JP2002355937A - Agricultural polyolefin resin film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an agricultural polyolefin resin film having excellent film strength, transparency and film opening resistance. SOLUTION: In the agricultural polyolefin resin film having 3- to 5-layer structure, an inside layer at the time of inflation molding is constituted of a resin layer having 20 to 100 wt.% of a high-pressure process low-density polyethylene resin and 0 to 80 wt.% of a linear low-density polyethylene having a density of 0.900 to 0.930. At least, one of intermediate layers is constituted of a linear low-density polyethylene having a density of 0.860 to 0.920. An outside layer is constituted of a layer made of a polyolefin resin containing 0 to 20 wt.% of a vinyl acetate content, and the outside layer has a defogging coating film made of a silica sol and/or an alumina sol and a resin bonder.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyolefin resin film for agricultural use which is excellent in transparency and strength and is excellent in reversibility of a film used in house cultivation and tunnel cultivation.

[0002]

2. Description of the Related Art In recent years, tunnel cultivation, house cultivation, and the like have been actively performed, and accordingly, agricultural covering materials can be used for a long period of time. Agricultural films are demanded.

[0003] Linear low-density polyethylene is used to improve film strength. High-density polyethylene is inferior in transparency, and low-density polyethylene is used, or high-pressure method low-density polyethylene is blended. Was. However, if the linear low-density polyethylene having a low density is used for the inner layer at the time of inflation molding, the films are sticky to each other, resulting in poor reversibility, and blending high-pressure low-density polyethylene results in poor strength.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned drawbacks of agricultural polyolefin resin films, and has excellent film strength and transparency, and excellent film releasability. The inventors have found that a resin film can be obtained and completed the present invention.

[0005]

SUMMARY OF THE INVENTION The present invention relates to an agricultural polyolefin resin film having three to five layers.
The inner layer at the time of inflation molding has a high pressure method low density polyethylene resin of 20 to 100% by weight and a density of 0.900 to 0.90%.
A resin layer composed of 0 to 80% by weight of a linear low-density polyethylene having a density of 0.930, and at least one intermediate layer is composed of a layer composed of a linear low-density polyethylene having a density of 0.860 to 0.920. The outer layer has a vinyl acetate content of 0 to 2
A layer composed of 0% by weight of a polyolefin resin,
An agricultural polyolefin resin film provided with an antifogging coating comprising silica sol and / or alumina sol and a resin binder on the outer layer. At least one other layer of the intermediate layer is composed of a layer made of a polyolefin resin having a vinyl acetate content of 5 to 20% by weight, preferably 10 to 20% by weight. It is preferable because it becomes a resin film.

Hereinafter, the present invention will be described in detail. In the agricultural polyolefin resin film of the present invention, the resin used for the inner layer at the time of inflation molding is a high-pressure low-density polyethylene resin of 20 to 100% by weight and a linear low-density of 0.900 to 0.930 in density. Polyethylene 0
It is composed of a resin layer consisting of 80% by weight. If the amount of the linear low-density polyethylene exceeds 80% by weight, the transparency and the film releasability deteriorate, and the density becomes 0.900%.
If a large amount of the linear low-density polyethylene less than the above is blended, stickiness occurs, and if the density exceeds 0.930, the transparency becomes poor, which is not preferable. In addition, a medium-density or high-density polyethylene can be blended in this layer in a range of less than 20% by weight. In this range, there is an effect that the strength can be increased without impairing the transparency.

[0007] In the agricultural polyolefin resin film of the present invention, the density excellent in strength is 0.860 to 0.9.
20 linear low-density polyethylenes in at least one of the intermediate layers.
By using it for the layer, an agricultural polyolefin resin film having excellent film strength and transparency without affecting the film reversibility can be obtained. When the density of the linear low-density polyethylene is more than 0.920, the transparency becomes poor. When the density is less than 0.860, a flow mark easily appears on the film, resulting in poor film-forming stability.

[0008] In the four-layer or five-layer agricultural polyolefin resin film of the present invention, at least one other of the intermediate layers has a vinyl acetate content of 5 to 20% by weight, preferably 10 to 20% by weight. It is preferable to form a layer made of the polyolefin resin because it can impart flexibility to the film. This polyolefin-based resin is composed of an ethylene-vinyl acetate copolymer alone or a mixture thereof with a low-density polyethylene. When the vinyl acetate content is less than 5% by weight, the effect of imparting flexibility is low, If the vinyl content exceeds 20% by weight, the film-forming processability in inflation molding is inferior, which is not preferable.

Further, in the agricultural polyolefin resin film of the present invention, the outer layer has a vinyl acetate content of 0 to 10.
It is composed of a layer composed of 20% by weight of a polyolefin resin, and is subjected to surface treatment such as corona discharge treatment, so that the outer layer has excellent adhesion to an antifogging coating film composed of silica sol and / or alumina sol and a resin binder. By using the surface on which the anti-fog coating film is formed as the inner surface of an agricultural house, anti-fog properties can be exhibited for a long period of time. This polyolefin resin is composed of an ethylene-vinyl acetate copolymer and / or a high-pressure low-density polyethylene. If the vinyl acetate content exceeds 20% by weight, the film formation stability in inflation molding is inferior, and therefore it is not preferable. As the resin binder used for the anti-fog coating film, an aqueous resin binder such as a urethane resin, an acrylic resin, or an acryl-modified urethane resin is preferable, and silica sol and / or alumina sol exhibiting anti-fog performance are fixed to the outer layer of the film. Anything that can be done is acceptable.

In each layer of the agricultural polyolefin resin film of the present invention, various additives and other polyolefin resins can be blended within a range that does not impair the performance of the film. For example, as an inorganic warming agent, an oxide,
Hydroxides, carbonates, silicates and composites thereof. Specifically, talc, hydrotalcites, mica, zeolite, magnesium carbonate, aluminum hydroxide, lithium-aluminum composite hydroxide salt, zirconium phosphate, lithium-magnesium-aluminum composite hydroxide condensed silicate, etc. No. They are,
One type or a combination of two or more types can be used. The size of these inorganic fillers is 0.01 to 10 μm
m, preferably about 0.1 to 5 μm.

As the ultraviolet absorber, 2-hydroxy-
4-octoxybenzophenone, 2-hydroxy-4-
Methoxybenzophenone, 2,2'-dihydroxy-4
Benzophenones such as -methoxybenzophenone, 2,2 ', 4,4'-tetrahydroxybenzophenone; 2
-(2'-hydroxy-5'-methylphenyl) benzotriazole, 2- (2'-hydroxy-5'-ter
t-butylphenyl) benzotriazole, 2- (2 ′
Benzotriazoles such as -hydroxy-3'-methyl-5'-tert-butylphenyl) benzotriazole and 2- (2'-hydroxy-5'-tert-butylphenyl) -5-chlorobenzotriazole, as well as saltyl Acid-based compounds may be mentioned.

Examples of the hindered amine-based light stabilizer include those described in JP-A-1-197543 and JP-A-2-30529. Specific examples of commercially available compounds include TINUVIN770. ,
TINUVIN 780, TINUVIN 144, TIN
UVIN371, TINUVIN622LD, CHIM
Assorb 944 (all made by Ciba Geigy), MA
RK LA-57, MARK LA-62, MARK
LA-63, MARK LA-67, MARKLA-6
8 (all manufactured by Asahi Denka Co., Ltd.) and the like.

In addition to these additives, various additives such as a lubricant, a heat stabilizer, an antioxidant, a coloring agent, an antistatic agent and a fungicide can be contained as required. Lubricants include polyethylene wax, fatty acid amide, stearic acid, etc., heat stabilizers, and antioxidants include metal salts of carboxylic acids, chelators such as phenolic antioxidants and organic phosphites. No.

Pellets premixed with the resin composition of each layer containing the above-mentioned additives and the like and master pellets having a high concentration are used and supplied to each extruder of a three-layer to five-layer inflation molding machine to form a laminated film. To manufacture. After the surface of the film is treated by a discharge treatment or the like on the outer layer of the film, an aqueous antifogging agent comprising silica sol and / or alumina sol and a resin binder is applied and dried to form an antifogging coating film. The thickness of the agricultural polyolefin resin film is in the range of 50 μm to 250 μm, and preferably in the range of 75 μm to 200 μm.

[0015]

Next, the present invention will be described in more detail by way of examples. The evaluations in the examples and comparative examples are as follows.
This was performed as follows. (1) Transparency: After the produced agricultural polyolefin resin film was stored in a constant temperature room at 40 ° C. and a humidity of 60% for 2 weeks, a haze value (unit:%) was measured with a haze meter (Suga Test Machine). Was evaluated according to the following criteria. ：: less than 25% Δ: 25% or more, less than 30% ×: 30% or more

(2) Film strength: The Elmendorf tear strength of the produced agricultural polyolefin resin film was measured and evaluated according to the following criteria. ：: 20 N or more Δ: 15 N or more, less than 20 N ×: less than 15 N

(3) Film reversibility: A tubular polyolefin resin film for agricultural use manufactured by inflation molding is wound up in a roll form, stored at room temperature for 2 weeks, and then the end is rewound from the roll to form a tube. During this time, air was injected, the state of peeling of the film was visually observed, and evaluated according to the following criteria. ：: The film is stably peeled over the entire width. Δ: Some parts cannot be peeled off. X: Almost no peeling.

Example 1 Using a 5-layer inflation molding machine, the following A (inner layer), B (middle layer), C (middle layer), D (middle and outer layer), and E (outer layer) Feeding the composition to each extruder,
A five-layer film having a thickness of 150 μm and a width of 10 m (thickness of each layer is 30 μm) is manufactured, and after the outer layer of the film is subjected to corona discharge treatment, an aqueous anti-fog agent comprising silica sol and an acrylic urethane resin binder is applied. The resultant was dried to form an anti-fog coating film, thereby obtaining an agricultural polyolefin resin film having five layers with the anti-fog coating film. The evaluation is shown in Table 1. A: High-pressure low-density polyethylene (manufactured by Nippon Unicar,
"NUC-8133") 100 parts by weight, lubricant (talc)
0.2 parts by weight, B and D: an ethylene-vinyl acetate copolymer having a vinyl acetate content of 15% ("FB-812" manufactured by Nippon Unicar Co., Ltd.)
100 parts by weight, 10 parts by weight of hydrotalcite ("Alkamizer DHT-4A" manufactured by Kyowa Chemical Industry Co., Ltd.), C: linear low density polyethylene (manufactured by Idemitsu Petrochemical Co., Ltd., "0
138N ", density 0.916) 100 parts by weight, hydrotalcite (manufactured by Kyowa Chemical Industry Co., Ltd.," Alcamizer DH "
T-4A ") 10 parts by weight, E: 100 parts by weight of an ethylene-vinyl acetate copolymer (manufactured by Tosoh Corporation," 7B54A ") having a vinyl acetate content of 5%, and a hindered amine is added to the composition of each layer. 0.5 parts by weight of a light stabilizer (TINUVIN 622LD) and a benzophenone ultraviolet absorber ("SS-102", manufactured by Cipro Kasei Co., Ltd.)
0.1 part by weight was blended.

Example 2 In Example 1, the following A (inner layer) and B
(Middle inner layer), C (intermediate layer), D (middle / outer layer), E (outer layer), except that the composition of Example 1 was used, except that a four-layer agricultural polyolefin system with an antifogging coating film was used. A resin film was manufactured. The evaluation is shown in Table 1. A: High-pressure low-density polyethylene (manufactured by Tosoh Corporation, “LD1
76R ") 100 parts by weight, 0.2 parts by weight of lubricant (talc), B and C: an ethylene-vinyl acetate copolymer having a vinyl acetate content of 15% (" FB-812 "manufactured by Nippon Unicar Co., Ltd.)
100 parts by weight, 10 parts by weight of hydrotalcite (manufactured by Kyowa Chemical Industry Co., Ltd., “Alkamizer DHT-4A”), D: metallocene catalyst-based linear low-density polyethylene (manufactured by Mitsui Chemicals, “SP-1520”, density) 0.915) 10
0 parts by weight, hydrotalcite (Kyowa Chemical Industry Co., Ltd.,
"Alkamizer DHT-4A") 10 parts by weight, E: 100 parts by weight of an ethylene-vinyl acetate copolymer having a vinyl acetate content of 5% ("7B54A", manufactured by Tosoh Corporation), and the composition of each layer Contains 0.5 parts by weight of a hindered amine light stabilizer (TINUVIN 371),
The three-layer composition of B, C and D contains a benzophenone-based ultraviolet absorber ("SS-102", manufactured by Cipro Kasei Co., Ltd.).
1 part by weight was blended.

Example 3 In Example 1, the following A (inner layer) and B
(Middle / Inner Layer), C (Intermediate Layer), D (Middle / Outer Layer), E (Outer Layer) In the same manner as in Example 1, except that a composition of 5 layers with an antifogging coating film was used. A resin film was manufactured. The evaluation is shown in Table 1. A: High-pressure low-density polyethylene (manufactured by Tosoh Corporation, “LD1
76R ") 25 parts by weight, 75 parts by weight of a metallocene catalyst-based linear low-density polyethylene (manufactured by Mitsui Chemicals, Inc.," SP-2320 ", density 0.923), 0.2 parts by weight of a lubricant (talc), B and D : Ethylene-vinyl acetate copolymer having a vinyl acetate content of 15% (“FB-812”, manufactured by Nippon Unicar Co., Ltd.)
100 parts by weight, 10 parts by weight of hydrotalcite (manufactured by Kyowa Chemical Industry Co., Ltd., “Alkamizer DHT-4A”), C: metallocene catalyst-based linear low-density polyethylene (manufactured by Mitsui Chemicals, “SP-1520”, density) 0.915) 10
0 parts by weight, hydrotalcite (Kyowa Chemical Industry Co., Ltd.,
"Alkamizer DHT-4A") 10 parts by weight, E: 100 parts by weight of an ethylene-vinyl acetate copolymer having a vinyl acetate content of 5% ("7B54A", manufactured by Tosoh Corporation), and the composition of each layer And 0.5 parts by weight of a hindered amine light stabilizer (TINUVIN 622LD) and a benzophenone ultraviolet absorber ("SS-102", manufactured by Cipro Kasei Co., Ltd.)
0.1 part by weight was blended.

Example 4 In Example 1, the following A (inner layer) and B
(Middle / Inner Layer), C (Intermediate Layer), D (Middle / Outer Layer), E (Outer Layer) In the same manner as in Example 1, except that a composition of 5 layers with an antifogging coating film was used. A resin film was manufactured. The evaluation is shown in Table 1. A: High-pressure low-density polyethylene (manufactured by Tosoh Corporation, “LD1
76R ") 50 parts by weight, 50 parts by weight of a metallocene catalyst-based linear low-density polyethylene (manufactured by Mitsui Chemicals, Inc.," SP-2320 ", density 0.923), 0.2 parts by weight of a lubricant (talc), B and D : Ethylene-vinyl acetate copolymer having a vinyl acetate content of 15% (“FB-812”, manufactured by Nippon Unicar Co., Ltd.)
100 parts by weight, 10 parts by weight of hydrotalcite (manufactured by Kyowa Chemical Industry Co., Ltd., “Alkamizer DHT-4A”), C: metallocene catalyst-based linear low-density polyethylene (manufactured by Mitsui Chemicals, “SP-1520”, density) 0.915) 10
0 parts by weight, hydrotalcite (Kyowa Chemical Industry Co., Ltd.,
"Alkamizer DHT-4A") 10 parts by weight, E: ethylene-vinyl acetate copolymer having a vinyl acetate content of 12% ("NUC-833", manufactured by Nippon Unicar Co., Ltd.) 10
0 parts by weight, respectively, and a hindered amine light stabilizer (TINUVIN 622LD) is added to the composition of each layer.
0.5 parts by weight and a three-layer composition of B, C and D include a benzophenone-based ultraviolet absorber (manufactured by Cipro Kasei, "SS
-102 ") 0.1 part by weight.

Example 5 In Example 1, the following A (inner layer) and B
(Middle / Inner Layer), C (Intermediate Layer), D (Middle / Outer Layer), E (Outer Layer) In the same manner as in Example 1, except that a composition of 5 layers with an antifogging coating film was used. A resin film was manufactured. The evaluation is shown in Table 1. A: High-pressure low-density polyethylene (manufactured by Tosoh Corporation, “LD1
76R ") 50 parts by weight, 50 parts by weight of a metallocene catalyst-based linear low-density polyethylene (manufactured by Mitsui Chemicals, Inc.," SP-2320 ", density 0.923), 0.2 parts by weight of a lubricant (talc), B and D : Ethylene-vinyl acetate copolymer having a vinyl acetate content of 15% (“FB-812” manufactured by Nippon Unicar Co., Ltd.)
100 parts by weight, 10 parts by weight of hydrotalcite (manufactured by Kyowa Chemical Industry Co., Ltd., “Alkamizer DHT-4A”), C: metallocene catalyst-based linear low-density polyethylene (manufactured by Mitsui Chemicals, “SP-1520”, density) 0.915) 10
0 parts by weight, hydrotalcite (Kyowa Chemical Industry Co., Ltd.,
"Alkamizer DHT-4A") 10 parts by weight, E: 50 parts by weight of an ethylene-vinyl acetate copolymer having a vinyl acetate content of 15% ("FB-812" manufactured by Nippon Unicar Co., Ltd.), a high-pressure low-density polyethylene ( Made by Nippon Unicar,
50 parts by weight of “NUC-8133”), and the hindered amine light stabilizer (T
(INUVIN 622LD) 0.5 part by weight, and 0.1 parts by weight of a benzophenone-based ultraviolet absorber ("SS-102", manufactured by Ciplo Kasei Co., Ltd.) were blended with the three-layer composition of B, C and D.

Example 6 Using a five-layer inflation molding machine, the following A (inner layer), B (middle layer), C (middle layer), D (middle and outer layer) and E (middle and outer layer) Feeding the composition to each extruder,
A five-layer film having a thickness of 100 μm and a width of 8 m was produced (the thickness of each layer was 20 μm). After the outer layer of the film was subjected to corona discharge treatment, an aqueous anti-fog agent comprising silica sol and an acrylic urethane resin binder was applied. After drying, an antifogging coating film was formed to obtain a three-layer agricultural polyolefin resin film with the antifogging coating film. The evaluation is shown in Table 1. A: High-pressure low-density polyethylene (manufactured by Nippon Unicar,
"NUC-8133") 100 parts by weight, lubricant (talc)
0.2 parts by weight, B and C: 100 parts by weight of linear low-density polyethylene (manufactured by Idemitsu Petrochemical Co., Ltd., “0138N”, density 0.916),
15 parts by weight of hydrotalcite ("Alkamizer DHT-4A" manufactured by Kyowa Chemical Industry Co., Ltd.), D and E: ethylene-vinyl acetate copolymer having a vinyl acetate content of 5% ("7B54A" manufactured by Tosoh Corporation) 100 5 parts by weight of hydrotalcite (manufactured by Kyowa Chemical Industry Co., Ltd., “Alkamizer DHT-4A”), and the hindered amine light stabilizer (T
INUVIN 622LD) and 0.5 parts by weight of a benzophenone-based ultraviolet absorber (Cipro Kasei Co., Ltd., "SS-10
2 ") 0.1 part by weight was blended.

Comparative Example 1 In Example 1, the following A (inner layer) and B
(Middle / Inner Layer), C (Intermediate Layer), D (Middle / Outer Layer), E (Outer Layer) In the same manner as in Example 1, except that a composition of 5 layers with an antifogging coating film was used. A resin film was manufactured. The evaluation is shown in Table 1. A: High-pressure low-density polyethylene (manufactured by Tosoh Corporation, “LD1
76R ") 100 parts by weight, 0.2 parts by weight of lubricant (talc), B and D: ethylene-vinyl acetate copolymer having a vinyl acetate content of 15% (" FB-812 "manufactured by Nippon Unicar Co., Ltd.)
100 parts by weight, 10 parts by weight of hydrotalcite (manufactured by Kyowa Chemical Industry Co., Ltd., "Alkamizer DHT-4A"), C: metallocene catalyst-based linear low-density polyethylene (manufactured by Mitsui Chemicals, "SP-2320", density) 0.923) 10
0 parts by weight, hydrotalcite (Kyowa Chemical Industry Co., Ltd.,
"Alkamizer DHT-4A") 10 parts by weight, E: 100 parts by weight of an ethylene-vinyl acetate copolymer having a vinyl acetate content of 5% ("7B54A", manufactured by Tosoh Corporation), and the composition of each layer And 0.5 parts by weight of a hindered amine light stabilizer (TINUVIN 622LD) and a benzophenone ultraviolet absorber ("SS-102", manufactured by Cipro Kasei Co., Ltd.)
0.1 part by weight was blended.

Comparative Example 2 In Example 1, the following A (inner layer) and B
(Middle inner layer), C (intermediate layer), D (middle and outer layer), E (outer layer), except that the composition of Example 1 was used, except that a three-layer agricultural polyolefin system with an antifogging coating film was used. A resin film was manufactured. The evaluation is shown in Table 1. A: High-pressure low-density polyethylene (manufactured by Tosoh Corporation, “LD1
76R ") 10 parts by weight, 90 parts by weight of a metallocene catalyst-based linear low-density polyethylene (manufactured by Mitsui Chemicals, Inc.," SP-2320 ", density 0.923), 0.2 parts by weight of a lubricant (talc), B, C And D: an ethylene-vinyl acetate copolymer having a vinyl acetate content of 15% (manufactured by Nippon Unicar, "FB-81
2)) 100 parts by weight, 10 parts by weight of hydrotalcite ("Alkamizer DHT-4A" manufactured by Kyowa Chemical Industry Co., Ltd.), E: ethylene-vinyl acetate copolymer having a vinyl acetate content of 5% (manufactured by Tosoh Corporation, 100 parts by weight of “7B54A”), 0.5 part by weight of a hindered amine light stabilizer (TINUVIN 622LD) in the composition of each layer, and benzophenone-based ultraviolet light in the composition of three layers B, C and D. Absorbent ("SS-102" manufactured by Cipro Kasei Co., Ltd.)
0.1 part by weight was blended.

Comparative Example 3 In Example 1, the following A (inner layer) and B
(Middle inner layer), C (intermediate layer), D (middle and outer layer), E (outer layer), except that the composition of Example 1 was used, except that a three-layer agricultural polyolefin system with an antifogging coating film was used. A resin film was manufactured. The evaluation is shown in Table 1. A: Linear low-density polyethylene (manufactured by Idemitsu Petrochemical Co., Ltd., “0
138N ", density 0.916) 100 parts by weight, lubricant (talc) 0.2 parts by weight, B, C and D: an ethylene-vinyl acetate copolymer having a vinyl acetate content of 15% (manufactured by Nippon Unicar," FB -81
2)) 100 parts by weight, 10 parts by weight of hydrotalcite ("Alkamizer DHT-4A" manufactured by Kyowa Chemical Industry Co., Ltd.), E: ethylene-vinyl acetate copolymer having a vinyl acetate content of 5% (manufactured by Tosoh Corporation, 100 parts by weight of “7B54A”), 0.5 part by weight of a hindered amine light stabilizer (TINUVIN 622LD) in the composition of each layer, and benzophenone-based ultraviolet light in the composition of three layers B, C and D. Absorbent ("SS-102" manufactured by Cipro Kasei Co., Ltd.)
0.1 part by weight was blended.

Comparative Example 4 In Example 1, the following A (inner layer) and B
(Middle inner layer), C (intermediate layer), D (middle and outer layer), E (outer layer), except that the composition of Example 1 was used, except that a three-layer agricultural polyolefin system with an antifogging coating film was used. A resin film was manufactured. The evaluation is shown in Table 1. A: High-pressure low-density polyethylene (manufactured by Nippon Unicar,
"NUC-8133") 100 parts by weight, lubricant (talc)
0.2 parts by weight, B, C and D: an ethylene-vinyl acetate copolymer having a vinyl acetate content of 15% ("FB-81" manufactured by Nippon Unicar Co., Ltd.)
2)) 100 parts by weight, 10 parts by weight of hydrotalcite ("Alkamizer DHT-4A" manufactured by Kyowa Chemical Industry Co., Ltd.), E: ethylene-vinyl acetate copolymer having a vinyl acetate content of 5% (manufactured by Tosoh Corporation, 40 parts by weight of “7B54A”), and 0.5% by weight of a hindered amine light stabilizer (TINUVIN 622LD) was added to the composition of each layer.
The three-layer composition of B, C and D contains a benzophenone-based ultraviolet absorber ("SS-102", manufactured by Cipro Kasei Co., Ltd.).
1 part by weight was blended.

[0028]

[Table 1]

[0029]

The agricultural polyolefin resin film of the present invention is excellent in film strength, transparency and film reversibility, and is suitable as a covering material for agricultural houses.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08L 23/06 C08L 23/06 23/08 23/08 F term (Reference) 2B024 DB01 EA01 2B029 EB03 EC02 EC14 EC16 EC20 4F006 AA13 AB24 AB37 AB74 AB76 BA10 4F100 AA19A AA20A AC03D AH02C AH02D AH02E AH03B AH03C AH03D AH03E AK03B AK03D AK06B AK06D AK06E AK22B AK22D AK63C AK63D AK63E AK68B AK68C AK68E AL05B AL05D AL05E AR00A BA05 BA07 BA10A CA05B CA05C CA05D CA05E CA07C CA07D CA07E CB00A GB01 JK01 JL00 JL05 JL07A JN01 4J002 BB03W BB03X BB06W GA01 GF00

Claims (3)

[Claims] 1. In a polyolefin resin film for agricultural use having a three-layer or five-layer structure, the inner layer at the time of inflation molding is a line having a high-pressure low-density polyethylene resin of 20 to 100% by weight and a density of 0.900 to 0.930. A low-density polyethylene resin layer composed of 0 to 80% by weight, at least one of the intermediate layers is composed of a linear low-density polyethylene layer having a density of 0.860 to 0.920, and the outer layer is formed of acetic acid. An agricultural polyolefin comprising a layer made of a polyolefin resin having a vinyl content of 0 to 20% by weight, and an outer layer provided with an antifogging coating made of silica sol and / or alumina sol and a resin binder. Resin film. 2. An agricultural polyolefin resin film having a four-layer or five-layer structure, wherein at least another one of the intermediate layers comprises a layer made of a polyolefin resin having a vinyl acetate content of 5 to 20% by weight. The polyolefin resin film for agricultural use according to claim 1, characterized in that: 3. An agricultural polyolefin resin film having a three-layer or five-layer structure, wherein at least one of the intermediate layers has a different structure.
The agricultural polyolefin resin film according to claim 1 or 2, wherein the olefin resin constituting the layer and the outer layer is an ethylene-vinyl acetate copolymer and / or a high-pressure low-density polyethylene.