resin components forming each layer)
(3) T _VA is 2.6% or more and 0.5% or less (4) of Zensochu, melting point 40 non-ionic surfactant concentration above ℃ 2.0% to 5.0% or less
(5) (Nonionic surfactant concentration in layer A) / (Nonionic surfactant concentration in all layers) is 0.2 to 5.0
(6) The nonionic surfactant concentration in layer A is higher than the nonionic surfactant concentration in layer B The laminated film according to claim 1, which is an agricultural film. An agricultural and horticultural facility in which the laminated film according to claim 1 is stretched on an agricultural and horticultural facility frame, wherein the laminated film is stretched so that the layer A is inside the facility. Facilities.