JPS63286343A - Laminate film for agriculture - Google Patents

Abstract

PURPOSE:To improve the heat insulation property, transparency, abrasion resistance, durability and defogging endurance by providing at least one kind resin layer selected from olefin resin group on the inner and outer surfaces of a film made of the composition to which the powder of specified hydrotalsite compound having the refractive index almost equal to that of olefin resin is added. CONSTITUTION:The film is made of the composition in which 1-25 pts.wt. hydrotalsite compound which is shown by the formula M(1-x).Alx(OH)2.Xx/ n.mH2O (M shown alkaly earth metal and Zn, and X shows n value anion, and further x and m satisfy 0<x<0.5, 0<=m<=2), and has 1.47 or more and 1.52 or less refractive index, is compounded with 100 pts.wt. olefin resin. On the inner and outer surface of said film, at least one kind resin layer selected from olefin resin group is provided. As the olefin resin used for an intermediate layer, a low density polyethylene with 0.910-0.935 g/cm<3> density or ethylene-alpha- olefin copolymer and an ethylen-vinyl acetate copolymer having 30 wt.% or less content of vinyl acetate, are preferable.

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention relates to an agricultural laminated film based on an olefin resin that has improved heat retention, transparency, abrasion resistance, durability, and landscape sustainability. .

"Conventional Technology" Traditionally, greenhouse covering materials used for greenhouse cultivation such as agricultural greenhouses and tunnel 7" greenhouses have been polyolefin resin films such as polyvinyl chloride film, polyethylene film, and ethylene-vinyl acetate copolymer film. is mainly used.

Among these, polyvinyl chloride film has been widely used in this field until recently because it has excellent heat retention, transparency, toughness, and durability. However, during use, polyvinyl chloride film has the disadvantage that the plasticizer contained in the film bleeds onto the film surface, causing dust to adhere to it, severely impairing its light transmittance and preventing the temperature rise inside the greenhouse. When incinerated after use, hydrochloric acid gas is generated, making it difficult to dispose of. Furthermore, it loses its flexibility at low temperatures and is resistant! There is also the problem that it cannot withstand use in cold regions due to poor I impact resistance.

On the other hand, Olefin 14 No. 1371 film does not contain plasticizers and has a stable chemical structure, so its light transmittance hardly changes even during long-term use, and no harmful gases are generated even when incinerated. In terms of heat retention, it is superior to polyvinyl chloride film, but it is inferior to polyvinyl chloride film in terms of heat retention. Therefore, although the olefin resin film has the advantage of long-lasting light transmittance, it has not been used as a 97% thin coating film.

Among olefin resins, ethylene-vinyl acetate copolymer film has been recognized to have advantages such as transparency, flexibility, and cold resistance, and has recently been used as a covering material for agriculture, but polyvinyl chloride has better heat retention. In addition to the above-mentioned problem that the friction strength is inferior to that of the pipe house, there is also the problem that the friction strength is inferior. There is a problem that the film is damaged due to friction.

In general, the heat retention properties of covering films in greenhouses and greenhouses prevent the temperature inside the greenhouse from dropping at night! This is because the heat absorbed into the ground inside the greenhouse by sunlight during the day is radiated from the ground as radiation at night, keeping the temperature inside the greenhouse high. If the transmittance of radiation from the ground is high, the radiation from the ground will be dissipated outside the house, and the soil temperature inside the house will drop.As a result, the temperature inside the 7% greenhouse can be kept higher than the outside air. It disappears. Therefore, the quality of the heat retaining property of the coating film depends on the radiation absorption or reflection rate, and the higher the rate, the better.

As coating films with improved heat retention properties of olefin resin films, Japanese Patent Publication No. 47-9260 and Japanese Patent Publication No. 47-
No. 13853, JP-A-49-105843, JP-A-5
2-32938, JP 55-151043, JP 55-151044 and JP 60-104141
As can be seen in various publications such as No. 1, specific S fillers such as phosphate compounds, silicon oxide, anhydrous aluminosilicate, dehydrated kaolinite, aluminum, silicates, zeolites, and hydrotalcites are added to olefin resins. There is something. However, although these methods have improved the heat retention properties of olefin resins, they are still insufficient compared to polyvinyl chloride films.

Furthermore, 5-in.
2・T i O2, SiO□φMgO,5i02・Ca
Even if the heat retention properties are improved to the same level as polyvinyl chloride by the addition of composite hydrous materials such as O and SiO□・A LO, the biggest problem is that the addition of non-191 fillers
In ordinary film processing methods, such as the T-guicast method and the inflatable film method, the molten resin is cooled and solidified while being stretched, resulting in an uneven film surface. For this reason, the film is more likely to be damaged due to friction at the pipe section and the mica wire holding section of the Notsutausu, and more importantly, the transparency of the film, especially the parallel light transmittance, is lower than that of polyvinyl chloride film or ethylene film. A polyolefin agricultural film made of a combination of lume and multiple scraps has been proposed, which is inferior to a vinyl acetate copolymer film, but the refractive index of the W1 filler and the 191
Since the refractive index of the resin to which the filler is added is different, it was not possible to obtain a film with excellent parallel light transmittance.

[Problems to be Solved by the Invention J The present inventors have solved the above-mentioned problems of olefin resins as agricultural films, and have improved heat retention, transparency, abrasion resistance, and durability. In order to provide an agricultural film with excellent anti-fogging properties at a low price, we have conducted intensive research and developed a composition containing powder of a specific hydrotalcite compound that has a refractive index almost equal to that of olefin resins. By providing at least one resin layer selected from the group of olefin resins on the inner and outer surfaces of the film made of material, it is possible to achieve extremely superior parallel light transmittance, heat retention, abrasion resistance, durability, and anti-fog properties compared to conventional technology. The present invention was completed after discovering that a film with long-lasting properties could be obtained.

"Means for Solving the Problems" The gist of the present invention is that 1 to 25 parts by weight of the following general formula %, based on olefin P and 100 parts by weight of the resin, are represented by the following general formula %, where M is an alkaline earth metal and Zn. , X is n
Indicates a valent anion, and satisfies the conditions of the following formula.

The inner and outer surfaces of a film made of a composition containing a hydrotalcite compound having a refractive index expressed by 0.5 0 ≦ ≦ 2 in the range of 1.47 to 1.52 are coated with an olefin resin. There is provided an agricultural laminated film characterized by being provided with at least an IM resin layer selected from the group consisting of:

The present invention will be explained in more detail below.

In the present invention, the olefin resin used in the intermediate layer is a homopolymer of a-olefin, or a copolymer with a different monomer containing an a-olefin as a main component, such as polyethylene, polypropylene, ethylene propylene, etc. copolymers, ethylene-butene copolymers, ethylene-4-methyl-1-pentene copolymers, ethylene-vinyl acetate copolymers, ethylene-acrylic acid copolymers, and ionomer resins. Among these, the density is 0.910
Low-density polyethylene and ethylene-a-olefin copolymers with ~0.935 g/c+s and ethylene-vinyl acetate copolymers with a vinyl acetate content of 30% by weight or less are superior in terms of transparency, weather resistance, and price. It is preferable as an agricultural film.

Among them, the vinyl acetate content is 5% by weight or more and 25% by weight.
Among these, the following ethylene-vinyl acetate copolymers are particularly preferred in terms of transparency, flexibility, weather resistance, and the like.

In the present invention, the olefin resins used for the inner and outer layers also belong to the same category as the olefin resins used for the intermediate layer described above, but among these, resins with particularly good friction resistance are preferable. For example, polyethylene resins are preferable. If the density is 0.910 g/am' or more 0,'935 g/am'
Polyethylene or ethylene with a melt index of 0.1 g/10 minutes or more and 4 g/10 minutes or less at am' or less
A-olefin copolymer is preferred, density is 0.910
If the density is less than 0.935g/cm', it is unfavorable in terms of heat resistance, and if the density is less than 0.935g/cm', it is unfavorable in terms of transparency.In addition, if the melt index is less than 0.1g/710 minutes, it is unfavorable in terms of processability. 4 g/10 minutes or more is undesirable in terms of friction properties and strength.Among these polyethylenes, ethylene-a olefin copolymer produced by a medium-low pressure method is particularly preferred in terms of heat resistance and durability. .

In the case of an ethylene-vinyl acetate copolymer, the vinyl acetate content is 15 parts by weight or less, more preferably 10% by weight.
Melt index below 0.1g/4g for 10 minutes or more
/10 minutes or less, more preferably 0.1g/10 minutes or more1
, 5.710 minutes or less is preferable. If the vinyl acetate content is 15 parts or more, it is unfavorable in terms of heat resistance, and if the melt index is 0.1 g/10 minutes or less, it is 4 g/10 minutes in terms of processability. The above is unfavorable in terms of friction characteristics and strength.

In the case of an ethylene-acrylic acid copolymer, the acrylic acid content is preferably 30% by weight or less, more preferably 25% by weight or less.

Preferably, the ionomer resin has a density of 0.935 g/C to 0.9751 y/em" and a melt index of 0.5 g/10 min to 7 g/10 min, with the metal ions being Na", Zn- type is preferred.

Among the resins mentioned above, ionomer resins and ethylene-acrylic acid copolymers are particularly suitable for the present invention because of their excellent friction resistance properties.

The hydrotalcite compounds used in the present invention have the general formula %, where M represents an alkaline earth metal and VZn.
X represents a monovalent anion.

And 1, and - satisfy the conditions of the following formula.

It is a hydrotalcite compound having a refractive index of 1.47 or more and 1.52 or less expressed by O<, <O, SO≦−≦2.

Examples of monovalent anions represented by X in the above formula include Cl-1Br-1-1NO, ClO4-1
SO-1, CO2-1SiO,”, HP O,”-1H
B O,”-1P 0.3-1Fe, (CN)-Ko,
Examples include Fe(CN)4'-1CH, CO, and other anions.

Although the first hydrotalcite compound used in the agricultural laminated film of the present invention is not particularly limited, in order to particularly improve the parallel light transmittance, film processability, physical properties, etc. It is preferable that the particle size is 5 μm or less and the BET specific surface area is 30 m′/g or less.

In the present invention, it is preferable that the hydrotalcite compound is used after being treated with a surface treatment agent6. By surface treatment, the dispersibility or affinity for olefin resins is further improved, and the processability and physical properties of the film are improved. Parallel light transmittance is also improved.

Examples of such surface treatment agents include, for example, sodium laurate, potassium laurate, sorg oleate, and olein f1! Alkali metals of higher fatty acids such as potassium, sodium stearate, potassium stearate, sorg palmitate, potassium palmitate, sodium caprate, potassium caprate, sodium myristate, potassium myristate, sodium ripple, potassium linoleate, etc. Salts: such as lauric acid, palmitic acid, oleic acid, stearic acid, capric acid, myristic acid, 9-noryl acid, etc. 1i primary fatty acids; inpropyl triisostearoyl titanate, isopropyl tris(!/octylpa phosphate) titanate, tetraisopropyl bis(dioctylphos 7 phyto) titanate, vinyltriethoxysilane, gamma tacryloxypropyltrimethoxysilane, The following are examples of coupling agents such as pyrutrimethoxysilane and the like.

Surface treatment with these surface treatment agents can be carried out, for example, by adding an aqueous solution of alkaline earth salts of higher fatty acids to a suspension of hydrotalcites in hot water, or by adding an aqueous solution of alkaline earth salts of higher fatty acids to a suspension of hydrotalcites in hot water. This can be carried out by dropping a melt of a higher fatty acid or a diluted solution of a coupling agent while stirring the powder using a mixer such as a Henschel mixer. The roughness of these surface treating agents can be selected and changed as appropriate, but is suitably about 1 to about 10 percent by weight relative to the hydrotalcite compound.

Furthermore, a small amount of impurities such as other metal oxides may be included as long as the gist of the present invention is not impaired.

In addition, the blending ratio of the hydrotalcite compound to the oleic resin that forms the intermediate layer is generally 10 parts of the oleic resin.
It is preferably 1 to 25 parts by weight, and 2 to 20 parts by weight relative to 0 parts by weight.
Parts by weight are more preferable. If the amount of the compound is less than 1 part by weight, the effect of improving the heat retention of the obtained film will not be very noticeable, and if the amount is more than 25 parts by weight, the strength of the obtained film will decrease. This is not preferable because it lowers the temperature.

Furthermore, in order to improve the dispersion of the hydrotalcite compounds, the intermediate layer contains a dispersant such as sorbitan fatty acid ester such as nrubitan monostearate or glycerin fatty acid ester such as glycerin monostearate. It may be added in an amount of 0.1 to 3 parts by weight.

In addition, stabilizers, ultraviolet absorbers, lubricants, antifogging agents, and other various additives may be appropriately blended into both the intermediate layer and the inner and outer layers, as required.

When producing the agricultural laminated film of the present invention, in order to blend the hydrotalcide (I) compound and other resin additives into the base oleic resin, the necessary amounts of each are weighed, and the necessary amounts are weighed out using a ribbon blender, Banbury mixer, etc. A super mixer, an extruder, or any other conventionally known compounding machine or mixer may be used.

The total resin composition obtained in this manner may be formed into a film by a method known per se, for example, a normal molding method such as in-7 laser processing, calendar processing, T-shaped processing, etc.

A method for providing at least IN resin waste selected from the group of oleic 1% resins on the inner and outer surfaces of a film made of an oleic resin containing a hydrotalcite compound is to form each film and dry laminate,
A method of making a laminated film by heat lamination method etc.
If existing techniques are used, such as a method of extruding and laminating at least one resin selected from the group of oleic resins onto an oleic resin film containing a hydrotalcite compound, or a method of simultaneously forming a laminated film using a multilayer coextrusion method, In particular, a multilayer coextrusion method is preferred in terms of ease of molding, MWII adhesion of the resulting film, transparency, and cost.

Furthermore, since wide films are preferred for agricultural applications, multilayer inflation processing is preferable. Note that the inner and outer layers may be made of different types of resin, but considering the use of extruders, etc., the same type of resin is sufficient for normal purposes. It is.

In addition, the thickness of the film (intermediate layer) made of oleic resin containing such hydrotalcite compounds and the resin provided on the inner and outer surfaces (inner and outer layers) is determined depending on the end use and purpose, so it is not absolutely specified, The intermediate layer depends on the required level of heat retention and/) the blending ratio of hydrotalcite compound to the resin, but usually 20μ to 200μ is sufficient, and the inner and outer layers are placed outside the intermediate layer. The thickness can be any thickness that reduces the noise and exhibits abrasion resistance, and usually a thickness of about 5μ to 50μ is sufficient.

The laminated film according to the present invention may be transparent or matte,
Semi-matte is also acceptable, and can be used for covering agricultural greenhouses, tunnels, etc., as well as for mulching,
It can also be used for hanging.

Regarding the thickness of the film when three layers are laminated, it is preferable to have a thickness in the range of 0.03 to 0.3 in terms of strength and cost, and in particular, a thickness in the range of 0.05 to 0.2. preferable.

"Function" and [Effect] The agricultural laminated film of the present invention has the following functions and effects.

The agricultural laminated film of the present invention contains hydrotalcite as an inorganic filler in the intermediate layer, but since the hydrotalcite has almost the same refractive index as the olefin resin, light at the olefin P, tH1fff/filler interface The film does not cause scattering or reduce internal haze, and by providing filler-free resin waste on the inner and outer surfaces, the surface irregularities caused by filler generated during film processing are significantly improved. Since the external heat is also significantly reduced, a transparent film with very good parallel light transmittance can be obtained. Furthermore, the heat retention properties, which were a drawback of conventional polyolefin films, have been greatly improved to a level comparable to that of polyvinyl chloride films.

In addition, the laminated agricultural film of the present invention has filler-free resin waste with excellent friction resistance on the inner and outer surfaces, so that the friction resistance of the film obtained is f#L<good, and the toughness is improved. In addition, the surface irregularities generated during film processing are improved, and as a result, the accumulation of dust and contaminants on the film surface is suppressed, so the heat accumulation deterioration caused by these is improved and the durability is improved. Greatly improved.

Next, the agricultural laminated film of the present invention gradually bleeds out surfactants (such as antifogging agents) that have been adsorbed during processing due to the adsorption ability of hydrotalcite compounds, so that the film can be prevented from fogging over a long period of time. It has sustainability.

In addition, the hydrotalcium compound having a preferable refractive index in the present invention is produced by a known manufacturing method, and the addition to the olefin resin is a general addition used when making conventional agricultural films. The present invention provides an extremely superior olefin-based agricultural laminated film, as it is no different from other additives and can be added at the same time, so the manufacturing process of the prior art can be used, and it is generally easy to form a film. It is something to do.

Furthermore, since the agricultural laminated film of the present invention is mainly composed of olefin resin, it is essentially easy to incinerate, and there is no problem of generating particularly harmful substances when incinerated.

[Example 1] Next, the present invention will be explained with reference to Examples, but these Examples are merely illustrative and are not limited thereto.

Implementation N1 Ethylene-vinyl acetate copolymer with vinyl acetate content of 15% by weight (MI = 1.5 g/10 min, refractive index = 1.49
5) and a chemical composition Mga,yAl whose surface was previously treated with sodium stearate. ,! (OH)2(Co3). ,
1.・Average secondary particle size 0.3μ with 0.55H20
m, 5 parts by weight of a hydrotalcite compound (refractive index = 1.50) with a BET specific surface area of 12-2/g, 0.5 parts by weight of glyc7'monostearate as an antifogging agent and a dispersant, and polyglycerin. Stearley No. 1.0 weight section, 0.2 parts by weight of 2-hydroxy-4-octoxybenzo7enone was added as a weathering aid, and 21 pampa Q + = 5 at a resin temperature of 130 to 150 °C with a kisser. After kneading for a minute, the mixture was transferred to an extruder to produce granulated pellets.

The above mixture will be referred to as filler mixed resin.

The above-mentioned filler mixed resin is supplied to the middle layer by a two-type, three-layer inflation molding method, and the inner and outer layers are made of low-pressure low-density polyethylene resin (density = 0.924, MI = 2g7
10 minutes), and the thickness of each layer was 13μ-1 inside WA.
Three-layer Santoi composed of 50μ-1 outer layer and 13p layer;
A transparent film with a structure was obtained.

The inner and outer layers were also treated with the same anti-fogging agent and anti-weather and diarrhea formulation as the middle layer.

The results of measuring the heat retention, total light transmittance, parallel light transmittance, abrasion resistance, durability, and antifogging durability of the obtained film are summarized in Table #12.

Example 2 The hydrotalcite compound used in the intermediate layer in Example 1 was replaced with a hydrotalcite compound having the same chemical composition, average secondary particle diameter of 10 μ, and BET specific surface area of 50 cm/g. Example 1 was repeated except that a transparent film was obtained.

Example 3 Instead of the low-pressure low-density polyethylene resin used for the inner and outer layers in Example 1, Hymilan 1652 (trade name, manufactured by Mitsui Polychemical Co., Ltd.) (density: 94 g/cm, melt index: 5.0 g/10 minutes, A transparent film was obtained by repeating Example 1 except that Zn ion type (ethylene-methacrylic acid copolymer) was used instead.

Example 4 Instead of the low-pressure low-density polyethylene resin used for the inner and outer layers in Example 1, an ethylene-vinyl acetate copolymer containing vinyl acetate with an Ik of 5% by weight, a density of 0.92 g/cm, and a melt index of 2 [1/ A transparent film was obtained by repeating Example 1 except that the time was changed to 10 minutes).

Example 5 In place of the low-pressure low-density polyethylene resin used for the inner and outer layers in Example 1, high-pressure low-density polyethylene (density 0
, 925 g/Cm”, melt index 2g/
A transparent film was obtained by repeating Example 1 except that the time was changed to 10 minutes).

Example 6 In Example 1, instead of the ethylene-vinyl acetate copolymer used as the base of the filler mixed resin used for the intermediate layer, high-pressure low density polyethylene (L degree 0.925 g/C) was used.
Example 1 was repeated to obtain a transparent film, except that the same high-pressure low-density polyethylene as the intermediate layer was used instead of the low-pressure low-density polyethylene used for the inner and outer layers. Ta.

Example 7 The inner and outer layers of the filler mixed resin of the intermediate layer used in Example 6 were made of ethylene-acrylic acid copolymer (acrylic acid content 19.3% by weight, density 0.938 g/ell', Nord index 1.5 g/ell'). A transparent film was obtained by repeating Example 1 except that the time was changed to 10 minutes).

Example 8 The hydrotalcite compound of the intermediate layer used in Example 1 had a chemical composition of Mgo and 1sAI. , 34(OH)z
(Sio3). , 1.・0.52 H2O, average 2
A transparent film was obtained by repeating Example 1, except that it was replaced with ()hydrotalcyan) having a particle diameter of 0.4 μm and a BET specific surface area of 15 m27 g.

Comparative Example 1 In Example 1, 10.5 parts by weight of glycerin monostearate, 1.0 parts by weight of polyglycerin stearate, Granulated pellets were produced in the same manner as in Example 1 except that only 0.2 parts by weight of 2-hydroxy-4-octoxybenzo7enone was added as a weathering aid.

A single layer film of 76 μm was obtained from the granulated pellets by a single layer in-7 layer molding method.

Comparative Example 2 Filler mixed resin pellets were produced in the same manner as in Example 1, except that the blending ratio of the hydrotalcite compound in the filler mixed resin used for the intermediate layer in Example 1 was changed to 3.3 parts 1 part. Using this pellet, a monolayer film of filler mixed resin was obtained in the same manner and under the same conditions as in Comparative Example 1. The resulting film had slightly poor transparency.

Comparative Example 3 In place of the hydrotalcite compound of the filler mixed resin used for the intermediate layer in Example 1, silica sol with a loss on ignition of 10% by weight (refractive index 1.46.25°C and relative humidity 6) was used.
Adsorbed moisture at 5%, 15 overlapping parts, average particle size 2μ, BET
A film was obtained by repeating Example 1 except that the same amount of specific surface area (20 m'/g) was used. The obtained film was opaque, and its heat retention and anti-fog durability tended to be considerably inferior to those of the present invention.

Comparative Example 4 In place of the hydrotalcite compound in the filler mixed resin used for the intermediate layer in Example 1, ALo, 23% by weight, 261% by weight, previously dried at 250°C for 2 hours
, 10% by weight of Nazo, and 16% by weight of ignition loss aluminium non-ricade del (refractive index: 1.495.25°C, relative humidity: 65%, 18 overlapping parts of adsorbed moisture, average particle size: 5μ) were used in the same amount. A film was obtained by repeating Example 1 except for the following steps.

Table 1 shows a summary of the structure of the films of all the examples and comparative examples described above, and Table 2 shows the physical properties of the obtained films.

In addition, each physical property test in Examples and Comparative Examples was conducted as follows.

Measurement of average secondary particle size of hydrotalcite: Take about 2 to 3 times a sample on lath plate E, then add an appropriate amount of dispersion medium (trade name: Disrite) on top, and Thoroughly knead both. This system is then diluted by adding a small amount of cyclohexanol. Place one drop of this diluted solution on a slide glass and cover it with a bar glass.
The sample thus obtained is set in a microscope, its image is transferred to a blown-out TV image, and the number of particles for each maximum diameter is automatically counted. Select 20 different fields of view, repeat the same operation, and average the results.

Heat retention test: Heat retention was measured by placing a sample on one side of a box of approximately 80 square meters made of heat insulating material, and inserting a 100°C heating block into the box using heat retention measurement No. 1 tR. The temperature change inside the device was measured using a thermistor.

Standard sample agricultural polyvinyl chloride film thickness 0.0
The temperature difference from the value indicated by 75 theory is considered heat retention (67℃)
It is shown in the table.

Optical property test: The total light transmittance and parallel light transmittance of the film obtained in the present invention at a wavelength of 555 millimicrons were measured using a spectrophotometer (Hitachi new model EPS-ZU), and the values are shown. Ta.

Abrasion resistance test Ia: Using the U-F abrasion resistance test, attach the film test piece to the fixed side with paper file #400 on the corresponding If (side that moves left and right) to avoid wrinkles. The number of times the film was rubbed until the film broke was evaluated.

Note that the greater the number of tears, the better the abrasion resistance.

The values of the obtained film are shown in the table.

Durability test: On a closed test stand in the shape of a window frame, facing south and tilted at 45 degrees to the ground (Wkll location: Nagoya City, Aichi Prefecture)
Each film was exposed for 12 months starting in September 1960, a portion of the film was removed from the exposure test stand, and the appearance and elongation were evaluated using the following evaluation criteria.

○: There is no change in appearance and the remaining elongation rate is 80% or more.

Qx...No change in appearance, remaining elongation rate is 79-60
% range.

Δ: Appearance changes such as cracks and tears are partially observed, and the residual elongation rate is in the range of 79 to 60%.

ΔX: Significant changes in appearance such as cracks and tears are observed.
The retention rate of stretch marks is in the range of 59 to 40%.

× Fair: Cracks are observed over the entire surface or the remaining elongation rate is less than 40%.

Note that the residual elongation rate was calculated using the following formula.

Anti-fog durability test: Leap day 2-1 building height 2-1 depth 20 in a field in Nagoya City, Aichi Prefecture
The film was coated on a single-roof type house for 12 months starting in October 1960, and the antifogging properties of each film were periodically observed and evaluated with the naked eye.

The anti-fog durability evaluation shown in the table has the following significance.

○...Water remains in a thin film form and no water droplets are observed for 9 months or more after film coating.

Qx: Water has been attached in a thin film form for less than 9 months but more than 6 months after film coating, but slightly large water droplets are observed.

Δ: Water is attached in a thin film form less than 6 months after film coating, but large water droplets are observed to be attached in some areas.

As is clear from the above Examples and Comparative Examples, the film according to the present invention, that is, the film formed by laminating other olefin resins on the inner and outer surfaces of an olefin resin containing a specific hydrotalcite compound, is transparent. It can be seen that the film has excellent properties in terms of properties (parallel light transmittance), heat retention, abrasion resistance, durability, and anti-fog retention, making it extremely suitable as an agricultural film.

In addition, although heat retention and transparency can be achieved with a single M film of olefin resin containing specific hydrotalcites, it is inferior in abrasion resistance strength and durability, and it is difficult to use other fillers that have been known in the past. It is clear from the above explanation that a film formed by laminating other olefin resins on the inner and outer surfaces of an olefin resin containing There is no need to show this by example.

Patent Applicant Mitsubishi Kasei Vinyl Co., Ltd. Agent Patent Attorney Tsuyoshi Atsuya - (1 other person) Procedural Amendment June 22, 1988 Patent I [No. 120962 No. 120962 2 Name of Invention Agricultural Laminated Film 3] Relationship with the case of the person making the amendment Patent applicant name Mitsubishi Kasei Vinyl Co., Ltd. 4th agent 2-5-2-5 Marunouchi, Chiyoda-ku, Tokyo 100 Date of amendment order Voluntary action 6 Increased loss of invention due to amendment 07 Amendment Subject: Correct the "Claims J" and "Detailed Description of the Invention" columns in the specification.

2. [No'-・C104 on page 12, line 18 of the specification]
-4 should be corrected to rNO, -1C[0, -J.

3. Correct the word "karrum" at the beginning of lines 1.2, 3, 4.5 and 6 of the 14th younger brother of specification S to "potassium" respectively.

4. “Oleic resin” in the 17th line of the specification, lines 3-4
Correct the statement to "olefin resin."

5. “80e Zengping” in the 14th line of the 27th line of the Book of Ming aii
Correct it to "j80cm cubic".

6. Implementation in the specification page 31 #A1 table? 48 "Fila type jl [J column rMgo, iaA No. 11.3 (CH) z (COtL,
+sO, 55H701 is rMgo, ggAl. , 5a(OH)2(S iO,l
). , + y O, 52H, OJ.

Attachment Claims (1) 1 to 100 parts by weight of olefin resin
25 parts by weight of the following general formula % formula % where M represents an alkaline earth metal and Zn,
It represents an n-valent anion, and 1 and vm satisfy the conditions of the following formula.

Range B with a refractive index of 1.47 or more and 1.52 or less expressed by O<, <O, SO≦-≦2
1. A laminated film for agricultural use, characterized in that a layer of at least one resin selected from the group of olefinic PA resins is provided on the inner and outer surfaces of the film made of a composition containing a hydrotalcite compound.

(2) Olefin resin has a density of 0.910 g/am'
The laminated agricultural film according to claim 1, which is a low-density polyethylene or an ethylene-α-olefin copolymer having a density of 0.935 H/cm or less.

(3) The agricultural laminated film according to claim 1, wherein the olefin resin is an ethylene-vinyl acetate copolymer having a vinyl acetate content of 30 ply or less.

(4) The agricultural laminated film according to claim 1, wherein the hydrotalcite compound has an average secondary particle size of 5 μm or less and a BET specific surface area of 30 m″7 g or less.

(5) The density of the olefin resin used for the inner and outer layers is 0.
．． The agricultural use according to claim 1, which is a polyethylene or ethylene-α olefin copolymer having a melt index of 915 g/cta' to 0, 935 cm' or less, and a melt index of 0.1 g/10 min to 4 g/710 min. Laminated film.

(6) Olefin used in the inner and outer layers [fat has a melt index of 0.1 g/10 minutes to 414 g/10 minutes,
Claim 1, which is an ethylene-vinyl acetate copolymer having a vinyl acetate content of 15 parts by weight or less! Agricultural laminated film according to item IIrjS1.

(7) The olefin resin used for the inner and outer layers is ethylene-
Ionomer resin with zinc ion or sodium ion crosslinked structure of methacrylic acid copolymer, has a density of 0.935 g/cm' or more and 0.975 g/e or less, and a melt index of 0.5.710 minutes or more?
, /10 minutes or less, the agricultural laminated film according to claim 1.

(8) The olefin resin used for the inner and outer layers contains acrylic acid! The laminated agricultural film according to claim 1, which is an ethylene-acrylic acid copolymer containing 30% by weight or more.

Claims (8)

[Claims] (1) 1 to 2 parts per 100 parts by weight of olefin resin
5 parts by weight of the following general formula M_(_1_-_x_)・Al_x・(OH)_2・X
_x/n·mH_2O In the formula, M represents an alkaline earth metal and Zn, and X represents an n-valent anion. Moreover, x and m satisfy the conditions of the following formula. An olefin resin is applied to the inner and outer surfaces of a film made of a composition containing a hydrotalcite compound having a refractive index expressed by 0<x<0.5 0≦m≦2 in the range of 1.47 to 1.52. An agricultural laminated film characterized by being provided with at least one kind of resin layer selected from the group of. (2) Olefin resin has a density of 0.910g/cm^3
The laminated agricultural film according to claim 1, which is a low-density polyethylene or ethylene-α-olefin copolymer having a density of 0.935 g/cm^3 or less. (3) The agricultural laminated film according to claim 1, wherein the olefin resin is an ethylene-vinyl acetate copolymer having a vinyl acetate content of 30% by weight or less. (4) The agricultural laminated film according to claim 1, wherein the hydrotalcite compound has an average secondary particle size of 5 μm or less and a BET specific surface area of 30 m^2/g or less. (5) The density of the olefin resin used for the inner and outer layers is 0.
915g/cm^3 or more and 0.935g/cm^3 or less,
Dekatsu melt index is 0.1g/4g for 10 minutes or more
/10 minutes or less polyethylene or ethylene-α
The laminated agricultural film according to claim 1, which is an olefin copolymer. (6) A patent claim in which the olefin resin used for the inner and outer layers is an ethylene-vinyl acetate copolymer with a melt index of 0.1 g/10 min or more and 4 g/10 min or less and a vinyl acetate content of 15% by weight or less. Agricultural laminated film according to scope 1. (7) The olefin resin used for the inner and outer layers is ethylene-
It is an ionomer resin having a zinc ion or sodium ion crosslinked structure of methacrylic acid copolymer, and its density is 0.935 g/cm^3 or more and 0.975 g/cm
The agricultural laminated film according to claim 1, which has a melt index of ^3 or less and a melt index of 0.5 g/10 minutes or more and 7 g/10 minutes or less. (8) The agricultural laminated film according to claim 1, wherein the olefin resin used for the inner and outer layers is an ethylene-acrylic acid copolymer having an acrylic acid content of 30% by weight.