JPS5991136A - Antifogging thermoplastic synthetic resin molding - Google Patents

Abstract

PURPOSE:To provide the titled resin molding, particularly non-rigid vinyl chloride resin film having excellent durable antifogging properties and mist-proofness, by incorporating an ester of an addition product of propylene oxide and ethylene oxide to sorbitol. CONSTITUTION:A sorbitol derivative obtd. by adding 1-4mol of propylene oxide and 0-20mol of ethylene oxide to 1mol of sorbitol and esterifying 1mol of the resulting adduct with 1-2mol of a 10-23C fatty acid such as stearic acid or palmitic acid, is used. 0.5-30pts.wt. said sorbitol derivative is blended with 100pts.wt. thermoplastic resin such as vinyl chloride resin, and the mixture is molded (e.g. into a film) to obtain an antifogging thermoplastic synthetic resin molding.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermoplastic synthetic resin molded product with excellent antifogging properties and ease of access, and more specifically, to a novel thermoplastic synthetic resin molded product that is useful in fields such as agriculture, horticulture, and food packaging. The present invention relates to a thermoplastic resin molded product containing an anti-fogging agent made of a sorbitol derivative and having excellent anti-fogging properties, anti-fog properties, and durability thereof, particularly a soft vinyl chloride resin film.

Thermoplastic synthetic resins, such as films or sheets of vinyl or olefin thread resins such as polyvinyl chloride, polyvinylidene chloride, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, etc. (in this specification, films and sheets) Sheets (together referred to as films) are widely used as food packaging materials, agricultural materials, and other pipe materials. However, such thermoplastic synthetic resins are inherently highly hydrophobic, and when they are used, moisture condenses on the film surface becomes fine water droplets that cover the film surface and cause cloudiness, making it difficult to use. It is well known that this often causes trouble.

For example, when these films are used as covering materials for cultivated crops, water evaporates from the soil and condenses on the surface of the film, resulting in cloudy water droplets that prevent sunlight from passing through and cause damage to plants due to lack of light. This causes problems such as causing poor growth, causing water droplets to fall on the crop, damaging young shoots, and causing crop disease.

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 ester and diglycerin fatty acid ester (glycerin fatty acid ester) are kneaded into the film as an antifogging agent. There is.

In particular, it is used outdoors for long periods of time for agricultural purposes.
In this case, from the viewpoint of promoting the growth of crops and suppressing disease damage, a film that is suitable for use as an anti-fogging gauze and has as good an anti-fogging (wetting) property as possible is desired.

Therefore, in order to produce a heavy film with excellent disaster resistance and a long duration of 1fI, it is common to add a large amount of antifogging agent, or to use a combination of antifogging agents that migrate at different speeds from the inside of the film to the surface. , an attempt has been made to use the older sister. However, the former, that is, the addition of a large amount of anti-glare agent, not only avoids occasional troubles during the film forming process, but also reduces the film's opaqueness due to the inconvenient bleed, which is preferable for +D. It is impractical to increase the amount of ribs beyond a certain point, as this will produce undesirable results.As for the extreme cases, no anti-fogging agent has been found that is hypothetically effective. The current situation is.i?
! For example, in Japanese Patent Publication No. 48-81748, there is a description of vinyl chloride-based synthetic powder/[non-individual modified to be blended into a fat film]. i+
0.1 to 3 of propylene, butylene-4 or phenylene oxide to sorbitan fatty acid ester.
．． Compounds obtained by condensation of 0 moles have been proposed.

However, the degree of improvement is not necessarily satisfactory, and further improvement is desired.

In addition, Japanese Patent Publication No. 55-9431 discloses that an adduct of sorbitol with 1 to 20 moles of ethylene oxide having a carbon atom number of 1 to 20
It has been disclosed that an esterified product with 0 to 22 fatty acids is blended into a vinyl chloride polymer as an antifogging agent, but such an antifogging agent does not have a sufficient protective effect, and the antifogging property is particularly poor at low temperatures. Therefore, when a film containing this compound is spread on a greenhouse as an agricultural covering material, it is impossible to prevent the occurrence of fog inside the greenhouse.

Therefore, the present inventors have developed an anti-fogging agent that can be used in a wide range of fields in which anti-fogging properties are desired, and that exhibits excellent anti-fog and anti-fog effects and excellent sustainability. We have been conducting research on Eido in order to provide the following.

As a result, a divine sorbitol derivative, obtained by further esterification with fatty acids of the product prepared by adding propylene oxide and optionally ethylene oxide to sorbitol, has excellent wetting properties and its excellent durability. It imparts properties to thermal or plastic synthetic resin molded products, and also exhibits a fog-preventing effect and sustainability of the ## generation phenomenon in vinyl greenhouses for crops and cultivation, and has excellent initial anti-fog properties. It was also discovered that the material has high-temperature corrosion resistance and low corrosion resistance, and the present invention has been completed.

Thus, according to the present invention, an addition product of sorbitol with 1 to 4 moles of propylene oxide and 0 to 20 moles of ethylene oxide is added with 10 to 10 carbon atoms per mole of said addition product.
Provided is a thermoplastic synthetic resin molded article with excellent anti-fogging and anti-fog properties, which is characterized by containing a sorbitol derivative obtained by esterification with 1 to 2 moles of ~22 fatty acids. .

The thermoplastic synthetic resin film that has been antifogged according to the present invention is antifogged using a conventional sorbitan fatty acid ester or a reaction product of the ester and polyalkylene oxide, as shown in the Examples and Comparative Examples described later. It has much better anti-fog properties and durability than other thermoplastic synthetic resin films. It is extremely useful in practice as a commercially used material and food packaging material.

However, Japanese Unexamined Patent Publication No. 139555/1983 discloses that a boiled bean plastic synthetic resin film has excellent antifogging and antifogging properties. Sorbitol with ethylene oxide and propylene oxide is used as an antifogging agent that imparts properties and durability.
Anti-fogging agents have been disclosed in which the entire active ingredient is a reaction product between a monomer, a fatty acid such as stearic acid, and a monomer-based fatty acid such as adipic acid. Thermoplastic synthetic resin films generally have poor sealability with a cylindrical frequency sewing machine and low blocking resistance, which poses problems when used as agricultural covering materials.

On the other hand, the health-proofing thermoplastic synthetic resin film C1 provided by the present invention has extremely poor sealing properties and blocking resistance.

As mentioned above, the school preventive agent blended into the thermoplastic synthetic resin molded article of the present invention is composed of sorbitol and propylene oxide.
The product obtained by adding ~4 mol and 0 to 20 mol of ethylene oxide has roughly 10 to 2 carbon atoms.
The ringing component is a sorbitol derivative obtained by esterification with 1 to 2 moles of two fatty acids.

can be done. For example, this can be carried out by bubbling propylene oxide and optionally ethyleneoxy P into sorbitol while heating it to about 140 to about 150° C. in the absence of a solvent in an autoclave.

The addition reaction is usually carried out in the presence of an alkali catalyst, such as sodium hydroxide or potassium hydroxide, and once the desired number of moles of propylene oxide and ethylene oxide are injected, the bubbling is stopped and the reaction is continued with heating and stirring. Completed Zeshinuru. When ethylene oxide is added in addition to propylene oxide, there are no particular restrictions on the order in which they are blown into each other, and either one may be blown in first or both may be blown in at the same time.

9- As a result, a sorbitol-alkylene oxide addition product to which propylene oxide and ethylene oxide are added in amounts approximately equivalent to the 1 propylene oxide and ethylene oxide blown in is obtained.

The number of moles of propylene oxide added is in the range of 1 to 4 moles, and a range of 1 to 3 moles is particularly suitable. The number of moles of ethylene oxide added is in the range of 0 to 20 moles, with 0 to 5 moles being particularly suitable. When the number of moles of propylene oxide added is less than 1 mole and 4 moles,! When the ratio exceeds 1, there is a tendency for the antifogging property of the antifogging agent used to decrease at th. Furthermore, although it is possible to add 20 moles or more of ethylene oxide, it is not expected to improve the effects associated with this, and is of no practical use.

The addition product thus obtained may be purified by purification if necessary.
- Although it may be manufactured, it usually has 10 to 22 carbon atoms as it is.
esterified with several fatty acids. The vine fatty acids used in this esterification may be of either saturated or unsaturated type, such as capmargaric acid, stearic acid, petroselic acid, 7-octadecenoic acid, oleic acid, elaidic acid, linoleic acid, lyrinic acid, ricinoleic acid, isostearic acid, 12-hydroxystearic acid,
Examples include 12-ketostearic acid, nonadecanoic acid, behenic acid, brassic acid, erucic acid, etc., and these may be used alone or in combination of two or more kinds. Among these, preferred are those having 14 to 18 carbon atoms, particularly palmitic acid and stearic acid.

During the esterification reaction, 1 mole of the addition product
The host fatty acid is used in an amount of 1 to 2 moles. The esterification reaction of the fatty acid with the above addition product and the fatty acid is carried out by a method V known per se.
For example, the addition product is heated at about 200 to about 250° C. in the presence of a suitable esterification catalyst, such as p-toluenesulfone #sodium p-toluenesulfonate, maleic acid, 4cit rf&, etc. Esterification can be easily achieved by reaction with the fatty acid.

The sorbitol derivative thus obtained can be appropriately post-treated such as washing with water, and then added to a thermoplastic compound or resin as an antifogging agent according to the present invention.

The antifogging agent of the present invention has excellent protective properties and antifogging properties and can be used satisfactorily alone, but may also be used in combination with other known antifogging agents. This further improves anti-fog durability. Examples of antifogging agents that can be used in combination include the following. For example, sorbitan fatty acid esters such as sorbitan monostearate and sorbitan monopalmitate; diglycerin fatty acid esters such as diglycerin monopalmitate and zoglycerin monostearate; glycerin fatty acid esters such as glycerin monostearate; pentaerythritol monostearate, etc. Interaerythritol fatty acid esters; dipentaerythritol fatty acid esters such as diintererythritol mononoglumitate; sorbitan and diglycerin fatty acid/dibasic acid esters such as sorbitan monopalmitate/hephazyte, diglycerin monostearate/half glutamic acid ester, etc. and condensates of these with alkylene oxides such as ethylene oxide, propylene oxide, etc., such as polyoxyethylene-13-(2 moles) sorbitan monostearate, polyoxypropylene (2 moles) diglycerin monoglumitate; Polyoxyethylene fatty alcohols such as oxyethylene lauryl ether; polyoxyethylene fatty acid esters such as polyoxyethylene monostearate; and the like.

When the sorbitol derivative of the present invention is used alone as an antifogging agent, it is generally used in an amount of 0.5 to 10 parts by weight, preferably 1.0 to 25 parts by weight per 100 parts by weight of the thermoplastic synthetic resin. Can be mixed in proportions,
In addition, when used in combination with other antifogging agents as mentioned above, the sorbitol derivative is generally used in a range of 0.5 to 3.0 parts by weight, preferably 1.0 to 100 parts by weight of the thermoplastic synthetic resin in total with other antifogging agents. 0 to 25 parts by weight, in which case the sorbitol conductor accounts for 30 parts by weight of the total amount of the antifogging agent.
~100-jIt is desirable to occupy the IL strategy department.

14- Therefore, the sorbitol derivative of the present invention can be blended with various thermoplastic synthetic resins and molded into antifogging synthetic resin films and various other molded products desired to have antifogging properties. A molded article having excellent antifogging properties and durability thereof can be obtained.

When forming an antifogging synthetic resin film, 1gJ of a thermoplastic resin, which is a thermoplastic synthetic resin mixed with the antifogging agent of the present invention and optionally various additives, is used for any film forming method known per se. The antifogging synthetic resin film according to the present invention can be obtained by forming it into a film shape by means such as melt extrusion or calendering. The film thus obtained generally has a molecular weight of 50 to 200
It can have a thickness of μ.

Examples of thermoplastic synthetic resins used to form such films include polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, polyethylene, polyzolopyrene, polyester, polyamide, polymethyl methacrylate, polycarnate, and polyvinyl alcohol. , polyvinyl 1-tyral, polystyrene, polyacrylate and their tr#, compound vinyl-based synthetic resins; for example, vinyl petrified vinyl-vinyl acetate joint, vinyl chloride-ethylene joint joint, cylindrical vinyl Olefinic synthetic resins such as lupropylene copolymer, vinyl chloride-vinylidene chloride copolymer, vinyl chloride-acrylic acid ester copolymer, and mixtures thereof; e.g., ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer Examples include ethylene-butylene copolymer, ethylene-ethyl acrylate copolymer, etc.

1. In addition to antifogging agents blended with these thermoplastic synthetic resins.
Examples of processing agents include plasticizers, lubricants, antioxidants, (fr'@ inhibitors, heat stabilizers, ultraviolet absorbers, pigments, etc.) Examples of additive plasticizers include phthalic acid. Examples of the lubricant include sibutyl, dioctyl phthalate, diisodecyl phthalate, dioctyl adipate, zooctyl sepacate, tricresyl phosphate, butyl benzyl phthalate, epoxidized soybean oil, epoxidized mandarin oil, epoxy resin, etc. Examples of antioxidants include ethylene bissterylamide, butyl stearate, rough-in wax, low molecular weight polyethylene, montassic acid wax, stearic acid, and stearyl alcohol.
-Methylphenol, 2゜＼ 4.6-1-tert-butylphenol, 2.2'-methylenebis(4-methyl-6-tert-butylphenol) 44
Examples include #4'-thiosesu(3-methyl-6-tert-butylphenol) and phenyl α-naphthylamine.

17- In addition, as a thermal stabilizer, for example, polyoxyethylene alkylamide, ethanolamide F, alkyl phosphate, alkyl sulfate, etc. can be used, and as a heat stabilizer, for example, V-butyl tin ester, dibutyltin thaurate, calcium stearate, zinc ricinoleate, triphenylphospha.

Itoji temple is suitable.

Furthermore, the UV absorbers to be blended include, for example, hydroquinone-based ultraviolet absorbers such as hydroquinone and hydroquinone disalicylate; salicylic acid-based ultraviolet absorbers such as phenyl salicylate, and octylphenyl istylate; -hydroxy-4-methoxybenzophenone, 2-hydro/'-xy-4-'n-octoxybenzophenone, 2-hyV
Roxy 4-methoxy-2'-cardipenzophenone, 2,4-dihydroxybenzophenone 18-one, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2,2'-dihydrok-4 -methoxybenzophenone, 2-hydroxy-4-methoxy-5-
Benzophenone UV absorbers such as sulfone benzophenone, 2.2', 4.4'-tetrahydroxybenzophenone: 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2-(2'-hydroxy-5
'methylphenyl)-5,6-dichlorobenzotriazole, 2-(2'-hydroxy-5'-tart-butylphenyl)-5-alpenzotriazole, 2-(
2'-Hydroxy-3'-tert-butyl-5'-methylphenyl)-5-/lorpenzotriazole, 2-
(2'-hydroxy-3',5'-di,--trrtbutylphenyl)-5-chlorobenzotriazole, 2-
(2'-hydroxy-5'-phenylphenyl)-5-
Chlorbenzotriazole, 2- (2'-hydroxy-57-phenylphenyl)benzotriazole, 2-
(2'-hydroxy-5'-methylphenyl)-5,6
Examples include benzotriazole-based ultraviolet absorbers such as -dichlorobenzotriazole.

Further, examples of blended pigments include phthalocyanine blue, phthalocyanine green, l'l', '(l' titanium, chromophthal red, and sincasialet).

The 1tfi cloudy thermoplastic composite H, toilet oil film of the present invention is
For example, for agriculture and horticulture, 'Fj! It can be used for many purposes such as wearing, building materials, leisure, and market products. Especially,
Farm applications such as general industrial vinyl: For example, when used as a covering material for facility cultivation of agricultural products, clouding due to moisture evaporated from the cultivated crops and soil can be prevented, and structures can be used to prevent contamination from sunlight. It is good for growth, and there are few diseases caused by falling water droplets.

The antifogging agent made of the sorbitol derivative of the present invention can also be used for packaging purposes such as food packaging, for example, when used in packaging materials for foods containing moisture, such as fruits and vegetables, to prevent fogging due to moisture. Transparency can be maintained without clouding the packaging material. Alternatively, when fresh foods are packaged in a film and sold, they are placed in a low-temperature display case to maintain freshness, but if the antifogging agent of the present invention is added to this film, the moisture contained in the fresh foods can be reduced. It is possible to prevent the trouble of condensation on the film surface and cause fogging 9, and since the contents of the package can be confirmed, the display effect at the store can be improved.

The present invention will be further explained by examples, but the present invention is not limited only to the following examples. In the following examples, 1 part means part by weight unless otherwise specified.

-21 Example A (Production example of antifogging agent) Synthesis of stell 1 mol* of sorbitol (#F 11112) was dissolved in an autoclave, and a commonly used alkali catalyst Na
Addition reaction was carried out at 1.45 rc for 7 hours under the pressure of 1 mole of propylene oxide.

Next, polyoxypropylene (1 mol) and polyoxyethylene (
4 mol) Sorbitol 1 mol.

The thus obtained polyoxypropylene (1 mol), polyoxyethylene (5 mol), and 1 mol of sorbitol were added to the commonly used esterification medium para-toluenesulfone.
In the presence of fI/(0,02 mol) K1, x, f R IJ
yrl#! l! (J/F 284) 2 motor #20
Esterification reaction is carried out at 0° C. 22 − for 6 hours to obtain polyoxypropylene (1 morph polyoxyethylene (4 mol) sorbitol distearate).

Example B (Production example of antifogging agent) Synthesis of Stell Dissolve 1 mol of sorbitol in an autoclave, add 0,003 mol of commonly used alkali catalyst NaOH, and heat at 150°C for 6 hours under the pressure of 3 mol of propylene oxide. Perform an addition reaction.

Next, an addition reaction is carried out at 150° C. for 3 hours under the pressure of 3 moles of ethylene oxide to obtain polyoxypropylene (3 moles), polyoxyethylene (3 moles), and sorbitol.

The obtained polyoxypropylene (3 moles) polyoxyethylene (3 moles) and 1 mole of sorbitol are usually added to 1' for y.
Esterification catalyst para-toluene sulfone 110.
An esterification reaction was carried out with 17 stearic acid at 200° C. for 6 hours in the presence of 1.02 mol of polyoxyzolopyrene (3 mol), polyoxyethylene (3 mol), sorbitol monostearin L1. Obtain υ ester.

Synthesized sorbitol of Example C (Production example of antifogging agent) 1 mol of sorbitol was dissolved in an autoclave, and :I
...commonly used alkali catalyst KOII 0.003 mol 710. t, ti&irf ropyrene (MW 5831
Carry out the addition reaction between 7I# at 145°C under molar pressure.

Next, an addition reaction is carried out at 150° C. for 3 hours under the pressure of 5 moles of ethylene oxide to obtain polyoxypropylene (1 mole) polyoxyethylene (5 moles) and sorbitol.

The resulting polyoxypropylene (1 mol polyoxyethylene (5 mol, 1 mol of sorbitol, commonly used esterification catalyst), 0.0 radluenesulfonic acid
Using 3 moles, an esterification reaction is carried out with 2 moles of behenic acid at 200° C. for 6 hours to obtain polyoxypropylene (1 mole) polyoxyethylene (5 moles) sorbitol so-behenic acid ester.

Example D (Production example of antifogging agent) 1 mol of sorbitol was dissolved in an autoclave, 0.003 mol of alkali catalyst NaOH, which is commonly used, was added, and the mixture was heated under a pressure of 2 mol of propylene oxide under IC.

A force reaction was carried out at 145°C for 7 hours, and polyoxypropylene (2 mol) and sorbitol 1 mol were added.

-25- This polyoxypropylene (2 mol) was subjected to an esterification reaction with 1 mol of sorbitol and 1 mol of IC and palmitic acid at 200°C for 6 hours in the presence of 0.02 mol of para-toluenesulfonic acid, a commonly used esterification catalyst. to obtain polyoxypropylene (2 mol) sorbitol mono-palmitic acid ester.

Example E (Production example of antifogging agent) 1 mole of sorbitol was placed in bath M in an autoclave, 0.003 mole of commonly used alkaline catalyst HaOH was added, and addition reaction was carried out at 145°C for 7 hours under the pressure of 4 moles of propylene oxide. d.

Then under the pressure of 10 moles of ethylene oxide at 145°C for 3 hours
lJHt addition reaction is performed to obtain polyoxypropylene (4 moles) polyoxyethylene (10 moles) true 26-bitol. .

This polyoxypropylene (4 mol), polyoxyethylene (10 mol), 1 mol of sorbitol, a commonly used esterification catalyst, 0.02 luenesulfonic acid,
An esterification reaction is carried out with 2 moles of stearic acid at 200°C for 6 hours in the presence of 2 moles of stearic acid to obtain polyoxypropylene (4 moles), polyoxyethylene (10 moles), and sorbitol du stearate.

Example 1 and Comparative Examples 1 to 4 ・100 parts of polyvinyl chloride, sooctyl phthalate) 4
5 parts: C' poxidized soybean oil 2 parts, tricresyl phosphate 3 parts, barium stearate o, ss, zinc stearate) 1. ONS,) Riphenyl Phosphite 0
．． 5 parts and the polyoxypropylene obtained in Example A (
1 morph polyoxyethylene (4 moles) and 1.5 parts of sorbitol distearate were mixed. Next, the mixture was rolled to a thickness of 0.1 with a calender roll in a conventional manner.
A m/m film was created. What about the performance of this film? , in the second table.

For comparison, these tables also show the results of 11 determinations of the performance of a film prepared in the same manner as in Example 1, in addition to using the above-mentioned anti-sealing agent in place of the above-mentioned anti-staining agent of the present invention. is also shown.

1, t? +7 oxyethylene (5 mol) Sorbitol sosterolate 2 Polyoxyethylene (2 mol) Sorbitan monostearate 3 Polyoxypropylene (1 mol) Sorbitan monostearate 4 Sorbitan monostearate Example 2 In Example 1, the present invention 0.8 parts of antifogging agent.
A film was prepared in the same manner as in Example 1 except for using 7 parts of the known antifogging agent Tsuru V Tan monostearate.

The performance of this film is shown in Tables 1 and 2 below.

Example 3 In Example 1, the antifogging agent of the present invention obtained in Example B, polyoxypropylene (3 mol), polyoxyethylene (
A film was prepared in the same manner as in Example 1 using sorbitol monostearin (3 mol) ester.

The performance of this film is shown in Table PA1 and Table 2 below.

Example 4 In Example i, the same procedure as Example 1 was carried out except that the antifogging agents of the present invention obtained in Example C: polyoxypropylene (1 mol), polyoxy-29-oxyethylene (5 mol), and sorbitol dupehenic acid ester were used. A film was made in the same manner. The performance of this film is shown in Tables 1 and 2 below.

Example 5 A film was prepared in the same manner as in Example 1, except that the antifogging agent polyoxypropylene (2 mol) sorbitol monopalmitate of the present invention obtained in Example 1 was used. The performance of this film is shown in Tables 1 and 2 below.

Example 6 In Example 1, the present invention obtained in Example E.

A film was prepared in the same manner as in Example 1, except that 0.7 part of sorbitan monostearate was used in combination with the antifogging agents polyoxypropylene (4 mol), polyoxyethylene (10 mol), and 08 parts of sostearate. .

-30- The performance of this film is shown in Tables 1 and 2 below. The test methods and evaluations used to obtain the data shown in Tables 1 and 2 below are as follows.

(1) High-temperature anti-fogging property: 100 ee in wet water at 40°C
Place in a 200CC beaker, cover the opening of the beaker with film, and secure and seal with a rubber band and tape. This is fixed in a constant temperature bath at the same temperature and evaluated by observing the condensation state of the film after a certain period of 60 minutes.

(2) Low-temperature anti-fogging property: 20°C water 100%
The film is placed in a 00cc beaker, fixed in a constant temperature bath at 5°C, and evaluated by observing the condensation state of the film after a certain period of time (60 minutes).

The above high temperature and low temperature antifogging properties are evaluated using the following 10 ranks. The results are shown in Table 1. The larger the evaluation value, the better the antifogging properties.

Rank Evaluation: 10 Water droplet adhesion area on the inner surface of the film is less than 5% 9 Water droplet adhesion area on the film inner surface is 5% or more - l
Less than 0% 8 The water droplet sliding area on the inner surface of the film is 10% or more
Less than 20%7 Water droplet adhesion area on the inner surface of the film is 20% or more
Less than 30% 6 Smooth surface with water droplets on the inner surface of the film (30% on the side ~
Less than 40° 5 Water droplet layer area on the inner surface of the film is 40% or more
Less than 50% 4 Water droplet layer area on the inner surface of the film is 50% or more
Less than 60% 3 Water droplet layer area on the inner surface of the film is 60% or more
Less than 70%2 Water droplet adhesion area on the inner surface of the film is 70% or more
Less than 80% 1 Water droplet adhesion area on the inner surface of the film is 80% or more (3) Anti-repellent durability...Water 100ee to 200e
Place in an e-beaker, cover the beaker's mouth with a film, and secure and seal with a rubber band and tape. Fix the beaker so that the water surface height of the bathtub and the water surface height of the beaker are approximately the same. The temperature of the bathtub was maintained at 40° C. for 4 days, and the condensation state of the film was evaluated at a certain time using a cycle of heating for 1 day.

The above anti-fogging durability is evaluated using the following 10 ranks.

The results are shown in Table 1.

The higher the evaluation value, the better the anti-fog durability.

-33- 22 (4) Fog evaluation...Film layer height λTmm4
．． It was expanded into a pipe house with a height of 6.7 m, and the tip of the pipe was placed at a height of approximately 503 cm in the center of the house.

The solar light transmittance was measured using an Ike-type illuminance meter (manufactured by Tokyo Kogaku Kikai ■) as follows.

The solar transmittance inside the greenhouse was measured when evening curvature occurred, and the greenhouse was immediately ventilated to eliminate the fog, and then the solar transmittance was measured again. Table 2 shows the average passing rate for 3 days.

In addition, Table 2 shows the average fog occurrence time over a 5-day period based on Meiklls and M observations. The shorter the pestle generation time, the more the fog will disappear.

-35- 34- -36- -37- As is clear from the evaluation results of antifogging properties and durability shown in Table 1, the film to which the antifogging agent of the present invention has been added is superior to conventional antifogging agents. It can be seen that the antifogging property and the long-lasting effect are significantly superior to that of a film containing a certain sorbitan monostearate or its alkylene oxide adduct.

Further, as is clear from Table 2, in terms of expansion/suspension, the antifogging agent-added film of the present invention is superior in generating extremely less fog than the conventional antifogging agent-containing film.

As mentioned above, the films and lumens using the antifogging agent of the present invention have good antifogging effects, have unprecedented antifogging durability, and can be used as agricultural films for a continuous period of time. Moreover, since the generation of fog inside the greenhouse is extremely small compared to conventional films, it is good for suppressing diseases of agricultural crops, and its utility value is extremely large.

-38- Procedural amendment (spontaneous) December 13, 1980 Director of the Patent Office Kazuo Wakasugi 1, Incident indication, +1157 boat permit m120 (1282 No. 2, Title of invention Temporary-proof thermoplastic synthetic vehicle) UN molded product 3, relationship with the Nagisa case to be amended Patent applicant address Suekyo Iku Juyoda 1 Otomaru No. 85113 tJj+
4. Agent: 107 (and 2 others) (1) On page 11, line 6 of the specification, ``bendecanoic acid,'' is corrected to ``pentadecanoic acid,''.

(2) In the same page, page 18, line 10, the words ``no-idoquinone'' are corrected to ``r-hydroquinone''.

that's all 1-

Claims (1)

[Scope of Claims] An addition product of L sorbitol with 1 to 4 moles of propylene oxide and 0 to 20 moles of ethylene oxide, by esterification with 1 to 2 moles of a fatty acid having 210 to 22 carbon atoms per mole of said addition product. A thermoplastic synthetic resin molded article with excellent anti-fog and anti-fog properties, which contains the resulting sorbitol derivative. 2 Contains as an active ingredient a sorbitol derivative obtained by esterifying mHEa with 1 to 4 moles of propylene oxide and 0 to 20 moles of ethylene oxide of sorbitol with $1 to 2 moles of a fat having 10 to 22 carbon atoms. A protective agent characterized by.