JPS62173250A - Agricultural laminated film - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to an agricultural laminated film with good transparency and durability. More specifically, it has excellent transparency, weather resistance, anti-fogging properties, house adhesion, dust proofing, workability for spreading, and workability for opening and closing during ventilation, as well as being economical, with good transparency and long-lasting Ik.
For commercial laminated film.

``Prior art 1: As agricultural films, flexible polyvinyl chloride film, ethylene-vinyl acetate jt [combined film/rem, polyethylene film, etc.] are commonly used, but ethylene-vinyl acetate copolymer film, Polyethylene film has poor weather resistance and deteriorates in 2.3 months in the summer when UV rays are strong, so it is mostly used for films for agricultural greenhouses, which have various types that maintain strength and transparency for a relatively long period of time. However, even this flexible polyvinyl chloride film with excellent weather resistance loses its transparency after being used for agricultural purposes for more than a year. In most agricultural greenhouses, the film is replaced every year, and the labor and material costs required for replacement are large.The reasons for this are as follows: Soft polyvinyl chloride film contains a large amount of plasticizers and various additives such as water drop proofing agents, stabilizers, etc. During use, these plasticizers, etc. stand out on the surface of the film, causing dust to accumulate there. As a result, light transmittance decreases and weather resistance tends to be adversely affected.As a way to improve these defects, specific plasticizer extrusion prevention substances and specific substance transfer to polyvinyl chloride resin have been proposed. Defense 1
A method has been proposed for forming a coating film for

The method of making a film by blending a plasticizer extrusion prevention substance with a polychloride resin is not only affected by the properties of the specific substance to be blended, but also requires a large amount to be blended in order to obtain the desired effect. However, if the amount is too large, the physical properties of the film may be seriously deteriorated.

On the other hand, the method of forming a coating film on the surface of a soft polyvinyl chloride film is to apply a coating material to the film or to form a coating film by scattering a solvent. However, it was not possible to dramatically improve the deterioration in durability, weather resistance, and light transmittance.

[Problems to be Solved by the Invention] The gist of the present invention is to create a transparent resin in which a hard or semi-hard vinyl chloride resin is laminated on a soft vinyl chloride resin with a synthetic resin layer interposed therebetween to prevent migration of plasticizer. Concerning an agricultural laminated film with good sustainability.

The present invention will be explained in more detail below.

The agricultural laminated film of the present invention is composed of three layers. One surface layer (forming the outer surface of the house) is made of a hard material with good stain resistance (dust resistance), slipperiness (workability), and weather resistance. Alternatively, a semi-hard vinyl chloride resin film is used, and the inner surface i (forming the inner surface of the house) is a soft vinyl chloride resin film that constitutes the base layer of the agricultural laminated film of the present invention. Rigid or semi-rigid vinyl chloride resin film is one that does not contain any plasticizer or contains 20 parts or less of plasticizer per 100 parts of vinyl chloride resin, and if necessary, stabilizers. lubricant, ultraviolet absorber,
It is a film made of a composition containing processing aids and other additives. Soft vinyl chloride resin film is a film consisting of a composition whose main components are vinyl chloride resin, plasticizer, and stabilizer, and optionally contains antifogging agents, ultraviolet absorbers, antioxidants, and processing aids. In addition to this, various resin additives such as a heat retention improver, a mold-proofing agent, an algae-proofing agent, and a coloring agent may be included.

In the present invention, vinyl chloride j1% +34 resin includes not only polyvinyl chloride but also copolymers containing vinyl chloride as a main component. The three single chambers that can be copolymerized with vinyl chloride resin include vinylidene chloride, ethylene, propylene, acrylonitrile, vinyl acetate, maleic acid, itaconic acid, acrylic acid, acrylic esters, methacrylic acid, and methacrylic ester M. '''9. Vinyl chloride resin may be used alone or as a mixture of two or more types. Vinyl chloride resin can be produced using suspension polymerization, emulsion polymerization, or emulsion-suspension polymerization. The degree of polymerization of the rigid or semi-rigid vinyl chloride resin, which may be manufactured by any conventionally known manufacturing method such as solution polymerization method or bulk polymerization method, should be selected within the range of 500 to 1000. is preferable; if it is less than 500, the mechanical properties will be weak and cracks will occur in the layer, and ioo.

If it is too hot, the resin will burn, which is undesirable.

The degree of polymerization of the vinyl chloride resin of the soft vinyl chloride resin film can be selected within the range of 800 to 2,500.

Examples of the plasticizer used in the present invention include the following.

7-talic acid plasticizer - no-low octyl phthalate, di-2-ethylhexyl 7-talate, twinzyl 7-thale, twindecyl 7-thale, didodecyl 7-thale,
Isophthalic acid plasticizers such as noundecyl 7-thalerate - 7-dipic acid plasticizers such as diisooctylin 7-thalerate - Dioctyl 7novate-maleic acid plasticizers - Norobyl maleate 19-cycitric acid plasticizers - Tri-11-butyl Itafonic acid plasticizers such as citrate - Oleic acid plasticizers such as cefitaconate - Sun/-oleic acid plasticizers such as butyl oleate
- Epoxy plasticizers such as glycerin molysil/late - Epoxidized oil, epoxidized linseed oil, epoxidized fish oil, epoxidized tall oil fatty acid ester, epoxidized middle fat oil, epoxidized polybutanoene, epoxy methyl stearate, epoxy Butyl stearate, 2-ethylhexyl epoxy stearate,
Stearyl epoxy stearate, tris(epoxyprobyl) incyanurate, epoxidized castor oil, epoxidized 7-laurel oil, epoxidized linseed oil fatty acid ester, 3-(2-xe-7quin)-1,2-epoxypropane, Bisphenol-A diglycinol ether, vinylcyclohexene oxide, 2,2-bis(4-
Phosphate-based plasticizers such as polycondensation products of (hydroxyphenyl)propane and epichlorohydrin - trioctyl phosphate, triphenyl phosphate, tricylenyl phosphate,
Diphenyloctyl phosphate 7x-to, 7-enyl cresyl phosphate, triethylphenyl phosphate, and the like.

These plasticizers may be used alone or in combination of two or more. For soft vinyl chloride resin films, the blending amount of these plasticizers is 30 to 100 parts by weight per 100 parts by weight of vinyl chloride resin in order to balance flexibility and strength.
a vehicle weight part, preferably from a range of 35 to 70 parts by weight;
Buko is preferable.

Semi-rigid vinyl chloride? 4 (For greasy films, the content is limited to 20% by weight or less. If it exceeds 20 parts by weight, the stain prevention effect is insufficient, so it is not preferable. However, especially for epoxy plasticizers, vinyl chloride resin 100% Preferably, the amount is 0.7' parts per part by weight.

As the antifogging agent used in the present invention, any surfactant that can impart antifogging properties to a soft vinyl chloride film can be used.

For example, polyhydric alcohols such as sorbitol, mannitol, glycerin, polyglycerin, pentaerythritol, trimethylolpropane, and carbon atoms ranging from 10 to 22
Examples include nonionic surfactants derived from fatty acids, or nonionic surfactants derived from -11 polyhydric alcohols, fatty acids, and flukylene oxide.

The fatty acid having 10 to 22 carbon atoms may be either a straight chain or a branched chain fatty acid. Specifically, lauric acid,
In addition to fatty acids such as myristic acid, valmitic acid, stearic acid, isostearic acid, behenic acid, and oleic acid, beef tallow, type 1 oil, corn oil, and fattening oil.

Examples include fatty acids obtained from oil, cottonseed oil, balm oil, sesame oil, linseed oil, or hydrogenated oils thereof, and mixed fatty acids thereof.

Examples of alkylene oxides include ethylene oxide, propylene oxide, butylene oxide, and phenylene oxide.4Additionally, alkylene oxide may be added by adding fullylene oxide to a polyhydric alcohol and then esterifying it with a fatty acid. Alkylene oxide may be added after esterifying polyhydric alcohols and fatty acids. Furthermore, a double alkylene oxide may be added.

The blending amount of these antifogging agents is vinyl chloride resin 1° (]00
1 to 5 parts by weight is good.

Other i1 components can be added to the hard, semi-hard and soft vinyl chloride resin films according to the present invention, if necessary. For example, lubricant, heat stabilizer, antioxidant 1]
- When used in combination with various additives such as -shavings, ultraviolet absorbers, antistatic 1 (-shavings, stabilizing agents, fungicides, algaecides, colorants, etc.), the interlayer χ1 can be 7. Examples of lubricants and heat stabilizers that can be used include polyethylene wax, paraffin, stearic acid, zinc stearate, fatty alcohols, Calcium stearate, barium stearate, barium 7-lysylate, butyltin malate, butyltin malate,
Examples include phenols and β-nogaton compounds.

These lubricants and heat stabilizers can be used alone or in combination.

Compounds that can be used as antioxidants include 2.6-
Not-tert-butyl-4-methyl 7 eth/-ol, 2.2
'-/tyrenebis(6-Lert-butyl-4-ethylphenol), dilaurylthiodipropionate, and the like. These antioxidants 111 can be used alone or in combination of two types.

Examples of compounds that can be used as ultraviolet absorbers in the present invention include the following.

Benzotriazole UV absorber-2-(2゛-hydroxy-3',5'-di-tcrt-butylphenyl>
-5-chlorobenzotriazole, 2-(2'-hydroxy-3'Lert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3'-terL-7mil-5 '-1butylphenyl)-5-chlorobenzotriazole, 2-(2
'-Hydroxy-3'-isobutyl-5'-methylphenyl)-5-chlorobenzo[lyazole, 2-(2'-
Hydroxy-3゜-isobutyl-5''-propylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-diterL-butylphenyl)benzotriazole, 2-(2'-hydroxy -5'-methylphenyl)benzotriazole, 212'-hydroxy-5'(1,1,3,3-tetramethyl)phenyl)benzotrifl/-.

Benzo7ene-based ultraviolet absorber -2,2°-nohydroxy-4-nodoxybenzophene, 2゜2゛-nohydroxy-4,4°-dimethoxybenzo7ene, 2.2'
, 4.4°-tetrahydroxybenzo-7enone, 2-hydroxy-4-methoxybenzo-7enone, 2,4-dihydroxybenzo-7enone, 2-hydroxy-4-octoxybenzo-7enone, etc. .

Salicylic acid-based ultraviolet absorbers - 6 ultraviolet absorbers such as 7enyl salicylate and paraoctyl 7enyl salicylate can be used alone or in combination of 2N or more.

Among those exemplified in (H), benzotriazole-based ultraviolet absorbers and benzo-7ene/ene-based ultraviolet absorbers are particularly preferred, and the blending amount is 0.5% per 100 parts of vinyl chloride resin.
1 to 3 parts by weight is preferred.

Antistatic: Examples of compounds that can be used as a scratching material include polyoxyethylene alkylamine, polycryfur ether, and sodium p-styrenesulfonate. These belt 1 and protection 11 agents can be used alone or in combination of two or more.

Compounds that can be used as stabilizing aids include triphenyl phosphite, nooctylphenyl phosphite,
)'J(/nylphenyl) phosphite, diphenylisodecyl phosphite, trilauryltrithiophosphite, diphenyl acindophos heptaite, dioctyl acid phosphite, and the like. These stabilizing aids can be used alone or in combination of two or more.

Compounds that can be used as fungicides and algaecides include 2.
, 4.5.6-titrachloroin 7-talonitrile, 10
．． 10'-oxybis7ヱ7kinarunn, 2-(4-
thiazolyl)-benzimiguzole, N(fluoronechloromethylthio)7talimide, N-dimethyl-N'-
722-ru(N'-70logikkuchiruthio)sulfamide, baraoki cybenzoic acid ester, 5-promo-5-nitro-1,3-dioxane, 2,3,5.6-tetrachloro-4- Examples include methylsulfonylpyridine, 3-methyl-4-chlorophenol, N(tetrachloroethylthio)7talimide, and tributyltin laurate. These compounds can be used alone or in combination. Examples of those that can be used as coloring agents include phthalonine blue,
Phthalocyanine green, Hansa yellow, acrylic, titanium oxide, 111; lead flower, permanent red,
Examples include quinacridone and carbon black. These colorants can also be used alone or in combination of 2FI+ and 1-.

It is preferable to use the various resin additives described in I- below within a range that does not deteriorate the properties of the film, usually within a range of 5 yen if 1 part or less per 100 parts by weight of the vinyl chloride resin.

To mix the plasticizer, antifogging agent, and other resin additives with the vinyl chloride resin, weigh out the required amount of each, and use a ribbon blender,
Super mixers and other conventionally known mixers may be used.

In order to use the thus obtained O(fat composition) as the hard, semi-hard and soft vinyl chloride resin layer of the present invention, the resin composition of I- is cooled and dried so as not to form lumps. Either use it as a dry blend, or knead it in a known kneading machine such as a Banbury mixer, conigure mill, etc., and use it as a powder or shredded solid (pellets, chips). It is better to use this method.

In the present invention, in order to form a synthetic resin layer that prevents the soft vinyl chloride resin film from swelling into the hard or semi-hard vinyl chloride resin film, it is necessary to Or, it must have good adhesion to semi-rigid vinyl chloride resin film and be able to prevent plasticizer migration, and acrylic resin,
Ethylene-vinyl acetate copolymer resin, ethylene-ethyl acrylate copolymer resin 0 (there are fats, polyurethane resins, etc.)
Among these, ethylene-vinyl acetate copolymer resin or ethylene-ethyl acrylate copolymer resin is preferred from the viewpoint of moldability and economical efficiency. It seems that the object of the present invention can be achieved by simply laminating a soft vinyl chloride resin film and a hard vinyl chloride resin film, but in that case, good results are shown immediately after lamination, but over time the soft The plasticizer in the vinyl chloride resin film transfers to the hard vinyl chloride resin film, which retains the drawbacks of the conventional soft vinyl chloride fruit film. <6411
A synthetic resin layer is essential between the ff film and the plasticizer to prevent migration of the plasticizer.

The ethylene-vinyl acetate copolymer used for the synthetic resin layer in the present invention is a copolymer of ethylene and vinyl acetate obtained by lanocal polymerization under high pressure, and has a vinyl acetate content concentration of 15 to 35 polymers. A%, preferably 19 to 28% by weight. If the vinyl acetate content concentration is less than 15 tonne weight, the interlayer γ1 strength with the vinyl chloride resin film is weak and there is a practical time limit, and if the vinyl acetate content exceeds 35 weight percent, the melt viscosity is low and the moldability is poor. Since it is inferior in quality, it cannot be recommended.

The ethylene-ethyl acrylate copolymer is a copolymer of ethylene and ethyl acrylate, and the ethyl acrylate content concentration is 5 to 30%, preferably 10 to 30%.
It is preferable that the ethyl acrylate concentration is 51 rL volume %, and the ethyl acrylate content concentration is 51 rL volume %. If it exceeds % by weight, the melt viscosity is low and the moldability is poor, so it is not recommended.

The agricultural laminated film of the present invention can be manufactured according to a conventional method. For example, by inflation molding or T-die molding, the so-called co-extrusion method in which each film (fat) is fed from separate extruders into one die and laminated and integrated inside or outside the die. For example, apply polyethyleneimine or incyanate 0 (grease, etc.), pass it through a drying oven to evaporate the solvent, dry it, put the film to be pasted on 1-, and laminate it by pressing under a pressure of λ~. Method: Extrude polyolefin (+) (fat) into a film using the T-die method.While the film is still in a molten state, it is allowed to flow onto another film 1- coated with CC adhesive if necessary, and immediately passed between the rolls at 11
L relaminate to let TI pass? ! ! j'a
For example, how to do this.

In the laminate molding method, two or more types of films or sheets are first formed by calendering, extrusion, etc., and then laminated, which lengthens the process and increases production costs. The laminating method that uses JF&A has problems such as contamination of the working environment because the JF&A medium used during cutting is exposed to the atmosphere.

Furthermore, it is difficult to apply adhesive evenly on films or sheets with high elongation, which tends to cause bubbles, wrinkles, etc., and also tends to cause soybeans with weak adhesion between each layer, so coextrusion is used to mold them into one piece. It is most preferable to do so.

Among these methods, a method in which a flat sheet or portrait is coextruded using a composite T-die or a composite cylindrical die, taken up by a conventional method, and further heat-treated as necessary improves interlayer adhesion and productivity. This is the most desirable method for

"Effects of the Invention" The agricultural film of the present invention can be used as explained below!
-It exhibits excellent effects and its utility value is extremely large.

The agricultural film of the present invention has a surface layer made of a hard or semi-hard polyvinyl chloride film, an inner layer made of a soft polyvinyl chloride film, and a synthetic resin layer between the two layers to prevent migration of plasticizer. Therefore, the hard and semi-hard polyvinyl chloride film surfaces are not affected by plasticizer migration from the soft polyvinyl chloride film, and even if the film surface becomes dirty, it can be easily washed away. In addition, when this film is used as a cover for IA length tunnels or greenhouses, it exhibits the good light transmittance, weather resistance, and light resistance of the rigid or semi-rigid polyvinyl chloride film.
It is an economical film that provides excellent effects and can be used for a long period of time.

[Example I 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.

Example 1 Beret) A Soft vinyl chloride resin composition Polyvinyl chloride (P='1300) 100 parts by weight 7 Talic acid based plastic cutting (DOP Nidi-2-ethylhexyl 7 Talley)
, 45 @ FI Mr phosphate ester plasticizer (TCP: triphrenor phosphate) 5 Epoxy compound (epicchlorohydrin-bisphenol A condensate) 2 Stabilizer (barium-zinc composite stabilizer) 1,5 //(Baritum stearate) 0.5.

(Zinc stearate) o, S.

Ethylene bisstealloy) 0,5//Anti-fog grinding (sorbitan monostearate) 3 Ultraviolet 1fA
＠Harvesting<2-(2'-Hydroxy-5'-methylphenyl)penztriazole)0,1//1-The following 0 components were mixed in a Henschel mixer and subjected to cold JJI.
The mixture was kneaded using Funig (manufactured by Bu-+s) and extruded at a temperature of 170''C to form a pellet Δ.

Beret B Ethylene-vinyl acetate Jt+ m combination (&
(F: ■Δ, commercial product) Vinyl acetate content concentration 28%
, EVA with melt index 7 g/10 min
A beret was used.

Beret C ethylene-ethyl acrylate co-merger (EE
Δ, commercial product) containing ethyl acrylate (f concentration 18% by weight,
A pellet to EE with a melt index of 6 H/10 min was used.

Beret D Hard or semi-hard vinyl chloride resin composition Polyvinyl chloride (I5=800) 10 (1 coulometric part 7 Talic acid plasticizer (1') OP) Variable
Quantity: Organic tin malate 3 Organic laurate 0.5 Epoxy, oil 3 Ultraviolet absorber (same as pellet 8) 0.1 // The composition in I- was mixed in a Henschel mixer and cooled. ugly (13 uss
17 (') "C's t"
It was extruded under the conditions of J-degree to obtain pellet D.

Use Beret 8 with 65φ extrusion, Berrenoto B or Beret C with 40φ push 71i + fi, Beret D
The 40φ extrusion is extruded at /7180'C using
A molten film consisting of three layers is obtained by supplying it to a T-die for three-layer coextrusion, and the film is brought into close proximity to the die.3 Once it is, it is guided to a casting roll 1- at 50°C and cooled, then julled. L, soft polyvinyl chloride film 80μ
, ethylene-acid-resistant vinyl Jli1F body film It4
Also 1. T-ethylene ethylene-ethyl acrylate film layer 13μ
An iJ lt,1 (10rnrn R1 layer film was obtained) consisting of 7μ of a rigid or semi-rigid polyvinyl chloride film layer.

Comparative Example 1 The plasticizer Hy of Beret D in Example] was 30i7'
A laminated film was obtained under all the same conditions as in Example 1, except that a pellet containing i i'1+,' parts was used.

Comparative Example 2 A laminated film was prepared under the same conditions as in Example 1 except that Beret) A was used instead of Beret) B or Beret y) C in Example 1.

Comparative Example 3 Commercially available agricultural vinyl chloride (→4111f film (S-
PVC, 1) 41r1100μ) and [/'llr: t
',' Single Jg of J engineering + Renfilm (agricultural polyester, wall thickness 100μ)? + Film was used.

Laminated film and! The following time-opening properties of the ItrX4 film were investigated.

Dustproof> The test film was installed in a pipe house in a test field in Shigun, Mie Prefecture.
Rigid and semi-rigid vinyl chloride (M, roof slope 30 degrees)
lj (The oil film surface was placed on the outside of the house, and a stretching test was conducted for one year from February 1980 to February 1986.6 The film after the stretching test was collected, and the wavelength was 555 microns and 17 microns. The light transmission +4< was measured using a spectrophotometer (manufactured by Ichiri Seisakusho, model EP S-2tJ).The measurement results were displayed as follows.

◎...Light transmittance is 80% or more 1-0...Light transmittance is in the range of 65・'X,,79%Δ...Light transmittance is in the range of 45-64%× ...Light transmittance of less than 45% Writing quality> Judgment was made based on ease of handling when extending the laminated film into a tunnel or greenhouse.

0... Not sticky and easy to work with △... Slightly sticky and difficult to work with ×... Strongly sticky and difficult to work <Anti-fog properties 〉 Test 9. Film: Towards the south side of the test field in Tun County-Shibe! It was installed in a single-roofed house in October 1959, and about 7 months later, in May 1960, K was attached to the inside surface.
I L r Kosui 71yl observation of the situation with the naked eye 6 Inkstone 7
The results are shown below.7 C)...Water is deposited in a film with almost no water droplets 0...Water is deposited in a film with γ1, but there is a slight amount of water droplets. ζ
Films with adhesion of water droplets △... Areas with small water droplets adhering to them ×... Films with small water droplets adhering to the entire film House adhesion > House or tunnel When the IF layer film was stretched to 7 frames, the tension of the film was determined.

○...There is a gap between the frame and the film <, physically there are no walnuts or wrinkles Δ...7 There is a slight gap between the frame and the film, and there are walnuts or wrinkles here and there ×... 7 There is a gap between the frame and the film, the overall tension is poor, and there are many walnuts and wrinkles <Weather resistance>: Take the sample film outdoors in City Prefecture and Shigun, facing south, and with a light on the ground. The film was exposed to a protruding platform inclined at 45 degrees from February 1980 to February 1986, and the change in appearance of each film was visually evaluated. [Evaluation results of weather resistance 1 have the following meanings.

O... No change Δ... Brown spots are observed ×... Browning over the entire surface <Transparency> Visually evaluate the transparency of the obtained product R film as 1゛1
Established.

0...Transparent △・・・Slightly cloudy ×・　・　・Muddy The temperature characteristics were investigated and the results are shown in Table 1.

Example 2 Instead of beret) B in Example 1, LFF [EVA berets with different vinyl content concentrations were used, and in place of beret) C, EE with different ethyl acrylate content concentrations was used.
A laminated film was made under the same conditions as in Example 1, except for using pellet A, and the six results of examining each characteristic are shown in Table 2.
Shown below.

Table 2 Example 3 No. 1 of Belev) A and Belev) D used in Example 1
was extruded at 180°C using a 40φ extrusion mill, and a pellet of ethylene-vinyl acetate copolymer with a vinyl acetate content concentration and a pellet of ethylene-ethyl acrylate with a different concentration of ethyl acrylate were extruded using a 20φ extrusion mill. te1
It was extruded at 80° C. and fed to a composite T-die for two-layer coextrusion to form a sheet composed of two layers with each resin layer having a thickness of 300 μm. The interlayer adhesive strength between each resin layer of the thus obtained laminated sheet was measured by T-peeling. For the measurement, an Autograph TM-10 (type 1 manufactured by Shima Ritsu Seisakusho Co., Ltd.) was used. The results are shown in Tables 3 and 4.

Table 3 Peel strength unit (H/1 (1 time)) Table 4 Migration test 1 Benz) A used in Example 1 and pellet B of ethylene-vinyl acetate copolymer containing 28% vinyl acetate, 18
Vere 7) C of ethylene-ethyl acrylate copolymer containing ethyl acrylate in weight% was extruded at 180'C using a 40φ extruder, and fed to a single M4T die.
Benz) A 100μ, Beret B or Beret C 2
An lj layer film of 0μ;) type was obtained.

Each film was cut into l Oc+n pressure, γi,
Each film was brought into close contact.

A polystyrene sheet with a thickness of 0 and 5111+Q was attached to the film surface of pellet B or pellet C with a film density of χ1 and r 2/ζ4, and in this state a 2 kg cart was placed in a constant temperature oven maintained at 50 °C. After that, it was left to stand for 7 days, and then taken out from the thermostatic oven, the cart was removed, and the polystyrene sheet was peeled off, and the weight of each sheet was measured.

The results are shown in Table 4.

The smaller the weight measurement value, the less the transfer of plasticizer etc. from the sheet surface.

Migration test 2 Fi 0 was applied to the monolayer film of Benz) A obtained in migration test 1.
．． The test was conducted under the same conditions as in Migration Test 1, except that the polystyrene sheet of 5■ was made denser than χ1, and the results are shown in Table 5.

Table 5 Applicant: Go, Ryokasei Vinyl Co., Ltd. Representative PP Patent Attorney Atsuya - (1 idiot) Procedural amendment February 27, 1986

Claims (3)

[Claims] (1) A synthetic resin that prevents the plasticizer in the hard vinyl chloride resin film from migrating to the hard or semi-hard vinyl chloride resin film. Agricultural laminated film made by laminating layers. (2) The synthetic resin that prevents the plasticizer in the soft vinyl chloride resin film from migrating to the hard or semi-hard vinyl chloride resin has a vinyl acetate concentration of 15 to 35% by weight.
The agricultural laminate according to claim 1, which is an ethylene-vinyl acetate copolymer resin and/or an ethylene-ethyl acrylate copolymer resin having an ethyl acrylate content concentration of 5 to 30% by weight. film. (3) The agricultural laminated film according to claim 1 or 2, wherein the laminated film is laminated by a three-layer die coextrusion method.