JP2001316530A - Polyolefin-based resin composition and resin film using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a resin film having excellent humectant properties and excellent transparency with a good balance and a polyolefin-based resin composition providing the film. SOLUTION: This resin film is characterized by having at least one layer composed of the polyolefin-based resin composition comprising an inorganic powder represented by the formula (I) in an amount of 1-250 pts.wt. based on the 100 pts.wt. of a polyolefin-based resin: M2+1-xAl3+x(OH-)2.[(An-)(x-a)/n.(Bm-)a/].bH2O (I), wherein M2+ is one or more kinds of divalent metal ions selected from Mg, Ca and Zn; An- is one or more kinds of n-valent silicate ions containing two or more Si; Bm- is one or more kinds of m-valent anions without containing Si; and x, a and b satisfy the following conditional formulae: 0<x<0.5; 0<a<x; and 0<=b<=2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin film having a good balance between excellent heat retention and excellent transparency, a polyolefin resin composition providing the same, and uses of the resin film.

[0002]

2. Description of the Related Art In recent years, the demand for resins used outdoors, such as automotive materials, building materials, agricultural materials, etc., has increased dramatically. For example, agricultural materials include agricultural films used for covering facilities such as houses and tunnels in greenhouse horticulture. Conventional agricultural films include polyvinyl chloride films and polyolefin resin films (eg, polyethylene film, ethylene /
Vinyl acetate copolymer film) and the like are widely used. Among them, recently, polyolefin-based resin films, which are hardly soiled, lightweight, and hardly generate toxic gas during incineration, have been widely used for greenhouse horticulture. In order to express good crop growth, the performance required for these agricultural films includes transparency for good penetration of sunlight and high temperatures inside facilities such as houses to prevent temperature drop at night, especially at night. Keeping heat retention and the like can be mentioned.

For example, JP-A-56-84956, JP-A-55-151043, and JP-A-63-2863
Addition of inorganic compounds such as silicon oxide, aluminum silicate, hydrotalcites, alumina and zeolite and organic compounds such as acetal resin as described in JP-A-43-43 and JP-A-56-41254. There is known a resin film having improved heat retention.

[0004] However, in the prior art, a large amount of these compounds must be added in order to obtain a desired heat retaining property, which causes a problem that the transparency of the film is impaired.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a resin film having a good balance between excellent heat retention and excellent transparency, and a polyolefin resin composition for providing the same.

[0006]

Means for Solving the Problems The present inventors have conducted intensive studies to achieve the above object, and as a result, have found that a layer made of a polyolefin resin composition obtained by mixing a specific amount of a specific inorganic powder with a polyolefin resin. The present inventors have found that the resin film provided has the above-mentioned object, and have completed the present invention.

[0007] One embodiment of the present invention is a polyolefin resin composition comprising 1 to 250 parts by weight of an inorganic powder represented by the following formula (I) based on 100 parts by weight of a polyolefin resin. It is. ^{_{M 2+ 1-x Al 3+ x}} (OH -) 2 · [(A n-) (xa) / n · (B m-) a / m] · bH 2 O (I) where, M ²⁺ is mg, one or more divalent metal ion selected from Ca and Zn, a ^n-1 or more n-valent silicate ions containing two or more Si, B ^m-is one or more that do not contain Si It is a m-valent anion, and x, a, and b satisfy the following conditional expressions. 0 <x <0.5, 0 <a <x, 0 ≦ b ≦ 2 The resin composition further contains at least one of a hindered amine compound, an ultraviolet absorber, an anti-fog agent, and an anti-fog agent. Can be. Another embodiment of the present invention is a resin film having at least one layer made of the above resin composition. The film may further contain at least one selected from a hindered amine compound, an ultraviolet absorber, an anti-fogging agent and an anti-fog agent. Further, the resin film of the present invention can have an antifogging coating layer. Still another embodiment of the present invention is a method for cultivating a crop, wherein the method is performed in a horticultural facility using the resin film.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION A resin film according to the present invention comprises a polyolefin resin composition containing 1 to 250 parts by weight of an inorganic powder represented by the following formula (I) per 100 parts by weight of a polyolefin resin. At least one layer
It is characterized by having a layer. ^{_{M 2+ 1-x Al 3+ x}} (OH -) 2 · [(A n-) (xa) / n · (B m-) a / m] · bH 2 O (I) where, M ²⁺ is mg, one or more divalent metal ion selected from Ca and Zn, a ^n-1 or more n-valent silicate ions containing two or more Si, B ^m-is one or more that do not contain Si It is a m-valent anion, and x, a, and b satisfy the following conditional expressions. 0 <x <0.5, 0 <a <x, 0 ≦ b ≦ 2

[0009] A ^n- is an inorganic powder of the formula (I) in the resin film is one or more silicate ions containing two or more Si, represented by ^n- (Si _{o O p).} Here, o is an integer of 2 or more, and p is an integer of (2o + 1) or more. B
^m- is not particularly limited as long as it is a m-valent anion that does not contain Si. However, carbonate ion, sulfate ion, nitrate ion, halogen ion, oxyacid ion of chlorine, oxyacid ion of boron and oxyacid of phosphorus Anions selected from the group consisting of the following ions are preferred. Further, B ^m- is more preferably a carbonate ion and a sulfate ion, or a carbonate ion and a boron oxyacid ion, or a carbonate ion and a phosphorus oxyacid ion. Preferred examples of the inorganic powder include Magcrysta (trade name) manufactured by Kyowa Chemical Industry. The average particle diameter of the inorganic powder is usually 5 μm or less, preferably 0.03 to 2 μm.

The apparent density of the inorganic powder of the formula (I) is determined according to JIS
0.13 g / value measured by the method described in K6721.
cm ³ or more is preferable, and 0.18 g / cm ³ or more is more preferable. When the apparent density of the inorganic powder is 0.13 g / cm ³ or more, the film becomes particularly excellent in transparency.

The refractive index of the inorganic powder of the formula (I) is determined according to JIS
The values measured by the method described in K0062 are 1.48 to 1.
52, preferably 1.49 to 1.51.
Is more preferably within the range.

The inorganic powder may be subjected to a surface treatment with a dispersant in order to further improve the dispersibility in the polyolefin resin composition. As dispersants, stearic acid, palmitic acid, higher fatty acids such as lauric acid, calcium salts of higher fatty acids, zinc salts, magnesium salts, barium salts, metal soaps such as sodium salts, phosphate esters, silane coupling agents, Examples thereof include an aluminum-based coupling agent, a zirconium-based coupling agent, and a wax. The surface treatment method may be any method as long as the dispersant adheres uniformly to the surface of the inorganic powder.

The content of the inorganic powder of the formula (I) in the polyolefin resin composition is as follows.
It is 1 to 250 parts by weight with respect to 00 parts by weight. By having a layer comprising the polyolefin-based resin composition containing the inorganic powder of the formula (I) in such an amount, the resin film of the present invention has a good balance between excellent heat retention and excellent transparency. .

From the viewpoint of the transparency and strength of the film,
The content of the inorganic powder of the formula (I) in the resin film of the present invention is preferably in the range of 1 to 30% by weight, more preferably 2 to 20% by weight, and more preferably 3 to 3% by weight.
A range of 15% by weight is more preferred. If it is less than 1% by weight, the heat retention of the film tends to be insufficient, and if it exceeds 30% by weight, the transparency and strength of the film tend to decrease.

Examples of the polyolefin resin in the polyolefin resin composition include homopolymers of α-olefin such as polyethylene and polypropylene;
Ethylene / propylene copolymer, ethylene / butene-1
Ethylene / α-olefin copolymer such as copolymer, ethylene / 4-methyl-1-pentene copolymer, ethylene / hexene-1 copolymer, ethylene / octene-1 copolymer; ethylene / vinyl acetate copolymer Polymers, ethylene / acrylic acid copolymers, ethylene / methyl methacrylate copolymers, ethylene / vinyl acetate / methyl methacrylate copolymers, ionomer resins and other hetero-monomers as main components And copolymers. When the resin film of the present invention is an agricultural film, transparency,
From the viewpoints of weather resistance, economy and the like, polyethylene, ethylene / α-olefin copolymer, and ethylene / vinyl acetate copolymer having a vinyl acetate unit content of 30% by weight or less are preferred.

[0016] Ethylene and an α-olefin having 3 to 18 carbon atoms are converted to a so-called single-site catalyst such as a transition metal complex catalyst such as palladium or nickel or a metallocene catalyst, in the presence or absence of a solvent. Gas phase-solid phase,
The ethylene / α-olefin copolymer obtained by polymerization under a liquid phase-solid phase or a uniform liquid phase is preferable as the polyolefin-based resin. Usually, the polymerization temperature in the production of such an ethylene / α-olefin copolymer is from about 30 ° C to about 3 ° C.
And the polymerization pressure is from atmospheric pressure to about 3000 kg / c.
m ² . For example, a so-called metallocene-based olefin polymerization containing a metallocene catalyst component described in JP-A-6-9724, JP-A-6-136195, JP-A-6-136196, JP-A-6-207057, etc. An ethylene / α-olefin copolymer obtained by copolymerizing ethylene with an α-olefin having 3 to 18 carbon atoms in the presence of a catalyst for use can be preferably used in the present invention.

The resin film of the present invention may contain at least one selected from a hindered amine compound, an ultraviolet absorber, an anti-fogging agent and an anti-fog agent.

The hindered amine compound used in the resin film of the present invention may have, for example, the structural formula described in JP-A-7-286052. Specific examples include tinuvin 622-LD, chimassorb 944-LD,
Hostabin N30, VP Sanduvor PR-3
1, Tinuvin 123 (trade name). In addition, Japanese Unexamined Patent Publication
It is also possible to use Tinuvin 492, Tinuvin 494 (trade name) manufactured by Ciba Specialty Chemicals, which is a hindered amine compound-containing stabilizer described in 3-286448. Also, "Plastic Swage"
The NOR-type hindered amine compounds described in April 2000, pages 110 to 116 can also be used. The hindered amine compounds may be used alone or in combination of two or more. From the viewpoint of the weather resistance imparting effect and blooming, the content of the hindered amine compound in the resin film of the present invention is 0.0% of the entire film.
It is preferably from 1 to 5% by weight, more preferably from 0.1 to 2% by weight.

The ultraviolet absorber used in the resin film of the present invention includes a benzophenone ultraviolet absorber, a benzotriazole ultraviolet absorber, a benzoate ultraviolet absorber, a cyanoacrylate ultraviolet absorber and the like. The ultraviolet absorber may be used alone or in combination of two or more. In light of the effect of imparting weather resistance and suppressing blooming, the content of the ultraviolet absorber in the resin film of the present invention is preferably 0.01% to 3% by weight, and more preferably 0.03% to 2% by weight of the entire film.

As the antifog agent used in the resin film of the present invention, for example, a fluorine compound having a perfluoroalkyl group, an ω-hydrofluoroalkyl group or the like (particularly a fluorine-based surfactant), or an alkylsiloxane group Silicon-based compounds (especially silicon-based surfactants). Specific examples of the fluorine-based surfactant include Unidyne DS-403 and DS-4 manufactured by Daikin Industries, Ltd.
06, DS-401 (trade name), Surflon KC-40 (trade name) manufactured by Seimi Chemical Co., Ltd., and as the silicon-based surfactant, SH- manufactured by Toray Dow Corning Silicon Co., Ltd. is used. 3746 (trade name). The content of the antifog agent in the resin film of the present invention is preferably 0.01 to 3% by weight of the whole film,
2 wt% is more preferable, and 0.05 to 1.5 wt% is particularly preferable.

The antifogging agent used in the resin film of the present invention is not particularly limited as long as it is a surfactant, but a nonionic surfactant is preferably used from the viewpoint of compatibility with the resin and thermal stability. Specifically, sorbitan monopalmitate, sorbitan monostearate, sorbitan monopalmitate, sorbitan monomontanate, sorbitan monooleate, sorbitan fatty acid esters such as sorbitan dioleate and sorbitan-based interfaces such as alkylene oxide adducts thereof Activator, glycerin monopalmitate, glycerin monostearate, diglycerin distearate, triglycerin monostearate,
Tetraglycerin dimontanate, glycerin monooleate, diglycerin monooleate, diglycerin sesquioleate, tetraglycerin monooleate, hexaglycerin monooleate, hexaglycerin trioleate, tetraglycerin trioleate, tetraglycerin monolaurate Glycerin surfactants such as glycerin fatty acid esters such as hexaglycerin monolaurate and alkylene oxide adducts thereof; polyethylene glycol surfactants such as polyethylene glycol monopalmitate and polyethylene glycol monostearate; alkylene oxide addition of alkylphenol , Sorbitan / glycerin condensate and ester of organic acid, polyoxyethylene (2 mol) stearylamine, polyoxy Styrene (4 mol) stearylamine, polyoxyethylene (2 mol) stearylamine monostearate, polyoxyethylene (4 mol) Polyoxyethylene alkyl amines such as laurylamine monostearate and fatty acid esters. The content of the antifogging agent in the resin film of the present invention is preferably 0.1 to 4% by weight, more preferably 0.5 to 3% by weight, and particularly preferably 1 to 2.5% by weight of the whole film.

The resin film of the present invention may be a wax, an antioxidant, an antistatic agent, a light stabilizer other than a hindered amine type, a lubricant, a pigment, an antialgal agent, as long as the effects of the present invention are not significantly impaired. Various additives such as an inorganic powder other than the inorganic powder of the formula (I) can be contained. These additives may be used alone or in combination of two or more.

Examples of the inorganic powder other than the inorganic powder of the formula (I) include lithium-aluminum composite hydroxides and similar compounds (for example, JP-A-5-179052, WO97 / 00828, JP-A-8-31128).
No. 4), oxides of metals such as magnesium oxide, calcium oxide, aluminum oxide, silicon oxide, titanium oxide, lithium hydroxide, magnesium hydroxide, calcium hydroxide, aluminum hydroxide, etc. Hydroxide, magnesium carbonate, calcium carbonate,
Carbonates such as basic aluminum carbonate described in JP-A-9-279131, sulfates such as potassium sulfate, magnesium sulfate, calcium sulfate, zinc sulfate and aluminum sulfate, lithium phosphate, sodium phosphate, potassium phosphate, calcium phosphate; Zirconium phosphate (for example,
Phosphates such as H-type zirconium phosphate disclosed in JP-A-8-67774, silicates such as magnesium silicate, calcium silicate, aluminum silicate and titanium silicate, sodium aluminate, potassium aluminate, calcium aluminate and the like. Aluminosilicates, aluminosilicates such as sodium aluminosilicate, potassium aluminosilicate, calcium aluminosilicate, clay minerals such as kaolin, clay and talc, and other composite oxides are exemplified.

The resin film of the present invention may have an antifogging film on at least one surface. A resin film having an anti-fogging film can maintain its anti-fogging property for a long period of time. Examples of the anti-fog coating include, for example, coating films of inorganic oxide sols represented by colloidal silica and alumina sol described in JP-B-49-32668 and JP-B-50-11348.
JP-A-55-56177, JP-A-57-9857
No. 8, JP-A-57-119974, JP-A-5-119974
A coating film of an inorganic oxide sol and an organic compound (such as a surfactant or a resin) described in JP-A-207643, a coating film of a liquid containing a surfactant as a main component,
Hydrophilic resin (for example, polyvinyl alcohol, polysaccharide,
And polyacrylic acid. ) As a main component. The method of forming these antifogging films may be coating, or after forming the antifogging film, the film may be laminated on a laminated film. The antifogging film may be a single layer or two or more layers.

The resin film of the present invention may be composed of a single layer of the above-mentioned polyolefin-based resin composition comprising a polyolefin-based resin and an inorganic powder represented by the formula (I). It may be a multilayer film composed of two or more layers made of an object. Further, as long as the effects of the present invention are not significantly impaired, a multilayer film composed of one or more layers made of the polyolefin-based resin composition and one or more layers made of a resin material other than the resin composition may be used. . The layer constitution of the multilayer film is not particularly limited, and for example, two kinds, two layers, two kinds, three layers, three kinds, three layers, five kinds, five layers and the like are possible.

The resin film of the present invention can be produced from the polyolefin resin composition by a conventional film forming method such as a calendering method, an extrusion T-die molding method and an inflation molding method. Further, when the resin film of the present invention is a multilayer film, co-extrusion molding method, melt coating method, extrusion lamination method,
It can be manufactured by a multilayer film forming method such as a dry lamination method.

The resin film of the present invention has a thickness
It includes both what is commonly referred to as a film and what is generally referred to as a sheet.
mm, and the film thickness can be appropriately selected according to the use of the film. From the viewpoint of film strength, the thickness is preferably 0.01 mm or more. Further, from the viewpoint of the splicing workability of the film and the workability of coating when used as an agricultural film, 0.3
mm or less, more preferably 0.03 to 0.25 mm.

Since the resin film of the present invention has a good balance between excellent transparency and excellent heat retaining property, it is preferably used as a material for facility horticulture, particularly as a covering film for an agricultural facility such as an agricultural house or a tunnel. Can be. A horticultural facility (agricultural house or tunnel) using the resin film of the present invention as a covering film can efficiently take in sunlight during the day and keep the inside of the facility well warm at night. Therefore, crops that are preferred to be cultivated under such conditions can be suitably cultivated in a horticulture facility using the resin film of the present invention.

The resin film of the present invention has an excellent balance between heat insulation and transparency, and the excellent performance of the film is based on the polyolefin resin composition containing an inorganic powder of the formula (I). Is based on the fact that the layer consisting of has an excellent balance between heat retention and transparency. This polyolefin-based resin composition, that is, a polyolefin-based resin composition characterized by containing 1 to 250 parts by weight of an inorganic powder represented by the following formula (I) based on 100 parts by weight of a polyolefin-based resin, is novel. And is an embodiment of the present invention. ^{_{M 2+ 1-x Al 3+ x}} (OH -) 2 · [(A n-) (xa) / n · (B m-) a / m] · bH 2 O (I) where, M ²⁺ is mg, one or more divalent metal ion selected from Ca and Zn, a ^n-1 or more n-valent silicate ions containing two or more Si, B ^m-is one or more that do not contain Si It is a m-valent anion, and x, a, and b satisfy the following conditional expressions. 0 <x <0.5, 0 <a <x, 0 ≦ b ≦ 2

The polyolefin resin composition of the present invention comprises:
It can contain at least one selected from a hindered amine compound, an ultraviolet absorber, an anti-fogging agent and an anti-fog agent, and a composition containing such components can be suitably used for the resin film. The polyolefin-based resin composition of the present invention is a wax, an antioxidant, an antistatic agent, a light stabilizer other than a hindered amine type, a lubricant, a pigment,
Various additives such as an anti-algal agent and an inorganic powder other than the inorganic powder of the formula (I) can also be contained. These additives may be used alone or in combination of two or more.

As described above, the above-mentioned polyolefin resin composition is useful as a material for the resin film of the present invention. By utilizing the above-mentioned properties of the composition, it is processed into molded articles of various shapes other than the film. Can also be used for agricultural materials,
It can be applied to fields such as home appliances, automobile materials, and building materials.

The polyolefin resin composition of the present invention comprises:
For example, it can be manufactured by the following method. A predetermined amount of inorganic powder and, if necessary, an additive are mixed with the polyolefin resin using a mixer. As a mixing machine, for example, a ribbon blender, a super mixer,
Conventional devices such as a Banbury mixer, a single screw extruder, and a twin screw extruder can be used. The obtained resin composition can be processed into molded articles of various shapes by extrusion molding, injection molding, blow molding or the like.

[0033]

The resin film of the present invention has excellent heat retention and excellent transparency based on the excellent balance between the heat retention and transparency of the layer comprising the specific polyolefin resin composition contained therein. Have a good balance. Therefore, the film can be suitably used as a covering film or a mulching film for facilities such as an agricultural house or a tunnel. In other words, the polyolefin-based resin composition of the present invention is industrially useful because it can provide a resin film having excellent balance between excellent heat retention and excellent transparency.

[0034]

EXAMPLES Examples of the present invention will be described below, but the present invention is not limited to these examples. In addition, the test method in an Example and a comparative example is as follows, and all are evaluations with a multilayer film.

[Evaluation of Heat Insulation] Using an infrared spectrophotometer (1640 type FTIR manufactured by Perkin Elmer), a radiation transmission index was determined by the following method and used as a measure of heat insulation. An infrared absorption spectrum of the film was measured at a temperature of 23 ° C. in a wave number range of 4400 to 350 cm ⁻¹ , and a value of transmittance T (ν)% at a wave number ν was obtained. On the other hand, according to the following equation (1) obtained from Planck's law, the blackbody radiation spectrum intensity e (ν) at 23 ° C. at a wavenumber ν was calculated. Here, the value obtained by multiplying the blackbody radiation spectrum intensity e (ν) by the transmittance T (ν) becomes the radiation transmission intensity f (ν) [see equation (2)]. e (ν) = (A / λ ⁵ ) / {exp [B / (λ × T)] − 1} (1) where A = 2πhc ² = 3.742 × 10 ⁻¹² (W / cm ² ) B = Hc / k = 1.438 (cm · K) where T is the absolute temperature (K), λ is the wavelength (cm) (= 1
/ Ν), h is Planck's constant, c is light speed, and k is Boltzmann's constant. f (ν) = e (ν) × T (ν) / 100 (2) Change the radiation transmission intensity f (ν) to a wave number of 4400 to 350 cm ^−1.
Is the radiation transmission energy F, and the black body radiation spectrum e (ν) is the wave number of 4400 to 350 cm ^−1.
Is defined as a radiation transmission energy E, which is a radiation transmission index G = F / E × 100. The actual integration was performed by trapezoidal approximation by dividing at every wave number interval of 2 cm ^-1 . The smaller the radiation transmission index, the better the heat retention of the film.

[Measurement of Transparency] According to JIS K7105, using a direct-read type haze computer HGM-2DP (manufactured by Suga Test Instruments), the total light transmittance and H of the film were measured.
AZE was measured. The smaller the value of HAZE, the better the transparency of the film.

[Apparent Density Measurement] The apparent density of the inorganic powder is as follows:
It was measured in accordance with JIS K6721.

Example 1 10 parts by weight of an inorganic powder M having an apparent density of 0.18 g / cm ³ was added to 83.9 parts by weight of an ethylene / vinyl acetate copolymer (trade name: Evatate H2031; manufactured by Sumitomo Chemical Co., Ltd.). Part, hindered amine compound A
(Product name: Tinuvin 622; Ciba Specialty
Chemicals) 0.3 parts by weight, hindered amine compound B (trade name: Chimasorb 944; Ciba Specialty Chemicals) 0.3 parts by weight, ultraviolet absorber (trade name: Sumisorb 130; Sumitomo Chemical Co., Ltd.) 1 part by weight, an antioxidant (trade name: Irganox 1010;
0.1 part by weight, Ciba Specialty Chemicals), 1.0 part by weight of sorbitan monostearate, 0.6 part by weight of diglycerin distearate and 1.0 part by weight of diglycerin monooleate as an antifogging agent, fog proof 0.1 parts by weight of a fluorine-based surfactant (trade name: DS-403; manufactured by Daikin Industries, Ltd.) was added as an agent, and the mixture was kneaded at 150 ° C. for 5 minutes using a Banbury mixer. A pellet of the composition was obtained. This resin composition is referred to as a resin composition (1). Next, the hindered amine compound A was added to 96.9 parts by weight of an ethylene / vinyl acetate copolymer (trade name: Evatate D2011; manufactured by Sumitomo Chemical Co., Ltd.).
0.6 parts by weight, 0.1 part by weight of ultraviolet absorber, 0.1 part by weight of antioxidant, 1.4 parts by weight of sorbitan monostearate, 0.6 part by weight of diglycerin distearate, 0.1 part by weight of stearamide. 2 parts by weight, fluorine surfactant 0.1
Parts by weight, using a Banbury mixer at 150 ° C,
After kneading for 5 minutes, the mixture was granulated by a granulator to obtain pellets of the resin composition. This resin composition is referred to as a resin composition (2). An inflation film molding machine using the above two types of pellets, an intermediate layer composed of the resin composition (1),
Further, a 0.1 mm-thick laminated film (intermediate layer 0.06 mm, inner and outer layers 0.02 mm each) composed of an inner layer and an outer layer composed of the resin composition (2) laminated on both sides thereof was prepared. As shown in Table 1, this film had a good balance between excellent heat retention and excellent transparency.

Comparative Example 1 Inorganic powder M used in Example 1
Instead of using a hydrotalcite compound (indicated by inorganic powder H in Table 1), a film was produced in exactly the same manner as in the example. As shown in Table 1, this film was inferior to the film of Example 1 in heat retention and transparency.

Comparative Example 2 Inorganic Powder M Used in Example 1
Instead, a film was produced in exactly the same manner as in the example except that silicon oxide was used. As shown in Table 1, this film was inferior to the film of Example 1 in heat retention and transparency.

Example 2 128.1 parts by weight of an inorganic powder M having an apparent density of 0.18 g / cm ³ was added to 87.1 parts by weight of an ethylene / vinyl acetate copolymer (trade name: Evatate H2031; manufactured by Sumitomo Chemical Co., Ltd.). Part, hindered amine compound A
0.30 parts by weight, hindered compound B 0.3 parts by weight,
0.1 parts by weight of an antioxidant and 0.2 parts by weight of stearamide as a lubricant were added, and 1 part was added using a Banbury mixer.
After kneading at 50 ° C. for 5 minutes, the mixture was granulated by a granulator to obtain pellets of the resin composition. This resin composition is
(3). Next, an ethylene / hexene-1 copolymer (trade name: Sumikacene EFV201; manufactured by Sumitomo Chemical Co., Ltd.) 6
0 parts by weight, low density polyethylene (trade name: Sumikasen
F208-1; manufactured by Sumitomo Chemical Co., Ltd.) 39 parts by weight, hindered amine compound A 0.6 parts by weight, ultraviolet absorber 0.
1 part by weight, 0.1 part by weight of an antioxidant, and 0.2 part by weight of stearamide were added, and 1 part by weight was added using a Banbury mixer.
After kneading at 50 ° C. for 5 minutes, the mixture was granulated by a granulator to obtain pellets of the resin composition. This resin composition is
(4). Inflation film molding machine using the above two types of pellets, an intermediate layer composed of the resin composition (3), and a thickness of 0.075 mm composed of an inner layer and an outer layer composed of the resin composition (4) laminated on both sides thereof. Laminated film (intermediate layer 0.045 mm, inner and outer layers 0.01
5 mm). Thereafter, the inner layer surface is subjected to corona treatment, and alumina sol (trade name: alumina sol 5)
20; manufactured by Nissan Chemical; solid content: 20%), colloidal silica (trade name: Snowtex 20; manufactured by Nissan Chemical;
Solid content: 20%), sodium dodecylbenzenesulfonate (trade name: Neoperex F25; manufactured by Kao),
A coating solution prepared by diluting sodium decanoate (manufactured by Nacalai Tesque) with water so as to have a solid concentration of 1.6 / 0.4 / 0.08 / 0.08, respectively, was coated with a solid having a solid content of about 0.1%. The coating was applied at 1 g / m ² and dried at room temperature to obtain a laminated film having an antifogging film. As shown in Table 2, this film had a good balance between excellent heat retention and excellent transparency.

Comparative Example 3 Inorganic Powder M Used in Example 2
Instead of using a hydrotalcite compound (indicated by inorganic powder H in Table 2), a film was produced in exactly the same manner as in the example. As shown in Table 2, this film was inferior to the film of Example 2 in heat retention and transparency.

Comparative Example 4 Inorganic Powder M Used in Example 2
Instead of lithium aluminum composite hydroxide (Table 2
In this example, a film was produced in exactly the same manner as in Example except that inorganic powder L was used. As shown in Table 2, this film was inferior to the film of Example 2 in heat retention and transparency.

[0044]

[Table 1] Inorganic powder M: Mg ²⁺ _0.67 Al ³⁺ _0.33 (OH ⁻ ) _2. (Si ₄ O ₉ ^2- ) _0.065 (SO ₄ ^2- ) _0.07 0.
_{^{07 (CO 3 2-) 0.03 ·}} 0.58H 2 O inorganic powder H: hydrotalcite _{^{Mg 2+ 0.69 Al 3+ 0.31 (OH}} -) 2 · (CO 3 2-) 0.155 · 0.54H 2 O

[0045]

[Table 2] Inorganic powder M: Mg ²⁺ _0.67 Al ³⁺ _0.33 (OH ⁻ ) _2. (Si ₄ O ₉ ^2- ) _0.065 (SO ₄ ^2- ) _0.07 0.
_{^{07 (CO 3 2-) 0.03 ·}} 0.58H 2 O inorganic powder H: hydrotalcite _{^{Mg 2+ 0.69 Al 3+ 0.31 (OH}} -) 2 · (CO 3 2-) 0.155 · 0.54H 2 O inorganic powder L: lithium aluminum complex hydroxide _{^{Li + 2 Al 3+ 4 (OH}} -) 12 · (CO 3 2-) · 3H 2 O

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08K 3/38 C08K 3/38 5/17 5/17 F term (Reference) 2B024 DB01 EA01 2B029 EC02 EC09 EC14 EC16 EC17 EC19 EC20 4F071 AA15X AA28X AA76X AC10 AC12 AE05 AE10 AE22 AF03 AF30 AF56 BA01 BB06 BB09 BC01 4J002 BB031 BB051 BB061 BB071 BB081 BB121 BB151 BB231 DJ006 DK006 EH037 FD57 EU007 FE070 007

Claims (15)

[Claims] 1. A polyolefin-based resin composition comprising 1 to 250 parts by weight of an inorganic powder represented by the following formula (I) based on 100 parts by weight of a polyolefin-based resin. ^{_{M 2+ 1-x Al 3+ x}} (OH -) 2 · [(A n-) (xa) / n · (B m-) a / m] · bH 2 O (I) where, M ²⁺ is mg, one or more divalent metal ion selected from Ca and Zn, a ^n-1 or more n-valent silicate ions containing two or more Si, B ^m-is one or more that do not contain Si It is a m-valent anion, and x, a, and b satisfy the following conditional expressions. 0 <x <0.5, 0 <a <x, 0 ≦ b ≦ 2 Wherein the inorganic powder B ^m-is, carbonate ion, selected from the group consisting of ions of sulfate ion, nitrate ion, halogen ions, ions of oxyacids of chlorine ion and oxy acids of phosphorus oxyacid of boron The polyolefin resin composition according to claim 1, wherein the composition is an anion. 3. The inorganic powder according to claim 2, wherein B ^m- is a carbonate ion and a sulfate ion, a carbonate ion and a boron oxyacid ion, or a carbonate ion and a phosphorus oxyacid ion. Item 7. The polyolefin resin composition according to Item 1. 4. An inorganic powder having an apparent density of 0.13 g / cm ^3.
The polyolefin-based resin composition according to any one of claims 1 to 3, characterized in that: 5. The polyolefin resin composition according to claim 1, wherein the refractive index of the inorganic powder is in the range of 1.48 to 1.52. 6. A hindered amine compound, an ultraviolet absorber,
The polyolefin resin composition according to any one of claims 1 to 5, comprising at least one selected from an antifogging agent and an antifog agent. 7. A layer comprising a polyolefin resin composition containing 1 to 250 parts by weight of an inorganic powder represented by the following formula (I) per 100 parts by weight of a polyolefin resin. Resin film. ^{_{M 2+ 1-x Al 3+ x}} (OH -) 2 · [(A n-) (xa) / n · (B m-) a / m] · bH 2 O (I) where, M ²⁺ is mg, one or more divalent metal ion selected from Ca and Zn, a ^n-1 or more n-valent silicate ions containing two or more Si, B ^m-is one or more that do not contain Si It is a m-valent anion, and x, a, and b satisfy the following conditional expressions. 0 <x <0.5, 0 <a <x, 0 ≦ b ≦ 2 8. The inorganic powder wherein B ^m− is selected from the group consisting of carbonate ion, sulfate ion, nitrate ion, halogen ion, chlorine oxyacid ion, boron oxyacid ion and phosphorus oxyacid ion. The resin film according to claim 7, wherein the resin film is an anion. 9. ^{Bm- in the} inorganic powder is a carbonate ion and a sulfate ion, a carbonate ion and a boron oxyacid ion, or a carbonate ion and a phosphorus oxyacid ion. Item 7. The resin film according to Item 7. 10. The inorganic powder has an apparent density of 0.13 g / cm.
The resin film according to any one of claims 7 to 9, wherein the number is ³ or more. 11. The inorganic powder has a refractive index of 1.48 to 1.52.
The resin film according to any one of claims 7 to 10, wherein 12. The content of the inorganic powder in the film is from 1 to 3.
The resin film according to any one of claims 7 to 11, wherein the content is 0% by weight. 13. The resin film according to claim 7, further comprising at least one selected from the group consisting of a hindered amine compound, an ultraviolet absorber, an anti-fogging agent and an anti-fog agent. 14. The resin film according to claim 7, which has an antifogging coating layer on at least one side. 15. A method for cultivating a crop, wherein the method is carried out in a horticultural facility using the resin film according to any one of claims 6 to 14.