JPH1112403A - Polypropylene resin composition for masterbatch and extruded film made therefrom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a composition having excellent extrudability by mixing a crystalline polypropylene with a slip agent, an antiblocking agent and a diamine/monocarboxylic acid polycondensate or a diamine/monocarboxylic acid/polybasic acid polycondensate in a specified ratio. SOLUTION: This composition is prepared by mixing 100 pts.wt. crystalline polypropylene with 1.5-2.6 pts.wt. slip agent (e.g. higher fatty acid amide), 8.0-12.0 pts.wt. antiblocking agent (e.g. spherical organic inert substance having a mean particle diameter of 0.1-10 μm) and 8.0-16.0 pts.wt. a diamine (e.g. ethylene diamine)/monocarboxylic acid (e.g. stearic acid) polycondensate or a diamine/ monocarboxylic acid/polybasic acid (e.g. sebacic acid) polycondensate. Further, 95.0-97.5 pts.wt. syndiotactic polypropylene is mixed with 5.0-2.5 pts.wt. above composition, and the resultant mixture is molded by a T-die process to obtain an oriented film having a haze of 4.0 or below.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a polypropylene resin composition for a masterbatch and a film using the same. Specifically, a masterbatch polypropylene resin composition excellent in workability and dispersibility of an inert substance in a granulation process of a masterbatch, and further obtained by adding it to syndiotactic polypropylene, The present invention relates to a film which is excellent in moldability in a film forming process, has good optical properties such as transparency, flexibility, and feel, and has little fish eyes.

[0002]

2. Description of the Related Art Generally, isotactic polypropylene is used in a wide variety of fields because it is relatively inexpensive, has excellent rigidity and moldability, and has excellent appearance of molded articles. On the other hand, in recent years, J.I. A. A syndiotactic pentad fraction of 0.7 by a catalyst comprising a transition metal catalyst having an asymmetric ligand and an aluminoxane was reported by Ewen et al.
It has been found that a polypropylene having good tacticity can be obtained (J. Am. Chem.
Soc. , 1988, 110, 6255-6256).
Since the molded product of the syndiotactic polypropylene is excellent in transparency, flexibility, and touch, it is expected to be used for these characteristics.

However, syndiotactic polypropylene has a remarkably low crystallization speed and low crystallinity as compared with isotactic polypropylene, so that it has been difficult to mold. For example, the strands stick or sag when granulating, or the film wraps around a cooling roll when performing T-die extrusion,
Workability was inferior to isotactic polypropylene due to reasons such as the films sticking together. As an improvement method, various nucleating agents are added to increase the crystallization speed (Japanese Patent Laid-Open No. 3-54238).
A method for improving the granulation conditions (Japanese Patent Laid-Open No. 4-187407) has been proposed. When used as a film, a slip agent for improving the workability at the time of rewinding the film and an anti-blocking agent for preventing adhesion of the films after winding the film are added. Such slip agents and anti-blocking agents
It is publicly known that the film is added as a high-concentration masterbatch, and that the amount added is delicately changed to maintain the minimum physical properties as a film and to cope with various uses and seasonal effects.

[0004]

However, in a high-concentration masterbatch, the slip agent and the anti-blocking agent have a high concentration, so that the working environment is deteriorated due to smoking during production, and pellets are formed during granulation. When a high concentration of masterbatch is added to syndiotactic polypropylene, pinholes and fish eyes deteriorate the appearance, including its transparency, due to the increased amount of water adhering to the surface and the aggregation of inert substances. And other problems.

According to the present invention, a masterbatch which solves the conventional drawbacks described above, disperses the inert substance without deteriorating the working environment in the granulation process, and obtains a syndiotactic polypropylene can be obtained. By adding to, a polypropylene resin composition for a masterbatch that is excellent in moldability in the film-forming process, and which can provide a film having less fisheye with good optical properties such as transparency, flexibility, and touch. An object is to provide a film using the same.

[0006]

DISCLOSURE OF THE INVENTION The present inventors have solved the above-mentioned problems, and have found that a masterbatch for producing an extruded polypropylene film having good moldability, transparency, flexibility, and feel, and having less fish eyes. The present inventors have made intensive studies to develop a polypropylene resin composition and completed the present invention.

That is, according to the present invention, 100 parts by weight of crystalline polypropylene, and higher fatty acid amides as slip agents.
5 to 2.6 parts by weight, 8.0 to 12.0 parts by weight of a spherical organic inert substance as an antiblocking agent, diamine / monocarboxylic acid polycondensate or diamine / monocarboxylic acid / polybasic acid polycondensate It is a polypropylene resin composition for a masterbatch, which is blended with 8.0 to 16.0 parts by weight. In addition, the present invention provides a syndiotactic polypropylene of 95.0 to 97.5 parts by weight with respect to the masterbatch polypropylene resin composition of 5.0 to 2.0.
A haze value obtained by blending 5 parts by weight and extrusion molding is 4.0.
It is a flexible extruded polypropylene film having the following excellent transparency.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a polypropylene resin composition for a masterbatch of the present invention and an extruded polypropylene film using the same will be described in detail.

1. Polypropylene resin composition for masterbatch Each component of the resin composition of the present invention and a method for preparing the same will be described.

(1) Crystalline Polypropylene In the present invention, the crystalline polypropylene is not particularly limited as long as the polypropylene is crystalline, but the isotactic polypropylene has an isotactic pentad fraction measured by ¹³ C-NMR. Is preferably high stereoregularity of 0.80 or more, not only propylene homopolymer, but also propylene and ethylene or α having 4 or more carbon atoms.
-Copolymers with olefins can also be used. The content of ethylene or α-olefin having 4 or more carbon atoms as another olefin in the copolymer is preferably 6% by weight or less. ^{13C for} syndiotactic polypropylene
-A thing with high stereoregularity whose syndiotactic pentad fraction measured by NMR is 0.70 or more is preferable. Further, a mixture of isotactic polypropylene and syndiotactic polypropylene may be used. Particularly, when a copolymer of propylene and ethylene or syndiotactic polypropylene is mainly used, excellent physical properties can be obtained.

[0011] These polypropylenes are commercially available and many methods are known for producing various compositions and stereoregularities.

The catalyst used in the production of isotactic polypropylene or its copolymer is, for example, titanium trichloride or titanium tetrachloride on a carrier such as titanium trichloride catalyst or magnesium chloride known as Solvay catalyst. Or a metallocene catalyst typified by a combination of a diindenyl zirconium dichloride catalyst and a methylaminoxane cocatalyst. Conventional polymerization methods such as a solvent polymerization method using an inert solvent, a bulk polymerization method using substantially no inert solvent, and a gas phase polymerization method are used, and the polymerization temperature is -100 to 10
In general, the polymerization pressure is from 0 to 50 kg / cm ² -G at 0 ° C.

The catalyst used for producing syndiotactic polypropylene or a copolymer thereof includes:
In addition to the compounds described in the aforementioned documents, JP-A-2-413
03, JP-A-2-41305, JP-A-3-
JP 179005, JP-A-3-179006,
Examples of the catalyst include a crosslinked transition metal compound having asymmetrical ligands and a cocatalyst as described in JP-A-4-69394.
Even catalysts having different structures can be used as long as they can produce polypropylene having a syndiotactic pentad fraction of 0.7 or more as measured by ¹³ C-NMR.

Specific examples of the transition metal catalyst having an asymmetric ligand include isopropyl (cyclopentadienyl-1-fluorenyl) hafnium dichloride or isopropyl (cyclopentadienyl-1-yl) described in the above-mentioned literature. Fluorenyl) zirconium dichloride and the like. As the cocatalyst, aluminoxanes, particularly methylaminoxan, are preferably used.

The use ratio of the aluminoxane to the transition metal catalyst is 10 to 1,000,000 mole times, usually 50 to 100 moles.
5000 mole times. The polymerization conditions are not particularly limited, and a solvent polymerization method using an inert medium, a bulk polymerization method substantially free of an inert medium, and a gas phase polymerization method can be used. The polymerization temperature is generally -100 to 200 ° C, and the polymerization pressure is generally normal pressure to 100 kg / cm ² -G. Preferably, it is -100 to 100 ° C and normal pressure to 50 kg / cm ² -G.

The crystalline polypropylene having a relatively high molecular weight having a melt flow index measured at 230 ° C. of 0.01 to 100, preferably 0.05 to 50, has a high molecular weight in view of the physical properties of the extruded product. Is preferred.

(2) Slip agent The slip agent in the present invention is not particularly limited.
Higher fatty acid amides are commercially available, and include, for example, erucamide, oleic amide, stearic amide, and behenic amide. Erucamide is preferred in consideration of the slidability of the film over time and the rise.

The amount of the slip agent added is 1.5 to 2.6 parts by weight, preferably 1.6 to 2.5 parts by weight, based on 100 parts by weight of the crystalline polypropylene. If the addition amount is less than 1.5 parts by weight, the amount used when used as a masterbatch increases in order to obtain the slipperiness required for the film, and the workability deteriorates, which is not preferable. If the addition amount exceeds 2.6 parts by weight, smoke is generated during granulation of the master batch,
It is not preferable because the working environment is deteriorated.

(3) Anti-blocking agent The spherical organic inert substance used as the anti-blocking agent in the present invention is an organic substance which does not react with the above-mentioned crystalline polypropylene and other components in the composition. Although not particularly limited, an organic polymer compound substance having a crosslinked structure is preferable. Examples of such a dispersant include a compound having two or more radical polymerizable double bonds in a molecule and an acrylate and / or methacrylate having one radical polymerizable double bond in a molecule. By controlling the concentration and the like, emulsion polymerization can be carried out to obtain an appropriate particle size. A preferred composition is a polymer particle in which the content of the acrylate and / or methacrylate in the polymer particles is 50 to 95% by weight.

Here, the compound having two or more radically polymerizable double bonds in the molecule includes divinylbenzene or a nucleus-substituted derivative thereof, an acrylate of a C1-C12-C2-C3 alcohol, Alternatively, methacrylic acid esters, specifically, ethylene glycol di (meth) acrylate and trimethylolpropane tri (meth) acrylate can be exemplified. Further, in producing the organic polymer compound particles, it is possible to use another compound having a radical polymerizable double bond in addition to the above compound, such as styrene or a derivative thereof, α −
Methylstyrene or a derivative thereof, acrylonitrile,
Methacrylonitrile and the like are exemplified.

The proportion of the acrylate and / or methacrylate in the polymer is preferably from 50 to 95% by weight of the acrylate and / or methacrylate in the polymer. %, The transparency and scratch resistance of the resin using this master batch become poor. The compound having two or more radical polymerizable double bonds in the molecule is preferably 5 to 50% by weight of the polymer, and if less than 5% by weight, the heat resistance is insufficient when used as a master batch. If it is more than 50% by weight, the particle hardness increases and the scratch resistance becomes poor, which is not preferable.

The preferred average particle diameter of the spherical organic inert substance is 0.1 to 10.0 μm, more preferably 0.5 to 5 μm. When the average particle size is less than 0.1 μm, the anti-blocking property is insufficient and 10.0 μm
If it exceeds m, the sliding property and the antiblocking property are not particularly improved, and the transparency is lost, which is not preferable. As for the shape, it is preferable that the shape is as close as possible to a true sphere and the surface has no irregularities, but as a guide, the ratio of the longest diameter to the shortest diameter of the spherical particles is 5 or less, preferably 2 or less, and Is (BET specific surface area) / (calculated specific surface area calculated from average particle diameter and true density) is 50 or less;
Preferably it is 30 or less. If the shape is irregular, when used as a master batch, a large amount of fish eyes are generated in the film due to aggregation of particles.

Specifically, the spherical organic inert substance in the present invention includes Eposta MA1002 (manufactured by Nippon Shokubai Co., Ltd.) whose main component is cross-linked polymethyl methacrylate;
Eposta MA1004 (manufactured by Nippon Shokubai Co., Ltd.), MX-
150 (manufactured by Soken Chemical Co., Ltd.) and MX-180 (manufactured by Soken Chemical Co., Ltd.).

The amount of the spherical organic inert particles to be added is from 8.0 to 12: 1 based on 100 parts by weight of the crystalline polypropylene.
0 parts by weight, preferably 8.5 to 11.5 parts by weight. If the addition amount exceeds 12.0 parts by weight, the extrusion amount during granulation will decrease, or the resin film using this masterbatch will be more likely to cause fish eyes, and will cause burns in the extruder, causing the film to burn. The appearance is unfavorably affected. Also. If the addition amount is less than 8.0 parts by weight, the amount of the master batch used increases, and the amount of work is undesirably increased.

(4) Diamine / monocarboxylic acid polycondensate or diamine / monocarboxylic acid / polybasic acid polycondensate Diamine / monocarboxylic acid polycondensate or diamine / monocarboxylic acid / polybasic acid polycondensation in the present invention The product improves the moldability of the resin to be added, and those generally available on the market can be used as they are, but the moldability as described in JP-A-3-153793 is improved. It can also be produced by a method for producing a processing aid (wax) having a high softening point. As the monocarboxylic acid, a saturated aliphatic monocarboxylic acid having 16 or more carbon atoms or a hydroxycarboxylic acid is preferable. Preferably, stearic acid, which is conventionally used for producing a processing aid (wax) can be used. The polybasic acid is a carboxylic acid of dibasic acid or more, preferably sebacic acid. Diamine /
The melting point of the monocarboxylic acid polycondensate or the diamine / monocarboxylic acid / polybasic acid polycondensate can be adjusted depending on the type of the monocarboxylic acid to be used. It can also be adjusted by changing the amount used. Particularly preferably, ethylenediamine as a diamine, stearic acid as a monocarboxylic acid, and sebacic acid as a polybasic acid are used.

The proportion of the diamine / monocarboxylic acid polycondensate or diamine / monocarboxylic acid / polybasic acid polycondensate used is 8.0 to 16.0 parts by weight based on 100 parts by weight of the crystalline polypropylene. If the amount is less than this, there is no sufficient effect of improving the moldability when added to the syndiotactic polypropylene as a master, and if it is too large, the effect is not particularly improved. Particularly preferred is 9.0-1.
5.0 parts by weight.

(5) Method for Preparing Masterbatch In the present invention, as a method for obtaining the above composition, the composition can be obtained by uniformly dispersing the composition by any known method. For example,
Extrusion melt blending, Banbury blending, and the like.

The composition of the present invention contains a fatty acid metal salt, a neutralizing agent, a slip agent, an anti-blocking agent, and a generally used phosphorus-based or phenol-based antioxidant or a dispersant for inert particles. Additives such as an antistatic agent and a nucleating agent can be appropriately added as needed.

2. Extruded polypropylene film The extruded polypropylene film of the present invention is obtained by adding 5.0 to 2.5 parts by weight of the above-mentioned polypropylene resin composition for a masterbatch to 95.0 to 97.5 parts by weight of syndiotactic polypropylene, for a total of 100 parts by weight. Is an unstretched film formed by a known method such as a T-die method or an inflation method. As the addition amount of the polypropylene resin composition for master batch,
4.5 to 3.0% by weight in the above mixture is more preferable,
Particularly, in a field in which transparency is important, the addition amount of the masterbatch is preferably small, and in a field in which slipperiness and molding workability are particularly important, the addition amount of the masterbatch is preferably set large.
If the addition amount is less than this, the effect of improving the slipperiness, anti-blocking property and moldability is insufficient, and if it is more than this, the moldability is not particularly improved, and the transparency and embossing deteriorate. . Although the thickness of the film is not particularly limited, it is generally 1 to 500 μm, and a film having a preferable thickness is selected as necessary.

The extruded polypropylene film of the present invention comprises
Other films, such as polypropylene biaxially stretched film, unstretched nylon film, stretched nylon film, stretched polyethyl terephthalate film, aluminum foil, formed by a known method such as dry lamination with paper or the like, or extrusion lamination It can be used as a composite film, or a co-extruded composite film by a T-die method or an inflation method, and the thickness of the extruded film layer is not particularly limited, but is preferably 5 to 200 μm,
More preferably, it is 15 to 100 μm.

What is important in the present invention is that a high-concentration masterbatch with good workability and good dispersion of the antiblocking agent is produced by blending a specific amount of a slip agent and a specific shape of an antiblocking agent with the crystalline polypropylene. By adding a specific amount of the masterbatch to syndiotactic polypropylene, an extruded film excellent in moldability, transparency, flexibility, fish eye, etc. can be produced.

The extruded film and sheet of the present invention can be subjected to corona discharge treatment by a method usually employed in industry,
Alternatively, a surface treatment such as a flame treatment can be performed.

[0033]

[Reference Example 1]

Preparation of Crystalline Polypropylene [Preparation of Catalyst] A vibrating mill equipped with four pulverizing pots having a capacity of 4 liters and containing 9 kg of steel balls having a diameter of 12 mm is prepared. 300 g of magnesium chloride, 115 ml of diisobutyl phthalate, and 60 ml of titanium tetrachloride were added to each pot in a nitrogen atmosphere, and pulverized for 40 hours. Co-crushed material 5
g was placed in a 200 ml flask, 100 ml of toluene was added, and the mixture was stirred at 114 ° C. for 30 minutes, and then allowed to stand to remove the supernatant. Then, the solid content was washed three times at 20 ° C. with 100 ml of n-heptane, and 100 ml of n-heptane was further washed.
It was dispersed in heptane to obtain a transition metal catalyst slurry. The obtained transition metal catalyst component contained 1.8% by weight of titanium and 18% by weight of diisobutyl phthalate.

[Production of propylene / ethylene copolymer]
25 kg of propylene was charged into a jacketed autoclave having an inner volume of 100 liters sufficiently dried, purged with nitrogen, and further substituted with propylene to prepare for polymerization.
On the other hand, n-heptane 500 m
l, 1.5 ml of triethylaluminum, 2.2 ml of cyclohexylmethyldimethoxysilane, and 0.30 g of the transition metal catalyst component obtained as a result of the above-mentioned catalyst preparation as a solid content were mixed, and the mixture was pressed into the prepared 100-liter autoclave. did. Next, after charging hydrogen and ethylene in a predetermined amount, the jacket is passed through warm water at an internal temperature of 70 ° C., and the respective gaseous phase concentrations are 3.0 mol% of hydrogen and 3.0 of ethylene.
Propylene was continuously charged at 5 kg / h while hydrogen and ethylene were charged so as to maintain the mol%, and after 3 hours, 6.0 ml of diethylene glycol monoisopropyl ether was injected after 3 hours, and further at 60 ° C. for 30 minutes. The polymerization was completed by stirring.

[Post-treatment] The obtained copolymer slurry is
The inner diameter of the slender part is 15 cm, the inner diameter of the upper thick part is 30 cm, the length of the slender part is 5 m, and the length of the upper thick part is 50 m / h. Introduces a propylene washing liquid at a rate of 100 kg / h, and applies a washing liquid of 110 kg / h from above the countercurrent washing tower and a copolymer slurry washed from below 40 kg / h.
Remove with h. The copolymer slurry thus taken out was discharged into a cyclone maintained at atmospheric pressure through a double pipe which can be heated through a steam of 1 kg / cm ² gauge in an outer pipe having an inner diameter of 20 cm and a length of 60 m, and then heated. Furthermore, it dried at 50 degreeC and 60 mmHg for 10 hours, and 13.3
kg of crystalline polypropylene (propylene-ethylene copolymer) was obtained. The crystalline polypropylene thus obtained had an ethylene content of 4.2% by weight, 230% by weight.
Melt flow index (hereinafter referred to as MFI)
It is written. ) Was 6.5 g / 10 min. [Reference Example 2] Preparation of syndiotactic polypropylene After replacing the autoclave with an internal volume of 200 liters with propylene, isopropylpentadienyl-1-fluorene synthesized according to a conventional method was lithiated, reacted with zirconium tetrachloride, and recrystallized. Then, 0.2 g of isopropyl (cyclopentadienyl-1-fluorenyl) zirconium dicuronide and 30 g of methylaluminoxane (degree of polymerization 16.1) manufactured by Tosoh Akzo Co., Ltd. were charged, and then liquid propylene was added. Insert 40kg, then 6
The temperature was raised to 0 ° C., polymerization was carried out at that temperature for 1 hour, then 1 kg of methanol was charged to demineralize, then unreacted propylene was purged and filtered to obtain 20.0 kg of syndiotactic polypropylene. This polypropylene is ¹³ C-
According to NMR, the syndiotactic pentad fraction is 0.793, and the melt flow index (hereinafter, referred to as “melt flow index”).
Write MI. ) Was 4.5 g / 10 min, and the ratio of the weight average molecular weight to the number average molecular weight (Mw / Mn) measured with 1,2,4 trichlorobenzene was 2.4.

Example 1 1.7 parts by weight of erucamide as a slip agent and 2.0 μm spherical crosslinked poly (methyl methacrylate) particles as an antiblocking agent were added to 100 parts by weight of the propylene-ethylene copolymer obtained in Reference Example 1 10.0 parts by weight of Nippon Shokubai Co., Ltd., Eposta MA1002) and ethylene bisstearic acid amide (Light Aid WE, manufactured by Kyoeisha Chemical Co., Ltd.) as diamine / monocarboxylic acid polycondensate
F, melting point: 146 ° C.) was mixed with 20 liters of Henschel for 2 minutes at an extrusion temperature of 250 ° C. and an extrusion temperature of 65 mm.
The MI of the pellet (hereinafter abbreviated as MB-1) obtained by granulation with a φ extruder was 8.1 g / 10 minutes. This pellet was melt-extruded at a resin temperature of 250 ° C. using a 20 mmφT die to obtain a 60 μm thick unstretched film. Table 1 shows the evaluation results.

Example 2 1.8 μm spherical crosslinked polymethyl methacrylate particles (MX-18 manufactured by Soken Chemical Co., Ltd.) were used as an antiblocking agent.
0), except that the pellets were abbreviated as MB-2. Table 1 shows the evaluation results.

Comparative Example 1 The procedure of Example 1 was repeated, except that the anti-blocking agent was irregular silica of 3.0 μm (Silicia 730, manufactured by Fuji Silysia Chemical Ltd.). Table 1 shows the evaluation results. In this case, because the strands during granulation have irregularities,
The pellet shape became non-uniform, and pinholes and fish eyes due to poor dispersion of the antiblocking agent were found in the formed film.

Example 3 The procedure of Example 1 was repeated except that the amount of erucamide was changed to 2.4 parts by weight.
Abbreviated as -3. ). Table 1 shows the evaluation results. Comparative Example 2 The procedure of Example 1 was repeated except that the amount of erucamide was 3.5 parts by weight. Table 1 shows the evaluation results. In this case, smoking during the granulation was severe, and there was a problem in the working environment.

Example 4 The procedure of Example 2 was repeated except that the amount of MA-180 was changed to 12.0 parts by weight.
Abbreviated as -4. ). Table 1 shows the evaluation results. Example 5 The same operation as in Example 1 was carried out except that the amount of the light amide WEF was changed to 15.0 parts by weight (the produced pellets are abbreviated as MB-5 hereinafter). Table 1 shows the evaluation results.

Example 6 The procedure of Example 1 was repeated except that the light amide WEF was changed to a polycondensate of ethylenediamine / stearic acid / sebacic acid (Kyoeisha Chemical Co., Ltd., light amide WH-215, melting point: 215 ° C.). (The manufactured pellets are referred to as M
Abbreviated as B-6. ). Table 1 shows the evaluation results.

[0042]

[Table 1] Since the masterbatch is added to another resin to improve its properties, it is not used in the form of a film itself, but in Examples 1 to 6 and Comparative Examples 1 and 2, it was intentionally formed into a film. Then, pinholes and fish eyes in the film were evaluated. As can be seen from Table 1, the master batch of the present invention has no pinholes and fish eyes even when the master batch itself is formed into a film.
In the case where a masterbatch was used, pinholes and fish eyes caused by these masterbatches could not occur, so they were not included in the evaluation items.

Example 7 The syndiotechnic polypropylene obtained in Reference Example 2 was granulated (hereinafter abbreviated as SPP) at an extrusion temperature of 190 ° C. using a 50 mmφ extruder, and 97.0 parts by weight of the pellets were used as a master batch. 3.0 parts by weight of MB-1 obtained in Example 1 was blended and mixed with a 20-liter Henschel for 2 minutes, and the pellets were melt-extruded with a 40 mmφT die at a resin temperature of 250 ° C. A stretched film was obtained. Table 2 shows the evaluation results.

Example 8 The procedure of Example 7 was repeated except that MB-2 obtained in Example 2 was used as a master batch. Table 2 shows the evaluation results.

Example 9 The procedure of Example 7 was repeated except that the SPP was 95.5% by weight and the master batch, MB-3, obtained in Example 3 was 4.5% by weight. Table 2 shows the evaluation results.

Example 10 The procedure of Example 7 was repeated except that the SPP was 95.5% by weight and the master batch, MB-4, obtained in Example 4 was 4.5% by weight. Table 2 shows the evaluation results.

Example 11 The procedure of Example 7 was repeated except that the SPP was 95.5% by weight and the master batch, MB-5, obtained in Example 5 was 4.5% by weight. Table 2 shows the evaluation results.

Example 12 The procedure of Example 7 was repeated except that the SPP was 97.5% by weight and the master batch MB-1 obtained in Example 1 was 2.5% by weight. Table 2 shows the evaluation results.

Comparative Example 3 The procedure of Example 7 was repeated except that the SPP was 99.0 parts by weight and the master batch, MB-1 obtained in Example 1, was 1.0 part by weight. Table 2 shows the evaluation results. In this case, at the time of film formation, the film was stuck to the roll or cutter, and the workability was extremely poor, and the antiblocking property of the film was poor.

Comparative Example 4 The procedure of Example 7 was repeated except that 93.0 parts by weight of SPP was used and 7.0 parts by weight of MB-4 obtained in Example 4 was used as a master batch. Table 2 shows the evaluation results. In this case, the film forming workability and the slipperiness were good, but the transparency deteriorated.

Example 13 The procedure of Example 7 was repeated except that MB-6 obtained in Example 6 was used as a master batch. Table 2 shows the evaluation results.

Comparative Example 5 A commercially available propylene homopolymer (MI =
8.3, Mw / Mn = 6.7, melting point: 159 ° C.) 0.1 part by weight of erucamide as a slipping agent, 100 parts by weight of a slip agent, and a synthetic zeolite as an antiblocking agent (Silton M, manufactured by Mizusawa Chemical Co., Ltd.) ) To 0.04 parts by weight of 20
Mix in liter Henschel for 2 minutes, extrusion temperature 250 ° C
The MI of the pellets obtained by granulation with a 65 mmφ extruder was 9.2 g / 10 min. This pellet is 40mmφ
Melt extrusion was performed at a resin temperature of 250 ° C. using a T-die to obtain an unstretched film having a thickness of 40 μm. In this case, it shows the physical properties of the propylene homopolymer film currently distributed in the market, and the film forming workability is extremely excellent, but the transparency of the film is poor, the Young's modulus is high, and the flexibility of the film is poor. .

[0053]

[Table 2]

[0054]

The masterbatch of the present invention comprising a slip agent, an antiblocking agent, a diamine / monocarboxylic acid polycondensate or a diamine / monocarboxylic acid / polybasic acid polycondensate has excellent workability and dispersibility. By adding it to syndiotactic polypropylene, a film having good moldability, transparency, flexibility, and feel, and having less fish eyes can be provided, which is extremely valuable in industry.

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁶ Identification code FI C08K 7/16 C08K 7/16 // (C08L 23/10 33:10) B29K 23:00 B29L 7:00 (72) Inventor Takayuki Yamada 1-6-6 Takasago, Takaishi-shi, Osaka Mitsui Toatsu Chemical Co., Ltd. (72) Inventor Yoshito Imabayashi 1-6-6 Takasago, Takaishi-shi, Osaka Mitsui Toatsu Chemical Co., Ltd.

Claims (5)

[Claims] 1. 100 parts by weight of crystalline polypropylene, 1.5 to 2.6 parts by weight of a higher fatty acid amide as a slipping agent, 8.0 to 12.0 parts by weight of a spherical organic inert substance as an antiblocking agent, A polypropylene resin composition for a masterbatch, comprising 8.0 to 16.0 parts by weight of a monocarboxylic acid polycondensate or a diamine / monocarboxylic acid / polybasic acid polycondensate. 2. The polypropylene resin composition for a masterbatch according to claim 1, wherein the higher fatty acid amide is erucamide. 3. A diamine / monocarboxylic acid polycondensate,
The polypropylene resin composition for a master batch according to claim 1, which is an ethylenediamine / stearic acid polycondensate. 4. The polypropylene resin composition for a masterbatch according to claim 1, wherein the diamine / monocarboxylic acid / polybasic acid polycondensate is ethylenediamine / stearic acid / sebacic acid polycondensate. 5. Syndiotactic polypropylene 9
The haze value obtained by blending and extruding 5.0 to 97.5 parts by weight and a total of 5.0 to 2.5 parts by weight of the polypropylene resin composition for a masterbatch according to claim 1 is 100 parts by weight. A flexible extruded polypropylene film excellent in transparency of 4.0 or less.