JPH0873675A - Polypropylene composition - Google Patents

Abstract

PURPOSE: To obtain a polypropylene composition having high melting point and crystallization temperature and effective as a structural material excellent in heat resistance and mechanical strength. CONSTITUTION: This polypropylene composition comprises (A) 3-methylbutene-1 polymer-containing polypropylene component obtained by preliminarily polymerizing 3-methylbutene-1 using a catalytic system consisting essentially of a titanium- containing solid catalyst component and an organoaluminum compound component and then polymerizing propylene and (B) a polypropylene component and contains 25-5000wtppm of 3-methylbutene-1. In the polypropylene composition, a weight ratio of polypropylene in the component A to 3-methylbutene-1 polymer is (1:1) to (20:1) and melt flow index (MFI) of the component A satisfies the formula, 0.3/10min<=MFI<=200g/10min.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polypropylene composition having excellent mechanical properties such as rigidity and tensile strength, transparency and surface characteristics, and capable of increasing the molding speed.

[0002]

2. Description of the Related Art In order to use polypropylene as a structural material for automobiles and home electric appliances, rigidity,
It is required to have excellent heat resistance and various good mechanical properties. For that purpose, it is necessary to produce polypropylene with higher stereoregularity, crystallinity, melting point, etc., and in order to increase the productivity of molding processing, high fluidity, high crystallization temperature, crystallization High speed is required.

Heretofore, as a catalyst system for producing a highly crystalline polypropylene, a combination of titanium trichloride and a dialkylaluminum chloride and a combination of an electron donor, a titanium compound and an electron on a magnesium chloride carrier have been used. A combination of a solid catalyst component carrying a donor, an organoaluminum compound such as trialkylaluminum, and an electron donor as a third component is known.

On the other hand, in order to further increase the crystallization temperature and crystallization rate of polypropylene produced using the above titanium trichloride-based and magnesium chloride-supporting titanium-based catalysts,
Usually, an inorganic nucleating agent such as talc is mixed with a metal salt such as aluminum carboxylate (JP-A-3-220208), a sorbitol derivative and an organic nucleating agent such as an organic phosphate to prepare a propylene polymer composition. Methods of manufacturing things are known.

As a method for mixing the nucleating agent with the propylene polymer, a Banbury mixer, a blender or the like is generally used. However, in these methods, variations in the physical properties of the product due to poor dispersion of the nucleating agent and propylene after addition are carried out. This causes problems such as an increase in the density of the polymer composition, contamination of the molding machine, and coloring of the polymer. Therefore, for example,
As a method of improving dispersibility, 3-220208 discloses a method of adding a nucleating agent to a polymerization system in advance when polymerizing propylene. However, although the dispersibility is improved, there are problems of staining and coloring.

In order to solve this problem, in recent years, many proposals have been made regarding high melting point nucleating agent polymers. Furthermore, highly disperse this nucleating agent polymer in polypropylene,
As a method for enhancing the effect of a nucleating agent, for example, JP-A-60-13971.
No. 0, No. 61-151204, No. 62-1738, No. 1-156305, No. 2-169605, No. 2-206605, No. 2-272045, No. 4- In 202505 publication, etc.,
Fine crystalline polymer with a high melting point other than propylene by prepolymerizing olefins, diolefins, etc. that produce crystalline polymers with a high melting point other than propylene using a titanium trichloride-based or titanium chloride-supported titanium-based catalyst, and then subjecting propylene to main polymerization It has been proposed to mix propylene with a propylene polymer.

Further, Japanese Patent Application Laid-Open No. 4-209641 discloses a composition obtained by mixing polypropylene with a 3-methylbutene-1 polymer obtained by a prepolymerization method and a polypropylene having a polymerization ratio of 40 or more. ing.

However, these methods do not always satisfy the above-mentioned required properties of polypropylene, and further improvements are desired.

[0009]

OBJECT OF THE INVENTION The object of the present invention is to improve the molding speed because it has excellent mechanical properties such as rigidity and tensile strength, transparency, surface properties, and high melting point, crystallization temperature and crystallinity. It is to provide a highly crystalline propylene composition that can be obtained.

[0010]

[Technical Means for Solving Problems] In the present invention, (1) after prepolymerizing 3-methylbutene-1 by using a catalyst system containing a titanium-containing solid catalyst component and an organoaluminum compound component as main components, A polypropylene composition containing 25 to 5000 wtppm of a 3-methylbutene-1 polymer consisting of a polypropylene (A) component containing 3-methylbutene-1 polymer obtained by polymerizing propylene and a polypropylene (B) component, (2) The weight ratio of polypropylene to 3-methylbutene-1 polymer in the component (A) is 1: 1 to 20: 1, and
(3) Melt flow index (MFI) of the component (A)
Is in the range of 0.3 g / 10 min ≦ MFI ≦ 200 g / 10 min.

The polypropylene composition of the present invention comprises a 3-methylbutene-1 polymer in polypropylene at 25 to 5000 wtppm.
, And more preferably 50 to 3000 wtppm.

When the content of the 3-methylbutene-1 polymer is less than the above range, the number of polymer particles forming crystal nuclei is small, and the crystallization temperature of the polypropylene composition is not sufficiently improved.

When the content of the 3-methylbutene-1 polymer is more than the above range, the crystallization temperature rises, but there is a problem that the crystallization of the polypropylene composition is hindered and the crystallinity is lowered.

The polymerization catalyst used to obtain the component (A) is a catalyst system containing (a) a titanium-containing solid catalyst component and (b) an organoaluminum compound component as main components.

The titanium-containing solid catalyst component as the component (a) includes a solid catalyst component containing magnesium, titanium, halogen and an electron donor as essential components, or a titanium trichloride solid catalyst component.

The solid catalyst component containing magnesium, titanium, halogen and an electron donor as essential components includes a solid catalyst component in which a titanium compound and an electron donor are supported on a magnesium chloride carrier.

As a method of supporting titanium on a magnesium chloride carrier, for example, (1) magnesium halide,
Titanium compound, a method of co-milling an electron donor, (2) a method of treating the three components sequentially in an inert solvent, or a reaction treatment of two or three components simultaneously, (3) magnesium halide, or magnesium halide and An electron donor and a solution of a polar solvent such as ether or alcohol,
A method of precipitating a solid catalyst component by adding a titanium compound, (4) a method of precipitating a solid catalyst component by adding an inert solvent from a solution prepared by dissolving a magnesium halide, a titanium compound, and an electron donor in a polar solvent. Can be manufactured by.

Various methods for preparing magnesium halide used in the above methods (1) and (2) are known. For example, a method of adding a suitable organic or inorganic halogenating agent to an organomagnesium compound in an ether or an inert hydrocarbon solvent, or adding an inert solvent to a solution of a magnesium halide in a polar solvent such as ether or alcohol. And the like to obtain an activated carrier.

As the electron donor of the magnesium-containing solid catalyst component, a Lewis base of an organic compound having no acidic proton is preferable, and an aromatic dicarboxylic acid ester such as dibutyl phthalate, butyl ethyl phthalate or hexyl butyl phthalate is particularly preferable. , Diheptyl phthalate can be mentioned.

In the present invention, the catalyst solid components described in JP-A-60-152511, JP-A-61-31402 and JP-A-62-81405 are particularly preferable for achieving the effects of the present invention. According to the production methods described above, an aluminum halide is reacted with an organosilicon compound such as silicate, and then a magnesium compound is reacted to precipitate a solid. The obtained white solid is contact-treated with an electron donor and a titanium halide compound.

As the solid catalyst component of the present invention, in addition to the solid catalyst component containing the above magnesium, titanium, halogen and electron donor as essential components, titanium trichloride (Ti
A Cl ₃ ) solid catalyst component can be used.

As the titanium trichloride solid catalyst component, titanium tetrachloride (TiCl ₄ ) is reduced by various methods, for example, β-type titanium trichloride obtained by reducing titanium tetrachloride with an organic aluminum compound. , Further treated with complexing agent, treated with titanium tetrachloride, reduced titanium tetrachloride with metallic aluminum (1/3 for 1 mol of TiCl ₃
eutectic crystals containing mol AlCl ₃ ) or the like, or a ball-milled / electron-donor-treated product thereof.

As the organoaluminum compound component which is the component (b) of the above catalyst system, trialkylaluminum, dialkylhalogenoaluminum, sesquialkylhalogenoaluminum, alkenylaluminum, dialkylhydroaluminum, sesquialkylhydroaluminum, organoaluminumoxy compound is used. And so on.

Specific examples thereof include trialkylaluminums such as trimethylaluminum, triethylaluminum, triisobutylaluminum, trihexylaluminum and trioctylaluminum, dialkyls such as dimethylaluminum chloride, diethylaluminum chloride, diisopropylaluminum chloride and diisobutylaluminum chloride. Halogeno aluminum, sesquimethyl aluminum chloride,
Examples include sesquialkylhalogenoaluminum such as sesquiethylaluminum chloride, ethylaluminum dichloride, diethylaluminum hydride, and sesquiethylaluminum hydride.

The organoaluminum oxy compound is a linear or cyclic polymer represented by the general formula ((-Al (R) O-) _n ) (R is a hydrocarbon group having 1 to 10 carbon atoms, and is partially A halogen atom and / or a group substituted with an RO group are included. N is a degree of polymerization, and is 5 or more, preferably 10 or more), and as specific examples, R 1 is a methyl, ethyl or isobutyl group, respectively. Examples include methylalumoxane, ethylalumoxane, isobutylethylalumoxane, and the like.

When used in combination with a solid catalyst component containing magnesium, titanium, halogen and an electron donor as essential components, trialkylaluminum is preferable among the above organoaluminum compound components. When used in combination with a titanium trichloride solid catalyst component, dialkylhalogenoaluminum is preferable among the above organoaluminum compound components.

If desired, an electron donor component may be further combined as the component (c) with the above catalyst system comprising the components (a) and (b). An organic silicon compound is preferably used as the electron donor component.

Specific examples of the organosilicon compound include t-butylmethyldimethoxysilane, t-butylethyldimethoxysilane, t-butylpropyldimethoxysilane and di-t-.
Butyldimethoxysilane, diisopropyldimethoxysilane and other t-butyl groups and diisopropyl groups and other branched hydrocarbon group-containing methoxysilanes, cyclohexylmethyldimethoxysilane, dicyclopentyldimethoxysilane and other cyclic hydrocarbon group-containing methoxysilanes, etc. Is preferably used.

Using the above-mentioned catalyst system containing titanium-containing solid catalyst component and organoaluminum compound component as main components,
As a method for polymerizing 3-methylbutene-1 in the first step,
Various well-known methods can be adopted, and examples thereof include fluidized bed gas phase polymerization or stirred gas phase polymerization in an inert gas, slurry polymerization in an inert solvent, and bulk polymerization using a monomer as a solvent. .

The polymerization temperature of 3-methylbutene-1 is usually 10 to 150 ° C., preferably 10 to 40 ° C., and the polymerization time is usually 0.1 to 10 hours.

The molar ratio of the aluminum (Al) atom of the organoaluminum compound to the titanium (Ti) atom of the titanium-containing solid catalyst component (Al / Ti atom molar ratio) is usually 0.5 to 1,00.
0, preferably 1-100.

When an electron donor component, particularly an organosilicon compound, is used as the third component of the polymerization catalyst, the molar ratio of the silane (Si) atom of the organosilicon compound and the aluminum (Al) atom of the organoaluminum compound (Si / The Al atom molar ratio) is usually 0.01 to 1, preferably 0.1 to 0.5.

Polymerization is usually carried out until 0.1 to 100 g, preferably 0.1 to 10 g, of 3-methylbutene-1 polymer can be produced per 1 g of the titanium-containing solid catalyst component. The production amount of the polymer can be adjusted by appropriately selecting and controlling the polymerization time and temperature. Hydrogen, diethylzinc, etc. may be used as a molecular weight modifier in the polymerization system.

In the present invention, the 3-
Following the prepolymerization of methylbutene-1, propylene is polymerized in the second stage. As the polymerization method of propylene, similar to 3-methylbutene-1, fluidized bed gas phase polymerization in an inert gas, or stirred gas phase polymerization, slurry polymerization in an inert solvent, bulk using a monomer as a solvent Polymerization etc. are mentioned.

The polymerization of propylene is usually carried out at a polymerization temperature of 15 to
150 ℃, preferably 10 ~ 90 ℃, the polymerization time is usually 0.
1 to 10 hours.

Further, during or after the propylene polymerization, propylene and other olefins, for example, acyclic monoolefins such as ethylene, butene-1,4-methylpentene-1, hexene-1, octene-1, and cyclopentene. Cyclic monoolefins such as cyclohexene and norbornene, non-conjugated diolefins such as dicyclopentadiene, 5-ethylidene-2-norbornene, and 1,5-hexadiene can be copolymerized or block copolymerized.

In the present invention, the melt flow index (MFI) of the component (A) is 0.3 g / 10 minutes ≦ MFI ≦ 200 g / 10
It is in the range of minutes. If the melt flow index is outside the above range, the crystallization of the polypropylene composition is hindered and the crystallinity is lowered, which is not preferable.

In the present invention, in the propylene polymer containing 3-methylbutene-1 polymer as the component (A), the weight ratio of polypropylene to 3-methylbutene-1 polymer is 1: 1.
˜20: 1, preferably 2.3: 1 to 9: 1.

Improvement of crystallization temperature or refinement of spherulite size can be treated as an index of nucleating agent effect. When the weight ratio of the polypropylene to the 3-methylbutene-1 polymer is smaller than the above range, that is, when the proportion of the 3-methylbutene-1 polymer is large, the spherulite size is large and the crystallization temperature is not improved.

When the weight ratio of the polypropylene to the 3-methylbutene-1 polymer is larger than the above range, that is, when the proportion of the 3-methylbutene-1 polymer is small, the spherulite size is large and the crystallization temperature is high. Does not improve.

In the present invention, examples of the polypropylene as the component (B) include homopolymers of propylene and random or block copolymers of propylene with 50% or less of ethylene or α-olefin. The α-olefin used in the copolymer, butene-1, 4-methylpentene-1, hexene-1, acyclic monoolefins such as octene-1, cyclopentene, cyclohexene, cyclic monoolefins such as norbornene, dicyclo Examples include non-conjugated diolefins such as pentadiene, 5-ethylidene-2-norbornene, and 1,5-hexadiene.

As a method for mixing the components (A) and (B), melt mixing or solution mixing can be used.

The melt mixing is not particularly limited, but a well known method of melt mixing an olefin polymer can be adopted. For example, it can be obtained as pellets by melt-kneading using a Brabender, a single-screw extruder, a twin-screw extruder, a mixing roll, a Banbury mixer or the like. The pellets are molded into an arbitrary shape such as a film, a pipe or a tube by injection molding, blow molding, extrusion molding or the like.

Further, at the time of melt mixing, heat, a light stabilizer,
Additives such as antioxidants, antistatic agents, flame retardants and inorganic fillers are usually added.

[0045]

INDUSTRIAL APPLICABILITY The polypropylene composition of the present invention has a high melting point and a high crystallization temperature and therefore can be used as a structural material having excellent heat resistance and mechanical strength. Further, in the present invention, the polypropylene containing 3-methylbutene-1 polymer as the component (A) is externally added (externally added) like the conventional inorganic / organic nucleating agent.
It can also be used as a nucleating agent for addition polymerization. In addition, it can be manufactured with a small reactor, and there is no reactor contamination when the reactor of this plant is used.

[0046]

Example: Melt flow index is ASTM D-1238
10 is the melting amount of the polymer measured at 230 ° C. under a load of 2.16 kg / cm ² for 10 minutes. The crystallization temperature was measured using DSC (DSC-50 manufactured by Shimadzu Corporation). The measurement method is to raise the temperature from room temperature to 230 ° C at a rate of 10 ° C / min.
After holding for 10 minutes, the temperature was lowered from 230 ° C to 50 ° C at a rate of 5 ° C / min, and the crystallization temperature was measured. After that, 50 more
The melting point was measured by raising the temperature from 10 ° C to 230 ° C at a rate of 10 ° C / min.

In the spherulite photograph, a single-action compression molding machine was used, and a film was gradually cooled from 230 ° C. to room temperature at a rate of 1.3 ° C./min.

[0048]

【Example】

Example 1 [Preparation of solid catalyst component] 15 mM of anhydrous aluminum chloride was added to 40 mL of toluene, and then 15 mM of methyltriethoxysilane was added dropwise with stirring. After completion of the addition, reaction was carried out at 25 ° C. for 1 hour. After cooling the reaction product to -5 ° C, 18 mL of diisopropyl ether containing 30 mM butylmagnesium chloride was added dropwise to the reaction product over 30 minutes with stirring to keep the temperature of the reaction solution within the range of -5 to 0 ° C. It was After the dropping was completed, the temperature was gradually raised and the reaction was continued at 30 ° C. for 1 hour. The precipitated solid was filtered off and washed with toluene and n-heptane. Next, suspend 4.9 g of the obtained solid in 30 mL of toluene, add 150 mM of titanium tetrachloride and 3.3 mM of di-n-heptyl phthalate to this suspension, and react at 90 ° C for 1 hour with stirring. It was The solid was filtered off at the same temperature and washed with toluene and then n-heptane.
Furthermore, the solid was suspended again in 30 mL of toluene, 150 mM of titanium tetrachloride was added, and the mixture was reacted at 90 ° C. for 1 hour under stirring. The solid was filtered off at the same temperature, and the solid was washed with toluene and then n-heptane. The titanium content in the obtained catalyst solid component was 3.55% by weight. This solid was suspended in 80 mL of heptane to prepare a heptane slurry of a solid catalyst component.

[First-stage polymerization] In a 500 mL separable flask with a glass filter, 250 m of distilled and dehydrated n-heptane was added.
L, 3-methylbutene-1 40g, triethylaluminum
9.75 mM, t-butylethyldimethoxysilane 1.63 mM,
Subsequently, 2.98 g of the above solid catalyst component was added, and the mixture was stirred at 15 ° C.
Polymerization was carried out for 120 minutes.

[Second Stage Polymerization] After completion of the first stage polymerization, unreacted 3-methylbutene-1 was removed by filtration, and 200 mL of distilled dehydrated n-heptane and 3.25 m of triethylaluminum were again used.
After adding M 4, t-butylethyldimethoxysilane 0.54 mM, propylene gas was fed at a normal pressure at a flow rate of 0.2 NL / min., And the second stage propylene polymerization was carried out at 20 ° C. for 60 minutes. The obtained polypropylene is 3-methylbutene.
-1 polymer (hereinafter abbreviated as "P-3-MB-1") at 16.6 wt%, polypropylene: P-3-MB-1 = 5.02: 1 (weight ratio),
The MFI was 0.5 g / 10 minutes.

[Production of Polypropylene Composition] As the component (A), the above-mentioned P-3-MB-1 containing polypropylene is used,
As the component (B), polypropylene (J109G MFI = 9 manufactured by Ube Industries, Ltd.) was used to obtain a polypropylene composition by the Brabender melt mixing method (temperature 230 ° C., Brabender rotation speed 55 rpm, blending time 5 minutes). It was
The P-3-MB-1 content in the polypropylene composition was 30 ppm, and the crystallization temperature was 124.18 ° C.

Examples 2 to 6 Except that the mixing ratio of the component (A) and the component (B) was changed.
A polypropylene composition was obtained in the same manner as in Example 1.
The P-3-MB-1 content and crystallization temperature of the polypropylene composition are summarized in Table 1.

Examples 7 to 11 The same procedure as in Example 1 was carried out except that the component (A) was produced under the following polymerization conditions. [First stage polymerization] In a 500 mL separable flask equipped with a glass filter, 250 mL of distilled and dehydrated n-heptane, 40 g of 3-methylbutene-1, 9.75 mM of triethylaluminum, 1.63 mM of t-butylethyldimethoxysilane, followed by the above solid 2.91 g of the catalyst component was added, and polymerization was carried out at 15 ° C for 120 minutes.

[Second Stage Polymerization] Following the first stage polymerization,
In the same manner as in Example 1, the second stage propylene polymerization was carried out at 20 ° C. for 10 minutes. The obtained polypropylene is P-3-
Containing 47.9wt% of MB-1, polypropylene: P-3-MB-1 = 1.
09: 1 (weight ratio), MFI was 0.5 g / 10 minutes.

The obtained component (A) and component (B) were mixed in the same manner as in Example 1 to obtain a polypropylene composition. Table 1 shows the P-3-MB-1 content and the crystallization temperature of the polypropylene composition.
Shown in summary.

Example 12 The procedure of Example 1 was repeated except that the component (A) was produced under the following polymerization conditions. [First stage polymerization] In a 500 mL separable flask equipped with a glass filter, 250 mL of distilled and dehydrated n-heptane, 40 g of 3-methylbutene-1, 9.75 mM of triethylaluminum, 1.63 mM of t-butylethyldimethoxysilane, followed by the above solid 2.95 g of the catalyst component was added and polymerization was carried out at 15 ° C for 120 minutes.

[Second Stage Polymerization] Following the first stage polymerization,
A second stage propylene polymerization was carried out in the same manner as in Example 12 except that hydrogen was fed at a flow rate of 0.02 NL / min. For 1 minute. The obtained polypropylene is 17.0 wt% of P-3-MB-1.
%, Polypropylene: P-3-MB-1 = 4.88: 1 (weight ratio), and MFI was 9 g / 10 minutes. The obtained component (A) and component (B) were mixed in the same manner as in Example 1 to obtain a polypropylene composition. The P-3-MB-1 content and crystallization temperature of the polypropylene composition are summarized in Table 2.

Example 13 The procedure of Example 1 was repeated except that the component (A) was produced under the following polymerization conditions. [First stage polymerization] In a 500 mL separable flask equipped with a glass filter, 250 mL of distilled and dehydrated n-heptane, 40 g of 3-methylbutene-1, 9.75 mM of triethylaluminum, 1.63 mM of t-butylethyldimethoxysilane, followed by the above solid 2.97 g of the catalyst component was added, and polymerization was carried out at 15 ° C for 120 minutes.

[Second Stage Polymerization] Following the first stage polymerization,
A second stage propylene polymerization was carried out in the same manner as in Example 12 except that hydrogen was fed at a flow rate of 0.02 NL / min. For 2 minutes. The obtained polypropylene is 17.0 wt% of P-3-MB-1.
%, Polypropylene: P-3-MB-1 = 4.88: 1 (weight ratio), and MFI was 30 g / 10 minutes. The obtained component (A) and component (B) were mixed in the same manner as in Example 1 to obtain a polypropylene composition. The P-3-MB-1 content and crystallization temperature of the polypropylene composition are summarized in Table 2.

Examples 14 to 18 The same procedure as in Example 1 was carried out except that the component (A) was produced under the following polymerization conditions.

[First-stage polymerization] In a 500 mL separable flask with a glass filter, 250 m of distilled and dehydrated n-heptane was added.
L, 3-methylbutene-1 40g, triethylaluminum
9.75 mM, t-butylethyldimethoxysilane 1.63 mM,
Subsequently, 2.91 g of the above solid catalyst component was added, and the mixture was stirred at 15 ° C.
Polymerization was carried out for 120 minutes.

[Second Stage Polymerization] After completion of the first stage polymerization, unreacted 3-methylbutene-1 was removed by filtration, and 200 mL of distilled dehydrated n-heptane and 3.25 m of triethylaluminum were again used.
After adding 0.54 mM of M and t-butylethyldimethoxysilane, propylene gas was fed at a normal pressure of 0.2 NL / min. And hydrogen as a molecular weight regulator at a flow rate of 0.02 NL / min. Second stage propylene polymerization was performed for minutes. The obtained polypropylene contained 17.2 wt% of P-3-MB-1, polypropylene: P-3-MB-1 = 4.82: 1 (weight ratio), and MFI was 200 g / 10 minutes.

The obtained component (A) and component (B) were mixed in the same manner as in Example 1 to obtain a polypropylene composition. Table 3 shows the P-3-MB-1 content and crystallization temperature of the polypropylene composition.
Shown in summary.

Examples 19 to 23 The procedure of Example 1 was repeated except that the polymerization time of the second stage polymerization was 90 minutes in the production of the component (A). The obtained polypropylene is P-3-MB-1
Contains 12.0wt%, polypropylene: P-3-MB-1 = 7.40: 1
(Weight ratio) and MFI were 0.5 g / 10 minutes.

The obtained component (A) and component (B) were mixed in the same manner as in Example 1 to obtain a polypropylene composition. Table 4 shows the P-3-MB-1 content and crystallization temperature of the polypropylene composition.
Shown in summary.

Examples 24 to 28 The procedure of Example 1 was repeated, except that in the production of the component (A), the second stage polymerization was 35 minutes. The obtained polypropylene is P-3-MB-1
Contains 24.9wt%, polypropylene: P-3-MB-1 = 3.02: 1
(Weight ratio) and MFI were 0.5 g / 10 minutes.

The obtained component (A) and component (B) were mixed in the same manner as in Example 1 to obtain a polypropylene composition. Table 4 shows the P-3-MB-1 content and crystallization temperature of the polypropylene composition.
Shown in summary.

Comparative Examples 1-2 Except that the mixing ratio of the component (A) and the component (B) was changed.
A polypropylene composition was obtained in the same manner as in Example 1.
The P-3-MB-1 content and crystallization temperature in the polypropylene composition are summarized in Table 5.

Comparative Examples 3 to 5 P-3-MB-1 powder (P-3-MB-1 content 100 wt% as component (A))
, Melting point 305 ° C.) were mixed in the same manner to obtain a polypropylene composition. P-3- in polypropylene composition
The MB-1 content and crystallization temperature are summarized in Table 6.

Comparative Example 6 Table 6 shows the crystallization temperature of polypropylene obtained by kneading only the component (B) under the same conditions as in Example 1.

[0071]

[Table 1]

[0072]

[Table 2]

[0073]

[Table 3]

[0074]

[Table 4]

[0075]

[Table 5]

[0076]

[Table 6]

[Brief description of drawings]

FIG. 1 shows a polypropylene composition of the present invention,
It is a plot of the relationship between the P-3-MB-1 content of component (A) and the crystallization temperature.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI technical display location C08L 23:22) (72) Inventor Masanori Tamura 8-1 Goi Minamikaigan, Ichihara-shi, Chiba Ube Ko Sanchi Co., Ltd. Chiba Research Institute (72) Inventor Hiromichi Ikeuchi 8-1 Goi Minamikaigan, Ichihara City, Chiba Ube Industries Co., Ltd. Chiba Research Institute

Claims (1)

[Claims] 1. A catalyst system comprising a titanium-containing solid catalyst component and an organoaluminum compound component as main components is used.
Comprised of 3-methylbutene-1 polymer-containing polypropylene (A) component obtained by prepolymerizing 3-methylbutene-1 and then propylene, and polypropylene (B) component
A polypropylene composition containing 25 to 5000 wtppm of 3-methylbutene-1 polymer, wherein (2) the weight ratio of polypropylene to 3-methylbutene-1 polymer in the component (A) is 1: 1.
˜20: 1, and (3) the melt flow index (MFI) of the component (A) is 0.3 g / 10 min ≦ MFI ≦ 200 g / 10
A polypropylene composition characterized in that it is in the range of minutes.