JPH09286877A - Antifogging and antistatic polyolefin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a polyolefin resin excellent in antifogging properties and antistatic properties by mixing a specified glycerol monofatty acid ester with a diglycerol fatty acid ester, an alkyldiethanolamine in a specified mixing ratio. SOLUTION: This resin is obtained by adding 0.1-2wt.% mixture comprising 35-55 pts.wt. glycerol monofatty acid ester (the fatty acid is of 16-18C and has a 1-8C component content of 50wt.% or above) having a monoester content of 90% or above, 40-60 pts.wt. diglycerol fatty acid ester prepared by reacting 1mol of diglycerol with 1-1.5mol of a fatty acid being of 16-18C and having an 18C component content of 50wt.% or above and 3-10 pts.wt. alkyldiethanolamine having 16-18C alkyls and an 18C component content of 50wt.% or above to a pololefin resin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyolefin resin having excellent antifogging property and antistatic property.

[0002]

2. Description of the Related Art Generally, a polyolefin resin is a poor conductor of electricity, so once charged, the static electricity does not easily escape. The electrification phenomenon occurs due to friction or peeling, so that there are many obstacles due to electrification during processing of the polyolefin resin, and practically, static electricity tends to cause dust and dust to adhere to the polyolefin resin product, and there are many obstacles due to electrification. As a method for solving the drawbacks of this polyolefin resin, an antistatic agent such as alkyldiethanolamine, fatty acid diethanolamide and glycerin monofatty acid ester is used alone or as a mixture thereof. In addition, the surface of polyolefin resin is extremely hydrophobic so that it has excellent water resistance, but on the other hand, when water adheres to the surface because it is hydrophobic, the water does not show any wetting phenomenon on the resin surface. . This drawback appears, for example, when a polyethylene film or polypropylene film is used for packaging water-containing foods (fruits, vegetables, meats, etc.), condensed water adheres to the inner surface of the film, making the packaged foods difficult to see. As a method for solving this drawback, an antifogging agent such as sorbitan fatty acid ester or glycerin monofatty acid ester is used alone or as a mixture thereof.

[0003]

As described above, polyolefin resins are often required to have both antifogging properties and antistatic properties from a practical viewpoint. In this case, an antifogging agent and an antistatic agent are blended. Although attempts have been made to do so, the present situation is that no polyolefin resin product having excellent antifogging property and antistatic property has been obtained yet. Therefore, it is an object of the present invention to establish a polyolefin resin having excellent antifogging property and antistatic property.

[0004]

Means for Solving the Problems As a result of intensive studies for solving the above-mentioned problems, the present inventors have shown that the original properties of the resin are not impaired, the antifogging property is excellent in the durability and the antistatic property is also excellent. It has reached the invention of a polyolefin resin. That is, the present invention relates to (1) glycerin monofatty acid ester having a monoester content of 90% or more (provided that the fatty acid has a carbon number composition in the range of C _{16 to} C ₁₈ and a C ₁₈ content of 50% by weight or more) 35 ~ 55 parts by weight (2) Carbon number composition is C ₁₆ to C per mol of diglycerin
And diglycerol fatty acid esters 40 to 60 parts by weight of the C ₁₈ content is 1.0 to 1.5 moles react 50% or more by weight of fatty acids in the ₁₈ range (3) an alkyl group composition of C ₁₆ -C ₁₈ In the range and C ₁₈ content of 50% by weight or more alkyldiethanolamine 3
A polyolefin resin having excellent antifogging properties and antistatic properties, which is characterized by adding 0.1 to 1.5% by weight to a polyolefin resin of a mixture comprising 3 to 10 parts by weight. Is. That is, the composition according to the present invention has both performances as an antifogging agent and an antistatic agent. Hereinafter, the present invention will be described in detail.

In the present invention, the glycerin monofatty acid ester (1) is required to have a monoester content of 90% or more, and if less than 90% is used, the antistatic property is poor and it is not preferable. . Further, the carbon number composition of the fatty acid is in the range of C _{16 to} C ₁₈ and the C ₁₈ content of 50% by weight or more is an essential condition, and when a carbon number composition of C ₁₅ or less is used or the C ₁₈ content is If less than 50% by weight is used, the antifogging property lasts a long time.

The diglycerin fatty acid ester of (2) according to the present invention has a carbon number composition in the range of C _{16 to} C ₁₈ and a C ₁₈ content of 50% by weight with respect to 1 mol of diglycerin.
From the point of effect, it is necessary to be a compound obtained by reacting 1.0 to 1.5 moles of the above fatty acids, and especially when the number of moles of reaction of fatty acids exceeds 1.5 moles, the antifogging effect is inferior. ,
If the amount is less than 1.0 mol, the antifogging property, which is one of the objects of the present invention, is poor in sustainability, which is not preferable. Also, when a fatty acid having a carbon number composition of C ₁₅ or less is used or the C ₁₈ content is 5,
If less than 0% by weight is used, it is inferior in terms of sustaining antifogging property and antistatic property, which is not preferable.

The alkyldiethanolamine of the above (3) according to the present invention has an alkyl group composition of C ₁₆ -C _18.
Range, and the C ₁₈ content must be 50% by weight or more, and when C ₁₅ or less is used or when C ₁₈ content is less than 50% by weight, desired antistatic property is obtained. It is not preferable because it does not exhibit its properties.

As described above, the compound used in the present invention has C ₁₆ -C ₁₈ carbon atoms in both the glycerin monofatty acid ester (1), the diglycerin fatty acid ester (2) and the alkyldiethanolamine (3). And the C ₁₈ content is 50% by weight or more, and the mixture according to the present invention is (1) 35-55.
% By weight, (2) 40-60% by weight, (3) 3-10
It is indispensable to use the compounding ratio of wt% and forms the basis of the present invention. Although the reason why the mixture of the present invention has excellent antifogging property and excellent antistatic property has not been clarified,
It is considered that the mixture of the present invention acts on the surface of the polyolefin resin in a complicated manner to bring about a synergistic effect.

The addition amount of the mixture of the present invention to the polyolefin resin is 0.1 to 2.0% by weight, preferably 0.5 to 1.5% by weight, but if less than 0.1% by weight, it is desirable. The antifogging property and the antistatic property are not exhibited, and even if it is used in an amount of more than 2.0% by weight, the effect is not changed and it is not economically preferable.

Examples of the polyolefin resin according to the present invention include polypropylene, low density polyethylene, high density polyethylene, linear low density polyethylene and the like.

In the practice of the present invention, the addition of an antioxidant, an ultraviolet absorber, an anti-blocking agent, a slip agent, a pigment and the like, if necessary, does not hinder the present invention.

Also, the mixture according to the present invention may be used in combination with an antistatic agent such as alkyloyldiethanolamine or polyoxyethylenealkylamine or an antifogging agent such as sorbitan fatty acid ester, polyoxyethylenesorbitan fatty acid ester or glycerin fatty acid ester. Although the effect of the invention is not impaired, the effect beyond the present invention is difficult to be exhibited.

The present invention can be applied to processing methods which are usually used industrially, such as extrusion molding and injection molding.

[0014]

EXAMPLES Next, the present invention will be described with reference to examples, but the present invention is not limited to the following examples as long as the gist thereof is not exceeded.

Examples 1 to 8 and Comparative Examples 1 to 8 Polypropylene resin (Sumitomo Chemical, Sumitomo Noblen FL7
013), the mixture (A) to the mixture (H) according to the present invention in Table 1 was added at 1.0 PHR and kneaded, and then an inflation film of 50 μm was produced at an extrusion temperature of 210 ° C. with a 35 mm extruder. Similarly, a film was prepared in the case where the comparative compounds (I) to (P) other than the present invention in Table 2 were added, and the antifogging property and antistatic property were measured for each. The results are shown in Table 3.

[0016]

[Table 1]

[0017]

[Table 2]

[0018]

[Table 3]

Evaluation of Antistatic Property The produced film was subjected to 24 hours under the conditions of 20 ° C. and 65% RH.
After standing for a period of time, the surface resistivity was calculated using a super insulation meter manufactured by Kawaguchi Denki Seisakusho.

Evaluation of antifogging property I. Evaluation of wettability: The prepared film was put on an upper inclined box, and the wet state after 1 hour was observed at an outside air temperature of 5 ° C, a water temperature of 15 ° C, and an inclination angle of 10 °. II. Evaluation of sustainability: The prepared film was placed on the upper tilted box, and the wet state after 5 days was observed at an outside air temperature of 20 ° C., a water temperature of 40 ° C., and a tilt angle of 10 °. The evaluation of antifogging property was based on the following criteria. 5: No water droplets are observed. 4 ... A state in which a slight amount of water droplets is observed. 3 ... A state in which water droplets are recognized. 2 ... A state in which a considerable amount of water droplets are observed. 1 ... A state where water drops are attached to the entire surface.

[0021]

As shown in Table 1, the mixture (A) to the mixture (H) of the present invention is added in an amount of 0.1 to 2.0% by weight with respect to the polyolefin resin, whereby antistatic property and antistatic property are obtained. It is also possible to exert a very excellent effect on sustaining cloudiness.

Claims (1)

[Claims] 1. A glycerin monofatty acid ester having a monoester content of 90% or more (provided that the fatty acid has a carbon number composition in the range of C _{16 to} C ₁₈ and a C ₁₈ content of 50% by weight).
Above) 35 to 55 parts by weight (2) Carbon number composition is C ₁₆ to C per mol of diglycerin
And diglycerol fatty acid esters 40 to 60 parts by weight of the C ₁₈ content is 1.0 to 1.5 moles react 50% or more by weight of fatty acids in the ₁₈ range (3) an alkyl group composition of C ₁₆ -C ₁₈ In the range and C ₁₈ content of 50% by weight or more alkyldiethanolamine 3
A polyolefin resin having excellent antifogging properties and antistatic properties, which is characterized by adding 0.1 to 2.0% by weight to a polyolefin resin of a mixture comprising 3 to 10 parts by weight.