JP2002240217A - Multilayer film of thermoplastic resin for agriculture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multilayer film of a thermoplastic resin for agriculture which is not flawed by a film holding band such as a mica wire because of its excellence in flaw resistance, which is free of deterioration of transparency due to sticking of dust because of its excellence in dustproof properties, and further which is free of thermal welding even when it is left outdoors in summertime. SOLUTION: The multilayer film of the thermoplastic resin for agriculture is constituted of an inner layer A, an intermediate layer B and an outer layer C at least. A compound of a specific polypropylene copolymer composition is used for either the inner layer A or the outer layer C or both of them.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agricultural thermoplastic resin multilayer film used as a covering material for a house or a tunnel. More specifically, the present invention relates to an agricultural thermoplastic resin multilayer film that is excellent in damage resistance when a film holding band such as a mica wire is used, hardly adheres dirt such as dust, and hardly heat-bonds each other even in summer.

[0002]

2. Description of the Related Art Various plastic films have been used as covering materials for horticulture such as agricultural houses and tunnels. Typical examples thereof include a polyvinyl chloride film (hereinafter, referred to as agricultural plastic), a polyethylene film (hereinafter, referred to as agricultural plastic), an ethylene vinyl acetate copolymer film (hereinafter, referred to as agricultural plastic). it can.

[0003] Above all, agricultural rice has heat retention, transparency, toughness,
Because it is excellent in anti-fog properties, house adhesion and economic efficiency,
Most commonly used, the plasticizer contained in agricultural vegetation gradually oozes out on the film surface, making it easy for dust to adhere, resulting in a decrease in transparency due to dust adhesion and affecting crop yield. Was giving. In recent years, it has been proposed to apply an acrylic resin to an outer layer surface for the purpose of preventing dust from adhering to some agricultural vines, but a sufficient effect has not been obtained. There is also a problem that, for example, harmful gases are generated when incinerated for disposal after use. Therefore, there is a demand for agricultural viable alternatives that do not generate harmful gases.

[0004] On the other hand, agricultural poly and agricultural vinegar are superior to agricultural plastics in terms of dustproofness and ease of disposal, but the occurrence of scratches due to film holding bands such as mica wire and the resulting There are problems such as tearing of the film and thermal fusion between the films when left outdoors in summer, and improvements have been desired.

In recent years, linear low-density polyethylene, which is an ethylene-α-olefin copolymer using a single-site catalyst instead of a conventional multi-site catalyst, has been developed.
Japanese Patent Application Laid-Open No. 09-052332 discloses that the density is 0.925.
~0.940g / cm ³ of the outer layer comprising an ethylene -α- olefin copolymer (house or tunnel layer in contact with the outer atmosphere), density 0.880~0.910g / cm ³
And an inner layer made of an ethylene-α-olefin copolymer having a density of 0.905 to 0.930 g / cm ³ (a layer in contact with the atmosphere inside a house or a tunnel). ) Is laminated, and in JP-A-08-276542, an ethylene-vinyl acetate copolymer is used as an intermediate layer.
Ethylene-α with single-site catalyst in inner and outer layers
-Multi-layer agricultural films using olefin copolymers have been proposed.

[0006] These agricultural multilayer films are slightly improved in the scratch resistance as compared with the conventional films, but the above-mentioned problems with respect to the dust resistance and the heat fusion resistance have not been solved.

[0007] When polypropylene is used for the outer layer and inner layer of the agricultural laminated film, the laminated film is made of 1
Although it has the durability of the season, it has not been put to practical use because of its poor weather resistance compared to other olefin-based films.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to prevent scratches due to a film holding band such as mica wire due to excellent scratch resistance, and to prevent deterioration in transparency due to dust adhesion due to excellent dust resistance. Another object of the present invention is to provide an agricultural thermoplastic resin multilayer film which does not generate heat fusion even when left outdoors in summer.

[0009]

Means for Solving the Problems The present inventors have conducted intensive studies to improve the problems of the prior art, and as a result, have found that the agricultural thermoplastic resin multilayer comprising at least an inner layer A, an intermediate layer B and an outer layer C. A film, in which one or both of the inner layer A and the outer layer C is composed of a specific polypropylene-based copolymer composition, and the agricultural thermoplastic resin multilayer film can solve the above problems. The present invention was completed based on this finding.

The present invention comprises the following. (1) At least the inner layer A, the intermediate layer B and the outer layer C
Agricultural thermoplastic resin multilayer film comprising:
And one or both of the outer layers C is propylene
Propylene-α-olefin having a content of 90% by weight or more
Random copolymer (E) and propylene content of 55
% To 90% by weight of propylene-α-olefin run
Dam copolymer (F), comprising propylene-α-ole
Intrinsic viscosity [η] of fin random copolymer (F)_FBut
1.3 to 3.5 dl / g, propylene-α-ole
The intrinsic viscosity of the fin copolymer (E) is [η]_EAnd when
Intrinsic viscosity ratio [η]_F/ [Η]_EIs 0.5 to 1.3
And a propylene-α-olefin copolymer (E)
Weight W_EAnd a propylene-α-olefin copolymer
(F) weight W_FAnd these weight ratios W_E/
W_FAnd intrinsic viscosity ratio [η] _F/ [Η]_E([Η]_F
/ [Η]_E) × (W_E/ W_F) Is in the range of 0.7 to 4.5
Of the propylene copolymer composition (X) in
Composed agricultural thermoplastic multilayer film.

(2) The agricultural thermoplastic resin multilayer according to the above (1), wherein the thermoplastic resin of the compound constituting the intermediate layer B is the propylene-based copolymer composition (X). the film.

(3) The blend of the propylene copolymer composition (X) constituting one or both of the inner layer A and the outer layer C has a BET specific surface area of 5 to 50 m ² / g.
The agricultural thermoplastic resin multilayer film according to the above (1), wherein the inorganic filler contains 1 to 10% by weight.

(4) The blend of the propylene copolymer composition (X) constituting the intermediate layer B has a BET specific surface area of 5 to 5.
The agricultural thermoplastic resin multilayer film according to the above (1) or (2), further comprising 1 to 20% by weight of an inorganic filler of 50 m ² / g.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the agricultural thermoplastic resin multilayer film according to the present invention will be described in detail.

In the present invention, polypropylene-α- which is a component constituting the polypropylene-based copolymer composition (X) used in one or both of the inner layer A and the outer layer C is used.
The olefin random copolymer (E) has a polypropylene content of 90% by weight or more, preferably 90% by weight or more.
It is a random copolymer of 8% by weight or less, more preferably 94% by weight or more and 98% by weight or less. If the propylene content is less than 90% by weight, the heat resistance at the time of film formation and the heat fusion resistance of the obtained agricultural thermoplastic resin multilayer film may be reduced.

In the polypropylene-α-olefin random copolymer (E), the α-olefin to be copolymerized with propylene is not particularly limited, but specific examples thereof include ethylene, 1-butene, 1-pentene and 1-pentene. -Hexene, 1-octene, 1-decene, 1-dodecene, 4-
Methyl-1-pentene, 3-methyl-1-pentene and the like can be mentioned. These α-olefins may be used alone or in combination of two or more. Of these, the use of ethylene is preferred in terms of production cost.

The propylene-α-olefin random copolymer (F), which is a component constituting the polypropylene copolymer composition (X), has a propylene content of 55%.
It is a random copolymer of 90 to 90% by weight, preferably 55 to 85% by weight. When the propylene content exceeds 90%, the impact resistance and flexibility at low temperature of the agricultural thermoplastic resin multilayer film obtained are insufficient, and when the propylene content is less than 55% by weight, the transparency of the multilayer film is reduced.・ Scratch resistance and dust resistance may decrease.

In the propylene-α-random copolymer (F), the α-olefin to be copolymerized with propylene is not particularly limited, but specific examples thereof include ethylene, 1-butene, 1-pentene and 1-pentene. Hexene, 1-octene, 1-decene, 1-dodecene, 4-methyl-1-
Penten, 3-methyl-1-pentene and the like can be mentioned. These α-olefins may be used alone or in combination of two or more. Of these, the use of ethylene is preferred in terms of production cost.

The propylene-α-olefin random copolymer (F) has an intrinsic viscosity [η] _F measured in tetralin at 135 ° C. of 1.3 to 3.5 dl / g, more preferably 1.5 to 3.5 dl / g. The intrinsic viscosity ratio [η] _F / [η] _{E of} 3.0 dl / g and intrinsic viscosity [η] _E measured in tetralin at 135 ° C. of the propylene-α-olefin random copolymer (E). Is 0.5 to 1.3, preferably 0.6 to 1.2.

The intrinsic viscosity [η] _F affects the transparency of the propylene-based copolymer composition (X), and the intrinsic viscosity ratio [η] _F / [η] _E is defined as propylene-α-olefin random. This affects the dispersibility of the copolymer (F) in the propylene-α-olefin random copolymer (E). The lower the intrinsic viscosity [η] _{F of the} propylene-α-olefin random copolymer (F), the smaller the _F is, the more the productivity of the agricultural thermoplastic resin multilayer film is improved, and the intrinsic viscosity ratio [η] _F / [η] _E
Is within the above range, the transparency is excellent.

The propylene copolymer used in the present invention
Composition (X) is propylene-α-olefin random
Weight of copolymer (E) is W_EAnd propylene-α-O
The weight of the refin random copolymer (F) is expressed by W_FAnd
And its weight ratio W_E/ W_FAnd the intrinsic viscosity ratio [η]_F/
[Η]_E([Η]_F/ [Η]_E) × (W_E/
W _F) Is from 0.7 to 4.5. The intrinsic viscosity ratio
Propylene copolymerization when the product of the weight ratio is less than 0.7
The film forming property of the body composition (X) is lowered,
And impact resistance of used agricultural thermoplastic resin multilayer films
Impactability and surface smoothness may be reduced.

The specific composition of the propylene copolymer composition (X) used in the present invention is such that the propylene-α-olefin random copolymer (F) is 10% based on the above composition.
５０50% by weight. When the propylene-α-olefin random copolymer (F) is within this range, the propylene-based copolymer composition (X) and the obtained agricultural thermoplastic multilayer film have scratch resistance, dust resistance, transparency, and toughness. Is excellent.

The melt flow rate of the propylene-based copolymer composition (X) (230 ° C., load 21.18 N, hereinafter M
FR) is preferably 0.1 to 50 g / 10 minutes from the viewpoint of the moldability of the propylene-based copolymer composition (X) and the appearance of the obtained agricultural thermoplastic resin multilayer film,
0.2-20 g / 10 min is more preferred. When the MFR is less than 0.1 g / 10 minutes, the film-forming property is reduced and the MFR is reduced to 50 g / 1.
If the time exceeds 0 minutes, the surface smoothness of the multilayer film may be reduced, and the dust resistance, transparency and toughness may be insufficient.

The propylene copolymer composition (X) used in the present invention may be produced by any method as long as the above-mentioned various properties are satisfied. Of course, the propylene-α-olefin random copolymer (E) and the propylene-α-olefin copolymer (F) which are separately produced and used in the present invention are mixed using a mixing apparatus, and the propylene-based copolymer is mixed. Although the composition (X) may be produced, preferably, the composition of International Publication W
O97 / 19135, JP-A-10-316810
Propylene-α-olefin random copolymer (E) is produced using a supported titanium-containing solid catalyst and an organoaluminum compound using an olefin polymerization catalyst, followed by propylene-α- Propylene-α in the presence of the olefin random copolymer (E)
-Producing an olefin random copolymer (F) and continuously producing a propylene-based copolymer composition (X). The propylene-based copolymer composition (X) can be produced by the above-described method, or can be used by selecting a product having desired specifications from commercial products.

When the propylene-α-olefin random copolymer (E) and the propylene-α-olefin random copolymer (F) are continuously produced to obtain the propylene-based copolymer composition (X) Since the intrinsic viscosity [η] _F of the propylene-α-olefin random copolymer (F) in the propylene-based copolymer composition (X) cannot be directly measured, the propylene-α-olefin random copolymer which can be directly measured is used. the intrinsic viscosity _{[eta] E} and propylene copolymer composition (X) across the intrinsic viscosity of polymer (E) _{[η] W HOLE}
And the weight% W _F of the copolymer obtained by the following equation (1). _{[Η] F = {[η} ] WHOLE - (1-W F / 100) [η] E} / (W F / 100). . . (1)

In the present invention, the thermoplastic resin used in the composition constituting the inner layer A or the outer layer C when the above-mentioned polypropylene copolymer composition (X) is not used is not particularly limited. Examples include homopolymers of monomers such as vinyl, ethylene, propylene, acrylates, and methacrylates, and copolymers of two or more monomers with monomers that can be copolymerized with these monomers. You. Among them, a polyolefin-based resin is preferably used in terms of recyclability, lightness and the like.

The polyolefin resin includes a density
0.88 to 0.92 g / cm³Low density polyethylene,
Linear low-density polyethylene, density 0.94 to 0.97 g /
cm ³High density polyethylene, vinyl acetate content of 3 ~
8% by weight or less of an ethylene-vinyl acetate copolymer;
Density 0.88 ~ polymerized with single site catalyst
0.92g / cm³Of ethylene-α-olefin
The body is preferably used in terms of transparency and price.

In the present invention, the thermoplastic resin used in the composition constituting the intermediate layer B is not particularly limited, but may be a monomer such as vinyl chloride, ethylene, propylene, acrylate or methacrylate. Examples thereof include a homopolymer, a binary copolymer of a monomer copolymerizable with these monomers, and the like. Among them, a polyolefin-based resin is preferably used in terms of recyclability, lightness and the like.

The polyolefin resin may have a density
0.88 to 0.92 g / cm³Low density polyethylene,
Linear low-density polyethylene, density 0.94 to 0.97 g /
cm ³High density polyethylene with a vinyl acetate content of 10
To 25% by weight of an ethylene-vinyl acetate copolymer;
Density 0.88 ~ polymerized with single site catalyst
0.92g / cm³Of ethylene-α-olefin
And the polypropylene-based copolymer composition (X)
But especially the polypropylene-based copolymer composition
Strength of thermoplastic resin multilayer film from which product (X) is obtained
It is preferable because of its superiority.

The polypropylene-based copolymer composition (X) used in the composition constituting the intermediate layer B is the polypropylene-based copolymer composition used in the composition constituting the inner layer A and the outer layer C. the same thing can be used as (X), the intrinsic viscosity of the propylene -α- olefin random copolymer _{(F) [η]} F is 2.0~3.5dl / g,
The intrinsic viscosity ratio _{[η] F / [η]} E is 0.7 to 1.3, the weight ratio _W E / _{W F} and the intrinsic viscosity ratio _[η] F / _[η] product of _{E ([η]} F / _{[η] E) × (W} E / W F) is 0.7
Polypropylene-based copolymer composition (X) in the range of 1.0
Is preferred from the viewpoint of the flexibility and tensile strength of the obtained agricultural thermoplastic resin multilayer film.

The composition constituting the inner layer A, the intermediate layer B and the outer layer C of the agricultural thermoplastic resin multilayer film of the present invention includes:
For the purpose of improving the heat retention of the multilayer film, an inorganic filler can be added. As the inorganic filler, silicon oxide, magnesium silicate, aluminum silicate,
Silicate compounds such as calcium silicate, aluminosilicate compounds such as calcium aluminosilicate, sodium aluminosilicate, potassium aluminosilicate, aluminate compounds such as alumina, sodium aluminate, potassium aluminate, calcium aluminate, calcium carbonate, the following formula (2) ) Or one or more inorganic fillers selected from the group consisting of a lithium-aluminum composite hydroxide salt represented by the formula (3) and hydrotalcites represented by the following formula (4).

[Al ₂ Li (OH) ₆ ] ₂ (A ⁿ⁻ ) · mH ₂ O. . . (2) (In the formula, ^An- is an n-valent anion, and m is a number of 3 or less.)

[0033] ^{_{[Al 2 (Li (1-}} x) · M 2+ x) (OH) 6] 2 · (Si y O 2y + 1 2-) 1 + x · mH 2 O. . . (3) (wherein, M ²⁺ is a divalent metal, m is a number in the range of 0 ≦ m <5, x is a number in the range of 0 ≦ x <1, and y is 2 ≦ y ≦
Indicates a number in the range of 4. )

M 2 ⁺ _1-x Al _x (OH) ₂ (A ⁿ⁻ ) _{x / 2} · mH ₂ O. . . (4) ^{(wherein, M 2+} is ^{Mg 2+, Ca} 2+, and represents at least one divalent metal ion selected from among ^{Zn 2+, A n-} is an n-valent anion, x and m the following Condition, 0
<X <0.5, 0 ≦ m ≦ 2. )

As the inorganic filler, JIS Z
BET specific surface area measured according to 8830 is 5-50
Those having m ² / g, preferably 5 to ²⁰ m ² / g are suitably used. When the BET specific surface area exceeds 50 m ² / g, the antifogging agent and the antifog agent are adsorbed by the inorganic filler and are not easily transferred to the film surface, so that the antifogging performance and the antifogging performance may not be obtained. If it is less than 5 m ² / g, the anti-fogging agent and anti-fog agent are not adsorbed to the inorganic filler and transfer to the film surface proceeds promptly, and the film becomes sticky, and the anti-fogging and anti-fog properties are persistent. Becomes insufficient.

The addition ratio of the inorganic filler to the components constituting the inner layer A and the outer layer C is preferably from 1 to 10% by weight. When it exceeds, the transparency may be reduced. The addition rate of the inorganic filler to the composition constituting the intermediate layer B is preferably from 1 to 20% by weight, and if the addition amount is less than 1% by weight, the heat retaining property is insufficient. Characteristic may be degraded.

In the present invention, the compounds constituting the inner layer A, the intermediate layer B and the outer layer C are added to the modifying resins and additives usually used in agricultural films as long as the object of the present invention is not impaired. Can be blended. Examples of the additive include a hindered amine-based weathering agent, an ultraviolet absorber, an anti-mist agent (fluorinated surfactant), an antistatic agent, a lubricant, an antioxidant, a heat stabilizer, an antibacterial agent, a coloring agent and a coloring agent. be able to.

As a method for obtaining the compounds constituting the inner layer A, the intermediate layer B and the outer layer C, a desired additive is added to a thermoplastic resin used for each layer, and a high-speed additive such as a Henschel mixer (trade name) is used. Examples thereof include a method of mixing with an ordinary compounding device such as a mixer equipped with a stirrer, a ribbon blender, and a tumbler mixer, and a method of pelletizing using an ordinary single-screw extruder or a twin-screw extruder.

The thickness of the agricultural thermoplastic resin multilayer film of the present invention varies depending on the place of use, the service life, and the like.
Generally, those having a thickness of about 0.05 to 0.3 mm are suitably used. The thickness T _a of the inner layer A, the thickness T _c of the thickness T _b and the outer layer C of the intermediate layer B but is not particularly limited, T _{a:
T b: T c = 1~5:} 1~5: 1~5 range is preferred.

The agricultural thermoplastic resin multilayer film of the present invention can be prepared by the inflation method or the T
It can be manufactured by a known technique such as a die method, and in addition to the intermediate layer B, an intermediate layer D having heat retention, an intermediate layer G for improving anti-fogging property, and an intermediate layer containing a recycled material. It may be a multilayer film of four or more layers in which layers H and the like are laminated. Further, a dust-proof coating agent, an anti-fogging coating agent, or the like may be applied and dried to form a coating film on the surface.

The agricultural thermoplastic resin multilayer film of the present invention may be transparent or matte, and may be used in an agricultural house (greenhouse),
It may be used for applications other than coating such as tunnels, such as mulching and bagging.

[0042]

EXAMPLES Hereinafter, the present invention will be described specifically with reference to Examples and Comparative Examples, but the present invention is not limited thereto. In addition, evaluation of the agricultural thermoplastic resin multilayer film in an Example and a comparative example was implemented by the following method.

1) Total light transmittance and haze: Measured according to JIS K 7105 using a color computer HGM-2K (manufactured by Suga Test Instruments Co., Ltd.). The smaller the haze value, the better the transparency.

2) Scratch resistance; Gakushin abrasion tester (Co., Ltd.)
Measuring the haze H ₀ before wear and haze H ₁ after being worn 5000 times under conditions of a load 300g film outer surface with flannel cloth with a Yasuda Seiki Seisakusho), the difference between the haze measurement before and after abrasion ΔH = was the _H 1 -H ₀ and injury of the measure. Δ
The smaller the value of H, the better the scratch resistance.

3) Dust proofing property; 30 cm in length and 5 in width in outdoor field
The film sample was stretched and fixed on a frame of 0 cm × 30 cm in height, and evaluated by haze measurement of the film sample on the side surface of the frame after three months.

4) Heat-fusing property: A film roll sample having a width of 20 cm and a length of 100 m was left in a thermostat at 95 ° C. for 24 hours, and then the film was peeled off by hand to evaluate the peeling property according to the following three grades. ：: easy peeling without fusing. △: slight fusing occurred, peeled off part seemed to be white. ×: severe fusing, peeling impossible.

5) Weather resistance: Irradiation was performed for 2000 hours using a weather meter (Sunshine carbon arc lamp type, manufactured by Suga Test Instruments Co., Ltd.) according to JIS K 6732 at a black panel temperature of 63 ° C. with rain. ,
The haze, tensile strength residual ratio and elongation residual ratio were measured. The tensile test conformed to JIS K 6732.

5) Density: measured according to JIS K7112.

6) Melt flow rate; JIS K7
The measurement was performed at 190 ° C. and 21.18 N (polyethylene resin) or 230 ° C. and 21.18 N (polypropylene resin) in accordance with No. 210.

7) Intrinsic viscosity; using tetralin (tetrahydronaphthalene) as a solvent under a temperature environment of 135 ° C.
Automatic Viscometer (AVS2, Mitsui Toatsu Chemicals, Inc.)
), The intrinsic viscosity [η] _{E of} the propylene-α-olefin random copolymer (E) extracted from the middle of the polymerization process, and then the intrinsic viscosity [η] of the propylene-based copolymer composition “X”. _WHOLE was measured directly. The intrinsic viscosity [η] _F of the propylene-α-olefin random copolymer (F) was calculated from the following equation using the values of [η] _E and [η] _WHOLE . _{[Η] F = {[η} ] WHOLE - (1-W F / 100)
_{[Η] E} / (W} F / 100) W F: propylene -α- olefin random copolymer produced amount of (F) _{[η] WHOLE:} propylene copolymer composition (X)
Intrinsic viscosity of

8) Propylene content: 1760X manufactured by Perkin-Elmer Co., Ltd.
It measured with the FT-IR apparatus.

9) Weight of propylene-α-olefin random copolymers (E) and (F); Mg content in the polymer obtained in the polymerization step was determined by high frequency inductively coupled plasma emission spectroscopy (ICP method). The weights of the random copolymers (E) and (F) were calculated from the polymer yield per unit weight of the catalyst.

Examples 1 to 10 and Comparative Examples 1 to 8 In accordance with the composition of each layer of the thermoplastic resin multilayer film shown in Tables 1 and 2 and the common composition described later, a composition for each layer was prepared. . Using the obtained compound, a multilayer film having a thickness of 0.1 mm was formed at a molding temperature of 210 ° C. by using a three-type three-layer T-die extruder having one 65 mmφ extruder and two 45 mmφ extruders. A film was formed. The thickness ratio of each layer of the multilayer film is outer layer: intermediate layer: inner layer = 1: 3: 1.

The symbols and contents of the resins used in the compounds constituting each layer of the multilayer film shown in Tables 1 and 2 are as follows. LDPE: low density polyethylene, NUC8505 (manufactured by Nippon Unicar Co., Ltd.), MFR (190 ° C.) = 0.8 g /
10 minutes, density = 0.92 g / cm ³ LLDPE: linear low density polyethylene, TUF206
0 (manufactured by Nippon Unicar Co., Ltd.), MFR (190 ° C.) = 1.
0 g / 10 min, density = 0.92 g / cm ³ EVA (15%): ethylene-vinyl acetate copolymer having a vinyl acetate content of 15% by weight, NUC8452D (manufactured by Nippon Unicar Co., Ltd.), MFR (190 ° C.) = 1.0 g / 10
Min, density = 0.94 g / cm ³ EVA (5%): ethylene-vinyl acetate copolymer having a vinyl acetate content of 5% by weight, NUC3250 (manufactured by Nippon Unicar Co., Ltd.), MFR (190 ° C.) = 1. 5 g / 10 min, density = 0.93 g / cm ³ M-PE: single-site catalytic ethylene-α-olefin copolymer, Elite 5400 (manufactured by Dow Chemical Co., Ltd.), MFR (190 ° C.) = 1. 0 g / 10 min, density = 0.92 g / cm ³

PP: polypropylene, XF1810
(Manufactured by Chisso Corporation), MFR (230 ° C.) = 1.8 g /
10 minutes, density = 0.90 g / cm³ PP copolymer X2: polypropylene-based copolymer composition
(X), NF4013 (manufactured by Chisso Corporation), W_E/ W_F=
1.0, intrinsic viscosity [η]_WHOLE= 2.4 dl / g,
Intrinsic viscosity ratio [η]_F/ [Η]_E= 0.8, ([η]_F/
[Η]_E) × (W _E/ W_F) = 0.8, MFR (230
° C) = 2.5 g / 10 min PP copolymer X1: polypropylene-based copolymer composition
(X), NF1702 (Chisso Corporation), W_E/ W_F=
4.0, intrinsic viscosity [η]_WHOLE= 2.05dl /
g, intrinsic viscosity ratio [η]_F/ [Η]_E= 1.0, ([η]
_F/ [Η]_E) × (W_E/ W_F) = 4.0, MFR (2
30 ° C.) = 2.5 g / 10 minutes

The common compounding composition of each of the multilayer films shown in Tables 1 and 2, excluding the resin, is based on the compounding formula.
In outer layer A, 3% by weight of hydrotalcite, 0.3% by weight of hindered amine-based weathering agent, 0.05 of ultraviolet absorber
Wt%, phenol stabilizer 0.1 wt%, phosphorus stabilizer 0.1 wt%, antiblocking agent 0.05 wt%
In the middle layer B, 7.0% by weight of hydrotalcite, 2.0% by weight of antifogging agent, 0.3% by weight of hindered amine weathering agent, 0.05% by weight of ultraviolet absorber, and 0.1% by weight of fluorine surfactant. 2% by weight, 0.1% by weight of phenolic stabilizer, 0.1% by weight of phosphorus stabilizer, 3% by weight of hydrotalcite, 0.3% by weight of hindered amine weathering agent, UV absorber in inner layer C 0.05% by weight, 0.2% by weight of a fluorine-based surfactant, 0.1% by weight of a phenolic stabilizer, 0.1% by weight of a phosphorus-based stabilizer, and 0.05% by weight of an antiblocking agent.

[0057]

[Table 1]

[0058]

[Table 2]

[0059]

The agricultural thermoplastic resin multilayer film of the present invention has improved scratch resistance due to a film holding band such as mica wire, is less susceptible to dirt and the like, and is heat-sealed in summer. This is an agricultural thermoplastic resin multilayer film that prevents such a phenomenon, and has a small decrease in light transmittance. The film is not fused even when the film is rolled up for spreading work under sunlight in summer or for ventilation. In a horticultural facility such as a house using the film of the present invention, high-quality crops can be stably harvested at a high yield, and operations such as ventilation are easy.

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Koichi Fukuda 5-1, Goi Kaigan, Ichihara City, Chiba Prefecture Chisso Petrochemical Co., Ltd. Processed Products Development Laboratory F-term (reference) 4F100 AA00A AA00B AA00C AA00H AK01B AK01C AK64A AK64B AK64C AK66A AK66B AK66C AL05A AL05B AL05C BA03 BA10A BA10C BA16 CA23A CA23B CA23C CA23H GB01 JA06A JA06B JA06C JA20A JA20B JA20C JA20H JJ03 JK14 JL00 JL06 JN01 YY00A YY00H 4J002 BB13W BB13DJ BB13DE 01613

Claims (4)

[Claims] 1. An agricultural thermoplastic resin multilayer film comprising at least an inner layer A, an intermediate layer B and an outer layer C,
One or both of the inner layer A and the outer layer C has a propylene content of 90% by weight or more.
An olefin random copolymer (E) and a propylene-α-olefin random copolymer (F) having a propylene content of 55% to 90% by weight;
-Intrinsic viscosity [η] of olefin random copolymer (F)
_F is 1.3 to 3.5 dl / g, and propylene-α-
When the intrinsic viscosity of the olefin copolymer (E) is [η] _E , the intrinsic viscosity ratio [η] _F / [η] _E is 0.5 to 1.3.
, And the and propylene -α- olefin copolymer weight (E) and _{W E,} when the propylene -α- olefin copolymer the weight of (F) was _{W F,} these weight ratios _W E / W _F and the intrinsic viscosity ratio _[η] F / _[η] product of _{E ([η] F / [} η] E) × (W E / W F) is 0.7
Propylene copolymer composition (X) in the range of 4.5
Agricultural thermoplastic resin multilayer film composed of the compound of the above. 2. The agricultural thermoplastic resin multilayer film according to claim 1, wherein the thermoplastic resin of the composition constituting the intermediate layer B is the propylene-based copolymer composition (X). 3. An inorganic filler having a BET specific surface area of 5 to 50 m ² / g, wherein the composition of the propylene copolymer composition (X) constituting one or both of the inner layer A and the outer layer C is The agricultural thermoplastic resin multilayer film according to claim 1, comprising 1 to 10% by weight. 4. The blend of the propylene copolymer composition (X) constituting the intermediate layer B has a BET specific surface area of 5 to 50 m.
^The thermoplastic thermoplastic resin multilayer film according to claim 1 or 2, further comprising 1 to 20% by weight of an inorganic filler of ² / g.