JP3071904B2 - Agricultural laminated resin film - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agricultural film which is excellent in weatherability, dripability, heat retention and transparency.

[0002]

2. Description of the Related Art Agricultural films used for cultivation of houses and tunnels include branched low-density polyethylene (LD).
Soft plastics having a thickness of about 30 to 200 μm are mainly used as base resins such as PE), ethylene / vinyl acetate copolymer (EVA), and linear low density polyethylene (LLDPE). Important performances required for these resins as agricultural films include weather resistance, dripability, heat retention and transparency. In recent years, due to the problem of increasing the cost of farm work and the shortage of labor, there is a demand for the development of a film that can be used for a long time before the house is renewed.

[0003] First, with regard to weather resistance, various developments have been made in order to prevent deterioration of the film and obtain a long-life and high-performance agricultural film. The film is deteriorated by ultraviolet rays in sunlight in the presence of oxygen in the air, and its strength and elongation are reduced to cause breakage. To improve this, various weathering stabilizers (deterioration inhibitors) have been developed and used in films.

The weathering stabilizers are roughly classified into ultraviolet absorbers and light stabilizers. In recent years, light stabilizers are more effective for thinner agricultural films, and have a large improvement effect. Since the addition amount can be reduced and the cost can be reduced, it has become the mainstream of the weather resistance stabilizer. Conventionally, nickel-based compounds have been mainly used as the light stabilizer, but recently many hindered amine-based compounds have been developed as light stabilizers. It has become the mainstream of weathering stabilizers.

[0005] Next, in terms of the dropping property, the dropping means that the waterdrops adhering to the inner surface of the film of the house are treated as a water film. It increases the amount of sunlight as much as possible, raises the internal temperature and temperature, promotes photosynthesis of plants, promotes healthy crop growth, and suppresses the occurrence of diseases. As a method of the droplet treatment so far, there is a method of kneading a droplet into a resin for film formation, a method of kneading a droplet into a film and forming a film, and a commonly used droplet is,
For example, nonionic, anionic and cationic surfactants are used.

As for the heat retention, the temperature in the house at night, especially during dawn, decreases as the outside air temperature decreases. Average temperature x number of days: 2500-300 for rice
0 ° C.) is one of the important performances of agricultural films, since it greatly affects the final yield and harvest time of agricultural products. As a heat retaining agent used in agricultural films, silica powder (JP-B-47-138) is used.
No. 53), magnesium compound (JP-B-3-50791)
No.), hydrotalcite (JP-B-62-31744)
), A water-absorbing resin (Japanese Unexamined Patent Publication No. 61-8 / 1986)
1446) or an ethylene / vinyl alcohol copolymer (Japanese Patent Application Laid-Open No. Sho 55-118894). In particular, hydrotalcite is a substance with a good balance of heat retention and transparency, because the performance as a heat retention agent and the transparency deterioration of the film caused by adding an inorganic filler are less likely to occur compared to others. It is known that there is.

Needless to say, transparency is indispensable for crops grown under sunlight, and agricultural films are preferably as transparent as possible.

[0008]

However, hindered amine light stabilizers for imparting weather resistance generally have a small molecular weight and easily escape from the film.
The effect as a weather resistance stabilizer cannot be maintained for a long time. In addition, hindered amine light stabilizers having an excellent light stabilizing effect are alkaline, and are used as insecticides sprayed for the purpose of controlling pests in crops in a house, such as organochlorine pesticides and organophosphorus pesticides. However, there is a problem that a chemical reaction occurs with an acidic substance generated when the compound is decomposed, and the effect as a weather resistance stabilizer is reduced.

As a method for solving this problem, Japanese Patent Application Laid-Open No. Sho 63-175 discloses that it is effective to use hydrotalcite as a neutralizing agent in combination with a hindered amine light stabilizer.
No. 072, however, since the hindered amine light stabilizer has a low molecular weight, escape from the film is inevitable and has not yet been solved. For this reason, none of the polyolefin-based agricultural films currently used that satisfy all of the above four properties required for agricultural films has been obtained.

[0010] The present invention provides an agricultural film excellent in four properties of heat retention, transparency, weather resistance and dripping.

[0011]

SUMMARY OF THE INVENTION We have been keen to improve these problems and to obtain a well-balanced agricultural film having good heat retention and transparency, and also excellent dripability and weather resistance. As a result of the study, the thermoplastic resin, ethylene-based copolymer having a hindered amine in the side chain, and containing hydrotalcites, by applying a dropping agent on the inner surface of the film, or by blending in the film It has been found that an agricultural film having a better weather resistance life, better dripability, and a better balance of performance with good heat retention and transparency than conventional agricultural films to which a light stabilizer has been added. Completed the invention.

[0012]

The first aspect of the present invention is to provide (A) an ethylene copolymer having a hindered amine in a side chain obtained by copolymerizing ethylene and a cyclic aminovinyl compound in a thermoplastic resin film. 0.05 in compound unit ratio
An outermost layer of a thermoplastic resin film containing up to 5% by weight;
(B) A thermoplastic resin film containing 0.5 to 20% by weight of hydrotalcites, and having an innermost layer in which a dripping agent is applied to the film surface or blended in the film. An object of the present invention is to provide a laminated resin film for agricultural use having a drip property comprising a multilayer resin film having a structure.

A second aspect of the present invention is to provide an ethylene copolymer having a hindered amine in a side chain obtained by copolymerizing ethylene and a cyclic aminovinyl compound in a proportion of the vinyl compound unit in the thermoplastic resin film. A thermoplastic resin film outermost layer containing 0.05 to 5% by weight, (C) a thermoplastic resin film intermediate layer containing 0.5 to 20% by weight of hydrotalcites, and (B ') a dropping property. It is intended to provide an agricultural laminated resin film comprising three or more laminated resin films having an innermost resin film layer.

[0014]

DETAILED DESCRIPTION OF THE INVENTION

(Resin for film) The thermoplastic resin used in the present invention includes:
Polyolefins such as LDPE, EVA, LLDPE, and the like are suitable, and they are generally used in large amounts as agricultural films.

(Ethylene Copolymer Having Hindered Amine in Side Chain) The ethylene copolymer having a hindered amine in the side chain used in the present invention includes ethylene (a) and a cyclic compound represented by the following general formula (I). Amine vinyl compound (b)

[0016]

Embedded image (Wherein R ₁ and R ₂ represent a hydrogen atom or a methyl group;
₃ is a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, respectively), wherein the ratio of (b) to the sum of (a) and (b) is less than 1 mol%, preferably 0.
When the MFR of the copolymer is 0.1 to 2
An ethylene copolymer having a flow rate of 00 g / 10 minutes is used.

Among them, those in which the proportion of (b) independently present in the copolymer is 83% or more based on the total amount of (b) are preferred. The following are typical examples of the vinyl compound represented by the above general formula (I). 4-acryloyloxy-2,2,6,6-tetramethylpiperidine 4-acryloyloxy-1,2,2,6,6-pentamethylpiperidine 4-acryloyloxy-1-ethyl-2,2,6,6
-Tetramethylpiperidine 4-acryloyloxy-1-propyl-2,2,6
6-tetramethylpiperidine 4-acryloyloxy-1-butyl-2,2,6,6
-Tetramethylpiperidine 4-methacryloyloxy-2,2,6,6-tetramethylpiperidine 4-methacryloyloxy-1,2,2,6,6-pentamethylpiperidine 4-methacryloyloxy-1-ethyl-2,2 6,
6-tetramethylpiperidine 4-methacryloyloxy-1-butyl-2,2,6
6-tetramethylpiperidine 4-critonoyyloxy-2,2,6,6-tetramethylpiperidine 4-critonoyyloxy-1-propyl-2,2,6
6-Tetramethylpiperidine The ethylene copolymer having the hindered amine in the side chain is produced by a high-pressure radical copolymerization method described in Japanese Patent Application No. 2-192970.

The proportion of the structural unit based on the cyclic amine vinyl compound in the thermoplastic resin film of the outermost layer (A) is 0.05 to 5% by weight, preferably 0.1 to 4% by weight. If it is less than 0.05% by weight, the effect of improving weather resistance is small, and if it exceeds 5% by weight, further improvement in weather resistance cannot be expected, which is economically disadvantageous. The reason that the ethylene-based copolymer having a hindered amine in the side chain is concentrated and contained in the outermost layer of the laminated resin film (the side where the agricultural film is exposed to the weather and sunlight) is a large content up to a certain concentration. This is because the effect of improving the weather resistance is greater, so that the outermost layer is preferably concentrated and contained as a multilayer structure in terms of the weather resistance effect and the economic efficiency.

(Hydrotalcites) In the present invention, the hydrotalcites (hereinafter simply abbreviated as hydrotalcites) blended in the resin film of the innermost layer (B) or the intermediate layer (C) are represented by a general formula (II)

[0020]

Embedded image

(Where M ²⁺ represents a divalent metal ion selected from the group consisting of Mg, Ca and Zn, and x
And m satisfy the condition of the following expression. 0 <x <0.50 ≦ m ≦ 2) The compound represented by the formula:

Examples of the n-valent anion represented by A ^n- in the above formula include Cl ⁻ , Br ⁻ , I ⁻ , NO ₃ ^2- ,
ClO ₄ ⁻ , SO ₄ ²⁻ , CO ₃ ²⁻ , SiO ₃ ²⁻ , HPO
₄ ^2-, HBO ₃ ^2-, can be exemplified such anions PO ₄ ^2-like. Specific examples thereof include DHT-4A, DHT-4SA, Alkamizer 1, and Alkamizer 2 manufactured by Kyowa Chemical Industry Co., Ltd.

The amount of the hydrotalcite to be added is determined in the resin film of the innermost layer (B) and / or the intermediate layer (C).
It is 0.5 to 20% by weight, preferably 1 to 10% by weight. The average particle size of the hydrotalcite is 5 μm or less, preferably 0.05 to 2 μm. If the amount deviates from the above range and is too small, the effect of improving the weather resistance is weak. Also, if the amount is too large or the average particle size is too large, the strength of the film may be reduced or the transparency may be impaired. (When hydrotalcite is blended on both sides of the innermost layer and the intermediate layer, it is blended so as to be 20% by weight or less of the resin content of both layers.)

(Drip agent) The droplet agent used in the present invention comprises:
0.1 to 5% by weight is added to the thermoplastic resin film of the innermost layer (B) or (B '), or applied to the surface of the innermost resin film. When it is added to the innermost resin film, if it is less than 0.1% by weight, the effect as a dropping agent is weak. On the other hand, if it exceeds 5% by weight, the film surface becomes sticky, dust and the like adhere, and transparency is impaired.

As the dropping agent to be added to the film, a commonly used dropping agent can be used. For example, nonionic, anionic, and cationic surfactants are used. Specifically, polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene nonyl phenyl ether, polyethylene glycol monopalmitate, polyethylene glycol monostearate, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monopalmiate Tate, glycerin monolaurate, glycerin monopalmitate, glycerin monostearate, glycerin monooleate, pentaerythritol monolaurate, sorbitan monopalmitate, sorbitan monobehenate, sorbitan distearate, diglycerin monooleate, triglycerin geo Rate, sodium lauryl sulfate, sodium dodecylbenzene sulfonate, butyl naphthalene sulfone Sodium, cetyltrimethylammonium chloride, alkyldimethylbenzylammonium chloride, dodecylamine hydrochloride, lauryl lauramide ethyl phosphate, triethylcetylammonium iodide, oleylaminodiethylamine hydrochloride, basic pyridinium salt of dodecylpyridinium sulfate, etc. can give.

Among them, particularly preferred are esters of fatty acids having 14 to 22 carbon atoms and polyhydric alcohols such as sorbitan, sorbitol, glycerin, polyglycerin and propylene glycol or alkylene oxide adducts thereof. Nonionic surfactants. The dropping agent used for coating is mainly composed of an inorganic hydrophilic colloid substance and a hydrophilic organic compound.
5432, JP-B-63-45717, JP-B 64-
No. 2158 and the like.

Examples of the inorganic hydrophilic colloidal substance include colloidal silica, colloidal alumina, colloidal F
e (OH) ₂ , colloidal Sn (OH) ₄ , colloidal TiO ₂ , colloidal BaSO ₄ and colloidal lithium silicate. Particularly preferred materials are colloidal silica and colloidal alumina.

Examples of the hydrophilic organic compound include various surfactants (nonionic, anionic, and cationic) and a copolymer containing 0.1 to 40% by weight of a hydroxyl-containing vinyl monomer component or a copolymer thereof. Examples thereof include partially or completely neutralized products and sulfonic acid group-containing polyester resins. As the hydroxyl group-containing vinyl monomer, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2
-Hydroxyethyl methacrylate is available, and as a vinyl monomer copolymerizable therewith, alkyl acrylate, alkyl methacrylate, styrene,
Acrylonitrile, acrylic acid and the like can be used.

The amount of the dripping agent applied to the resin film of the innermost layer is 0.05 to 5 g / m ² , preferably 0.1 to ² g / m ² .
g / m ² . Coating amount less prolonged effect of dripping property is less than 0.05 g / m ^2, undesirable transparency of the laminated resin film is impaired and exceeds 5 g / m ^2. The method of applying the dropping agent may be any of various roll printing methods, dipping methods, spraying methods, and the like. The coating can be carried out by in-line coating performed subsequently after film formation, outline coating performed in a rewinding step after film formation / winding, or by spraying and coating the inner surface of the film after stretching.

As a method of adding a dropping agent, a method of coating on the film surface is more preferable than a so-called kneading method of adding into a film because the effect of the dropping effect is better. The thickness of all layers of agricultural laminated resin film is 0.03 ~
It is 0.3 mm, preferably 0.05 to 0.2 mm.
If it is too thin, the strength of the film becomes insufficient, which is not preferable. On the other hand, if it is too thick, the cost increases, which is not preferable. In the present invention, the reason that the ethylene copolymer having hindered amine in the side chain and the hydrotalcite are blended in separate layers is that when both are contained in the outermost layer (A), the transparency of the laminated resin film is different. Is slightly lower than that blended in the layer of

The laminated resin film for agriculture of the present invention comprises a thermoplastic resin film outermost layer (A) containing an ethylene copolymer having a hindered amine in a side chain, and a drip-resistant resin containing hydrotalcite. It may be used as a two-layer film in which both layers of the film innermost layer (B) are laminated, or (A) layer / intermediate layer (C) /
It may be used as a multilayer film of three or more layers (B). Further, (A) layer / intermediate layer containing hydrotalcite (C) / innermost layer of resin film having dripping properties (B ′) [hydrotalcite does not contain (B ′) layer], (A) It may have a three-layer structure of layer / (C) layer / (B) layer.

The laminated resin film is a two-layer film (A) /
In the case of (B), the outermost layer (A) has a thickness of 5 to 250 μm.
m, preferably a thickness of 5 to 250 μm (B)
m. In the case of a three-layer film, the outermost layer (A) has a thickness of 5 to 200 μm, the intermediate layer has a thickness of 5 to 200 μm, and the innermost layer (B) or (B ′) has a thickness of 5 to 50 μm. Further, the film of the present invention may contain a wax, an antioxidant, an antistatic agent, an ultraviolet absorber, a lubricant, an inorganic filler, and the like, if necessary.

[0033]

Now, the present invention will be described in detail with reference to Examples and Comparative Examples. Weather resistance in Examples and Comparative Examples,
The methods for measuring the dripping properties, heat retention, and transparency are shown below.

<Weather resistance> The test film was 60 cm high,
It was attached to a 1.5 m long mini-house, and the weather resistance was examined. The evaluation method was as follows: The test piece was prepared by punching out the film in the transverse direction with a punching blade, and the elongation at break was measured with a shopper type tensile tester. The end point of the deterioration. Elongation at break (%) =

<Dripability> The test film was 60 cm high,
It was stuck to a 1.5 m long mini-house and the dropping property was examined. The evaluation method was to observe the change in the state of adhesion of water droplets on the inner surface of the film.
The point at which water droplets adhered was determined as the end point of the drip life.

<Heat insulation> The test film was 60 cm high,
It was attached to a 1.5 m long mini-house, and the inside temperature and outside temperature of the house at 4:00 am were measured, and the temperature difference was examined. This was performed for 10 days, and the average value was calculated.

<Transparency> The total light transmittance of the formed film was measured. The method was based on JIS K6714.

Example 1 Innermost layer (B) and outermost layer (A)
Is an ethylene-vinyl acetate copolymer having a vinyl acetate content of 3% by weight, and the intermediate layer (C) was synthesized using the ethylene-vinyl acetate copolymer having a vinyl acetate content of 15% by weight as a base resin by the following method. An ethylene copolymer having a hindered amine in the side chain and hydrotalcite (Kyowa Chemical Industry Co., Ltd., DHT-4A (trade name), average particle size: 0.4 μm) were blended as shown in Table 1, and inflation was performed. Method, a three-layer structure having a thickness of 100 μm (A15 μm)
m, C70 μm, B15 μm) and a lamination resin film having a width of 1800 mm, and the droplets obtained by the following production method were coated on the film at a coating speed of 8 m / min using a brush roll coater having a roll width of 2000 mm.

This was evaluated for the weather resistance life, the drip life, the heat retention and the transparency by the above-mentioned methods. Weather resistance life,
The evaluation of the drip life was started on October 30, 1985. The results of the evaluation are shown in Table 1.

<Method for Producing Ethylene Copolymer Having Hindered Amine in Side Chain> A stirred autoclave-type continuous reactor was used to dissolve 4- (ethylene) in ethylene and ethyl acetate.
Acryloyloxy-2,2,6,6-tetramethylpiperidine and tertiary butyl peroxypivalate dissolved in normal hexane as a catalyst were continuously supplied at a polymerization pressure of 2000 kg / cm ^{2 and a} polymerization temperature of 200.
Copolymerized at ℃.

The MFR of the obtained copolymer was 2.7 g / 1.
0 minutes, the content of 4-acryloyloxy-2,2,6,6-tetramethylpiperidine units is 3.0% by weight,
The proportion of the compound that exists independently is ¹³ C NMR
Was 85%.

<Production method of dropping agent (coating type)>
A dropping agent having an active ingredient concentration of 2% by weight, obtained by adding water to the active ingredient of (iii) and stirring and mixing. (I) Colloidal silica: 70% by weight (Catalyst Kasei Co., Cataloid S1-350) (ii) Silane derivative: 5% by weight (γ-ureidopropyltriethoxysilane) (iii) Nonionic surfactant: 25% by weight (poly) Oxyethylene (7 mol) oleate

Example 2 The basic blending was the same as in Example 1, except that only the blending amount of the ethylene-based copolymer having a hindered amine in the side chain was increased. Obtained and evaluated. Table 1 shows the results of the evaluation.

[Table 1]

Example 3 The basic composition was the same as that of Example 1, except that only the amount of the ethylene copolymer having a hindered amine in the side chain was reduced. Obtained and evaluated. Table 2 shows the results of the evaluation.

Example 4 The basic composition was the same as in Example 1, except that only the amount of hydrotalcite was increased, and a laminated resin film was obtained and evaluated in the same manner as in Example 1 except for the above.
Table 2 shows the results of the evaluation.

[Table 2]

Example 5 The basic composition was the same as in Example 1, except that only the amount of hydrotalcite was reduced, and the other steps were the same as in Example 1 to obtain and evaluate a laminated resin film. Table 3 shows the results of the evaluation.

<Example 6> The basic composition was the same as that of Example 1, the flow agent was changed to a kneading type (polyoxyethylene lauryl ether), and the other steps were the same as in Example 1 to obtain a laminated resin film. Obtained and evaluated. Table 3 shows the results of the evaluation.

[Table 3]

Example 7 The basic composition was the same as in Example 1, and a laminated resin film was obtained and evaluated in the same manner as in Example 1 except that the ethylene copolymer having a hindered amine in the side chain was removed from the innermost layer. did. Table 4 shows the results of the evaluation.

Example 8 An ethylene / vinyl acetate copolymer having a vinyl acetate content of 3% was used as the outermost layer resin, and an ethylene / vinyl acetate copolymer having a vinyl acetate content of 13% was used as the innermost layer resin. In addition, an ethylene copolymer having a hindered amine in the side chain in the outermost layer and hydrotalcite in the innermost layer as shown in Table 4, respectively, are mixed, and a two-layer film having a thickness of 100 μm and a width of 1800 mm is formed by an inflation film molding method. And evaluated in the same manner as in Example 1. Table 4 shows the results of the evaluation.

[Table 4]

Example 9 The same evaluation as in Example 1 was conducted, except that the dropping agent was changed to a kneading type (polyoxyethylene lauryl ether). Table 5 shows the results of the evaluation.

<Comparative Example 1> The basic blending was the same as in Example 1, except that only the blending amount of the ethylene-based copolymer having a hindered amine in the side chain was reduced.
A layer resin film was obtained and evaluated. The results of the evaluation are shown in Table 5.

[Table 5]

<Comparative Example 2> A three-layer resin film was obtained and evaluated in the same manner as in Example 1 except that the basic compounding was the same as in Example 1 except that only the amount of hydrotalcite was reduced. Table 6 shows the results of the evaluation.

Comparative Example 3 A three-layer film was obtained and evaluated in the same manner as in Example 1 except that the basic formulation was the same as that of Example 1 and neither the application type nor the kneading type was used. . Table 6 shows the results of the evaluation.

[Table 6]

<Comparative Example 4> The basic formulation was the same as that of Example 1, and instead of the ethylene copolymer having a hindered amine in the side chain, a hindered amine type light stabilizer bis (2,2,6,6- A three-layer film was obtained and evaluated in the same manner as in Example 1 except that tetramethyl-4-piperidine) sebacate was used. Table 7 shows the results of the evaluation.

[Table 7]

<Comparative Example 5> As a comparative object of the heat retaining property and the transparency, only the ethylene / vinyl acetate copolymer was used as a film, and the evaluation results of the heat retaining property and the transparency were shown in Table 8.
Shown in

[Table 8]

[0056]

As shown in the Examples, the outermost layer (A) containing the ethylene copolymer having the hindered amine of the present invention in the side chain, the hydrotalcites, and the dropping agent are used. The laminated resin film provided with the innermost layer (B) coated on the film inner surface or blended in the film has a weather resistance life, a drip property, a heat retention property and a heat resistance higher than that of a conventional agricultural film to which a light stabilizer is added. It is a better agricultural film in terms of transparency.

Continuation of the front page (72) Inventor Seiya Mori 1 Toho-cho, Yokkaichi-shi, Mie Mitsubishi Yokkaichi Co., Ltd. Yokkaichi Research Institute (56) References JP-A-5-112725 (JP, A) JP-A-4- 264140 (JP, A) JP-A-1-202446 (JP, A) JP-A-4-89812 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B32B 1/00-35 / 00 A01G 9/14-9/16 A01G 13/02-13/04 C08J 7/04

Claims (3)

(57) [Claims] 1. A thermoplastic resin film comprising: (A) an ethylene copolymer having a hindered amine in a side chain obtained by copolymerizing ethylene and a cyclic aminovinyl compound in an amount of 0. A thermoplastic resin film containing 0.5 to 5% by weight of a thermoplastic resin film, and (B) a thermoplastic resin film containing 0.5 to 20% by weight of hydrotalcite, and a droplet agent is applied to the film surface. Or a multi-layer resin film having an innermost layer incorporated in the film, and having a drip property, comprising a laminated resin film for agricultural use. 2. A thermoplastic resin film comprising (A) an ethylene-based copolymer having a hindered amine in a side chain obtained by copolymerizing ethylene and a cyclic aminovinyl compound in an amount of 0. An outer layer of a thermoplastic resin film containing 0.5 to 5% by weight, (C) an intermediate layer of a thermoplastic resin film containing 0.5 to 20% by weight of hydrotalcites, and (B ') a resin film having dripping properties An agricultural laminated resin film comprising three or more laminated resin films having an innermost layer. 3. An ethylene copolymer having a hindered amine in a side chain is composed of ethylene (a) and the following general formula (I). (Wherein R ₁ and R ₂ represent a hydrogen atom or a methyl group;
₃ represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, respectively), and is a copolymer with a cyclic aminovinyl compound (b) represented by the following formula (b) based on the sum of (a) and (b): 3. An ethylene copolymer having a ratio of less than 1 mol% and an MFR of the copolymer of 0.1 to 200 g / 10 min. Agricultural laminated resin film.