JP2000169638A - Olefin resin composition - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To be excellent in the see-through feeling of a film, excellent in balance of physical properties such as transparency, appearance, blocking resistance, etc., and also excellent in secondary workability such as slipperiness, scratch resistance and roll stainability. And a film thereof. An olefin resin composition containing 0.01 to 2.0 parts by weight of an antiblocking agent (B) based on 100 parts by weight of the olefinic resin (A), wherein the antiblocking agent (B) is used. Has a weight average particle diameter of 1.5 μm or more.
The anti-blocking agent (B1) having a weight average particle size of 40 to 90% by weight and the anti-blocking agent (B2) having a weight average particle size of 4.0 to 7.0 μm and a weight average particle size of less than 0 μm. The content of particles having a particle diameter of 1.5 times or more the diameter is less than 10% by weight, and the difference between the weight average particle diameters of the anti-blocking agents (B1) and (B2) is 0.5 μm or more and 3.0 μm or less. Less than.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an olefin resin composition and a film thereof. More specifically, the present invention relates to an olefin resin composition containing an anti-blocking agent having a specific particle size distribution and a film thereof.

[0002]

2. Description of the Related Art Films made of olefin resins such as polyethylene and polypropylene are widely used for packaging foods, fibers, pharmaceuticals, fertilizers, miscellaneous goods, etc., and as agricultural coating materials. Such olefin resin films need to be improved in anti-blocking property in order to improve handling workability in film processing, printing process, bag making process, etc., and therefore silica, talc, zeolite, etc. And a lubricant such as an organic amide. However, when an anti-blocking agent is added to improve the blocking resistance of the film, the transparency of the film may be reduced and the appearance may be deteriorated, and the film surface may be damaged due to friction between the films during transportation and the like. In some cases. Further, when an anti-blocking agent and a lubricant are blended in order to improve the blocking resistance, contamination of the guide rolls may occur at the time of bag making or the printing process, which may cause a problem such as inferior secondary processing property. Have.

[0003] To improve the balance of various physical properties of a film in consideration of these secondary processing properties, see, for example, JP-A-7-258478 and JP-A-8-92428.
No. 6,086,045. JP-A-7-258478 discloses transparency, various physical properties such as blocking property, slip property, and the like.
Two types of anti-blocking agents are used to improve the secondary workability such as scratch resistance and roll contamination, and one of the anti-blocking agents is 1.5 times or more the average particle size of the anti-blocking agent. It is disclosed to use an anti-blocking agent in which the proportion of particles of a particle size is 10 to 40% by weight. Although the secondary workability is improved by this, one of various physical properties,
The see-through feeling, which is the flicker of the film, was not satisfactory. Japanese Patent Application Laid-Open No. 8-92428 discloses that
It is disclosed to use an anti-blocking agent having two or more maximum values and a difference between the maximum values is 3.0 μ or more. However, although the secondary workability is improved,
The perspective was not yet satisfactory.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a film having excellent transparency, excellent balance of physical properties such as transparency, appearance and anti-blocking property, and excellent properties such as slip property, scratch resistance and roll stain property. An object of the present invention is to provide an olefin-based resin composition having good secondary workability and a film thereof.

[0005]

Means for Solving the Problems As a result of intensive studies on the above problem, the present inventors have produced a film using an olefin resin composition containing a specific amount of an antiblocking agent having a specific particle size distribution. In such a case, it was found that a film having an excellent balance of physical properties such as a sense of see-through and excellent secondary workability was obtained, and the present invention was completed.

That is, the present invention relates to an anti-blocking agent (B) based on 100 parts by weight of an olefin resin (A).
An olefin resin composition containing 0.01 to 2.0 parts by weight, wherein the antiblocking agent (B) has a weight average particle diameter of 1.5 μm or more and less than 4.0 μm. 90% by weight and weight average particle size 4.0 μm
The anti-blocking agent (B2) 60 to
10% by weight, and the content of particles having a particle diameter of 1.5 times or more of each weight average particle diameter is 10%.
% By weight, the anti-blocking agents (B1) and (B
2) The difference in the weight average particle diameter is 0.5 μm or more and 3.0 μm.
m is related to the olefin resin composition. Further, the present invention relates to the olefin resin composition, wherein the fatty acid amide compound is contained in an amount of 0.4 part by weight or less based on 100 parts by weight of the olefin resin. Further, the present invention relates to a film comprising the olefin resin composition. Hereinafter, the present invention will be described in detail.

[0007]

DETAILED DESCRIPTION OF THE INVENTION The olefin resin of the present invention includes:
Examples include ethylene-based resins represented by polyethylene and ethylene-α-olefin copolymers, and propylene-based resins represented by polypropylene and propylene-α-olefin copolymers. Further, a copolymer with a polyunsaturated compound such as a conjugated diene or a non-conjugated diene is also included together with the α-olefin.

In addition to the above ethylene-α-olefin copolymer, ethylene and acrylic acid, methacrylic acid,
Copolymers of unsaturated carboxylic acids such as maleic acid and the like and esterified products thereof and acid anhydrides and copolymers of ethylene and vinyl esters such as vinyl acetate are also included. Propylene-based polymers are included as well as ethylene-based polymers.

Of these, ethylene resins are preferred, and ethylene homopolymers and ethylene-α-olefin copolymers are particularly preferred. The α-olefin is preferably an α-olefin having 3 to 10 carbon atoms, and the α-olefin content is preferably 0.5 to 30% by weight.
And more preferably 1.0 to 20% by weight. As density, preferably 0.880 to 0.970 g / cm
³ , more preferably 0.890 to 0.940 g /
cm ³ . The melt flow rate (MFR) is preferably 0.1 to 50 g / 10 minutes, and more preferably 0.2 to 20 g / 10 minutes.

Specifically, the ethylene-α-olefin copolymer includes ethylene-propylene copolymer, ethylene-butene-1 copolymer, ethylene-4-methylpentene-1 copolymer, ethylene-hexene- 1 copolymer, ethylene-octene-1 copolymer, ethylene-decene-1
Copolymers and the like, preferably ethylene-butene-1 copolymer, ethylene-4-methylpentene-1 copolymer, ethylene-hexene-1 copolymer, ethylene-octene-1 copolymer is there.

These ethylene resins may be used alone or in combination of two or more. From the viewpoint of transparency, a mixture of an ethylene-α-olefin copolymer and a high-pressure low-density polyethylene is particularly preferable.

The olefin resin of the present invention can be obtained by an ionic polymerization method or a coordination polymerization method performed in the presence of a Ziegler-Natta catalyst system, a metallocene catalyst system, a vanadium catalyst system, or the like, or a radical polymerization performed in the presence of a peroxide compound or the like. It can be obtained by a polymerization method or the like. Examples of the production method include a bulk polymerization method, a solution polymerization method, a slurry polymerization method, a high-pressure polymerization method, and a gas-phase polymerization method, and a bulk polymerization method, a solution polymerization method, a high-pressure polymerization method, and a gas-phase polymerization method are preferable.

An anti-blocking agent is one that can prevent mutual adhesion and fusion between olefin resins and prevent the olefin resins from becoming larger lumps. Is what is done. Particularly, it is possible to prevent mutual adhesion and fusion of the sheet-like and film-like olefin-based resins and further prevent the olefin-based resin from forming into a lump.

The anti-blocking agent (B) of the present invention comprises two components: an anti-blocking agent (B1) and an anti-blocking agent (B2).
It consists of different kinds of anti-blocking agents. The anti-blocking agent (B1) has a weight average particle diameter of 1.5 μm or more.
0 μm, preferably 2.0 μm to 3.5 μm
m, more preferably 3.0 μm or more and 3.5 μm or less. The content of the anti-blocking agent (B1) is 4
0 to 90% by weight.

On the other hand, the anti-blocking agent (B2) has a weight average particle size of 4.0 μm or more and 7.0 μm or less, and preferably 4.0 μm or more and 5.5 μm or less. The content of the anti-blocking agent (B2) is 60 to 10% by weight. (The sum of the proportions (% by weight) of the anti-blocking agents (B1) and (B2) is 100% by weight.)

Furthermore, in the anti-blocking agents (B1) and (B2), the weight-average particle diameter of each
The content of the particles having a particle diameter twice or more is less than 10% by weight, and the difference between the weight average particle diameters of the anti-blocking agents (B1) and (B2) is 0.5 μm or more and less than 3.0 μm, preferably It is 0.5 μm or more and 2.8 μm or less, and more preferably 0.5 μm or more and 2.5 μm or less.

The above anti-blocking agents (B1) and (B
When the weight average particle diameter of 2) is out of the above range, the film may have a poor perceived perceived flicker and may not be able to obtain a film having a good balance of appearance, transparency and blocking resistance. When the content of the particles having a particle diameter of 1.5 times or more of the respective weight average particle diameters in the anti-blocking agent (B1) or (B2) is 10% by weight or more, see-through which is a flicker of the film. In some cases, a film having poor appearance and excellent appearance and transparency may not be obtained.

Further, the anti-blocking agents (B1) and (B1)
When the difference in the weight average particle diameter of 2) is out of the above range,
If the difference is less than 0.5 μm, the particle size distribution in the anti-blocking agent (B) approaches the monodisperse distribution, so that the secondary workability such as roll stainability is inferior and the physical properties such as appearance and anti-blocking property are poor. However, there are cases where sufficient effects cannot be obtained. When the difference exceeds 3.0 μm, the perceived feeling, which is the flicker of the film, tends to be deteriorated, and the appearance and the transparency may be unfavorable.

The anti-blocking agent (B) has a content of particles having a weight average particle diameter of 15 μm or more in the anti-blocking agent (B) of 1.0% by weight or less, preferably 0.5% by weight. % Or less.

When the content of the particles having a particle size of 15 μm or more in the anti-blocking agent (B) exceeds 1.0% by weight, the improvement of the transparency, which is the flicker of the film, is not achieved, and the appearance and transparency are not achieved. May also be inadequate.

The above anti-blocking agents (B1) and (B
2) is preferably substantially spherical. When the anti-blocking agents (B1) and (B2) are not substantially spherical, the film is inferior in see-through feeling and scratch resistance, which are flickering, and has sufficient physical properties such as appearance, transparency, and secondary processing properties such as slipperiness. May not be obtained.

Here, the term "substantially spherical" means that the image observed by, for example, an optical microscope is photographed, the image is processed by an image analyzer, and is defined by a circularity coefficient S calculated by the following equation (1). You. S = 4π × A / L ² (1) (A: area of image, L: circumference) This circularity coefficient is close to 1 when the image is close to a circle. In the case of the above anti-blocking agents (B1) and (B2),
The circularity coefficient S is preferably 0.600 to 1.00. More preferably, it is 0.630 to 1.00. More preferably, it is 0.700 to 1.00.

The type of the anti-blocking agent used in the present invention is not particularly limited, and examples thereof include an inorganic anti-blocking agent and an organic anti-blocking agent. Examples of the inorganic anti-blocking agent include synthetic anti-blocking agents such as synthetic silica and crystalline or amorphous aluminosilicate powder. These may be those whose surfaces have been treated with a surface treatment agent such as a higher fatty acid such as stearic acid, a titanium coupling agent, or a silane coupling agent. Aluminosilicate is preferred from the viewpoint of the refractive index of the anti-blocking agent which affects the appearance of the film. Examples of the organic synthetic anti-blocking agent include powders of a crosslinked acrylic resin, a crosslinked polyethylene resin, a crosslinked polystyrene resin, a crosslinked silicone resin, a polyamide resin, a polyester resin, and the like. Among these, a powder of crosslinked polymethyl methacrylate is preferred. Similar to the inorganic anti-blocking agent, the organic synthetic anti-blocking agent may have its surface treated with a surface treating agent such as a higher fatty acid such as stearic acid, a titanium coupling agent, or a silane coupling agent. .

As these anti-blocking agents, those which meet the requirements of the present invention among commercially available products may be selected and used. Commercially available inorganic antiblocking agents include, for example, "Silton JC" (manufactured by Mizusawa Chemical Industry Co., Ltd.) and "SYL"
Commercially available organic anti-blocking agents such as "OSPHERE" (manufactured by Fuji Silysia Ltd.) include, for example, "Matsumoto Microsphere-M" (manufactured by Matsumoto Yushi Co., Ltd.) and "Julima MB-SX" (manufactured by Nippon Pure Chemical Co., Ltd.) , "Eposter MA"
(Manufactured by Nippon Shokubai Co., Ltd.).

The anti-blocking agent (B) composed of the anti-blocking agents (B1) and (B2) is obtained by mixing two kinds of anti-blocking agents (B1) and (B2). An anti-blocking agent, an anti-blocking agent containing a component corresponding to the anti-blocking agent (B1) and a component corresponding to the anti-blocking agent (B2) are exemplified.

The anti-blocking agents obtained by mixing as described above include organic anti-blocking agents, inorganic anti-blocking agents or a mixture of an organic anti-blocking agent and an inorganic anti-blocking agent. Specifically, a mixture of cross-linked acrylic resin powders, a mixture of cross-linked acrylic resin powder and cross-linked silicone resin powder as a mixture of organic anti-blocking agents, and a synthetic alumino as a mixture of inorganic anti-blocking agents. A mixture of silicate powders, a mixture of synthetic silicas, etc.,
Examples of the mixture of the organic antiblocking agent and the inorganic antiblocking agent include a mixture of a crosslinked acrylic resin powder and a synthetic aluminosilicate powder, and a mixture of a crosslinked acrylic resin powder and a synthetic silica.

The anti-blocking agent (B)
As an anti-blocking agent containing a component corresponding to 1) and a component corresponding to the anti-blocking agent (B2), when synthesizing and producing the anti-blocking agent, the particle size distribution corresponding to the anti-blocking agent (B1) and the anti-blocking agent Blocking agent (B
An anti-blocking agent whose particle size distribution is controlled so as to have a particle size distribution corresponding to 2) can be given.

The particle size distribution of the anti-blocking agent used in the present invention is measured by using a particle size distribution measuring device of Coulter counter method.

The mixing ratio of the anti-blocking agents (B1) and (B2) is (B1) 40 to 90% by weight, (B2) 60 to
10% by weight. (The sum of the ratios (% by weight) of (B1) and (B2) is 100% by weight.) When the ratio of the antiblocking agent (B1) is less than 40% by weight, the appearance of the film is deteriorated, and exceeds 90% by weight. In this case, the blocking resistance may be poor.

The proportion of the anti-blocking agent (A) composed of the anti-blocking agents (B1) and (B2) is 0.01 to 2.0 parts by weight, preferably 0 to 100 parts by weight, based on 100 parts by weight of the olefin resin. 0.05 to 0.6 parts by weight. If the proportion is less than 0.01 part by weight, the effect of improving the blocking resistance is poor, and if it exceeds 2.0 parts by weight, the optical properties may deteriorate.

The olefin resin composition of the present invention may contain a fatty acid amide compound. By using a fatty acid amide compound in combination, it is possible to further improve the slip resistance and the scratch resistance in addition to improving the blocking resistance.

When the fatty acid amide compound is contained, the amount of the fatty acid amide compound is preferably 0.4 parts by weight or less, more preferably 0.01 to 0.4 parts by weight, based on 100 parts by weight of the olefin resin. More preferably, 0.
It is 0.5 to 0.3 parts by weight.

Examples of the fatty acid amide compounds include saturated fatty acid amides, unsaturated fatty acid amides, saturated fatty acid bisamides, unsaturated fatty acid bisamides and the like. These may be used alone or in combination of two or more. Good.

Specifically, examples of the saturated fatty acid amide include palmitic acid amide, stearic acid amide, and behenic acid amide, and preferably stearic acid amide. Oleic acid amides as unsaturated fatty acid amides,
Examples thereof include erucamide, and oleamide and erucamide are preferable. Examples of the saturated fatty acid bisamide include ethylene bispalmitic acid amide, ethylene bis stearic acid amide, and hexamethylene bis stearic acid amide, and preferably ethylene bis stearic acid amide. Examples of the unsaturated fatty acid bisamide include ethylene bisoleic acid amide, hexamethylene bisoleic acid amide, N, N'-dioleyl sebacic acid amide, and preferably ethylene bisoleic acid amide.

The method for producing the olefin resin composition of the present invention is not particularly limited and any known method can be used. The method is obtained by uniformly melting and kneading the components used in the present invention. Can be For example, after mixing with a tumbler blender, Henschel mixer, etc., further melt kneading and granulating with a single screw extruder, a multi-screw extruder, or after melt kneading with a kneader or a Banbury mixer,
A method of granulating using an extruder and the like can be mentioned.

After the anti-blocking agent is melt-mixed with the olefin resin at a high concentration to form a master pellet,
The olefin-based resin composition of the present invention can also be obtained by blending the master pellet in a required amount with the olefin-based resin. Also, when a fatty acid amide compound is blended, the same method as described above can be adopted.

The olefin resin composition of the present invention may contain, if necessary, an antioxidant, an antistatic agent, a weathering agent, a UV absorber, and the like, as long as the object of the present invention is not impaired.
Known additives such as an anti-fogging agent and a pigment may be contained.

The film made of the olefin resin composition of the present invention can be obtained by an inflation processing method such as an air-cooled inflation molding method and a water-cooled inflation molding method. Film thickness is usually 5-200μ
m. The film may be formed by processing the olefin resin composition of the present invention alone to form a film or by laminating with another thermoplastic resin composition to form a film. When a film is formed by laminating, it is preferable that laminating is performed so that the layer made of the olefin resin composition of the present invention is on both sides or one side of the outermost layer.

Examples of the lamination molding method include a co-extrusion inflation molding method, a dry lamination molding method, and a sandwich lamination molding method.

The coextrusion inflation molding method is as follows.
This is a processing method in which the olefin resin composition of the present invention and another resin are coextruded, and a coextruded film having two or more layers can be obtained. Other resins that can be used in the coextrusion inflation molding method include, for example, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, polyamide, and polyester.

The dry lamination molding method or the sandwich lamination molding method is a process of laminating a film obtained by molding the olefin resin composition of the present invention alone or by coextrusion with another film or sheet. A laminated film or a laminated sheet can be obtained. Other films or sheets that can be used in the dry lamination molding method or the sandwich lamination molding method include, for example, stretched or unstretched polypropylene,
Examples thereof include films or sheets of polyester or polyamide, aluminum foil, cellophane, paper, and composite films or sheets thereof.

[0042]

EXAMPLES Hereinafter, the present invention will be described specifically with reference to Examples and Comparative Examples, but the present invention is not limited thereto. The materials used in this example and comparative examples are shown below.

(1) Olefin resin 1) PO-1 ethylene-butene-1 copolymer (manufactured by Sumitomo Chemical Co., Ltd.)
Sumikasen L FS150B, MFR = 0.8g / 1
0 min, d = 0.921 g / cm ³ ) 2) PO-2 polyethylene (Sumitomo Chemical Co., Ltd., Sumikasen F2)
00-0, MFR = 2.0 g / 10 min, d = 0.923
g / cm ³ ) PO-1 is produced by a gas phase ion polymerization method using a Ziegler catalyst, and PO-2 is produced by radical polymerization. MFR is 190 ° C,
2.Melt flow rate under 16 kg load condition (unit:
g / 10 minutes) and d indicates the density (unit: g / cm ³ ), which were measured according to JISK 6760.

(2) Anti-blocking agent component and anti-blocking agent The anti-blocking agents and anti-blocking agents used in the present Examples and Comparative Examples were used alone or in combination as shown below. 1) ABA-1 aluminum silicate powder (manufactured by Mizusawa Chemical Industries, Shilton J
C-30, weight average particle diameter = 3.2 μm, proportion of particles having a particle diameter of 1.5 times or more the average particle diameter = 6.6% by weight, proportion of particles having a particle diameter of 15 μm or more = 0 weight %, Circularity coefficient S = 0.747) 2) ABA-2 aluminum silicate powder (manufactured by Mizusawa Chemical Industries, Shilton J)
C-40, weight average particle diameter = 4.5 μm, proportion of particles having a particle diameter of 1.5 times or more the average particle diameter = 8.3% by weight, proportion of particles having a particle diameter of 15 μm or more = 0 weight %, Circularity coefficient S = 0.714) 3) ABA-3 aluminum silicate powder (manufactured by Mizusawa Chemical Industries, Shilton J)
C-50, weight average particle diameter = 5.3 μm, ratio of particles having a particle diameter of 1.5 times or more the average particle diameter = 9.8% by weight, ratio of particles having a particle diameter of 15 μm or more = 0. 4) ABA-4 crosslinked polymethyl methacrylate resin powder (Nippon Shokubai Co., Ltd., Eposter MA1004, weight average particle diameter = 4.0)
μm, the ratio of particles having a particle size of 1.5 times or more the average particle size = 9.6% by weight, the ratio of particles having a particle size of 15 μm or more = 0% by weight, and the circularity coefficient S = 0.939) 5) ABA-5 crosslinked polymethyl methacrylate resin powder (Nippon Shokubai Co., Ltd., Eposter MA1013, weight average particle size = 13.
5 μm, proportion of particles having a particle diameter of 1.5 times or more of the average particle diameter = 13.1% by weight, proportion of particles having a particle diameter of 15 μm or more = 42% by weight, circularity coefficient S = 0.728) 6) ABA-6 aluminum silicate powder (Sea Hostar K, manufactured by Nippon Shokubai Co., Ltd.)
E-P100, weight average particle size = 1.3 μm, ratio of particles having a particle size of 1.5 times or more the average particle size = 6.4% by weight, ratio of particles having a particle size of 15 μm or more = 0 weight %, Circularity coefficient S = 0.752) All of the above shapes 1) to 6) are spherical, and are monodisperse distribution antiblocking agents having only one maximum value (maximum value) in the particle size distribution based on weight. is there. The standard deviation of the particle size distribution is about 1 to 4 μm. 7) ABA-7 calcined kaolin powder (manufactured by Mizusawa Chemical Industries, Inc., Insulite MC-6, weight average particle diameter = 3.0 μm, ratio of particles having a particle diameter of 1.5 times or more the average particle diameter = 18. 7% by weight, proportion of particles having a particle size of 15 μm or more = 6.6% by weight, circularity coefficient S = 0.588) The shape of the above 7) is irregular, and the standard deviation of the particle size distribution is 6 to 8 μm. Is shown.

Production of anti-blocking agent master batch and blending of anti-blocking agent with olefin resin The anti-blocking agent master batch was prepared by mixing each anti-blocking agent with the same olefin resin as melt-kneaded.
It was prepared by melt kneading using a Banbury mixer in addition to a concentration of 1% by weight. When blending the antiblocking agent with the olefin resin, two or more masterbatches were mixed as required to satisfy the requirements of the present invention, that is, the ratio of each antiblocking agent.

Production of fatty acid amide compound masterbatch The fatty acid amide compound masterbatch is added to the same olefin resin as the olefin resin to be melt-kneaded at a concentration of 2.0% by weight and melt-kneaded using a Banbury mixer. It was manufactured by

The measurement of the performance in the examples and comparative examples was carried out by the following method. (1) Weight average particle size and particle size distribution Coulter Co., Ltd. Coulter counter model
The measurement was performed using TA-II with an aperture diameter of 20 to 200 μm and an electrolytic solution ISOTON II. (2) Circularity coefficient The method of calculating the circularity coefficient is described below. Observation was performed at 800 times with an optical microscope, an image in which 20 or more particles were captured was photographed, and the image was taken using an image analyzer (Image Analyzer V10 manufactured by Toyobo Co., Ltd.).
And the circularity coefficient S was calculated by the following equation (1). S = 4π × A / L ² (1) (A: image area, L: peripheral length)

(3) Haze (Transparency) The haze was measured in accordance with ASTM D1003-61. The smaller the value, the better the transparency. (4) LSI (perspective feeling) After conditioning the formed film at 23 ± 2 ° C. and 50 ± 5% RH for 24 hours or more, scattering of ± 0.4 ° to 1.2 ° by an LSI tester manufactured by Toyo Seiki Co., Ltd. The transmitted light was measured and used as a measure of the sense of transparency. The smaller the value, the better the perspective.

(5) Shear blocking After the molded film was conditioned at 23 ± 2 ° C. and 50 ± 5% RH for 24 hours or more, two molded films were superposed.
After adhering for 7 days in an oven adjusted to 40 ° C. under a load of 400 g / cm ² , the film adhering surface 50 cm ² was sheared with a constant crosshead speed tensile tester at a pulling speed of 200 mm / min. The maximum stress required for specific peeling was measured and used as a measure of blocking resistance. The smaller the value, the better the blocking resistance.

(6) Friction angle tan θ (slipperiness) A 160 mm (length) × 80 mm (width) sample film was placed on an inclined plate using a friction angle measuring device manufactured by Toyo Seiki Co., Ltd. 100mm (length) with film attached
A 1 kg thread of × 65 mm (width) was placed. The angle θ at which the sled started moving at an inclination rising speed of 2.7 ° / sec was measured and indicated as tan θ. The smaller the value, the better the slipperiness.

(7) Film Scratchability After conditioning the formed film at 23 ± 2 ° C. and 50 ± 5% RH for 24 hours or more, the two formed films are laminated, and one of them is made of a soft material such that the film is not damaged. The sample was attached without looseness or wrinkles on the top, and fixed on a shaker (sample for measuring scratchiness). The other was fixed via a stick made of silicon rubber stuck to a metal pipe, and the films were rubbed together for 1 minute under the conditions of an amplitude of 40 mm and a shaking speed of 60 times / min. AST for haze of molded film before and after rubbing
The measurement was performed in accordance with MD1003-61, and the difference was defined as ΔHaze, which was used as a measure of the scratch resistance of the film. The smaller the value, the better the scratch resistance.

(8) Roll Stainability A molded film obtained by the air-cooled inflation molding method is wound 400 m around a paper tube and conditioned in an oven adjusted to 40 ° C. for 3 days.
Using a 00 type slitter, rewinding was performed under the conditions of a line speed of 20 m / min and an unwinding brake force of 15 kg · m, and dirt on the guide roll was observed to determine the secondary workability. ◎: No dirt is seen on the guide roll. (Excellent secondary workability) ：: Slight dirt is seen on the guide roll, which is not a problematic range. (Good secondary workability) Δ: A range in which dirt is seen on the guide roll and becomes a problem. (Inferior in secondary workability) ×: Dirt is seen on the guide roll, and the dirt adhering to the roll is sometimes transferred to the film to cause a problem. (Very poor secondary workability)

(9) Visual Appearance Using a film obtained by the air-cooled inflation molding method, a plurality of panelists used to see through and flicker (5).
(Some grains of about 0 to 100 μm) were visually observed, and the overall appearance of the film was determined. The result of the judgment was used as a measure of the visual appearance. A: All panelists judged that the appearance was good.目: Almost all panelists judged that the appearance was good. (Good visual appearance) Δ: Except for some panelists, more than half of the panelists were judged unsatisfactory in appearance. X: All panelists judged dissatisfied with the appearance. (Very poor visual appearance)

(10) Overall Evaluation The performance of the film was visually classified into three stages with respect to the visual appearance of the film, the balance between the transparency and the blocking resistance, and the secondary workability. ：: Good balance between appearance and practical physical properties. Δ: The balance between appearance and practical physical properties is slightly poor. X: The balance between the appearance and the physical properties is poor, and cannot be put to practical use.

Examples 1 to 4 and Comparative Examples 1 to 6 Dry blending was carried out with the components and amounts shown in Tables 1 and 2 using a tumbler mixer, and a Placo blown film molding machine comprising a 50 mmφ single screw extruder was used.
At an extrusion rate of 25 kg / hr and a die set temperature of 200 ° C.,
A single-layer film having a thickness of 30 μm was obtained. The evaluation results of the obtained film are shown in Tables 3 and 4.

[0056]

[Table 1]---------------------------------------- −−−−−−−−−−−−−−−−−−−−−−−−− Mixing Olefin resin Type PO-1 PO-1 PO-1 PO-1 Amount used Part by weight 80 80 80 80 Type PO-2 PO-2 PO-2 PO-2 Amount used Parts by weight 20 20 20 20 Anti-blocking agent (B1) Type ABA-1 ABA-1 ABA-1 ABA-1 Weight average particle size μm 3.2 3.2 3.2 3.2 ≧ Ratio of 1.5 times particles wt% 6.6 6.6 6.6 6.6 Amount used Parts by weight 0.2 0.2 0.3 0.3 Antiblocking agent (B2) Type ABA-3 ABA-3 ABA-3 ABA-4 Weight average particle diameter μm 5.3 5.3 5.3 4.0 ≧ 1.5 times Particle ratio wt% 9.8 9.8 9.8 9.6 Amount used Parts by weight 0.1 0.2 0.1 0.05 Difference in particle size distribution based on weight μm 2.1 2.1 2.1 0.9 ≧ 15 μm Particle ratio wt% <0.1 0.1 <0.1 <0.1 Fatty acid amide compound used Amount Weight parts 0.22 0.22 0.22 0.22 ---------- -------------------

[0057]

Table 2 Comparative Example 1 2 3 4 5 5 6 6- −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− Formulation Olefin resin Type PO-1 PO-1 PO-1 PO -1 PO-1 PO-1 Used amount by weight 80 80 80 80 80 80 Type PO-2 PO-2 PO-2 PO-2 PO-2 PO-2 Used amount by weight 20 20 20 20 20 20 Anti-blocking agent (B1) Type-ABA-1-ABA-1 ABA-6 ABA-7 Weight average particle diameter μm-3.2-3.2 1.3 3.0 ≧ 1.5 times the proportion of particles wt%-6.6-6.6 6.4 18.7 Amount used Parts by weight-0.4- 0.3 0.3 0.2 Anti-blocking agent (B2) Type--ABA-3 ABA-5 ABA-3 ABA-2 Weight average particle size μm--5.3 13.5 5.3 4.5 ≧ 1.5 times the ratio of particles wt%--9.8 13.1 9.8 8.3 Used Amount Part by weight--0.4 0.1 0.1 0.3 Difference in average particle size based on weight μm---10.5 4.0 1.5 ≥15μm Ratio of particles wt%-0 0.2 10.5 <0.1 2.7 Fatty acid amide compounds used amount parts by weight 0.22 0.22 0.22 0.22 0.22 0.22 ------------------------------------

[0058]

Table 3 -------------------------------------------------------------------------------------------------------- Example 1 2 3 4 -------------------------------------------------------------- −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− Haze% 4.8 4.8 5.1 5.0 LSI% 8.8 9.8 8.9 7.7 Shear blocking g / 50 cm ² 760 710 690 690 710 Friction Angle (tan θ) 0.17 0.17 0.14 0.14 Scratching property ΔH% 2.7 5.4 3.6 0.9 Roll stainability ○ ○ ○ ○ Visual appearance ◎ ○ ○ ◎ Overall evaluation ○ ○ ○ ○ −−−−−−−−−−−−−−−− −−−−−−−−−−−−−−−−−−−−−−

[0059]

Table 4-----------------------------------------------------------Comparative examples −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− Haze% 3.4 4.9 5.0 5.3 6.2 5.7 LSI% 2.5 7.6 12 14 5.0 13 Shear blocking g / 50cm ² 1540 930 710 590 990 710 710 Friction angle (tan θ) 1.9 0.21 0.17 0.12 0.18 0.13 Scratchability ΔH%-1.6 8.3 1.8 4.1 4.2 Roll stainability-× ○ ○ ○ ○ Visual appearance ◎ ○ △ △ △ × Overall evaluation × × △ △ △ × −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

The films obtained by using the olefin resin compositions of the present invention shown in Examples 1 to 4 are excellent in the flickering perspective, excellent in the balance of physical properties such as appearance, transparency and anti-blocking property, and excellent in slip. Good secondary workability such as resistance, scratch resistance and roll stainability. On the contrary,
Comparative Examples 1 and 2 have good appearance, but have poor blocking resistance and slipperiness, and cannot be put to practical use. Comparative Example 2 also has poor roll stainability. Comparative Examples 3, 4, and 6 have a high LSI and have a poor perceived feeling of film flicker. Comparative Example 3 also has poor scratch resistance. In Comparative Example 5, the transparency and the blocking resistance were not satisfactory. As described above, the films shown in the comparative examples are inferior in the balance of various physical properties, and the secondary workability is not satisfactory.

[0061]

As described above, according to the present invention, the film is excellent in the balance of physical properties such as the see-through feeling, appearance, transparency, and blocking resistance, which are flickering, and has good slipperiness, scratch resistance and roll stain resistance. Thus, an olefin-based resin composition having an excellent balance of secondary workability and the like can be provided. In addition, the present invention can provide a good film because it has the above excellent properties. Further, the film of the present invention, by taking advantage of its excellent properties, is optimally used as a packaging material for foods, fibers, pharmaceuticals, fertilizers, miscellaneous goods, industrial parts, and the like, and as an agricultural coating material and an architectural coating material. Can be used.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) C08L 101: 00)

Claims (8)

[Claims] An olefin resin composition containing 0.01 to 2.0 parts by weight of an anti-blocking agent (B) based on 100 parts by weight of the olefin-based resin (A). ) Has a weight average particle diameter of 1.5 μm or more and 4.0.
40 to 90% by weight of anti-blocking agent (B1) less than μm
And an anti-blocking agent (B2) having a weight average particle diameter of 4.0 μm or more and 7.0 μm or less, which is 60 to 10% by weight,
In addition, the content of the particles having a particle diameter of 1.5 times or more of each weight average particle diameter is less than 10% by weight, and the difference between the weight average particle diameters of the anti-blocking agents (B1) and (B2) is: An olefin-based resin composition having a particle size of 0.5 μm or more and less than 3.0 μm. 2. The anti-blocking agent (B) has a thickness of 15 μm.
2. The olefin resin composition according to claim 1, wherein the content of the particles having the above particle diameter is 1.0% by weight or less. 3. The anti-blocking agent (B) content of 0.0
5 to 0.6 parts by weight, and an anti-blocking agent (B)
3. The olefin resin composition according to claim 1, wherein the content of the particles having a particle diameter of 15 μm or more is 0.5% by weight or less. 4. 4. The olefin resin composition according to claim 1, wherein the anti-blocking agents (B1) and (B2) are substantially spherical. 5. The anti-blocking agent (B1) has a weight average particle diameter of 2.0 to 3.5 μm, and the anti-blocking agent (B2) has a weight average particle diameter of 4.0 to 5.5 μm. The olefin resin composition according to any one of claims 1 to 4, characterized in that: 6. The olefin resin composition according to claim 1, wherein the olefin resin is an ethylene resin. 7. The olefin resin composition according to claim 1, wherein the fatty acid amide compound is contained in an amount of 0.4 part by weight or less based on 100 parts by weight of the olefin resin. An olefin-based resin composition. 8. A film comprising the olefin resin composition according to claim 1.