JPS6116950A - Vinyl chloride resin film for agriculture - Google Patents

Abstract

PURPOSE:A film having improved freeze resistance, not causing trears resulting from folded wrinkle and scratches, obtained by blending a specific vinyl chloride resin with a phthalic ester plasticizer, a phosphoric ester plasticizer, and an epoxidized plasticizer, and making the blend into a film. CONSTITUTION:(A) 100pts.wt. vinyl chloride resin having 1,500-2,500 average polymeization degree is blended with (B) 30-70pst.wt. phthalic ester plasticizer, (C) 1-7pts.wt. phosphoric ester plasticizer, and (D) 0.5-7pts.wt. epoxidized plasticizer in such a way that total amounts of the components A+B+C are 40-80pts.wt., a weight ratio of the component A/B is 1:1/5-1/35, and a weight ratio of the component A/C is 1/10-1/100. The thickness of the film is 0.03- 0.3mm., preferably 0.05-0.2mm..

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a vinyl chloride resin film for agricultural use. More specifically, the present invention relates to a soft vinyl chloride resin film for agricultural use that has excellent cold resistance, is resistant to tearing due to creases and scratches, and has excellent weather resistance.

"Conventional technology" In recent years, farmers cultivating useful plants have begun to widely adopt methods of promoting or suppressing cultivation of useful plants in greenhouses or tunnels in order to improve profitability. Became.

The materials used to cover this house or tunnel include polyethylene film, ethylene-hinyl acetate Jt4 composite film, and vinyl chloride! Resin films, etc. are used. Among them, vinyl chloride resin films have better light transmittance, heat retention, and mechanical strength compared to other synthetic resin films.

It is widely used because it has the best overall durability, workability, economy, etc. However.

Conventionally, soft films made of vinyl chloride resin are used.

It is easy to get wrinkled and scratched, and this causes the problem that it can be torn while being expanded into a house.

To spread a film over a greenhouse for cultivating useful plants, first, a long film with a width of 100α to θθm, cut to 16N, is adhesive-processed to match the shape and size of the greenhouse. Let's do it. The glued pieces are then folded into a kudzu-fold shape and, in some cases, squeezed using a squeezing machine to a size that can be carried around.After being stored, they are delivered to farmers. At the farm, they are kept folded until they are rolled out. Then, when using it, unfold the folded film and...
Place it over the cage frame and hold it down with a holding string such as a band wire to complete the expansion.

Even if the film is soft, wrinkles occur when the film is folded, and tears occur due to the wrinkles when the film is unfolded and placed over the frame of the house. Breakage of the film due to these fold wrinkles frequently occurs during stretching at low temperatures.

On the other hand, the surface of the film placed over the frame of the house may be scratched due to the tightening of the film presser string, ventilation work inside the house, etc., which may cause the film to tear. Film tearing caused by these scratches is also concentrated during low temperature periods.

As a measure to prevent the above-mentioned folding wrinkles, scratches, etc. from occurring in the film, increasing the amount of plasticizer blended has been taken.

However, the degree of polymerization that has been conventionally used as agricultural films is /θjθ~1iit.

For polyvinyl chloride of
The film can be improved to be softer and more flexible during the low profile period, and it can be improved so that it does not wrinkle during the low temperature period, but it becomes too soft at room temperature, and there is a new problem that the film surface becomes sticky. , so it is not a desirable solution.

"Problems to be Solved by the Invention" Under such circumstances, the present inventors have found that the film has excellent cold resistance and is less susceptible to tearing of the film due to creases and scratches.
The surface is less sticky.

The purpose of the present invention is to provide a flexible vinyl chloride resin film for agricultural use that has excellent weather resistance.

``An unsuccessful means to solve the problem'' However, the gist of the present invention is that the average degree of polymerization is /
! To 100 parts by weight of vinyl chloride resin of θo-Qx, to θ, (A) 30 to 70 parts by weight of phthalate ester plasticizer) 7 to 2 parts by weight of phosphate ester plasticizer (C)
An agricultural vinyl chloride resin film is characterized in that it contains 7 to 7 parts by weight of an epoxidized plasticizer O, S and is formed into a film.

The present invention will be explained in detail below.

In the present invention, the vinyl chloride resin refers to polyvinyl chloride, a copolymer mainly composed of vinyl chloride and a vinyl compound that can be copolymerized with the polyvinyl chloride.

Vinyl compounds that can be copolymerized with vinyl chloride include vinyl acetate, ethylene, propylene, vinylidene chloride, acrylic acid and its alkyl esters, methacrylic acid and its alkyl esters, maleic acid, fumaric acid, acrylonidril, etc. It will be done.

The above vinyl chloride resin has an average degree of polymerization of /60θ~2j
θθ. If the average degree of polymerization is less than /oθθ, the purpose of preventing the film from breaking due to creases and scratches cannot be achieved, so it is undesirable.
If it exceeds 2o θ0, the processability will be poor and it will be difficult to form a film, which is not preferable. Note that the vinyl chloride resin may be a mixture of two or more types having five different average polymerization degrees. In this case, the average degree of polymerization and the arithmetic mean value taking into account the proportions of each component should be in the range of /30θ to 000.1 All the average degrees of polymerization of the individual vinyl chloride resins must be within the above range. There isn't.

The film according to the present invention has the above-mentioned vinyl chloride resin (
A) A phthalate ester plasticizer is blended as the component.

Examples of phthalate ester plasticizers include dibutyl phthalate, diheptyl phthalate, di-n-octyl phthalate, diisooctyl phthalate, di-ethylhexyl phthalate, dinonyl phthalate, and diisononyl phthalate.

Examples include diisodecyl 7-thaleate, didodecyl phthalate, diundecyl phthalate, citridecyl phthalate), butylbenzyl phthalate, and the like.

These phthalate ester plasticizers that are component (A) are:
One type or a combination of two or more types may be blended, and the blending amount shall be selected within the range of 30 to 7θ parts by weight based on 100 parts by weight of the base vinyl chloride resin. 30
If the amount is less than 1 part by weight, the flexibility of the film will be poor, and the purpose of preventing the film from tearing due to creases and scratches will not be achieved, so it is not preferable. If it exceeds 70 parts by weight, the film becomes too flexible and does not have sufficient strength, which not only makes the film more likely to tear due to creases and scratches.

This is not preferable because the stickiness of the film surface becomes noticeable and the so-called "blocking" in which the film surfaces adhere to each other occurs. Within the above range, 90 to 30 parts by weight is particularly preferred.

The film according to the present invention includes (
A phosphate ester plasticizer as component B) is blended.

Phosphate ester plasticizers include trioctyl phosphate and triphenyl phosphate.

tricresyl phosphate), 11 xylenyl phosphate, diphenyl octyl phosphate, diphenyl cresyl phosphate),)! J ethyl phenyl phosphate, etc.

These phosphoric acid ester plasticizers, which are component (B), may be blended singly or in combination of two or more, and the blending amount is 7 to 2 parts by weight per 100 parts by weight of the base vinyl chloride resin. The selection shall be made within the scope of the section. It is less than 7 parts by weight.

This is not preferable because the surface weather properties of the film are not improved.
If the amount is more than 7 parts by weight, it is not preferable because cold resistance, film-forming workability, and blocking may occur.

Particularly preferred within the range indicated in ``2'' are /, parts by weight.

-7= The film according to the present invention has (
An epoxidized plasticizer as component C) is blended.

Epoxidized plasticizers include epoxidized soybean oil, epoxidized linseed oil, epoxidized fish oil, epoxidized tall oil fatty acid ester, epoxidized medium fat oil, epoxidized polybutadiene, epoxy methyl stearate, epoxy methyl stearate, and epoxy stearin. Acid-coethylhexyl, stearyl epoxystearate, tris(epoxypropane)in cyanurate.

Epoxidized castor oil, epoxidized flower oil.

Epoxidized linseed oil fatty acid ester, 3-t-xenoxy)-/, 2-epoxypropane, bisphenol A diglycidyl ether, vinylcyclohexene diepoxide, 2,2-bis(couhydroxyphenyl)
Examples include polycondensates of propane and epichlorohydrin.

The epoxidized plasticizer, component (C), may be blended singly or in combination of two or more.

The blending amount shall be selected within the range of 0.5 to 2 parts by weight based on 100 parts by weight of the base vinyl chloride resin. O
If it is less than 1S part by weight, the workability of film formation will be poor,
This is not preferable because it does not improve weather resistance, and if it is more than 2 parts by weight, it reduces cold.

This is not preferred because film formability is poor and "blocking" occurs. In the above range, θ,! ~! Parts by weight are particularly preferred.

The film according to the present invention includes the above (A), (B) and (
The three components of C) are selected within the above range of blending amounts and are always blended, but the total amount of these three components is selected within the range of 90 to 10 parts by weight per ioo parts by weight of the base vinyl chloride resin. shall be taken as a thing. When selected within this range, the film has excellent moldability and weather resistance.

It is possible to produce a film that is resistant to "blocking", has excellent cold resistance, and is resistant to tearing due to folding wrinkles and scratches. When combining the above three components, the ratio of component (A) to component (B) should be 1% by weight to /%.
It is particularly preferable that the ratio of component (A) to component (C) be 7 to //10 = 'Aθ0 at a weight ratio of 1.

In addition to the above three components, the agricultural vinyl chloride resin film according to the present invention contains an antifogging agent, an antistatic agent, an ultraviolet absorber,
Stabilizer, antioxidant, stabilizing aid, anti-mold agent, anti-algae agent 1
It may also contain various resin additives such as colorants.

Compounds that can be used as antifogging agents include sorbitan fatty acid ester, sorbitol fatty acid ester, diglycerin fatty acid ester, glycerin fatty acid ester, sorbitan fatty acid dibasic acid ester, sorbitol fatty acid dibasic acid ester, and diglycerin fatty acid dibasic acid ester. Basic acid ester, glycerin fatty acid/dibasic acid ester.

and compounds obtained by adding alkylene oxide such as ethylene oxide, propylene oxide, and butylene oxide to these.

Among such compounds, esters of carbonaceous acids, esters of 2 to 22 fatty acids, and esters of dibasic acids thereof are preferred.

Specific examples of these compounds include sorbitan palmitate, sorbitan stearate, 3 mole adduct of sorbitan stearate and ethylene oxide, 2 mole adduct of sorbitan palmitate and propylene oquinide, sorbitol stearate, sorbitol stearate, and ethylene oxide. 3 mole oxide adduct, diglycerin palmitate, diglycerin stearate, glycerin stearate, glycerin palmitate/ethylene oxide-mole adduct, sorbitan stearate adipate 1 mole propylene oxide adduct, sorbitol stearate adipate Examples include an adduct of 3 moles of ethylene oxide and 3 moles of propylene oxide, an adduct of 2 moles of diglycerin palmitate and sebacate and propylene oxide, and an adduct of 3 moles of sorbitol palmitate and adipate and propylene oxide. These specific examples are not intended to limit the invention. These antifogging agents can be used alone or in combination of two or more.

Compounds that can be used as antistatic agents include:

For example, polyoxyethylene alkylamine.

Examples include polyglycol, ether, and sodium lp-styrene sulfonate. These antistatic agents can be used alone or in combination of two or more.

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

Benzotriazole-based ultraviolet absorber □-1(2/-hydroxy-3',tart-butylphenyl)-j-chlorobenztriazole.

Co(,2'-hydroxy-3'-tθrt-butyl-
! '-Methylphenyl)-ochlorobenzotriazole, :z-(2'-hydroxy-3'-tθrtrolobensotriazole% λ-(2'-hydroxy-3'
-isobutyl-! '-methylphenyl)-ochlorobenzotriazole, λ-(-'-hydroxy-3'-isobutyl-j'-propylphenyl)-ochlorobenzotriazole, -! -(7!'-Hydroxy-3/,
J-L-di-tert-butylphenyl)penztriazole, 2 (2r-hydroxyo'-methylphenyl)penztriazole% 2-[hydroxyo'-(/, /.

3.3-Tetramethylbutyl)phenyl]benzotriazole.

Benzophenone ultraviolet absorber -2,2'-''l Nitroxygoomethoxybenzophenone, 2,2'-
Dihydroxy-'I,\'-dimethoxybenzophenone, 2.2', &, 4t'-tetrahydroxybenzophenone, 2-hydroxy-gumethoxybenzophenone, :z,y-dihydroxybenzophenone.

The co-hydroxy-goo-octoxybenzophenone, salicylic acid-based ultraviolet absorber-phenyl salicylate, and halaoctylphenyl salicylate ultraviolet absorber can be used alone or in combination of two or more types. Among those exemplified above, benzotriazole-based ultraviolet absorbers and benzophenone-based ultraviolet absorbers are particularly preferred.

Compounds that can be used as stabilizers include dibutyltin dilaurate, dibutyltin maleate ester, and dioctyltin mercaptide.

Calcium stearate, barium stearate, zinc stearate, calcium laurate.

Barium ricinoleate, calcium oleate.

Examples include zinc octoate. These stabilizers can be used alone or in combination of two or more.

Compounds that can be used as antioxidants include:

Examples include λ, 6-tert-butyl-gumethylphenol, 2,2'-methylenebis(tert-butyl-guethylphenol), and silaurylthiodiglopionate. These antioxidants can be used alone or in combination of two or more.

Compounds that can be used as stabilizing aids include:

Examples include triphenyl phosphite, dioctyl phenyl phosphite, tris(nonylphenyl) phosphite, dienylisodecyl phosphite, trilauryl trithiophosphite, diphenyl acid phosphite, dioctyl acid phosphite, and the like. These stabilizing aids can be used alone or in combination of two or more.

Antifungal agent 5 Compounds that can be used as an antialgal agent include 2
．． ¥, 3. t-tetrachloroisophthalonitrile, 10
．． /θl-oxybisphenoxyarsine, ,z-(
y-thiazolyl)-benzimidazole, N(fluorodichloromethylthio)phthalimide, N-dimethyl-N'-phenyl-(N'-70 rhodichloromethylthio)sulfamide, paraoxybenzoic acid ester,! - Bromo! -nitroph, 3-dioxane, ,2,3.
j, O-tetrachloro-gumethylsulfonylpyridine.

Examples include 3-methyl-goochlorophenol, N(tetrachloroethylthio)phthalimide, and tributyltin laurate. These compounds can be used alone or in combination of two or more.

Examples of colorants that can be used include phthalocyanine blue, phthalocyanine green, Hansa Yellow, IJ f IJ Lake, titanium oxide, zinc white,
Permanent red, Quinaradrin. Examples include carbon black. These colorants can also be used alone or in combination of two or more.

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 tXX or less based on 100 parts by weight of the base vinyl chloride resin.

The necessary amounts of K to be blended with the base vinyl chloride resin, the component (A), the component Φ), the additive (C), and the resin feed are weighed out and mixed into a ribbon blender. Banbury mixer, super mixer, 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 1, such as melt extrusion method (T-
Conventionally known methods such as die method, inflation method), calendar molding method, solution casting method, etc. may be used.

If the thickness of the film is too thin, the strength will be insufficient, which is undesirable.On the other hand, if the film is too thick, it will be inconvenient during the film forming process and subsequent handling (including cutting, gluing, and stretching). I'll give it to you.

Range of 0.03 to 0.3 mm, preferably 0.0 to θ,
The range is preferably 2 mm.

The agricultural vinyl chloride resin film according to the present invention can be used for covering greenhouses, tunnels, etc., and can also be used for mulching in one bag.

"Effects of the Invention" As described above in detail, the present invention has the following particularly remarkable effects, and its industrial utility value is extremely high.

(1) The agricultural vinyl chloride resin film according to the present invention is made of a polymer having a relatively high average degree of polymerization.

The film has excellent cold resistance because it is formulated with a specific combination of plasticizers in a specific range.

It is resistant to folding wrinkles and scratches, and is resistant to tearing of the film due to folding wrinkles and scratches.

(2) The agricultural vinyl chloride resin film according to the present invention is a polymer having a relatively high average degree of polymerization.

Since the film contains a specific combination of plasticizers within a specific range, there is little plasticizer spraying onto the film surface, making it difficult for the films to "block" each other, and providing excellent weather resistance.

(3) The agricultural vinyl chloride resin film according to the present invention is made of a polymer having a relatively high average degree of polymerization.

Since it is formulated in combination with specific plasticity within a specific range, there is little coloring during the film-forming process, and the film-forming operation can be easily performed.

"Examples" The present invention will be explained in detail based on Examples below.
The present invention does not depart from its gist.

It is not limited to the following examples.

Examples/-, Comparative Examples/-j Polyvinyl chloride (average degree of polymerization (g) is shown in Table 1)/
θθ Part by weight Cicoethylhexyl phthalate jθ I
Trixylene phosphate j
〃Epoxy resin (manufactured by Shell Chemical Company, USA,
31 Product name "EP-, I-, 2 and") Barium-zinc composite liquid stabilizer /, j
〃Barium stearate θ, 3I zinc stearate 0. j' Ethylene bisstearamide θ, 3 1 sorbitan monostearate λ, θ Raw materials consisting of I, a plasticizer, and resin additives were weighed.

After stirring and mixing these with a super mixer, they were kneaded for 70 minutes on a roll heated to / and θ℃, and then molded into 2 pieces with a thickness of 7 mm using an L-type calender molding machine.
Various types of films were produced.

Various properties of each film or each composition for film production were evaluated according to the methods described below. The evaluation results are listed in Table 1.

([)) Test related to folding wrinkles (a) Strength of the folded wrinkled part (folding wrinkle strength) Cut each test film with a size of /θθmm×/θθmrn and cut into two pieces along the target line. Fold it to L? θtomo×? It was sandwiched between two melamine plates with a size of 0 mm. Each sample film
A load of 9/θθ was applied to the melamine board in a constant temperature room at 23° C. and relative humidity of Jθ and left for -week.

Then, the load was removed, each sample film was taken out from between the melamine plates, and each sample film, still folded, was heated to θ℃.
It was left in a constant temperature room overnight. These sample films were then spread out slowly, and each sample film was tested in accordance with JIS P F/3 (except that the triangular pyramid was replaced with a hemispherical shape with a radius of lead inches).

Capacity/o o kg・(7), impact speed 21.2m7
Impact strength was measured under conditions of 2 seconds.

(b) Strength after recovering the wrinkled part (
Folding wrinkle recovery strength) As in the case of (a) above, the films were cut, each sample film was sandwiched between melamine plates, and a load of 9 was applied to /θθ for 5 weeks.

Then, take the load from each sample film.

Each sample film was taken out from between the melamine plates and left in a constant temperature room at 23°C and jθ relative humidity for -week.

Subsequently, each sample film, still folded, was left in a thermostatic chamber at θ° C. all day and night. These sample films were then slowly expanded and the impact strength was measured for each sample film in the same manner as in (a) above.

In the tests (a) and (b), a film showing a value of 9·(7)/strip or higher for λ/θ means that it has excellent cold resistance and is resistant to tearing of the film due to folding wrinkles. do.

(g)) Scratch resistance related test (scratch tear strength) A test film with a size of 100 Inm . Each sample film was placed in a constant temperature room.
Place the 32θ mesh on the sandpaper, place a weight of /θθ2 (bottom area approximately 70g, tCa) in the center of the film, hold one end of the film with your hand, and place it on the sandpaper.
Horizontally, about 21/! The sample film was moved at a speed of θcrn/min to make a scratch on one side of each sample film.

For each sample film after scratching, the above (A
), in the same manner as described in (a).

Impact strength was measured.

In this test, a film showing a value of 2 s kg·tyn/mm or more means that the film is less likely to tear due to scratches.

C) Blocking Resistance Test A test film of size jOmm x 30omm was cut from each film and temperature-controlled in a constant temperature room at 1.23°C and relative humidity relative to SO.

Each sample film was heated in a thermostatic chamber with a diameter of /! mm, length/
It was wrapped around a test tube of jθmm once while applying a load of 8θkg to one end in the length direction.

Place the test tube wrapped with the sample film as above in a desiccator filled with water at the bottom.
was left in a small room maintained at 50°C for one week. After leaving it alone.

Take the desiccator out of the small room, wrap the film around it, take the test tube out of the desiccator, and set it at 23℃! It was left in a constant temperature room at θ relative humidity all day and night.

Attach weights of different weights to the outer edge of the sample film wrapped around the test tube via adhesive tape, and pivot the test tube for each weight, so that the sample film -23= The weight was rotated in the releasing (unwinding) direction, and the minimum weight of the weight when the sample film began to be released (unwinding) was measured.

This value is referred to as ``peel strength J('i/!θmm).

This "peel strength" means that the smaller the value, the more likely the films will block each other.

(G) Weather resistance test 9 types of films were tested with a width of approximately 2m and a depth of approximately 2-5'm.
, in an outdoor airtight test house facing south (installation location: Nimie Prefecture - Shigun) with a ridge height of approximately 1m and a roof slope of approximately 100 degrees.
From July 7th to Showa 3? The year was extended to 7.2 months, ending on the 30th day of the month. 7. For each film after 2 months,
Weather resistance was determined by visual observation.

The criteria for determining the grade were as follows.

j・・・・・・・Those with no brown spots
・・・・・・A few brown spots are observed 3 ・・・・・・A few brown spots are observed ・・・・・・ Many brown spots are observed thing/·
・・・・・・Extremely many brown spots were observed) Molding processability of film (1) Test ・・・・・・Each composition for film production.

After kneading for 10 minutes on a mixed wire roll heated to / and θ°C, a film having a thickness of θ mm was prepared. The two types of films obtained were subjected to a heat resistance test using a gear open tester at a temperature of /FO°C, and the time (minutes) until the films blackened was measured. The longer this time (minutes), the better the heat resistance and the less discoloration, which means that the processability during film formation is better.

0) Test: Each composition for film production.

After kneading for 7θ minutes on a mixed wire roll heated to 720° C., a film having a thickness of oo and 2 mm was prepared. The peelability of this film when peeled from the kneading roll and the transparency of the obtained film were observed, and the "grade" was determined.

The criteria for determining the grade are as follows:

○・・・・・・Good releasability and transparency.

△・・・・・・Poor in either releasability or transparency.

×: Poor in both releasability and transparency.

[Note] *l Means parts by weight based on 100 parts by weight of resin.

*2 The arithmetic average degree of polymerization of polyvinyl chloride is.

2/θθ.

From Table 1, the following becomes clear.

(1) The film of the example has high folding wrinkle strength.

In addition, it has high strength in the fold wrinkle recovery test, and the film is less likely to tear due to fold wrinkles.

(2) The films of the examples have high scratch resistance and are unlikely to be torn due to scratches even if there are scratches on the film surface.

(3) The films of the examples do not block easily even when the films are stacked on top of each other and left under severe conditions of high temperature and high humidity.

(4) The film of the example is easy to work with to form a film.

(5) On the other hand, none of the films of Comparative Examples showed excellent properties in all of the folding wrinkle strength, folding wrinkle recovery test, pickpocketing sand strength, blocking resistance, and film-forming work.

shi + - gozu → 1 Kano zezuto a calculation'・-1; Roma example j-2. A comparative example? Polyvinyl chloride (13-/aθθ) 100 parts by weight Phthalate ester plasticizer Shown in Table 2 1. Phosphate plasticizer Epoxidized plasticizer Barium/zinc composite liquid stabilizer 13 parts by weight Barium stearate 0.31 Zinc stearate θ,j ″Ethylene bisstearamide 0.! #
Sorbitan monostearate co, θ 〃λ-(2'-hydroxy-j'-methylphenyl) 0.2
A raw material consisting of 1 benzotriazole, a plasticizer, and a resin additive were weighed.

After stirring and mixing these with a super mixer,
The mixture was kneaded for 70 minutes on a roll heated to / and θ°C, and two types of films each having a thickness of 0.7 mm were produced using an L-shaped calender.

Each film or each film manufacturing composition
, 1'sho, and the various properties were evaluated in the same manner as in the previous example. The evaluation results are shown in Table 2.

, -411- [Cut *3 Means weight fJ, parts based on 100 parts by weight of resin.

*4 Epoxidized soybean oil From Table 2, the following becomes clear.

(1) The film of the present invention was tested for folding wrinkle strength and folding wrinkle recovery in the same manner as the films shown in Table 1.

Is it the product of pickpocket sand strength, blockability, and fill? It shows excellent properties in all aspects.

(2) On the other hand, the one with less phthalate ester plasticizer (Comparative Example B) has a lower crease strength.

Poor folding wrinkle recovery test, pickpocket sand strength, and workability when forming into a film. The one containing a large amount of phthalate ester plasticizer (Comparative Example 2) has poor folding strength and folding wrinkle recovery strength, poor progging resistance, and poor film-forming workability.

(3) The film (Comparative Example 7) that did not contain a phosphate ester plasticizer had extremely poor weather resistance;
Films containing no epoxy plasticizer (comparative examples) were inferior in weathering properties and film-forming workability.

Applicant Mitsubishi Monzant Chemical Vinyl Co., Ltd. Agent Patent Attorney Hase - (and 7 others)

Claims (3)

[Claims] (1) 100 parts by weight of a vinyl chloride resin with an average degree of polymerization of 1500 to 2500, (A) 30 to 70 parts by weight of a phthalate plasticizer, (
An agricultural vinyl chloride resin film, which is formed into a film by blending B) 1 to 7 parts by weight of a phosphate ester plasticizer and (C) 0.5 to 7 parts by weight of an epoxidized plasticizer. (2) The total amount of the three components (A), (B), and (C) is
The agricultural vinyl chloride resin film according to claim 1, wherein the amount is 40 to 80 parts by weight based on 100 parts by weight of the vinyl chloride resin. (3) The ratio of (A) to (B) is 1 to 1/5 to 1/ by weight.
35, and the ratio of (A) to (C) is 1:1/1 by weight.
0 to 1/100, the agricultural vinyl chloride resin film according to claims (1) to (2).