JP2000290436A - Polyolefin-based resin composition excellent in extrusion characteristic and molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a polyolefin-based resin composition having low extruding load in injection and hardly causing surface roughness and deterioration by adding a specified metal salt to a polyolefin-based resin as a molding modifier. SOLUTION: This composition is obtained by adding (B) 0.01-5 wt.% molding modifier consisting of a salt of (i) a 10-30C unsaturated aliphatic mono carboxylic acid with (ii) a group 1, 2, 12 or 13 metal having <40 atomic weight into (A) a polyolefin-based resin. As the component A, ethylene homopolymer, ethylene/3-20C α-olefin copolymer or the like is preferable. As the component i, undecylenic acid, elaidic acid, cetoleic acid, erucic acid, brassidic acid or the like is preferable. As the component ii, a group 1, 2, 12 or 13 metal having <40 atomic weight is preferable, lithium, sodium or aluminum is more preferable and lithium is furthermore preferable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyolefin-based resin composition having excellent extrusion characteristics during molding and obtaining a molded article having excellent product appearance and physical properties, and more particularly to an unsaturated fatty acid having 10 to 30 carbon atoms. Group 1, group 2, group 12 or group 1 of the periodic table having an atomic weight of less than 70
The present invention relates to a polyolefin-based resin composition containing 0.01 to 5% by weight of a salt with a Group 3 metal.

[0002]

2. Description of the Related Art Polyolefin resins have excellent processability, mechanical properties, electrical properties, chemical resistance, etc., and are therefore extruded products, injection molded products, hollow molded products, films, sheets, and the like. Processed into fibers, wire covering materials, etc., and used for various applications. However, polyolefin resin,
If molding is performed at a relatively high speed to increase productivity, the surface of the molded product is roughened, deterioration is promoted due to heat generation, the quality of the molded product is reduced, or the extrusion load during molding is reduced. In some cases, it became too large to perform the molding itself.

On the other hand, in order to improve the extrusion characteristics of the polyolefin resin, a method of using a polyolefin resin having a small molecular weight or a method of blending a polyolefin resin having a low molecular weight is generally used. However, when using a small molecular weight polyolefin resin,
When a low molecular weight polyolefin-based resin is blended, there is a problem that mechanical properties such as strength of a molded article are reduced.

Another technique for improving the extrusion characteristics of a polyolefin resin is to add a fluoropolymer to the polyolefin resin to improve the slipperiness between the resin and the inner wall of a molding machine (see Japanese Patent Application Laid-Open No. 3-505347). ) Has been proposed. However, this method has a problem that it takes a long time until the effect of improving the formability is obtained, and the effect is not sufficient.

[0005]

Therefore, development of a polyolefin-based resin composition which maintains a good mechanical property of the polyolefin-based resin, has a low extrusion load at the time of molding, and is unlikely to cause surface roughness and deterioration has been awaited. Was.

[0006]

Means for Solving the Problems The present inventors have found that the above objects can be achieved by adding a specific metal salt to a polyolefin-based resin as a molding / processing improver, and have completed the present invention. .

That is, the present invention relates to a salt of an unsaturated aliphatic monocarboxylic acid having 10 to 30 carbon atoms with a metal of Group 1, Group 2, Group 12, or Group 13 of the periodic table having an atomic weight of less than 70. , 0.01 to 5% by weight of the polyolefin resin composition.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. (1) Constituent components a) Metal salt of unsaturated aliphatic monocarboxylic acid The metal salt used in the polyolefin resin composition of the present invention is at least one kind of unsaturated aliphatic monocarboxylic acid having 10 to 30 carbon atoms as an acid component. And a metal component containing at least one metal of Group 1, 2, 12, or 13 of the periodic table having an atomic weight of less than 70, a single salt, a double salt, a complex salt, Any form such as a mixture thereof can be used. Of course, in preparing the metal salt, the acid component and the metal component may be used alone or in combination of two or more. The preparation method may be either a wet method or a dry method. Further, the mixing may be performed by a mechanical method after the preparation of the metal salt.

Examples of the unsaturated aliphatic monocarboxylic acids having 10 to 30 carbon atoms include undecylenic acid, oleic acid, elaidic acid, setreic acid, erucic acid, brassic acid, linoleic acid, linolenic acid, arachidonic acid, stearolic acid and the like. And preferably undecylenic acid, elaidic acid, setreic acid, erucic acid or brassic acid.
With other carboxylic acids, the effect of improving extrusion characteristics during molding is insufficient.

The first and second groups of the periodic table having an atomic weight of less than 70
Examples of the Group 12, 12 or 13 metal include lithium, sodium, magnesium, aluminum, potassium, calcium, zinc and the like, and preferably have an atomic weight of 40.
A metal belonging to Group 1, 2 or 13 of the Periodic Table, more preferably lithium, sodium or aluminum, and particularly preferably lithium. With other metals, the effect of improving extrusion characteristics during molding is insufficient.

Specific examples of the unsaturated aliphatic monocarboxylate used in the composition of the present invention include lithium undecylenate, lithium oleate, lithium elaidate, lithium setreate, lithium erucate, lithium brassinate, linoleic acid, and the like. Lithium, lithium linolenate,
Lithium arachidonate, lithium stearate, sodium undecylenate, sodium oleate, sodium elaidate, sodium cetoleate, sodium erucate, sodium brassic acid, sodium linoleate, sodium linolenate, sodium arachidonate, sodium stearate, Magnesium undecylenate, magnesium oleate, magnesium elaidate, magnesium setleate, magnesium erucate, magnesium brassinate, magnesium linoleate, magnesium linolenate, magnesium arachidonic acid, magnesium stearate, aluminum undecylenate, aluminum oleate, elaidin Aluminum silicate, aluminum cetreate, aluminum erucate, brush Aluminum phosphate, aluminum linoleate, aluminum linolenate, aluminum arachidinate, aluminum stearate, potassium undecylenate, potassium oleate, potassium elaidate, potassium settlenate, potassium erucate, potassium brassinate, potassium linoleate, linolenic Potassium acid, potassium arachidonic acid, potassium stearate, calcium undecylenate, calcium oleate, calcium elaidate, calcium setleate, calcium erucate, calcium brassic acid, calcium linoleate, calcium linolenate, calcium arachidonate, stearol Calcium acid, zinc undecylenate, zinc oleate, zinc elaidate, zinc setleate, zinc erucate, brassin Zinc, zinc linoleate, zinc linolenate, zinc arachidonic acid, stearolic acid and zinc. Among these, preferably, lithium elaidate, lithium setleate,
Lithium erucate, lithium brassic acid, sodium elaidate, sodium setleate, sodium erucate, sodium brassic acid, aluminum elaidate, aluminum setreate, aluminum erucate, aluminum brassate are used, and particularly preferred is lithium setreate. , Lithium erucate and lithium brassic acid are used.

A) Polyolefin Resin Examples of the polyolefin resin used in the present invention include polyethylene and polypropylene. As the polyethylene, ethylene homopolymer or a copolymer containing ethylene as a main component, for example, ethylene / α-olefin copolymer (α-olefin has 3 to 20 carbon atoms), ethylene / vinyl acetate copolymer, There are an ethylene / ethyl acrylate copolymer and an ethylene / methyl acrylate copolymer. Examples of the polypropylene include a propylene homopolymer or a copolymer containing propylene as a main component, for example, a propylene / ethylene block copolymer.
These may be used as a mixture of two or more. Also,
Polyethylene, polypropylene, etc. are mixed with ethylene / propylene copolymer rubber, ethylene / propylene / diene copolymer rubber, ethylene / butene copolymer rubber, etc.
It may be crosslinked as necessary and used as a thermoplastic elastomer.

Of these, ethylene homopolymer, ethylene / α-olefin copolymer (α-olefin having 3 to 20 carbon atoms), ethylene / vinyl acetate copolymer, propylene homopolymer, propylene -Ethylene block copolymer, ethylene-propylene copolymer rubber, ethylene-propylene-diene copolymer rubber, ethylene-butene copolymer rubber, or a mixture of two or more thereof is used. Among them, particularly preferred are an ethylene homopolymer and an ethylene / α-olefin copolymer (α-olefin has 3 to 20 carbon atoms).

Further, when the polyolefin resin is polyethylene, a composition satisfying the following properties (A) and (B) is optimal in terms of its effects. Characteristics (A) Mw / Mn is 1 to 4. (However, Mw represents a weight average molecular weight, and Mn represents a number average molecular weight.) Characteristics (B) MFR is 0.05 to 50 g / 10 min. That is, outside the above range, the effect of improving extrusion characteristics during molding is insufficient.

When the polyolefin-based resin is polyethylene, a resin composition for forming a film that satisfies the following properties (A) and (C) is most suitable in terms of its effects. Characteristics (A) Mw / Mn is 1 to 4. (However, Mw represents a weight average molecular weight and Mn represents a number average molecular weight.) Characteristics (C) MFR is 0.1 to 15 g / 10 min. That is, outside the above range, it is difficult to form a film, and the effect of improving extrusion characteristics is insufficient.

When the polyolefin resin is polyethylene, the resin composition for forming pipes, hollow molded articles, and covered electric wires that satisfies the following properties (A) and (D) is effective in terms of its effect. Optimal. Characteristics (A) Mw / Mn is 1 to 4. (However, Mw represents a weight average molecular weight, and Mn represents a number average molecular weight.) Characteristics (D) MFR is 0.05 to 5 g / 10 min. That is, outside the above range, it is difficult to form a pipe, a hollow, and an electric wire, and the effect of improving extrusion characteristics is insufficient.

C) Other compounding agents (optional components) The polyolefin-based resin composition of the present invention may contain a small amount of a resin other than the above-mentioned polyolefin-based resin within a range that does not significantly impair the effects of the present invention. Good or other additional components such as antioxidants, neutralizers, lubricants, antistatic agents, ultraviolet absorbers, light stabilizers, weathering improvers, plasticizers, nucleating agents, anti-condensation agents, molecular weight control An agent, a colorant, an impact modifier, a filler, a flame retardant, an adhesion improver, a printability improver, and the like can be compounded and used. Of course, you may mix and use the metal salt of a saturated fatty acid.

(2) Mixing ratio The salt of the unsaturated aliphatic monocarboxylic acid and a metal of Group 1, Group 2, Group 12 or Group 13 of the periodic table having an atomic weight of less than 70 is used in the present invention. It is used as a moldability improver, and its content is in the range of 0.01 to 5% by weight, preferably 0.05 to 3% by weight. If the content is less than the above range, the effect of improving the extrusion characteristics is insufficient, and if the content exceeds the above range, bleed out to the surface of the molded article becomes apparent, which is not preferable.

(3) Kneading and granulation The above-mentioned metal salt and polyolefin resin are blended in the above-mentioned blending ratio, and if necessary, other blending agents are added, followed by melt-kneading or dry blending, whereby the polyolefin-based resin of the present invention is obtained. A resin composition can be obtained. However, in the case of dry blending, it is preferable to adopt a master batch method for the metal salt and other compounding agents.

The above-mentioned melt kneading is generally carried out at a temperature of 170 to 250 ° C. by using a usual kneading machine such as a single screw extruder, a twin screw extruder, a Banbury mixer, a roll mixer, a Brabender plastograph, a kneader and the like. By suitably granulating, the polyolefin resin composition of the present invention can be obtained. In this case, it is preferable to select a kneading / granulating method capable of improving the dispersion of each component, and usually kneading / granulating is performed using a single-screw extruder or a twin-screw extruder.

(4) Molding The polyolefin-based resin composition of the present invention obtained as described above has excellent extrusion characteristics during molding, and a molded article having excellent product appearance and physical properties can be obtained. -It can be used for film and sheet applications where appearance such as gloss is required, as well as pipe applications where wrinkles on the molded product surface are problematic, and injection molding applications where flow mark is a problem.

Molding includes blown film molding,
Not limited to film forming such as T-die film forming, it can be processed into various containers, pipes, tubes, sheets, and the like by extrusion molding, hollow molding, injection molding, and the like. Furthermore, it can also be made into various composite films by extrusion coating or co-extrusion molding on other films, steel pipe coating,
It can also be used for applications such as wire coating or foam molding.

[0023]

The present invention will be described more specifically with reference to the following examples and comparative examples. The following Examples and Comparative Examples are for specifically describing the present invention. Therefore, the present invention is not limited by these Examples and Comparative Examples unless departing from the gist thereof.

The measuring methods and measuring conditions used in the following examples and comparative examples are as follows. (1) Melt flow rate (MFR) Based on JIS-K6760, under the conditions of 190 ° C. and 2.16 kg load when the polyolefin resin is polyethylene, and 230 ° C. when the polyolefin resin is polypropylene. , 2.16 kg load.

(2) Density Measured according to JIS-K6760.

(3) Ratio of weight average molecular weight to number average molecular weight (Mw / Mn) The value of Mw / Mn was determined based on "Gel Permeation Chromatography" by Takeuchi and published by Maruzen. That is, using standard polystyrene (monodisperse polystyrene manufactured by Tosoh Corporation) with a known molecular weight,
It was converted into a number average molecular weight (Mn) and a weight average molecular weight (Mw), and the value of Mw / Mn was determined. The measurement was performed using Waters's ISOC-ALG / GPC, three columns of AD80M / S manufactured by Showa Denko KK were used as columns, and the sample was dissolved in o-dichlorobenzene to prepare a 0.2% by weight solution as a 20% solution.
The procedure was performed at 140 ° C. at a flow rate of 1 ml / min using 0 μl.

(4) Resin pressure In the case where the polyolefin resin is polyethylene, the resin pressure is a die diameter of 75 mmφ and a die lip of 3 mm provided with an extruder having a screw diameter of 40 mmφ and L / D = 24. Using a blown film molding machine manufactured at a temperature of 160 ° C. and a screw rotation speed of 50 rpm
m, a blow-up ratio of 2.0, and a take-up speed of 20 m / min. The resin pressure at 30 minutes after the start of molding was read from a pressure gauge attached to the die portion, and the pressure was taken as the resin pressure of the raw material. . When the polyolefin resin was polypropylene, the measurement was performed in the same manner as in the case of polyethylene except that the temperature was changed to 190 ° C.

(5) Surface Smoothness The surface smoothness is determined by measuring the thickness of the resin formed at the time of measuring the resin pressure.
The surface condition of the μm blown film was visually observed, and its smoothness was evaluated in three steps as follows. ：: No occurrence of rough skin (very fine wrinkles or streaks) called sharkskin is observed. △: Some sharkskin is observed. ×: Sharkskin is clearly observed.

Production Example 1 (Preparation of Lithium Erucate) 62 g of lithium hydroxide monohydrate was dissolved in 1000 ml of water, placed in a 2000 ml autoclave equipped with a stirrer, 500 g of erucic acid was added, and the mixture was stirred. While heating at 130 ° C. for 2 hours to complete the reaction, the mixture was cooled to room temperature while stirring was continued, and the resulting precipitate was taken out and dried to obtain lithium erucate powder.

Production Example 2 (Preparation of sodium erucate) 62 g of sodium hydroxide was dissolved in 1000 ml of water, placed in a 2000 ml autoclave equipped with a stirrer, and 500 g of erucic acid was added. After heating for 2 hours to complete the reaction, the mixture was cooled down to room temperature while stirring, and the resulting precipitate was taken out and dried to obtain a powder of sodium erucate.

Production Example 3 (Preparation of aluminum erucate) 61 g of aluminum hydroxide was dissolved in 1000 ml of water, placed in a 2000 ml autoclave equipped with a stirrer, and 500 g of erucic acid was added. After heating for 2 hours to complete the reaction, the mixture was cooled to room temperature while stirring and then the resulting precipitate was taken out and dehydrated and dried to obtain aluminum erucate powder.

Example 1 A commercially available ethylene / hexene-1 copolymer produced by a metallocene catalyst (trade name "Kernel KF270";
A mixture prepared by adding 0.5% by weight of lithium erucate prepared in Production Example 1 to Nippon Polychem Co., Ltd.
The mixture was kneaded for 5 minutes using a roll kneader (roll interval: 0.3 mm) composed of two rolls having a diameter of 6 inches and set at a temperature of ° C., and the obtained sheet-shaped resin mass was granulated using a sheet pelletizer.

The pellets thus produced were measured for MFR, density and Mw / Mn in accordance with the above-mentioned measuring methods, and the results are shown in Table 1. In addition, the pellet was formed into an inflation film, and the thickness was 30 μm and the width was 230 m
m was obtained. The resin pressure at that time was measured according to the above-mentioned measuring method, and the surface smoothness of the film was evaluated.
The results are also shown in Table 1.

Example 2 A pellet was prepared in the same manner as in Example 1 except that the addition amount of lithium erucate was changed to 0.3% by weight.
The density, Mw / Mn, and resin pressure were measured, and the surface smoothness of the film was evaluated. The results are shown in Table 1.

Example 3 A pellet was prepared in the same manner as in Example 1 except that the addition amount of lithium erucate was changed to 0.1% by weight.
The density, Mw / Mn, and resin pressure were measured, and the surface smoothness of the film was evaluated. The results are shown in Table 1.

Example 4 A pellet was prepared in the same manner as in Example 2 except that sodium erucate obtained in Production Example 2 was used instead of lithium erucate, and MFR, density, Mw / Mn and resin pressure were measured. The surface smoothness of the film was evaluated, and the results were tabulated.
1 is shown.

Example 5 Pellets were produced in the same manner as in Example 2 except that the aluminum erucate obtained in Production Example 3 was used instead of lithium erucate, and MFR, density, Mw / Mn and resin pressure were measured. Then, the surface smoothness of the film was evaluated, and the results are shown in Table 1.

Example 6 A commercially available ethylene / hexene-1 copolymer produced by a metallocene catalyst (trade name "EXACT 2010";
EXXON CHEMICAL) was used in place of the metallocene polyethylene “Kernel KF270” in the same manner as in Example 2 except that MFR,
The density, Mw / Mn, and resin pressure were measured, and the surface smoothness of the film was evaluated. The results are shown in Table 1.

EXAMPLE 7 A commercially available terpolymer of ethylene / butene-1 / hexene-1 (trade name "EXAC") produced with a metallocene catalyst
T 3033 ", manufactured by EXXON CHEMICAL)
Was prepared in the same manner as in Example 2 except that was used in place of the metallocene polyethylene “Kernel KF270”, and MFR, density, Mw / Mn and resin pressure were measured, and the surface smoothness of the film was evaluated. Table 1 shows the results.
It was shown to.

Example 8 A pellet was prepared in the same manner as in Example 7 except that the amount of lithium erucate added was changed to 0.6% by weight.
The density, Mw / Mn, and resin pressure were measured, and the surface smoothness of the film was evaluated. The results are shown in Table 1.

Example 9 Ethylene butene-1 prepared with a metallocene catalyst
0.3% by weight of lithium erucate obtained in Production Example 1 and octadecyl-3 as an antioxidant were added to a copolymer powder.
0.05% by weight of-(3,5-di-t-butyl-4-hydroxyphenyl) propionate and 0.1% of tetrakis (2,4-di-t-butylphenyl) -4,4'-biphenylenediphosphonite. A mixture containing 0.05% by weight of calcium stearate and 0.05% by weight of calcium stearate as a neutralizing agent was added to the mixture using a 50 liter super mixer.
After mixing at a rotation speed of 800 rpm for 5 minutes, the mixture was melt-kneaded with a single screw extruder having a screw diameter of 40 mmφ and L / D = 26 at 200 ° C. and a screw rotation speed of 50 rpm to be pelletized. Using the pellets thus produced, MFR, density, Mw / Mn, and resin pressure were measured in the same manner as in Example 1, and the surface smoothness of the film was evaluated. The results are shown in Table 1. Was.

Example 10 Pellets were prepared in the same manner as in Example 9 except that the amount of lithium erucate added was changed to 0.8% by weight.
The density, Mw / Mn, and resin pressure were measured, and the surface smoothness of the film was evaluated. The results are shown in Table 1.

Example 11 A commercially available linear low-density polyethylene (ethylene butene-
1 copolymer) (trade name: Novatec LL F30F
G ", Nippon Polychem Co., Ltd.) was used in place of the powder of the ethylene / butene-1 copolymer produced with the metallocene catalyst, to produce pellets in the same manner as in Example 9, and MFR, density, Mw / Mn And measure the resin pressure,
The surface smoothness of the film was evaluated, and the results are shown in Table 1.

Example 12 A commercially available high-density polyethylene (trade name: Novatec HD
HY330B, Nippon Polychem Co., Ltd.) was used in place of the metallocene polyethylene “Kernel KF270” in the same manner as in Example 2, except that MFR,
The density, Mw / Mn, and resin pressure were measured, and the surface smoothness of the film was evaluated. The results are shown in Table 1.

Example 13 A commercially available propylene homopolymer (trade name: Novatec PP
FY6C ", Nippon Polychem Co., Ltd.) was used in place of the metallocene polyethylene" Kernel KF270 ", and pellets were prepared in the same manner as in Example 2. The MFR, density, Mw / Mn and resin pressure were measured, and the film pressure was measured. The surface smoothness was evaluated, and the results are shown in Table 1.

Example 14 A pellet was prepared in the same manner as in Example 13 except that the aluminum erucate obtained in Production Example 3 was used instead of lithium erucate, and MFR, density, Mw / Mn and resin pressure were determined. It measured and evaluated the surface smoothness of the film, and the result was shown in Table-1.

Comparative Example 1 Pellets were prepared in the same manner as in Example 1 except that lithium erucate was not added and roll kneading was not performed.
The density, Mw / Mn, and resin pressure were measured, and the surface smoothness of the film was evaluated. The results are shown in Table 1.

Comparative Example 2 A pellet was prepared in the same manner as in Example 2 except that a commercially available zinc stearate was used instead of lithium erucate.
MFR, density, Mw / Mn, and resin pressure were measured, and the surface smoothness of the film was evaluated. The results are shown in Table 1.

Comparative Example 3 Commercially available fluoropolymer processing aid (inorganic antiadhesive 1
0%) (Product name "Dynamer PPA FX-961
3 ", Sumitomo 3M) was used in place of lithium erucate, except that pellets were prepared in the same manner as in Example 2, and MFR, density, Mw / Mn and resin pressure were measured.
The surface smoothness of the film was evaluated, and the results are shown in Table 1.

Comparative Example 4 A pellet was prepared in the same manner as in Example 6 except that lithium erucate was not added and roll kneading was not performed.
The density, Mw / Mn, and resin pressure were measured, and the surface smoothness of the film was evaluated. The results are shown in Table 1.

Comparative Example 5 A pellet was prepared in the same manner as in Example 7 except that lithium erucate was not added and roll kneading was not performed.
The density, Mw / Mn, and resin pressure were measured, and the surface smoothness of the film was evaluated. The results are shown in Table 1.

Comparative Example 6 MFR, density, Mw / Mn and resin pressure were measured in the same manner as in Example 9 except that lithium erucate was not added, and the film surface smoothness was evaluated. Are shown in Table 1.

Comparative Example 7 Example 11 except that lithium erucate was not added.
MFR, density, Mw / Mn, and resin pressure were measured in the same manner as described above, and the surface smoothness of the film was evaluated. The results are shown in Table 1.

Comparative Example 8 Commercially available calcium behenate (trade name "CS-7",
MFR, density and Mw in the same manner as in Example 11 except that Koseisha Co., Ltd. was used in place of lithium erucate.
/ Mn and resin pressure were measured, and the surface smoothness of the film was evaluated. The results are shown in Table 1.

Comparative Example 9 Commercially available fluoropolymer processing aid (inorganic antiadhesive agent 1
0%) (Product name "Dynamer PPA FX-961
3 ", Sumitomo 3M Limited), except that lithium erucate was used in place of MFR,
The density, Mw / Mn, and resin pressure were measured, and the surface smoothness of the film was evaluated. The results are shown in Table 1.

Comparative Example 10 A pellet was prepared in the same manner as in Example 12 except that lithium erucate was not added and roll kneading was not performed.
R, density, Mw / Mn, and resin pressure were measured, and the surface smoothness of the film was evaluated. The results are shown in Table 1.

Comparative Example 11 A pellet was prepared in the same manner as in Example 13 except that lithium erucate was not added and roll kneading was not performed.
R, density, Mw / Mn, and resin pressure were measured, and the surface smoothness of the film was evaluated. The results are shown in Table 1.

[0058]

[Table 1]

From the above table, it can be seen that the following resin composition of the present invention has a low resin pressure at the time of molding and is excellent in extrusion characteristics, and the appearance of the molded product is excellent without generation of sharkskin and the like. .

[0060]

According to the present invention, there is obtained a polyolefin-based resin composition which is excellent in extrusion characteristics at the time of molding and is capable of obtaining a molded article having excellent product appearance and physical properties.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Katsura Noguchi 1150 Sezaki-cho, Soka City, Saitama Prefecture In-house (72) Inventor Tetsuya Ebisawa 1150 Sezaki-cho, Soka City, Saitama Prefecture F-term in-house (reference) 4F071 AA14 AA15 AA15X AA20 AA20X AA21X AA28X AA33X AA75 AA76 AA81 AA89 AC09 BA01 BB06 BC01 BC04 BC05 4J002 BB031 BB051 BB061 BB071 BB121 BB151 BP021 EG026 EG001

Claims (11)

[Claims] 1. A salt of an unsaturated aliphatic monocarboxylic acid having 10 to 30 carbon atoms with a metal of Group 1, Group 2, Group 12 or Group 13 of the periodic table having an atomic weight of less than 70, ~ 5% by weight
A polyolefin-based resin composition characterized by containing. 2. The polyolefin resin composition according to claim 1, wherein the metal is a metal belonging to Group 1, 2 or 13 of the periodic table having an atomic weight of less than 40. 3. The polyolefin resin composition according to claim 2, wherein said metal is lithium, sodium or aluminum. 4. The polyolefin resin composition according to claim 3, wherein said metal is lithium. 5. The polyolefin-based resin composition according to claim 1, wherein the carboxylic acid is undecylenic acid, elaidic acid, setleic acid, erucic acid or brassic acid. 6. The polyolefin resin composition according to claim 1, wherein the polyolefin resin is polyethylene. 7. The polyolefin resin composition according to claim 6, which satisfies the following properties (A) and (B). Characteristics (A) Mw / Mn is 1 to 4. (However, Mw represents a weight average molecular weight and Mn represents a number average molecular weight.) Characteristics (B) Melt flow rate (MFR) is 0.0
5 to 50 g / 10 min. 8. The polyolefin resin composition according to claim 7, which satisfies the following properties (A) and (C). Characteristics (A) Mw / Mn is 1 to 4. (However, Mw represents a weight average molecular weight and Mn represents a number average molecular weight.) Characteristics (C) MFR is 0.1 to 15 g / 10 min. 9. The polyolefin resin composition according to claim 7, which satisfies the following properties (A) and (D). Characteristics (A) Mw / Mn is 1 to 4. (However, Mw represents a weight average molecular weight, and Mn represents a number average molecular weight.) Characteristics (D) MFR is 0.05 to 5 g / 10 min. 10. A film formed from the resin composition according to claim 8. 11. A pipe, a hollow molded article or a covered electric wire formed from the resin composition according to claim 9.