JPH06279606A - Agricultural vinyl chloride resin film - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a vinyl chloride resin film for agricultural use in which deterioration phenomena such as deterioration of physical properties and dust resistance are improved. [Structure] On one or both sides of a vinyl chloride resin film containing an organic phosphate ester or a metal salt of an organic phosphate, a film derived from a film composition containing a special acrylic resin and a crosslinkable compound as main components is formed. Formed vinyl chloride resin film for agriculture.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a vinyl chloride resin film for agriculture. More specifically, the present invention relates to an agricultural vinyl chloride resin film having improved durability against unfavorable deterioration phenomena such as discoloration, embrittlement, and deterioration of dustproof property caused by spreading outdoors.

[0002]

2. Description of the Related Art A vinyl chloride resin film that has been used as a covering material for agriculture has been deteriorated in appearance due to the influence of sunlight, especially ultraviolet rays, etc., one year after the start of use. Change over time, such as a decrease in flexibility. Further, recent improved agricultural techniques, particularly those aimed at economical efficiency and labor saving, have come to require coating materials to have the property of withstanding the harsh conditions that have been encountered in the past.

Therefore, for the purpose of improving weather resistance, a technique of adding a vinyl chloride resin as a base material with an organic phosphoric acid ester or a metal salt of an organic phosphoric acid to form a film, has been widely adopted. On the other hand, according to the conventional experience, the soft vinyl chloride resin film used for agriculture has a degree of difference depending on the area, place, etc. in which it is spread, but two years after the start of use, The dustproof property of the surface located outside the house or the tunnel is significantly reduced, and it cannot be used.

As a method of eliminating the above-mentioned drawbacks, Japanese Patent Publication No.
7-28740, JP-B-50-31195, JP-A-56-99237, JP-A-56-99.
As described in Japanese Patent No. 665 or the like, there is a method of forming a film of a specific acrylic resin on one side or both sides of a vinyl chloride resin film of a substrate. Furthermore, JP-A-5
Japanese Patent Laid-Open No. 1-70282 describes a method of forming a film of an acrylic resin having a specific composition containing an ultraviolet absorber on the film surface of a substrate. However, the acrylic resin of the composition using these methods, especially when the outside temperature in summer is high, the additive compounded in the base film migrates to the surface through the coating film and is washed away and disappears. It is difficult to completely suppress it, and there is still a problem in spreading and using the film outdoors for a long time.

Further, Japanese Patent Laid-Open No. 61-215630 and Japanese Patent Publication No. 63-9987 focus on the molecular weight and molecular weight distribution of the acrylic resin, but when extended for a long time, various methods are used. The performance was deteriorated and the crack resistance was inferior.

[0006]

DISCLOSURE OF THE INVENTION The present invention has significantly improved undesired deterioration phenomena such as discoloration, embrittlement, and deterioration of dustproof property caused by outdoor expansion, and has improved durability and is used for agricultural vinyl chloride. The purpose is to provide a resin film.

[0007]

SUMMARY OF THE INVENTION Therefore, the gist of the present invention is to provide (A) acrylic resin on one or both sides of a vinyl chloride resin film containing an organic phosphate ester or an organic phosphate metal salt. Derived from a coating composition mainly composed of an acrylic resin obtained by copolymerizing a mixture of a base monomer and an acrylic monomer containing a phosphoric acid ester group and (B) a crosslinkable compound It exists in an agricultural vinyl chloride resin film formed with a coating.

The present invention will be described in detail below. In the present invention, the vinyl chloride resin, in addition to polyvinyl chloride,
A copolymer in which vinyl chloride is the main component. Examples of the monomer compound copolymerizable with vinyl chloride include vinylidene chloride, ethylene, propylene, acrylonitrile, maleic acid, itaconic acid, acrylic acid, methacrylic acid, vinyl acetate and the like. These vinyl chloride resins may be produced by any of conventionally known production methods such as emulsion polymerization method, suspension polymerization method, solution polymerization method and bulk polymerization method.

In order to give flexibility to the vinyl chloride resin as the base, 20 to 60 parts by weight of a plasticizer is added to 100 parts by weight of the resin. By setting the compounding amount of the plasticizer within the above range, excellent flexibility and mechanical properties can be imparted to the desired soft vinyl chloride molded article. Examples of the plasticizer include di-n-octyl phthalate, di-2-ethylhexyl phthalate, dibenzyl phthalate, diisodecyl phthalate,
Phthalic acid derivatives such as didodecyl phthalate and diundecyl phthalate; Isophthalic acid derivatives such as dioctyl phthalate; Adipic acid derivatives such as di-n-butyl adipate and dioctyl adipate; Maleic acid derivatives such as di-n-butyl maleate; Tri-n -Citric acid derivatives such as butyl citrate; Itaconic acid derivatives such as monobutyl itaconate; Oleic acid derivatives such as butyl oleate; Ricinoleic acid derivatives such as glycerin monoricinoleate; Epoxidized soybean oil and epoxy resin plasticizers Agents and the like.

In the agricultural vinyl chloride resin film of the present invention, an organic phosphoric acid ester or an organic phosphoric acid metal salt is blended with the above vinyl chloride resin. Examples of the organic phosphate ester include triisopropyl phenyl phosphate, isodecyl diphenyl phosphate, tricresyl phosphate, tris (isopropylphenyl) phosphate, tributyl phosphate, triethyl phosphate, trioctyl phosphate, tributoxyethyl phosphate, triphenyl phosphate, octyl diphenyl. Among them, there are phosphates, trixylenyl phosphates, etc. Among them, tricresyl phosphate and trixylenyl phosphate are particularly preferable.

The above-mentioned organic phosphates can be used alone or in the form of a composite. Specific examples thereof include a complex of an organic phosphoric acid ester and an organic phosphorous acid ester, and the organic phosphorous acid ester also includes a phosphonate compound such as diphenylphosphonate. Examples of the organic phosphate metal salt include those represented by the general formula [I] or [II].

[0012]

[Chemical 1]

(In the formula, M means zinc, calcium, barium, magnesium, cobalt or strontium. Further, R ¹ , R ² and R ³ are each alkyl,
It means an aryl group, an arylalkyl group, an alkylaryl group, or an alkyl group having an ether bond. )

Examples of the alkyl group represented by R ¹ , R ² and R ³ include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, amyl, neopentyl, isoamyl, hexyl and isohexyl. , Heptyl, octyl, isooctyl, 2-
Examples thereof include ethylhexyl, decyl, isodecyl, lauryl, tridecyl, C _{12 to} C ₁₃ mixed alkyl, stearyl, cyclopentyl, cyclohexyl, cyclooctyl, cyclododecyl and 4-methylcyclohexyl groups.

Examples of aryl groups include phenyl and naphthyl groups. Examples of the arylalkyl group include benzyl, β-phenylethyl, α-phenylpropyl and β-phenylpropyl groups. Examples of alkylaryl groups include tolyl,
Xylyl, ethylphenyl, butylphenyl, tertiary butylphenyl, octylphenyl, isooctylphenyl, tertiary octylphenyl, nonylphenyl, 2,4-
A di-tertiary butylphenyl group etc. are mentioned.

Examples of the alkyl group having an ether bond include furfuryl, tetrahydrofurfuryl, 5-methylfurfuryl and α-methylfurfuryl groups, or methyl-, ethyl-, isopropyl-, butyl-, isobutyl-, hexyl-. , Cyclohexyl-, phenylcellosolve residues; methyl-, ethyl-, isopropyl-, butyl-, isobutylcarbitol residues; triethylene glycol monomethyl ether, -monoethyl ether, -monobutyl ether residues; glycerin 1,2- Dimethyl ether, -monoethyl ether, -monobutyl ether residue; glycerin 1,2-dimethyl ether, -1,3
-Diethyl ether, -1-ethyl-2-propyl ether residue; nonylphenoxypolyethoxyethyl, lauroxypolyethoxyethyl residue and the like.

The metal represented by M is particularly preferably zinc, calcium or barium. These organic phosphoric acid esters or organic phosphoric acid metal salts may be blended individually or in combination of two or more. In the agricultural film of the present invention, it is preferable to use an organic phosphoric acid ester and an organic phosphoric acid metal salt in combination from the viewpoint of film forming property and outdoor spreading property.

The amount of the organic phosphate ester or the organic phosphate metal salt to be compounded is within the range of 0.1 to 15 parts by weight, preferably 0.2 to 1 with respect to 100 parts by weight of the vinyl chloride resin.
It is selected within the range of 0 parts by weight. If the amount is less than 0.1 parts by weight, the weather resistance and dust resistance of the vinyl chloride resin film will not be improved. If the blending amount is more than 15 parts by weight, the transparency of the film becomes extremely poor, which is not preferable. Within the above range, the range of 0.2 to 8 parts by weight is particularly preferable.

In addition to the above-mentioned plasticizer, organic phosphoric acid ester or organic phosphoric acid metal salt, a known resin usually added to a synthetic resin for molding may be added to the vinyl chloride resin. For example, a lubricant, a heat stabilizer, an ultraviolet absorber, a light stabilizer, an antioxidant, a stabilizing aid, an antistatic agent, an antifogging agent, an antifungal agent, an antialgal agent, an inorganic filler, a coloring agent, etc. It can be blended.

A lubricant that can be incorporated into the film according to the present invention,
Examples of heat stabilizers or antioxidants include polyethylene wax, bisamide compounds, liquid paraffin, organic phosphite compounds, β-diketone compounds, and the like. The above various resin additives can be used alone or in combination of several kinds.

The addition amount of the above various resin additives can be selected within a range not deteriorating the properties of the film, usually within a range of 10 parts by weight or less with respect to 100 parts by weight of the vinyl chloride resin of the substrate. To blend the vinyl chloride resin, which is the base of the film, with the plasticizer, the organic phosphate ester or the organic phosphate metal salt, and other resin additives, each is weighed in a necessary amount, a ribbon blender, a Banbury mixer, A super mixer or other conventionally known compounding machine or mixing machine may be used.

The resin composition thus obtained can be formed into a film by a method known per se, for example, a melt extrusion molding method (including a T-die method and an inflation method), a calender molding method, a solution casting method. According to the law etc. The coating composition of the present invention comprises (A) an acrylic resin obtained by copolymerizing a mixture of an acrylic monomer and a phosphoric ester group-containing acrylic monomer, and (B) a crosslinkable compound. Is the main component.

The acrylic monomer used in the present invention is
An alkyl ester of acrylic acid or methacrylic acid. Examples of alkyl esters of acrylic acid or methacrylic acid include methyl acrylate, ethyl acrylate, n-propyl acrylate, iso-propyl acrylate, n-butyl acrylate, iso-butyl acrylate, cyclohexyl acrylate, 2-ethylhexyl acrylate, decyl acrylate, dodecyl. acrylate, tridecyl acrylate, C ₁ -C ₂₂ alkyl esters of acrylic acid such as stearyl acrylate: methyl methacrylate, ethyl methacrylate, n- propyl methacrylate, iso- propyl methacrylate, n- butyl methacrylate, IS
Examples thereof include C ₁ -C ₂₂ alkyl esters of methacrylic acid such as o-butyl methacrylate, cyclohexyl methacrylate, 2-ethylhexyl methacrylate, decyl methacrylate, dodecyl methacrylate, tridecyl methacrylate and stearyl methacrylate. You may use these monomers in combination of several types.

The acrylic monomer having a phosphoric acid ester group used in the present invention means a compound in which the ester portion of an alkyl ester of acrylic acid or methacrylic acid is replaced with a phosphoric acid ester. The phosphoric acid ester includes a trialkyl ester, a dialkyl ester, and a monoalkyl ester, and depending on the type, 1-substituted, 2-substituted, 3-substituted.

Specifically, for example, mono (2-hydroxyethyl acrylate) acid phosphate, mono (2-
Hydroxyethyl methacrylate) acid phosphate, mono (2-hydroxypropyl acrylate) acid phosphate, mono (2-hydroxypropyl methacrylate) acid phosphate, mono (3-hydroxypropyl acrylate) acid phosphate, mono (3
-Hydroxypropyl methacrylate) acid phosphate, mono (3-chloro-2-hydroxypropyl methacrylate) acid phosphate, acid phosphooxypolyoxyethylene glycol monomethacrylate, di (2,3-dihydroxypropyl acrylate) acid phosphate, di (2,2 3-dihydroxypropyl methacrylate) acid phosphate and the like can be mentioned.

When the acrylic monomer and the acrylic monomer containing a phosphoric acid ester group are copolymerized, the compounding ratio is 99.9 to 70 of the former and 0.1 to 30 of the latter in terms of weight ratio.
The ratio of (the total amount of both is 100) is particularly 99.
A ratio of 5-80 to 0.5-20 is preferred. If the proportion of the latter is higher than this range, the adhesion between the vinyl chloride resin film and the formed coating becomes poor, which is not preferable.
On the contrary, if the compounding ratio of the latter is less than this, the dustproof property and weather resistance of the formed film cannot be sufficiently improved, which is not preferable.

In addition to the monomer of the acrylic monomer, other monomer copolymerizable with the monomer may be added. Examples of the other monomer include α, β-ethylenically unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, crotonic acid and itaconic acid; α such as ethylenesulfonic acid. , Β-ethylenically unsaturated sulfonic acids; 2-acrylamido-2-methylpropanoic acid; α, β-ethylenically unsaturated phosphonic acids; hydroxyl-containing vinyl monomers such as hydroxyethyl of acrylic acid or methacrylic acid; acrylonitriles Acrylic amides; glycidyl esters of acrylic acid or methacrylic acid, and the like. These monomers may be used alone or in combination of two or more.

A mixture of an acrylic monomer and an acrylic monomer containing a phosphoric acid ester group and another monomer copolymerizable with the other monomer are charged into a polymerization vessel together with an organic solvent or water, A polymerization initiator and, if necessary, a molecular weight modifier are added, and the mixture is heated and polymerized with stirring to obtain an acrylic resin. For the polymerization, generally known methods such as a suspension polymerization method, a solution polymerization method and a soap-free polymerization method are adopted.

The organic solvent used for the polymerization is methanol, ethanol, n-propanol, isopropanol, n-butanol, sec-butanol, tert-.
Alcohols such as butanol, n-amyl alcohol, isoamyl alcohol, tert-amyl alcohol, n-hexyl alcohol and cyclohexanol; aromatic hydrocarbons such as benzene, toluene and xylene; acetic acid esters such as ethyl acetate and butyl acetate Acetone, methyl ethyl ketone, methyl-n-propyl ketone, methyl isobutyl ketone, diethyl ketone, 2-hexanone,
There are ketones such as 3-hexanone, di-n-propyl ketone, diisopropyl ketone, di-n-amyl ketone, and cyclohexanone; tetrahydrofuran and the like, and these can be used alone or in combination of two or more.
Polymerization initiators that can be used include radical-generating catalysts such as α, α-azobisisobutyronitrile, benzoyl peroxide, cumene hydroperoxide, and butyl mercaptan, n-dodecyl mercaptan as a molecular weight regulator. Examples thereof include tert-dodecyl mercaptan and β-mercaptoethanol.

In addition to these components, auxiliary components such as an antioxidant, a neutralizing agent, a UV absorber, a light stabilizer, an antistatic agent, a pigment, a dye and an antifungal agent are included in the acrylic resin. Agents, anti-algae agents, foaming agents, lubricants, etc. can be added,
It can be used after being dispersed and / or dissolved in water or an organic solvent. Examples of the organic solvent include heptane and cyclohexane as an aliphatic hydrocarbon; benzene, toluene, xylene and the like as an aromatic hydrocarbon; methanol, ethanol, isopropyl alcohol, and the like as alcohols.
Polyoxyethylene glycol, etc .; Chloroform, tetrachlorohydrocarbon, chlorobenzene, etc. as halogenated hydrocarbons; Acetone, methyl ethyl ketone, methyl isobutyl ketone, etc. as ketones; Methyl acetate, allyl acetate, ethyl stearate, etc. as esters; Amines Examples include trimethylamine, diphenylamine, hexamethylenediamine, etc .; other dimethylformamide, dimethylacetamide, dioxane, diethyl ether, diethylenedithioglycol, diacetone alcohol, benzonitrile, dimethylsulfoxide, etc. These may be used alone or in combination of two or more. Can be used.

The crosslinkable compound used in the present invention is a compound capable of crosslinking reaction of an acrylic resin obtained by copolymerizing a mixture of an acrylic monomer and an acrylic monomer containing a phosphoric acid ester group. I wish I had it. Specifically, for example, isocyanate-based, carboxyl-based, epoxy-based,
Examples thereof include compounds such as alkyl ether type, amine type, aziridine type, phenol resin, melamine resin and amino acid.

A coating composition is obtained by blending an acrylic resin (A) obtained by copolymerizing a mixture of acrylic monomers with a crosslinkable compound (B). The weight ratio of the acrylic resin and the crosslinkable compound is 100 for the former and the latter.
A ratio of 0.1 to 100 to 50 is preferable, and a ratio of 100 to 1 to 100: 20 is particularly preferable.

If the mixing ratio of the crosslinkable compound is too high, the coating film formed on the film becomes brittle and peels off easily, which is not preferable. Further, if the mixing ratio of the crosslinkable compound is too small, a sufficient dustproof effect cannot be exhibited, which is not preferable. A liquid dispersion medium is added to the composition for coating as needed. As the liquid dispersion medium,
Monohydric alcohols such as methyl alcohol, ethyl alcohol and isopropyl alcohol; ethylene glycol,
Polyhydric alcohols such as diethylene glycol and glycerin; Cyclic alcohols such as dibenzyl alcohol;
Cellosolve acetates; ketones and the like.
These liquid dispersion media may be used alone or in combination, but are determined in consideration of the dispersion stability of the coating composition, the wettability after coating on the film surface, the difficulty of removing the liquid dispersion medium, and the economical efficiency. Is preferred.

In the above composition, a small amount of an acid or alkali defoaming agent, a surfactant, a lubricant, an antistatic agent, a plasticizer, an antioxidant, an ultraviolet absorber, a light stabilizer, a film forming aid,
Conventional additives such as thickeners, fungicides, algae inhibitors, pigments, pigment dispersants and inorganic fillers may be mixed. Methods of forming a coating film on the surface of a base film include a method of forming a coating composition in a solution state and a method of forming a coating composition in a molten state without being in a solution state.

To form a film in a solution state, for example,
Doctor blade coating method, gravure roll coating method,
After applying the coating composition on the surface of the base film by a method known per se such as an air knife coating method, a reverse roll coating method, a dip coating method, a brush coating method, a spray coating method, a bar coating method, a knife coating method, a heat treatment. Should be done. Examples of the heat treatment method include a hot air heating method, an infrared heating method, a far infrared heating method, and the like, and the hot air heating method is advantageous in consideration of heat treatment efficiency and safety.

On the other hand, in order to form a film in a molten state without being in a solution state, the coating composition is heated and melted, and this and the base film are subjected to, for example, a coextrusion method, an extrusion coating method,
A lamination method such as an extrusion laminating method or a laminating method may be adopted. The heating temperature at the time of heat treatment and heat melting after the above-mentioned application is in the range of 50 to 200 ° C
The time is preferably selected from 10 seconds to 60 minutes.

By heating, the acrylic resin and the crosslinkable compound are chemically bonded, and the coating film is strong and has excellent barrier properties against weathering deterioration factor substances and contaminants.
Improves weather resistance and dust resistance. The gel fraction (weight ratio of the insoluble matter that is insoluble in the organic solvent) of the coating film thus formed is preferably 10 to 80%. Further, the coating amount is preferably in the range of 0.1 to 10 g / m ² . If it is less than 0.1 g / m ^2, the effect of preventing the surface migration of the plasticizer in the vinyl chloride resin film is insufficient. On the other hand, when it is 10 g / m ² or more, the coating amount becomes too large, which is economically disadvantageous and the mechanical strength of the film itself may be lowered. Therefore, usually
Range of 0.5g / m ² ~7g / m ² is most preferred.

Before coating the coating composition, the surface of the vinyl chloride resin film is washed with alcohol or water in advance, plasma discharge treatment or corona discharge treatment is carried out, and another paint or primer is applied as an undercoat. It is also possible to carry out pretreatment such as performing. In actually using the agricultural vinyl chloride resin film according to the present invention as an agricultural coating material, when the coating is formed on only one side, the side provided with this coating is placed outside the house or tunnel. To be used.

[0039]

EFFECT OF THE INVENTION The agricultural vinyl chloride resin film of the present invention comprises a base film, a specific acrylic resin formed on the surface of the base film, and a coating derived from a coating composition containing a crosslinkable compound as a main component. It is suitable for use as an agricultural film to be spread and used outdoors because of its excellent properties, the film is difficult to peel off, and its physical properties and dustproof property are not deteriorated for a long time.

[0040]

EXAMPLES The present invention will now be described in detail based on examples, but the present invention is not limited to the following examples as long as the gist thereof is not exceeded. Examples 1-5, Comparative Examples 1-4

I. Preparation of base film 100 parts by weight of polyvinyl chloride (average degree of polymerization 1400),
50 parts by weight dioctyl phthalate, epoxidized soybean oil 3
Parts by weight, barium-zinc composite liquid stabilizer 1.5 parts by weight, barium stearate 0.2 parts by weight, zinc stearate 0.4 parts by weight, sorbitan laurate 1.5 parts by weight, 2,4-dihydroxybenzophenone A resin composition consisting of 0.5 parts by weight was prepared, and the type and amount of the organic phosphate ester or the organic phosphate metal salt shown in Table 2 was blended. Each mixture was stirred and mixed with a super mixer for 10 minutes, and then kneaded on a mill roll heated to 180 ° C,
A substrate film having a thickness of 0.15 mm was prepared.

II. Preparation of coating resin To the reactor equipped with a thermometer, stirrer, reflux condenser and charging nozzle, the acrylic monomer and the phosphoric ester group-containing acrylic monomer were added in the types and amounts shown in Table-1. , 1 part by weight of benzoyl peroxide and 150 parts by weight of isopropyl alcohol were added, and while stirring in a nitrogen gas stream,
The reaction was continued at 80 ° C. for 3 hours, 0.5 parts by weight of benzoyl peroxide was further added, and the reaction was continued for about 3 hours at the same temperature to obtain acrylic resins a to f. The obtained acrylic resin and the crosslinkable compound were blended in the amounts shown in Table 2, and isopropyl alcohol was added thereto so that the solid content was 20% by weight to obtain a coating composition.

III. Formation of Coating The coating composition prepared in II was applied to one side of the substrate film prepared by the method described in I using a # 5 bar coater. The coated film was kept in an oven at 130 ° C. for 1 minute to volatilize the solvent. The coating amount of each film obtained was about 3 g / m ² .

IV. Evaluation of film Each performance of 9 kinds of films was evaluated by the following method,
The results are shown in Table-3. (I) Initial appearance The appearance of the film was visually observed. The evaluation criteria are as follows. ◎ ・ ・ Colorless and highly transparent. ○ ・ ・ It is slightly white but has transparency. △ ・ ・ It is white and translucent. × ・ ・ It is cloudy and devitrified.

(Ii) Flexibility of coating film Each film was cut into a piece having a width of 5 cm and a length of 15 cm and folded back in a direction perpendicular to the length direction at intervals of 2 cm. In this state, a load of 2 kg was applied from above and the sample was left in a constant temperature bath maintained at 15 ° C. for 24 hours. Then, the load was applied, the folds of the film were extended, and the appearance of the film was visually observed. ◎ ・ ・ No change is observed in the film at the fold line. Δ ・ Cracks are observed in the coating film at the fold line. × ・ ・ The film on the folds has significant cracks.

(Iii) Outdoor spreading test Each film was applied to a roof-type house (frontage: 3 m, depth: 5 m, ridge height: 1.5 m, roof slope: 30 degrees) installed in a test field in Isshi-gun, Mie prefecture, and a film was provided on the surface. Was covered on the outside of the house, and a spreading test was conducted for two years from November 1990 to November 1992. With respect to the stretched film, the appearance test of the film and the elongation retention of the film were measured by the following methods, and the dust resistance of the film under the stretch test was evaluated.

Appearance of film: The appearance is visually observed. The evaluation criteria are as follows. ◎ ・ ・ No change in appearance such as discoloration. ○ ・ ・ Some appearance changes such as slight discoloration are recognized. △ ・ ・ The appearance change such as discoloration is considerably recognized. × ・ ・ Discoloration is observed on the entire surface.

Elongation retention rate of film: means a value calculated by the following equation. (Elongation of film after expansion) ÷ (Elongation of film before expansion) × 100 (%) Dust resistance: Evaluated from the value calculated by the following formula. (Light transmittance of film collected over time after spreading) ÷
(Light transmittance of the film before spreading *) x 100 (%) * Direct light transmittance at a wavelength of 555 mμ (Hitachi, EPS-2U type used)

The display of the measurement result is as follows. ◎ ・ The light transmittance after spreading is 90% or more before spreading. ○ ・ ・ The light transmittance after spreading is in the range of 70 to 89% before spreading. B: The light transmittance after spreading is in the range of 50 to 69% before spreading. × ・ ・ The light transmittance after spreading is less than 50% before spreading.

[0050]

[Table 1]

[0051]

[Table 2]

[0052]

[Table 3]

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akiko Sanada 2 Oike, Iwazuka-cho, Nakamura-ku, Nagoya-shi, Aichi Mitsubishi Kasei Vinyl Co., Ltd. Nagoya factory

Claims (1)

[Claims] 1. A (A) acrylic monomer and an acrylic monomer containing a phosphoric acid ester group on one or both sides of a vinyl chloride resin film containing an organic phosphoric acid ester or an organic phosphoric acid metal salt. A vinyl chloride resin film for agricultural use, wherein a film derived from a film composition mainly composed of an acrylic resin obtained by copolymerizing a mixture thereof with (B) a crosslinkable compound is formed.