JPH0994930A - Agricultural laminated film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an agricultural laminated film excellent in anti-fog lasting properties when developed on a house or tunnel and having characteristics hard to staining the outer surface of the house (dustproof properties). SOLUTION: An agricultural laminated film is obtained by laminating an inner layer B based on high density polyethylene with density of 0.94-0.97g/m<3> and characterized by that the content X1 of an elastic copolymer is 5<X1<=40wt.% on the inner surface of an intermediate layer A based on an olefinic resin and laminating an outer layer B' based on high density polyethylene with density of 0.94-0.97g/cm<3> and characterized by that the content X of an elastic copolymer is 0<=X2<=X1wt.% on the outer surface of the intermediate layer A of the intermediate layer A and the inner layer B contains one or more kind of an anti-fogging agent.

Description

Detailed Description of the Invention

[0001]

The present invention relates to an agricultural laminated film. More specifically, the present invention relates to an agricultural laminated film which has excellent anti-fogging property when spread on a house or tunnel and has a property (dust-proof property) that the outer surface of the house is not easily soiled.

[0002]

2. Description of the Related Art A large amount of plastic film is used as a covering material for greenhouses and horticulture such as tunnels, and a typical example thereof is a polyvinyl chloride film (hereinafter referred to as agricultural plastic) and a polyethylene film (hereinafter referred to as agricultural plastic). Polyethylene) and ethylene vinyl acetate copolymer film (hereinafter referred to as agricultural vinegar). Of these, agricultural vinegar has heat retention, transparency, toughness, anti-fogging properties, house adhesion, and economy. It has excellent properties and is used most often. But,
Agricultural plastics are poor in workability and dust resistance due to the plasticizer contained in the film bleeding out and stickiness on the surface, and recently, various problems such as generating harmful gas at the time of incineration disposal are occurring, An alternative is desired.

On the other hand, although agricultural poly and agricultural vinegar have advantages over agricultural viticula in terms of workability, dust resistance and disposal, they have antifogging durability, transparency, toughness and house adhesion. There was a problem that was inferior. Agricultural poly, which is made of an ethylene polymer, has a problem in imparting antifogging property and antifogging sustainability because it has no polar group. In general, when an agricultural film without anti-fogging property is used as a covering material for a house or tunnel, the water in the soil evaporates and the water content condenses on the inner surface of the film to form water droplets. However, since the film is clouded by the water drops and a part of the sun rays is reflected, the amount of light rays passing through the film is reduced, so that the temperature increasing effect in the house or the tunnel is reduced. In addition, the water droplets condensed on the inner surface of the film fall on the cultivated crops, damaging the shoots and seedlings,
In addition, there are adverse effects such as the occurrence of diseases. Against these adverse effects, a film in which a surfactant having an action of an antifogging agent is kneaded is used, and this antifogging agent prevents evaporated water from staying as a water drop on the film surface, It has the function of spreading water droplets in a film shape and causing them to flow down along the inner surface of the film. In the agricultural film having antifogging property, the kneaded antifogging agent diffuses and leaches from the inside of the film along the surface and is coordinated on the film surface to exert a surface activating effect. However, since the antifogging agent that appears on the film surface is washed away by water drops during use, it is necessary to always transfer the antifogging agent from the inside of the film toward the surface in order to maintain the antifogging property of the film. It is apparent that the longer the antifogging effect, that is, the more durable the antifogging effect is, the more practically the antifogging film is. In order to produce such a film having a long anti-fogging effect, generally, a large amount of anti-fogging agent is added at the time of film production, or an anti-fogging agent having a slow migration rate from the inside of the film to the surface after film formation is used. Attempts have been made to make selective use. However, the former, that is, a method of adding a large amount of anti-fogging agent during film production is effective for maintaining anti-fogging, but the amount transferred to the surface immediately after film formation is severe, and transparency due to whitening of the anti-fogging agent There are problems such as deterioration and adhesion between films, and it is actually difficult to increase it beyond a certain amount, and the latter method also has an antifogging effect, and this antifogging effect is long. No anti-fogging agent has been found in practice to last for a period of time.

In view of the above situation, the present invention has an inner layer and an outer layer having high density polyethylene as a main component laminated on the inner and outer surfaces of an intermediate layer having an olefin resin as a main component, and at least one of the inner layer and the intermediate layer has a protective layer. To provide an agricultural film which is excellent in antifogging property and antifogging durability by adding a specific amount of an elastic copolymer to the inner and outer layers in a structure in which a clouding agent is added, and which is also excellent in dustproof property. Made possible.

[0005]

The present invention has the following constitution. (1) On the inner surface of the intermediate layer A containing olefin resin as a main component, the content X1 of the elastic copolymer containing high density polyethylene having a density of 0.94 to 0.97 g / cm ³ as a main component is 5 <X1 ≦ 40% by weight.
The inner layer B is laminated, and the density of 0.94 is provided on the outer surface of the intermediate layer A.
To 0.97 g / cm ³ of high density polyethylene as a main component and an elastic copolymer content X2 of 0 ≦ X2 <X1% by weight, the outer layer B ′ is laminated, and the intermediate layer A and An agricultural laminated film in which at least one layer of the inner layer B contains at least one antifogging agent. (2) High-density polyethylene is melt flow rate (190
C., 2.16 kgf) is 0.1 to 5.0 g / 10 minutes, and the ratio Mw / Mn of the weight average molecular weight Mw to the number average molecular weight Mn is 3 to 10.
The agricultural laminated film according to claim 1, which is in the range of (3) The inorganic filler is 0.5 to 2 in the inner layer B and the outer layer B '.
The agricultural laminated film according to the above-mentioned item 1, which contains 0% by weight.

Hereinafter, the present invention will be described in detail. The intermediate layer A used in the present invention may be a single layer or a multilayer of two or more layers. In the case of two or more layers, for example, a lamination of an antifogging layer and a heat retaining layer, a lamination of an antifogging layer, a film strength improving layer and a heat retaining layer, a lamination of a heterogeneous polymer layer and an adhesive layer, and the like can be given.

The olefin resin used in the intermediate layer A is a homopolymer of α-olefin or a copolymer of α-olefin with a different monomer, such as propylene homopolymer or Ethylene, 1-butene, 1
-Pentene, a propylene-based polymer which is a copolymer with 1-hexene, an ethylene homopolymer, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1
-Ethylene-based polymers which are copolymers with octene and vinyl acetate can be mentioned, but ethylene-based polymers are preferred in order to improve flexibility, weather resistance and transparency, and also in terms of price. These resins may be used alone or in combination of two or more. In addition, the main component in the present invention refers to a component in the most weight ratio among the resin components.

Of these, an ethylene polymer having a density of 0.88 to 0.935 g / cm ³ is preferably used because it has appropriate flexibility and transparency, but the melt flow rate (190
Melt flow rate (190 ° C, 2.16 kgf) of 0.1 g / 10 min or less has a problem of film forming workability, and that of 5 g / 10 min or more has a decrease in strength. 2.16kgf)
It is preferably 0.1 g / 10 minutes or more and 5 g / 10 minutes or less.

An elastic polymer may be added to the olefin resin used for the intermediate layer A. This makes it possible to impart flexibility and improve the durability of the antifogging property. As the elastic copolymer, ethylene-propylene copolymer, polybutadiene polymer, styrene-butadiene copolymer, styrene-ethylene-butylene copolymer, acrylonitrile-butadiene copolymer, styrene-isoprene copolymer and the like are known. In the case where the main component of the intermediate layer A is an ethylene polymer, an ethylene-propylene elastic copolymer or a styrene-ethylene-butylene copolymer is used to maintain transparency. It is preferable to use.

Further, an ethylene-vinyl acetate copolymer is used as an elastic polymer for the purpose of improving flexibility, and has a vinyl acetate content of 30% by weight or less and 5% by weight or more,
The melt index is preferably 0.1 g / 10 minutes or more and 5 g / 10 minutes or less. When the vinyl acetate content is 30% by weight or more, the processability is deteriorated, and when the vinyl acetate content is 5% by weight or less, the same properties as those of other ethylene polymers are obtained. Further, if the melt index is 0.1 g / 10 min or less, the film forming workability is deteriorated, and if it is 5 g / 10 min or more, the strength is deteriorated.

In the present invention, the resin layers B and B ′ are mainly composed of high-density polyethylene, which improves the scratch resistance of the surface and prevents scratches and dirt from adhering to the sand and dust in the atmosphere. It also has the effect of suppressing damage and making it less likely to be damaged even when it comes into contact with aggregates such as houses and tunnels. High-density polyethylene is not only an ethylene homopolymer but also propylene, 1-butene, 1-pentene, 1-hexene,
Although it may be an ethylene copolymer with an α-olefin such as 4-methyl-1-pentene or 1-octene,
A density of 0.94 to 0.97 g / cm3 is used. Melt flow rate (hereinafter referred to as MFR (190 ℃, 2.16kgf)) is 0.01
~ 5.0g / 10min., MFR (190 ℃, 2.16kg)
When f) is 0.01 g / 10 minutes or less, the film-forming moldability is inferior.
If it exceeds 10 minutes, it becomes difficult to obtain sufficient film tear strength. From the perspective of transparency, MFR (190
Those having a MFR (190 ° C., 2.16 kgf) of 0.1 g / 10 minutes or more are preferably used because those having a C. 2.16 kgf) of less than 0.1 g / 10 minutes have poor transparency. The molecular weight distribution of the high density polyethylene is not particularly limited, but when the transparency of the film is required, the ratio Mw / Mn of the weight average molecular weight Mw and the number average molecular weight Mn is in the range of 3 to 10. Those are preferably used. If it is less than 3, it is not easy to produce the resin itself, and if it exceeds 10, it is difficult to obtain transparency. These high density polyethylenes include
If necessary, low-density polyethylene and linear low density polyethylene having a density of 0.91~0.93g / cm ^3, a density 0.87~0.91g / cm ³
Ultra low density polyethylene, ethylene-vinyl acetate copolymer, ethylene-acrylate copolymer, ethylene-methacrylate copolymer and the like can be added as appropriate.

The elastic polymer used for the resin layers B and B'includes ethylene-propylene copolymer, ethylene-butylene copolymer, polybutadiene polymer, styrene-butadiene copolymer, styrene-ethylene-butylene copolymer. Known elastic copolymers such as polymer, acrylonitrile-butadiene copolymer, styrene-isoprene copolymer and the like can be mentioned, but ethylene-polypropylene elastic copolymer or styrene-ethylene-butylene copolymer can be used as high density polyethylene. When it is added to, it is preferably used since flexibility and elastic recovery can be improved without lowering transparency. These elastic copolymers may be used alone or in combination of two or more.

Further, an inner layer and an outer layer having high density polyethylene as a main component are laminated on the inner and outer surfaces of an intermediate layer having an olefin resin as a main component, and an antifogging agent is added to at least one of the inner layer and the intermediate layer. In the above, the addition amount X1 of the elastic polymer to the inner layer is preferably 5 to 40% by weight, and the addition amount X2 of the elastic polymer to the outer layer is preferably less than X1% by weight. When X1 is less than 5%, sufficient antifogging durability cannot be obtained, and when it exceeds 40% by weight, the strength of the film is lowered and the workability is deteriorated due to the adhesion between the films. Further, when X2 is X1 or more, not only effective antifogging sustainability is not obtained, but also the dustproof effect on the outer surface of the house is deteriorated.

Examples of the antifogging agent used in the present invention include nonionic surfactants, cationic surfactants, anionic surfactants and amphoteric surfactants. Among these, ethylene polymers and Nonionic surfactants that are relatively compatible with the ethylene-propylene elastic copolymer are preferably used, but cationic surfactants and anionic surfactants are used for the purpose of modifying antifogging properties at the initial and low temperatures. A surfactant or the like is also used in combination. Nonionic surfactants include polyethylene glycol ethers such as polyethylene glycol nonyl phenyl ether and polyethylene glycol stearyl ether, polyethylene glycol stearate, polyethylene glycol carboxylic acid esters such as polyethylene glycol dilaurate, glycerin monostearate and sorbitan. Partial carboxylic acid esters of polyhydric alcohols such as monopalmitate and sorbitan tristearate, polyoxyethylene derivatives of sorbitan monostearate, and partial carboxylic acid esters of polyhydric alcohols such as polyoxyethylene derivative of sorbitan monolaurate Polyoxyethylene derivative, N, N-di- (hydroxyethyl) -laurylamide, N- (2-hydroxypropyl) -stear Amide derivatives such as amides. Examples of cationic surfactants include quaternary ammonium salts such as lauryl trimethyl ammonium chloride, N, N-dimethyl-N- (hydroxyethyl) -3- (stearoamido) -propyl ammonium nitrate, and 2-octadecyl- (hydroxyethyl). ) -2-imidazoline and other imidazoline derivatives, N, N-diethyl- (stearoamido) -methylamine hydrochloride, amines such as polyoxyethylene stearylamine and the like. As anionic surfactants, sodium lauryl phosphate, phosphates such as polyoxyethylene-sodium lauryl phosphate, sodium lauryl sulfate, sulfates such as sodium salt of sulfated oleic acid, sodium stearyl sulfonate, And sulfonic acid salts such as dodecylbenzenesulfonic acid triethanolamine salt and sodium salt of dioctylsulfosuccinate.

When an antifogging agent is added to the agricultural laminated film of the present invention, it is desirable to add it not only to the inner layer but also to the intermediate layer for the purpose of improving antifogging durability. In addition, it may be added to the outer layer, but bleed-out of the anti-fogging agent tends to cause contamination. The amount of the antifogging agent added to the inner layer is preferably in the range of 0.5 to 2% by weight. When it is less than 0.5% by weight, the antifogging property is not sufficiently expressed. Immediately after the film, the antifogging agent is remarkably transferred to the surface, causing problems such as stickiness and deterioration of transparency. The amount of the antifogging agent added to the intermediate layer is 1 to 5% by weight.
When the content is less than 1% by weight, the antifogging sustainability is not sufficient, and when it exceeds 5% by weight, the migration of the antifogging agent to the surface becomes remarkable immediately after the film formation, resulting in stickiness and stickiness. Poor transparency becomes a problem.

In the present invention, the inorganic filler is added to the resin layers B and B'in the range of 0.5 to 20% by weight for the purpose of improving the tear strength. If it is less than 0.5% by weight, the effect of improving the tear strength is difficult to obtain, and if it exceeds 20% by weight, the physical properties of the film are inferior or the internal haze of the film is increased, which is not preferable.

The shape of the inorganic filler is preferably spherical,
Those having an average particle size of about 0.1 to 10 μ are preferably used. If the average particle size is less than 0.1 μ, the workability is poor because it becomes bulky, and if it exceeds 10 μ, it is not preferable because the film may have holes or spots.

As the type of inorganic filler, silicon oxide,
Silicate compounds such as magnesium silicate, aluminum silicate and calcium silicate, aluminosilicate compounds such as calcium aluminosilicate, sodium aluminosilicate and potassium aluminosilicate, aluminate compounds such as alumina, sodium aluminate, potassium aluminate and calcium aluminate, carbonic acid One or more inorganic fillers selected from the group consisting of calcium, hydrotalcites represented by the general formula (1), lithium-aluminum composite hydroxide salt represented by the general formula (2), and the like can be given. General formula (1) M ²⁺ _1-x Al _x (OH) ₂ (A ⁿ⁻ ) _{x / n} · mH ₂ O (where M ²⁺ is 2 selected from the group consisting of magnesium, calcium and zinc) shows the valence metal ion, a ^n-represents an n-valent anion, _X and m are following condition, 0 _<X <
0.5, 0 ≦ m ≦ 2. General formula (2) [Al ₂ Li (OH) ₆ ] _n X · mH ₂₀ (wherein X is an inorganic or organic anion,
n is the valence of the anion X, and m is a number of 3 or less. )

The transparency of the agricultural laminated film varies depending on the type of the inorganic filler, and the closer the refractive index of the ethylene resin and the refractive index of the inorganic filler are, the less the decrease in transparency. General formula of (1)
Further, hydrotalcites represented by the general formula (2), lithium-aluminum composite hydroxide salt, aluminum silicate, aluminum hydroxide and the like are preferably used.

In the production of the laminated film according to the present invention, various additives such as a heat retaining agent, an antifog agent, a heat stabilizer, an antioxidant, a hindered amine weather resistance improver, an ultraviolet absorber and a slip agent are added according to a conventional method. Agents may be added.

The agricultural laminated film of the present invention can be produced by known laminating techniques such as coextrusion molding by the inflation method or T-die method, wet lamination, dry lamination, hot melt lamination, extrusion coating lamination, etc. Co-extrusion molding by the inflation method or T-die method with excellent properties can be performed. Further, after the film is formed, the effect of exhibiting anti-fogging property may be improved by corona discharge treatment or the like.

The thickness of the agricultural laminated film of the present invention varies depending on the place of use, service life, etc., but is generally 0.05-0.
Those having a size of about 20 mm are preferably used. The thicknesses of the inner layer B and the outer layer B ′ are not particularly limited, and are determined by the required anti-fogging durability, flexibility, total thickness of the laminated film, and the like.

[0023]

EXAMPLES The present invention will be described below in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto. Examples and comparative examples are shown in the table, and the melt flow rate (MFR) is a value measured by the method specified in JIS-K-7210. Low temperature anti-fog property (10 ℃ method)
The film sample was fixed to the skylight of a water bath with a skylight of 10 degrees and 3 inches in diameter so that the inner layer surface of the film sample was on the lower side, and the water temperature was kept at 10 ° C and left in a constant temperature layer of 0 ° C for one day and night. , A (excellent because it has a uniform water film), B (the water film is slightly uneven but can be used),
It was evaluated in 3 ranks of C (dropped and cannot be actually used). Hot water anti-fog persistence (45 ℃), the film sample is fixed so that the inner layer surface of the film sample is on the skylight of a water bath having a 10-degree inclination and a 3-inch diameter skylight,
While keeping the water temperature at 45 ° C, the sample was left in a constant temperature room at 23 ° C, and the period until the antifogging property of the inner surface was maintained was evaluated. The dust resistance was evaluated by fixing the film sample to a frame of 30 cm in length × 50 cm in width × 30 cm in height in an outdoor field, and measuring the haze value of the film sample on the side of the frame after 3 months. Further, the transparency was measured by measuring the haze value and the total light transmittance of the film immediately after the film formation using a haze meter in accordance with JIS-K-7105 and used as a measure of the transparency. The tear strength and the tensile strength were measured according to JIS-K-6781. Regarding the workability of spreading, A (excellent), for the problem of poor workability due to stickiness when spreading on the house,
B (some problems but can be used), C (cannot be used)
It was evaluated by 3 ranks.

Example 1 MFR (190 ° C., 2.16 kgf) using a three-layer inflation film molding apparatus (rip clearance 2 mm) capable of molding a three-kind three-layer film having one 65φ extruder and two 40φ extruders.
= 2.0 g / 10 min, density ρ = 0.95 g / cm ³ , vinyl acetate content =
15% by weight of ethylene-vinyl acetate copolymer as a main component, antifogging agent (trade name; KFG561, manufactured by Kao Corporation) 3% by weight,
As an inorganic filler, a hydrotalcite compound (trade name; DHT-4A, manufactured by Kyowa Chemical Co., Ltd.) 5% by weight, a fluorine-based fog preventive agent 0.15% by weight, a hindered amine-based weathering agent 0.2% by weight,
0.1% by weight of phenolic stabilizer, 0.1% by weight of phosphorus stabilizer
Into a 65φ extruder and the intermediate layer A
And MFR (190 ℃, 2.16kgf) = 0.45g / 10min, Mw / M
The main component is high-density polyethylene (manufactured by Maruzen Polymer Co., Ltd .; MZ9050) with n = 4.7 and a density of 0.945,
20% by weight MFR (230 ° C, 2.16 kgf) = 0.91 g / 10 min styrene-ethylene-butylene copolymer (Nippon Synthetic Rubber Co., Ltd. product name: Dynalon 4600P) as an elastic polymer, as an inorganic filler 1% by weight of synthetic hydrotalcite having an average particle size of 0.4 μm (trade name: DHT-4A-2, manufactured by Kyowa Chemical Industry Co., Ltd.),
A resin composition containing 0.2% by weight of a hindered amine-based weathering agent, 0.1% by weight of a phenolic stabilizer, and 0.1% by weight of a phosphorus-based stabilizer was charged into one 40φ extruder as an inner layer B, and MF was used.
R (190 ° C., 2.16 kgf) = 0.45 g / 10 minutes, Mw / Mn = 4.
7. High density polyethylene (trade name: MZ9050 manufactured by Maruzen Polymer Co., Ltd.) with a density of 0.945 as a main component, and MFR (230 ° C., 2.16 kgf) = 0.91 g / 10 min styrene-ethylene-as an elastic polymer. Butylene-based copolymer (manufactured by Nippon Synthetic Rubber Co., Ltd., trade name; Dynalon 4600P) 10% by weight, synthetic hydrotalcite with an average particle size of 0.4 μm as an inorganic filler (trade name, manufactured by Kyowa Chemical Industry Co., Ltd .; DHT -4A-2) A resin composition containing 1% by weight, 0.2% by weight of a hindered amine weathering agent, 0.1% by weight of a phenolic stabilizer, and 0.1% by weight of a phosphorus stabilizer is added to the other 40φ extruder to form an outer layer. B ', and an inner layer B (thickness 20μ) is laminated on the inner surface of the intermediate layer A (thickness 60μ), and an outer layer B' (thickness 20μ) is laminated on the outer surface.
The three-layer laminated film of was obtained at a blow ratio of 2.5.

Examples 2 to 4 Styrene-ethylene-butylene type copolymer (Brand name: Dynalon 4600P manufactured by Nippon Synthetic Rubber Co., Ltd.) is used for the inner layer B.
5, 10, 40% by weight, styrene-ethylene-in the outer layer B '
Except that the butylene type copolymer (trade name of Nippon Synthetic Rubber Co., Ltd .; Dynaron 4600P) is 0, 5 and 20% by weight, respectively.
It carried out similarly to Example 1.

Examples 5 to 10 Hydrotalcite compounds (trade name: DHT-4A, manufactured by Kyowa Chemical Co., Ltd.) were used as inorganic fillers added to the inner layer B and the outer layer B ', respectively, 0, 0.5, 5.0, 10, 20. Was carried out in the same manner as in Example 1 except that the amount was 30% by weight.

Example 11 Instead of a hydrotalcite compound (trade name; DHT-4A, manufactured by Kyowa Chemical Co., Ltd.) as an inorganic filler to be added to the inner layer B and the outer layer B ', a lithium aluminum complex hydroxide salt (commercial item) Name: 1% by weight of Miss Carrack, manufactured by Mizusawa Chemical Co., Ltd.
Example 1 was repeated except that

Example 12 In the inner layer B and the outer layer B ', an ethylene-propylene elastic copolymer (Moonie) was used instead of the styrene-ethylene-butylene copolymer (trade name: Dynaron 4600P manufactured by Nippon Synthetic Rubber Industry Co., Ltd.). Viscosity 24ML _{1 + 4} (100 ℃), propylene content 26
The same procedure as in Example 1 was carried out except that weight%, density 0.86 g / cm ³ , trade name; EP02P, manufactured by Nippon Synthetic Rubber Co., Ltd. were used.

Example 13 MFR (190 ° C., 2.16 kgf) containing 30% by weight of an elastic polymer EP02P (manufactured by Nippon Gosei Gum Kogyo Co., Ltd.) in place of the ethylene-vinyl acetate copolymer in the intermediate layer A = 2.5g / 10min, density ρ
Was carried out in the same manner as in Example 1 except that an ethylene-1-hexene copolymer of 0.92 g / cm ³ was used.

Comparative Example 1 Styrene-ethylene-added to the inner layer B and the outer layer B '.
The same procedure as in Example 1 was performed except that the amount of the butylene copolymer (trade name of Nippon Synthetic Rubber Co., Ltd .; Dynaron 4600P) was 20% by weight.

Comparative Examples 2 to 4 Styrene-ethylene-butylene type copolymer (trade name of Nippon Synthetic Rubber Co., Ltd .; Dynaron 4600P) was used in the inner layer B at 0, 20, 50.
% By weight, styrene-ethylene-butylene-based copolymer in outer layer B ′ (trade name of Nippon Synthetic Rubber Co., Ltd .; Dynalon 460)
The same procedure as in Example 1 was carried out except that 0P) was 10, 30, and 30% by weight, respectively.

Comparative Example 5 MFR (190 ° C., 2.16 kgf) = 3.0 g / inner layer B and inner layer B ′
10 minutes, density ρ = 0.95 g / cm ³ , vinyl acetate content = 5% by weight
Synthetic hydrotalcite (trade name: DHT-4A-2, manufactured by Kyowa Chemical Industry Co., Ltd.) with an ethylene-vinyl acetate copolymer as a main component and an average particle size of 0.4 μm as an inorganic filler, hindered amine type 0.2 wt% weather resistance agent, phenolic stabilizer
The same procedure as in Example 1 was carried out except that a resin composition containing 0.1% by weight and 0.1% by weight of a phosphorus-based stabilizer was used.

Comparative Example 6 MFR (190 ° C., 2.16 kgf) = 2.5 g / inner layer B and inner layer B ′
10 minutes, the main component is ethylene-1-hexene copolymer having a density ρ = 0.92 g / cm ³ , and the average particle size of the inorganic filler is
0.4 μm synthetic hydrotalcite (Kyowa Chemical Industry Co., Ltd. product name; DHT-4A-2) 1% by weight, hindered amine weathering agent 0.2
% By weight, phenolic stabilizer 0.1% by weight, phosphorus stabilizer
Example 1 except that a resin composition containing 0.1% by weight was used.
It carried out similarly to.

Comparative Example 7 The same procedure as in Example 1 was carried out except that the inner layer B and the outer layer B ′ did not use a styrene-ethylene-butylene copolymer (trade name of Nippon Synthetic Rubber Co., Ltd .; Dynaron 4600P). . The obtained agricultural laminated film had a low-temperature anti-fog property of C, a high-temperature anti-fog durability of 5 days, a total light transmittance of 92%, and a haze value of 28.
0%, dust resistance 32.1%, spreading workability was A, and there was a problem in low temperature antifogging property, high temperature antifogging property and spreading workability, and it could not be put to practical use.

[0035]

The agricultural laminated film of the present invention has at least one inner layer and an intermediate layer in which an inner layer and an outer layer having a high density polyethylene as a main component are laminated on the inner and outer surfaces of an intermediate layer having an olefin resin as a main component. In the constitution in which the antifogging agent is added to the above, by adding a specific amount of the elastic copolymer to the inner and outer layers, the antifogging persistence is long, and excellent dust resistance can be exhibited, and an inorganic filler is added. By doing so, it is possible to prevent a reduction in tear strength when using high-density polyethylene, and also a good balance of vertical and horizontal tear strength, while making the most of the characteristics of high-density polyethylene such as scratch resistance and toughness, such as in houses and tunnels. It can be suitably used as an agricultural coating material.

[0036]

[Table 1]

[0037]

[Table 2]

[0038]

[Table 3]

[0039]

[Table 4]

Claims (3)

[Claims] 1. An intermediate layer A containing an olefin resin as a main component, and a high-density polyethylene having a density of 0.94 to 0.97 g / cm ³ as a main component on the inner surface of the intermediate layer A and having an elastic copolymer content X1 of 5. <Inner layer B having a content of X1 ≤ 40% by weight is laminated, and the content X2 of the elastic copolymer mainly composed of high density polyethylene having a density of 0.94 to 0.97 g / cm ³ is 0 ≤ X2 <on the outer surface of the intermediate layer A. X
An agricultural laminated film having a structure in which 1% by weight of an outer layer B ′ is laminated, and at least one of an intermediate layer A and an inner layer B contains one or more antifogging agents. 2. The high-density polyethylene has a melt flow rate (190 ° C., 2.16 kgf) of 0.1 to 5.0 g / 10 minutes and a ratio Mw / Mn of weight average molecular weight Mw to number average molecular weight Mn of 3
The agricultural laminated film according to claim 1, which is in the range of 10 to 10. 3. An inorganic filler is contained in the inner layer B and the outer layer B '.
The agricultural laminated film according to claim 1, which contains 0.5 to 20% by weight.