JPH0313256B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention is directed to the production of an anti-fog synthetic resin film that exhibits excellent anti-fog and anti-fog properties and excellent sustainability of these properties in fields of application such as agriculture and forestry, intensive entertainment, and food packaging. Concerning suitable antifog agents. Thermoplastic synthetic resins, such as polyvinyl chloride,
Films and sheets of vinyl-based or olefin-based resins such as polyvinylidene chloride, polyethylene, polypropylene, and ethylene-vinyl acetate copolymers (herein referred to collectively as films) are used for food packaging and other purposes. Widely used as agricultural covering and other materials. However, such thermoplastic synthetic resins are inherently highly hydrophobic, and when used, water condensed on the film surface turns into fine water droplets, covering the film surface and causing cloudiness, which can cause problems when using it. It is known. For example, when these films are used as a covering material for agricultural crops, moisture evaporated from the soil condenses on the film surface, causing cloudiness due to water droplets, which prevents sunlight from passing through and causes poor plant growth. In addition, water droplets fall onto the crops, damaging young shoots and causing problems such as causing diseases to the crops. Conventionally, in order to prevent such troubles, antifogging synthetic resin films have been generally used in which additives such as surfactants such as sorbitan fatty acid esters, diglycerin fatty acid esters, and glycerin fatty acid esters are kneaded into the film as antifogging agents. There is.
In particular, when used for agricultural purposes, it is preferable to use a film with excellent anti-fogging properties since it will be used continuously for a long period of time, and a film with good anti-fogging properties (leakage) is preferable from the viewpoint of crop growth and disease. preferable. Therefore, in order to produce a film with good antifogging properties and excellent durability, it is common to add a large amount of antifogging agent or to use a combination of two or more antifogging agents that have different migration speeds from the inside of the film to the surface. An attempt is being made to do so. However, the former method, that is, adding a large amount of antifogging agent, is not only extremely difficult to use in large quantities during molding processing, but also causes a decrease in film transparency due to an inconvenient increase in bleed, and other undesirable results. Therefore, it is impractical to increase the amount of antifogging agent beyond a certain point. Regarding the latter, the current situation is that an ideally effective antifogging agent has not yet been found. Conventionally, a compound obtained by condensing sorbitan fatty acid ester with 0.1 to 3.0 moles of propylene, butylene, or phenylene oxide has been proposed as an antifogging agent for use in a dropless modification method for vinyl chloride synthetic resin films. There is (Tokuko 1977-
(See Publication No. 81748). However, the degree of improvement is not necessarily fully satisfactory, and further improvement is desired. The present inventors have conducted research in order to provide an antifogging agent that can be used in a wide range of fields where antifogging properties are desired and exhibits excellent antifogging effects and excellent durability. As a result, in addition to the three reaction components of a certain polyhydric alcohol, higher fatty acid, and alkylene oxide, a reaction in which at least one selected from a certain dibasic acid and polyacrylic acid is an essential reaction component. The reaction product (ester compound) derived from the combination of ingredients provides the thermoplastic synthetic resin film with excellent leakage characteristics and excellent durability, and also has the effect of preventing the occurrence of fog in vinyl greenhouses for cultivation. The inventors have completed the present invention by discovering that the present invention exhibits a long-lasting effect, and also has excellent initial anti-fogging properties, high-temperature anti-fogging properties, and thermal anti-fogging properties. According to the studies of the present inventors, as shown later in the reference examples along with comparative tests, the present invention's preventive properties are superior to conventional sorbitan higher fatty acid esters and reaction products of the esters and polyalkylene oxides. Fogging agents have the unique property of exhibiting extremely excellent anti-fogging properties and long-lasting properties, as well as extremely excellent anti-fog properties and long-lasting properties. It has been found that it can be applied to resin films of the same type. The present invention thus provides the following components: a sorbitol and/or glycerin, b ethylene oxide and/or propylene oxide, c stearic acid, and d _C4 to _C6 saturated aliphatic dibasic acid, (i.e. succinic acid, glutaric acid, adipic acid) glutamic acid and 2-ethylhexyl acrylate/2-
The present invention provides an antifogging agent for thermoplastic synthetic resin molded articles, which contains as an active ingredient at least one reaction product selected from hydroxyethyl acrylate/acrylic acid copolymer oligomers. The antifogging agent of the present invention can be produced by reacting each of the components a to d above in any combination and/or reaction order. For example, a polyoxyalkylene polyhydric alcohol ether obtained by subjecting component a and component b to an addition reaction in advance by means known per se, and component c and d.
or, for example, by addition reaction of component a and component b by means known per se,
The obtained polyoxyalkylene polyhydric alcohol ether and component c are reacted by means known per se, and then reacted with component d by means known per se; or, for example, components a and b are reacted by means known per se. Addition reaction is carried out by known means, and the obtained polyoxyalkylene polyhydric alcohol ether is reacted with component d by means known per se, and then reacted with component c by means known per se; or, for example, a. React the component with component c and component d by means known per se, and add the resulting ester compound and component b by means known per se;
Alternatively, for example, component a and component c are reacted by a method known per se, and then component d is reacted by a method known per se, and the resulting ester compound and component b are subjected to an addition reaction by a method known per se. Shall I let you?
Alternatively, for example, component a and component d are reacted by a method known per se, and then component c is reacted by a method known per se, and the resulting ester compound and component b are subjected to an addition reaction by a method known per se. By doing so, the desired antifogging agent of the present invention can be obtained. In these exemplified production modes, polyoxyalkylene polyhydric alcohol ether is formed in advance by an addition reaction between sorbitol and/or glycerin as component a and ethylene oxide and/or propylene oxide as component b. Formation of suitable polyoxyalkylene polyhydric alcohol ethers can be carried out, for example, as follows. For example sorbitol and/or glycerin 1
mol is dissolved in a pressure cooker, and a commonly used alkali catalyst such as NaOH, eg, about 0.003 mol, and propylene oxide, 0.1 to 5 mol, are added and the addition reaction is carried out at about 45 DEG C. under pressure, for example, for about 7 hours. Next, about 0.1 to 5 moles of ethylene oxide is added and an addition reaction is carried out at about 145 DEG C. for about 3 hours under pressure to obtain a polyoxyalkylene polyhydric alcohol ether such as polyoxypropylene polyoxyethylene sorbitol. Further, the reaction between the polyoxyalkylene polyhydric alcohol ether that can be obtained as described above and the phosphoric acid as the c component and the dibasic acid and/or copolymerized oligomer as the d component can be carried out, for example, as follows. be able to. For example, 1 mole of polyoxypropylene polyoxyethylene sorbitol is added in the presence of, for example, about 0.02 mole of a commonly used esterification catalyst such as para-toluenesulfonic acid, for example 0.1 to 2 moles of stearic acid and 0.1 to 2 moles of adipic acid. Polyoxypropylene polyoxyethylene sorbitol/stearic acid/adipate ester, polyoxypropylene polyoxyethylene sorbitol by performing an esterification reaction with/or 0.1 to 2 moles of copolymer oligomer at, for example, about 200°C for about 6 hours. - Stearic acid copolymerized oligomer ester or polyoxypropylene polyoxyethylene sorbitol stearic acid adipic acid copolymerized oligomer ester can be obtained. Further, the esterification reaction between component a, component c, and component d can be carried out, for example, as follows. For example, 1 mole of glycerin is mixed with stearic acid (c
Glycerin/ Stearic acid/glutamic acid ester, glycerin/stearic acid/copolymerized oligomer ester, glycerin/stearic acid/adipate/copolymerized oligomer ester, etc. are obtained. The reaction products that can be obtained as described above can be used alone or in combination as the antifogging agent of the present invention. Furthermore, it may be used in combination with, for example, sorbitan fatty acid ester or other known antifogging agents. Examples of antifogging agents that can be used in combination include polyoxyethylene (5 moles) sorbitol monostearic acid monoadipate, polyoxypropylene (3 moles) polyoxyethylene (5 moles) sorbitol sesquistearate monoadipate. Acid ester, polyoxypropylene (1 mol) polyoxyethylene (4 mol)
Sorbitan/sesquistearic acid/half adipate, polyoxyethylene (3 moles) monoglycerin/half succinate, polyoxyethylene (4 moles) dicrycerin/monopalmitic acid/monoadipate, polyoxypropylene (1 mole) ) Polyoxyethylene (5 mol) Sorbitol/sesquistearic acid/half succinate, polyoxypropylene (1 mol) Polyoxyethylene (5 mol) Sorbitol/sesquistearic acid/half sebacic acid ester, polyoxypropylene (1 mol) ) Polyoxyethylene (4 mol) diglycerin/monostearic acid/polymethacrylic acid ester, polyoxypropylene (1 mol) polyoxyethylene (3 mol)
Examples include dipentaerythritol/monostearic acid/polyacrylic acid ester (mol), polybutylene oxide (1 mol), polyoxyethylene (3 mol), pentaerythritol/monostearic acid/half adipic acid ester, and the like. The antifogging agent of the present invention is characterized by the types of reactive components used,
Although it may vary depending on the usage ratio, reaction method, reaction conditions, combination thereof, etc., for example, the following estimated structural formula can be exemplified as a representative example. A Polyoxypropylene (A mole) Polyoxyethylene (B mole) Sorbitol, stearic acid, adipic acid ester B Polyoxypropylene (A mole) Polyoxyethylene (B mole) Glycerin, stearic acid, glitaric acid ester However, the above The terminals of the illustrated structures are connected with an alcohol group or an ester with a higher fatty acid. The antifogging agent of the present invention usually does not have film-forming ability itself and has a melting point in the range of 30 to 70°C,
Molecular weight distribution calculated from propylene glycol or polystyrene standard sample by GPC is approximately 250 ~
Preferably, it is within the range of 600. The antifogging agent of the present invention can be blended with various thermoplastic synthetic resins, particularly vinyl chloride synthetic resins, and molded into antifogging synthetic resin films and other various molded products desired to have antifogging properties. A molded article having excellent anti-fogging properties and durability can be obtained. When producing an antifogging synthetic resin film using the antifogging agent of the present invention, an antifogging agent-containing thermoplastic resin containing a thermoplastic synthetic resin, the antifogging agent of the present invention, and optionally various additives is used. The composition can be kneaded using any per se known film forming means, for example, at 170°C for 5 minutes using a heated roll, and then formed into a film having a thickness of 100 μm using an inverted L-shaped roll at 170°C. Thermoplastic synthetic resins that can be used to form such films include, for example, polyvinyl chloride,
Polyvinylidene chloride, vinyl chloride-vinyl acetate copolymer, vinyl chloride-ethylene copolymer, vinyl chloride-propylene copolymer, vinyl chloride-vinylidene chloride copolymer, vinyl chloride-acrylic acid ester copolymer and their Vinyl chloride synthetic resins such as mixtures; olefin synthetic resins such as polyethylene, polypropylene, ethylene-vinyl acetate copolymers, etc.; polyester synthetic resins; polyamide synthetic resins; polycarbonate synthetic resins; acrylic synthetic resins; styrene system synthetic resin;
Examples include vinyl-based synthetic resins such as polyvinyl acetate and polyvinyl butyral, among which vinyl chloride-based synthetic resins are suitable. Furthermore, examples of additives that can be incorporated into the resin include plasticizers, lubricants, antioxidants, antistatic agents, heat stabilizers, non-external radiation absorbers, and pigments. More specifically, for example, dibutyl phthalate, dioctyl phthalate, dioctyl diisodecyl phthalate adipate, dioctyl sebacate,
tricresyl phosphate, butylbenzyl phthalate,
Plasticizers such as epoxidized soybean oil, epoxidized linseed oil, and epoxy resin; Lubricants such as ethylene bisstearylamide, butyl stearate paraffin wax, low molecular weight polyethylene, montan acid wax, stearic acid, and stearyl alcohol; 6-di-tert-butyl-4-methylphenol, 2,4,6-tri-tert-butylphenol, 2,2'-methylenebis(4-methyl-6-tert-butylphenol), 4,4'- Antioxidants such as thiobis-(3-methyl-6-tert-butyl)phenol and phenyl-α-naphthylamine; charging agents such as polyoxyethylene alkylamides, alkylolamides, ethanolamides, alkyl phosphates, alkyl sulfates, etc. Inhibitors; heat stabilizers such as dibutyltin malate, dibutyltin dilaurate, calcium stearate, zinc ricinoleate, triphenyl phosphite; examples include pigments such as phthalocyanine blue, phthalocyanine green titanium oxide, chromophthalate, and cincasiaret. be able to. The synthetic resin film containing the antifogging agent of the present invention can be used, for example, in agriculture, forestry, agriculture, horticulture, packaging, building materials, cash registers, and electrical products. If the film is used for agriculture, forestry, agriculture, and horticulture purposes such as agricultural vinyl; for example, as a covering material for crop cultivation, clouding due to moisture evaporated from the cultivated crops and soil will be prevented, and the growth of crops will be prevented without interfering with the penetration of sunlight. It is good for plants, and there are few diseases caused by falling water droplets. In addition to the above-mentioned film applications, the antifogging agent of the present invention can also be used in packaging applications such as food packaging, for example, as food packaging materials for foods containing moisture such as fruits and vegetables. , it is possible to prevent fogging due to moisture and maintain transparency without causing fogging in the packaging film. Furthermore, when perishable foods are packaged in film and sold, they are placed in low-temperature display cases to maintain freshness, which prevents the moisture contained in the perishable foods from condensing on the film surface and causing cloudiness. Since the contents of the package can be confirmed, the display effect at the store can be improved. The antifogging agent of the present invention can be applied to building materials, such as window glass of houses, offices, stores, etc., to prevent a decrease in sunlight due to adhesion of water droplets and increase indoor temperature. By applying it to walls and ceilings, it is possible to prevent product damage from falling water droplets. In addition, when applied to the inside of an electric appliance such as a refrigerator, the flow of water droplets is improved, and the display effect of products can be improved. On the other hand, for leisure use such as ski lenses,
For example, by applying it to ski goggles, sunglasses, etc., it is possible to prevent fogging caused by condensation of water. As described above, the antifogging agent of the present invention is useful as an antifogging agent that exhibits excellent antifogging properties and durability thereof in a wide range of fields where antifogging properties or wetting properties are desired. The amount of the antifogging agent of the present invention to be used can be appropriately selected depending on the intended use.
Examples include amounts of about 0.3 to about 5.0 parts by weight per 100 parts by weight. For antifogging films for agriculture, forestry, agriculture, horticulture, etc., the preferred amount is about 0.2 to about 3.0 parts by weight per 100 parts by weight of the thermoplastic synthetic resin. EXAMPLES Hereinafter, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited only to the following Examples. In addition, in the following example,
"Parts" refer to parts by weight unless otherwise specified. Example 1 Polyoxypropylene (3 moles) Polyoxyethylene (5 moles) Sorbitol, stearic acid,
Synthesis of adipate ester Dissolve 1 mole of sorbitol (molecular weight: 182) in a pressure cooker, and add alkali-catalyzed NaOH (molecular weight:
40) 0.003 mol and propylene oxide (molecular weight: 58)
Add 3 moles and carry out an addition reaction at 150°C for 6 hours under pressure. Next, 5 moles of ethylene oxide (molecular weight: 44) are added and an addition reaction is carried out at 150°C for 3 hours under pressure to obtain polyoxypropylene (3 moles), polyoxyethylene (5 moles), and sorbitol. Next, add polyoxypropylene (3 moles), polyoxyethylene (5 moles), 1 mole of sorbitol, esterification catalyst para-toluenesulfonic acid (0.02 moles), 1.5 moles of thearic acid (molecular weight: 284.3), and adipic acid (molecular weight: 146.2). Add 0.41 mol,
Esterification reaction was carried out at 200℃ for 6 hours, and polyoxypropylene (3 mol) polyoxyethylene (5 mol)
Mol) Obtain sorbitol stearic acid adipate ester. Example 2 Polyoxypropylene (1 mol) Polyoxyethylene (5 mol) Sorbitol Stearic acid
Synthesis of adipate ester Dissolve 1 mol of sorbitol in a pressure cooker, add 0.003 mol of alkali catalyst NaOH (molecular weight: 40) and 1 mol of propylene oxide (molecular weight: 58), and conduct an addition reaction at 145°C for 7 hours under pressure. conduct. Next, 5 moles of ethylene oxide is added and an addition reaction is carried out at 145°C for 3 hours under pressure to obtain polyoxypropylene (1 mole), polyoxyethylene (5 moles), and sorbitol. To polyoxypropylene (1 mol), polyoxyethylene (5 mol), and 1 mol of sorbitol, esterification catalysts 0.02 mol of paratoluenesulfonic acid, 1.5 mol of stearic acid, and 0.41 mol of adipic acid were added, and the esterification reaction was carried out at 200°C for 6 hours. Polyoxypropylene (1 mol), polyoxyethylene (5 mol), and sorbitol/stearic acid/adipate ester were obtained. Example 3 Polyoxyethylene (5 mol) Sorbitol
Synthesis of stearic acid/glutamic acid ester Dissolve 1 mol of sorbitol in a pressure cooker, add 0.003 mol of alkali catalyst KOH (molecular weight: 56) and 5 mol of ethylene oxide, perform an addition reaction under pressure at 145°C for 4 hours, and make polyester. Obtain oxyethylene (5 mol) sorbitol. Polyoxyethylene (5 mol) Sorbitol 1
Esterification catalyst para-toluenesulfonic acid in mole
0.015 mol, stearic acid 1.3 mol, and glutamic acid (molecular weight: 147.1) 0.4 mol were added, and an esterification reaction was carried out at 200°C for 6 hours to obtain polyoxyethylene (5 mol) sorbitol stearic acid glutamic acid ester. Example 4 Synthesis of polyoxyethylene (3 mol) glycerin/stearic acid/succinic acid ester 1 mol of glycerin (molecular weight: 92.1) was dissolved in a pressure cooker, and 0.002 mol of alkali catalyst NaOH and 3 mol of ethylene oxide were added. 3 at 145℃ under pressure
A time addition reaction is performed to obtain polyoxyethylene (3 mol) glycerin. Polyoxyethylene (3 mol), glycerin 1 mol, esterification catalyst para-toluenesulfonic acid
Polyoxyethylene (3
molar) to obtain glycerin, stearic acid, and succinic acid ester. Example 5 At the same time as in Example 2, polyoxypropylene (1 mol), polyoxyethylene (5 mol), sorbitol (1 mol), and stearic acid (1.5 mol) were reacted to form polyoxypropylene (1 mol), polyoxyethylene (5 mol), and polyoxyethylene (5 mol). molar) to obtain sorbitol stearate. Next, 1 mol of copolymerized acrylic acid oligomer (molecular weight: 1200) of 2-ethylhexyl acrylate/2-hydroxyethyl acrylate/acrylic acid (weight ratio 90:5:5), polyoxypropylene (1 mol), polyoxyethylene ( 5 mol) 1 mol of sorbitol stearate and 0.05 mol of esterification catalyst toluenesulfonic acid were gradually heated from low temperature in 180 g of toluene to 110°C for 2 hours.
After reacting for a few hours, cold water is added to the reaction solution, the precipitate is filtered, and the precipitate is filtered and dried.
A sorbitol/stearic acid copolymerized acrylic acid oligomer ester is obtained. Reference example 1 100 parts of polyvinyl chloride, dioctyl phthalate
50 copies. 2 parts of epoxy soybean oil, 0.5 part of barium stearate, 1.0 part of zinc stearate, 0.5 part of triphenyl phosphite, and the antifogging agent of the present invention obtained in Example 1 Polyoxypropylene (3 mol) Polyoxyethylene (5 mol) ) 1.5 parts of sorbitol, sesquistearic acid, and half adipate were mixed. Next, a film having a thickness of 0.1 m/m was prepared from the mixture using a calender roll in a conventional manner. The performance of this sheet is shown in Table 1 below.
Shown in Tables 2 and 3. For comparison, these ratios also show the results obtained in the same manner as in Reference Example 1, except that the following antifogging agent was used instead of the antifogging agent of the present invention.

[Table] Reference Example 2 Example 1 was carried out in the same manner as in Reference Example 1, except that 0.7 part of the known antifogging agent sorbitan monostearate was used together with 0.8 part of the antifogging agent of the present invention. The results are shown in Tables 1, 2 and 3 below. Reference Example 3 In Reference Example 1, except that the antifogging agent of the present invention obtained in Example 2, polyoxypropylene (1 mol), polyoxyethylene (5 mol), sorbitol/stearic acid/adipate ester was used. I went in the same way. The results are shown in Tables 1 and 2 below.
Shown in Table and Table 3. Reference Example 4 In Reference Example 1, the same procedure as in Reference Example 1 was carried out except that the antifogging agent of the present invention, polyoxyethylene (5 mol) sorbitol/stearic acid/glutamic acid ester obtained in Example 3 was used. The results are shown in Tables 1, 2 and 3 below. Reference Example 5 In Reference Example 1, except that the antifogging agents of the present invention obtained in Example 5, polyoxypropylene (1 mol), polyoxyethylene (5 mol), sorbitol, stearic acid, and copolymerized acrylic acid-based oligomer ester were used. , in the same manner as in Reference Example 1. The results are shown in Tables 1, 2 and 3 below. Reference Example 6 The same procedure as in Reference Example 1 was conducted except that 0.8 part of the antifogging agent of the present invention obtained in Example 2 and 0.7 part of known sorbitan monopalmitate were used together. The results are shown in Tables 1, 2 and 3 below. Reference Example 7 In Reference Example 1, the antifogging agent of the present invention of Example 4
The same procedure as in Reference Example 1 was carried out except that 0.9 parts of known sorbitan monostearate was used together with 0.6 parts. The results are shown in Tables 1, 2 and 3 below. The test methods and evaluations in Tables 1, 2, and 3 below are as follows. High-temperature anti-fog properties: Pour 100 c.c. of 40°C warm water into a 200 c.c. beaker, cover the beaker's mouth with a sheet, and secure and seal it with a rubber band or tape. The film is fixed in a constant temperature bath at the same temperature and evaluated by observing the condensation state of the film after 60 minutes. Low-temperature anti-fogging property…Put in a 200c.c. beaker of 20°C water, 5
Fixed the film in a constant temperature bath at 60°C.
Evaluate by observing after minutes. In addition, high-temperature and low-temperature antifogging properties are evaluated using the following 10 ranks. 10 Water droplet adhesion area on the inner surface of the film is less than 5% 9 〃 5% or more and less than 10% 8 〃 10% or more and less than 20% 7 〃 20% or more and less than 30% 6 〃 30% or more and less than 40% 5 〃 40% or more and less than 50% Less than 4 〃 50% or more and less than 60% 3 〃 60% or more and less than 80% 2 〃 80% or more and less than 90% 1 〃 90% or more of antifogging agent duration...Pour 100 c.c. of water into a 200 c.c. beaker,
Cover the opening of the beaker with a sheet and secure and seal it with a rubber band and tape. Fix the beaker so that the water surface height in the bathtub and the water surface height in the beaker are approximately the same. The bathtub temperature was maintained at 40°C for 4 days, and the condensation state of the film was evaluated at regular intervals during a one-day heating cycle. The anti-fog durability is evaluated using the following 10 ranks. 10 Anti-fog deterioration (area where anti-fog effect is lost) on the inner surface of the film is less than 5% 9 〃 5% or more and less than 10% 8 〃 10% or more and less than 20% 7 〃 20% or more and less than 30% 6 〃 30% 40% or more and less than 50% 4 50% or more and less than 60% 3 60% or more and less than 70% 2 80% or more and less than 90% 1 90% or more

【table】

[Table] Fog evaluation: Spread the film on a pipe house with a height of 2.7 m, a width of 4.6 m, and a length of 6.7 m, and measure the photovoltaic illumination meter (Tokyo Kogaku Kikai Co., Ltd.) at the center of the house at a height of approximately 50 cm.
The solar transmittance was measured using the following method. The solar transmittance inside the house was measured when fog appeared in the evening, the greenhouse was immediately ventilated, and after the fog disappeared, the solar transmittance was measured again. The average transmittance for 3 days is shown in Table 3. Table 3 also shows the average fog generation time over 5 days as determined by visual observation. Note that the shorter the fog generation time, the faster the fog disappears.

[Table] As is clear from the evaluation results of antifogging properties and durability shown in Tables 1 and 2, the film to which the antifogging agent of the present invention has been added does not contain the conventional antifogging agent sorbitan ester or its antifogging agent. It can be seen that the antifogging agent and the lasting effect are significantly superior to that of the film containing the oxyalkylene adduct. Furthermore, as is clear from Table 3, the antifogging agent-added film of the present invention is superior in generating extremely less fog in a spreading house than the conventional antifogging agent-containing film. As mentioned above, the sheet using the novel antifogging agent of the present invention has a good antifogging effect and has an unprecedented antifogging durability, making it suitable for agricultural films that are used continuously for a long time. Moreover, since the generation of fog inside the greenhouse is extremely small compared to conventional films, it is effective in suppressing diseases of agricultural crops, and its utility value is extremely large.

Claims (1)

[Claims] 1 a Sorbitol and/or glycerin, b ethylene oxide and/or propylene oxide, c stearic acid, and d C ₄ to _{C 6} saturated aliphatic dibasic acids, glutamic acid and 2-ethylhexyl acrylate/2- An antifogging agent for thermoplastic synthetic resin molded articles, comprising as an active ingredient at least one reaction product selected from hydroxyethyl acrylate/acrylic acid copolymer oligomers.