JPH01184130A - Agricultural vinyl chloride resin film - Google Patents

Abstract

PURPOSE:To enhance durability by preventing unpreferable deterioration phenomena such as discoloration, embrittlement, lowering in dust-resistance or the like, by forming a film based on a specific silane compound and a specific acrylic resin to the single surface or both surfaces of a soft vinyl chloride resin film under heat-treatment. CONSTITUTION:An agricultural vinyl chloride resin film is formed from a composition wherein a vinyl chloride resin is compounded with organophosphoric ester and/or organometal phosphate. A film based on a silane compound and a specific acrylic resin is formed to the single surface or both surfaces of the agricultural vinyl chloride resin under heat-treatment. The above-mentioned silane compound has a hydrolyzable group directly bonded to a silicon atom. As the silane compound, a monomer of tetraalkoxysilane represented by formula (R<1>O)3Si[OSi(OR<2>)2]n(OR<3>) (wherein R<1>-R<3> are an alkyl group, an aryl group or an alkylaryl group and (n) is 0 or a positive integer), a polymer thereof, a compound obtained by hydrolyzing the hydrolyzable group is pref.

Description

[Detailed description of the invention] "Industrial application field" The present invention relates to an agricultural vinyl chloride resin film.

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 dust resistance caused when stretched outdoors, and has improved durability.

"Prior Art" Conventionally, in order to prevent photodeterioration of vinyl chloride resin films used as covering materials for agricultural greenhouses or tunnels due to sunlight, UV absorbers and/or Or add and blend antioxidants,
Film-forming technology is widely adopted (for example, Japanese Patent Publication No. 48-37459, Japanese Patent Publication No. 53-47383).
(Refer to the publication number, 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, the soft vinyl chloride resin film used for agricultural purposes has been stretched to a certain extent depending on the region and place where it is used.
Over the years, the dust-proofing properties of the outside surfaces of the house or tunnel deteriorate so much that they become unusable.

As a method to eliminate the above drawbacks,
Publication No. 0, Japanese Patent Publication No. 50-31195, Japanese Patent Application 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. Furthermore, JP-A-51-70282
The publication describes a method of forming a coating of an acrylic resin of a specific composition containing an ultraviolet absorber on the surface of a film of a substrate. However, since the coating formed on the base film in these methods is mainly made of thermoplastic resin, the additives contained in the base film may pass through the coating, especially during the summer when the outside temperature is high. It is difficult to completely prevent the film from migrating to the surface, being washed away, and disappearing, and there are still problems in using the film by stretching it outdoors for a long time.

Therefore, in order to further improve the above-mentioned drawbacks,
-53070 publication, Japanese Patent Application Laid-Open No. 57-70031,
As described in JP-A-57-163568 and the like, 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, it is said that the epoxy resin composition preferably used as a cationic polymerized energy beam curable resin composition according to this method is susceptible to weather resistance deterioration in the film formed from it, and cannot fully achieve the intended purpose. There were drawbacks.

[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 improved. The present invention was completed as a result of intensive studies aimed at providing an 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 use a silane compound 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 an agricultural vinyl chloride resin film characterized in that a film containing a specific acrylic resin as a main component 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 copolymerizable 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, 11-turbidity polymerization, solution polymerization, and bulk polymerization.

In order to impart flexibility to the vinyl chloride resin serving as the base, 20 to 60 parts by weight are added to 100 parts by weight of the resin.
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 target vinyl chloride resin film.

As a plasticizer, for example, heptatalic acid derivatives such as di-n-octyl 7-talate, di-2-ethylhexyl 7-talate, nobennol 7-talate, diisodecyl 7-talate, didodecyl 7-talate, and diisodecyl 7-talate; dioctyl 7-talate, etc. Isophthalic acid derivatives; Adipic acid derivatives such as di-n-butyl adipate and dioctyl anovate; Maleic acid derivatives such as di-n-butyl maleate; Citric acid derivatives such as tri-n-butyl citrate:
Itaconic acid derivatives such as monobutyl itaconate; oleic acid derivatives such as butyl oleate; ricinoleic acid derivatives such as glycerin monoline/late; and others such as epoxidized soybean oil and epoxy resin plasticizers.

The agricultural vinyl chloride resin film of the present invention includes organic phosphate ester and/or fi
Contains metal phosphate.

Examples of organic phosphoric acid esters include triisopropylphenyl phosphate, indecyl diphenyl phosphate, triphrenol phosphate, tris (isopropylphenyl) phosphate, tributyl phosphate, triethyl phosphate, trioctyl phosphate, tributoxyethyl phosphate, triphenyl phosphate,
There are octyl diphenyl phosphate, trixylenyl phosphate, etc. Among them, trifrenol phosphate,
and tricylenyl phosphate are particularly preferred.

Furthermore, compounds containing organic phosphate esters 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 they improve the weather resistance of the film and, together with the formed film, improve the dust resistance. These ml) acid esters may be used alone or in combination of two or more.

As the fi+7 acid metal salt, general formula [11 or [
II] (wherein M means zinc, calcium, barium, magnesium, cobalt or strontium; R1, R2 and R3 each represent alkyl, aryl,
It means arylalkyl, alkylaryl, or an alkyl group having an ether bond. ) are listed.

Examples of alkyl groups represented by R1, R2 and R3 include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, amyl, neopentyl, isoamyl, hexyl, isohexyl, heptyl, octyl, in octyl, 2-ethylhexyl,
Decyl, isodecyl, lauryl, tridecyl, CI2~
C53 mixed alkyl, stearyl, cyclopentyl, cyclohexyl, cyclooctyl, cyclododecyl, 4-
Examples include methylcyclohexyl group.

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,
Examples include ethylphenyl, butylphenyl, tert-butylphenyl, octylphenyl, in-octylphenyl, tertiary-octylphenyl, /nyl7er, 2,4-c-tert-butylphenyl group, 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, inbutyl, hexyl
, cyclohexyl-, phenyl cellosol residue; methyl-, ethyl-, isopropyl-, butyl-, inbutylcarpitol residue; triethylene glycol monomethyl ether, -monoethyl ether, -monobutyl ether residue; glycerin j, 2-nomethyl ethyl, -1,3-shell ether, -1-ethyl-2-propyl ether residues; nonylphenoxypolyethoxyethyl, lauroxypolyethoxyethyl residues, and the like. Furthermore, among the metals, zinc, calcium and barium are particularly preferred.

The fi IJ acid 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 0.1 to 100 parts by weight of vinyl chloride resin.
It is selected within the range of 15 parts by weight, preferably within the range of 0.2 to 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. 0 within the above range.
Particularly preferred is 2 to 8 parts by weight.

In addition to the above-mentioned plasticizer, organic phosphate ester and/or fi-IJ acid metal salt, the vinyl chloride resin may contain, if necessary, a known resin that is usually blended into synthetic resins for molding. Additives, such as lubricants, heat stabilizers, ultraviolet absorbers, antioxidants, stabilization aids, antistatic agents, antifogging agents,
Anti-fungal agents, anti-algae agents, iflj-free fillers, colorants, etc. can be blended.

Examples of lubricants, heat stabilizers, and antioxidants that can be blended into the film according to the present invention include polyethylene wax, bisamide compounds, liquid paraffin, and polyethylene wax. Examples include 7-osphite compounds, β-diketone compounds, and piperidine-based hinged amine compounds.

The above various resin additives can be used alone or in combination.

The amount of the various resin additives added 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.

The above-mentioned plasticizer, a phosphoric acid ester and/or a phosphoric acid ester are added to the vinyl chloride resin that serves as the base of the film.
To blend the acid metal salts and other resin additives, weigh the required amounts of each and mix with a ribbon blender or Banbury mixer.
, Super Mixer, and other conventionally known blenders and mixers may be used. .

The resin composition thus obtained can be formed into a film by a method known per se, such as melt extrusion method (T-
(including the Gouy method and the In7resigin method), a calendar molding method, a solution casting method, and the like.

In order to improve the anti-fogging properties and anti-blocking properties of the film, the film formed in this way is coated with another resin on the other film surface, for example, when the coating according to the present invention is on one side of the film. 'A coating layer made of acrylic resin, 77 element resin, or polyolefin resin may be provided.

The agricultural vinyl chloride resin film of the present invention has a coating mainly composed of a silane compound and a specific acrylic resin formed on one or both surfaces thereof 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
-7 Minoethylaminomethyltrimethoxysilane, γ-
7 Aminoalkylalkoxysilanes such as minoprobyltrimethoxysilane, N-()rimethoxysilylbrobyl)-ethylenediamine, N-(ditoxymethylsilylprobyl)-ethylenediamine; γ-glycidoxyprobyltrimethoxysilane , γ-glycidoxypropylmethyldimethoxysilane, β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane,
Epoxyalkylalkoxysilanes such as -epoxycyclohexyl)ethylmethylditoxysilane; Mercaptoalkylalkoxysilanes such as γ-mercaptopropyltrimethoxysilane and γ-mercaptopropylmethylnomethoxysilane; Tetramethoxysilane, tetraethoxysilane, and tetrabutoxysilane , trimethoxyneopentoxysilane, dimethoxydineobentoxysilane; alkyltrialkoxysilanes such as methyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane; dimethyldimethoxysilane, Dialkyldialkoxysilane such as dimethyljethoxysilane; γ-chloropropyltrimethoxysilane, 3,3
．． Halogenated alkyl alkoxysilanes such as 3-trichloropropyltrimethoxysilane; Alkylacyloxysilanes such as methyltriacetoxysilane and dimethyldiacetoxysilane; Hydrosilane compounds such as trimethoxysilane and triethoxysilane; Vinyltrimethoxysilane and vinyl ethoxy Silane, vinyltris(β-methoxyethoxy)silane, allyltriethoxysilane,
Monomers or polymers of unsaturated group-containing silane compounds such as γ-(meth)acryloxypropyltrimethoxysilane, γ-(meth)acryloxypropyltriethoxysilane, γ-(meth)acryloxypropylmethyldimethoxysilane, etc. , and further include their hydrolysates.

The hydrolyzate can be prepared, for example, in the presence of an acid or alkali catalyst,
It is synthesized by adding water to a silane compound having a hydrolyzable group in a combined alcohol system, and when an equivalent amount or more of water is added to the silane compound having a hydrolyzable group, it is completely hydrolyzed. An alcoholic silica sol or silica sol/siloxane-based composite is obtained, and if less than an equivalent amount of water is added, a partial hydrolyzate corresponding to the ratio is prepared.

Among these silane compounds, especially the general formula (R'0) 38
i[08i(OR2)2] (OR3) (wherein, R1%
R" 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, as well as compounds obtained by hydrolyzing hydrolyzable groups.Among these, R1 to R3 each have the same or different carbon atom number 4.
Compounds represented by the following alkyl groups are preferred.

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 a copolymerizable a, β-ethylenically unsaturated monomer, according to conventional polymerization conditions.

The (meth)acrylic acid alkyl esters used in the present invention include, for example, acrylic acid methyl ester, acrylic acid ethyl ester, acrylic acid -〇-propyl ester, acrylic acid isopropyl ester, acrylic acid -
n-butyl ester, 2-ethylhexyl acrylate, decyl acrylate, methyl methacrylate, ethyl methacrylate, n-methacrylate
Examples include -propyl ester, isopropyl methacrylate, 〇-butyl methacrylate, 2-ethylhexyl methacrylate, decyl methacrylate, etc. Generally, the alkyl group has 1 to 1 carbon atoms.
20 acrylic acid alkyl esters and/or methacrylic acid alkyl esters in which the alkyl group has 1 to 20 carbon atoms are used.

Examples of the alkenylbenzenes used in the present invention include styrene, a-methylstyrene, and vinyltoluene.

In addition, when using a monomer mixture of alkenylbenzenes and (meth)acrylic acid alkyl esters, it is usually ) The proportion of the acrylic acid alkyl ester used is preferably 10% by weight or more.

Other copolymerizable α, β-ethylenically unsaturated monomers used to obtain the acrylic resin of the present invention include:
For example, α of acrylic acid, methacrylic acid, maleic acid, maleic anhydride, 7-malic acid, crotonic acid, itaconic acid, etc.
β-Ethylenically unsaturated carboxylic acids; α such as ethylene sulfonic acid.

β-ethylenically unsaturated sulfonic acids; 2-acrylamido-2-methylpropanoic acid; α,β-ethylenically unsaturated phosphonic acids; acrylonitriles; acrylamides; acrylic acid or methacrylic acid esters; acrylic Glycidyl esters of acid or methacrylic acid; examples include 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 0.1 to 10% of the total amount of monomers charged.
Used in a range of % by weight.

Acrylic resins can be produced by any polymerization method such as bulk polymerization, solution polymerization, suspension polymerization, and 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. Silane compound [A]
If the proportion of acrylic resin [B] exceeds the above range, the formed film will become brittle and have poor adhesion to the base material, making it easy to peel off, which is undesirable. If it is more than that, the effects of weather resistance and dustproofing properties will not be significantly exhibited, which is not preferable. Especially within the above range, [AI to [E3] is 15:1 to 1:10
It is preferable that it is in the range of .

A liquid dispersion medium may be further added to the above composition as required. Examples of 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
It is preferable to decide by taking into consideration the dispersion stability of the coating composition, the wettability after coating on the film surface, the difficulty of removing the liquid dispersion medium, and economic efficiency.

The above composition may further contain small amounts of acid or alkaline antifoaming agents, surfactants, lubricants, antistatic agents, plasticizers,
Commonly used additives such as antioxidants, ultraviolet absorbers, light stabilizers, film forming aids, thickeners, fungicides, algaecides, pigments, pigment dispersants, non-fi fillers, etc. can be mixed. .

Various known methods can be applied 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, dip coating method, spray coating method, bar code method, etc.
Any method known per se such as a knife coating method 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 coating coated with the above coating composition is formed on the surface of a soft 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 resistance 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℃, and the time is 10 seconds to
It is best to choose a 60 minute opening.

The amount of coating formed on the surface of the soft vinyl chloride resin film through heat treatment is 0.1 to 10 g/tn.
It is preferable to set it as the range of 2. 0. If it is less than 112 Ig/l, the effect of preventing the plasticizer from migrating to the surface of the soft vinyl chloride resin film is insufficient. Also, 10g
If it is /ra2 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, usually 0.5g/LI+2-7g
The range of /+a2 is most preferred.

In addition, before coating with the above-mentioned coating composition, the surface of the soft vinyl chloride resin film is preliminarily washed with alcohol or water, subjected to plasma discharge treatment or corona discharge treatment, or undercoated with other paint or brimer. 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, if the coating is formed on only one side, the horse mackerel will consider the side with the coating to be the outside of the greenhouse or tunnel. Use it as you see fit.

[Function] The agricultural vinyl chloride resin film according to the present invention has a coating coated with a specific coating composition formed on its surface, and this coating prevents oozing of various resin additives blended into the film. Even if the film is stretched outdoors for a long time, there will be little surface contamination and little decrease in light transmittance. This coating also has excellent flexibility and adhesion.

In addition, the base film may contain organic phosphate ester and/or
i Because it contains IJ acid metal salt, it has a high elongation retention rate and excellent durability.

“Examples” The present invention will be explained in detail based on Examples below.
The present invention is not limited to the following examples unless they exceed the scope of the invention.

Examples 1 to 6, Comparative Examples 1 to 5 Preparation of base film Polyvinyl chloride (P=1400) 100 parts by weight Nooctyl 7 tallate 50 Ebico) 82
8 (Epoxy compound, trade name manufactured by Shell, USA) 1〃Ba/Zn
Composite stabilizer 1.5 Barium stearate (stabilizer) 0.2 // Zinc stearate
0.4 Sorbitan monolaurate 1
．． A resin composition consisting of 5 was prepared, and organic phosphate esters and/or organic phosphate metal salts of types and amounts shown in Table 2 were blended. However, in Comparative Examples (1, 2), it was not blended.

Each formulation was stirred for 10 minutes using a super mixer and then kneaded on a mill roll heated to 180°C to prepare a base film having a thickness of 0.15+++I11.

Production Example of Acrylic Shaft 4 Into a reactor equipped with a thermometer, a stirrer, a reflux condenser, and a nozzle for adding raw materials, add 100 parts by weight of isopropyl alcohol, 1.0 parts by weight of benzoyl peroxide, and the ingredients listed in Table 1. 100 parts by weight of the mixture of each monomer shown above was charged, and the reaction was continued at 80°C for 3 hours while stirring in a nitrogen gas stream. Furthermore, 0.5 parts by weight of benzoyl peroxide was added, and the reaction was continued for about 3 hours at the same temperature. Continuing, acrylic resin ADD was obtained.

1 Return 911 (A coating composition was obtained by blending a silane compound and an acrylic resin in the type and amount shown in Table 2, and adding isopropyl alcohol so that the solid content was 20% by weight.

However, in Comparative Example 1, no silane compound was blended. Furthermore, in Comparative Example 2, no acrylic resin was blended.

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 held in an oven at 130°C for 3 minutes to volatilize the solvent and at the same time heat-treated.

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 28/M2.

Sco J! Tetravalent - The performance of the film was evaluated in the following manner and the results are shown in Table 2.

(2) Flexibility of coating Each film was cut into pieces 5 cm wide and 15 cm long, and folded back alternately at intervals of 2c+n in a direction perpendicular to the length direction. In this state, apply a load of 2 kg from above, and
It was left in a constant temperature bath maintained at 5°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.

Δ...Cracks are observed in the coating at the creases.

X: Cracks are clearly observed in the coating at the creases.

■ Outdoor expansion test Eleven types of films were installed in a roof-shaped house (width: 3-1, depth: 5 m) in a test field in Shigun, Mie Prefecture.

From April 1985 to 1986, the house was coated with a ridge height of 1.5 gloss and a roof slope of 30 degrees, with the coated side facing outside the house.
A 2-year extended examination was conducted until March 2017.

The stretched film was subjected to an external appearance test and the elongation retention rate of the film was measured by the following method, and the dust resistance of the film during the stretching test was evaluated.

Appearance of film: 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.

Δ: Significant changes in appearance such as discoloration are observed.

X: Discoloration is observed on the entire surface.

Elongation retention rate of film...means a value calculated by the following formula.

Dustproof property: means a value calculated using the following formula.

Direct light transmittance at the actual wavelength of 555I11μ (manufactured by Hitachi Seisakusho, EPS-2U model used) The measurement results were displayed as follows.

◎...The light transmittance after stretching is 90% or more of that before stretching.

O...The light transmittance after expansion is in the range of 70 to 89% of that before expansion.

Δ...The light transmittance after expansion is in the range of 50 to 69% of that before expansion.

×: The light transmittance after stretching is less than 50% of that before stretching.

"Effects of the Invention" As is clear from the Examples above, the present invention has the following effects, and its agricultural utility value is extremely large.

(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 visible.
The coating is difficult to peel off and can withstand long-term use.

Patent applicant: Mitsubishi Kasei Vinyl Co., Ltd.

Claims (2)

[Claims] (1) A silane compound [A] having a hydrolyzable group directly bonded to a silicon atom and acrylic acid or A monomer selected from alkyl esters of methacrylic acid (hereinafter referred to as (meth)acrylic acid alkyl esters), or a mixture of this and an alkenylbenzene monomer, and copolymerizable α, β - A film whose main component is an acrylic resin [B] obtained by polymerizing with an ethylenically unsaturated monomer,
Agricultural vinyl chloride resin film formed under heat treatment. (2) The silane compound [A] has the general formula (R^1O)_3
Si[OSi(OR^2)_z]_n(OR^3) (wherein R^1 to R^3 are each the same or different alkyl group, aryl group, alkylaryl group, arylalkyl group, aryl group, oxyalkyl group or alkyloxyalkyl group, n represents 0 or a positive integer), and obtained by hydrolyzing a hydrolyzable group. The agricultural vinyl chloride resin film according to claim 1, which is a compound.