JPH0134782B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an agricultural vinyl chloride resin film, and more specifically, an agricultural vinyl chloride resin film that is less likely to stick to each other when overlapped (has excellent non-adhesive properties);
Furthermore, it relates to an agricultural vinyl chloride resin film that is non-adhesive and has excellent heat retention properties. In recent years, farmers cultivating useful plants have widely adopted methods of promoting the cultivation of useful plants in greenhouses or tunnels in order to increase profitability. As the covering material for this house or tunnel, vinyl chloride resin film, polyethylene film, ethylene-vinyl acetate copolymer film, polyethylene terephthalate film, etc. are used. Among them, soft vinyl chloride resin films are used the most because they are superior in weather resistance, transparency, heat retention, and strength compared to other synthetic resin films. Soft vinyl chloride resin film is soft and elastic, so it has the advantage of being able to be easily stretched into any shape of house or tunnel. This property (so-called stickiness) is greater than that of polyethylene film or ethylene-vinyl acetate copolymer film. If the adhesiveness of the film is high, the efficiency of spreading the film into a house or tunnel will decrease, and the efficiency of bonding the films together using high-frequency bonding will also decrease.
After being deployed in a house or tunnel, there is a problem that the ventilation work inside the house or tunnel and the opening/closing work of the house or tunnel are reduced. The tackiness of soft vinyl chloride resin films is largely due to the combination of plasticizers, but it is known that antifogging agents added to agricultural vinyl chloride resin films further increase the tackiness. There is. Examples of cases where the soft vinyl chloride resin film exhibits the property of adhering to each other, that is, adhesiveness, are as follows. (1) Adhesion at low temperatures A phenomenon observed when handling soft vinyl chloride resin films at relatively low temperatures below 40°C.
In this case, no fusion phenomenon is observed. (2) Adhesiveness at high temperatures When soft vinyl chloride resin film is used as a covering material for a house or tunnel, the films may be stacked or bundled outdoors to ventilate the inside of the house or tunnel. and is often exposed to direct sunlight. In this case, the film temperature rises to 40-80°C. At such high temperatures, the films adhere to each other, and in some cases even fuse, and even when the temperature of the films drops, it takes considerable effort to separate them. reach. (3) Adhesion at high temperatures and in wet conditions This is the same phenomenon as in (2), but if stacked or bundled films are exposed to high temperatures while wet, moisture between the films will increase. After evaporation, a severe adhesive phenomenon occurs. Many techniques have been proposed and some have been put into practical use to eliminate the tackiness of such soft vinyl chloride resin films and make them exhibit non-adhesion (improving the non-adhesion). Techniques for making agricultural vinyl chloride resin films exhibit non-adhesive properties include a method of blending various anti-blocking agents with the base vinyl chloride resin to form a film, and a method of blending inert solid fine particles to form a film. , and a method of combining both. The method of forming a film by blending various anti-blocking agents with the base vinyl chloride resin has a problem in that it is difficult to improve the non-stick properties at low temperatures. The reason why a film containing an anti-adhesive agent exhibits an anti-adhesive effect is that the anti-adhesive agent is ejected onto the film surface. Generally, anti-blocking agents are difficult to spray out onto the film surface at low temperatures, and in order to exhibit non-stick properties even at low temperatures, the amount of the anti-blocking agent must be increased. If a large amount of anti-adhesive is added, the anti-adhesive will spray out more at high temperatures, reducing the transparency of the film.Dust will adhere to the film while it is used as a covering material for a house or tunnel, further reducing the transparency. The disadvantage is that the value decreases. In the method of blending various inert solid fine particles to form a film and improving non-adhesion, the surface of the film is textured with the inert solid fine particles. In order to create a textured surface of the film, it is necessary to increase the amount of inert solid particles added, which inevitably reduces the transparency of the film. This method can improve the non-stick properties of the film at low temperatures, but in order to improve the non-stick properties at high temperatures, high temperatures, and wet conditions,
It doesn't have much effect. As a method that combines both of these,
The methods described in Japanese Patent Application Laid-open No. 54-30698 and Japanese Patent Application Laid-open No. 55-43114 have been proposed. The method described in Japanese Patent Publication No. 54-30698 is to mix a lubricant with a melting point of 60°C or higher and inert solid particles with a particle size of 0.05 to 10 microns to the basic composition for producing a soft polyvinyl chloride film. It has become. However, the combination of a lubricant with a melting point of 60°C or higher and inert solid fine particles with a particle size of 0.05 to 10 microns exhibits the effect of improving non-adhesion in all three cases where the film exhibits tackiness. It's not worth it. Recently, agricultural vinyl chloride resin films are required not only to have the above-mentioned excellent non-stick properties but also to exhibit even better heat retention properties. In order for an agricultural vinyl chloride resin film to exhibit excellent heat retention properties, (a) it must be able to transmit as much sunlight as possible into the greenhouse or tunnel during the day when it is irradiated with sunlight; (b) Avoid releasing the heat accumulated in the clay pot as much as possible, which is heated by the sun's rays. It is necessary to have two properties: To satisfy property (a) above, the vinyl chloride resin film must be transparent, and to satisfy property (b) above, the heat rays emitted from the clay pot (5 microns to 25 microns) are required to be transparent. (equivalent to wavelengths in the infrared region in the range of As a method for improving the heat retention of synthetic resin films for covering houses or tunnels,
A technique described in Publication No. 43114 has been proposed. This involves adding inert solid fine particles that have absorption ability in the infrared region to a synthetic resin film that serves as a base. However, these conventional techniques have the following problems. (1) When blending and mixing inert solid particles with synthetic resin raw materials, powdering of the solid particles tends to occur, reducing the efficiency of blending and mixing. (2) Furthermore, since solid fine particles have a small bulk specific gravity, they are lightweight and bulky, and even if they are blended and mixed with raw material synthetic resins, it is difficult to uniformly disperse the two. (3) In order to improve the drawbacks of (1) and (2) above, if solid particles with a large particle size are used, the final film surface will be rough and pinholes will appear on the film surface. The tear strength of the film decreases. Furthermore, the transparency of the film also decreases. (4) Inert solid particles generally have a high hardness, so during the process of compounding and mixing raw material synthetic resin and forming a film, they cause wear and tear on mixers and film forming machines, and they also cause wear and tear. Metal powder gets mixed into the synthetic resin film, causing the film to become discolored and its weather resistance to deteriorate. (5) In order for a synthetic resin film for agricultural use to exhibit heat retention properties, the above properties (a) (transparency of the film) and
It is necessary to have the property (b) (heat retention),
In order to improve the properties of (b), inert solid fine particles are blended, but this is not preferred because the properties of (a) deteriorate. Further, with the conventional technology, it is difficult to prevent heat rays in the range of 5 microns to 25 microns from being emitted outside the house over the entire range. Under such circumstances, the present inventors have an object to provide an agricultural synthetic resin film with improved non-adhesiveness and excellent quality by eliminating various problems in the film-forming process in the prior art, and With the aim of providing a synthetic resin film for agricultural use with improved heat retention and excellent quality, the present invention has been completed as a result of intensive studies. Therefore, the first object of the present invention is to add 30 to 60 parts by weight of a plasticizer and an antifogging agent to 100 parts by weight of a vinyl chloride resin.
A vinyl chloride resin composition containing 0.5 to 5 parts by weight of N,N'-dioleyladipamide,
This is achieved by an agricultural vinyl chloride resin film which is formed into a film by blending at least one of N,N'-distearyladipamide and ethylenebislaurylamide. Furthermore, the second object of the present invention is to
100 parts by weight, 30 to 60 parts by weight of plasticizer and 0.5 to 0.5 parts by weight of antifogging agent
A vinyl chloride resin composition containing 5 parts by weight of N,N'-dioleyladipamide, N,
At least one of N'-distearyl adipamide and ethylenebislaurylamide, which absorbs in the infrared region with wavelengths ranging from 5 microns to 25 microns, has a bulk specific gravity of 0.1 g/cm ³ or more, and has an average particle size of In the range of 0.5 micron to 10 micron,
In addition, an agricultural polyvinyl chloride resin film is formed by blending inert solid particles with a Mohs hardness of 4 or less, and has a straight light transmittance of 75% or more at a wavelength of 555 millimicrons. Then, it will be achieved. 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 monomer copolymerizable with it; This term also includes blends with polymers and copolymers. The film of the present invention is formed from a soft blended vinyl chloride resin composition containing an antifogging agent. To make a soft blend, add about 30 to 30 parts of liquid plasticizer to 100 parts by weight of the above vinyl chloride resin.
Contains 60 parts by weight. Preferred liquid plasticizers in the present invention include:
For example, phthalic acid derivatives such as di-n-octyl phthalate, di-2-ethylhexyl phthalate, dibenzyl phthalate, diisodecyl phthalate, didodecyl phthalate, and diundecyl phthalate; isophthalic acid derivatives such as diisooctyl isophthalate; di-n- Adipic acid derivatives such as butyl adipate and dioctyl adipate; di-n-
Maleic acid derivatives such as butyl maleate; tri-n
- Citric acid derivatives such as butyl citrate; Itaconic acid derivatives such as monobutyl itaconate; Oleic acid derivatives such as butyl oleate; Ricinoleic acid derivatives such as glyceryl monoricinoleate; Other tricresyl phosphate, epoxidized soybean oil, Examples include epoxy resin plasticizers. The amount of antifogging agent blended into the soft blended vinyl chloride resin composition is usually the amount blended into agricultural vinyl film, and is in the range of 0.5 to 5 parts by weight per 100 parts by weight of the vinyl chloride resin. It is. If the amount of the antifogging agent is less than 0.5 parts by weight, sufficient antifogging properties cannot be achieved, and if it is more than 5 parts by weight, the antifogging properties are sufficient, but the antifogging agent may bleed out. As the amount increases, peel stress, especially adhesive strength in a wet state, increases, which is also economically disadvantageous. Examples of the antifogging agent include nonionic surfactants, polyoxyethylene glycerin monostearate, and the like. Further, a heat stabilizer, an antistatic agent, an ultraviolet absorber, a pigment, a dye, etc. can be added to the vinyl chloride resin before the film forming step, if necessary. Heat stabilizers that can be blended include stearic acid,
Examples of antistatic agents include zinc stearate, fatty alcohol, calcium stearate, barium stearate, barium ricinoleate, dibutyltin dilaurate, dibutyltin dimaleate, etc. Antistatic agents include the same as antifogging agents, such as nonionic surfactants and polyesters. Examples of the UV absorber include oxyethylene glycerol monostearate, and examples of the UV absorber include hydroquinone-based UV absorbers, salicylic acid-based UV absorbers, benzophenone-based UV absorbers, and benzotriazole-based UV absorbers. Of course, these resin additives are not limited to those exemplified. These resin additives are used in a usual amount, for example, 5 parts by weight or less per 100 parts by weight of the resin. The agricultural vinyl chloride resin film according to the present invention comprises N,N'-dioleyladipamide, N,
At least one of N'-distearyl adipamide and ethylene bislaurylamide is blended and mixed. These additives function to provide the film with significant non-stick properties. When at least one of the above compounds is blended or mixed, if one of the three compounds is blended or mixed, one of the above three compounds is blended or mixed in combination with another anti-blocking agent. When the anti-blocking agent is used, combinations of two or more of the above three types, combinations of two or more of the above three types and further anti-blocking agents, etc. are included. When using a combination of two or more of these anti-blocking agents, it is preferable to combine a compound with a melting point of 120°C or lower and a compound with a melting point of 130°C or higher. When two or more types are combined, the above combination is preferred because the film can exhibit non-adhesive properties in all of the above three modes in which the film exhibits adhesive properties. In other words, when two or more compounds with different melting points are used in combination, the compound with a higher melting point is mainly responsible for (2) non-stickiness at high temperatures, and (3) non-stickiness at high temperatures and humidity. Non-stick properties in the state can be significantly improved. On the other hand, a compound with a low melting point can significantly improve mainly (1) non-stick property at low temperatures among the three ways in which the film exhibits stickiness. If the amount of the above-mentioned compound added to the base vinyl chloride resin is too small, the effect of improving non-tackiness will not be exhibited, which is undesirable, and if it is too large, the problem of spraying onto the film surface will occur, which is not preferable. The blending amount varies depending on the thickness of the film, but is preferably 0.05 to 1.0 parts by weight based on the base resin. In order to achieve the second object of the present invention, in addition to blending the above-mentioned compound into the base vinyl chloride resin, inert solid particles are also blended. These inert solid particles have wavelengths from 5 microns to
It absorbs in the infrared region in the range of 25 microns, has a bulk specific gravity of 0.1 g/cm ³ or more, an average particle size in the range of 0.5 microns to 10 microns, and has a Mohs hardness of 4 or less. These inert solid particles prevent heat rays with wavelengths in the infrared region ranging from 5 microns to 25 microns from being emitted outside the house, and also improve the anti-stick properties of the film, especially in conjunction with the above-mentioned compounds, at low temperatures. It functions to improve the non-stick properties of the film. These inert solid particles have a bulk specific gravity of 0.1 g/cm ³
If it is smaller, it is lighter and bulkier than the vinyl chloride resin powder that is the base material, so it is more likely to cause dusting, which reduces work efficiency during compounding and mixing. This is because it becomes difficult to disperse uniformly. Furthermore, the reason why the average particle size is set in the range of 0.5 microns to 10 microns is that if it is smaller than 0.5 microns, it is difficult to roughen the film surface and the non-adhesive property improvement effect at low temperatures cannot be achieved. If the diameter is larger than 10 microns, the transparency of the film decreases, pinholes are likely to occur on the film surface, and the strength decreases significantly. Next, set the Mohs hardness to 4
If the hardness exceeds 4, the process of mixing with the base vinyl chloride resin and the process of forming the mixture into a film will wear and damage these devices, and the worn and damaged metal powder will be chlorinated. This is because they may get mixed into the vinyl resin film, causing problems such as coloring the film and deteriorating its weather resistance. Specific examples of inert solid particles include feldspar, calcium carbonate, magnesium carbonate, magnesium silicate, talc, aluminum hydroxide, etc., but they are limited to the exemplified ones as long as they meet the above requirements. It's not something you can do. Inert solid particles absorb heat rays in the infrared region with wavelengths ranging from 5 microns to 25 microns and prevent them from being emitted outside the house, but it is difficult to satisfy this property with just one type. Therefore, it is preferable to use two or more kinds together. If the blending ratio of the inert solid particles is too small, it will be difficult to roughen the film surface, and the non-adhesive property improvement effect at low temperatures will not be exhibited. On the other hand, if the amount is too large, the non-adhesive property can be improved at low temperatures, but the transparency of the film decreases, which is not preferable. The optimal blending ratio varies depending on the average particle size of the inert solid particles, the thickness of the film, etc., but is usually 0.5 to 100 parts by weight of the base material.
It is 10 parts by weight. In order to blend and mix the above-mentioned additive components with the vinyl chloride resin that serves as the base, ordinary blending and mixing techniques such as a ribbon blender, Banbury mixer, and other blenders and mixers can be used. The agricultural vinyl chloride resin film according to the present invention is made by blending and mixing the above additive components, and has a straight light transmittance of 75% or more at a wavelength of 555 millimicrons. This is because if the straight light transmittance is less than 75%, it is not suitable as a material for covering a house. The thickness of the agricultural vinyl chloride resin film according to the present invention is 0.05 mm, since if it is too thin, the heat retention will not improve and pinholes will easily occur in the film.
The above is preferable, and the upper limit is preferably about 0.3 mm. In order to manufacture the agricultural vinyl chloride resin film according to the present invention, ordinary film manufacturing methods such as calendar molding, extrusion molding, inflation molding, etc. can be appropriately employed. The agricultural vinyl chloride resin film according to the present invention has the following characteristics, and its industrial utility value is extremely large. Since the agricultural vinyl chloride resin film according to the present invention contains a specific compound, the non-tackiness of the film is greatly improved. In particular, when a compound with a low melting point and a compound with a high melting point are combined and blended, the non-stick properties of the film at low temperatures and the non-stick properties at high temperatures, high temperatures, and humidity are simultaneously improved. The agricultural vinyl chloride resin film according to the second aspect of the present invention contains inert solid particles that absorb heat rays, so that the heat rays emitted from the soil are not released outside the greenhouse or tunnel. , excellent heat retention. The agricultural vinyl chloride resin film according to the second aspect of the present invention uses particles with a specific bulk specific gravity as the inert solid particles, so the film manufacturing efficiency is not reduced and the solid particles are easily dispersed. It can be uniform. Since the inert solid fine particles have a specific particle size, the agricultural vinyl chloride resin film according to the second aspect of the present invention not only has improved non-stick properties at low temperatures, but also
Pinholes do not easily form on the film surface, and it has excellent transparency and tear strength. Since the agricultural vinyl chloride resin film according to the second aspect of the present invention uses inert solid particles having a specific hardness, the molding machine is not worn or damaged during the film manufacturing process. The film is not colored by abraded or damaged metal powder, and its weather resistance is not deteriorated. Hereinafter, the agricultural vinyl chloride resin film according to the present invention will be described in detail based on Examples, but the present invention is not limited to the following examples unless it exceeds the gist thereof. Examples 1 to 7, Comparative Examples 1 to 9, Reference Examples 1 to 3 Polyvinyl chloride (=1400)...100 parts by weight Dioctyl phthalate...45 Tricresyl phosphate...5 Epoxy resin stabilizer (Product name EP-828)
...1 Barium-zinc composite liquid stabilizer ...1 Barium stearate ...0.2 Zinc stearate ...0.4 Sorbitan monostearate
A resin composition consisting of a predetermined part by weight (listed in Table 1) was prepared, and an anti-blocking agent of the type and amount shown in Table 1 was added thereto. After stirring and mixing each compound with a super mixer for 10 minutes, kneading it on a mill roll heated to 165°C,
A film with a thickness of 0.10 mm was prepared. Table 1 shows the quality evaluation results for each film. The evaluation and judgment methods for these qualities were as follows. (b) Ejecting properties of additives after 6 months The film surface that had been left indoors for 6 months was judged by lightly rubbing it with a fingertip. ``〇'' indicates that there are almost no finger marks left on the surface, ``〇 _× '' indicates that finger marks are slightly observed, ``△'' indicates that finger marks are significantly observed, and ``△'' indicates that finger marks are significantly observed. was marked as "×". (B) Adhesiveness Two films of 30 mm x 100 mm were stacked and pressed together with rubber rolls to eliminate air between the films and make them stick together. This tightly adhered film was placed in an oven set at a predetermined temperature (30°C, 50°C, 80°C) and maintained at this temperature for 2 hours. Next, the films were taken out of the oven and left at room temperature for 15 minutes, and then the two films were peeled off using a tensile tester, and the peel stress at that time was measured. The adhesion in a wet state was measured by placing two films together, adding moisture between the films, adhering them to each other in the same manner as above, and measuring the peeling stress in the same manner as above. (E) Anti-fogging property The upper part of a thermal container (diameter 15 cm, height 17 cm) filled with 25°C water up to 2/3 of the container capacity was sealed with a sample film and placed in a cold air circulating cold room at 5°C. The state of water condensation on the inner surface of the film was visually observed over time. 〇…Water is attached in a thin film, but slightly large water droplets are observed. 〇 _× …Water is attached in a thin film, but large water droplets are observed to be attached in some areas. △…A state in which fine water droplets are observed to be attached partially. ×: Condition in which fine water droplets are observed on the entire surface.

【table】

【table】

[Table] From Table 1, the following becomes clear. (1) The agricultural vinyl chloride resin film according to the present invention has less additives spewing out onto the film surface, and has extremely good non-adhesive properties in both dry and wet states. (2) On the other hand, in the case of a film in which no anti-blocking agent was used, the additives were not sprayed onto the film surface much, but the films significantly stuck to each other (see Comparative Example 6). (3) When a compound other than the essential compounds of the present invention is used as an anti-adhesive agent, there may be a large amount of spraying onto the film surface, and the film may not be able to exhibit sufficient non-adhesive properties (Comparative Example 1) ~5)). Examples 8 to 13, Comparative Examples 10 to 16 Polyvinyl chloride (=1400)...100 parts by weight Dioctyl phthalate...45 Tricresyl phosphate...5 Epoxy resin stabilizer (trade name EP-828 )
...1〃 Barium-zinc composite liquid stabilizer ...1〃 Barium stearate ...0.2〃 Zinc stearate ...0.4 〃 Sorbitan monostearate ...1.5〃 A resin composition was prepared, and a The type and amount of anti-blocking agent and inert solid fine particles shown in Table 2 were blended. After stirring and mixing each compound with a super mixer for 10 minutes, kneading it on a mill roll heated to 165°C,
A film with a thickness of 0.05 mm was prepared. Table 2 shows the quality evaluation results for each film. The evaluation and judgment methods for these qualities were as follows. (c) Presence or absence of dusting Observation was made with the naked eye. Cases in which dusting was not observed were marked as "〇", and cases in which dusting was observed were marked as "×". (d) Dispersibility of inert solid fine particles An anti-tack agent and inert solid fine particles were blended into a resin composition, stirred and mixed in a super mixer, and a portion of the mixture was taken and visually observed and determined. A case where the inert solid fine particles were almost uniformly dispersed was marked as "○", and a case where the dispersion was extremely non-uniform was marked as "x". (e) Wear of molding equipment The raw materials were stirred and mixed using a super mixer, then a portion of the mixture was kneaded on a mill roll, and
Qualitative metal analysis was performed using conventional methods. Cases in which no metal derived from molding equipment materials were detected were marked as "○", and cases in which metals were detected were marked as "×". (f) Presence or absence of pinholes Observed with the naked eye. Cases in which pinholes were not observed were marked as "〇", and cases in which pinholes were observed were marked as "×". (g) Coloring status Observed with the naked eye. Those that were not colored were marked as "○", those that were colored were marked as "x", and the color tone was also written. (H) Straight light transmittance at 555 mμ Measured using a spectrophotometer model 323 manufactured by Hitachi, Ltd. (i) Ejection property of additive after 6 months Same as described in (a) for Examples 1 to 7. (J) Adhesion Same as described in (B) for Examples 1 to 7. (Le) Heat retention A field with a diameter of 2m and a length of 2m in Isshi District, Mie Prefecture.
An open-air tunnel was set up, the tunnel was covered with each film, and the temperature inside the tunnel at night was measured at the center of the tunnel. The measurement period was 5 days from November 20th to November 24th, 1980. Temperatures were measured hourly from 6:00 pm to 6:00 am the next day, and the temperatures during this period were averaged. The average temperature for the day was calculated, and the average temperature for 5 days was also shown.

【table】

[Table] From Table 2, the following is clear. (1) The agricultural vinyl chloride resin film according to the present invention has no trouble during film production, has excellent film quality, and exhibits excellent non-stick properties in a wide temperature range from room temperature to 80°C. It also exhibits excellent heat retention (Examples 8 to 13)
reference). (2) On the other hand, in order to improve the non-adhesiveness of the film, the non-adhesive agent which is not essential in the present invention and which has a low melting point is added, the non-adhesive property at low temperatures is There was no significant improvement (Comparative Example 11), and when the amount added was increased, the non-adhesiveness at low temperatures improved, but the additive sprayed out onto the film surface became severe (Comparative Example 12,
13). (3) In addition to the anti-blocking agent, if inert solid particles are added, the bulk specific gravity of the particles is 0.1 g/cm ³
If it is smaller, the film will be dusty and will not be uniformly dispersed in the film (see Comparative Example 14). Furthermore, when inert solid fine particles with high Mohs' hardness are used, molding equipment is abraded and damaged (see Comparative Example 15).
If inert solid particles having an average particle diameter of more than 10 microns are included, the film will have many pinholes and will be of poor quality (see Comparative Example 16). Note that Examples 8 to 13 and Comparative Examples 10, 14, and 15 had good antifogging properties, but other Comparative Examples had poor antifogging properties. In addition, in Example 8, in which no antifogging agent was added, the processability, film quality, adhesion, and heat retention properties were almost the same as in Example 8, but the antifogging properties were significantly lower. It was inferior.

Claims (1)

[Claims] 1 100 parts by weight of vinyl chloride resin and 30 to 60 parts of plasticizer
N,N'-dioleyl adipamide, N,N'-distearyl adipamide, ethylene bislauryl amide, and a vinyl chloride resin composition containing 0.5 to 5 parts by weight of an antifogging agent. An agricultural vinyl chloride resin film characterized by being formed into a film by blending at least one of the above. 2 100 parts by weight of vinyl chloride resin and 30 to 60 parts of plasticizer
N,N'-dioleyl adipamide, N,N'-distearyl adipamide, ethylene bislauryl amide, and a vinyl chloride resin composition containing 0.5 to 5 parts by weight of an antifogging agent. At least one of the above and absorbs in the infrared region with a wavelength of 5 microns to 25 microns, and has a bulk specific gravity.
0.1g/cm3 or ^more , average particle size 0.5 micron to 10
A film is formed by blending inert solid particles in the micron range and with a Mohs hardness of 4 or less.
An agricultural vinyl chloride resin film characterized by a straight light transmittance of 75% or more at 555 mm. 3. The agricultural vinyl chloride resin film according to claim 2, wherein the inert solid fine particles are talc.