JP3010506B2 - Antifogging composition for polyethylene resin film - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antifogging composition for a polyethylene resin film, and more particularly to a polyethylene resin film used for food packaging which is excellent at low temperature and has a long lasting property. The present invention relates to an antifogging composition for a polyethylene resin film, which can provide a certain antifogging effect.

[0002]

2. Description of the Related Art Synthetic resin films are widely used as food packaging films because of their excellent weather resistance, transparency, heat retention and strength. Usually, synthetic resin films have various problems when used as food packaging films due to their hydrophobicity. When a synthetic resin film is used for food packaging, if water-containing materials such as vegetables and meat are packed and stored particularly at a low temperature, the water condenses on the inner surface of the film to form water droplets. The formation of water droplets impairs the transparency of the film, the content cannot be seen through, and is not only unfavorable in appearance, but also degrades the image of the product. In order to solve such problems, there is a method for improving the properties of the film surface.

[0003] As a method for improving the properties of the film surface, there is a method of using a surface active substance such as a surfactant and applying it to the film surface, or a method of blending it with a synthetic resin to form a film. The surfactant used is called an antifogging agent. The method of applying an antifogging agent has a good initial antifogging effect and is an inexpensive method.However, if the antifogging agent is washed away by water condensed on the film, the part where the antifogging property cannot be obtained is obtained. There is. On the other hand, the method of kneading an antifogging agent into a synthetic resin to form a film is excellent in that a stable antifogging effect can be obtained over time. As the antifogging agent used in such a method, a method using a glycerin fatty acid ester (Japanese Patent Publication Nos. 38-4147 and 52-2653).
2), a method using fatty acid diethanolamide (JP-A-54-14452), a method using polyethylene glycol fatty acid ester (JP-B-39-21112), a method using glycerin fatty acid ester and fatty acid diethanolamide (JP-A-61-78854). ) Etc. are known.

[0004]

Problems to be Solved by the Invention The antifogging property required for a synthetic resin film used for food packaging must be excellent in low-temperature characteristics, high-temperature characteristics, recoverability, durability and the like. . In particular, anti-fogging properties (low-temperature characteristics and sustainability) when food is packaged and stored in a cold place for a long time are emphasized.

[0005] In order to exhibit sustained anti-fogging properties at low temperatures, it is necessary that the compounded anti-fogging agent has appropriate compatibility with the synthetic resin. When the compatibility is poor, the transfer speed (bleeding property) of the anti-fogging agent to the surface of the synthetic resin film is high, and although there is an anti-fogging effect, blocking of the films due to stickiness of the film surface occurs, resulting in poor workability and handleability. In addition, the antifogging agent separates inside the film, which impairs transparency. Conversely, if the compatibility is too good, the amount of the antifogging agent transferred to the film surface will be small, and the antifogging effect will not be exhibited.
Therefore, the antifogging agent has a suitable compatibility with the synthetic resin,
It must have a constant bleeding property over time.

[0006] In the conventionally known method in which glycerin fatty acid ester is used alone as an anti-fogging agent, the anti-fogging agent used does not have a sufficient balance between bleeding property and compatibility with the synthetic resin, resulting in low bleeding property. . For example, in this method, the antifogging agent has good compatibility with the synthetic resin and excellent transparency of the film, and the antifogging agent migrates to the film surface due to the heat history at the time of forming the film. Although the effect is recognized, the bleeding property is poor, so that a stable and stable antifogging property cannot be obtained especially at a low temperature. This tendency was particularly remarkable for polyethylene resin films among various synthetic resin films. The method using fatty acid diethanolamide is inferior in anti-fogging property, and the method using polyethylene glycol fatty acid ester is not only poor in anti-fogging property, but also unfavorable because the transparency of the film is reduced. Further, the method using glycerin fatty acid ester and fatty acid diethanolamide also has poor antifogging properties.

[0007] The present invention has been made in view of the above points, and uses a glycerin fatty acid ester, a fatty acid diethanolamide and a polyethylene glycol fatty acid ester at a constant ratio to maintain a polyethylene resin film at a low temperature. It is an object of the present invention to provide an antifogging composition for a polyethylene resin film, which can impart excellent antifogging property.

[0008]

[Means for Solving the Problems] That is, the present invention relates to (A).
Glycerin fatty acid ester, (B). Fatty acid diethanolamide and (C). (A) :( B) :( C) = 30-5 by weight% of polyoxyethylene fatty acid ester
This is an antifogging composition for a polyethylene resin film, which is contained at a ratio of 0:30 to 50:10 to 30.

As the glycerin fatty acid ester (A) used in the present invention, esters such as monoester, diester or triester of a fatty acid having 10 to 22 carbon atoms with glycerin can be mentioned. The fatty acid constituting the ester preferably has 10 to 22 carbon atoms in terms of antifogging property, and the glycerin ester of a fatty acid having less than 10 carbon atoms has poor compatibility with the resin and not only impairs the transparency of the film but also The glycerin ester of a fatty acid having more than 22 carbon atoms does not have sufficient anti-fogging properties and has a low initial anti-fogging effect. This has the disadvantage of impairing the processability and transparency of the film.

The fatty acids having 10 to 22 carbon atoms constituting the glycerin ester include lauric acid, myristic acid, palmitic acid, oleic acid, stearic acid, arachiic acid, behenic acid and the like. Among them, esters having 10 to 18 carbon atoms are particularly excellent and more preferable. In addition, glycerin and carbon number 10
Among the esters with 22 fatty acids, those containing at least 60% or more of a monoester are excellent in antifogging property and more preferable.

The fatty acid diethanolamide (B) used in the present invention includes an amide of a fatty acid having 10 to 22 carbon atoms and diethanolamine. The fatty acid constituting the diethanolamide preferably has 10 to 22 carbon atoms because of its excellent antifogging property, and the fatty acid has 10 carbon atoms.
If it is less than 1, the durability is poor, and if it exceeds 24 carbon atoms, the initial antifogging property is inferior, which is not preferable.

Examples of the fatty acids having 10 to 22 carbon atoms constituting diethanolamide include lauric acid, myristic acid, palmitic acid, oleic acid, stearic acid, arachinic acid, and behenic acid. Of these diethanolamides, Amides of fatty acids having 10 to 16 carbon atoms are more preferable in terms of anti-fogging property and are more preferable.

The polyoxyethylene fatty acid ester (C) used in the present invention is a monoester or diester of polyethylene glycol and a fatty acid having 12 to 22 carbon atoms, and ethylene oxide added to a fatty acid having 12 to 22 carbon atoms. The resulting ester and the like can be mentioned. The average molecular weight of the polyoxyethylene group constituting the ester is
200 to 600 are preferable as the polyethylene glycol. If the average molecular weight of the polyoxyethylene group is less than 200 as polyethylene glycol, the initial antifogging property is inferior,
If it exceeds 600, the transparency of the film is impaired, which is not preferable.

The fatty acid constituting the polyoxyethylene fatty acid ester (C) preferably has 12 to 22 carbon atoms because of its excellent antifogging property. These fatty acids include lauric acid, myristic acid, palmitic acid, oleic acid, stearic acid, arachiic acid, behenic acid and the like.

The antifogging agent composition for a polyethylene-based resin film of the present invention comprises the glycerin fatty acid ester of (A), the fatty acid diethanolamide of (B) and the polyoxyethylene fatty acid ester of (C) in weight% ( A):
(B): (C) = 30 to 50:30 to 50:10 to 30
It is preferable to include them in the ratio of The ratio between (A), (B) and (C) is such that when (A) is less than 30% by weight or more than 50% by weight, when (B) is less than 30% by weight or
If it exceeds 10% by weight, and if (C) is less than 10% by weight or more than 30% by weight, the antifogging properties are undesirably reduced.

The amount of the antifogging agent composition for a polyethylene resin film of the present invention is preferably 0.3 to 5% by weight based on the polyethylene resin. When the addition amount is less than 0.3% by weight, sufficient anti-fogging property is not exhibited.
Exceeding the weight percent is not preferred because the antifogging agent bleeds more than necessary and stickiness occurs on the film surface. The more preferable addition amount of the antifogging agent composition of the present invention is 0.5 to 2
Parts by weight.

The antifogging agent composition for a polyethylene resin film of the present invention is effective when kneaded into the polyethylene resin film. As the polyethylene resin, a polyethylene polymer or a copolymer with another monomer having ethylene as a main component (such as propylene, butene, and pentene), and a polyethylene polymer as a main component,
Resins obtained by mixing with other polymers are exemplified.

The antifogging agent composition for a polyethylene resin film of the present invention is kneaded when the polyethylene resin is processed into a film, or kneaded in advance at a high concentration with the antifogging agent composition to form master pellets. It can be diluted with a polyethylene resin and processed into a film for use. In the resin, additives such as a stabilizer, a lubricant, and an ultraviolet absorber may be used in combination.

The resin film containing the antifogging agent composition for a polyethylene resin film of the present invention can be produced by a conventional molding method,
For example, it can be manufactured by press working, injection working, blow working, inflation working, extrusion working, powder working, calendar working, etc., and is used in the form of a sheet, roll or bag.

[0020]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, which should not be construed as limiting the scope of the invention.

Examples 1 to 6, Comparative Examples 1 to 11 Polyethylene resin (UF421, manufactured by Mitsubishi Yuka Co., Ltd.) 100
The parts by weight were mixed with parts by weight of the antifoggant composition having the composition shown in Tables 1 and 2 and a small mixer (a die temperature of 170).
C) and pelletized with a pelletizer and dried. The pellets are formed on an inflation molding machine (die temperature 170
(° C.) to form a film having a thickness of 30 μm. The obtained film was stored in a thermo-hygrostat at 25 ° C. and 65% RH for 24 hours as a sample, and the antifogging property and the transparency were evaluated (implementation). Examples 1 to 6, Comparative Examples 1 to 10). The results are shown in Tables 1 and 2, and each test method is shown below. The antifogging agent composition of Example 2 and a polypropylene resin (manufactured by Mitsubishi Yuka Co., Ltd., Mitsubishi Noblen MA-4) were blended in the same manner as described above, processed into a film, and the performance due to the difference in the resin was also evaluated ( Comparative Example 11).

Test method for evaluating anti-fogging property A sample film was prepared by placing 150 ml of warm water at 40 ° C.
ml (80 mmφ) beaker, and stored in a thermostat at 5 ° C. for 3 days. During this time, the state of adhesion of water droplets on the inner surface of the film was observed over time to evaluate the antifogging property and its persistence. . Evaluation criteria A: No water droplets were observed, and transparency was good. ：: Large water droplets adhered to part, but transparent. Δ: Water droplets are considerably adhered and translucent. ×: Water droplets adhered to the entire surface and were opaque.

Transparency evaluation test method A sample film was observed and the transparency was evaluated. Evaluation criteria ○: The transparency of the film is good. Δ: Slight turbidity of the film. X: The film is turbid.

[0024]

[Table 1]

[0025]

[Table 2]

[0026]

The antifogging agent composition for a polyethylene resin film of the present invention contains a specific ratio of a specific glycerin fatty acid ester, a fatty acid diethanolamide and a polyethylene glycol fatty acid ester. The polyethylene resin film obtained in the above, at a lower temperature than those using a conventionally known anti-fog agent,
It has a long lasting and excellent antifogging property.

Claims (1)

(57) [Claims] (A). Glycerin fatty acid ester,
(B). Fatty acid diethanolamide and (C). Polyoxyethylene fatty acid ester in weight% (A):
(B): (C) = 30 to 50:30 to 50:10 to 30
The antifogging agent composition for polyethylene-based resin films characterized by containing in the following ratio.