JP3473986B2 - Agricultural olefin resin film - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a novel agricultural olefin resin film, and more specifically, it has excellent weather resistance and dust resistance without significantly deteriorating transparency, and has a long-term use. The present invention relates to an agricultural olefin resin film suitable for greenhouse cultivation and tunnel cultivation, which exhibits continuous antifogging properties and antifog properties.

[0002]

2. Description of the Related Art Vinyl chloride resin films have hitherto been the mainstream as agricultural films for greenhouse cultivation and tunnel cultivation, but this film has a light-transmitting property due to the adhesion of dust due to breathing of a plasticizer. In addition to the drawback of being damaged, olefinic resin films are being replaced in recent years because of the harmful hydrogen chloride gas generated when incinerating used waste, which causes environmental pollution. .

Since this olefin resin film does not require a plasticizer, there is almost no deterioration in light transmittance during use, no harmful gas is generated during incineration, and it is easy to process vinyl chloride. Although it is superior to the resin film, it lacks weather resistance,
It has the drawback that it cannot be used for a long period of time.

In order to improve the weather resistance of the olefin resin film, a compound containing a specific hindered amine-based light stabilizer and a specific inorganic filler has been known up to now (Japanese Patent Laid-Open No. 56-56). No. 41254), this has a drawback in that although the weather resistance is improved to some extent, the transparency and the mechanical strength are significantly lowered. Further, a combination of a specific hindered amine light stabilizer and a specific antioxidant is blended (JP-A-60-19).
No. 9039), and a mixture of a specific hindered phenolic antioxidant and a specific metal salt of organic phosphoric acid (Japanese Patent Laid-Open No. 62-43442), and the like. It has a drawback that it cannot maintain its weather resistance for a long period of time because it has a high diffusion rate with respect to an olefin resin and is rapidly disappeared from the surface when it comes into contact with water during use.

Further, there has been proposed an agricultural film in which hydrotalcites and a hindered amine compound are blended with an olefin resin to improve weather resistance, transparency, strength and dust resistance (Japanese Patent Publication No. 6-6363). Gazette), it is still inferior in terms of weather resistance, anti-fog property and persistence of anti-fog property and transparency as compared with vinyl chloride resin film,
It was not always satisfactory.

[0006]

DISCLOSURE OF THE INVENTION The present invention overcomes the drawbacks of the conventional olefin resin film for agriculture as described above, has excellent weather resistance and dust-proof property, and does not significantly reduce transparency. Improves fog resistance and fog resistance,
The purpose of the present invention is to provide an agricultural olefin resin film that can be used for a long period of time.

[0007]

Means for Solving the Problems As a result of intensive studies to develop an agricultural olefin resin film having improved properties, the present inventors have found that an acetic acid containing a copolymer of vinyl acetate and olefin is used. Olefin resin with high vinyl content, lithium aluminum complex hydroxide salt, hindered amine light stabilizer, anti-fog agent, and optionally fluorine-based fog inhibitor or silicone anti-fog agent in predetermined amounts On one or both sides of the olefin resin base material layer, polyolefin, or containing a copolymer of vinyl acetate and olefin, by providing a coating layer made of an olefin resin having a low vinyl acetate content to a predetermined thickness, It has been found that the object can be achieved, and the present invention has been completed based on this finding.

That is, the present invention is a copolymer of vinyl acetate and an olefin or a mixture of the copolymer and a polyolefin, wherein the content ratio of vinyl acetate to the whole is 10%.
To 100 parts by weight of olefin resin of 20% by weight,
(A) 1 to 20 parts by weight of lithium aluminum complex hydroxide salt, (B) 0.05 to 3 of hindered amine light stabilizer
Polyolefin, or a copolymer of vinyl acetate and an olefin, on one or both sides of a base material layer having a thickness of 30 to 180 μm, which is composed of a resin composition containing 1 to 4 parts by weight of (C) an antifogging agent. Alternatively, it is a mixture of the copolymer and the polyolefin, and the content ratio of vinyl acetate in the whole is 9
Made of an olefinic resin, which is made of a resin of less than or equal to% by weight,
The present invention provides an olefin resin film for agriculture, which is provided with a coating layer having a thickness of 10 to 50 µm.

The olefin resin used as the resin component of the base material layer is a copolymer of vinyl acetate and olefin, such as a copolymer of vinyl acetate and olefin, in order to enhance the affinity with the antifogging agent and antifog agent incorporated therein. An ethylene / vinyl acetate copolymer or a mixture of the copolymer and a polyolefin, for example, a blend of an ethylene / vinyl acetate copolymer and polyethylene, containing 10 to 10 parts of vinyl acetate based on the entire olefin resin.
It is necessary to contain a relatively large amount of 20% by weight, preferably 10 to 18% by weight.

When the content of vinyl acetate is less than 10% by weight, the affinity with antifog agents and antifog agents is insufficient, and sufficient antifog and antifog sustaining effects cannot be obtained. When it exceeds 20% by weight, the strength of the obtained olefin resin film is lowered.

Examples of the polyolefin include homopolymers of α-olefins such as polyethylene and polypropylene, copolymers of two or more α-olefins such as ethylene / propylene copolymers and ethylene / butene copolymers, and ethylene. And a (meth) acrylic acid or its copolymer may be mentioned, and particularly high-pressure process low-density polyethylene, linear low-density polyethylene, low-density ethylene having a density of 0.910 to 0.935 g / cm ^3.
α-Olefin copolymers are preferred. These olefin resins may be used alone or in combination of two or more.

Next, as the lithium aluminum composite hydroxide salt as the component (A), a compound represented by the general formula [Al ₂ Li (OH) ₆ ] _n X.mH ₂ O (I) (wherein X is an n-valent Anion, m is a number of 3 or less)
Compounds represented by are preferred. As X in this general formula (I), carbonate ion, sulfate ion, phosphate ion, phosphite ion, inorganic anion such as metaphosphate ion, acetate ion, propionate ion, oxalate ion, adipate ion, Examples thereof include organic anions such as benzoate ion and phthalate ion.

This is a known inorganic filler generally available as hexagonal plate-like crystals having a particle size of 5 μm or less, especially 0.1 to 3 μm (JP-A-5-179052).

The component (A) is an olefin resin 10
1 to 20 parts by weight, preferably 3 to 10 parts by weight, relative to 0 parts by weight
It is necessary to blend in an amount in the range of parts by weight. If this amount is less than 1 part by weight, sufficient antifogging and antifog lasting effects cannot be obtained, and if it is more than 20 parts by weight, the tensile strength and tear strength of the film when formed are reduced.

Next, the hindered amine light stabilizer of the component (B) of the present invention can be arbitrarily selected from those conventionally used for olefin resin films for agriculture. As such a thing, for example, 2, 2, 6, 6
-Tetramethylpiperidinyl-4-benzoate, bis- (2,2,6,6-tetramethyl-4-piperidinyl) sebacate, tris (2,2,6,6-tetramethyl-4-piperidine) phosphite 4-benzyloxy-2,2,6,6-tetramethylpiperidine, 4-acetoxy-2,2,6,6-tetramethylpiperidine,
Bis (2,2,6,6-tetramethyl-4-piperidyl) terephthalate, 1,3,8-triaza-7,7,
9,9-Tetramethyl-2,4-dioxo-spiro [4,5] decane, tri- (4-acetoxy-2,2,2
6,6-Tetramethylpiperidine) -amine, 1,2,
3,4-tetra (4-carbonyloxy-2,2,6
6-tetramethylpiperidine) butane, 4- (phenylcarbamoyloxy) -2,2,6,6-tetramethylpiperidine, (2,2,6,6-tetramethylpiperidine) -4-spiro-2 '-( 6 ', 6'-Dimethylpiperidine) -4'-spiro-5 "-hydantoin, 4-
(P-Toluenesulfonyloxy) -2,2,6,6-
Tetramethylpiperidine, 1,3,8-triaza-7,
Examples include 7,9,9-tetramethyl-3-n-octyl-spiro [4,5] decane-2,4-dione, 4-stearoyloxy-2,2,6,6-tetramethylpiperidine it can.

The component (B) is an olefin resin 10
0.05 to 3 parts by weight, preferably 0.1
It is necessary to use an amount in the range of up to 0.4 parts by weight.
When this amount is less than 0.05 parts by weight, sufficient light stability cannot be obtained and the weather resistance is lowered, and when it is more than 3 parts by weight, the transparency is lowered.

The anti-fogging agent as the component (C) of the present invention can also be arbitrarily selected from the anti-fogging agents commonly used for ordinary agricultural olefin resin films, and is particularly polyvalent. Partial esters of alcohols and higher fatty acids are preferred. Examples thereof include sorbitan monostearate, sorbitan monopalmitate, sorbitan monobehenate, sorbitan surfactants such as esters of sorbitan and alkylene glycol condensates and fatty acids, glycerin monopalmitate, and glycerin mono. Glycerin-based surfactants such as stearate, glycerin monolaurate and diglycerin monopalmitate, polyethylene glycol monostearate, polyethylene glycol monopalmitate, polyethylene glycol-based surfactants such as polyethylene glycol alkyl phenyl ether and other trimethylol Trimethylolpropane surfactants such as propane monostearate, pentaerythritol monopalmitate, pentaerythritol monostearate. Such as those comprising a pentaerythritol-based surfactants and their isomers, such bets can be mentioned.

The component (C) is an olefin resin 10
It is necessary to use 1 to 4 parts by weight, preferably 1.5 to 2 parts by weight, per 0 parts by weight. This amount is 1
If it is less than 4 parts by weight, sufficient antifogging effect lasting effect cannot be obtained, and if it exceeds 4 parts by weight, transparency is impaired.

In addition to the components (A) to (C) described above, the resin composition for forming the base material layer of the present invention may further contain, if desired, a fluorine-based fog-preventing agent or a silicone-based fog-preventing agent. A mist can be included. These fog-preventing agents are commonly used in conventional agricultural olefin resin films. Examples of such a fluorine-based fog preventive agent are low molecular weight or high molecular weight compounds containing a perfluoroalkyl group or a perfluoroalkenyl group, and are at least 0.001% by weight, preferably at least 0.01% by weight. Has a solubility in water of 35 dyn / cm or less, preferably 30 dyn / cm at 25 ° C.
Those having the ability to reduce to the following are preferable. Also,
An oxygen atom may intervene in the carbon chain of the perfluoroalkyl group. For example, Unidyne D
S-401, Unidyne DS-403, Unidyne DS
-451 (above, Daikin Industries, Ltd.), Megafac F
-142D, Megafac F-177 (above, manufactured by Dainippon Ink and Chemicals, Inc.), Florard FC-170, Florard FC-176, Florard FC-430 (above, Sumitomo 3M Limited), Surflon S-141, Surflon S. -145, Surflon S-381, Surflon S-
382, Surflon S-393 (all manufactured by Asahi Glass Co., Ltd.) and the like.

Examples of the silicone-based antifoggant include polyether-modified silicone oil, carboxyl-modified silicone oil, carbinol-modified silicone oil, amino-modified silicone oil, etc., generally at least 0.01% by weight, It preferably has a solubility in water of at least 0.1% by weight and has a surface tension of water at 25 ° C. of not more than 35 dyn / cm, preferably 30 d.
Those having the ability to reduce to yn / cm or less are preferable. Such products are commercially available as, for example, KF-354 (manufactured by Shin-Etsu Chemical Co., Ltd.), SH-3746 (manufactured by Toray Dow Corning Co., Ltd.), and TSF-4445 (manufactured by Toshiba Silicone Co., Ltd.).

These antifog agents may be used alone,
You may use it in combination of 2 or more type. The amount of the anti-fog agent added is 0.0 per 100 parts by weight of the olefin resin.
2 to 1.0 parts by weight, preferably 0.04 to 0.3 parts by weight. If the amount is smaller than this, sufficient fog resistance cannot be obtained, and if it is too large, the high frequency adhesiveness and heat sealability deteriorate.

The base material layer of the present invention may contain, for example, silica, talc, aluminum hydroxide, hydrotalcite, calcium sulfate, if desired, in order to further improve heat retention.
Fillers such as calcium silicate, calcium hydroxide, magnesium hydroxide, kaolin clay, mica, alumina, magnesium carbonate, sodium aluminate, conductive zinc oxide, lithium phosphate can be added.
These fillers may be used alone or in combination of two or more. The blending amount is selected in the range of 10 parts by weight or less, preferably 5 parts by weight or less, relative to 100 parts by weight of the polyolefin resin.

In addition to the above, additives such as lubricants, heat stabilizers, ultraviolet absorbers, antioxidants, anti-tacking agents, antistatic agents, and coloring agents, which are commonly used in agricultural films, can be added. . Examples of this lubricant include polyethylene wax, stearic acid, zinc stearate,
Chelators such as barium stearate, calcium stearate, barium ricinoleate, organic phosphites, fatty acid amides such as epoxy resins, stearic acid amides, palmitic acid amides, oleic acid amides, ethylene bis stearoamides, and solid Examples include higher alcohols and glycerin fatty acid esters.

Examples of the ultraviolet absorber include benzotriazole-based, benzophenone-based, and salicylic acid-based ones, and examples of the benzotriazole-based one include 2- (2'-hydroxy-3 ', 5'-diene. -Ter
t-Butylphenyl) -5-chlorobenzotriazole, 2- (2'-hydroxy-3'-tert-butyl-5'-methylphenyl) -5-chlorobenzotriazole, 2- (2'-hydroxy-3 '-Tert-amyl-5'-isobutylphenyl) -5-chlorobenzotriazole, 2- (2'-hydroxy-3'-isobutyl-5'-methylphenyl) -5-chlorobenzotriazole, 2- (2'- Hydroxy-3'-isobutyl-
5'-propylphenyl) -5-chlorobenzotriazole, 2- (2'-hydroxy-3 ', 5'-di-te
rt-Butylphenyl) benzotriazole, 2-
(2'-hydroxy-5'-methylphenyl) benzotriazole, 2- [2'-hydroxy-5 '-(1,
1,3,3-tetramethyl) phenyl] benzotriazole and the like.

Examples of the benzophenone type compounds are 2,2'-dihydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2,2 ', 4,4'- Tetrahydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2,4-dihydroxybenzophenone, 2
-Hydroxy-4-octoxybenzophenone and the like. Examples of salicylic acid-based compounds include phenyl salicylate and paraoctyl phenyl salicylate. As the antioxidant, a hindered phenol compound or a sulfur compound compound is used.

The thickness of the base material layer of the present invention is usually 30-18.
It is selected in the range of 0 μm, preferably 15 to 130 μm. If the thickness is too thin, the anti-fogging property and fog-proof property are insufficiently maintained, and if it is too large, the light transmittance is lowered. The thickness of the base material layer is 50 to 80 with respect to the thickness of the entire film.
% Is preferable, and 55 to 75% is particularly preferable.

In the agricultural film of the present invention, it is necessary to provide a coating layer made of an olefin resin on one surface or both surfaces of the base material layer. The olefin resin used as the resin component of the coating layer is a polyolefin that has been generally used as an agricultural film material until now, or a copolymer of vinyl acetate and olefin or a mixture of the copolymer and polyolefin. Therefore, it is necessary to contain a relatively small amount of vinyl acetate of 9% by weight or less based on the entire olefin resin.

Examples of the polyolefin include homopolymers of α-olefins such as polyethylene and polypropylene, copolymers of two or more α-olefins such as ethylene / propylene copolymers and ethylene / butene copolymers. Possible, but especially with a density of 0.91
High-pressure low-density polyethylene, linear low-density polyethylene, and low-density ethylene / α-olefin copolymer of 0 to 0.935 g / cm ³ are preferable. These olefin resins may be used alone or in combination of two or more. In addition, this coating layer, to prevent blocking,
The inorganic filler can be contained in less than 1% by weight.

This coating layer is provided in order to impart surface smoothness, anti-stickiness and dust resistance to the agricultural film, but the vinyl acetate content of the whole olefin resin exceeds 9% by weight. When a large amount of the inorganic filler is contained, these physical properties and transparency cannot be obtained, and the strength is rather lowered. The thickness of this coating layer is generally 10 to 50 μm, preferably 15 to 30 μm as a whole.
It is selected in the range of. If this thickness is too thin, the dustproof effect will not be sufficient, and if it is too thick, the light transmittance will decrease.

The olefin resin film for agriculture of the present invention is prepared by preparing each pellet capable of forming a base material layer and a coating layer, and then obtaining a predetermined layer thickness by a known method such as coextrusion inflation molding. It can be manufactured by forming a film. Preparation of each pellet in this case, for the pellet for the base layer, using the olefin resin component and various blending components in a predetermined ratio, ribbon blender, Banbury mixer, Henschel mixer, super mixer, single-screw or twin screw By axially pelletizing the composition homogeneously blended using a compounding machine such as a shaft extruder or roll, or a kneading machine, and for the coating layer pellets, an olefin resin component and various additive components are suitable. Using a blender, Banbury mixer, Henschel mixer, supermixer, single-screw or twin-screw extruder, rolls, or other compounding machine or kneader to homogenize the composition, and use it in a conventional manner to pelletize the composition. Done by. The olefin resin film for agriculture of the present invention can be provided with a dustproof layer made of a dustproof coating on its outer surface side or an antifogging layer made of an antifogging coating on its inner surface side.

[0031]

The olefin resin film for agriculture of the present invention is excellent in weather resistance and dustproofness without significantly deteriorating transparency, and further has improved antifogging and fogproof durability.
Has a remarkable effect that it can be used for a long time,
It is suitable for greenhouse greenhouse cultivation and tunnel cultivation.

[0032]

The present invention will be described in more detail by way of examples, which should not be construed as limiting the invention thereto. The parts indicating the amounts used of the respective components are parts by weight, and the performance of the agricultural olefin resin film was determined as follows.

(1) Transparency A haze value was measured with a haze meter manufactured by Suga Test Instruments. For the following performances, the film was tested on the experimental field in Wada Town, Chiba Prefecture from March 1993 with a floor area of 50 cm ×
It was stretched out in a mini-house with a height of 300 cm and a height of 70 cm and a slope, and it was exposed until March 1994 and evaluated as follows.

(2) Weather resistance According to JIS K6781, a tensile elongation test of the film after 12 months of expansion is carried out to obtain the residual rate of elongation (%),
The following criteria evaluated. ◯: Remaining rate of 80% or more. Δ: Residual rate is 50% or more and less than 80%. X: The residual rate is less than 50%.

(3) Dustproofness The haze value of the stain state of the film after a lapse of a predetermined period after spreading was determined by a haze meter and evaluated according to the following criteria. ◯: Haze value is less than 20%. Δ: Haze value of 20% or more and less than 30%. X: Haze value of 30% or more.

(4) Anti-fog property and anti-fog property The following standard was used to evaluate the anti-fog property and anti-fog property of the film after a predetermined period of time passed from the spreading. (A) Antifogging property ⊚: There are no spots where droplets are formed ○: Drops are formed within a range of not more than 10% of the whole △: Drops are formed within a range of 10 to 50% of the whole ×: Whole (B) No fog is observed +: Slight fog is generated ++: Some fog is generated +++: Quite fog It has occurred

Example 1 100 ethylene-vinyl acetate copolymer having a vinyl acetate content of 14% by weight (melt index 1.5 g / 10 minutes)
With respect to parts by weight, the formula (I) (n = 2, m = 1.5, X = C
O ₃ ), having an average particle size of 0.2 μm and a BET specific surface area of 18.2 m ² / g, 5 parts by weight of lithium aluminum complex hydroxide salt, Tinuvin 622
(Ciba Geigy's hindered amine light stabilizer)
0.3 part by weight, 1.0 part by weight of diglycerin monostearate and 0.5 part by weight of glycerin monostearate as an antifogging agent, and benzophenone-based ultraviolet absorber 0.
1 part by weight was added, and the composition was pelletized to obtain a base layer pellet. Separately, high-pressure method low-density polyethylene (density 0.922 g / cc, melt index 2.5
g / 10 minutes) 50 parts by weight and vinyl acetate content 14% by weight
Diglycerin monostearate 1.0 as an antifogging agent for a blended product (vinyl acetate content 7% by weight) with 50 parts by weight of ethylene-vinyl acetate copolymer (melt index 1.5 g / 10 min) Parts by weight and 0.3 parts by weight of glycerin monostearate, tinuvin (Tinuvi)
n) 622 (0.3 parts by weight) and benzophenone-based ultraviolet absorber (0.1 parts by weight) were added, and the composition was pelletized to obtain a coating layer pellet. Inflation processing was performed using these pellets to obtain a 2-type, 3-layer agricultural olefin resin film having a base material layer of 70 μm and each coating layer of 15 μm.

Comparative Example 1 An olefin resin film was obtained in the same manner as in Example 1 except that Tinuvin 622 was not used.

Comparative Example 2 An olefin resin film was obtained in the same manner as in Example 1 except that the lithium aluminum complex hydroxide salt was not used.

Table 1 shows the results of evaluating the physical properties of these film samples.

[0041]

[Table 1]

As a result, all of the comparative examples are inferior in weather resistance, dustproofness and antifogging property, while those of Example 1 of the present invention are good in all of these properties. I understand. Regarding transparency, Example 1 using the lithium-aluminum complex hydroxide salt was slightly lower than that of Comparative Example 2 using the same. Therefore, it was found that the film of the present invention of Example 1 was comprehensively excellent as an agricultural coating material.

Example 2 0.3 part by weight of a hindered amine light stabilizer was added to Tinuvin 770 (manufactured by Ciba-Geigy).
Instead of 2 parts by weight or 0.3 parts by weight of LA-63 (manufactured by Asahi Denka Co., Ltd.), the olefin resin in the coating layer has a vinyl acetate content of 5
An olefin resin film for agriculture was obtained in the same manner as in Example 1 except that 100 parts by weight of an ethylene-vinyl acetate copolymer (melt index 0.5 g / 10 minutes) of 100% by weight was used. As for the physical properties of this film sample, the haze value is 4.5.
%, And was otherwise the same as in Example 1.

Example 3 0.3 part by weight of a hindered amine light stabilizer was added to Tinuvin 765 (manufactured by Ciba-Geigy Co.).
Instead of 2 parts by weight, the amount of the antifogging agent glycerin monostearate used was changed to 1 part by weight, and the olefin resin in the coating layer was changed to a high-pressure low-density polyethylene (density 0.922 g / c
c, melt index 2.5 g / 10 min), and an olefin resin film for agriculture was obtained in the same manner as in Example 1 except that an antifogging agent was not used in the coating layer. The physical properties of this film sample were slightly improved with a haze value of 4.5%,
Others were exactly the same as those in Example 1.

Example 4 100 ethylene-vinyl acetate copolymer having a vinyl acetate content of 14% by weight (melt index 1.5 g / 10 minutes)
With respect to parts by weight, the formula (I) (n = 2, m = 1.2, X = S
O ₄ ), having an average particle size of 0.1 μm and a BET specific surface area of 27.6 m ² / g, 10 parts by weight of a lithium aluminum complex hydroxide salt, Tinuvin 622
(Ciba Geigy's hindered amine stabilizer)
0.3 parts by weight, a mixture of sorbitan-diglycerin condensate monostearate as an antifogging agent and sorbitan sesquistearate EO 5 mol adduct (weight ratio 1/1)
7 parts by weight, 0.1 part by weight of benzophenone-based ultraviolet absorber and DS-401 (manufactured by Daikin Industries, Ltd.) as an antifog agent
0.1 part by weight was added, and the composition was pelletized to obtain a base layer pellet.

Separately, high-pressure low-density polyethylene (density 0.922 g / cc, melt index 2.5 g / 1
0 minutes) 50 parts by weight and ethylene / vinyl acetate copolymer having a vinyl acetate content of 14% by weight (melt index 1.5
g / 10 minutes) 50 parts by weight of a blend (vinyl acetate content 7% by weight), sorbitan-diglycerin condensate monostearate and sorbitan sesquistearate E
1.5 parts by weight of a mixture with an O5 mol adduct (weight ratio 1/1), 0.3 parts by weight of Tinuvin 622, 0.1 part by weight of a benzophenone ultraviolet absorber and DS-401 as an antifog agent (Manufactured by Daikin Industries, Ltd.) 0.1
By weight, the composition was pelletized to obtain pellets for a coating layer. By inflation processing using these pellets, the base material layer 70 μm, each coating layer 15 μm
Thus, an olefin resin film for agricultural use of 3 layers of 2 types was obtained.

Comparative Example 3 An olefin resin film was obtained in the same manner as in Example 4 except that Tinuvin 622 was not used.

Comparative Example 4 An olefin resin film was obtained in the same manner as in Example 4 except that the lithium aluminum composite hydroxide salt was not used.

The hydrotalcite instead Comparative Example 5 Lithium aluminum complex hydroxide salt _{(Mg 0. 7 Al 0.} 3 (OH) 2 (CO 3) 0.15
An olefin resin film was obtained in the same manner as in Example 4 except that 0.55H ₂ O) was used.

Table 2 shows the results of evaluating the physical properties of the film samples of Example 4 and Comparative Examples 3 to 5.

[0051]

[Table 2]

As a result, all of the comparative examples are inferior in weather resistance, dust resistance, antifogging property and fog resistance, whereas those of Example 4 of the present invention are good in all of these properties. In addition, while the transparency of the hydrotalcite compound of Comparative Example 5 was particularly deteriorated, the composition of Example 4 in which the lithium aluminum composite hydroxide salt was used instead of this compounding component was It can be seen that the decrease in transparency is improved. Therefore, it was found that the film of the present invention of Example 4 was comprehensively excellent as an agricultural coating material.

Example 5 LA-63 in place of Tinuvin 622
(Asahi Denka Co., Ltd., hindered amine stabilizer), the same as Example 4 except that DS-403 (manufactured by Daikin Industries, Ltd.) was used instead of DS-401 (manufactured by Daikin Industries, Ltd.) as an antifog agent. To obtain a base material layer pellet.

Separately, an ethylene / vinyl acetate copolymer having a vinyl acetate content of 5% by weight (melt index 0.5 g
/ 10 minutes) to 100 parts by weight, a mixture of sorbitan-diglycerin condensate monostearate and sorbitan sesquistearate EO 5 mol adduct (weight ratio 1/1).
1.5 parts by weight, 0.1 part by weight of a benzophenone-based ultraviolet absorber and 0.1 part by weight of DS-403 (manufactured by Daikin Industries, Ltd.) as an antifog agent were added, and the composition was pelletized to form a coating layer. A pellet for use was obtained. Inflation processing was performed using these pellets to obtain a 2-type, 3-layer agricultural olefin resin film having a base material layer of 70 μm and each coating layer of 15 μm. Regarding the physical properties of this film sample, the haze value was slightly improved to 7.5%, and other properties were exactly the same as those of Example 4.

Example 6 DS-401 (manufactured by Daikin Industries, Ltd.) 0.1 as an antifog agent
KF-354 (manufactured by Shin-Etsu Chemical Co., Ltd.) in place of parts by weight.
A base material layer pellet was obtained in the same manner as in Example 6 except that 3 parts by weight was used.

Separately, 100 parts by weight of linear low-density polyethylene (density 0.907 g / cc, melt index 1.7 g / 10 min) obtained by the metallocene catalyst method was added to sorbitan-diglycerin condensate monostearate and sorbitan. 1.5 parts by weight of a mixture with 5 mol of sesquistearate EO (weight ratio 1/1), 0.1 part by weight of benzophenone-based UV absorber and KF- as an antifog agent
0.3 part by weight of 354 (manufactured by Shin-Etsu Chemical Co., Ltd.) was added, and the composition was pelletized to obtain pellets for a coating layer.
Inflation processing was performed using these pellets to obtain a 2-type, 3-layer agricultural olefin resin film having a base material layer of 70 μm and each coating layer of 15 μm. Regarding the physical properties of this film sample, the haze value was further improved to 7.0%, and the other properties were further improved in the dustproof property and the antifogging property as compared with those in Example 4, and all properties were 1 after spreading.
Even after two months, it was good without any change.

─────────────────────────────────────────────────── --Continued from the front page (56) References JP-A-4-272946 (JP, A) JP-A-4-238029 (JP, A) JP-A-5-179052 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) A01G 13/02 A01G 9/14

Claims (5)

(57) [Claims] 1. A copolymer of vinyl acetate and olefin or a mixture of the copolymer and polyolefin, wherein the content of vinyl acetate is 10 to 20% by weight with respect to 100 parts by weight of the olefin resin. A) A resin composition containing 1 to 20 parts by weight of a lithium aluminum complex hydroxide salt, (B) 0.05 to 3 parts by weight of a hindered amine light stabilizer, and (C) 1 to 4 parts by weight of an antifogging agent. , On one or both sides of the base material layer having a thickness of 30 to 180 μm, a polyolefin, or a copolymer of vinyl acetate and olefin or a mixture of the copolymer and polyolefin, wherein the content ratio of vinyl acetate to the whole is 9% by weight. % Or less resin made of olefin resin, thickness 10-50 μm
An olefin resin film for agriculture, which is provided with a coating layer of. 2. The agricultural olefin resin film according to claim 1, wherein the base material layer is made of a resin composition further containing a fluorine type antifog agent or a silicone type antifog agent. 3. The lithium aluminum complex hydroxide salt has a general formula [Al ₂ Li (OH) ₆ ] _n X.mH ₂ O (where X is an n-valent anion and m is a number of 3 or less). )
The olefin resin film for agriculture according to claim 1 or 2, which is a compound represented by: 4. The agriculture according to claim 1, 2 or 3, wherein the olefin resin of the base material layer is an ethylene / vinyl acetate copolymer or a mixture thereof with a low density polyethylene or an ethylene / α-olefin copolymer. Olefin resin film for use. 5. The olefin resin of the coating layer is at least one selected from low density polyethylene, ethylene / α-olefin copolymers and ethylene / vinyl acetate copolymers. The olefin resin film for agriculture according to any one of claims.