JP3323015B2 - Polypropylene composition and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a polypropylene composition and a method for producing the same. More specifically, the present invention relates to a polypropylene composition comprising a specific polypropylene polymer and an α-olefin elastomer and a method for producing the same.

[0002]

2. Description of the Related Art Polypropylene is widely used because it is inexpensive, has excellent mechanical performance balance, and has good solvent resistance and heat resistance. Thermoplastic elastomers have excellent electrical, mechanical and chemical properties and can be obtained at a low cost, so they are very well used as an improver for polypropylene molding processability and a balance of physical properties. Have been. Recently, there has been known a method of adding these thermoplastic elastomers to a propylene / ethylene block copolymer in order to improve the impact resistance of polypropylene.

However, when these thermoplastic elastomers are used as a physical property modifier for polypropylene, the effect of improving the impact resistance is great, but the heat resistance and rigidity are reduced, so that the amount of addition is limited, and the rigidity of the molded product is reduced. When evaluated as a balance of impact resistance, there is a problem that the balance itself hardly changes. In order to solve this problem, to improve the physical properties of conventional polypropylene, the stereoregularity of the polypropylene homo part was increased to change the molecular weight distribution, or a method of mixing polypropylene having different physical properties or adding various nucleating agents, etc. It is generally known to improve rigidity and impact by adding various rubbers having different properties to improve the balance between rigidity and impact resistance.

[0004]

However, in the conventional method, the rubber is added to improve the impact resistance.
Impact resistance can be improved due to the addition of soft rubber, but rigidity is reduced, and means of increasing rigidity, such as increasing the stereoregularity to change the molecular weight distribution or adding nucleating agents in combination, use polypropylene. Although the crystallinity of the compound increases and the rigidity increases, the impact resistance decreases. Thus, there is a problem that the balance of physical properties is not always satisfactory, and it is easy to improve either the rigidity or the impact resistance, but it is difficult to improve it in a well-balanced manner. It has been desired to develop a compound useful for improving the balance between rigidity and impact resistance.

[0005]

Means for Solving the Problems The present inventors have made intensive studies to solve the above problems and completed the present invention. That is, the present invention provides a mixture of a propylene polymer having a terminal unsaturated bond and an α-olefin elastomer having an unsaturated bond with a silane compound having at least two or more Si-H bonds in the presence of a catalyst in the presence of a catalyst. The resulting polypropylene composition has a boiling para-xylene insoluble content of 10% by weight or less and a melt flow rate in the range of 0.1 to 1000/10 minutes. The present invention also relates to a propylene polymer having a terminal unsaturated bond. Α-olefin elastomer having an union and an unsaturated bond, the number of terminal unsaturated bonds contained in the propylene polymer having a terminal unsaturated bond, the number of unsaturated bonds contained in the α-olefin elastomer having an unsaturated bond At least 2 when used in proportions such that the value divided by the number is in the range of 0.1 to 10.
A method for producing a polypropylene composition, which comprises subjecting a silane compound having at least two Si-H bonds to an addition reaction in the presence of a catalyst.

The propylene polymer having a terminal unsaturated bond used in the present invention may be not only a propylene homopolymer but also a random copolymer or a block copolymer containing 20 mol% or less of ethylene or butene. . Such a propylene polymer having a terminal unsaturated bond can be obtained, for example, by copolymerizing propylene with an α-ω diene having an unsaturated bond at both terminals. Such olefin polymerization can be produced by a bulk polymerization method or a gas phase polymerization method in addition to a solvent method using an inert solvent. Further, a catalyst comprising a transition metal compound and an organometallic compound is generally used as a catalyst used in the production. A titanium halide is preferably used as the transition metal compound, and an organoaluminum compound is preferably used as the organometallic compound.

Specifically, titanium tetrachloride obtained by reducing titanium tetrachloride with metallic aluminum, hydrogen or organic aluminum is modified with an electron donating compound, an organic aluminum compound, and if necessary, an oxygen-containing organic compound. A catalyst system comprising an electron donating compound such as, or a carrier such as magnesium halide or a transition metal compound catalyst obtained by supporting them with an electron donating compound and supporting a titanium halide, and an organoaluminum compound. A catalyst system consisting of an electron donating compound such as an oxygen-containing organic compound, or a reaction product of magnesium chloride and an alcohol is dissolved in a hydrocarbon solvent, and then treated with a precipitant such as titanium tetrachloride to form a hydrocarbon solvent. Insolubilize and treat with an electron-donating compound such as an ester or ether if necessary. A catalyst system comprising a transition metal compound catalyst and an organoaluminum compound obtained by a method of treating with a titanium logenide and an electron-donating compound such as an oxygen-containing organic compound as necessary, or a Grignard reagent or a magnesium alkoxide in a hydrocarbon solvent. , And then precipitated by reacting with a halogenating agent such as silicon tetrachloride to make it insoluble in a hydrocarbon solvent, and if necessary, treating with an electron-donating compound such as an ester or ether. Examples of the catalyst system include a transition metal compound catalyst obtained by the method of treating with an organic compound and an organoaluminum compound, and, if necessary, an electron-donating compound such as an oxygen-containing organic compound.

Here, as the electron donating compound, oxygen-containing compounds such as ether, ester, orthoester and alkoxysilicon compound can be preferably exemplified, and alcohol, aldehyde, water and the like can also be used.

As the organoaluminum compound, trialkylaluminum, dialkylaluminum halide, alkylaluminum sesquihalide, and alkylaluminum dihalide can be used. Examples of the alkyl group include a methyl group, an ethyl group, a propyl group, a butyl group, and a hexyl group. Illustrative examples of the halide include chlorine, bromine and iodine. Further, the third group of the periodic table having an unsaturated hydrocarbon compound such as a cyclopentadienyl derivative as a ligand,
Coordinating an activator comprising an aluminoxane compound which is an oligomer or polymer obtained by reacting a metallocene compound of group 4 or 5 with an organic aluminum and water or water of crystallization, if necessary, or a cyclopentadienyl compound Terminal unsaturated bond in polypropylene polymerized using a catalyst in which a metal cation complex of Group 3, 4 or 5 of the Periodic Table serving as a child is combined with an activator comprising a compound which forms a stable anion. Some of these polypropylenes can be used as they are.

Although the molecular weight of the propylene polymer having a terminal unsaturated bond used in the present invention is not particularly limited, the molecular weight is preferably as high as possible from the viewpoint of the physical properties of the molded product. In terms of moldability, if the molecular weight is too high, moldability deteriorates.
Intrinsic viscosity [η] measured with a tetralin solution of 0.5 to 0.5
About 10 dl / g, particularly preferably 1.0 to 5.0 dl
/ G.

The α-ω diene having an unsaturated bond at both terminals used for synthesizing a propylene polymer having a terminal unsaturated bond has at least a vinyl group at the α-position and an unsaturated bond at the ω-position. Any diene compound may be used, and may be linear or branched, and may contain a heteroatom or atomic group such as oxygen, sulfur, and boron. For example, 1,3-
Butadiene, 1,4-pentadiene, 1,5-hexadiene, 1,
6-heptadiene, 1,7-octadiene, 1,8-nonadiene,
1,9-decadiene, 1,10-undecadiene, 1,11-dodecadiene, 1,13-tetradecadiene, 5-methyl-1,5-hexadiene, 6-methyl-1,6-heptadiene, 7-methyl- 1,7
-Octadiene, 8-methyl-1,8-nonadiene, 9-methyl
-1,9-decadiene, 10-methyl-1,10-undecadiene,
Examples thereof include divinylbenzene.

Although the number of terminal unsaturated bonds contained in these propylene polymers is not particularly limited, it is necessary to use a polymer having an average of 0.1 or more per molecular chain in order to increase reactivity. Preferably, when the number of terminal unsaturated bonds is less than this, the reaction may be difficult to occur.

Although the upper limit of the number of terminal unsaturated bonds contained in the propylene polymer is not particularly limited, if the number of terminal unsaturated bonds per 100 carbon atoms in the molecule is more than 1, depending on reaction conditions and the like. The molecular weight of the resulting composition becomes very large, the polymer becomes insoluble in the solvent, and even when heated, the infusible portion is present, which deteriorates moldability and physical properties, and is also used industrially. Value, the amount of catalyst and at least two or more Si-H
It is necessary to control the reaction by reducing the amount ratio of the silane compound having a bond.

As the α-olefin elastomer having an unsaturated bond used in the present invention, a propylene / ethylene / diene copolymer elastomer or the like is industrially available, and an α-olefin such as propylene or ethylene is combined with an unsaturated bond. Can also be obtained by copolymerizing a diene or the like having the following formula: Unsaturated bonds are contained in the propylene / ethylene elastomer or the copolymer elastomer of propylene or ethylene and an α-olefin having 4 or more carbon atoms produced by using the above-mentioned metallocene compound-based catalyst. Therefore, these α-olefin elastomers can be used as they are.

[0015] The number of unsaturated bonds contained in these α-olefin elastomers is not particularly limited, but as in the case of the propylene polymer, it has an average of 0.1 or more per molecular chain in order to increase the reactivity. It is preferable to use a polymer, and if the number of unsaturated bonds is smaller than this, the reaction may not easily occur.

The upper limit of the number of unsaturated bonds contained in the α-olefin elastomer is not particularly limited. However, if the number of unsaturated bonds per 100 carbon atoms in the molecule is more than 1, depending on the reaction conditions, etc. The molecular weight of the copolymer becomes very large, the polymer becomes insoluble in the solvent, and there is an infusible part even when heated, resulting in poor molding processability and physical properties, resulting in industrial value. Therefore, it is necessary to control the reaction by reducing the amount of the catalyst or the ratio of the silane compound having at least two or more Si—H bonds.

In the present invention, at least two or more Si
The silane compound having an -H bond is, for example, a compound represented by the following general formula (Chemical Formula 1), (Chemical Formula 2), (Chemical Formula 3), or (Chemical Formula 4)

[0018]

Embedded image R _n SiH _4-n (where n is 0 to 2 and R is a hydrocarbon residue having 1 to 12 carbon atoms)

[0019]

Embedded image R ₃ Si— (X) _n —SiR ₃ (wherein R represents hydrogen and a hydrocarbon residue having 1 to 12 carbon atoms, at least two of which are hydrogen. X represents a hydrocarbon residue. Group or —SiR ₂ — group Is shown. )

[0020]

Embedded image R ₃ Si—O — (— SiR ₂ —O—) _n —SiR ₃ (wherein n is an integer of 0 or more, R is hydrogen, a hydrocarbon residue having 1 to 12 carbon atoms, and At least two are hydrogen.)

[0021]

Embedded image (In the formula, n is an integer of 3 or more, R is hydrogen, a hydrocarbon residue having 1 to 12 carbon atoms, and at least two of them are hydrogen.)

More specifically, silane, methylsilane, dimethylsilane, ethylsilane, diethylsilane, phenylsilane, diphenylsilane, propylsilane, dipropylsilane, butylsilane, dibutylsilane, hexylsilane, dihexylsilane, methylethylsilane, methylpropylsilane , Isopropylsilane, diisopropylsilane, methylphenylsilane, ethylphenylsilane,
Cyclohexylmethylsilane, dicyclohexylsilane, allylsilane, butenylsilane, pentenylsilane, dimethoxysilane, dichlorosilane, diethoxysilane, and other monosilane compounds and disilanes, dimethyldisilane, diethyldisilane, methylphenyldisilane, diphenyldisilane, dipropyldisilane, dihexyldisilane , Polysilane compounds such as trisilane, trimethyltrisilane, triphenyltrisilane, tetrasilane, and dimethyltetrasilane, and cyclic polysilane compounds in which these are cyclic, dimethyldisiloxane, diethyldisiloxane, diphenyldisiloxane, dibutyldisiloxane, and dimethoxydisiloxane. Siloxane compounds such as siloxane and diethoxydisiloxane and cyclic polysiloxanes in which these are cyclic Such compounds or mixtures thereof can be exemplified.

In the present invention, in the reaction, a propylene polymer having a terminal unsaturated bond and an α-olefin elastomer having an unsaturated bond are used to determine the number of terminal unsaturated bonds contained in the propylene polymer having a terminal unsaturated bond. It is necessary to use each of them in such a ratio that the value obtained by dividing by the number of unsaturated bonds contained in the α-olefin elastomer having an unsaturated bond is in the range of 0.1 to 10. Outside this range, the reaction between the propylene polymer having a terminal unsaturated bond and the α-olefin elastomer having an unsaturated bond is unlikely to occur, and the effect of improving the rigidity and impact resistance in a well-balanced manner is preferably reduced. Absent.

In the present invention, at least two Si
The use ratio of the silane compound having a -H bond to the propylene polymer having a terminal unsaturated bond varies depending on reaction conditions and a desired degree of reaction, and is usually 100 parts by weight of the propylene polymer having a terminal unsaturated bond. It is 0.01 to 10 parts by weight, preferably 0.1 to 5 parts by weight. If the amount is less than the above, crosslinking is hardly caused, and if the amount is too large, the polypropylene composition may be gelled, and the insoluble matter in the boiling paraxylene increases, so that the molded product becomes nonuniform and the physical properties deteriorate, which is not preferable.

The reaction method for adding a silane compound having at least two or more Si—H bonds to the propylene polymer having a terminal unsaturated bond is not particularly limited, and the terminal unsaturation is carried out in the usual manner in the presence of a catalyst. The propylene polymer having a bond can be dissolved in a solvent or mixed with a catalyst in a powder state, and then melt-kneaded and reacted. The reaction temperature is from room temperature to 150 ° C. when a solvent is used, and 150 ° C. to 300 ° C. when the reaction is performed by melt kneading.

In the present invention, as the catalyst, a compound generally known as a hydrosilylation catalyst is used.
For example, chloroplatinic acid, iodoplatinic acid, bromoplatinic acid, platinum salts such as benzonitrile complexes and alkoxy complexes of platinum chloride, acetonitrile complexes and alkoxy complexes of palladium chloride, palladium salts such as cyclooctadiene complexes,
Rhodium salts such as rhodium chloride cyclooctadiene complex and triphenylphosphine complex; metallocene compounds such as titanocene dichloride, zirconocene dichloride and hafnocene dichloride; and titanates are represented by the following general formula Preferable examples include compounds of metals belonging to Group 4 of the periodic table.

[0027]

Embedded image _{^{R 1 n M (O-R}} 2) 4-n ( wherein R ^1, R ² is a hydrocarbon residue of the same or different carbon atoms 1 to 12, n is an integer of 0 to 4, M is A metal selected from titanium, zirconium and hafnium is shown.) A radical generator such as a peroxide can also be used.

The catalyst is brought into contact with a mixture of a propylene polymer having a terminal unsaturated bond and an α-olefin elastomer having an unsaturated bond by adding at least two or more Si-H
When the silane compound having a bond is dissolved in a solvent and mixed, or when the mixture is heated and melt-mixed, the amount of the catalyst used is 0.1 to 100 with respect to the entire polymer.
000 ppm, preferably 1-10000 ppm.

As the solvent used here, specifically, a hydrocarbon compound having 1 to 20 carbon atoms and a halogenated hydrocarbon compound can be used, and a halogenated hydrocarbon compound and an aromatic hydrocarbon compound are particularly preferably used. Is done. Specific examples include hexane, heptane, cyclohexane, benzene, toluene, xylene, ethylbenzene, dichloromethane, chloroform, dichloroethane, trichloroethane, perchloroethane, chlorobenzene, dichlorobenzene, trichlorobenzene and the like.
It is used after being dissolved so as to have a catalyst concentration of 10,000 ppm.

In the case where the catalyst is brought into contact with the mixture by heating and melting without using a solvent, there is no particular limitation on the method of mixing the above-mentioned components and the method of mixing with the additives. , A V-type blender or the like, and then melt-mixed for 30 seconds to 10 minutes with an extruder or a roll, a Banbury mixer, a kneader or the like.

The polypropylene composition of the present invention thus obtained has a melt flow rate of 0.1 to 1
It is preferably in the range of 000/10 minutes. The molecular weight is preferably about 0.1 to 10 dl / g as intrinsic viscosity [η] measured with a tetralin solution at 135 ° C.

The polypropylene composition of the present invention is characterized in that the boiling para-xylene insoluble content is 10% by weight or less. In the present invention, the boiling para-xylene-insoluble matter is a ratio of an extraction residue extracted with boiling para-xylene for 12 hours,
If the amount exceeds 10% by weight, not only does the appearance of the molded article become poor, but also because the gel is present in the molded article,
As a result, the effect of improving the physical properties is not exhibited, which is not preferable.

In obtaining the polypropylene composition of the present invention, various known stabilizers such as antioxidants, ultraviolet absorbers, lubricants, antistatic agents, and other nucleating agents used for ordinary polypropylene are added. Further, various inorganic and organic fine particles, for example, silica, alumina, kaolin, talc, zeolite, titanium oxide, calcium carbonate, calcium silicate, and stearic acid ester can be used.

[0034]

The present invention will be further described with reference to the following examples.

Example 1 [Synthesis of propylene polymer having terminal unsaturated bond]
Into a stainless steel autoclave having an internal volume of 3000 liters, 140 liters of toluene was added, and methylaluminoxane (manufactured by Tosoh Akzo Co., Ltd., polymerization degree 16.2) 12
0 g and 341 g of 1,5-hexadiene were charged. Further, propylene gas is introduced at 20 ° C. and 3 kg / cm ² −
As G, a solution prepared by dissolving 420 mg of dimethylsilylbis (2,4-dimethylcyclopentadienyl) zirconium dichloride synthesized in a conventional manner in 3 liters of toluene was added, and polymerized at 20 ° C. for 2 hours. After completion of the polymerization, unreacted propylene was purged, the polymer was filtered out, vacuum-dried at 80 ° C. for 8 hours, and weighed to obtain 16.7 kg of a propylene polymer. The composition of the reaction solution before and after the polymerization was analyzed by gas chromatography, and 1,5-
The calculated reaction amount of hexadiene was 251 g.

The resulting infrared absorption spectrum of the propylene polymer has absorbed vinyl groups 906cm ^-1 and 1640 cm ^-1, The absorption of vinylidene group in the 884cm ^-1 was observed, calculated from ¹ H-NMR The amount of the terminal unsaturated bond was 20 mmol per 100 g of the polymer. The mmmm pentad fraction determined from ¹³ C-NMR was 0.98, and the intrinsic viscosity (hereinafter referred to as [η]) measured with a tetralin solution at 135 ° C. was 1.16 dl /.
g, the ratio of the weight average molecular weight to the number average molecular weight (hereinafter referred to as Mw / Mn) measured by gel permeation chromatography using 1,2,4-trichlorobenzene was 4.6.

[Addition reaction of silane compound] The above-mentioned propylene polymer (3 kg) and a propylene / ethylene / diene elastomer (EPDM, manufactured by Nippon Synthetic Rubber Co., Ltd., JSR-
300 g of EP24, iodine value 15), 50 g of tetramethyldisilane and 1 g of triphenylphosphine complex of rhodium chloride were added together with 0.1 part by weight of an antioxidant, and the mixture was heated and mixed at 230 ° C. with an extruder to obtain pellets. The resulting pellet was soluble in boiling para-xylene. The pellets are injected into an injection molding machine (Komatsu Ltd. FKS55T).
Then, a test piece for measuring physical properties was prepared, and the physical properties were measured. The physical properties were measured according to the following methods.

Melt flow rate: ASTM-D1238 Flexural modulus: ASTM-D790 Flexural strength: ASTM-D747 Tensile strength: ASTM-D-638 Tensile elongation: ASTM-D-638 Izod impact strength: ASTM-D256 (notched, 23 ° C, -10 ° C)

As a result, the melt flow rate was 25.2.
g / 10 minutes, flexural modulus is 15800 kg / cm^Two, Song
436kg / cm^Two, Tensile strength is 380kg
/ Cm ^Two, Tensile elongation is 483kg / cm^Two, Izo
G impact strength (23 ° C, -10 ° C) is 9.6, respectively.
It was 4.6 kg · cm / cm.

Comparative Example 1 The physical properties were measured in the same manner as in Example 1 except that the triphenylphosphine complex of tetramethyldisilane and rhodium chloride was not added. The result is a melt flow rate of 3
0.4 g / 10 min, flexural modulus 12700 kg / cm
^2. Bending strength is 396 kg / cm ² , tensile strength is 34
0 kg / cm ^2, tensile elongation 382kg / cm ^2, an Izod impact strength (23 ℃, -10 ℃) are the 4.
1, 2.0 kg · cm / cm.

Example 2 [Synthesis of propylene polymer having terminal unsaturated bond]
Polymerization was carried out in the same manner as in Example 1 except that 227 g of 1,7-octadiene was used instead of 1,5-hexadiene, to obtain 18.6 kg of a propylene polymer.
The composition of the reaction solution before and after polymerization was analyzed by gas chromatography to calculate the reaction amount of 1,7-octadiene.
Met.

The resulting infrared absorption spectrum of the propylene polymer has absorbed vinyl groups 906cm ^-1 and 1640 cm ^-1, The absorption of vinylidene group in the 884cm ^-1 was observed, calculated from ¹ H-NMR The amount of the terminal unsaturated bond was 10 mmol per 100 g of the polymer. The mmmm pentad fraction determined from ¹³ C-NMR was 0.98, [η] was 1.02 dl / g,
/ Mn was 3.6.

[Synthesis of α-olefin elastomer having unsaturated bond] 227 g of 1,7-octadiene, 15.75 kg of ethylene and 23.75 kg of propylene were charged and polymerized at 20 ° C. for 1 hour. After the polymerization was completed, unreacted ethylene and propylene were purged, a large amount of methanol was added to precipitate a polymer, and the polymer was filtered out. The polymer was vacuum-dried at 80 ° C. for 8 hours and weighed.
8 kg of a propylene / ethylene / 1,7-octadiene elastomer were obtained. From the IR absorption spectrum, 52% of ethylene was contained. 906 cm ^-1 and 16
At 40 cm ^-1 , vinyl group absorption was observed, and at 884 cm ^-1 , vinylidene group absorption was observed. ^{In 1} H-NMR, a signal of a terminal vinyl group was observed at around 6 ppm, and the amount was 10 mmol per 100 g of the polymer. [Η] was 1.22 dl / g, and MW / MN was 3.1.

[Addition reaction of silane compound] 3 kg of the above propylene polymer, 300 g of a propylene / ethylene / diene elastomer and methyl hydrogen silicone (TSF48
4, 100 g of Toshiba Silicone Co., Ltd.) and 1 g of triphenylphosphine complex of rhodium chloride were added together with 0.1 part by weight of an antioxidant, and the mixture was heated and mixed at 230 ° C. with an extruder to obtain pellets. The pellets are soluble in boiling para-xylene and have a melt flow rate of 2.6 g / 10 min.
The melting point measured by DSC was 142.6 ° C.

Example 3 [Synthesis of propylene polymer having terminal unsaturated bond]
5.7 g of triisobutylaluminum and dimethylsilyl
N-bis (2,4-cyclopentadienyl) zirconium
Dissolve 20 mg of mudichloride in 200 ml of toluene
The solution into a 70 liter autoclave,
15 kg of ren was charged. Then Tris (pentafluo
(Phenyl) Dissolve 46 mg of boron in 50 ml of toluene
The solution thus obtained was added thereto and polymerized at 60 ° C. for 1 hour. Next,
Purge the reaction propylene to remove the polymer and dry it.
After drying and weighing, 6.5 kg of a polymer was obtained. This
[Η] of the polymer is 0.45 dl / g, and MW / MN is
2.6. Infrared absorption of the obtained propylene polymer
884 cm for the spectrum ^-1Absorption of vinylidene group
Was done.¹In the H-NMR, the signal of the terminal vinyl group was 6
ppm is observed around 100 ppm of the polymer
The ratio was 12 mmol.

[Addition reaction of silane compound] 3 kg of the above propylene polymer, 300 g of the propylene / ethylene / diene elastomer used in Example 2, and methyl hydrogen silicone (TSF484, manufactured by Toshiba Silicone Co., Ltd.)
00g and 1 g of lupazole as a catalyst were added to an antioxidant 0.1
The mixture was added together with parts by weight, and heated and mixed at 210 ° C. with an extruder to obtain pellets. The pellets are soluble in boiling para-xylene and have a melt flow rate of 28.5 g / 10 min, DS
The melting point measured at C was 136.2 ° C.

[0047]

Industrial Applicability The polypropylene composition of the present invention is excellent as a compound useful for improving the balance between rigidity and impact resistance of polypropylene, and is extremely valuable industrially.

Claims (2)

(57) [Claims] An addition reaction of a mixture of a propylene polymer having a terminal unsaturated bond and an α-olefin elastomer having an unsaturated bond with a silane compound having at least two or more Si—H bonds in the presence of a catalyst. The resulting polypropylene composition having a boiling para-xylene insoluble content of 10% by weight or less and a melt flow rate in the range of 0.1 to 1000/10 minutes. 2. A propylene polymer having a terminal unsaturated bond and an α-olefin elastomer having an unsaturated bond,
The value obtained by dividing the number of terminal unsaturated bonds contained in the propylene polymer having terminal unsaturated bonds by the number of unsaturated bonds contained in the α-olefin elastomer having unsaturated bonds is in the range of 0.1 to 10. A method for producing a polypropylene composition, characterized in that a silane compound having at least two or more Si-H bonds is subjected to an addition reaction in the presence of a catalyst by using each of the following proportions.