JPH03212435A - polyolefin resin film - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a polyolefin resin film. Specifically, the present invention relates to a polyolefin resin film with excellent long-lasting antistatic effect.

[Conventional technology]

Polyolefin resin films have excellent electrical insulation properties, but on the other hand, they tend to be charged with static electricity, and therefore powder and dust tend to adhere to the film surface, reducing workability during film molding and reducing the film's commercial value. In order to improve these drawbacks, a method has been adopted in which an antistatic agent is added to the polyolefin resin in advance, the resin is kneaded, and then a film is formed.

[Problem to be solved by the invention]

However, polyolefin resin films containing antistatic agents are used for powder packaging materials such as medicine packaging materials, coffee powder bags, bonito tube bags, etc.
The antistatic effect cannot be sustained for more than several months, and there is a demand for improvement in this sustainability.

[Means to solve the problem]

The inventors of the present invention have made extensive studies to maintain the antistatic properties of the polyolefin resin film described above over a long period of time. The present invention was completed based on the discovery that the antistatic properties of the film can be significantly extended.

That is, the gist of the present invention is a film obtained by extrusion molding a polyolefin resin, which contains the following a.
The additives from ~d to the film thickness (μm) and a in the film
The product of -d and the total concentration of additives (6% by weight (hereinafter abbreviated as wt%)) is blended in a range of 4 to 10 (μm, wt%), and the quantitative ratio is a / b / c / d =
1/0.05~1/0.04~0.8/
A polyolefin resin film characterized in that the ratio is 0 to 1.

a Polyglycerol fatty acid ester CH20COR represented by general formula (I).

CHOH H2 CHOH CR20H (In the formula, R1 represents an alkyl or alkenyl group having 11 to 21 carbon atoms.) b Polyoxyalkylenealkylamine represented by the general formula (II) (In the formula, R2 represents an alkyl or alkenyl group having 8 to 22 carbon atoms. Represents a linear or branched alkyl group, oxyalkyl group, alkenyl group or oxydialkenyl group, R3 and R4 represent an alkylene group having 2 or 3 carbon atoms, m and n are m + n = 2 to 1
Represents an integer of 0. ) C higher aliphatic alcohol d Higher fatty acid glycerin ester represented by general formula (III) CHzOCORs CHOH... (III) H20H (wherein, R3 represents an alkyl group or alkenyl group having 11 to 21 carbon atoms ).

The polyolefin resins used in the present invention include ethylene or propylene homopolymers and ethylene-based copolymers, such as high-pressure low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, high-density polyethylene, polypropylene, and ethylene-propylene. Polymers, ethylene-butene-1 copolymer, ethylene-vinyl acetate copolymer, ethylene-(meth)acrylic acid copolymer, ethylene-(meth)acrylic acid ester copolymer, and the like. Furthermore, these polyolefin resins may be modified by graft reaction with an unsaturated carboxylic acid or its anhydride, such as maleic anhydride.

The physical properties of the polyolefin resin are not particularly limited as long as it is used for film forming.

The resin composition used in the present invention is one in which the polyolefin resin is combined with an antistatic agent of polyglycerin fatty acid ester, polyoxyalkylene alkylamine, and higher fatty acid glycerin ester, and a higher aliphatic alcohol is blended therein. used.

As the polyglycerol fatty acid ester (hereinafter referred to as component a), a compound represented by the following general formula (I) is used.

Chz　OCOR+ HOH CH.

HOH H20H (In the formula, R+ represents an alkyl or alkenyl group having 11 to 21 carbon atoms.) The above compounds include polyglycerin and 12 to 22 carbon atoms.
monoester compounds of saturated or unsaturated fatty acids, such as diglycerol monolaurate, diglycerol monomyristate, diglycerol monopalmitate, diglycerol monostearate, diglycerol monooleate,
Examples include diglycerol monolinoleate. These compounds can be used alone or in mixtures.

As the polyoxyalkylenealkylamine (hereinafter referred to as component), a compound represented by the following general formula (II) is used.

(In the formula, R2 represents a linear or branched alkyl group, oxyalkyl group, alkenyl group, or oxydialkenyl group having 8 to 22 carbon atoms, and R3 and R4 represent an alkylene group having 2 or 3 carbon atoms, m and n are m + n = 2~1
Represents an integer of 0. ) Examples of the compound represented by the general formula (n) include dodecyldioxyethylamine, TeI
・Labsyldioxyethylamine, octadecyldioxyethylamine, 16-oxyheptadecyldioxyethylamine, octadecyloxyoxyethoxyethylamine, 17-octadecyldioxyethylamine, 1
-Methylheptadecyldioxyethylamine and the like. These compounds can be used alone or as a mixture.

Further, as the higher aliphatic alcohol (hereinafter referred to as component C), an alcohol having 12 to 30 carbon atoms is preferably used. Examples of the higher aliphatic alcohol include lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, alkyl alcohol, behenyl alcohol, ceryl alcohol, coryanyl alcohol, and in particular stearyl alcohol, cetyl alcohol, myristyl alcohol, and lauryl alcohol. Alcohols having 12 to 20 carbon atoms are preferably used.

In the polyolefin resin film of the present invention,
It is desirable to add and use higher fatty acid glycerin ester represented by the following general formula (III) in combination with the three additives described above, as this further improves the antistatic effect of the film from the initial stage to the long term.

The above-mentioned higher fatty acid glycerin ester (hereinafter referred to as component d) has the general formula (I) CHzOCORs CHOH... (I[[) H2OH (wherein, R6 is an alkyl group or alkenyl group having 11 to 21 carbon atoms) ) is used. As the compound,
Monoester compounds of glycerin and saturated or unsaturated fatty acids having 12 to 22 carbon atoms, such as glycerin monolaurate, glycerin monomyristate, glycerin monopalmitate, glycerin monostearate, glycerin monooleate, glycerin monolinoleate, etc. can be mentioned. These compounds can be used alone or as a mixture.

The resin composition used in the present invention can be obtained by a method in which the above components are premixed and then kneaded, or by a method in which the above components are mixed and kneaded all at once. The mixing and kneading can be carried out using, for example, a ribbon blender, tumble mixer, Henschel mixer, etc., and the kneading can be carried out using an open roll, a panburi mixer, an axle screw extruder, a two-wheel screw extruder, a kneader, etc.

The polyolefin resin composition thus obtained is melt-extruded into a film by extrusion molding such as an inflation method or a T-die method, for example, at a temperature of 140 to 250°C. The film thickness is usually 10-200μ
m range.

4 above in the polyolefin resin film of the present invention
The amount (total) of the components is the product of the film thickness (μm) and the total concentration (wt%) of the above four components in the film, which is 4.
~10 (μm-wt%), preferably 6-8 (μm
-wt%), and the blending ratio of the above four components is component a/component b/component C/component d=110.0
5-110.04-0, 8/0-1, preferably 1
10.05~0.5/0°04~0.4/0~
It is in the range of 0.8. If the amount (total) of the above four components is less than the lower limit, the durability of the antistatic effect of the film will decrease,
On the other hand, if the amount exceeds the upper limit, a large amount of the additive will bleed onto the film surface, resulting in a decrease in adhesive strength when dry laminating or the like is performed, which is not preferable.

In addition, if the blending ratio of the above-mentioned components is less than the lower limit, the antistatic effect of the film and its sustainability will decrease, while if it is more than the upper limit, a large amount of the additive will bleed onto the film surface, and when dry laminating etc. are performed, This is not preferable because it causes a decrease in adhesive strength.

Furthermore, if the blending ratio of component C is less than the lower limit, the antistatic effect will not be immediate and the initial antistatic effect will be insufficient.On the other hand, if it is more than the upper limit, a large amount of the additive will bleed onto the film surface, resulting in dry lamination. This is not preferable because it causes a decrease in adhesive strength.

The above-mentioned component a has the effect of imparting long-term antistatic properties, and when used in combination with the above-mentioned components A and C, the antistatic effect can be balanced and imparted over a long period of time from the initial stage.

In addition, when the d component is added to the a''-C component and used in combination, the antistatic effect of the film can be further improved over a long period of time from the initial stage of the film.However, if the blending ratio is higher than the upper limit, the additive may be added to the film surface. This is not preferable because it bleeds in large quantities and reduces adhesive strength when dry laminating or the like is performed.

〔Example〕

The present invention will be explained in more detail below with reference to examples, but the present invention is not limited to these examples in any way unless it exceeds the gist thereof.

The physical properties in the examples were measured as follows.

fl) Surface specific resistance The surface specific resistance value of the film surface was measured using a super insulation resistance meter (manufactured by Ando Electric, model VMG-1000).

(2) Half-life of electrostatic voltage Statistic Charge the surface of the film at 1 QkV for 1 minute at a distance of 1 cm using a sonic honesty meter (manufactured by Otsuki Shokai).
The decay time (half-life) of the charged voltage was measured.

Example 1 High pressure process low density polyethylene (melt index 1.3
g/10 min, density 0.924 g/cIa), 0.02% by weight of octadecyldioxyethylamine (component B), 0.175% by weight of diglycerin monostearate (component C), and 0.0% by weight of stearyl alcohol (component C). A resin containing 015% by weight was inflation-molded at a resin temperature of 180° C., a blow-up ratio of 1.5, and a frost line height of 25 to obtain a film with a thickness of 30 μm. This product was stored in an atmosphere of 23°C and 65%, and after 3 days of molding,
After 2.5 months and after 4 months, surface resistivity and charging voltage half-life were measured.

The results are shown in Table 1.

Example 2 Diglycerol monostearate (component C) 0.
10% by weight, octadecyldioxyethylamine (component B) 0.02% by weight, stearyl alcohol (component C)
The same procedure as in Example 1 was conducted except that 0.15% by weight and 0.075% by weight of glycerin monostearate (component d) were added.

The results are shown in Table 1.

Comparative Examples 1 to 4 Comparative Examples 1 to 4 were conducted in the same manner as Examples 1 and 2, except that the amounts of additives were changed as shown in Table 1.

The results are shown in Table 1.

〔Effect of the invention〕

According to the present invention, a polyolefin resin film whose antistatic effect lasts for 4 months or more can be obtained, and can be used for medicine packaging materials and powder packaging materials.

Claims (1)

[Claims] (1) A film obtained by extrusion molding a polyolefin resin, in which the following additives a to d are added to the film thickness (μm) and the total concentration (wt%) of the additives a to d in the film. (abbreviated as wt%)) is 4 to 10 (μ
m. wt%), and the weight ratio is a
/b/c/d=1/0.05~1/0.04~0.8/
A polyolefin resin film characterized in that the ratio is 0 to 1. a Polyglycerol fatty acid ester represented by the general formula (I) ▲ Numerical formula, chemical formula, table, etc. are available ▼... (I) (In the formula, R_1 represents an alkyl or alkenyl group having 11 to 21 carbon atoms.) b General Polyoxyalkylenealkylamine represented by formula (II) ▲ Numerical formulas, chemical formulas, tables, etc. are available ▼... (II) (In the formula, R_2 is a straight or branched alkyl group having 8 to 22 carbon atoms, oxyalkyl group, alkenyl group or oxyalkenyl group, R_3 and R_4 represent an alkylene group having 2 or 3 carbon atoms, m and n are m+n=2 to 10
represents an integer. ) c Higher aliphatic alcohol d Higher fatty acid glycerin ester represented by the general formula (III) ▲ Numerical formulas, chemical formulas, tables, etc. are available ▼ ... (III) (In the formula, R_5 is an alkyl group or alkenyl having 11 to 21 carbon atoms (indicates the group)