JPH0567653B2 - - Google Patents

Description

[Detailed description of the invention]

"Field of Industrial Application" The present invention relates to a vinyl chloride resin film for agricultural use. More specifically, the present invention relates to an agricultural vinyl chloride resin film that prevents a decrease in transparency caused by the growth of algae when spread outdoors. ``Conventional technology'' In recent years, farmers cultivating useful plants have been growing them in greenhouses (greenhouses), in order to improve profitability.
Alternatively, methods of promoting or suppressing cultivation in tunnels have become widely adopted. Polyethylene films, ethylene-vinyl acetate copolymer films, polyester films, polycarbonate films, hard and soft vinyl chloride resin films, glass, and the like are used as covering materials for greenhouses or tunnels. Among them, soft vinyl chloride resin film is widely used because it has the best overall light transmittance, heat retention, mechanical strength, durability, and workability compared to other synthetic resin films. . Along with this, the environments in which they are used have become more diverse, and the environmental conditions inside and outside the greenhouse have become relatively hot and humid, resulting in algae growing on the outside or inside of the greenhouse, which is made of soft vinyl chloride resin film. In addition to blocking the transmission of sunlight, there are also many cases where the mechanical strength of the film is reduced. Generally, algae are microorganisms that exist in surface water.
Because it contains chlorophyll, it has photosynthetic ability, and its surface is often covered with a sticky substance, so it can be used to physically and mechanically prevent the growth of algae on the film, and to remove any that have formed. is difficult. Traditionally, the only way to remove algae from a film that has grown algae is to physically scrape it off or let it dry and wait for it to fall off naturally.
Either method is difficult to work with in large facility greenhouses, etc. If you try to kill algae with chemicals, for example, using a sodium subzincate aqueous solution, it is possible to kill the algae, but it is possible to kill the dead algae with a film. It is necessary to remove the algae from above, and the algaecide effect cannot be expected to last for a long time. "Problem to be Solved by the Invention" Under such circumstances, the present inventors have sought to prevent the decrease in transparency caused by the growth of algae caused by spreading outdoors, and to improve the sustainability of the effect. As a result of intensive studies aimed at providing an excellent agricultural vinyl chloride resin film, the present invention has been completed. "Means for Solving the Problems" The gist of the present invention is to apply acrylic acid or methacrylic acid to one or both sides of a vinyl chloride resin film containing an organic phosphate ester or an organic phosphate metal salt. Acrylic resin [A] obtained by polymerizing a mixture containing 60 parts by weight or more of alkyl esters, 60 to 95 parts by weight of alkyl esters of acrylic acid or methacrylic acid, and perfluoroalkyl esters of acrylic acid or methacrylic acid. Agricultural vinyl chloride-based film formed with an organic nitrogen algaecide-containing film containing two main components: fluorine-containing acrylic resin [B] obtained by polymerizing a mixture consisting of 40 to 5 parts by weight of Exists in resin film. The present invention will be explained in detail below. 1. Vinyl chloride resin In the present invention, the vinyl chloride resin refers to polyvinyl chloride as well as a copolymer whose main component is vinyl chloride. Examples of monomer compounds copolymerizable with vinyl chloride include vinylidene chloride, ethylene, propylene, acrylolnitrile, maleic acid, itaconic acid, acrylic acid, methacrylic acid, and vinyl acetate. These vinyl chloride resins may be produced by any of conventionally known production methods such as emulsion polymerization, suspension polymerization, solution polymerization, and bulk polymerization. In order to impart flexibility to the vinyl chloride resin that serves as the base, 100 parts by weight of this resin is added.
20 to 60 parts by weight of plasticizer are incorporated. By controlling the blending amount of the plasticizer within the above range, it is possible to impart excellent flexibility and mechanical properties to the desired soft vinyl chloride molded product. Examples of the plasticizer include di-n-octyl phthalate, di-2-ethylhexyl phthalate,
Phthalic acid derivatives such as dibenzyl phthalate, diisodecyl phthalate, didodecyl phthalate, diundecyl phthalate; Isophthalic acid derivatives such as dioctyl phthalate; Adipic acid derivatives such as di-n-butyl adipate, dioctyl adipate; di-n-butyl maleate, etc. maleic acid derivatives; citric acid derivatives such as tri-n-butyl citrate; itaconic acid derivatives such as monobutyl itaconate; oleic acid derivatives such as butyl oleate;
Other examples include ricinoleic acid derivatives such as glycerin monoricinolate; other examples include epoxidized soybean oil and epoxy resin plasticizers. In the agricultural vinyl chloride resin film of the present invention, an organic phosphate ester or an organic phosphate metal salt is blended with the above-mentioned vinyl chloride resin. Examples of organic phosphoric acid esters include triisopropylphenyl phosphate, isodecyl diphenyl phosphate, tricresyl phosphate, tris(isopropylphenyl) phosphate, tributyl phosphate, triethyl phosphate,
Examples include trioctyl phosphate, tributochiteethyl phosphate, triphenyl phosphate, octyl diphenyl phosphate, and tricylenyl phosphate, among which tricresyl phosphate and tricylenyl phosphate are particularly preferred. The above organic phosphate esters can be used alone or as a composite. For example, a composite of an organic phosphoric acid ester and an organic phosphorous acid ester may be mentioned, and the organic phosphorous acid ester also includes a phosphonate-based compound such as diphenylphosphonate. Examples of the organic phosphate metal salt include those represented by the general formula [] or [].

[ka]

[C] (where M is zinc, calcium, barium,
Means magnesium, cobalt or strontium. Moreover, R ¹ , R ² and R ³ each mean an alkyl, aryl, arylalkyl, alkylaryl, or an alkyl group having an ether bond. ) The metal represented by M is particularly preferably zinc, calcium and barium. Examples of alkyl groups represented by R ¹ , R ² and R ³ include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, amyl, neopentyl, isoamyl, hexyl, isohexyl, heptyl, Examples include octyl, isooctyl, 2-ethylhexyl, dedyl, isodezyl, lauryl, tridecyl, _C12 - _C13 mixed alkyl, stearyl, cyclopentyl, cyclohexyl, cyclooctyl, cyclododecyl, 4-methylcyclohexyl, and the like. Examples of aryl groups include phenyl and naphthyl groups. Examples of arylalkyl groups include benzyl,
β-phenylethyl, α-phenylpropyl, β
-phenylpropyl group and the like. Examples of alkylaryl groups include tolyl, xylyl, ethyl phenyl, butylphenyl, tertiary
Examples include butylphenyl, octylphenyl, isooctylphenyl, tertiary octylphenyl, nonylphenyl, 2,4-di-tertiary butylphenyl, and the like. Examples of the alkyl group having an ether bond include furfuryl, tetrahydrofurfuryl, 5-methylfurfuryl, and α-methylfurfuryl, or
Methyl-, ethyl-, isopropyl-, butyl-, isobutyl-, hexyl-, cyclohexyl-, phenyl cellosolve residue; Methyl-, ethyl-, isopropyl-, butyl-, isobutyl carbitol residue; Triethylene glycol monomethyl ether , -monoethyl ether, -monobutyl ether residue; 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; examples include nonylphenoxypolyethoxyethyl and lauroxypolyethoxyethyl residues. These organic phosphate esters or organic phosphate metal salts can be used alone or in combination. In the agricultural film of the present invention, it is most preferable to use an organic phosphate ester and an organic phosphate metal salt in combination in terms of film formation properties and outdoor spreadability. The amount of organic phosphate ester or organic phosphate metal salt is 0.1 parts by weight per 100 parts by weight of vinyl chloride resin.
-15 parts by weight, preferably 0.2-10 parts by weight. If the amount is less than 0.1 part by weight, the weather resistance and dustproof properties of the soft vinyl chloride resin film will not improve. If the amount is more than 15 parts by weight, the transparency of the film will be extremely poor, which is not preferable. Within the above range, a range of 0.2 to 8 parts by weight is particularly preferred. In addition to the above-mentioned plasticizer, organic phosphate ester, or organic phosphate metal salt, the vinyl chloride resin may optionally contain known resin additives that are usually blended into synthetic resins for molding, such as , lubricant, heat stabilizer, ultraviolet absorber, light stabilizer, antioxidant,
Stabilizing aids, antistatic agents, antifogging agents, inorganic fillers, colorants, etc. can be blended. Examples of lubricants, heat stabilizers, and antioxidants that can be incorporated into the film of the present invention include polyethylene waxes, bisamide compounds, liquid paraffin, organic phosphorite compounds, and β-diketone compounds. The above various resin additives can be used alone or in combination. The amount of the various resin additives mentioned above can be selected within a range that does not deteriorate the properties of the film, usually within a range of 10 parts by weight or less based on 100 parts by weight of the base vinyl chloride resin. In order to blend the plasticizer, organic phosphate ester or organic phosphate metal salt, and other resin additives into the vinyl chloride resin that serves as the base of the film, the necessary amounts of each are weighed out, and then mixed with a ribbon blender, a Banbury mixer, A conventionally known blender or mixer such as a super mixer may be used. In order to form a film from the resin composition obtained in this way, a method known per se can be used, such as melt extrusion molding method (including T-die method and inflation method), calender molding method, solution casting method. etc. 2 Acrylic resin [A] 2-1 Acrylic monomer Examples of alkyl esters of acrylic acid or methacrylic acid include methyl acrylate, ethyl acrylate, n-propyl acrylate, and iso-
_C1 - _C22 alkyl esters of acrylic acid such as propyl acrylate, n-butyl acrylate, iso-butyl acrylate, cyclohexyl acrylate, 2-ethylhexyl acrylate, decyl acrylate, dodecyl acrylate, tridecyl acrylate, stearyl acrylate, etc.: Methyl methacrylate, ethyl methacrylate, n-propyl methacrylate,
iso-propyl methacrylate, n-butyl methacrylate, iso-butyl methacrylate, cyclohexyl methacrylate, 2-ethylhexyl methacrylate, decyl methacrylate, dodecyl methacrylate, tridecyl methacrylate,
Examples include C ₁ -C ₂₂ alkyl esters of methacrylic acid such as stearyl methacrylate. 2-2 Formulation The acrylic resin [A] contains the alkyl esters of acrylic acid or methacrylic acid described in 2-1.
Obtained by polymerizing a mixture containing 60 parts by weight or more. If the amount of the alkyl ester of acrylic acid or methacrylic acid is less than this amount, the water resistance of the formed film will not be sufficient. In addition, other monomers copolymerizable with the monomers can be blended into the monomer mixture. Examples of other monomers include α,β-ethylenically unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, crotonic acid, and itaconic acid; , β-ethylenically unsaturated sulfonic acids;
2-acrylamido-2-methylpropanoic acid;
Examples include α,β-ethylenically unsaturated phosphonic acids; hydroxyl group-containing vinyl monomers such as hydroxyethyl acrylic acid or methacrylic acid; acrylonitriles; acrylamides; glycidyl esters of acrylic acid or methacrylic acid. These monomers may be used alone or in combination of two or more. 3 Fluorine-containing acrylic resin [B] 3-1 Perfluoroalkyl group-containing acrylic monomer Specifically, perfluoroalkyl esters of acrylic acid or methacrylic acid include 2,
2,2-trifluoroethyl acrylate, 2,
2,2-trifluoroethyl methacrylate,
2,2,3,3-tetrafluoropropyl acrylate, 2,2,3,3-tetrafluoropropyl methacrylate, 2,2,3,3,3-pentafluoropropyl acrylate, 2,2,3,
3,3-pentafluoropropyl methacrylate, 1-trifluoromethyl-2,2,2-trifluoroethyl acrylate, 1-trifluoromethyl, 2,2,2-trifluoroethyl methacrylate-2,2,3,3 , 4,4,5,5-octafluoropentyl acrylate, 2,2,
3,3,4,4,5,5-octafluoropentyl methacrylate, 2,2,3,3,4,4-hexafluorobutyl acrylate, 2,2,3,
3,4,4-hexafluorobutyl methacrylate, 2-perfluorooctyl ethyl acrylate, 2-perfluorooctyl methacrylate,
2-perfluorononylethyl acrylate, 2
-perfluorononylethyl methacrylate, etc. Among these, those in which the number of fluorine atoms in the perfluoro group is 5 or more are particularly preferred. These may be used alone or in combination of two or more. 3-2 Blend The fluorine-containing acrylic resin [B] is a mixture containing 60 to 95 parts by weight of the alkyl ester of acrylic acid or methacrylic acid described in 2-1 and the acrylic acid or methacrylic acid described in 3-1. It is obtained by polymerizing a mixture containing 40 to 5 parts by weight of perfluoroalkyl esters. If the amount of the alkyl ester of acrylic acid or methacrylic acid is less than the above amount, the miscibility with the acrylic resin [A] will be poor, and the formed film will not have sufficient transparency, and if it is more than the above amount, the formed film will be The effect on dust resistance and weather resistance is not sufficient and is therefore undesirable. In addition, other monomers copolymerizable with the monomer described in 2-2 can be blended into the monomer-resistant mixture. 4 Production of resin [A] and resin [B] For the acrylic resin [A] and fluorine-containing acrylic resin [B], the mixture is charged into a polymerization can together with an organic solvent, and a polymerization initiator is added as necessary. A molecular weight regulator is added thereto, and the mixture is heated and polymerized with stirring. As the polymerization method, a known suspension polymerization method, solution polymerization method, or the like is employed. Organic solvents used for polymerization include methanol,
Ethanol, n-propanol, isopropanol, n-butanol, sec-phthanol, 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 esters such as ethyl acetate and butyl acetate Ketones such as acetone, methyl ethyl ketone, methyl-n-propyl ketone, methyl isobutyl ketone, diethyl ketone, 2-hexanone, 3-hexanone, di-n-propyl ketone, diisopropyl ketone, di-n-amyl ketone, cyclohexanone; tetrahydrofuran These can be used alone or in combination of two or more. Examples of polymerization initiators that can be used include radical-generating catalysts such as α,α-azobisisobutyronitrile, benzoyl peroxide, and cumene hydroperoxide, and examples of molecular weight regulators include butyl mercaptan, n-dodecyl mercaptan, tert-dodecyl mercaptan,
Examples include β-mercaptoethanol. 5 Organic nitrogen-based algaecides Examples of organic nitrogen-based algaecides include 2-(4
-thiazolyl)-benzimidazole, 2-methoxycarbonylamyl-benzimidazole and other imidazole derivatives; 3,4,5-tribromusalicylanilide and other derivatives; 3-trifluoromethyl-4,4'-dichloro-N, N'-dichlor-
Urea derivatives such as N,N'-biphenyl urea; N-
Ammonium derivatives such as ammonium methyldithiocarbamate and tetradecyldimethylbenzylammonium chloride; Pyridine derivatives such as 2,3,5,6-tetrachloro-4(methylsulfonyl)pyridine; 2-methylthio-4-t-butylamino Triazine derivatives such as -6-cyclopropyl-amino-S-triazine; N,N-dimethyl-N'-(fluorodichloromethylthio)-N'-
N-haloalkylthio derivatives such as phenylsulfamide; N-(fluorodichloromethylthio),
Phthalimide, N-phthalimide derivatives such as 1,1,2,2-tetrachloroethylthiotetrahydrophthalimide; nitrile derivatives such as 2,4,5,6-tetrachloroisoaphthalonitrile; 2-
Examples include benzothiazole derivatives such as (4-thiocyanomethylthio)benzothiazole; 4-substituted benzylamine derivatives such as 4-trimethylsilylbenzylamine; and dithiocarbamate derivatives such as tetramethylthiuram disulfide. These organic nitrogen-based algaecides may be used alone or in combination of two or more. Furthermore, if necessary, an algaecide other than organic nitrogen type, such as parachloromethaxylenol, may be used at the same time. 6 Coating 6-1 Preparation of coating composition The proportion of the acrylic resin [A] and the fluorine-containing acrylic resin [B] is the former in terms of solid content weight ratio.
40-99 vs. the latter 60-1 (the total amount of both is 100)
A good ratio of 50 to 98 to 50 to 98 is particularly preferable.
It is 2. If the blending ratio of the former is larger than this, it is not preferable because the dust-proofing properties and weather resistance of the formed film cannot be sufficiently improved. On the other hand, if the blending ratio of the former is less than this, the permeability of the formed film will not be sufficient and the cost will be high, which is not preferable because the effect obtained is not large compared to the increase in cost. The blending ratio of the composition consisting of the acrylic resin [A] and the fluorine-containing acrylic resin [B] and the organic nitrogen algaecide is 99.9 to 60 for the former and 0.1 to 40 for the latter (both in terms of solid content weight ratio). The ratio of 99.5 to 75 to 0.5 to 25 is particularly preferable.
It is. If the ratio of the latter is less than this, the agricultural vinyl chloride resin film will not exhibit algae-proofing properties. On the other hand, if the ratio of the latter is higher than this, there is a problem in that the transparency of the formed film decreases. In addition to these components, the coating composition may contain auxiliary components such as antioxidants, neutralizers, ultraviolet absorbers, light stabilizers, antistatic agents, pigments, dyes, blowing agents, and lubricants. It can be used after being dispersed and/or dissolved in an organic solvent or water. Examples of organic solvents include aliphatic hydrocarbons such as heptane and cyclohexane; aromatic hydrocarbons such as benzene, toluene, and xylene; alcohols such as methanol, ethanol, isopropyl alcohol, and polyoxyethylene glycol; and halogenated hydrocarbons such as chloroform. , tetrachlorinated hydrocarbons, chlorobenzene, etc.; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone; esters such as methyl acetate, allyl acetate, ethyl stearate;
Amines include trimethylamine, diphenylamine, hexamethylene diamine, etc.; others include dimethylformamide, dimethylacetamide, dioxane, diethyl ether, diethylene dithioglycol, diacetone alcohol, benzonitrile, dimethyl sulfoxide, etc., which may be used alone or in combination of two or more. Can be used in combination with. 6-2 Film Formation To form a film on the surface of a vinyl chloride resin film, various known methods are applied depending on the shape of the molded product. For example, when forming a film in a solution state, doctor blade coating method, gravure roll coating method, air knife coating method, reverse roll coating method, dip coating method, curtain roll coating method,
Application methods such as spray coating and rod coating are used. When the coating composition described in 6-1 is formed as a single coating without forming it into a solution, a coextrusion method, an extrusion coating method, an extrusion lamination method, and a lamination method are used. When a coating method is used as a film forming method, there are, for example, natural drying methods, hot air drying methods, infrared drying methods, far infrared drying methods, etc., but if drying speed and safety are taken into account, Hot air drying methods are advantageous. In this case, the temperature conditions are in the range of 50 to 150℃, and the time is
It is best to choose between 10 seconds and 15 minutes. In the present invention, the thickness of the coating formed on the surface of the base film is preferably 1/10 or less of the thickness of the base film. If the thickness of the coating is more than 1/10 of the base film, there is a difference in flexibility between the base film and the coating, so phenomena such as peeling of the coating from the base film tend to occur, and cracks may occur in the coating. This is undesirable because it causes a phenomenon in which the strength of the base film decreases. In addition, before applying the above film composition, the surface of the soft vinyl chloride resin film may be cleaned with alcohol or water, subjected to plasma discharge treatment or corona discharge treatment, or undercoated with other paint or primer. Pretreatment such as the following may be performed. Hereinafter, the present invention will be explained in detail based on examples, but the present invention is not limited to the following examples unless it exceeds the gist thereof. Examples 1 to 5, Comparative Examples 1 to 6 Preparation of base film Polyvinyl chloride (P=1400) 100 parts by weight Dioctyl phthalate 50 Epoxidized soybean oil 3 Barium-zinc composite liquid stabilizer 1.5 Barium stearate 0.2 〃 Zinc stearate 0.4 〃 Sorbitan laurate 1.5 〃 2,4-dihydroxybenzophenone
A resin composition consisting of 0.5 〃 was prepared, and organic phosphate esters or organic phosphate metal salts of the types and amounts shown in Table 2 were blended. Each formulation was stirred and mixed using a super mixer for 10 minutes, and then kneaded on a mill roll heated to 180°C to prepare a base film with a thickness of 0.15 mm. Preparation of acrylic resin [A] Methyl ethyl ketone was added to a reactor equipped with a thermometer, a stirrer, a reflux condenser, and a nozzle for adding raw materials.
70 parts by weight, 30 parts by weight of toluene, benzoyl peroxide
1.0 parts by weight and a mixture of each monomer shown in Table 1
100 parts by weight of benzoyl peroxide was charged, stirred in a nitrogen gas stream for 3 hours at 70°C, and further 0.5 parts by weight of benzoyl peroxide was added, and the reaction was continued at the same temperature for about 3 hours to prepare Resin A, which is an acrylic resin. ~c was obtained. Preparation of fluorine-containing acrylic resin [B] In a reactor similar to that used, 70 parts by weight of methyl ethyl ketone, 30 parts by weight of toluene, and 1.0 parts by weight of benzoyl peroxide were added.
Parts by weight and mixture of each monomer shown in Table 1 100
Add parts by weight and stir in a nitrogen gas stream,
0.5 parts by weight of benzoyl peroxide was further added at 80° C. for 3 hours, and the reaction was continued at the same temperature for about 3 hours to obtain resins d to f, which are fluorine-containing acrylic resins. Preparation of coating composition and coating formation on base film Acrylic resin [A] and fluorine-containing acrylic resin [B] of the type and amount shown in Table 2 are blended,
To the main component of the film prepared by adding methyl ethyl ketone to the solid content so that the solid content is 20% by weight, organic nitrogen-based algaecides of the types shown in Table 2 are added in the proportions listed in the table (relative to the resin solid content). (meaning weight ratio) to obtain a coating composition. Each of the above coating compositions was applied to one side of the base film prepared by the above method using a #5 bar coater. The coated film was kept in an oven at 130° C. for 1 minute to volatilize the solvent. The amount of coating on each film obtained is approximately 2 g/m ²
It was hot. Evaluation of Film The performance of each film was evaluated using the following methods, and the results are shown in Table 3. Initial Appearance The appearance of the film was observed with the naked eye. The evaluation criteria are as follows. ◎...It is colorless and has excellent transparency. ○...Slightly white, but transparent. △: White and translucent. ×...Things that are cloudy and devitrified. Flexibility of Film Each film was cut into pieces of 5 cm wide and 15 cm long, and folded back alternately at 2 cm intervals in a direction perpendicular to the length. 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 removed, the folds of the film were stretched out, and the appearance of the film was observed with the naked eye. The evaluation criteria are as follows. ◎…No change is observed in the film at the crease. △...Cracks are observed in the coating at the creases. ×: Cracks are significantly observed in the coating at the creases. Outdoor expansion test Eleven types of films were placed in a roof-type greenhouse (frontage 3m, depth 5m, ridge height 1.5m, roof slope 30 degrees) adjacent to a test field in Isshi District, Mie Prefecture, and the surface coated with an acrylic resin coating was Covered on the outside of the Showa era
Expansion tests were conducted for two years from June 1963 to May 1990. For the expanded ilm, use the following method.
The elongation retention rate, algae resistance, and dust resistance of the film were evaluated. Elongation retention rate of film...means a value calculated by the following formula. Elongation of film after outdoor expansion/Elongation of film before outdoor expansion x 100 (%) Algae resistance: Observation of algae growth with the naked eye. The evaluation criteria are as follows. ◎…No algae growth observed on the surface. ○…Slight algae growth is observed on the surface. △…Significant algae growth is observed on the surface. ×: Algae has grown and grown over the entire surface. Dustproof property…Means the value calculated using the following formula: Light transmittance of film collected over time after outdoor expansion/Light transmittance of film before outdoor expansion**100
(%) *Direct light transmittance at a wavelength of 555 mμ (manufactured by Hitachi, EPS-2U type used) The measurement results were displayed as follows. ◎...Light transmittance after expansion is 90% or more of that before expansion. ○...The light transmittance after expansion is in the range of 70 to 89% of that before expansion. △...The light transmittance after stretching is in the range of 50 to 69% of that before stretching. ×...The light transmittance after expansion is less than 50% of that before expansion.

【table】

【table】

【table】

[Table] "Effects of the Invention" The present invention has the following effects, and its industrial utility value is extremely large. (1) Even when the agricultural vinyl chloride resin film according to the present invention is extended outdoors for a long period of time, there is little deterioration in algae-proofing properties, dust-proofing properties, and physical properties, and it can withstand long-term use. (2) The agricultural vinyl chloride resin film according to the present invention has excellent adhesion between the base film and the coating derived from a specific acrylic resin coating composition formed on the surface thereof, so that the coating does not peel off. Durable and durable for long-term use.

Claims (1)

[Claims] 1. A mixture containing 60 parts by weight or more of an alkyl ester of acrylic acid or methacrylic acid is polymerized on one or both sides of a vinyl chloride resin film containing an organic phosphate ester or an organic phosphate metal salt. Acrylic resin [A] and alkyl esters of acrylic acid or methacrylic acid 60
-95 parts by weight of an organic nitrogen-based organic nitrogen-based resin whose main components are fluorine-containing acrylic resin [B] obtained by polymerizing a mixture of 40 to 5 parts by weight of perfluoroalkyl esters of acrylic acid or methacrylic acid. Agricultural vinyl chloride resin film on which a coating containing an algaecide is formed.