JPH0566868B2 - - 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 undesirable deterioration phenomena such as discoloration, embrittlement, and reduction in dustproof properties caused by outdoor spreading, and has improved durability. "Prior Art" Conventionally, for the purpose of preventing the photodeterioration phenomenon caused by sunlight etc. of vinyl chloride resin films used as coating materials for agricultural greenhouses or tunnels,
The technology of adding and blending ultraviolet absorbers and/or antioxidants to the base vinyl chloride resin to form a film has been widely adopted (for example,
(See Publication No. 37459, Japanese Patent Publication No. 53-47383, etc.)
According to this method, harmful light rays that promote film deterioration are gradually absorbed and weakened as they pass through the film from the incident side to the opposite side. In this case, the side of the film on which the light rays are incident is damaged by harmful rays, resulting in the drawback that the weather resistance of the film cannot be sufficiently improved. On the other hand, based on conventional experience, soft vinyl chloride resin films used for agricultural purposes are spread to different degrees depending on the region and place where they are used.
After two years have passed since the start of use, the dust-proofing properties of the outside surface of the house or tunnel deteriorate significantly, and it becomes unusable. As a way to eliminate the above drawbacks,
Publication No. 28740, Japanese Patent Publication No. 1983-31195, Japanese Patent Publication No. 1983
As described in Japanese Patent Publication No. 99237, Japanese Patent Publication No. 56-99665, etc., there is a method of forming a coating of a specific acrylic resin on one or both sides of a vinyl chloride resin film as a substrate. In addition, JP-A-51-
Publication No. 70282 describes a method of forming a film of an acrylic resin of a specific composition containing an ultraviolet absorber on the surface of a film of a substrate. but,
The films formed on the base film in these methods are mainly made of thermoplastic resin, so the additives contained in the base film can pass through the film and reach the surface, especially during the summer when the outside temperature is high. to migrate, to be washed away and to disappear,
It is difficult to completely suppress it, and there are still problems when the film is stretched and used outdoors for a long period of time. Therefore, in order to further improve the above-mentioned drawbacks, Japanese Patent Application Laid-Open No. 56-53070, Japanese Patent Application Laid-Open No. 57-70031,
As described in JP-A-57-163568, etc., a method has been proposed in which at least one surface of a vinyl chloride resin film is coated with a cationic polymerizable energy ray curable resin composition. However, the epoxy resin composition preferably used as a cationically polymerized energy beam-curable resin composition according to this method is susceptible to weather resistance deterioration in the film formed from it, and cannot sufficiently achieve the intended purpose. There was a drawback that there was no. "Problems to be Solved by the Invention" Under such circumstances, the present inventors have discovered that undesirable deterioration phenomena such as discoloration, embrittlement, and reduction in dust resistance caused by spreading outdoors can be significantly reduced. The present invention has been completed as a result of intensive studies aimed at providing an improved agricultural vinyl chloride resin film with improved durability. "Means for Solving the Problems" The above problems can be solved by using the agricultural vinyl chloride resin film according to the present invention. That is, the gist of the present invention is to provide a silane having a hydrolyzable group directly bonded to a silicon atom on one or both sides of a soft vinyl chloride resin film containing an organic phosphate ester and/or an organic phosphate metal salt. The present invention relates to an agricultural vinyl chloride resin film characterized in that a film containing a compound and a specific acrylic resin as main components is formed under heat treatment. The present invention will be explained in detail below. In the present invention, the vinyl chloride resin includes not only polyvinyl chloride but also copolymers whose main component is vinyl chloride. Examples of monomer compounds that can be copolymerized with vinyl chloride include vinylidene chloride, ethylene, propylene, acrylonitrile, 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 adjusting the amount of the plasticizer within the above range, it is possible to impart excellent flexibility and mechanical properties to the target vinyl chloride resin film. Examples of the plasticizer include di-n-octyl phthalate, di-2-ethylhexyl phthalate,
Phthalic acid derivatives such as dibenzyl phthalate, diisodecyl phthalate, didodecyl phthalate, and diundecyl phthalate; Isophthalic acid derivatives such as dioctyl phthalate; Adipic acid derivatives such as di-n-butyl adipate and 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. The agricultural vinyl chloride resin film of the present invention is
The vinyl chloride resin is blended with an organic phosphate ester and/or an organic phosphate metal salt. Examples of organic phosphoric acid esters include triisopropylphenyl phosphate, isodecyl diphenyl phosphate, tricresyl phosphate, tris(isopropylphenyl) phosphate, tributyl phosphate, triethyl phosphate, trioctyl phosphate, and tributoxyethyl. Examples include phosphate, triphenyl phosphate, octyl diphenyl phosphate, and tricylenyl phosphate, among which tricresyl phosphate and tricylenyl phosphate are particularly preferred. Furthermore, a composite material containing an organic phosphate ester as a main component can also be used. For example, a composite of an organic phosphoric acid ester and an organic phosphorous ester can be mentioned. Also included are phosphonate compounds such as diphenylphosphonate. These are generally plasticizers for vinyl chloride resins, and improve the weather resistance of the film, and together with the formed film, improve the dust resistance. These organic phosphate esters can be used alone or in combination of two or more. As the organic phosphate metal salt, the general formula [] or [] (In the formula, M means zinc, calcium, barium, magnesium, cobalt or strontium. Also, R ¹ , R ² and R ³ each represent an alkyl, aryl, arylalkyl, alkylaryl or ether bond. (means an alkyl group having the same alkyl group). 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, decyl, isodecyl, 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, -1,3-diethyl ether, -1-ethyl-
2-propyl ether residue; nonylphenoxypolyethoxyethyl, lauroxypolyethoxyethyl residue, and the like. Furthermore, among the metals, zinc, calcium and barium are particularly preferred. The organic phosphate metal salts having various substituents as described above can be blended singly or in combination of two or more. The amount of organic phosphate ester and/or organic phosphate metal salt is within the range of 0.1 to 15 parts by weight, preferably 0.2 to 15 parts by weight, based on 100 parts by weight of vinyl chloride resin.
It shall be selected within a range of 10 parts by weight. The amount of compounding
If the amount is less than 0.1 part by weight, the weather resistance and dust resistance of the soft vinyl chloride resin film will not improve. Contains 15
If the amount is more than 1 part by weight, the transparency of the film will be extremely poor, which is not preferable. 0.2 within the above range
-8 parts by weight is particularly preferred. In addition to the above-mentioned plasticizer, organic phosphate ester and/or organic phosphate metal salt, the vinyl chloride resin may contain, if necessary, known resin additives that are usually blended into synthetic resins for molding. For example, lubricants, heat stabilizers, ultraviolet absorbers, antioxidants, stabilizing aids, antistatic agents, antifogging agents, antifungal agents, antialgae agents, inorganic fillers, colorants, etc. can be added. . 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, β-diketone compounds, and piperidine-based hindered amine compounds. can give. 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 above-mentioned plasticizer, organic phosphate ester and/or organic phosphate metal salt, and other resin additives into the vinyl chloride resin that will be the base of the film, the necessary amounts of each are weighed, and then the necessary amounts are weighed out using a ribbon blender or Banbury. Mixers, super mixers, and other conventionally known blenders and mixers may be used. . In order to form a film from the resin composition obtained in this way, methods known per se may be used, such as melt extrusion molding method (including T-die method and inflation method), calender molding method, solution casting method. etc. In order to improve the anti-fogging properties and anti-blocking properties of the film formed in this way, when the coating according to the present invention is on one side of the film,
A coating layer made of another resin, such as an acrylic resin, a fluorine resin, or a polyolefin resin, may be provided on the other film surface. The agricultural vinyl chloride resin film of the present invention is
A film containing a silane compound and a specific acrylic resin as main components is formed on one or both sides of the film under heat treatment. The silane compound used in the present invention has a hydrolyzable group directly bonded to a silicon atom. Specifically, aminomethyltriethoxysilane, N-β-aminoethylaminomethyltrimethoxysilane, γ-aminopropyltrimethoxysilane, N-(trimethoxysilylpropyl)-ethylenediamine, N-(dimethoxymethylsilylpropyl) - Aminoalkylalkoxysilane such as ethylenediamine; γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldimethoxysilane, β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, β
- Epoxyalkylalkoxysilanes such as (3,4-epoxycyclohexyl)ethylmethyldimethoxysilane; mercaptoalkylalkoxysilanes such as γ-mercaptopropyltrimethoxysilane, γ-mercaptopropylmethyldimethoxysilane; tetramethoxysilane, tetraethoxysilane, Tetraalkoxysilanes such as tetrabutoxysilane, trimethoxyneopentoxysilane, dimethoxydineopentoxysilane; methyltrimethoxysilane, methyltriethoxysilane,
Alkyltrialkoxysilanes such as ethyltrimethoxysilane and ethyltriethoxysilane; Dialkyldialkoxysilanes such as dimethyldimethoxysilane and dimethyldiethoxysilane; γ-chloropropyltrimethoxysilane and 3,3,3-trichloropropyltrimethoxysilane halogenated alkylalkoxysilanes such as methyltriacetoxysilane, dimethyldiacetoxysilane; hydrosilane compounds such as trimethoxysilane, triethoxysilane; vinyltrimethoxysilane, vinylethoxysilane, vinyltris(β-methoxysilane); ethoxy)
Silane, allyltriethoxysilane, γ-(meth)
Acryloxypropyltrimethoxysilane, γ-
Examples include monomers or polymers of unsaturated group-containing silane compounds such as (meth)acryloxypropyltriethoxysilane and γ-(meth)acryloxypropylmethyldiethoxysilane, as well as hydrolysates thereof. A hydrolyzate is synthesized, for example, by adding water to a silane compound having a hydrolyzable group in the presence of an acid or alkali catalyst in a combined alcohol system, and the hydrolyzate has a hydrolyzable group. When more than an equivalent amount of water is added to the silane compound, a completely hydrolyzed alcoholic silica gel or silica sol or siloxane-based composite is obtained; when less than an equivalent amount of water is added, hydration is added according to the ratio. A decomposition product is prepared. Among these silane compounds, the general formula (R ¹ O) ₃ Si[OSi(OR ² ) ₂ ] _o (OR ³ ), where R ¹ to R ³
each represents the same or different alkyl group, aryl group, alkylaryl group, arylalkyl group, aryloxyalkyl group, or alkyloxyalkyl group, and n represents 0 or a positive integer. )
Preferred are tetraalkoxysilane monomers or polymers represented by the above, and compounds obtained by hydrolyzing hydrolyzable groups. Among them, especially R ¹ to ^{R 3}
are preferably the same or different alkyl groups having up to 4 carbon atoms. These silane compounds may be used alone or in combination of two or more. The acrylic resin in the present invention refers to an alkyl ester of acrylic acid or methacrylic acid (hereinafter referred to as (meth)acrylic acid alkyl ester) monomer alone or a mixture of this and an alkenylbenzene monomer. , and copolymerizable α,
It is obtained by polymerizing a β-ethylenically unsaturated monomer under normal polymerization conditions. Examples of the (meth)acrylic acid alkyl esters used in the present invention include acrylic acid methyl ester, acrylic acid ethyl ester, acrylic acid n-propyl ester, acrylic acid isopropyl ester, acrylic acid n-butyl ester, and acrylic acid methyl ester. -2-ethylhexyl ester,
Examples include decyl acrylate, methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, 2-ethylhexyl methacrylate, and decyl methacrylate. Generally, acrylic acid alkyl esters having an alkyl group having 1 to 20 carbon atoms and/or methacrylic acid alkyl esters having an alkyl group having 1 to 20 carbon atoms are used. Examples of the alkenylbenzenes used in the present invention include styrene, α-methylstyrene, and vinyltoluene. Such alkenylbenzenes and (meth)
When using a monomer mixture with acrylic acid alkyl esters, it usually depends on the amount of α,β-ethylenically unsaturated monomer used (meth).
The proportion of the acrylic acid alkyl ester used is preferably 10% by weight or more. Examples of other copolymerizable α,β-ethylenically unsaturated monomers used to obtain the acrylic resin of the present invention include acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, and crotonic acid. α, β-ethylenically unsaturated carboxylic acids such as , itaconic acid; α, β-ethylenically unsaturated sulfonic acids such as ethylene sulfonic acid; 2-acrylamido-2-methylpropanes; α, β-
Examples include ethylenically unsaturated phosphonic acids; acrylonitriles; acrylamides; amino esters of acrylic acid or methacrylic acid; glycidyl esters of acrylic acid or methacrylic acid; acrylic acid or methacrylates. These monomers may be used alone or in combination of two or more. Examples of the polymerization initiator used in producing the acrylic resin of the present invention include persulfates such as ammonium persulfate and potassium persulfate; organic peroxides such as acetyl peroxide and benzoyl peroxide. These are used in an amount of 0.1 to 10% by weight based on the total amount of monomers charged. Acrylic resin can be produced using bulk polymerization method, solution polymerization method,
It can be produced by any polymerization method such as suspension polymerization or emulsion polymerization. The obtained acrylic resin can be further added with a compound such as vinyl chloride/vinyl acetate resin, vinyl chloride resin, cellulose ether, etc. The mixing ratio of the silane compound [A] and the acrylic resin [B] is preferably such that the weight ratio of [A] to [B] is in the range of 20:1 to 1:15. When the proportion of the silane compound [A] is above the above range,
This is undesirable because the formed film becomes brittle and has poor adhesion to the base material, making it easy to peel off.
Furthermore, if the proportion of the acrylic resin [B] is above the above range, the effects of weather resistance and dust resistance will not be noticeable, which is not preferable. Among the above ranges, it is particularly preferable that [A] to [B] be in the range of 15:1 to 1:10. A liquid dispersion medium may be further added to the above composition as required. Such liquid dispersion media include monohydric alcohols such as methyl alcohol, ethyl alcohol, and isopropyl alcohol; polyhydric alcohols such as ethylene glycol, diethylene glycol, and glycerin; cyclic alcohols such as dibenzyl alcohol; and cellosolve acetates. ; Examples include ketones. These liquid dispersion media may be used alone or in combination, but they may affect the dispersion stability of the coating composition, the wettability after coating on the film surface, the difficulty of removing the liquid dispersion medium,
It is preferable to decide based on economic efficiency. The above composition may further contain small amounts of acid or alkaline antifoaming agents, surfactants, lubricants, antistatic agents, plasticizers, antioxidants, ultraviolet absorbers, light stabilizers, film-forming aids, Customary additives such as thickeners, fungicides, algaecides, pigments, pigment dispersants, and inorganic fillers can be mixed. Various known methods can be used to apply the coating composition to form a coating on the surface of the soft vinyl chloride resin film. 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, brush coating method, spray coating method, bar coating method, knife coating method Any method known per se may be used. When the coating composition is formed as a single film without being in a solution state, a coextrusion method, an extrusion coating method, an extrusion lamination method, and a lamination method are used. A film derived from the above coating composition is formed on the surface of a flexible vinyl chloride resin film under heat treatment. The heat treatment chemically bonds the silane compound and the acrylic resin, resulting in a strong film with excellent barrier properties against weather-resistant deterioration factors and pollutants, improving weather resistance and dust resistance.
Heat treatment methods when using a coating method as a coating method include, for example, hot air heating, infrared heating, far infrared heating, etc. However, in consideration of heat treatment efficiency and safety, hot air heating is advantageous. In this case, the temperature condition is in the range of 50 to 200℃,
It is best to choose a time between 10 seconds and 60 minutes. The adhesion amount of the film formed on the surface of the soft vinyl chloride resin film during heat treatment is 0.1 to 10.
A range of g/m ² is preferred. If it is less than 0.1 g/m ² , the effect of preventing the plasticizer from migrating to the surface of the soft vinyl chloride resin film is insufficient. Moreover, if it is 10 g/m ² or more, the amount of coating is too large, which may be economically disadvantageous, and the mechanical strength of the film itself may decrease. Therefore, a range of 0.5 g/m ² to 7 g/m ² is usually most preferred. In addition, before coating with the above-mentioned coating composition, the surface of the soft vinyl chloride resin film is washed 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. When the agricultural vinyl chloride resin film according to the present invention is actually used for agricultural purposes, when the coating is formed on only one side, the side on which the coating is provided should be placed on the outside of the house or tunnel. Use it as follows. "Function" The agricultural vinyl chloride resin film according to the present invention has a coating derived from a specific coating composition formed on its surface, and this coating prevents the various resin additives blended into the film from seeping out. Even if the film is stretched outdoors for a long period of time, there will be little surface contamination and less decrease in light transmittance. This coating also has excellent flexibility and adhesion. In addition, the base film is coated with organic phosphate ester and/or
Or, because it contains an organic phosphate metal salt, it has a high elongation retention rate and excellent durability. "Examples" The present invention will be described in detail based on Examples below, but the present invention is not limited to the following examples as long as it goes beyond the gist thereof. Examples 1 to 6, Comparative Examples 1 to 5 Preparation of base film Polyvinyl chloride (=1400) 100 parts by weight Dioctyl phthalate 50 〃 Epicoat 828 (epoxy compound, trade name manufactured by Shell Company, USA) 1 〃 Ba/Zn-based composite stable 1.5 〃 Barium stearate (stabilizer) 0.2 〃 Zinc stearate 0.4 〃 Sorbitan monolaurate 1.5 〃 Prepare a resin composition consisting of 1.5 〃 Barium stearate (stabilizer) 〃 〃 Sorbitan monolaurate 1.5 〃 Organic phosphate ester and/or organic phosphate ester of the type and amount shown in Table 2. Contains metal phosphate. However, comparative example (1,
In the case of 2), it was not 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 Production Examples 1 to 4 Into a reactor equipped with a thermometer, a stirrer, a reflux condenser, and a nozzle for adding raw materials, 100 parts by weight of isopropyl alcohol, 1.0 parts by weight of benzoyl peroxide, and the ingredients shown in Table 1 were added. Add 100 parts by weight of each monomer mixture and heat at 80℃ for 3 hours while stirring in a nitrogen gas stream.
Further, 0.5 parts by weight of benzoyl peroxide was added and the reaction was continued for about 3 hours at the same temperature to obtain acrylic resins A to D. Formation of film: Blend the silane compound and acrylic resin in the type and amount shown in Table 2, add isopropyl alcohol to the solid content so that the solid content is 20% by weight,
A coating composition was obtained. However, in Comparative Example 1, no silane compound was blended. Furthermore, in Comparative Example 2, no acrylic resin was blended. On one side of the base film prepared by the above method,
The above coating composition was applied using a #5 bar coater,
Each was applied. The coated film was held in an oven at 130° C. for 3 minutes to volatilize the solvent and simultaneously perform heat treatment. However, in Comparative Example 5, after applying the coating composition, the solvent was volatilized by natural drying without heat treatment. The amount of coating on each film obtained was approximately 2 g/m ² . Evaluation of the film The performance of the film was evaluated using the following methods.
The results are shown in Table 2. Film flexibility Cut each film into 5cm wide and 15cm long pieces.
It was folded back alternately at 2 cm intervals in the direction perpendicular to the length direction. 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 results are shown in Table 2. The evaluation criteria for this test are as follows. ◎…No change is observed in the film at the crease. △...Clutching is observed in the film at the crease. ×: Clutching is significantly observed in the coating at the crease. Outdoor expansion test Eleven types of films were placed in a roof-type greenhouse (3 m wide, 5 m deep, ridge height 1.5 m, roof slope 30 degrees) installed in a test field in Ichishi District, Mie Prefecture, with the coated side facing outside of the house. Covered in 1985
Expansion tests were conducted for two years from April 1980 to March 1988. For the stretched film, the film appearance test and film elongation retention were measured by the following method, and the film during the stretching test was evaluated.
Dust resistance was evaluated. Film appearance: Appearance observed with the naked eye.
The evaluation criteria are as follows. ◎…No change in appearance such as discoloration is observed. ○…Some changes in appearance such as slight discoloration are observed. △...Significant changes in appearance such as discoloration are observed. ×: Discoloration is observed on the entire surface. Film elongation means a value calculated using the following formula. Elongation of film after outdoor expansion/Elongation of film before outdoor expansion x 100 (%) Dustproof property: means the value calculated by the next expansion. Light transmittance of film collected over time after outdoor expansion / Light transmittance of film before outdoor expansion _* ×1
00 (%) * Direct light transmittance at a wavelength of 555 mμ (manufactured by Hitachi, EPS-2U type used) The measurement results were displayed as follows. ◎...The light transmittance after expansion is 90% or more of that before expansion. ○…Light transmittance after expansion is 70-89% of before expansion
Those in the above range. △...Light transmittance after expansion is 50-69% of before expansion
Those in the above range. ×...The light transmittance after expansion is less than 50% of that before expansion.

【table】

【table】

[Table] "Effects of the Invention" As is clear from the examples above, the present invention has the following effects:
It has the following effects and has extremely great agricultural utility value. (1) Even when the agricultural vinyl chloride resin film according to the present invention is stretched outdoors for a long period of time, there is little discoloration, deterioration in physical properties, or deterioration in dust resistance, and it can be used for a long period of time. (2) The agricultural vinyl chloride resin film according to the present invention has a coating formed on the surface of the base film that has excellent adhesion to the base film and is highly flexible, so the coating is difficult to peel off. , durable for long-term use.

Claims (1)

[Scope of Claims] 1. A silane compound [A] having a hydrolyzable group directly bonded to a silicon atom on one or both sides of a soft vinyl chloride resin film containing an organic phosphate ester and/or an organic phosphate metal salt. and alkyl esters of acrylic acid or methacrylic acid (hereinafter referred to as (meth)acrylic acid alkyl esters), or a mixture of this and an alkenylbenzene monomer, and copolymerized An agricultural vinyl chloride resin film in which a film mainly composed of an acrylic resin [B] obtained by polymerizing a polyurethane α,β-ethylenically unsaturated monomer is formed under heat treatment. . 2 The silane compound [A] has the general formula (R ¹ O) ₃ Si
[OSi(OR ² ) ₂ ] _o (OR ³ ) (wherein R ¹ to R ³ are each,
They represent the same or different alkyl groups, aryl groups, alkylaryl groups, arylalkyl groups, aryloxyalkyl groups, or alkyloxyalkyl groups, and n represents 0 or a positive integer. 2. The agricultural vinyl chloride resin film according to claim 1, which is a compound obtained by hydrolyzing a tetraalkoxysilane monomer or polymer represented by () or a hydrolyzable group.