JPH10237232A - Polyolefin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polyolefin composition suitable for a film excellent in transparency, slipperiness, scratch resistance, blocking resistance, antistatic properties and machine traveling. SOLUTION: This composition consists of 100 pts.wt. polyolefin, 0.01-1 pt.wt. spherical particles having a mean particle diameter of 0.5-7μm, 0.05-2 pts.wt. fatty acid diethanolamide represented by the formula (wherein R is a 5-21C alkyl, alkenyl, alkadienyl, alkatrienyl, or alkynyl; and (n) is an integer of 1 to 3), and 0.02-2 pts.wt. fatty acid ester of a polyhydric alcohol.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a polyolefin composition suitable for a film.

[0002]

2. Description of the Related Art The smoother the surface of a polyolefin film, the better its transparency and the better its appearance. However, on the other hand, the films are in close contact with each other and are likely to be blocked, and the slipperiness is also deteriorated, so that the suitability for secondary processing such as slitting, printing, and bag making is reduced.

In order to solve such a problem, a method of adding finely pulverized silica, zeolite or the like to a polyolefin film has conventionally been used. Recently, a method using a spherical organic polymer has also been proposed, and improvement in transparency and slipperiness has been attempted (Japanese Patent Laid-Open No. Hei 6-73202).

[0004]

However, in a polyolefin film containing spherical particles, the mechanical running property, especially the film surface of the anti-blocking agent at the time of secondary processing, is lower than in the case of using finely pulverized inorganic particles. There was a problem that the number of dropouts increased.

On the other hand, it is known that when a polyolefin film contains a fatty acid diethanolamide compound as an antistatic agent, a film having excellent antistatic properties and blocking resistance can be obtained. Then, when the fatty acid diethanolamide-based antistatic agent is further added to the one using spherical particles as the anti-blocking agent, the spherical particles fall off more intensely.

In view of the above background, the present invention is excellent in transparency, slipperiness, scratch resistance, blocking resistance, antistatic property, etc., and also excellent in machine running property. An object of the present invention is to provide a polyolefin film in which shedding is suppressed well.

[0007]

Means for Solving the Problems The present inventors have intensively studied to solve the above problems. As a result, they have found that the above problems can be solved by combining specific spherical particles with specific amide compounds and fatty acid ester compounds of polyhydric alcohols, and have completed the present invention.

That is, the present invention provides a) 100 parts by weight of polyolefin b) 0.01 to 1 part by weight of spherical particles having an average particle size of 0.5 to 7 μm c) 0.05 to 2 parts by weight of fatty acid diethanolamide d) A polyolefin composition comprising 0.02 to 2 parts by weight of a fatty acid ester of a polyhydric alcohol.

As the spherical particles used in the present invention, known particles can be used without any limitation as long as the average particle diameter is in the above-mentioned range. The average particle diameter is 0.000 in consideration of transparency, scratch resistance, blocking resistance, occurrence of peeling voids, and the like.
Those having a thickness of 5 to 7 μm, more preferably 1 to 5 μm can be suitably used. The size of coarse particles exceeding 10 μm by a Coulter Multisizer is preferably 5% by weight or less.
In particular, when the main component of the film is stretched with polypropylene, poor appearance is likely to occur due to generation of peeling voids.
Therefore, the spherical particles to be blended in such a case are preferably 5% by weight or less, more preferably 2% by weight or less, and more preferably 1% by weight or less of coarse particles exceeding 8 μm by a Coulter Multisizer. More preferred.

In the present invention, the term "spherical" means that the ratio of the minor axis to the major axis (minor axis / major axis) is 0.7 to 1, preferably 0.8 to 1, as observed by an electron microscope. Of course, the appearance,
In order to obtain a polyolefin film having good slipperiness and stretchability, it is most preferable that the spherical particles be substantially spherical.

In consideration of the transparency, blocking resistance, slipperiness, etc. of the film, the amount of the polyolefin film is 100 parts by weight of the polyolefin film.
It is necessary to be 0.01 to 1 part by weight, and 0.05
Preferably, the amount is 0.7 parts by weight.

As the spherical particles of the present invention, known particles can be used without any limitation as long as they have the above-mentioned properties.
Generally, inorganic oxides, organic polymers and the like can be mentioned.

The types of the inorganic oxide and the organic polymer are not particularly limited, but are generally easily available, have good dispersibility in polyolefin, and have a close refractive index value and do not hinder the transparency of the film. Is preferred. As such an inorganic oxide, in the present invention, silica,
A composite oxide containing silica as a main component, for example, 50 mol% or more, such as silica-alumina, silica-zirconia, and silica-titania, can be suitably used.

In order to impart particularly excellent sliding properties and scratch resistance, it is preferable to use a spherical molten inorganic oxide. The method for producing the spherical molten inorganic oxide is not particularly limited, but in particular, the inorganic compound synthesized by a known method such as a sol-gel method is heated at a temperature of 2000 to 3000 ° C., and the surface is melted and then cooled. Is preferable to obtain a film having good physical properties.

As the organic polymer, silicone resin particles, silicone rubber particles, polyamide particles, condensed resin particles having a triazine ring, cross-linked polystyrene particles, cross-linked polymethyl acrylate, cross-linked polymethyl methacrylate particles and the like are preferably used. Can be.

In particular, in order to impart excellent transparency to a polypropylene film, it is preferable to use crosslinked polymethyl methacrylate particles having a refractive index very close to that of polypropylene. The method for producing the crosslinked polymethyl methacrylate is not particularly limited, but a suspension polymerization, an emulsion polymerization, or the like is preferably used. In order to control the particle size distribution and to reduce coarse particles, classification is also used as necessary.

As the fatty acid diethanolamide used in the present invention, known fatty acid diethanolamides are used without any particular limitation.
Preferably, the following general formula (1)

[0018]

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(Wherein, R represents an aliphatic hydrocarbon group having 5 to 21 carbon atoms, and n represents an integer of 1 to 3). In the formula (1), R represents a group having 5 to 2 carbon atoms.
Although one aliphatic hydrocarbon group is used, those having 11 to 17 are more preferable. When the number of carbon atoms is larger than 5 and smaller than 21, the blocking of the polyolefin film becomes difficult, and the antistatic property of the polyolefin film also becomes good. Examples of the aliphatic hydrocarbon group include an alkyl group, an alkenyl group, an alkadienyl group, an alkatrienyl group, and an alkynyl group. Further, n in the formula (1) is from 1 to 3, and n = 1 is most excellent.

Specific examples of the fatty acid diethanolamide in the present invention include the following.

[0021]

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The fatty acid diethanolamide used in the present invention is 0.05 to 100 parts by weight of polyolefin.
It is necessary to contain 2 parts by weight, and preferably 0.1 to 1 part by weight. When the amount is less than 0.05 part by weight, the antistatic property of the film becomes poor, and when the amount is more than 2 parts by weight, the film is easily blocked, which is not preferable.

As the fatty acid ester of the polyhydric alcohol used in the present invention, glycerin fatty acid ester, sorbitan fatty acid ester, pentaerythritol fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyethylene glycol fatty acid ester, polyglycerin fatty acid ester and the like are used. In consideration of blocking properties, antistatic properties, etc., among them, glycerin fatty acid esters, sorbitan fatty acid esters, glycerin fatty acid esters, and the like, those based on polyhydric alcohols having 20 or less carbon atoms, preferably 10 or less are preferable. More preferred. The fatty acid ester of the polyhydric alcohol is preferably a fatty acid monoester. Further, as the fatty acid ester of the polyhydric alcohol, one in which at least one or more hydroxyl groups among a plurality of hydroxyl groups remain without being esterified is preferable in terms of effect. By using these polyhydric alcohol fatty acid esters, the film obtained in the present invention has less of the spherical particles falling off from the surface.

In the fatty acid ester of the polyhydric alcohol, the number of carbon atoms of the fatty acid is preferably from 6 to 22, considering the blocking property, antistatic property and the like, and is preferably from 12 to 22.
More preferably, it is 20. Examples of the aliphatic hydrocarbon group of the fatty acid include an alkyl group, an alkenyl group, an alkadienyl group, an alkatrienyl group, and an alkynyl group. Also, the number of carboxyl groups in the fatty acid is
One to three are used, but one is most preferred.

The fatty acid ester of the polyhydric alcohol of the present invention may contain other compounds to such an extent that the physical properties of the polyolefin composition of the present invention are not impaired. When a fatty acid monoester is used as the fatty acid ester of the polyhydric alcohol, the purity of the monoester is preferably 70% or more, more preferably 80% or more, in consideration of antistatic properties and the like. More preferably, it is 90% or more.

Specific examples of the fatty acid ester of the polyhydric alcohol in the present invention include glycerin monolaurate, glycerin monomyristate, glycerin monopalmitate, glycerin monostearate, glycerin monobehenate, glycerin monooleate, and glycerin. Glycerin fatty acid esters such as distearate; sorbitan fatty acid esters such as sorbitan monostearate and sorbitan monolaurate; and pentaerythritol fatty acid esters such as pentaerythritol monostearate.

The fatty acid ester of the polyhydric alcohol used in the present invention is used in an amount of 0.1 to 100 parts by weight of the polyolefin.
It must be contained in an amount of from 02 to 2 parts by weight, preferably from 0.1 to 1 part by weight. If less than 0.02 parts by weight,
If the amount of the antiblocking agent drops off, and if the amount is more than 2 parts by weight, it is not preferable because the film easily blocks.

The polyolefin in the present invention is not particularly limited, and a known one is used. For example, homopolymers of α-olefins such as ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, copolymers of the above α-olefins, A copolymer of a monomer other than the α-olefin copolymerizable with the olefin and an α-olefin, and a mixture thereof. Α copolymerizable with the above α-olefin
-Monomers other than olefins include vinyl acetate, maleic acid, vinyl alcohol, methacrylic acid, methyl methacrylate, ethyl methacrylate and the like.

The present invention relates to a resin which is particularly easily adhered to the above-mentioned polyolefins and is easily damaged on the surface, such as polypropylene, polyethylene, propylene-ethylene copolymer, ethylene-1-butene copolymer, ethylene-propylene. It is effective for one or a mixture of two or more polyolefins such as -1-butene copolymer and ethylene-propylene-butadiene copolymer. The melt flow rate of these polyolefins (hereinafter referred to as MFR
Is abbreviated as 0.1 to 5 in consideration of moldability and the like.
0 g / 10 min (230 ° C.) and 0.5 to 30 g
/ 10 min (230 ° C.).

The polyolefin composition of the present invention is not particularly limited and is used, for example, for injection molding, blow molding and extrusion molding. Among these, it is most preferable to use it as a sheet or film raw material in an extrusion molding application.

The film comprising the polyolefin composition of the present invention may be a single-layer film or a laminated film in which two or more resins having different properties are laminated. The thickness of the film is not particularly limited, but is generally from 10 to 200 μm, preferably from 10 to 100 μm.

In the case of a laminated film, various combinations of polyolefin forming each layer are used according to required performance. To give an example, the base material layer contains polypropylene having excellent mechanical performance among the above-mentioned resins, propylene-ethylene copolymer, ethylene-propylene-1-butene copolymer, and these polyolefins as main components. Using a blend, etc., the surface layer of polyethylene, propylene-ethylene copolymer, ethylene-
1-butene copolymers, ethylene-propylene-1-butene copolymers, ethylene-propylene-butadiene copolymers, and blends containing these polyolefins as main components can be used.

In the case of a laminated film, the composition of each layer containing the above-mentioned polyolefin as a resin component may be at least one layer as long as it is the composition of the present invention. Is preferably the composition of the present invention. At this time, the laminated film is manufactured with a structure in which only the spherical particles are blended in the outermost layer, and the fatty acid diethanolamide component and the fatty acid ester component of the polyhydric alcohol are blended in the inner layer such as the base material layer. The composition of the present invention may be transferred to the outermost layer by bleeding toward the outermost layer.

The method of forming a film is not particularly limited, and may be any method. Generally, powder or pellets of the raw material resin, the spherical particles,
After thoroughly mixing the fatty acid diethanolamide and the fatty acid ester of the polyhydric alcohol with powder or pellets of other resins, extruding, quenching on a temperature control chill roll and forming a film without stretching, or A uniaxial or biaxial stretching method is preferred. As an example of longitudinal uniaxial stretching, there is generally a method in which a film is passed between a roll rotating at the forefront at a low speed and a roll rotating at the rearmost at a high speed, and stretched at a rotation speed ratio of both rolls. On the other hand, as an example of the transverse uniaxial stretching, there is a tenter method. In addition, longitudinal and horizontal sequential biaxial stretching, simultaneous biaxial stretching, and the like can be performed by the methods described above. The stretching magnification is preferably 5 to 60 times, more preferably 20 to 50 times in area magnification.

Although the above is the case of the flat shape, in addition to this, the tube-shaped raw material can be stretched uniaxially, uniaxially and simultaneously biaxially by inflation. In this case, the raw material is heated to, for example, 80 to 150 ° C., and pressurized air is fed into the tubular film to form a film without stretching, or uniaxially stretching in the vertical or horizontal direction, or simultaneous biaxial in the vertical or horizontal direction. What is necessary is just to stretch.

[0036]

The polyolefin composition of the present invention, when processed into a film or the like, has excellent antistatic properties, transparency and scratch resistance due to the action of specific spherical particles, specific amides and fatty acid esters of polyhydric alcohols. Properties, blocking resistance and slipperiness. In addition, excellent mechanical running properties are realized, and in particular, falling off of the antiblocking agent during the secondary processing is significantly reduced. Accordingly, films made with such polyolefin compositions are, in particular,
It can be suitably used as a film for fiber packaging and cutting for which transparency and blocking resistance are required.

[0037]

EXAMPLES The present invention will be described below in more detail with reference to examples, but the present invention is not limited to these examples.

The physical properties of the films in the following Examples and Comparative Examples were measured by the following methods. The measurement was performed after the film was produced and after curing at 40 ° C. for 2 days.

(1) Appearance Judgment was made according to Table 1 by the number of peeling voids visually observed per m ^{2 of the} film.

[0040]

[Table 1]

(2) Transparency (haze value) Measured according to JIS K6714.

(3) Slipperiness The dynamic friction coefficient was measured according to ASTM-D-1894.

(4) Scratch resistance Two films cut into a size of 20 cm × 30 cm were overlapped, one was fixed below, and one was set above. Put a 4.6kg weight on the upper film and lower film and 10c
The contact was performed in an area of mx 10 cm, and the upper film was horizontally moved to rub two times between 20 cm. The haze was measured before and after the operation, and the difference was 0% or more to less than 3%, ○: 3% or more to less than 10%, X: 10% or more.

(5) Blocking property A piece of film of 4 cm × 30 cm was cut out and had a thickness of 3 mm.
It overlapped so that it might become. Film sample at temperature 3
After being left in an atmosphere of 0 ° C. and 70% RH for 24 hours, a pressure of 20 kg / cm ² was applied to the film sample for 30 seconds using a press machine. Thereafter, both ends of the film sample were fixed with jigs, and the bending strength was measured using an autograph (manufactured by Shimadzu Corporation).

(6) Antistatic Property (Surface Specific Resistance) The surface specific resistance of the film was measured according to JIS-K6911.

(7) Mechanical running property (Spherical particle detachability) Fusing seal bag making machine (manufactured by Kyoei Printing Machine Materials Co., Ltd .;
Film (80 type) at a speed of 25 m / min.
(0 mm width) and bag making. At this time, two black cloths of 5 cm × 60 cm in contact with the film (untreated surface of corona discharge) were wound around the folded portion of the film, and bag making was performed until the unwinding length of the film reached 2000 m. Was. The weight of the black cloth after bag making was measured, and the white powder adhered was removed by lightly tapping, and then the weight of the black cloth was measured. Evaluation was performed according to Table 2.

[0047]

[Table 2]

(8) Particle Size Distribution of Spherical Particles The particle size distribution (weight distribution) of the spherical particles was measured with a Coulter Multisizer, and the weight% of coarse particles having a particle size of 8 μm or more was measured.
I got

Examples 1 to 19 Polyolefins shown in Table 3, spherical particles shown in Table 4, fatty acid diethanolamide and fatty acid esters of polyhydric alcohols were added in the proportions shown in Table 4 and melt-kneaded. The ratio of the minor axis to the major axis (minor axis / major axis) of the used spherical particles observed by an electron microscope was 0.85 or more. The above resin was extruded from a T-die, and a stretched film was obtained by a biaxial stretching machine using a tenter method.

The appearance, transparency, slip properties, scratch resistance, blocking properties, antistatic properties and mechanical running properties of the obtained film were measured. The results are shown in Table 6.

Comparative Examples 1 to 6 Stretched films were obtained in exactly the same manner as in Example 1 using the polyolefins shown in Table 3, the spherical particles shown in Table 5, fatty acid diethanolamide and fatty acid esters of polyhydric alcohols. In addition, the ratio of the minor axis to the major axis (minor axis / major axis) of the used spherical particles observed by an electron microscope was 0.1 mm in each case.
It was more than 85.

The appearance, transparency, slip properties, scratch resistance, blocking properties, antistatic properties and mechanical running properties of the obtained film were measured. The results are shown in Table 7.

[0053]

[Table 3]

[0054]

[Table 4]

[0055]

[Table 5]

[0056]

[Table 6]

[0057]

[Table 7]

Claims (2)

[Claims] 1. a) 100 parts by weight of polyolefin b) 0.01 to 1 part by weight of spherical particles having an average particle diameter of 0.5 to 7 μm c) 0.05 to 2 parts by weight of fatty acid diethanolamide d) Polyhydric alcohol A polyolefin composition comprising 0.02 to 2 parts by weight of a fatty acid ester of 2. A film comprising the polyolefin composition according to claim 1.