WO2010074001A1

WO2010074001A1 - Propylene-based resin composition, moldings, and container

Info

Publication number: WO2010074001A1
Application number: PCT/JP2009/071159
Authority: WO
Inventors: 秀和三橋; 太郎染野; 良一津乗
Original assignee: 株式会社プライムポリマー
Priority date: 2008-12-22
Filing date: 2009-12-18
Publication date: 2010-07-01
Also published as: KR20110094357A; JPWO2010074001A1; KR101281912B1; JP5511685B2; SG172306A1

Abstract

A propylene-based resin composition capable of providing moldings (such as container) which exhibit excellent physical properties even when the moldings have a reduced wall thickness or a reduced weight. The propylene-based resin composition comprises (A) a propylene-based polymer satisfying the requirements (A1) to (A5), (B) an ethylene/α-olefin copolymer satisfying the requirements (B1) to (B3), and a nucleating agent: (A1) the content of decane insolubles (D_insol) is 90.5 to 97.0wt%, and the content of decane solubles (D_sol) is 3.0 to 9.5wt%; (A2) the η_sol of D_sol is 1.0 to 2.5dl/g; (A3) the ethylene unit content of D_sol by weight is 25 to 35wt%; (A4) the η_insol of D_insol is 0.8 to 1.1dl/g; (A5) the MFR (230°C, 2.16kg) is 35 to 170g/10min; (B1) the copolymer is a polymer obtained by polymerization using a single-site catalyst; (B2) the density is 900 to 919kg/m³; and (B3) the MFR (190°C, 2.16kg) is 0.1 to 50g/10min.

Description

Propylene resin composition, molded body and container

The present invention relates to a propylene-based resin composition, a molded body formed from the composition, and a container formed from the composition.

As a packaging container for food such as jelly, pudding, and coffee (hereinafter, also referred to as a food packaging container), a container having excellent visibility of the contents, that is, transparency, has been conventionally demanded. As a container having excellent transparency, a propylene resin composition having excellent heat resistance, rigidity and transparency is often used as a raw material.

In addition, food is often handled in a low-temperature environment for storage and distribution, so food packaging containers are required not only to have impact resistance at room temperature but also impact resistance at low temperature, that is, low-temperature impact resistance. It is done.

As a propylene resin composition having excellent impact resistance, a composition containing a propylene-ethylene block copolymer, a nucleating agent, and a low density polyethylene resin or a linear low density polyethylene resin is known (for example, patents). Reference 1).

As a propylene resin composition excellent in low-temperature impact resistance, a composition having specific physical properties made of a propylene block copolymer and an ethylene resin is known (see, for example, Patent Documents 2 and 3).

By the way, in recent years, these containers are required to be thinner and lighter from the viewpoint of reducing environmental load, cost, and the like.

Specifically, the thickness of a general food packaging container is about 0.7 to 0.9 mm, but a food packaging container of 0.5 mm or less is required.

However, a propylene-based resin composition that can produce a container having sufficient performance even when a container such as a food packaging container is thinner and lighter than before is still known. There wasn't.

Japanese Patent Laid-Open No. 2001-26686 JP 2002-187996 A Japanese Patent Laid-Open No. 2002-187997

The present invention has been made in view of the above-described problems of the prior art, and even when a molded body including a container such as a food packaging container is manufactured, even if it is thinner and lighter than conventional ones. An object is to provide a propylene-based resin composition excellent in rigidity, low-temperature impact resistance, and transparency, and a molded body such as a container formed from the composition.

As a result of intensive research to achieve the above-mentioned problems, the present inventors have formed a propylene-based resin composition containing a specific propylene-based polymer, a specific ethylene / α-olefin copolymer and a nucleating agent. The present invention has been completed by finding that the molded body such as a container is excellent in rigidity, low-temperature impact resistance and transparency even when it is thinner and lighter than before.

That is, the propylene-based resin composition of the present invention has an ethylene / α satisfying the following requirements (B1) to (B3) and 60 to 80 parts by weight of the propylene-based polymer (A) satisfying the following requirements (A1) to (A5). -Olefin copolymer (B) 20 to 40 parts by weight (provided that the total of propylene polymer (A) and ethylene / α-olefin copolymer (B) is 100 parts by weight), and nucleating agent 0 Including 1 to 0.4 parts by weight.

(A1): The component (D _insol ) insoluble in n-decane of the propylene polymer (A) is 90.5 to 97.0% by weight, and the component (D _sol ) soluble in n-decane is 3 0.0 to 9.5% by weight (provided that the sum of D _insol and D _sol is 100% by weight)
(A2): The intrinsic viscosity [η _sol ] of D _sol measured at 135 ° C. in tetralin is 1.0 to 2.5 dl / g. (A3): a structural unit derived from ethylene in the D _sol The weight is 25 to 35% by weight in 100% by weight of the D _sol. (A4): The intrinsic viscosity [η _insol ] of the D _insol measured at 135 ° C. in tetralin is 0.8 to 1.1 dl / g. Yes (A5): The melt flow rate (MFR) (ASTM D-1238, measuring temperature 230 ° C., load 2.16 kg) of the propylene polymer (A) is 35 to 170 g / 10 min. (B1): ethylene The α-olefin copolymer (B) is an ethylene / α-olefin copolymer polymerized using a single site catalyst as a catalyst. (B2): The density of the ethylene / α-olefin copolymer (B) is 900-919kg / A ³ (B3): melt flow rate (MFR) of the ethylene · alpha-olefin copolymer (B) (ASTM D-1238 , measured temperature 190 ° C., load of 2.16 kg) is 0.1 ~ 50 g / 10 min The propylene polymer (A) preferably satisfies the following requirement (A2 ′), and the ethylene / α-olefin copolymer (B) preferably satisfies the following requirement (B3 ′).

(A2 ′): D _sol has an intrinsic viscosity [η _sol ] measured in tetralin at 135 ° C. of 1.5 to 2.5 dl / g. (B3 ′): ethylene / α-olefin copolymer (B ) Melt flow rate (MFR) (ASTM D-1238, measurement temperature 190 ° C., load 2.16 kg) is 1 to 10 g / 10 min. The propylene-based resin composition of the present invention has a melt flow rate (MFR) ( ASTM D-1238, measuring temperature 230 ° C., load 2.16 kg) is preferably 20 to 100 g / 10 min.

The melt flow rate (MFR) (ASTM D-1238, measurement temperature 190 ° C., load 2.16 kg) of the ethylene / α-olefin copolymer (B) is 2.0 to 5.0 g / 10 min. preferable.

It is preferable that the propylene-based resin composition satisfies the following requirement (X1).

(X1): Using an injection molding machine with a clamping force of 100 tons, cylinder temperature 200 ° C., mold temperature 40 ° C., injection primary pressure 1700 Kg / cm ² , injection speed 30 mm / sec, holding pressure primary pressure 350 kg / Under the conditions of cm ² , pressure holding primary time 4 sec, pressure holding speed 4 mm / sec, a propylene-based resin composition pellet was injection molded to obtain a molded body having a length of 129 mm, a width of 119 mm, and a thickness of 1 mm, Obtained by cutting the molded body into smaller pieces, embedding the obtained cut pieces with resin, encapsulating the resin-embedded cut pieces with RuO ₄ crystals in a glass bottle, dyeing them, and cutting them at room temperature using an ultramicrotome. In the TEM image obtained by observing the obtained ultrathin section using TEM, the depth of the dark color part of the skin layer (layer having a depth of 2 to 5 μm from the surface of the molded body) The propylene-based resin composition of the present invention having a width in the direction of 0.4 μm or less preferably has a tensile modulus of 1300 to 1800 MPa.

The molded body of the present invention is formed from the propylene resin composition.

The container of the present invention is formed from the propylene resin composition.

The food packaging container of the present invention is formed from the propylene resin composition.

The container of the present invention is preferably obtained by injection molding or injection stretch blow molding of the propylene resin composition.

The food packaging container of the present invention is preferably obtained by injection molding or injection stretch blow molding of the propylene resin composition.

The propylene-based resin composition of the present invention has rigidity, low-temperature impact resistance, and transparency even when it is thinner and lighter than conventional ones when manufacturing molded articles including containers such as food packaging containers. Excellent in properties.

2 is a TEM image of a skin layer of a specimen for TEM observation obtained from the test piece for TEM observation of Example 1. FIG. Reference numeral 1 denotes an embedding resin. 2 is a TEM image of a core layer of a specimen for TEM observation obtained from the test piece for TEM observation of Example 1. FIG. 6 is a TEM image of a skin layer of a specimen for TEM observation obtained from the test piece for TEM observation of Example 5. FIG. Reference numeral 1 denotes an embedding resin. 6 is a TEM image of a core layer of a specimen for TEM observation obtained from the test piece for TEM observation in Example 5. FIG. 14 is a TEM image of a skin layer of a specimen for TEM observation obtained from a test piece for TEM observation in Comparative Example 13. FIG. Reference numeral 1 denotes an embedding resin. 18 is a TEM image of a core layer of a specimen for TEM observation obtained from a test piece for TEM observation in Comparative Example 13. FIG.

Next, the present invention will be specifically described.

The propylene-based resin composition of the present invention comprises an ethylene / α-olefin satisfying the following requirements (B1) to (B3) and the propylene-based polymer (A) satisfying the following requirements (A1) to (A5): Copolymer (B) 20 to 40 parts by weight (provided that the total of propylene polymer (A) and ethylene / α-olefin copolymer (B) is 100 parts by weight), and nucleating agent 0.1 Contains 0.4 parts by weight.

(A1): The component (D _insol ) insoluble in n-decane of the propylene polymer (A) is 90.5 to 97.0% by weight, and the component (D _sol ) soluble in n-decane is 3 0.0 to 9.5% by weight (provided that the sum of D _insol and D _sol is 100% by weight)
(A2): The intrinsic viscosity [η _sol ] of D _sol measured at 135 ° C. in tetralin is 1.0 to 2.5 dl / g. (A3): a structural unit derived from ethylene in the D _sol The weight is 25 to 35% by weight in 100% by weight of the D _sol. (A4): The intrinsic viscosity [η _insol ] of the D _insol measured at 135 ° C. in tetralin is 0.8 to 1.1 dl / g. Yes (A5): The melt flow rate (MFR) (ASTM D-1238, measuring temperature 230 ° C., load 2.16 kg) of the propylene polymer (A) is 35 to 170 g / 10 min. (B1): ethylene The α-olefin copolymer (B) is an ethylene / α-olefin copolymer polymerized using a single site catalyst as a catalyst. (B2): The density of the ethylene / α-olefin copolymer (B) is 900-919kg / A ³ (B3): melt flow rate (MFR) of the ethylene · alpha-olefin copolymer (B) (ASTM D-1238 , measured temperature 190 ° C., load of 2.16 kg) is 0.1 ~ 50 g / 10 min [Propylene polymer (A)]
The propylene-based resin composition of the present invention includes a propylene-based polymer (A) that satisfies the above requirements (A1) to (A5). The “propylene polymer (A) satisfying the requirements (A1) to (A5)” is also referred to as “propylene polymer (A)”.

The propylene polymer (A) used in the present invention is not particularly limited as long as it satisfies the requirements (A1) to (A5). Usually, the copolymer obtained by copolymerizing propylene and ethylene is used. A component consisting mainly of propylene-derived structural units (hereinafter also referred to as propylene homopolymer part) and a component consisting mainly of propylene and ethylene-derived structural units (hereinafter referred to as propylene / ethylene copolymer part). And a propylene-based copolymer (so-called block copolymer). Further, a structural unit derived from an α-olefin having 4 to 10 carbon atoms may be contained as a comonomer component in an amount of about 3% by weight or less in 100% by weight of the propylene polymer (A).

(Requirement (A1))
The component (D _insol ) insoluble in n-decane of the propylene polymer (A) is 90.5 to 97.0 wt%, and the component (D _sol ) soluble in n-decane is 3.0 to 9 0.5% by weight, preferably n-decane insoluble component (D _insol ) is 92.0-96.0% by weight, n-decane soluble component (D _sol ) is 4.0- 8.0% by weight (provided that the sum of D _insol and D _sol is 100% by weight).

The propylene polymer (A) used in the present invention is a polymer having a component (D _insol ) insoluble in n-decane and a soluble component (D _sol ) within the above-mentioned range.

In the propylene polymer (A), the component (D _insol ) that is usually insoluble in n-decane is a component mainly composed of a propylene-derived constituent unit (hereinafter also referred to as a propylene homopolymer part), and is crystalline. It is considered that it has high rigidity. The component (D _sol ) soluble in n-decane is a component mainly composed of propylene and ethylene-derived structural units (hereinafter also referred to as a copolymer part). The D _sol component does not exhibit crystallinity, or is a component having low crystallinity, has a low glass transition temperature, and is considered to exhibit impact resistance and compatibility. This is sometimes referred to as a rubber component. The propylene polymer (A) of the present invention is usually a propylene copolymer (so-called block copolymer) having a propylene homopolymer portion and a copolymer portion.

The propylene resin composition of the present invention described later forms a so-called sea-island structure as described later, the D _insol component mainly forms a sea part, and the ethylene / α-olefin copolymer (B) described later mainly forms an island part, The D _sol component is considered to be mainly involved in compatibilization and impact resistance improvement of the D _insol component and the ethylene / α-olefin copolymer (B).

When D _insol is below the above range and D _sol is above the above range, the ratio of D _insol having high rigidity decreases, so that the rigidity of a molded body such as a container obtained from the propylene-based resin composition of the present invention decreases. . In addition, the propylene resin composition of the present invention has a so-called sea-island structure in which D _insol is a continuous phase, but when D _sol exceeds the above range, the transparency tends to decrease. However, it is considered that the reflected light increases. On the other hand, when D _sol is below the above range and D _insol is above the above range, the impact resistance of the molded product obtained from the propylene resin composition of the present invention tends to be lowered. It is considered that the absorbed energy with respect to the impact is reduced by decreasing the ratio of D _sol .

The ratio of D _insol and D _sol of the propylene-based polymer (A) can be obtained by the following method.

200 ml of n-decane is added to 5 g of a sample of the propylene polymer (A), and heated and dissolved at 145 ° C. for 30 minutes to obtain a solution (1). Next, over about 2 hours, the solution is cooled to 25 ° C. and left at 25 ° C. for 30 minutes to obtain a solution (2) containing a precipitate (α). Thereafter, the precipitate (α) is filtered from the solution (2) with a filter cloth having an opening of about 15 μm, and the precipitate (α) is dried, and then the weight of the precipitate (α) is measured. The weight of the precipitate (α) divided by the sample weight (5 g) is taken as the ratio of the n-decane insoluble part (D _insol ). Further, the solution (2) obtained by filtering the precipitate (α) is put in about three times as much acetone as the solution (2), and the components dissolved in n-decane are precipitated, and the precipitate (β ) Thereafter, the precipitate (β) is filtered off with a glass filter (G2, opening of about 100 to 160 μm) and dried, and then the weight of the precipitate (β) is measured. The weight of the precipitate (β) at this time divided by the sample weight (5 g) is taken as the ratio of the n-decane soluble part (D _sol ). In the examples described later, no residue was observed even when the filtrate side from which the precipitate (β) was filtered was concentrated and dried.

In addition, adjustment of the ratio of D _insol and D _{sol in} a propylene-type polymer can be made into arbitrary quantity by adjusting the manufacturing conditions mentioned later.

More specifically, by increasing the polymerization time of [Step 1] in comparison with the polymerization time of [Step 2] in the production method of the propylene polymer (A) described later, the ratio of D _insol is increased. The ratio of _sol can be reduced. Moreover, the ratio of D _insol can be decreased and the ratio of D _sol can be increased by making the polymerization time of [Step 2] longer than the polymerization time of [Step 1].

(Requirement (A2))
The intrinsic viscosity [η _sol ] of D _sol measured in tetralin at 135 ° C. is 1.0 to 2.5 dl / g, preferably 1.5 to 2.5 dl / g, more preferably 1. 6-2.0 dl / g.

When the intrinsic viscosity [η _sol ] is below the above range, the impact resistance of a molded article such as a container obtained from the propylene resin composition of the present invention tends to be lowered. This is _{probably because} the molecular weight of D _sol decreases and the impact absorption energy decreases. Moreover, when intrinsic viscosity [(eta) _sol ] exceeds the said range, there exists a tendency for transparency of molded objects, such as a container obtained from the propylene-type resin composition of this invention, to fall. This is considered to be caused by poor dispersion due to the high molecular weight of D _sol .

In addition, intrinsic viscosity [(eta) _sol ] measured at 135 degreeC in tetralin of said _Dsol of a propylene-type polymer (A) can be determined as follows.

As the sample, the precipitate (β) obtained when the ratios of D _insol and D _sol were obtained was used. About 25 mg of this sample is dissolved in 25 ml of tetralin, and the specific viscosity η _sp is measured in an oil bath at 135 ° C. After dilution by adding 5 ml of tetralin solvent to this tetralin solution, the specific viscosity η _sp is measured in the same manner. This dilution operation was further repeated twice, and the value of η _sp / C when the concentration (C) was extrapolated to 0 was obtained as the intrinsic viscosity, and this value was obtained by measuring the intrinsic viscosity of D _sol at 135 ° C. in tetralin [ η _sol ].

Incidentally, the D _sol, adjusting the intrinsic viscosity measured at 135 ° C. in tetralin [eta _sol] may be any amount by adjusting the manufacturing conditions described later.

More specifically, the amount of hydrogen gas used as a chain transfer agent during the polymerization in [Step 2] in the production process of the propylene polymer (A) can be adjusted. That is, when feeding propylene or propylene and ethylene, the intrinsic viscosity [η _sol ] can be reduced by increasing the feed amount of hydrogen gas relative to the feed amount of propylene and ethylene. Alternatively, when propylene and ethylene are fed, the intrinsic viscosity [η _sol ] can be increased by reducing the feed amount of hydrogen gas relative to the feed amount of propylene and ethylene.

(Requirement (A3))
Weight of structural units derived from ethylene in the D _sol is said a D _sol 100 wt% 25 to 35% by weight, preferably 25.0 to 35.0 wt%, more preferably 28-31 % By weight, more preferably 28.0 to 31.0% by weight.

When the weight of the structural unit derived from ethylene in D _sol is less than the above range, the impact resistance (particularly, low temperature impact resistance) of molded articles such as containers obtained from the propylene-based resin composition of the present invention tends to be inferior. There is. This is presumably because the glass transition temperature is lowered by decreasing the proportion of ethylene in D _sol , the crystallinity is increased, and the energy absorbed for impact is lowered.

On the other hand, when the weight of the structural unit derived from ethylene in D _sol exceeds the above range, the transparency of a molded body such as a container obtained from the propylene-based resin composition of the present invention tends to decrease. It is considered that D _sol becomes difficult to be compatible with D _insol, and the dispersed particle size of the island portion is increased.

The weight of the structural unit derived from ethylene in the D _{sol of} the propylene polymer (A) was determined by measuring and calculating as follows based on the measurement of ¹³ C-NMR.

As the sample, the precipitate (β) obtained when the ratios of D _insol and D _sol were obtained was used. Using this precipitate (β) as a sample, ¹³ C-NMR measurement was performed under the following conditions.

¹³ C-NMR measurement condition measurement device: LA400 type nuclear magnetic resonance apparatus manufactured by JEOL Measurement mode: BCM (Bilevel Complete Decoupling)
Observation frequency: 100.4 MHz
Observation range: 17006.8Hz
Pulse width: C nucleus 45 ° (7.8 μsec)
Pulse repetition time: 5 seconds Sample tube: 5 mmφ
Sample tube rotation speed: 12Hz
Integration count: 20000 times Measurement temperature: 125 ° C
Solvent: 1,2,4-trichlorobenzene: 0.35 ml / heavy benzene: 0.2 ml
Sample amount: about 40mg
From the spectrum obtained by the measurement, the ratio of the monomer chain distribution (triad (triad) distribution) is determined according to the following document (1), and the structural unit derived from ethylene in D _{sol of the} propylene polymer The molar fraction (mol%) (hereinafter referred to as E (mol%)) and the molar fraction (mol%) of structural units derived from propylene (hereinafter referred to as P (mol%)) were calculated. Based on the calculated E (mol%) and P (mol%), the weight (wt%) of the structural unit derived from ethylene in D _{sol of the} propylene polymer is converted to wt% according to the following (formula 1) (hereinafter referred to as E (denoted as (wt%)).

Reference (1): Kakugo, M .; Naito, Y .; Mizunuma, K .; Miyatake, T., Carbon-13 NMR determination of monomer sequence distribution in ethylene-propylene copolymer prepared with delta-titanium trichloride-diethylaluminum chloride. Macromolecules 1982, 15, (4), 1150-1152
E (wt%) = E (mol%) × 28 × 100 / [P (mol%) × 42 + E (mol%) × 28] (Formula 1)
In addition, adjustment of the weight of the structural unit derived from ethylene in _Dsol can be made into arbitrary quantity by adjusting the manufacturing conditions mentioned later.

More specifically, in the production process of the propylene-based polymer (A), in the polymerization of [Step 2], the ethylene feed amount is increased with respect to the propylene feed amount, thereby being derived from ethylene in the D _sol. The weight of the structural unit can be increased. [Step 2] In the polymerization, by reducing the ethylene feed amount relative to the propylene feed amount, the weight of the structural unit derived from ethylene in the D _sol can be reduced.

(Requirement (A4))
The intrinsic viscosity [η _insol ] of D _insol measured at 135 ° C. in tetralin is 0.8 to 1.1 dl / g.

When the intrinsic viscosity [η _insol ] is below the above range, the low molecular weight component in D _insol increases and the energy absorbed against impact decreases, so the container obtained from the propylene resin composition of the present invention When the molded article such as a container has poor impact resistance and the intrinsic viscosity [η _insol ] exceeds the above range, the high molecular weight component in D _insol increases, and the fluidity of the resin when producing a molded article such as a container. However, it is difficult to produce a thin molded article.

In addition, intrinsic viscosity [η _insol ] measured at 135 ° C. in tetralin of the D _insol of the propylene polymer (A) can be determined as follows.

As the sample, the precipitate (α) obtained when the ratios of D _insol and D _sol were obtained was used. About 25 mg of this sample is dissolved in 25 ml of tetralin, and the specific viscosity η _sp is measured in an oil bath at 135 ° C. After dilution by adding 5 ml of tetralin solvent to this tetralin solution, the specific viscosity η _sp is measured in the same manner. This dilution operation was further repeated twice, and the value of η _sp / C when the concentration (C) was extrapolated to 0 was determined as the intrinsic viscosity, and this value was determined as the intrinsic viscosity of D _insol measured at 135 ° C. in tetralin [ η _insol ].

The adjustment of the intrinsic viscosity [η _insol ] of D _insol measured at 135 ° C. in tetralin can be set to an arbitrary amount by adjusting the production conditions described later.

More specifically, the amount of hydrogen gas used as a chain transfer agent during the polymerization in [Step 1] in the production process of the propylene polymer (A) can be adjusted. That is, when feeding propylene or propylene and ethylene, the intrinsic viscosity [η _insol ] can be reduced by increasing the hydrogen gas feed relative to the propylene and ethylene feed. Alternatively, when propylene and ethylene are fed, the intrinsic viscosity [η _insol ] can be increased by reducing the feed amount of hydrogen gas relative to the feed amount of propylene and ethylene.

(Requirement (A5))
The melt flow rate (MFR) (ASTM D-1238, measurement temperature 230 ° C., load 2.16 kg) of the propylene polymer (A) is 35 to 170 g / 10 minutes, preferably 40 to 150 g / 10 minutes. More preferably, it is 50 to 130 g / 10 min.

When the melt flow rate (MFR) of the propylene polymer (A) exceeds the above range, the impact resistance of the molded body such as a container obtained from the propylene resin composition of the present invention is inferior, and the propylene polymer. When the melt flow rate (MFR) of (A) is below the above range, the flowability of the resin when producing a molded body such as a container is inferior using the propylene-based resin composition of the present invention, and the molding is thinned. It becomes difficult to manufacture the body.

In addition, adjustment of the melt flow rate (MFR) of a propylene-type polymer (A) can be made into arbitrary quantity by adjusting the manufacturing conditions mentioned later.

More specifically, in the process for producing the propylene polymer (A), the feed amount of hydrogen gas as a chain transfer agent is adjusted with respect to the feed amount of propylene and / or ethylene in [Step 1] and [Step 2]. It can be adjusted by doing. When feeding propylene or propylene and ethylene, increase the hydrogen feed amount relative to the propylene and ethylene feed amount to increase the melt flow rate (MFR) (ASTM D-1238, measuring temperature 230 ° C, load 2.16 kg) If the feed amount of propylene or the feed amount of propylene and ethylene is reduced, the hydrogen flow rate is reduced relative to the feed amount of propylene and ethylene to reduce the melt flow rate (MFR) (ASTM D-1238, measurement temperature). 230 ° C., load 2.16 kg) can be lowered.

In addition to the above method, a melt flow rate (MFR) (ASTM D-1238, measuring temperature 230 ° C., load 2.) is obtained by melt-kneading a propylene polymer obtained by polymerization in the presence of an organic peroxide. 16 kg) can be adjusted. The melt flow rate (MFR) (ASTM D-1238, measurement temperature 230 ° C., load 2.16 kg) is high by subjecting the propylene polymer obtained by polymerization to melt kneading in the presence of an organic peroxide. The melt flow rate (MFR) (ASTM D-1238, measuring temperature 230 ° C., load 2.16 kg) is increased by increasing the amount of organic peroxide added during the melt-kneading process in the presence of the organic peroxide. Will be higher.

When the propylene polymer obtained by polymerization is subjected to a melt-kneading treatment in the presence of an organic peroxide, 0.005 to 0.05 part by weight of the organic peroxide is added to 100 parts by weight of the propylene polymer. It is desirable to use between.

The organic peroxide that can be used in the melt-kneading process in the presence of the organic peroxide is not particularly limited, but benzoyl peroxide, t-butyl perbenzoate, t-butyl peracetate, t-butyl. Peroxyisopropyl carbonate, 2,5-di-methyl-2,5-di- (benzoylperoxy) hexane, 2,5-di-methyl-2,5-di- (benzoylperoxy) hexyne-3, t -Butyl-diperadipate, t-butylperoxy-3,5,5-trimethylhexanoate, methyl-ethylketone peroxide, cyclohexanone peroxide, di-t-butyl peroxide, dichymyl peroxide, 2 , 5-Di-methyl-2,5-di- (t-butylperoxy) hexane, 2,5, -di-methyl-2,5-di- (t-butylperoxy) Hexin-3,1,3-bis- (t-butylperoxyisopropyl) benzene, t-butylchymyl peroxide, 1,1-bis- (t-butylperoxy) -3,3,5-trimethylcyclohexane 1,1-bis- (t-butylperoxy) cyclohexane, 2,2-bis- (t-butylperoxy) butane, p-menthane hydroperoxide, di-isopropylbenzene hydroperoxide, kiyumen hydroper Oxide, t-butyl hydroperoxide, p-cymene hydroperoxide, 1,1,3,3-tetra-methylbutyl hydroperoxide or 2,5-di-methyl-2,5-di- (hydroperoxy ) Organic peroxides such as hexane can be exemplified. Of these, 2,5-di-methyl-2,5-di- (benzoylperoxy) hexane and 1,3-bis- (t-butylperoxyisopropyl) benzene are more preferred.

The method for producing the propylene-based polymer (A) used in the present invention is not particularly limited, but usually, by copolymerizing propylene and ethylene in the presence of a metallocene compound-containing catalyst or in the presence of a Ziegler-Natta catalyst. can get.

The propylene polymer (A) is preferably obtained by copolymerizing propylene and ethylene in the presence of a Ziegler-Natta catalyst. This is because it is easy to obtain a resin having a wide molecular weight distribution and good moldability.

(Metallocene compound-containing catalyst)
The metallocene compound-containing catalyst includes a metallocene compound, and at least one compound selected from compounds capable of reacting with an organometallic compound, an organoaluminum oxy compound, and a metallocene compound to form an ion pair, and further necessary. Accordingly, there can be mentioned a metallocene catalyst comprising a particulate carrier, preferably a metallocene catalyst capable of performing stereoregular polymerization such as isotactic or syndiotactic structure. Among the metallocene compounds, crosslinkable metallocene compounds exemplified in WO 01/27124 are preferably used.

In the general formula [I], R ¹ , R ² , R ³ , R ⁴ , R ⁵ , R ⁶ , R ⁷ , R ⁸ , R ⁹ , R ¹⁰ , R ¹¹ , R ¹² , R ¹³ , R ¹⁴ are It is selected from hydrogen, a hydrocarbon group, and a silicon-containing group, and each may be the same or different. Such hydrocarbon groups include methyl, ethyl, n-propyl, allyl, n-butyl, n-pentyl, n-hexyl, n-heptyl, n-octyl, n- Linear hydrocarbon groups such as nonyl and n-decanyl; isopropyl, tert-butyl, amyl, 3-methylpentyl, 1,1-diethylpropyl, 1,1-dimethylbutyl, A branched hydrocarbon group such as a methyl-1-propylbutyl group, 1,1-propylbutyl group, 1,1-dimethyl-2-methylpropyl group, 1-methyl-1-isopropyl-2-methylpropyl group; Cyclic saturated hydrocarbon groups such as cyclopentyl group, cyclohexyl group, cycloheptyl group, cyclooctyl group, norbornyl group, adamantyl group; phenyl group, tolyl group, naphthyl group, biphenyl group, A cyclic unsaturated hydrocarbon group such as an enanthryl group or anthracenyl group; a saturated hydrocarbon group substituted with a cyclic unsaturated hydrocarbon group such as a benzyl group, a cumyl group, a 1,1-diphenylethyl group or a triphenylmethyl group; a methoxy group And hetero atom-containing hydrocarbon groups such as ethoxy, phenoxy, furyl, N-methylamino, N, N-dimethylamino, N-phenylamino, pyryl, and thienyl. Examples of the silicon-containing group include a trimethylsilyl group, a triethylsilyl group, a dimethylphenylsilyl group, a diphenylmethylsilyl group, and a triphenylsilyl group. Moreover, the adjacent substituents of R ⁵ to R ¹² may be bonded to each other to form a ring. Examples of such substituted fluorenyl groups include benzofluorenyl group, dibenzofluorenyl group, octahydrodibenzofluorenyl group, octamethyloctahydrodibenzofluorenyl group, octamethyltetrahydrodicyclopentafluorenyl group, etc. Can be mentioned.

In the general formula [I], R ¹ , R ² , R ³ and R ⁴ substituted on the cyclopentadienyl ring are preferably hydrogen or a hydrocarbon group having 1 to 20 carbon atoms. Examples of the hydrocarbon group having 1 to 20 carbon atoms include the aforementioned hydrocarbon groups. More preferably, R ¹ and R ³ are hydrocarbon groups having 1 to 20 carbon atoms (others are hydrogen).

In the general formula [I], R ⁵ to R ¹² substituted on the fluorene ring are preferably hydrocarbon groups having 1 to 20 carbon atoms. Examples of the hydrocarbon group having 1 to 20 carbon atoms include the aforementioned hydrocarbon groups. The adjacent substituents of R ⁵ to R ¹² may be bonded to each other to form a ring.

In the general formula [I], Y that bridges the cyclopentadienyl ring and the fluorenyl ring is preferably a group 14 element of the periodic table, more preferably carbon, silicon, or germanium, and even more preferably a carbon atom. . R ¹³ and R ¹⁴ substituted for Y are preferably hydrocarbon groups having 1 to 20 carbon atoms. These may be the same as or different from each other, and may be bonded to each other to form a ring. Examples of the hydrocarbon group having 1 to 20 carbon atoms include the aforementioned hydrocarbon groups. More preferably, R ¹³ and R ¹⁴ are aryl groups having 6 to 20 carbon atoms. Examples of the aryl group include the above-mentioned cyclic unsaturated hydrocarbon group, a saturated hydrocarbon group substituted with a cyclic unsaturated hydrocarbon group, and a heteroatom-containing cyclic unsaturated hydrocarbon group. R ¹³ and R ¹⁴ may be the same or different, and may be bonded to each other to form a ring. As such a substituent, a fluorenylidene group, a 10-hydroanthracenylidene group, a dibenzocycloheptadienylidene group, and the like are preferable.

In the general formula [I], M is preferably a Group 4 transition metal of the periodic table, more preferably Ti, Zr, or Hf. Q is selected from the same or different combinations from halogen, a hydrocarbon group, an anionic ligand, or a neutral ligand capable of coordinating with a lone pair of electrons. j is an integer of 1 to 4, and when j is 2 or more, Qs may be the same or different from each other. Specific examples of the halogen include fluorine, chlorine, bromine and iodine, and specific examples of the hydrocarbon group include those described above. Specific examples of the anionic ligand include alkoxy groups such as methoxy, tert-butoxy and phenoxy, carboxylate groups such as acetate and benzoate, and sulfonate groups such as mesylate and tosylate. Specific examples of neutral ligands that can be coordinated by lone pairs include organophosphorus compounds such as trimethylphosphine, triethylphosphine, triphenylphosphine, diphenylmethylphosphine, tetrahydrofuran, diethyl ether, dioxane, and 1,2-dimethoxy. And ethers such as ethane. It is preferable that at least one Q is a halogen or an alkyl group.

Such bridged metallocene compounds include diphenylmethylene (3-tert-butyl-5-methyl-cyclopentadienyl) (fluorenyl) zirconium dichloride, diphenylmethylene (3-tert-butyl-5-methyl-cyclopentadienyl). ) (2,7-ditert-butylfluorenyl) zirconium dichloride, diphenylmethylene (3-tert-butyl-5-methyl-cyclopentadienyl) (3,6-ditert-butylfluorenyl) zirconium dichloride , (Methyl) (phenyl) methylene (3-tert-butyl-5-methyl-cyclopentadienyl) (octamethyloctahydrobenzofluorenyl) zirconium dichloride, [3- (1 ', 1', 4 ', 4 ', 7', 7 ', 10', 10'-octamethyloctahydrodibenzo [b, h] fluorenyl) (1,1,3-trimethyl-5-tert-butyl-1,2,3,3a- Tetrahydropentalene)] zirconium di (Compound represented by the following formula [II]) Roraido, are preferably mentioned compounds represented by the following formula [III].

In addition, in the metallocene catalyst used for the production of the propylene-based polymer (A), an organometallic compound, an organoaluminum oxy compound, and a transition metal compound used together with the Group 4 transition metal compound represented by the general formula [I] The compounds disclosed in the above-mentioned publication (WO01 / 27124 pamphlet) and JP-A-11-315109 are limited with respect to the compounds that react with aldehydes to form ion pairs, and the particulate carriers used as necessary. It can be used without.

(Ziegler Natta catalyst)
The propylene polymer (A) used in the present invention can be produced by using a highly stereoregular Ziegler-Natta catalyst. Various known catalysts can be used as the highly stereoregular Ziegler-Natta catalyst. For example, (a) a solid titanium catalyst component containing magnesium, titanium, halogen and an electron donor, (b) an organometallic compound catalyst component, (c) a cyclopentyl group, a cyclopentenyl group, a cyclopentadienyl group and A catalyst comprising an organosilicon compound catalyst component having at least one group selected from the group consisting of these derivatives can be used.

The solid titanium catalyst component (a) can be prepared by contacting a magnesium compound (a-1), a titanium compound (a-2) and an electron donor (a-3). Examples of the magnesium compound (a-1) include a magnesium compound having a reducing ability such as a magnesium compound having a magnesium-carbon bond or a magnesium-hydrogen bond, and a magnesium halide, an alkoxymagnesium halide, an allyloxymagnesium halide, an alkoxymagnesium, Examples include magnesium compounds having no reducing ability, such as allyloxymagnesium and magnesium carboxylates.

In preparing the solid titanium catalyst component (a), it is preferable to use, for example, a tetravalent titanium compound represented by the following formula (1) as the titanium compound (a-2).

Ti (OR) _g X _4-g (1)
(In the formula (1), R is a hydrocarbon group, X is a halogen atom, and 0 ≦ g ≦ 4.)
Specifically, titanium tetrahalides such as TiCl ₄ , TiBr ₄ , and TiI ₄ ; Ti (OCH ₃ ) Cl ₃ , Ti (OC ₂ H ₅ ) Cl ₃ , Ti (On—C ₄ H ₉ ) Cl ₃ , Ti (OC ₂ H ₅ ) Br ₃ , Ti (O-iso-C ₄ H ₉ ) Br ₃ and other trihalogenated alkoxytitanium; Ti (OCH ₃ ) ₂ Cl ₂ , Ti (OC ₂ H ₅ ) ₂ Cl ₂ , Di (halogenated dialkoxytitanium) such as Ti ( _On -C ₄ H ₉ ) ₂ Cl ₂ , Ti (OC ₂ H ₅ ) ₂ Br ₂ ; Ti (OCH ₃ ) ₃ Cl, Ti (OC ₂ H ₅ ) _{3 Cl, Ti (O-n} -C 4 H 9) 3 Cl, Ti (OC 2 H 5) 3 monohalogenated trialkoxy titanium such as _{_{Br; Ti (OCH 3) 4}} , Ti (OC 2 H 5) 4 , Ti (O-n-C 4 H 9) 4, Ti (O-iso-C 4 H 9) 4, Ti (O-2- ethylhexyl) ₄ tetraalkoxy titanium such as And the like.

Examples of the electron donor (a-3) used in the preparation of the solid titanium catalyst component (a) include alcohols, phenols, ketones, aldehydes, esters of organic acids or inorganic acids, organic acid halides, ethers, acids. Examples include amides, acid anhydrides, ammonia, amines, nitriles, isocyanates, nitrogen-containing cyclic compounds, and oxygen-containing cyclic compounds.

When contacting the magnesium compound (a-1), titanium compound (a-2), and electron donor (a-3) as described above, other reaction reagents such as silicon, phosphorus, and aluminum are allowed to coexist. In addition, a carrier-supporting solid titanium catalyst component (a) can be prepared using a carrier.

The solid titanium catalyst component (a) can be prepared by adopting any method including known methods, but a few examples will be briefly described below.
(1) A hydrocarbon solution of a magnesium compound (a-1) containing an electron donor (liquefaction agent) (a-3) is contacted with an organometallic compound to precipitate a solid, or while depositing A method of contact reaction with a titanium compound (a-2).
(2) A method in which a complex composed of a magnesium compound (a-1) and an electron donor (a-3) is contacted and reacted with an organometallic compound, and then a titanium compound (a-2) is contacted.
(3) A method in which a titanium compound (a-2) and an electron donor (a-3) are contact-reacted with a contact product between an inorganic carrier and an organomagnesium compound (a-1). At this time, the contact product may be previously contacted with the halogen-containing compound and / or the organometallic compound.
(4) A carrier on which a magnesium compound (a-1) is supported from a mixture of a magnesium compound (a-1) solution containing a liquefying agent and optionally a hydrocarbon solvent, an electron donor (a-3) and a carrier And then contacting the titanium compound (a-2).
(5) A method of contacting a carrier with a solution containing a magnesium compound (a-1), a titanium compound (a-2), an electron donor (a-3), and optionally a hydrocarbon solvent.
(6) A method of bringing the liquid organomagnesium compound (a-1) into contact with the halogen-containing titanium compound (a-2). At this time, the electron donor (a-3) is used at least once.
(7) A method in which the liquid organomagnesium compound (a-1) and the halogen-containing compound are brought into contact with each other, and then the titanium compound (a-2) is brought into contact therewith. In this process, the electron donor (a-3) is used at least once.
(8) A method of bringing the alkoxy group-containing magnesium compound (a-1) into contact with the halogen-containing titanium compound (a-2). At this time, the electron donor (a-3) is used at least once.
(9) A method of contacting a complex comprising an alkoxy group-containing magnesium compound (a-1) and an electron donor (a-3) with a titanium compound (a-2).
(10) A method in which a complex comprising an alkoxy group-containing magnesium compound (a-1) and an electron donor (a-3) is contacted with an organometallic compound and then contacted with a titanium compound (a-2).
(11) A method in which a magnesium compound (a-1), an electron donor (a-3), and a titanium compound (a-2) are contacted and reacted in an arbitrary order. Prior to this reaction, each component may be pretreated with a reaction aid such as an electron donor (a-3), an organometallic compound, or a halogen-containing silicon compound.
(12) A solid magnesium compound obtained by reacting a liquid magnesium compound (a-1) having no reducing ability with a liquid titanium compound (a-2) in the presence of an electron donor (a-3). -A method of depositing a titanium composite.
(13) A method of further reacting the titanium compound (a-2) with the reaction product obtained in (12) above.
(14) A method in which the reaction product obtained in (11) or (12) is further reacted with an electron donor (a-3) and a titanium compound (a-2).
(15) A solid material obtained by pulverizing a magnesium compound (a-1), a titanium compound (a-2), and an electron donor (a-3) is subjected to halogen, halogen compound or aromatic carbonization. A method of treatment with any of hydrogen. In this method, only the magnesium compound (a-1), or a complex compound composed of the magnesium compound (a-1) and the electron donor (a-3), or the magnesium compound (a-1) and titanium is used. A step of pulverizing the compound (a-2) may be included. Further, after the pulverization, it may be pretreated with a reaction aid and then treated with halogen or the like. As the reaction aid, an organometallic compound or a halogen-containing silicon compound is used.
(16) A method in which the magnesium compound (a-1) is pulverized and then contacted with the titanium compound (a-2). When the magnesium compound (a-1) is pulverized and / or contacted, the electron donor (a-3) is used together with a reaction aid as necessary.
(17) A method of treating the compound obtained in the above (11) to (16) with a halogen, a halogen compound or an aromatic hydrocarbon.
(18) A method in which a contact reaction product of a metal oxide, organomagnesium (a-1) and a halogen-containing compound is brought into contact with an electron donor (a-3) and preferably a titanium compound (a-2).
(19) Magnesium compounds (a-1) such as magnesium salts of organic acids, alkoxymagnesium and aryloxymagnesium, titanium compounds (a-2), electron donors (a-3), and optionally halogen-containing carbonization Method of contacting with hydrogen.
(20) A method of contacting a hydrocarbon solution containing a magnesium compound (a-1) and alkoxytitanium with an electron donor (a-3) and, if necessary, a titanium compound (a-2). In this case, it is preferable that a halogen-containing compound such as a halogen-containing silicon compound coexists.
(21) A liquid magnesium compound (a-1) having no reducing ability is reacted with an organometallic compound to precipitate a solid magnesium / metal (aluminum) complex, and then an electron donor (a- 3) A method of reacting the titanium compound (a-2).

The organometallic compound catalyst component (b) is preferably one containing a metal selected from Group I to Group III of the periodic table. Specifically, an organoaluminum compound, a Group I metal and aluminum as shown below And a complex alkyl compound, and an organometallic compound of a Group II metal.

Formula R ¹ _m Al (OR ² ) _n H _p X _q (wherein R ¹ and R ² are hydrocarbon groups usually containing 1 to 15 carbon atoms, preferably 1 to 4 carbon atoms, which are identical to each other) But it can be different.
X represents a halogen atom, 0 <m ≦ 3, n is 0 ≦ n <3, p is a number of 0 ≦ p <3, q is a number of 0 ≦ q <3, and m + n + p + q = 3. An organoaluminum compound (b-1).

Formula M ^¹ AlR ¹ ₄ (wherein, M ¹ is a Li, Na or K, R ¹ is as defined above.) Group I metals and aluminum and the alkylated complex represented by (b-2) .

Group II or Group III dialkyl compound of formula R ¹ R ² M ² (wherein R ¹ and R ² are as defined above, M ² is Mg, Zn or Cd) (b -3).

Examples of the organoaluminum compound (b-1) include R ¹ _m Al (OR ² ) _3-m (R ¹ and R ² are the same as described above, and m is preferably a number of 1.5 ≦ m ≦ 3. A compound represented by R ¹ _m AlX _3-m (wherein R ¹ is as defined above, X is a halogen, and m is preferably 0 <m <3), A compound represented by R ¹ _m AlH _3-m (R ¹ is as defined above, m is preferably 2 ≦ m <3), R ¹ _m Al (OR ² ) _n X _q (R ¹ and R ² is the same as described above, X is halogen, 0 <m ≦ 3, 0 ≦ n <3, 0 ≦ q <3, and m + n + q = 3). it can.

Specific examples of the organosilicon compound catalyst component (c) include an organosilicon compound represented by the following formula (2).

SiR ¹ R ² _n (OR ³ ) _3-n (2)
(In the formula (2), n is 0, 1 or 2, R ¹ is a group selected from the group consisting of a cyclopentyl group, a cyclopentenyl group, a cyclopentadienyl group and derivatives thereof, and R ² and R ³ are hydrocarbons. Group.)
In the formula (2), specific examples of R ¹ include a cyclopentyl group, a 2-methylcyclopentyl group, a 3-methylcyclopentyl group, a 2-ethylcyclopentyl group, a 3-propylcyclopentyl group, a 3-isopropylcyclopentyl group, 3 -Butylcyclopentyl group, 3-tert-butylcyclopentyl group, 2,2-dimethylcyclopentyl group, 2,3-dimethylcyclopentyl group, 2,5-dimethylcyclopentyl group, 2,2,5-trimethylcyclopentyl group, 2,3 , 4,5-tetramethylcyclopentyl group, 2,2,5,5-tetramethylcyclopentyl group, 1-cyclopentylpropyl group, 1-methyl-1-cyclopentylethyl group and other cyclopentyl groups or derivatives thereof; 2-cyclopentenyl group, 3-cyclopentenyl Group, 2-methyl-1-cyclopentenyl group, 2-methyl-3-cyclopentenyl group, 3-methyl-3-cyclopentenyl group, 2-ethyl-3-cyclopentenyl group, 2,2-dimethyl-3 -Cyclopentenyl group, 2,5-dimethyl-3-cyclopentenyl group, 2,3,4,5-tetramethyl-3-cyclopentenyl group, 2,2,5,5-tetramethyl-3-cyclopentenyl group A cyclopentenyl group or a derivative thereof such as 1,3-cyclopentadienyl group, 2,4-cyclopentadienyl group, 1,4-cyclopentadienyl group, 2-methyl-1,3-cyclopentadiene Enyl group, 2-methyl-2,4-cyclopentadienyl group, 3-methyl-2,4-cyclopentadienyl group, 2-ethyl-2,4-cyclopentadienyl group, 2,2-dimethyl -2,4-cyclope Tadienyl group, 2,3-dimethyl-2,4-cyclopentadienyl group, 2,5-dimethyl-2,4-cyclopentadienyl group, 2,3,4,5-tetramethyl-2,4- A cyclopentadienyl group such as a cyclopentadienyl group or a derivative thereof; a derivative of a cyclopentyl group, a cyclopentenyl group or a cyclopentadienyl group; an indenyl group, a 2-methylindenyl group, a 2-ethylindenyl group, 2 -Indenyl group, 1-methyl-2-indenyl group, 1,3-dimethyl-2-indenyl group, indanyl group, 2-methylindanyl group, 2-indanyl group, 1,3-dimethyl-2-indanyl group, 4,5,6,7-tetrahydroindenyl group, 4,5,6,7-tetrahydro-2-indenyl group, 4,5,6,7-tetrahydro-1-methyl-2-indenyl group 4,5,6,7-tetrahydro-1,3-dimethyl-2-indenyl group, a fluorenyl group and the like.

In the formula (2), specific examples of the hydrocarbon group represented by R ² and R ³ include hydrocarbon groups such as alkyl groups, cycloalkyl groups, aryl groups, and aralkyl groups. When ^two or more R ² or R ³ are present, R ² or R ³ may be the same or different, and R ² and R ³ may be the same or different. In Formula (2), R ¹ and R ² may be cross-linked with an alkylene group or the like.

Among the organosilicon compounds represented by the formula (2), R ¹ is a cyclopentyl group, R ² is an alkyl group or a cyclopentyl group, and R ³ is an alkyl group, particularly a methyl group or an ethyl group. Is preferred.

Specific examples of the organosilicon compound represented by the formula (2) include cyclopentyltrimethoxysilane, 2-methylcyclopentyltrimethoxysilane, 2,3-dimethylcyclopentyltrimethoxysilane, and 2,5-dimethylcyclopentyltrimethoxy. Trialkoxysilanes such as silane, cyclopentyltriethoxysilane, cyclopentenyltrimethoxysilane, 3-cyclopentenyltrimethoxysilane, 2,4-cyclopentadienyltrimethoxysilane, indenyltrimethoxysilane, fluorenyltrimethoxysilane Dicyclopentyldimethoxysilane, bis (2-methylcyclopentyl) dimethoxysilane, bis (3-tert-butylcyclopentyl) dimethoxysilane, bis (2,3-dimethylcyclopentyl) dimethoxy Silane, bis (2,5-dimethylcyclopentyl) dimethoxysilane, dicyclopentyldiethoxysilane, dicyclopentenyldimethoxysilane, di (3-cyclopentenyl) dimethoxysilane, bis (2,5-dimethyl-3-cyclopentenyl) dimethoxy Silane, di-2,4-cyclopentadienyldimethoxysilane, bis (2,5-dimethyl-2,4-cyclopentadienyl) dimethoxysilane, bis (1-methyl-1-cyclopentylethyl) dimethoxysilane, cyclopentyl Cyclopentenyldimethoxysilane, cyclopentylcyclopentadienyldimethoxysilane, diindenyldimethoxysilane, bis (1,3-dimethyl-2-indenyl) dimethoxysilane, cyclopentadienylindenyldimethoxysilane, difluoreni Dialkoxysilanes such as rudimethoxysilane, cyclopentylfluorenyldimethoxysilane, indenylfluorenyldimethoxysilane; tricyclopentylmethoxysilane, tricyclopentenylmethoxysilane, tricyclopentadienylmethoxysilane, tricyclopentylethoxysilane, di Cyclopentylmethylmethoxysilane, dicyclopentylethylmethoxysilane, dicyclopentylmethylethoxysilane, cyclopentyldimethylmethoxysilane, cyclopentyldiethylmethoxysilane, cyclopentyldimethylethoxysilane, bis (2,5-dimethylcyclopentyl) cyclopentylmethoxysilane, dicyclopentylcyclopentenylmethoxy Silane, dicyclopentylcyclopentadienylmethoxysilane And monoalkoxysilanes such as diindenylcyclopentylmethoxysilane; and ethylenebiscyclopentyldimethoxysilane and the like.

When performing polymerization of propylene using a catalyst comprising the solid titanium catalyst component (a), the organometallic compound catalyst component (b), and the organosilicon compound catalyst component (c) as described above, preliminary polymerization is performed in advance. You can also. In the prepolymerization, the olefin is polymerized in the presence of the solid titanium catalyst component (a), the organometallic compound catalyst component (b), and, if necessary, the organosilicon compound catalyst component (c).

As the prepolymerized olefin, an α-olefin having 2 to 8 carbon atoms can be used. Specifically, linear olefins such as ethylene, propylene, 1-butene and 1-octene; 3-methyl-1-butene, 3-methyl-1-pentene, 3-ethyl-1-pentene, 4- Methyl-1-pentene, 4-methyl-1-hexene, 4,4-dimethyl-1-hexene, 4,4-dimethyl-1-pentene, 4-ethyl-1-hexene, 3-ethyl-1-hexene, etc. An olefin having a branched structure can be used. These may be copolymerized.

The prepolymerization is desirably performed so that about 0.1 to 1000 g, preferably about 0.3 to 500 g of a polymer is formed per 1 g of the solid titanium catalyst component (a). If the amount of prepolymerization is too large, the production efficiency of the (co) polymer in the main polymerization may decrease. In the prepolymerization, the catalyst can be used at a considerably higher concentration than the catalyst concentration in the system in the main polymerization. When propylene is continuously multistage polymerized using the catalyst as described above, propylene and ethylene may be copolymerized in any stage or in all stages as long as the object of the present invention is not impaired. Good.

In the case of continuous multistage polymerization, propylene is homopolymerized in each stage, or polypropylene is produced by copolymerizing propylene and ethylene. In the main polymerization, the solid titanium catalyst component (a) (or the prepolymerization catalyst) is converted to titanium atoms per liter of polymerization volume of about 0.0001 to 50 mmol, preferably about 0.001 to 10 mmol. It is desirable to use in quantity. The organometallic compound catalyst component (b) is desirably used in an amount of about 1 to 2000 mol, preferably about 2 to 500 mol, based on 1 mol of titanium atom in the polymerization system. The organosilicon compound catalyst component (c) is desirably used in an amount of about 0.001 to 50 moles, preferably about 0.01 to 20 moles per mole of metal atoms of the organometallic compound catalyst component (b).

(Production method of propylene polymer (A))
The propylene-based polymer (A) used in the present invention can be obtained by copolymerizing propylene and ethylene in the presence of the aforementioned metallocene compound-containing catalyst or in the presence of a Ziegler-Natta catalyst.

Polymerization may be performed by any of a gas phase polymerization method, a liquid phase polymerization method such as a solution polymerization method and a suspension polymerization method, and each stage may be performed by a separate method. Further, it may be carried out by either a continuous type or a semi-continuous type, and each stage may be divided into a plurality of polymerization vessels, for example, 2 to 10 polymerization vessels. Industrially, it is most preferable to polymerize by a continuous method. In this case, it is preferable to carry out the polymerization in the second and subsequent stages separately into two or more polymerization vessels, thereby suppressing the generation of gel. .

As the polymerization medium, inert hydrocarbons may be used, or liquid propylene may be used as the polymerization medium. The polymerization conditions in each stage are such that the polymerization temperature is in the range of about −50 to + 200 ° C., preferably about 20 to 100 ° C., and the polymerization pressure is atmospheric pressure to 10 MPa (gauge pressure), preferably about 0.2 to 5 MPa. It is appropriately selected within the range of (gauge pressure).

In the case of producing the propylene polymer (A), the following two steps ([Step 1] and [Step 2]) are continuously performed in a reaction apparatus in which two or more polymerization vessels are connected in series. Can be obtained. In the present invention, [Step 1] can be performed in each polymerization apparatus using a polymerization apparatus in which two or more reactors are connected in series, and a polymerization apparatus in which two or more reactors are connected in series is used. [Step 2] can be performed in each polymerization apparatus.

Also, other than the above method, the step [Step 1] and [Step 2] are performed separately, and the resulting products are melt-kneaded using a single screw extruder, multi-screw extruder, kneader, Banbury mixer, etc., and propylene A type | system | group polymer (A) can also be manufactured. Hereinafter, a method for producing a propylene polymer (A) by continuously performing [Step 1] and [Step 2] will be described.

In [Step 1], ethylene is (co) polymerized if necessary with propylene at a polymerization temperature of 0 to 100 ° C. and a polymerization pressure of normal pressure to 5 MPa gauge pressure. In [Step 1], the propylene-based (co) polymer produced in [Step 1] becomes the main component of D _{insol by reducing} the amount of ethylene fed to propylene or by not feeding ethylene. To. If necessary, a chain transfer agent typified by hydrogen gas can also be introduced to adjust the intrinsic viscosity [η] of the polymer produced in [Step 1].

[Step 2] copolymerizes propylene and ethylene at a polymerization temperature of 0 to 100 ° C. and a polymerization pressure of normal pressure to 5 MPa gauge pressure. In [Step 2], the propylene-ethylene copolymer rubber produced in [Step 2] becomes the main component of D _sol by increasing the amount of ethylene fed to propylene than in [Step 1]. To do. If necessary, a chain transfer agent typified by hydrogen gas can also be introduced to adjust the intrinsic viscosity [η] of the polymer produced in [Step 2].

The propylene-based polymer (A) is obtained by continuously performing the above steps [Step 1] and [Step 2]. However, the requirement (A1), that is, the ratio of D _insol to D _sol is as described above. It can be prepared by adjusting the polymerization time in [Step 1] and [Step 2]. That is, by increasing the polymerization time of [Step 1] as compared with the polymerization time of [Step 2], the proportion of D _insol can be increased and the proportion of D _sol can be decreased. Moreover, the ratio of D _insol can be decreased and the ratio of D _sol can be increased by making the polymerization time of [Step 2] longer than the polymerization time of [Step 1].

The requirement (A2) relating to D _sol can be adjusted by the feed amount of hydrogen gas used as a chain transfer agent when performing [Step 2]. That is, when feeding propylene or propylene and ethylene, the intrinsic viscosity [η _sol ] can be reduced by increasing the feed amount of hydrogen gas relative to the feed amount of propylene and ethylene. When feeding the feed amount or propylene and ethylene, the intrinsic viscosity [η _sol ] can be increased by reducing the feed amount of hydrogen gas relative to the feed amount of propylene and ethylene.

The requirement (A3) related to D _sol can be adjusted by adjusting the propylene feed amount and the ethylene feed amount when performing [Step 2]. That is, the weight of the structural unit derived from ethylene in the D _sol can be increased by increasing the ethylene feed amount relative to the propylene feed amount. Moreover, the weight of the structural unit derived from ethylene in the D _sol can be reduced by _reducing the ethylene feed amount relative to the propylene feed amount.

The requirement (A4) relating to D _insol can be adjusted by the feed amount of hydrogen gas used as a chain transfer agent when performing [Step 1]. In other words, when feeding propylene or propylene and ethylene, the intrinsic viscosity [η _insol ] can be reduced by increasing the feed amount of hydrogen gas relative to the feed amount of propylene and ethylene. When feeding the feed amount or propylene and ethylene, the intrinsic viscosity [η _insol ] can be increased by reducing the feed amount of hydrogen gas relative to the feed amount of propylene and ethylene.

Requirement (A5) is that the feed amount of hydrogen gas as a chain transfer agent with respect to the feed amount of propylene when performing [Step 1] or [Step 2] or the feed amount of propylene and ethylene when feeding propylene and ethylene. Adjustment is possible by adjusting the amount. When feeding propylene or propylene and ethylene, the MFR can be increased by increasing the hydrogen feed relative to the propylene and ethylene feed. When propylene or propylene and ethylene are fed The MFR can be lowered by reducing the hydrogen feed amount relative to the propylene and ethylene feed amounts.

In addition to the above method, a melt flow rate (MFR) (ASTM D-1238, measuring temperature 230 ° C., load 2.) is obtained by melt-kneading a propylene polymer obtained by polymerization in the presence of an organic peroxide. 16 kg) can be adjusted. The melt flow rate (MFR) (ASTM D-1238, measurement temperature 230 ° C., load 2.16 kg) is high by subjecting the propylene polymer obtained by polymerization to melt kneading in the presence of an organic peroxide. The melt flow rate (MFR) (ASTM D-1238, measuring temperature 230 ° C., load 2.16 kg) is increased by increasing the amount of organic peroxide added during the melt-kneading process in the presence of the organic peroxide. Will be higher. When the propylene-based polymer obtained by polymerization is melt-kneaded in the presence of an organic peroxide, the organic peroxide is between 0.005 and 0.05 parts by weight per 100 parts by weight of the propylene-based polymer. It is desirable to use it. The melt kneading process in the presence of the organic peroxide may be performed after the following post-treatment process.

After completion of the polymerization, the propylene polymer (A) is obtained as a powder by performing post-treatment steps such as a known catalyst deactivation treatment step, a catalyst residue removal step, and a drying step as necessary.

[Ethylene / α-olefin copolymer (B)]
The propylene-based resin composition of the present invention contains an ethylene / α-olefin copolymer (B) that satisfies the above requirements (B1) to (B3). The “ethylene / α-olefin copolymer (B) satisfying the requirements (B1) to (B3)” is also referred to as “ethylene / α-olefin copolymer (B)”. The ethylene / α-olefin copolymer (B) preferably further satisfies the following requirement (B4).

The ethylene / α-olefin copolymer (B) used in the present invention is not particularly limited as long as it satisfies the requirements (B1) to (B3), and ethylene and an α-olefin having 3 to 20 carbon atoms are used. A copolymer obtained by copolymerization is preferred from the viewpoint of good impact resistance and transparency.

Examples of the α-olefin having 3 to 20 carbon atoms include propylene, 1-butene, 1-pentene, 3-methyl-1-butene, 1-hexene, 4-methyl-1-pentene, 3-methyl-1-pentene, Examples thereof include 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicosene and the like. Of these, α-olefins having 4 to 10 carbon atoms are preferred from the viewpoints of transparency, impact resistance, rigidity and economy.

(Requirement (B1))
The ethylene / α-olefin copolymer (B) used in the present invention is an ethylene / α-olefin copolymer polymerized using a single site catalyst as a catalyst.

Examples of the single site catalyst include (a) a transition metal compound as described later, (b) an organoaluminum oxy compound, (c) a particulate carrier, and (d) a single site formed from an organoaluminum compound as required. The olefin polymerization catalyst can be used.

When the ethylene / α-olefin copolymer (B) used in the present invention is an ethylene / α-olefin copolymer polymerized using a single site catalyst, a highly transparent propylene resin composition can be obtained. There is a tendency to be able to. Conventional, since the so-called Ziegler-Natta (B) component of the catalyst polymerised present invention than the ethylene · alpha-olefin copolymer using is uniform composition distribution, easily compatibilized with D _sol component, also It is presumed that the molecular weight distribution is also narrowed and low molecular weight components that cause deterioration in low temperature impact resistance are reduced.

From the above, by using an ethylene / α-olefin copolymer polymerized using a single site catalyst, it is possible to obtain a propylene-based resin composition having excellent transparency and excellent low-temperature impact resistance. .

Examples of the single-site catalyst include a catalyst containing a constrained geometric complex (a so-called constrained geometric catalyst (also referred to as a CGC (constrained geometry catalyst) catalyst)) or a metallocene compound-containing catalyst. Among these, it is preferable to use a metallocene compound-containing catalyst from the viewpoint of particularly good low-temperature impact resistance.

(Requirement (B2))
The density of the ethylene / α-olefin copolymer (B) used in the present invention is 900 to 919 kg / m ³ .

When the density of the ethylene / α-olefin copolymer (B) is below the above range, the rigidity and transparency of a molded article such as a container obtained from the propylene resin composition of the present invention tend to be inferior. (B) It is estimated that the crystallinity of the component is lowered and the refractive index difference from the propylene polymer (A) is also increased. On the other hand, when the density of the ethylene / α-olefin copolymer (B) exceeds the above range, the transparency of a molded article such as a container obtained from the propylene resin composition of the present invention tends to be lowered. This is also considered to be because the difference in refractive index between the ethylene / α-olefin copolymer (B) and the propylene polymer (A) becomes large. That is, when the density range of the ethylene / α-olefin copolymer (B) is out of the above range, the transparency is deteriorated.

The density of the ethylene / α-olefin copolymer (B) can be adjusted to an arbitrary amount by adjusting the production conditions described later.

More specifically, in the polymerization of the ethylene / α-olefin copolymer (B), which will be described later, by changing the ratio of the feed amount of ethylene and α-olefin when the ethylene / α-olefin copolymer is polymerized. It can be adjusted. Specifically, it is possible to reduce the density by increasing the feed amount of α-olefin relative to the feed amount of ethylene, and reduce the feed amount of α-olefin relative to the feed amount of ethylene. It is possible to increase the density.

The density of the ethylene / α-olefin copolymer (B) is measured when the melt flow rate of the ethylene / α-olefin copolymer (B) is measured (ASTM D-1238, measurement temperature 190 ° C., load 2.16 kg). The strand obtained by heat treatment at 120 ° C. for 1 hour and slowly cooled to room temperature over 1 hour was used as a sample, the density was measured by a density gradient tube method, and an ethylene / α-olefin copolymer (B ) Density.

(Requirement (B3))
The melt flow rate (MFR) (ASTM D-1238, measurement temperature 190 ° C., load 2.16 kg) of the ethylene / α-olefin copolymer (B) used in the present invention is 0.1 to 50 g / 10 min. The amount is preferably 1 to 10 g / 10 minutes, more preferably 2.0 to 5.0 g / 10 minutes.

When the melt flow rate (MFR) (ASTM D-1238, measurement temperature 190 ° C., load 2.16 kg) of the ethylene / α-olefin copolymer is below the above range, the molecular weight increases, so that the molded body such as a container is used. The flowability of the resin during production is inferior, making it difficult to produce a thin molded product, and the melt flow rate (MFR) of the ethylene / α-olefin copolymer (ASTM D-1238, measuring temperature 190 ° C., When the load (2.16 kg) exceeds the above range, the molecular weight is low and the absorbed energy for impact is lowered, so that the impact resistance of a molded article such as a container obtained from the propylene-based resin composition of the invention is inferior.

The melt flow rate (MFR) (ASTM D-1238, measurement temperature 190 ° C., load 2.16 kg) of the ethylene / α-olefin copolymer (B) can be adjusted by adjusting the production conditions described later. The amount can be.

More specifically, in the polymerization of the ethylene / α-olefin copolymer (B), which will be described later, the amount of hydrogen gas is adjusted by adjusting the feed amount of ethylene and / or α-olefin during polymerization. It is possible. When feeding ethylene gas during polymerization or ethylene and α-olefin, the melt flow rate (MFR) (ASTM D-1238) can be increased by increasing the feed amount of hydrogen gas relative to the feed amount of ethylene and α-olefin. The measurement temperature is 190 ° C and the load is 2.16 kg), and the feed amount of hydrogen gas relative to the feed amount of ethylene and α-olefin when ethylene gas and α-olefin are fed. It is possible to lower the melt flow rate (MFR) (ASTM D-1238, measurement temperature 190 ° C., load 2.16 kg) by reducing the amount of the heat flux.

Hereinafter, the single-site olefin polymerization catalyst and each catalyst component used for the production of the ethylene / α-olefin copolymer (B) will be described. The (a) transition metal compound (hereinafter sometimes referred to as “component (a)”) used in the present invention is a transition metal compound represented by the following formula (I).

MLx (I)
In the formula (I), M is a transition metal atom selected from Group IVB of the periodic table, specifically zirconium, titanium or hafnium, preferably zirconium.

X is the valence of the transition metal atom M, and indicates the number of L coordinated to the transition metal atom. L is a ligand coordinated to the transition metal atom M, and at least two of these ligands L are a cyclopentadienyl group, a methylcyclopentadienyl group, and an ethylcyclopentadienyl group. Or a substituted cyclopentadienyl group having at least one substituent selected from hydrocarbon groups having 3 to 10 carbon atoms, and the ligand L other than the (substituted) cyclopentadienyl group is carbon These are a hydrocarbon group, an alkoxy group, an aryloxy group, a halogen atom, a trialkylsilyl group or a hydrogen atom having a number of 1 to 12.

The substituted cyclopentadienyl group may have two or more substituents, and the two or more substituents may be the same or different. When the substituted cyclopentadienyl group has two or more substituents, at least one substituent may be a hydrocarbon group having 3 to 10 carbon atoms, and the other substituents include a methyl group, an ethyl group, and the like. Alternatively, it is a hydrocarbon group having 3 to 10 carbon atoms. The substituted cyclopentadienyl groups coordinated to M may be the same or different.

Specific examples of the hydrocarbon group having 3 to 10 carbon atoms include an alkyl group, a cycloalkyl group, an aryl group, and an aralkyl group. More specifically, n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, t-butyl group, pentyl group, hexyl group, octyl group, 2-ethylhexyl group, decyl group, etc. Examples include alkyl groups; cycloalkyl groups such as cyclopentyl group and cyclohexyl group; aryl groups such as phenyl group and tolyl group; and aralkyl groups such as benzyl group and neophyll group.

Of these, an alkyl group is preferable, and an n-propyl group and an n-butyl group are particularly preferable. In the present invention, the (substituted) cyclopentadienyl group coordinated to the transition metal is preferably a substituted cyclopentadienyl group, more preferably a cyclopentadienyl group substituted with an alkyl group having 3 or more carbon atoms. A substituted cyclopentadienyl group is more preferred, and a 1,3-substituted cyclopentadienyl group is particularly preferred.

In the above formula (I), the ligand L other than the (substituted) cyclopentadienyl group coordinated to the transition metal atom M is a hydrocarbon group having 1 to 12 carbon atoms, an alkoxy group, an aryloxy group, a halogen atom. , A trialkylsilyl group or a hydrogen atom.

Examples of the hydrocarbon group having 1 to 12 carbon atoms include an alkyl group, a cycloalkyl group, an aryl group, and an aralkyl group, and more specifically, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, and the like. Group, n-butyl group, isobutyl group, sec-butyl group, t-butyl group, pentyl group, hexyl group, octyl group, 2-ethylhexyl group, decyl group and other alkyl groups; cyclopentyl group, cyclohexyl group and other cycloalkyl groups Examples thereof include aryl groups such as phenyl group and tolyl group; aralkyl groups such as benzyl group and neophyll group.

Examples of alkoxy groups include methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, isobutoxy, sec-butoxy, t-butoxy, pentoxy, hexoxy, octoxy, etc. be able to.

Examples of the aryloxy group include a phenoxy group. Examples of the halogen atom include fluorine, chlorine, bromine and iodine.

Examples of the trialkylsilyl group include a trimethylsilyl group, a triethylsilyl group, and a triphenylsilyl group. Examples of the transition metal compound represented by the general formula (I) include bis (cyclopentadienyl) zirconium dichloride, bis (methylcyclopentadienyl) zirconium dichloride, bis (ethylcyclopentadienyl) zirconium dichloride, bis (N-propylcyclopentadienyl) zirconium dichloride, bis (n-butylcyclopentadienyl) zirconium dichloride, bis (n-hexylcyclopentadienyl) zirconium dichloride, bis (methyl-n-propylcyclopentadienyl) Zirconium dichloride, bis (methyl-n-butylcyclopentadienyl) zirconium dichloride, bis (dimethyl-n-butylcyclopentadienyl) zirconium dichloride, bis (n-butylcyclopentadienyl) zirconium dibromide Bis (n-butylcyclopentadienyl) zirconium methoxychloride, bis (n-butylcyclopentadienyl) zirconium ethoxychloride, bis (n-butylcyclopentadienyl) zirconium butoxychloride, bis (n-butylcyclopenta Dienyl) zirconium ethoxide, bis (n-butylcyclopentadienyl) zirconium methyl chloride, bis (n-butylcyclopentadienyl) zirconium dimethyl, bis (n-butylcyclopentadienyl) zirconium benzyl chloride, bis ( n-butylcyclopentadienyl) zirconium dibenzyl, bis (n-butylcyclopentadienyl) zirconium phenyl chloride, bis (n-butylcyclopentadienyl) zirconium hydride chloride, and the like. In the above examples, the disubstituted product of the cyclopentadienyl ring includes 1,2- and 1,3-substituted products, and the trisubstituted product includes 1,2,3- and 1,2,4-substituted products. Including. In the present invention, a transition metal compound in which zirconium metal is replaced with titanium metal or hafnium metal in the above-described zirconium compound can be used.

Among these transition metal compounds represented by the general formula (I), bis (n-propylcyclopentadienyl) zirconium dichloride, bis (n-butylcyclopentadienyl) zirconium dichloride, bis (1-methyl- 3-n-propylcyclopentadienyl) zirconium dichloride and bis (1-methyl-3-n-butylcyclopentadienyl) zirconium dichloride are particularly preferred.

The organoaluminum oxy compound (b) (hereinafter sometimes referred to as “component (b)”) may be a conventionally known benzene-soluble aluminoxane or disclosed in JP-A-2-276807. It may be a benzene insoluble organoaluminum oxy compound.

A conventionally known aluminoxane is, for example, an organoaluminum compound as described later and an adsorbed water, water of crystallization, ice, water vapor or the like, or an organoaluminum compound as described later and an organotin oxide. Can be made to react.

The particulate carrier (c) is an inorganic or organic compound, and a granular or particulate solid having a particle size of 10 to 300 μm, preferably 20 to 200 μm is used. Among these, as the inorganic carrier, porous oxides are preferable. Specifically, SiO ₂ , Al ₂ O ₃ , MgO, ZrO ₂ , TiO ₂ , B ₂ O ₃ , CaO, ZnO, BaO, ThO _2, etc. or these Illustrate mixtures such as SiO ₂ —MgO, SiO ₂ —Al ₂ O ₃ , SiO ₂ —TiO ₂ , SiO ₂ —V ₂ O ₅ , SiO ₂ —Cr ₂ O ₃ , SiO ₂ —TiO ₂ —MgO, etc. Can do. Among these, those containing at least one component selected from the group consisting of SiO ₂ and Al ₂ O ₃ as a main component are preferable.

The inorganic oxide includes a small amount of Na ₂ CO ₃ , K ₂ CO ₃ , CaCO ₃ , MgCO ₃ , Na ₂ SO ₄ , Al ₂ (SO ₄ ) ₃ , BaSO ₄ , KNO ₃ , Mg (NO ₃ ). ₂ , Al (NO ₃ ) ₃ , Na ₂ O, K ₂ O, Li ₂ O and other carbonates, sulfates, nitrates and oxide components may be contained.

The properties of such a particulate carrier (c) vary depending on the type and production method, but the particulate carrier preferably used in the present invention has a specific surface area of 50 to 1000 m ² / g, preferably 100 to 700 m ² / g. It is desirable that the pore volume be 0.3 to 2.5 cm ³ / g. The fine particle carrier is used after being calcined at 100 to 1000 ° C., preferably 150 to 700 ° C., if necessary.

Furthermore, examples of the particulate carrier include granular or particulate solids of organic compounds having a particle size of 10 to 300 μm. These organic compounds include (co) polymers mainly composed of α-olefins having 2 to 14 carbon atoms such as ethylene, propylene, 1-butene, 4-methyl-1-pentene, vinylcyclohexane, and styrene. Examples thereof include a polymer or copolymer as a main component.

The olefin polymerization catalyst used for the production of the ethylene / α-olefin copolymer (B) is formed from the above component (a), component (b) and (c) particulate carrier, but if necessary (d ) Organoaluminum compounds may be used.

Examples of the (d) organoaluminum compound (hereinafter sometimes referred to as “component (d)”) used as necessary include the organoaluminum compounds represented by the following general formula (III). it can.

R ¹ _n AlX _3-n (III)
(Wherein R ¹ represents a hydrocarbon group having 1 to 12 carbon atoms, X represents a halogen atom or a hydrogen atom, and n is 1 to 3)
In the general formula (III), R ¹ is a hydrocarbon group having 1 to 12 carbon atoms, such as an alkyl group, a cycloalkyl group, or an aryl group. Specifically, a methyl group, an ethyl group, n- Examples thereof include propyl group, isopropyl group, isobutyl group, pentyl group, hexyl group, octyl group, cyclopentyl group, cyclohexyl group, phenyl group, and tolyl group.

Specific examples of such organoaluminum compounds include the following compounds. Trialkylaluminum such as trimethylaluminum, triethylaluminum, triisopropylaluminum, triisobutylaluminum, trioctylaluminum, tri-2-ethylhexylaluminum; alkenylaluminum such as isoprenylaluminum; Dialkylaluminum halides such as aluminum chloride and dimethylaluminum bromide; alkylaluminum sesquichlorides such as methylaluminum sesquichloride, ethylaluminum sesquichloride, isopropylaluminum sesquichloride, butylaluminum sesquichloride and ethylaluminum sesquibromide; Aluminum dichloride, ethyl aluminum dichloride, isopropyl aluminum dichloride, alkyl aluminum dihalides such as ethyl aluminum dibromide; diethylaluminum hydride, and alkyl aluminum hydride such as diisobutyl aluminum hydride.

Further, as the organoaluminum compound (d), a compound represented by the following general formula (IV) can also be used.

R ¹ _n AlY _3-n (IV)
In the formula (IV), R ¹ represents the same hydrocarbon as R ¹ in the general formula (III), and Y represents —OR ² group, —OSiR ³ ₃ group, —OAlR ⁴ ₂ group, —NR ⁵ ₂ A group, —SiR ⁶ ₃ group or —N (R ⁷ ) AlR ⁸ ₂ group, n is 1 to 2, and R ² , R ³ , R ⁴ and R ⁸ are methyl group, ethyl group, isopropyl group, An isobutyl group, a cyclohexyl group, a phenyl group, and the like; R ⁵ is a hydrogen atom, a methyl group, an ethyl group, an isopropyl group, a phenyl group, a trimethylsilyl group, and the like; and R ⁶ and R ⁷ are a methyl group, an ethyl group, and the like. . )
Among such organoaluminum compounds, compounds represented by R ¹ _n Al (OAlR ⁴ ₂ ) _{3 -n} , such as Et ₂ AlOAlEt ₂ and (iso-Bu) ₂ AlOAl (iso-Bu) ₂ are preferable. .

Among the organoaluminum compounds represented by the general formulas (III) and (IV), a compound represented by the general formula R ¹ ₃ Al is preferable, and a compound in which R ¹ is an isoalkyl group is particularly preferable.

In producing the ethylene / α-olefin copolymer (B), by contacting the component (a), the component (b) and the particulate carrier (c) as described above, and the component (d) as necessary. The prepared catalyst is used.

Contact of each of the above components can be carried out in an inert hydrocarbon solvent. Specifically, as the inert hydrocarbon medium used for the preparation of the catalyst, propane, butane, pentane, hexane, heptane, octane, decane, Aliphatic hydrocarbons such as dodecane and kerosene; Alicyclic hydrocarbons such as cyclopentane, cyclohexane and methylcyclopentane; Aromatic hydrocarbons such as benzene, toluene and xylene; Halogenated carbonization such as ethylene chloride, chlorobenzene and dichloromethane Examples thereof include hydrogen or a mixture thereof.

The catalyst used for the production of the ethylene / α-olefin copolymer (B) is the presence of the component (a), the component (b), the particulate carrier (c) and, if necessary, the component (d). It may be a prepolymerization catalyst obtained by prepolymerizing an olefin below. The prepolymerization is performed by introducing an olefin into an inert hydrocarbon solvent in the presence of the component (a), the component (b), the particulate carrier (c), and the component (d) as necessary. It can be carried out.

Examples of the olefin used in the prepolymerization include ethylene and the same α-olefin having 3 to 20 carbon atoms as described above. Among these, ethylene used in the polymerization or a combination of ethylene and an α-olefin having 3 to 20 carbon atoms is particularly preferable.

The prepolymerization can be performed either batchwise or continuously, and can be performed under reduced pressure, normal pressure, or increased pressure. In the prepolymerization, the preliminary viscosity [η] measured in decalin at least 135 ° C. in the presence of hydrogen is in the range of 0.2 to 7 dl / g, preferably 0.5 to 5 dl / g. It is desirable to produce a polymer.

The ethylene / α-olefin copolymer (B) is obtained by polymerizing ethylene in the gas phase in the presence of the olefin polymerization catalyst or the prepolymerization catalyst as described above, or ethylene and an α-olefin having 3 to 20 carbon atoms. Is obtained by copolymerization in the gas phase. In addition, a chain transfer agent typified by hydrogen gas can be introduced as necessary, and the molecular weight of the polymer produced can be adjusted. As a result, the melt flow rate (MFR) (ASTM D-1238, It is possible to adjust the measurement temperature 190 ° C. and the load 2.16 kg).

In the polymerization, the olefin polymerization catalyst or the prepolymerization catalyst as described above is usually 10 ⁻⁸ to 10 ⁻³ gram atom / liter, preferably 10 ⁻⁷ to 10 in terms of the transition metal atom concentration in the polymerization reaction system. It is preferably used in an amount of 10 ^-4 gram atoms / liter.

In addition, the same organoaluminum oxy compound and / or organoaluminum compound (d) as component (b) may be added during polymerization. At this time, the atomic ratio (Al / M) of the aluminum atom (Al) derived from the organoaluminum oxy compound and the organoaluminum compound to the transition metal atom (M) derived from the transition metal compound (a) is 5 to 300. , Preferably 10 to 200, more preferably 15 to 150.

The polymerization temperature is usually in the range of 0 to 120 ° C, preferably 20 to 100 ° C. The polymerization pressure is usually from normal pressure to 100 kg / cm ² , preferably from 2 to 50 kg / cm ² , and the polymerization can be carried out in any of batch, semi-continuous and continuous systems. it can.

It is also possible to carry out the polymerization in two or more stages with different reaction conditions.

The ethylene / α-olefin copolymer (B) is produced by carrying out the above steps, but the requirement (B2) regarding the ethylene / α-olefin copolymer (B) is that of ethylene and α-olefin in the polymerization step. It can be adjusted by adjusting the ratio of the feed amount. The density can be lowered by increasing the α-olefin feed amount relative to the ethylene feed amount, and the density can be reduced by reducing the α-olefin feed amount relative to the ethylene feed amount. It can be raised.

The requirement (B3) regarding the ethylene / α-olefin copolymer (B) is that when ethylene or ethylene and α-olefin are fed in the above polymerization step, the feed amount of ethylene and α-olefin and the chain transfer agent are fed. Adjustment is possible by changing the ratio of the feed amount of hydrogen gas. The ethylene / α-olefin copolymer (B) melt by increasing the feed amount of hydrogen gas relative to the feed amount of ethylene and α-olefin when ethylene and α-olefin are fed The flow rate (MFR) (ASTM D-1238, measuring temperature 190 ° C, load 2.16 kg) is increased, and in the case of feeding ethylene or ethylene and α-olefin, the feed rate of ethylene and α-olefin is increased. On the other hand, the melt flow rate (MFR) (ASTM D-1238, measurement temperature 190 ° C., load 2.16 kg) of the ethylene / α-olefin copolymer (B) is lowered by reducing the feed amount of hydrogen gas.

[Nucleating agent]
The propylene-based resin composition of the present invention contains a nucleating agent.

The nucleating agent contained in the propylene resin composition of the present invention is not particularly limited, but a sorbitol nucleating agent, a phosphorus nucleating agent, a carboxylic acid metal salt nucleating agent, a polymer nucleating agent, an inorganic A compound or the like can be used. As the nucleating agent, a sorbitol nucleating agent, a phosphorus nucleating agent, or a polymer nucleating agent is preferably used.

Examples of sorbitol nucleating agents include nonitol, 1,2,3-trideoxy-4,6: 5,7-bis-O-[(4-propylphenyl) methylene] (nonitol 1,2,3 -trideoxy- 4,6: 5,7 -bis- O-[(4-propylphenyl) methylene]), 1,3,2,4-dibenzylidenesorbitol, 1,3,2,4-di- (p-methylbenzylidene) Sorbitol and 1,3-p-chlorobenzylidene-2,4-p-methylbenzylidene sorbitol can be used.

Examples of phosphorus nucleating agents include sodium bis- (4-t-butylphenyl) phosphate, potassium bis- (4-t-butylphenyl) phosphate, sodium-2,2′-ethylidene-bis ( 4,6-di-t-butylphenyl) phosphate, sodium-2,2'-methylene-bis (4,6-di-t-butylphenyl) phosphate, bis (2,4,8,10-tetra -T-Butyl-6-hydroxy-12H-dibenzo [d, g] [1,3,2] dioxaphosphocin-6-oxide) aluminum hydroxide salt can be used.

As the carboxylic acid metal salt nucleating agent, for example, pt-butyl aluminum benzoate, aluminum adipate, or sodium benzoate can be used.

As the polymer nucleating agent, a branched α-olefin polymer is preferably used. Examples of branched α-olefin polymers include 3-methyl-1-butene, 3-methyl-1-pentene, 3-ethyl-1-pentene, 4-methyl-1-pentene, 4-methyl-1-hexene 4,4-dimethyl-1-hexene, 4,4-dimethyl-1-pentene, 4-ethyl-1-hexene, a homopolymer of 3-ethyl-1-hexene, or a copolymer thereof, Can include copolymers of these with other α-olefins. A polymer of 3-methyl-1-butene is particularly preferred from the viewpoints of good transparency, low-temperature impact resistance, rigidity properties, and economical efficiency.

As the inorganic compound, for example, talc, mica and calcium carbonate can be used.

Among these nucleating agents, nonitol, 1,2,3-trideoxy-4,6: 5,7-bis-O — [((from the viewpoint of transparency, low temperature impact resistance, rigidity and low odor) 4-propiphenyl) methylene] and / or bis (2,4,8,10-tetra-t-butyl-6-hydroxy-12H-dibenzo [d, g] [1,3,2] dioxaphosphocin It is preferred to use a -6-oxide) aluminum hydroxide salt.

These nucleating agents may be used alone or in combination of two or more.

As the nucleating agent used in the present invention, commercially available products can be used. For example, nonitol, 1,2,3-trideoxy-4,6: 5,7-bis-O-[(4-propiphenyl) methylene ] Is commercially available under the trade name Millard NX8000 (made by Milliken), and ADK STAB NA-21 (trade name, made by ADEKA) is bis (2,4,8,10-tetra-t-butyl-6- Hydroxy-12H-dibenzo [d, g] [1,3,2] dioxaphosphocin-6-oxide) is commercially available as a nucleating agent containing an aluminum hydroxide salt as a main component.

The propylene-based resin composition of the present invention is excellent in rigidity and transparency of a molded body such as a container formed from the composition of the present invention by containing a nucleating agent. This is presumed to be due to an improvement in transparency due to a reduction in the spherulite size of crystals in the propylene-based resin composition and a reduction in diffused reflection of light, and an increase in rigidity due to an improvement in crystallinity.

Further, if the content of the nucleating agent is less than the following range, the effect of improving the rigidity and transparency is insufficient, and if the content of the nucleating agent is more than the following range, the further improving effect is small and economical. Not.

[Propylene resin composition]
The propylene resin composition of the present invention comprises 60 to 80 parts by weight of the above-mentioned propylene polymer (A), 20 to 40 parts by weight of ethylene / α-olefin copolymer (B) and 0.1 to 0 nucleating agent. 4 parts by weight (provided that the total of the propylene polymer (A) and the ethylene / α-olefin copolymer (B) is 100 parts by weight), preferably the propylene polymer (A) 70 to 78 Parts by weight, 22-30 parts by weight of ethylene / α-olefin copolymer (B) and 0.15-0.35 parts by weight of a nucleating agent.

In addition, the propylene resin composition of the present invention is appropriately neutralized, antioxidant, heat stabilizer, weathering agent, lubricant, ultraviolet absorber, antistatic agent, antiblocking agent within the range not impairing the object of the present invention. Additives such as antifogging agents, antifoaming agents, dispersants, flame retardants, antibacterial agents, fluorescent whitening agents, cross-linking agents, cross-linking aids; and other components exemplified by colorants such as dyes and pigments You may go out.

When the propylene-based resin composition of the present invention contains other components, the total amount of the propylene-based polymer (A) and the ethylene / α-olefin copolymer (B) is 100 parts by weight. It is contained in the range of 01 to 5 parts by weight.

The propylene resin composition of the present invention preferably has a melt flow rate (MFR) (measuring temperature 230 ° C., load 2.16 kg) of 20 to 100 g / 10 minutes, preferably 30 to 80 g / 10 minutes. More preferred is 40 to 70 g / 10 min. In the said range, since it is excellent in the fluidity | liquidity at the time of shape | molding molded objects, such as a container, using a propylene-type resin composition, it is preferable.

The melt flow rate (MFR) (ASTM D-1238, measurement temperature 230 ° C., load 2.16 kg) of the propylene-based resin composition is the melt flow rate of the propylene-based polymer (A) used in the propylene-based resin composition ( MFR) (ASTM D-1238, measuring temperature 230 ° C., load 2.16 kg), or melt flow rate (MFR) of ethylene / α-olefin copolymer (ASTM D-1238, measuring temperature 190 ° C., load 2.16 kg) ) Can be selected as appropriate.

In addition to the methods described above, adjustment can be made by coexisting an organic peroxide when each component is melt-kneaded with a kneader. That is, by adding an organic peroxide during melt-kneading, or by increasing the amount of organic peroxide added during melt-kneading, the melt flow rate (MFR) of the propylene-based resin composition (ASTM D -1238, measurement temperature 230 ° C., load 2.16 kg) can be increased. The organic peroxide that can be used in the present invention is not particularly limited, but benzoyl peroxide, t-butyl perbenzoate, t-butyl peracetate, t-butyl peroxyisopropyl carbonate, 2,5-di-oxide. -Methyl-2,5-di- (benzoylperoxy) hexane, 2,5-di-methyl-2,5-di- (benzoylperoxy) hexyne-3, t-butyl-diperadipate, t- Butylperoxy-3,5,5-trimethylhexanoate, methyl-ethylketone peroxide, cyclohexanone peroxide, di-t-butyl peroxide, dichymyl peroxide, 2,5-di-methyl-2,5 -Di- (t-butylperoxy) hexane, 2,5, -di-methyl-2,5-di- (t-butylperoxy) hexyne-3,1,3-bis- (t-butyl Luperoxyisopropyl) benzene, t-butylchymyl peroxide, 1,1-bis- (t-butylperoxy) -3,3,5-trimethylcyclohexane, 1,1-bis- (t-butylperoxy) Cyclohexane, 2,2-bis- (t-butylperoxy) butane, p-menthane hydroperoxide, di-isopropylbenzene hydroperoxide, cumene hydroperoxide, t-butyl hydroperoxide, p-cymene hydroper Examples thereof include organic peroxides such as oxide, 1,1,3,3-tetra-methylbutyl hydroperoxide or 2,5-di-methyl-2,5-di- (hydroperoxy) hexane. Of these, 2,5-di-methyl-2,5-di- (benzoylperoxy) hexane and 1,3-bis- (t-butylperoxyisopropyl) benzene are more preferred. When organic peroxide is used, it should be used in an amount of 0.005 to 0.05 parts by weight based on 100 parts by weight of the total of propylene polymer (A) and ethylene / α-olefin copolymer (B). Is desirable.

The propylene resin composition of the present invention preferably has a tensile modulus of 1300 to 1800 MPa, more preferably 1350 to 1700 MPa.

The tensile elastic modulus of the propylene-based resin composition of the present invention is obtained by injection-molding the composition at a cylinder temperature of 200 ° C. and a mold temperature of 40 ° C. using an injection molding machine having a clamping force of 110 tons. It is measured by using a test piece for tensile elastic modulus obtained (ISO test piece type (type A type)). The tensile elastic modulus of the propylene-based resin composition of the present invention is measured according to the tensile elastic modulus test method defined in ISO 527-2 using the tensile elastic modulus test piece ISO test piece type (type A type). Value. The tensile measurement temperature is 23 ° C. and the test speed is 1 mm / min.

When the tensile elastic modulus of the propylene-based resin composition of the present invention is within the above range, the molded body including a container such as a food packaging container has a high rigidity and a large load even if it is thinner and lighter than before. Even if it takes, it is hard to deform.

The tensile elastic modulus of the propylene-based resin composition of the present invention can be adjusted by the content ratio and crystallinity of the D _insol part. The crystallinity can be controlled by known means such as the stereoregularity of the D _insol part, the content of propylene and other olefins introduced as necessary, and the introduction of a nucleating agent. Stereoregularity can be controlled by known means such as the type of catalyst and polymerization temperature.

The propylene-based resin composition of the present invention has a so-called sea-island structure in which D _insol is mainly a continuous phase, that is, a sea phase. D _sol and the ethylene / α-olefin copolymer (B) mainly constitute an island layer. For this reason, the propylene-based resin composition of the present invention can achieve both high rigidity and impact resistance.

Moreover, it is preferable that the propylene-based resin composition of the present invention satisfies the following requirement (X1).

(Requirement (X1))
In the propylene-based resin composition of the present invention, the width in the depth direction of the dark portion determined by TEM observation of the skin layer of the molded body molded under specific conditions is 0.4 μm or less. The molded body was an injection molding machine with a clamping force of 100 tons, cylinder temperature 200 ° C., mold temperature 40 ° C., injection primary pressure 1700 Kg / cm ² , injection speed 30 mm / sec, holding pressure primary pressure 350 kg. It is obtained by injection-molding a propylene-based resin composition pellet under the conditions of / cm ² , primary pressure holding time of 4 sec, and pressure holding speed of 4 mm / sec, and molded into a length of 129 mm, a width of 119 mm, and a thickness of 1 mm. Then, a test piece (ultra-thin slice) for TEM observation is obtained by the following ordinary method.

The surface of the molded body is cut out with a knife or the like, and the cut piece is resin-embedded by a conventional method. The resin-embedded cut piece is enclosed in a glass bottle together with RuO ₄ crystals and dyed. (Mainly the D _sol component and the ethylene / α-olefin copolymer (B) part are dyed.) Then, an ultra-thin section having a thickness of about 50 to 120 nm is prepared by cutting at room temperature using an ultramicrotome.

In the propylene-based resin composition of the present invention, in the image obtained by TEM observation of this ultrathin slice, the skin layer (layer having a depth of 2 to 5 μm from the surface of the molded body) from the surface of the dyed portion to the center portion. The width in the direction (depth direction) is preferably 0.4 μm or less at the maximum. The width in the depth direction is a value in the case of observing two arbitrary places of 5 μm square.

The propylene polymer composition of the present invention has a depth direction width of 0.7 μm in the dark portion of the core layer (a layer having a depth of 50 to 60 μm from the specimen surface) by the same TEM observation method as described above. The following is preferable, 0.2 to 0.6 μm is more preferable, and 0.3 to 0.6 μm is more preferable.

It should be noted that the resin embedding by the conventional method is performed for protecting the surface of the cut specimen, and it is considered that there is no influence on the sea-island structure of the specimen.

The propylene-based resin composition of the present invention contains specific amounts of the above-mentioned propylene-based polymer (A), ethylene / α-olefin copolymer (B) and nucleating agent, and has a unique sea-island structure as described above. Tend.

When the propylene-based resin composition of the present invention satisfies the requirement (X1), the rigidity, impact resistance and transparency can be compatible at a high level. This is presumably because the so-called sea-island structure is finely dispersed, so that there is little irregular reflection and the area of the sea-island interface is widened, so that the impact resistance mainly due to the D _sol component is efficiently expressed.

Since the propylene-based resin composition of the present invention includes the above-described components in the above range, when a molded body including a container such as a food packaging container is manufactured, it is a case where the thickness is reduced and the weight is reduced as compared with the conventional case. Excellent rigidity, low-temperature impact resistance, and transparency.

The method for producing the propylene-based resin composition of the present invention is not particularly limited, and examples of the production method include a method for producing a propylene-based resin composition by melting and kneading each component with a kneader. Examples of the kneader include a single-screw kneading extruder, a multi-shaft kneading extruder, a kneader, a Banbury mixer, and a Henschel mixer. The melt-kneading conditions are not particularly limited as long as the molten resin does not deteriorate due to shearing during kneading, heating temperature, heat generation due to shearing, and the like. From the viewpoint of preventing the deterioration of the molten resin, it is effective to set the heating temperature appropriately or to add an antioxidant or a heat stabilizer.

Various molded products can be obtained by molding the propylene-based resin composition of the present invention according to a known molding technique. Molding technologies include, for example, injection molding, injection stretch blow molding, compression molding, injection compression molding, T-die film molding, stretched film molding, inflation film molding, sheet molding, calendar molding, pressure molding, vacuum molding, pipe molding, and atypical. Examples include extrusion molding, hollow molding, and laminate molding.

Examples of the molded body formed from the propylene-based resin composition of the present invention include containers, household appliance parts, daily necessities and the like. Among these, containers are preferable from the viewpoint of impact resistance and rigidity.

The container of the present invention is formed from the aforementioned propylene-based resin composition. Containers include liquid containers for daily necessities such as shampoos, hair preparations, cosmetics, detergents, and disinfectants; food packaging containers for liquids such as soft drinks, water, and seasonings; solids such as jelly, pudding, and yogurt It can be used in a wide range of packaging containers for foods; packaging containers for other chemicals; packaging containers for industrial liquids.

Above all, it can be suitably used as a food packaging container that is required to be thinner and lighter than conventional ones, and that is excellent in the visibility of the contents and is required to have less odor.

A container (for example, a food packaging container) formed from the propylene-based resin composition of the present invention is preferably obtained by injection molding or injection stretch blow molding.

As a method of injection molding, for example, molding can be performed by the following method using an injection molding machine. First, a propylene resin composition is introduced into a hopper of an injection mechanism, and the propylene resin composition is fed into a cylinder heated to approximately 200 ° C. to 250 ° C., and is kneaded and plasticized to be in a molten state. This is a metal mold closed by a mold-clamping mechanism which is adjusted to 5 to 50 ° C., preferably 30 to 50 ° C. with cooling water or hot water at high pressure and high speed (maximum pressure 700 to 1500 kg / cm ³ ) from the nozzle. Injection into the mold. It can be carried out by cooling and solidifying the propylene-based resin composition injected by cooling from the mold, opening the mold with a mold clamping mechanism, and obtaining a molded product.

As an injection stretch blow molding, for example, a propylene resin composition is introduced into a hopper of an injection molding machine, the resin is fed into a cylinder heated to about 200 ° C. to 250 ° C., and is kneaded and plasticized into a molten state. To do. This is a metal mold closed by a mold-clamping mechanism which is adjusted to a temperature of 5 to 50 ° C., preferably 10 to 30 ° C. with cooling water or hot water at high pressure and high speed (maximum pressure 700 to 1500 kg / cm ³ ) from the nozzle. It is injection molded into a mold, where it is cooled for 1.0 to 3.0 seconds to form a preform, then immediately the mold is opened and stretched and oriented in the longitudinal direction using a stretching rod, and further in the transverse direction by blow molding. It can be performed by stretching and orientation to obtain a molded product.

Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited thereto.

[Production of Propylene Polymer (A-1)]
(1) Preparation of solid catalyst component An anhydrous magnesium chloride 95.2 g, decane 442 ml, and 2-ethylhexyl alcohol 390.6 g were heated at 130 ° C. for 2 hours to form a homogeneous solution. .3 g was added, and further stirred and mixed at 130 ° C. for 1 hour to dissolve phthalic anhydride.

After cooling the homogeneous solution thus obtained to room temperature, 75 ml of this homogeneous solution was charged dropwise into 200 ml of titanium tetrachloride maintained at −20 ° C. over 1 hour. After the completion of charging, the temperature of the mixed solution was raised to 110 ° C. over 4 hours, and when it reached 110 ° C., 5.22 g of diisobutyl phthalate (DIBP) was added, followed by stirring at the same temperature for 2 hours. Retained.

After completion of the reaction for 2 hours, the solid part was collected by hot filtration, and the solid part was resuspended in 275 ml of titanium tetrachloride and then heated again at 110 ° C. for 2 hours. After completion of the reaction, the solid part was again collected by hot filtration, and washed thoroughly with decane and hexane at 110 ° C. until no free titanium compound was detected in the solution.

Here, the detection of the said free titanium compound was confirmed with the following method. 10 ml of the supernatant of the above solid catalyst component was collected with a syringe into a 100 ml branched Schlenk previously purged with nitrogen and charged. Next, the solvent hexane was dried in a nitrogen stream, and further vacuum-dried for 30 minutes. This was charged with 40 ml of ion-exchanged water and 10 ml of 50% by volume sulfuric acid and stirred for 30 minutes. This aqueous solution was transferred to a 100 ml volumetric flask through a filter paper, followed by conc. As a masking agent for iron (II) ions. 1 ml of H ₃ PO ₄ and ₅ ml of 3% H ₂ O ₂ aqueous solution were added as a coloring reagent for titanium, and the volume was further increased to 100 ml with ion-exchanged water. The volumetric flask was shaken and mixed, and after 20 minutes, the absorbance at 420 nm was observed using UV to detect free titanium. Free titanium was removed by washing and free titanium was detected until this absorption was not observed.

The solid titanium catalyst component (A) prepared as described above was stored as a decane slurry, but a part of this was dried for the purpose of examining the catalyst composition. The composition of the solid titanium catalyst component (A) thus obtained was 2.3% by weight of titanium, 61% by weight of chlorine, 19% by weight of magnesium, and 12.5% by weight of DIBP.

(2) Preparation of prepolymerization catalyst component A three-necked flask with a stirrer having an internal volume of 500 ml was replaced with nitrogen gas, and then 400 ml of dehydrated heptane, 19.2 mmol of triethylaluminum, 3.8 mmol of dicyclopentyldimethoxysilane, and the above 4 g of solid titanium catalyst component (A) was added. The internal temperature was kept at 20 ° C., and propylene was introduced while stirring. After 1 hour, stirring was stopped, and as a result, a prepolymerized catalyst component (B) in which 2 g of propylene was polymerized per 1 g of the solid titanium catalyst component (A) was obtained.

(3-1) Polymerization-1 (Polymerization [Step 1])
A stainless steel autoclave with a stirrer with an internal volume of 10 l was sufficiently dried, and after substitution with nitrogen, 6 l of dehydrated heptane, 12.5 mmol of triethylaluminum, and 0.6 mmol of dicyclopentyldimethoxysilane were added. After replacing nitrogen in the system with propylene, hydrogen was charged at 0.30 MPa-G, and then propylene was introduced with stirring. After the system was stabilized at an internal temperature of 80 ° C. and a total pressure of 0.8 MPa-G, 20.8 ml of heptane slurry containing 0.10 mmol of the above prepolymerized catalyst component (B) in terms of Ti atom was added, and propylene was continuously added. Polymerization was carried out at 80 ° C. for 3 hours while supplying to the reactor.

(3-2) Polymerization-2 (Polymerization [Step 2])
After completion of the polymerization of the propylene homopolymer (after [Step 1]), the internal temperature was lowered to 30 ° C. and the pressure was released. Thereafter, 0.10 MPa-G of hydrogen was charged, and subsequently a mixed gas of propylene / ethylene: (4.0 l / min) / (2.4 l / min) was introduced. Propylene / ethylene copolymerization was carried out at an internal temperature of 60 ° C. and a total pressure of 0.30 MPa-G for 60 minutes.

When a predetermined time had elapsed, 50 ml of methanol was added to stop the reaction, and the temperature was lowered and the pressure was released. The entire contents were transferred to a filtration tank equipped with a filter, heated to 60 ° C., and solid-liquid separated. Furthermore, the solid part was washed twice with 6 l of 60 ° C. heptane. The propylene / ethylene copolymer thus obtained was vacuum-dried. The resulting propylene polymer (A-1) has a melt flow rate (MFR) (ASTM D-1238, measurement temperature 230 ° C., load 2.16 kg) of 89 g / 10 minutes, and D _insol is 92.02% by weight. , D _sol is 7.98 wt%, [η _sol ] is 1.77 dl / g, the weight of structural units derived from ethylene in D _sol is 30.9 wt%, and [η _insol ] is 0.92 dl / g. Met.

[Production of propylene polymer (A-2)]
In the production of the propylene polymer (A-1), polymerization was carried out in the same manner as in the production of the propylene polymer (A-1), except that the propylene / ethylene copolymerization of polymerization-2 was carried out for 40 minutes. The resulting propylene polymer (A-2) has a melt flow rate (MFR) (ASTM D-1238, measurement temperature 230 ° C., load 2.16 kg) of 107 g / 10 minutes, and D _insol is 93.80 wt%. , D _sol is 6.20 wt%, [η _sol ] is 1.77 dl / g, the weight of the structural unit derived from ethylene in D _sol is 30.9 wt%, and [η _insol ] is 0.89 dl / g. Met.

[Production of propylene polymer (A-3)]
In the production of the propylene polymer (A-1), polymerization was carried out in the same manner as in the production of the propylene polymer (A-1), except that the propylene / ethylene copolymerization of polymerization-2 was carried out for 30 minutes. The resulting propylene polymer (A-3) has a melt flow rate (MFR) (ASTM D-1238, measuring temperature 230 ° C., load 2.16 kg) of 55 g / 10 minutes, and D _insol is 95.80 wt%. D _sol is 4.20% by weight, [η _sol ] is 1.82 dl / g, the weight of the structural unit derived from ethylene in D _sol is 29.2% by weight, and [η _insol ] is 0.91 dl / g. Met.

[Production of Propylene Polymer (A-c1)]
In the production of the propylene polymer (A-1), the polymerization was carried out in the same manner as the production of the propylene polymer (A-1) except that the propylene / ethylene copolymerization of polymerization-2 was carried out for 70 minutes. The resulting propylene-based polymer (A-c1) has a melt flow rate (MFR) (ASTM D-1238, measuring temperature 230 ° C., load 2.16 kg) of 74 g / 10 minutes, and D _insol is 90.25% by weight. , D _sol is 9.75 wt%, [η _sol ] is 1.77 dl / g, the weight of the structural unit derived from ethylene in D _sol is 30.9 wt%, and [η _insol ] is 0.94 dl / g. Met.

[Production of propylene polymer (A-c2)]
In the production of the propylene polymer (A-1), the propylene / ethylene copolymerization of polymerization-2 was conducted at a total pressure of 0.50 MPa-G for 120 minutes. Polymerization was carried out in the same manner. The resulting propylene polymer (A-c2) has a melt flow rate (MFR) (ASTM D-1238, measurement temperature 230 ° C., load 2.16 kg) of 74 g / 10 minutes, and D _insol is 82.50 wt%. , D _sol is 17.50 wt%, [η _sol ] is 1.94 dl / g, the weight of the structural unit derived from ethylene in D _sol is 31.0 wt%, and [η _insol ] is 0.81 dl / g. Met.

[Production of Propylene Polymer (Ac3)]
In the production of the propylene polymer (Ac2), polymerization was carried out in the same manner as in the production of the propylene polymer (Ac2) except that the propylene / ethylene copolymerization of polymerization-2 was carried out for 90 minutes. The resulting propylene polymer (Ac3) has a melt flow rate (MFR) (ASTM D-1238, measuring temperature 230 ° C., load 2.16 kg) of 89 g / 10 min, and D _insol is 85.70 wt%. D _sol is 14.30% by weight, [η _sol ] is 1.94 dl / g, the weight of the structural unit derived from ethylene in D _sol is 31.0% by weight, and [η _insol ] is 0.81 dl / g. Met.

[Production of Propylene Polymer (Ac4)]
In the production of the propylene polymer (Ac2), the polymerization was carried out in the same manner as the production of the propylene polymer (Ac2) except that the propylene / ethylene copolymerization of polymerization-2 was carried out for 60 minutes. The resulting propylene polymer (Ac4) has a melt flow rate (MFR) (ASTM D-1238, measuring temperature 230 ° C., load 2.16 kg) of 107 g / 10 min, and D _insol is 88.80 wt%. , D _sol is 11.20 wt%, [η _sol ] is 1.94 dl / g, the weight of the structural unit derived from ethylene in D _sol is 31.0 wt%, and [η _insol ] is 0.81 dl / g. Met.

[Production of Propylene Polymer (Ac5)]
In the production of the propylene polymer (A-1), the hydrogen charged in the polymerization-1 (propylene homopolymerization) was set to 0.20 MPa-G, and the propylene / ethylene copolymerization in the polymerization-2 propylene / ethylene :( Polymerization was carried out in the same manner as in the production of the propylene polymer (A-1) except that a mixed gas of 4.0 l / min) / (2.0 l / min) was introduced for 30 minutes. The resulting propylene polymer (Ac5) has a melt flow rate (MFR) (ASTM D-1238, measuring temperature 230 ° C., load 2.16 kg) of 102 g / 10 minutes, and D _insol is 95.03 wt%. , D _sol is 4.97 wt%, [η _sol ] is 1.83 dl / g, the weight of structural units derived from ethylene in D _sol is 24.1 wt%, and [η _insol ] is 1.10 dl / g. Met.

[Production of Propylene Polymer (Ac6)]
In the production of the propylene-based polymer (A-1), the hydrogen charged in the polymerization-1 (at the time of propylene homopolymerization) was 0.20 MPa-G, and the hydrogen was charged in the 0.1 MPa-G charge during the polymerization-2. And then propylene polymer, except that the total pressure at which the mixed gas of propylene / ethylene: (4.0 l / min) / (2.4 l / min) was charged was 0.50 MPa-G for 30 minutes. Polymerization was carried out in the same manner as in the production of (A-1). The resulting propylene polymer (Ac6) has a melt flow rate (MFR) (ASTM D-1238, measuring temperature 230 ° C., load 2.16 kg) of 55 g / 10 min, and D _insol is 95.80 wt%. , D _sol is 4.20 wt%, [η _sol ] is 2.35 dl / g, the weight of the structural unit derived from ethylene in D _sol is 29.2 wt%, and [η _insol ] is 1.08 dl / g. Met.

[Production of propylene polymer (A-4)]
(1) Preparation of Solid Titanium Catalyst Component A vibration mill equipped with four grinding pots with an internal volume of 4 L containing 9 kg of steel balls with a diameter of 12 mm was prepared. To each pot, 300 g of magnesium chloride, 115 mL of diisobutyl phthalate, and 60 mL of titanium tetrachloride were added in a nitrogen atmosphere and ground for 40 hours.

75 g of the co-ground product obtained by the above pulverization was placed in a 5 L flask and 1.5 L of toluene was added, stirred at 114 ° C. for 30 minutes, and then allowed to stand to remove the supernatant. Next, the solid content was washed three times at 20 ° C. using 1.5 L of n-heptane soot and further dispersed in 1.5 L of n-heptane to obtain a transition metal catalyst component slurry. The obtained transition metal catalyst component contained 2% by weight of titanium and 18% by weight of diisobutyl phthalate.

(2) Production of prepolymerization catalyst 115 g of the above transition metal catalyst component, 65.6 mL of triethylaluminum, 22.1 mL of 2-isobutyl-2-isopropyl-1,3-dimethoxypropane, and 115 L of heptane were placed in an autoclave equipped with a stirrer with an internal volume of 200 L. The inner temperature was kept at 5 ° C., 1150 g of propylene was inserted, and the reaction was carried out with stirring for 60 minutes. After completion of the polymerization, 15.8 mL of titanium tetrachloride was charged and used as a prepolymerization catalyst. This prepolymerization catalyst contained 10 g of polypropylene per 1 g of the transition metal catalyst component.

(3) Main polymerization Into a vessel polymerization vessel with an internal capacity of 1000 L, 140 kg / hour of propylene, 1.2 g / hour of the prepolymerized catalyst as a transition metal catalyst component, 20.9 ml / hour of triethylaluminum, dicyclopentyldimethoxysilane 2.3 mL / hour was continuously supplied, and hydrogen was supplied so that the hydrogen concentration in the gas phase was 13.0 mol%. Polymerization was performed at a polymerization temperature of 67.5 ° C. and a pressure of 3.5 MPa / G.

The obtained slurry was sent to a vessel polymerization vessel equipped with a stirrer having an internal volume of 500 L and further polymerized. To the polymerization vessel, propylene was supplied at 30 kg / hour, and hydrogen was supplied so that the hydrogen concentration in the gas phase was 8.9 mol%. Polymerization was performed at a polymerization temperature of 68 ° C. and a pressure of 3.4 MPa / G.

The obtained slurry was sent to a vessel polymerization vessel equipped with a stirrer having an internal volume of 500 L and further polymerized. To the polymerization reactor, propylene was supplied at 20 kg / hour, and hydrogen was supplied so that the hydrogen concentration in the gas phase was 7.3 mol%. Polymerization was performed at a polymerization temperature of 68.5 ° C. and a pressure of 3.3 MPa / G.

The obtained slurry was sent to a vessel polymerization vessel equipped with a stirrer having an internal volume of 500 L and further polymerized. The polymerization vessel was charged with ethylene so that propylene was 15 kg / hour, hydrogen was a hydrogen concentration in the gas phase portion of 7.2 mol%, a polymerization temperature of 60 ° C., and a pressure of 3.2 MPa / G. Diethylene glycol ethyl acetate was added at a ratio of 100 moles per Ti component in the transition metal catalyst component.

The resulting slurry was gas-solid separated after being deactivated and vaporized. The propylene polymer was obtained at 78 kg / h. The obtained propylene polymer was introduced into a dryer and vacuum-dried at 80 ° C.

The resulting propylene polymer (A-4) has a melt flow rate (MFR) (ASTM D-1238, measuring temperature 230 ° C., load 2.16 kg) of 120 g / 10 min, and D _insol of 93.90% by weight. , D _sol is 6.10 wt%, [η _sol ] is 1.40 dl / g, the weight of structural units derived from ethylene in D _sol is 26.7 wt%, and [η _insol ] is 0.89 dl / g. Met.

[Production of propylene polymer (A-5)]
The polymerization was carried out in the same manner as in the production of the propylene polymer (A-4) except that the polymerization method was changed as follows.

(1) Main polymerization Into a vessel polymerization vessel with an internal volume of 1000 L, 140 kg / hour of propylene, 1.2 g / hour of the above prepolymerized catalyst as a transition metal catalyst component, 20.9 ml / hour of triethylaluminum, dicyclopentyldimethoxysilane 2.3 mL / hour was continuously supplied, and hydrogen was supplied so that the hydrogen concentration in the gas phase was 12.5 mol%. Polymerization was performed at a polymerization temperature of 67.5 ° C. and a pressure of 3.5 MPa / G.

The obtained slurry was sent to a vessel polymerization vessel equipped with a stirrer having an internal volume of 500 L and further polymerized. Propylene was supplied to the polymerization vessel at 30 kg / hour, and hydrogen was supplied so that the hydrogen concentration in the gas phase portion was 8.5 mol%. Polymerization was performed at a polymerization temperature of 68 ° C. and a pressure of 3.4 MPa / G.

The obtained slurry was sent to a vessel polymerization vessel equipped with a stirrer having an internal volume of 500 L and further polymerized. To the polymerization vessel, propylene was supplied at 20 kg / hour, and hydrogen was supplied so that the hydrogen concentration in the gas phase was 6.9 mol%. Polymerization was performed at a polymerization temperature of 68.5 ° C. and a pressure of 3.3 MPa / G.

The obtained slurry was sent to a vessel polymerization vessel equipped with a stirrer having an internal volume of 500 L and further polymerized. The polymerization vessel was charged with ethylene such that propylene was 15 kg / hour, hydrogen was 6.7 mol% in the gas phase, the polymerization temperature was 57 ° C., and the pressure was 3.2 MPa / G. Diethylene glycol ethyl acetate was added at a molar ratio of 108 moles per Ti component in the transition metal catalyst component.

The resulting slurry was gas-solid separated after being deactivated and vaporized. The propylene polymer was obtained at 77 kg / h. The obtained propylene polymer was introduced into a dryer and vacuum-dried at 80 ° C.

The resulting propylene polymer (A-5) has a melt flow rate (MFR) (ASTM D-1238, measuring temperature 230 ° C., load 2.16 kg) of 118 g / 10 min, and D _insol of 94.60 wt%. D _sol is 5.40% by weight, [η _sol ] is 1.45 dl / g, the weight of the structural unit derived from ethylene in D _sol is 30.0% by weight, and [η _insol ] is 0.88 dl / g. Met.

[Production of propylene polymer (A-6)]
The polymerization was carried out in the same manner as in the production of the propylene polymer (A-4) except that the polymerization method was changed as follows.

(1) Main polymerization Into a vessel polymerization vessel with an internal volume of 1000 L, 140 kg / hour of propylene, 1.2 g / hour of the above prepolymerized catalyst as a transition metal catalyst component, 20.9 ml / hour of triethylaluminum, dicyclopentyldimethoxysilane 2.3 mL / hour was continuously supplied, and hydrogen was supplied so that the hydrogen concentration in the gas phase was 11.85 mol%. Polymerization was performed at a polymerization temperature of 67.5 ° C. and a pressure of 3.4 MPa / G.

The obtained slurry was sent to a vessel polymerization vessel equipped with a stirrer having an internal volume of 500 L and further polymerized. To the polymerization reactor, propylene was supplied at 30 kg / hour, and hydrogen was supplied so that the hydrogen concentration in the gas phase was 8.0 mol%. Polymerization was performed at a polymerization temperature of 68 ° C. and a pressure of 3.3 MPa / G.

The obtained slurry was sent to a vessel polymerization vessel equipped with a stirrer having an internal volume of 500 L and further polymerized. Propylene was supplied to the polymerization vessel at 20 kg / hour, and hydrogen was supplied so that the hydrogen concentration in the gas phase portion was 6.5 mol%. Polymerization was performed at a polymerization temperature of 68.5 ° C. and a pressure of 3.2 MPa / G.

The obtained slurry was sent to a vessel polymerization vessel equipped with a stirrer having an internal volume of 500 L and further polymerized. The polymerization vessel was charged with ethylene such that propylene was 15 kg / hour, hydrogen was 2.3 mol% in the gas phase, the polymerization temperature was 60 ° C., and the pressure was 3.0 MPa / G. Diethylene glycol ethyl acetate was added at a mole ratio of 109 moles per Ti component in the transition metal catalyst component.

The resulting propylene polymer (A-6) has a melt flow rate (MFR) (ASTM D-1238, measuring temperature 230 ° C., load 2.16 kg) of 105 g / 10 minutes, and D _insol is 94.70 wt%. , D _sol is 5.30 wt%, [η _sol ] is 2.30 dl / g, the weight of the structural unit derived from ethylene in D _sol is 26.5 wt%, and [η _insol ] is 0.90 dl / g. Met.

[Production of propylene polymer (A-7)]
The polymerization was carried out in the same manner as in the production of the propylene polymer (A-4) except that the polymerization method was changed as follows.

(1) Main polymerization Into a vessel polymerization vessel with an internal volume of 1000 L, 140 kg / hour of propylene, 1.2 g / hour of the above prepolymerized catalyst as a transition metal catalyst component, 20.9 ml / hour of triethylaluminum, dicyclopentyldimethoxysilane 2.3 mL / hour was continuously supplied, and hydrogen was supplied so that the hydrogen concentration in the gas phase was 13.5 mol%. Polymerization was performed at a polymerization temperature of 67.5 ° C. and a pressure of 3.5 MPa / G.

The obtained slurry was sent to a vessel polymerization vessel equipped with a stirrer having an internal volume of 500 L and further polymerized. Propylene was supplied to the polymerization vessel at 30 kg / hour, and hydrogen was supplied so that the hydrogen concentration in the gas phase was 9.2 mol%. Polymerization was performed at a polymerization temperature of 68 ° C. and a pressure of 3.4 MPa / G.

The obtained slurry was sent to a vessel polymerization vessel equipped with a stirrer having an internal volume of 500 L and further polymerized. To the polymerization reactor, propylene was supplied at 20 kg / hour, and hydrogen was supplied so that the hydrogen concentration in the gas phase was 7.5 mol%. Polymerization was performed at a polymerization temperature of 68.5 ° C. and a pressure of 3.3 MPa / G.

The obtained slurry was sent to a vessel polymerization vessel equipped with a stirrer having an internal volume of 500 L and further polymerized. The polymerization vessel was charged with ethylene so that propylene was 15 kg / hour, hydrogen was 3.2 mol% in the gas phase, the polymerization temperature was 60 ° C., and the pressure was 3.1 MPa / G. Diethylene glycol ethyl acetate was added at a ratio of 101 moles per Ti component in the transition metal catalyst component.

The resulting propylene polymer (A-7) has a melt flow rate (MFR) (ASTM D-1238, measurement temperature 230 ° C., load 2.16 kg) of 120 g / 10 minutes, and D _insol is 94.00% by weight. , D _sol is 6.00 wt%, [η _sol ] is 2.00 dl / g, the weight of the structural unit derived from ethylene in D _sol is 27.7 wt%, and [η _insol ] is 0.90 dl / g. Met.

[Production of Propylene Polymer (Ac7)]
The polymerization was carried out in the same manner as in the production of the propylene polymer (A-4) except that the polymerization method was changed as follows.

(1) Main polymerization Into a vessel polymerization vessel with an internal volume of 1000 L, 140 kg / hour of propylene, 1.4 g / hour of the above prepolymerization catalyst as a transition metal catalyst component, 20.9 ml / hour of triethylaluminum, dicyclopentyldimethoxysilane 2.6 mL / hour was continuously supplied, and hydrogen was supplied so that the hydrogen concentration in the gas phase was 16.2 mol%. Polymerization was performed at a polymerization temperature of 63.5 ° C. and a pressure of 3.5 MPa / G.

The obtained slurry was sent to a vessel polymerization vessel equipped with a stirrer having an internal volume of 500 L and further polymerized. Propylene was supplied to the polymerization vessel at 30 kg / hour, and hydrogen was supplied so that the hydrogen concentration in the gas phase was 12.4 mol%. Polymerization was performed at a polymerization temperature of 64.5 ° C. and a pressure of 3.4 MPa / G.

The obtained slurry was sent to a vessel polymerization vessel equipped with a stirrer having an internal volume of 500 L and further polymerized. To the polymerization vessel, propylene was supplied at 20 kg / hour, and hydrogen was supplied so that the hydrogen concentration in the gas phase was 7.9 mol%. Polymerization was performed at a polymerization temperature of 67 ° C. and a pressure of 3.3 MPa / G.

The obtained slurry was sent to a vessel polymerization vessel equipped with a stirrer having an internal volume of 500 L and further polymerized. The polymerization vessel was charged with ethylene such that propylene was 15 kg / hour, hydrogen was 4.8 mol% in the gas phase, the polymerization temperature was 60 ° C., and the pressure was 3.2 MPa / G. Diethylene glycol ethyl acetate was added at a ratio of 86 moles per Ti component in the transition metal catalyst component.

The resulting slurry was gas-solid separated after being deactivated and vaporized. The propylene polymer was obtained at 75 kg / h. The obtained propylene polymer was introduced into a dryer and vacuum-dried at 80 ° C.

The resulting propylene polymer (Ac7) had a melt flow rate (MFR) (ASTM D-1238, measurement temperature 230 ° C., load 2.16 kg) of 193 g / 10 minutes, and D _insol of 93.60 wt%. D _sol is 6.40% by weight, [η _sol ] is 1.67 dl / g, the weight of the structural unit derived from ethylene in D _sol is 28.3% by weight, and [η _insol ] is 0.76 dl / g. Met.

[Production of Propylene Polymer (Ac8)]
The polymerization was carried out in the same manner as in the production of the propylene polymer (A-4) except that the polymerization method was changed as follows.

(1) Main polymerization Into a vessel polymerization vessel with an internal volume of 1000 L, 140 kg / hour of propylene, 0.7 g / hour of the above prepolymerization catalyst as a transition metal catalyst component, 20.9 ml / hour of triethylaluminum, dicyclopentyldimethoxysilane 1.4 mL / hour was continuously supplied, and hydrogen was supplied so that the hydrogen concentration in the gas phase was 5.3 mol%. Polymerization was carried out at a polymerization temperature of 72 ° C. and a pressure of 3.4 MPa / G.

The obtained slurry was sent to a vessel polymerization vessel equipped with a stirrer having an internal volume of 500 L and further polymerized. To the polymerization vessel, propylene was supplied at 30 kg / hour, and hydrogen was supplied so that the hydrogen concentration in the gas phase portion was 3.6 mol%. Polymerization was performed at a polymerization temperature of 71.5 ° C. and a pressure of 3.3 MPa / G.

The obtained slurry was sent to a vessel polymerization vessel equipped with a stirrer having an internal volume of 500 L and further polymerized. To the polymerization vessel, propylene was supplied at 20 kg / hour, and hydrogen was supplied so that the hydrogen concentration in the gas phase was 2.6 mol%. Polymerization was performed at a polymerization temperature of 71 ° C. and a pressure of 3.2 MPa / G.

The obtained slurry was sent to a vessel polymerization vessel equipped with a stirrer having an internal volume of 500 L and further polymerized. The polymerization vessel was charged with ethylene such that propylene was 15 kg / hour, hydrogen was 2.6 mol% in the gas phase, the polymerization temperature was 58 ° C., and the pressure was 3.1 MPa / G. Diethylene glycol ethyl acetate was added in a ratio of 68 moles per Ti component in the transition metal catalyst component.

The resulting propylene polymer (Ac8) has a melt flow rate (MFR) (ASTM D-1238, measurement temperature 230 ° C., load 2.16 kg) of 31 g / 10 minutes, and D _insol is 88.20 wt%. D _sol is 11.80% by weight, [η _sol ] is 2.23 dl / g, the weight of the structural unit derived from ethylene in D _sol is 30.0% by weight, and [η _insol ] is 1.17 dl / g. Met.

[Production of ethylene / α-olefin copolymer (B-1)]
(Preparation of catalyst)
Into a 300 liter reactor sufficiently purged with nitrogen, 10.0 kg of silica dried at 600 ° C. for 10 hours and 154 liter of toluene were charged, suspended, and cooled to 0 ° C. Thereafter, 23.4 liters of a toluene solution of methylaminoxan (Al = 3.02 mol / liter) was added dropwise to the suspension over 1 hour. At this time, the temperature in the system was kept in the range of 0 to 5 ° C. Subsequently, the mixture was reacted at 0 ° C. for 30 minutes, then heated to 95 ° C. over 1.5 hours and reacted at that temperature for 4 hours. Thereafter, the temperature was lowered to 60 ° C., and the supernatant was removed by a decantation method. The solid component thus obtained was washed twice with toluene and then resuspended in 100 liters of toluene to make a total volume of 160 liters.

To the suspension thus obtained, 20.0 liters of a toluene solution of bis (1,3-n-butylmethylcyclopentadienyl) zirconium dichloride (Zr = 25.6 mmol / liter) was added at 35 ° C. The solution was added dropwise over 30 minutes and further reacted at 35 ° C. for 2 hours. Thereafter, the supernatant was removed and washed twice with hexane to obtain a solid catalyst component (1) containing 3.2 mg of zirconium per 1 g of the solid catalyst component.

(Preparation of prepolymerization catalyst)
A 350 liter reactor sufficiently purged with nitrogen was charged with 7.0 kg of the solid catalyst component (1) prepared above and hexane to make the total volume 285 liters. After cooling the system to 10 ° C., ethylene was blown into hexane at a flow rate of 8 Nm ³ / hr for 5 minutes. During this time, the temperature in the system was maintained at 10 to 15 ° C. Thereafter, the ethylene supply was stopped, and 2.4 mol of diisobutylaluminum hydride (DIBALH) and 1.2 kg of 1-hexene were charged. After the inside of the system was closed, ethylene supply was started again at a flow rate of 8 Nm ³ / hr. After 15 minutes, the ethylene flow rate was lowered to 2 Nm ³ / hr, and the pressure in the system was adjusted to 0.08 MPaG. During this time, the temperature in the system rose to 35 ° C. Thereafter, ethylene was supplied at a flow rate of 4 Nm ³ / hr for 3.5 hours while adjusting the temperature in the system to 32 to 35 ° C. During this time, the pressure in the system was maintained at 0.07 to 0.08 MPaG. Next, after the inside of the system was replaced with nitrogen, the supernatant was removed and washed twice with hexane. Thus, a prepolymerized catalyst (2) in which 3 g of polymer was prepolymerized per 1 g of the solid catalyst component was obtained.

(polymerization)
Using a continuous fluidized bed gas phase polymerization apparatus, ethylene and 1-hexene were copolymerized at a total pressure of 2.0 MPaG, a polymerization temperature of 80 ° C., and a gas linear velocity of 0.7 m / sec.

Polymerization was started while continuously supplying 4.1 g / hr of the prepolymerized catalyst (2) prepared above and TIBA at a rate of 5 mmol / hr. In order to maintain a constant gas composition during the polymerization, ethylene, 1-hexene, hydrogen and nitrogen were continuously supplied (gas composition; 1-hexene / ethylene = 0.03, hydrogen / ethylene = 4.2 × 10 ^-4 , ethylene concentration = 71%). The yield of the obtained ethylene / 1-hexene copolymer was 6.0 kg / hr, the density was 913 kg / m ³ , and the MFR was 3.8 g / 10 min.

The obtained ethylene / 1-hexene copolymer is also referred to as an ethylene / α-olefin copolymer (B-1).

[Production of ethylene / α-olefin copolymer (B-2)]
In the production (polymerization) of the ethylene / α-olefin copolymer (B-1), the gas composition was 1-hexene / ethylene = 0.02, hydrogen / ethylene = 4.6 × 10 ⁻⁴ , and ethylene concentration 70%. An ethylene / 1-hexene copolymer was obtained in the same manner as in the production of the ethylene / α-olefin copolymer (B-1) except that the ethylene / α-olefin copolymer (B-1) was produced. The yield of the obtained ethylene / 1-hexene copolymer was 5.8 kg / hr, the density was 924 kg / m ³ , and the MFR (ASTM D-1238, measurement temperature 190 ° C., load 2.16 kg) was 3. 0.8 g / 10 min.

The obtained ethylene / 1-hexene copolymer is also referred to as an ethylene / α-olefin copolymer (B-2).

[Production of ethylene / α-olefin copolymer (B-3)]
Using a continuous fluidized bed gas phase polymerization apparatus, ethylene and 1-hexene were copolymerized at a total pressure of 2.0 MPaG, a polymerization temperature of 70 ° C., and a gas linear velocity of 0.7 m / sec.

Polymerization was started while continuously supplying 4.1 g / hr of the prepolymerized catalyst (2) prepared above and TIBA at a rate of 5 mmol / hr. In order to maintain a constant gas composition during the polymerization, ethylene, 1-hexene, hydrogen and nitrogen were continuously supplied (gas composition: 1-hexene / ethylene = 0.033, hydrogen / ethylene = 4.4 × 10 ^-4 , ethylene concentration = 49.7%). The yield of the obtained ethylene / 1-hexene copolymer was 6.0 kg / hr, the density was 903 kg / m ³ , and the MFR (ASTM D-1238, measurement temperature 190 ° C., load 2.16 kg) was 3. 0.8 g / 10 min.

The obtained ethylene / 1-hexene copolymer is also referred to as an ethylene / α-olefin copolymer (B-3).

[Production of ethylene / α-olefin copolymer (B-4)]
In the production (polymerization) of the ethylene / α-olefin copolymer (B-1), the gas composition was 1-hexene / ethylene = 0.0205, hydrogen / ethylene = 5.45 × 10 ⁻⁴ , and ethylene concentration 56. An ethylene / 1-hexene copolymer was obtained in the same manner as in the production of the ethylene / α-olefin copolymer (B-1) except that the content was changed to 4%. The yield of the obtained ethylene / 1-hexene copolymer was 5.8 kg / hr, the density was 918 kg / m ³ , and the MFR (ASTM D-1238, measurement temperature 190 ° C., load 2.16 kg) was 3. 0.8 g / 10 min.

The obtained ethylene / 1-hexene copolymer is also referred to as an ethylene / α-olefin copolymer (B-4).

[Example 1]
75 parts by weight of propylene polymer (A-1), 25 parts by weight of ethylene / α-olefin copolymer (B-1), and 0.30 part by weight of Millard NX8000 (Milken) as a nucleating agent , And 0.10 parts by weight of a phosphorus-based antioxidant [tris (2,4-di-t-butylphenyl) phosphite] as an additive, 0.09 parts by weight of calcium stearate as a neutralizer, and Elca as a lubricant 0.07 part by weight of acid amide was stirred and mixed with a Henschel mixer, and the mixture was melt-kneaded under the following conditions using a twin screw extruder (NR-36) manufactured by Nakatani Machinery Co., Ltd. to obtain a strand.

(Twin screw extruder conditions)
Model: NR-36
Screw rotation speed 250rpm
Resin temperature 200 ℃
The obtained strand was cooled with water and then cut with a pelletizer to obtain a propylene-based resin composition pellet. Using these pellets, the melt flow rate (MFR) (ASTM D-1238, measurement temperature 230 ° C., load 2.16 kg) of the propylene-based resin composition was measured by the method described below. The melt flow rate (MFR) (ASTM D-1238, measurement temperature 230 ° C., load 2.16 kg) of the propylene-based resin composition obtained in Example 1 was 57 g / 10 min. The results are shown in Table 1.

Next, a test for tensile elastic modulus was performed using the pellets using an electric injection molding machine (NEX110-12E manufactured by Nissei Plastic Industry Co., Ltd.) with a clamping force of 110 tons under conditions of a cylinder temperature of 200 ° C. and a mold temperature of 40 ° C. A piece ISO test piece type (type A type) was injection molded to obtain a test piece for measuring the tensile modulus.

From this pellet, using an electric injection molding machine (FANUC Autoshot T series model 100D) with a clamping force of 100 tons, a cylinder temperature of 200 ° C. and a mold temperature of 40 ° C., a length of 129 mm, a width of 119 mm, A test piece having a thickness of 1 mm was injection molded to obtain a square plate test piece for haze measurement.

From this pellet, using an electric injection molding machine (FANUC Autoshot T series model 100D) with a clamping force of 100 tons, a cylinder temperature of 200 ° C. and a mold temperature of 40 ° C., a length of 129 mm, a width of 119 mm, A square plate test piece for measuring a high-speed impact test having a thickness of 2 mm was prepared.

Using these test pieces, tensile elastic modulus, haze, and high-speed impact test (hereinafter referred to as HRIT) were measured. These results are shown in Table 1.

Moreover, the molded object (for TEM observation) was obtained using the pellet of the said propylene-type resin composition. Specifically, using an electric injection molding machine having a clamping force of 100 tons (FANUC Auto-shot T series model 100D), a cylinder temperature of 200 ° C., a mold temperature of 40 ° C., an injection primary pressure of 1700 kg / cm ² , Under the conditions of an injection speed of 30 mm / sec, a primary pressure holding pressure of 350 kg / cm ² , a primary pressure holding time of 4 sec, and a holding pressure speed of 4 mm / sec, the propylene-based resin composition pellets were injection-molded, and the length was 129 mm, A molded body (for TEM observation) having a width of 119 mm and a thickness of 1 mm was obtained.

[Example 2]
The same procedure as in Example 1 was conducted except that the propylene polymer (A-1) was changed to the propylene polymer (A-2). The melt flow rate (MFR) (ASTM D-1238, measurement temperature 230 ° C., load 2.16 kg) of the propylene-based resin composition obtained in Example 2 was 63 g / 10 min. The results are shown in Table 1.

Example 3
80 parts by weight of propylene polymer (A-3), 20 parts by weight of ethylene / α-olefin copolymer (B-1), and 0.30 parts by weight of Millard NX8000 (Milken) as a nucleating agent , And 0.10 parts by weight of a phosphorus-based antioxidant [tris (2,4-di-t-butylphenyl) phosphite] as an additive, 0.09 parts by weight of calcium stearate as a neutralizer, and Elca as a lubricant 0.07 part by weight of acid amide, and further 2,5-dimethyl-2,5-di (t-butylperoxy) hexane as an organic peroxide (trade name: Perhexa 25B, manufactured by NOF Corporation) 0.012 A part by weight was stirred and mixed with a Henschel mixer, and the mixture was melt-kneaded under the following conditions with a twin-screw extruder (NR-36) manufactured by Nakatani Machinery Co., Ltd. to obtain a strand.

(Twin screw extruder conditions)
Model: NR-36
Screw rotation speed 250rpm
Resin temperature 200 ℃
The obtained strand was cooled with water and then cut with a pelletizer to obtain a propylene-based resin composition pellet. Using these pellets, the melt flow rate (MFR) (ASTM D-1238, measurement temperature 230 ° C., load 2.16 kg) of the propylene-based resin composition was measured by the method described below. The melt flow rate (MFR) (ASTM D-1238, measurement temperature 230 ° C., load 2.16 kg) of the propylene-based resin composition obtained in Example 3 was 47 g / 10 minutes. The results are shown in Table 1.

Using these test pieces, tensile elastic modulus, haze, and high-speed impact test (hereinafter referred to as HRIT) were measured. The results are shown in Table 1.

Example 4
The same procedure as in Example 3 was carried out except that 77 parts by weight of the propylene polymer (A-3) and 23 parts by weight of the ethylene / α-olefin copolymer (B-1) were used. The melt flow rate (MFR) (ASTM D-1238, measuring temperature 230 ° C., load 2.16 kg) of the propylene-based resin composition obtained in Example 4 was 52 g / 10 min. The results are shown in Table 1.

Example 5
The same procedure as in Example 3 was carried out except that 75 parts by weight of the propylene polymer (A-3) and 25 parts by weight of the ethylene / α-olefin copolymer (B-1) were used. The melt flow rate (MFR) (ASTM D-1238, measurement temperature 230 ° C., load 2.16 kg) of the propylene-based resin composition obtained in Example 5 was 56 g / 10 min. The results are shown in Table 1.

Moreover, the molded object (for TEM observation) was obtained using the pellet of the propylene-type resin composition obtained by the present Example. Specifically, using an electric injection molding machine having a clamping force of 100 tons (FANUC Auto-shot T series model 100D), a cylinder temperature of 200 ° C., a mold temperature of 40 ° C., an injection primary pressure of 1700 kg / cm ² , Under the conditions of an injection speed of 30 mm / sec, a primary pressure holding pressure of 350 kg / cm ² , a primary pressure holding time of 4 sec, and a holding pressure speed of 4 mm / sec, the propylene-based resin composition pellets were injection-molded, and the length was 129 mm, A molded body (for TEM observation) having a width of 119 mm and a thickness of 1 mm was obtained.

Using the propylene-based resin composition pellets obtained in this example, a container was formed by the following method.

Using an electric injection molding machine (FANUC Autoshot T series model 100D) with a clamping force of 100 tons, cylinder temperature 250 ° C., mold temperature 20 ° C., injection primary pressure 1700 Kg / cm ² , injection speed 70 mm / sec. The propylene-based resin composition pellets were maintained under the conditions of primary pressure, secondary pressure 900, 830 kg / cm ² , primary pressure time, secondary pressure time 3 seconds, 3 seconds, and pressure rate 4 mm / sec. A container having a height of 78.15 mm, a diameter of 90.21 mm, and a side wall thickness of 0.5 mm was injection molded.

The side surface of the obtained container was cut out, and the haze value measured using NDH2000 manufactured by Nippon Denshoku Industries Co., Ltd. according to the haze test method defined in JIS K 7136 was about 8%. Moreover, the compression strength which carried out the compression test by 205 type | mold by Intesco, test speed 300mm / min, and test temperature 23 degreeC using a container is 556N, transparency is favorable, and mold release At times, important rigidity was also given.

Example 6
The same procedure as in Example 3 was carried out except that 70 parts by weight of the propylene polymer (A-3) and 30 parts by weight of the ethylene / α-olefin copolymer (B-1) were used. The melt flow rate (MFR) (ASTM D-1238, measurement temperature 230 ° C., load 2.16 kg) of the propylene-based resin composition obtained in Example 6 was 44 g / 10 minutes. The results are shown in Table 1.

Example 7
The same as Example 5 except that Milled NX8000 (manufactured by Milliken) was changed to Adeka Stub NA-21 (manufactured by Adeka) as the nucleating agent, and 0.25 parts by weight of Adeka Stub NA-21 was used as the nucleating agent. went. The melt flow rate (MFR) (ASTM D-1238, measurement temperature 230 ° C., load 2.16 kg) of the propylene-based resin composition obtained in Example 7 was 48 g / 10 minutes. The results are shown in Table 1.

[Comparative Example 1]
The same procedure as in Example 1 was conducted except that the propylene polymer (A-1) was changed to a propylene polymer (A-c1). The melt flow rate (MFR) (ASTM D-1238, measurement temperature 230 ° C., load 2.16 kg) of the propylene-based resin composition obtained in this Comparative Example 1 was 48 g / 10 min. The results are shown in Table 2. In this comparative example, since the propylene polymer (A-c1) is used, the D _insol of the propylene polymer of the requirement (A1) related to the claim of the present application is less than the claimed range and the D _sol is larger than the claimed range. . For this reason, rigidity (tensile modulus) was inferior.

[Comparative Example 2]
The same procedure as in Example 1 was conducted except that the propylene polymer (A-1) was changed to a propylene polymer (Ac2). The melt flow rate (MFR) (ASTM D-1238, measurement temperature 230 ° C., load 2.16 kg) of the propylene-based resin composition obtained in Comparative Example 2 was 49 g / 10 minutes. The results are shown in Table 2. In this comparative example, since the propylene polymer (Ac2) is used, the D _insol of the propylene polymer of the requirement (A1) related to the claim of the present application is less than the claimed range and the D _sol is larger than the claimed range. . For this reason, rigidity (tensile modulus) and transparency (haze) were inferior.

[Comparative Example 3]
The same procedure as in Example 1 was conducted except that the propylene polymer (A-1) was changed to a propylene polymer (Ac3). The melt flow rate (MFR) (ASTM D-1238, measurement temperature 230 ° C., load 2.16 kg) of the propylene-based resin composition obtained in Comparative Example 3 was 54 g / 10 min. The results are shown in Table 2. In this comparative example, since the propylene polymer (Ac3) is used, the D _insol of the propylene polymer of the requirement (A1) relating to the claim of the present application is less than the claimed range and the D _sol is larger than the claimed range. . For this reason, rigidity (tensile modulus) and transparency (haze) were inferior.

[Comparative Example 4]
The same procedure as in Example 1 was conducted except that the propylene polymer (A-1) was changed to a propylene polymer (Ac4). The melt flow rate (MFR) (ASTM D-1238, measurement temperature 230 ° C., load 2.16 kg) of the propylene-based resin composition obtained in this Comparative Example 4 was 61 g / 10 min. The results are shown in Table 2. In this comparative example, since the propylene polymer (Ac4) is used, the D _insol of the propylene polymer of the requirement (A1) related to the claim of the present application is less than the claimed range and the D _sol is larger than the claimed range. . For this reason, rigidity (tensile modulus) and transparency (haze) were inferior.

[Comparative Example 5]
The same procedure as in Example 1 was conducted except that the propylene polymer (A-1) was changed to a propylene polymer (Ac5). The melt flow rate (MFR) (ASTM D-1238, measurement temperature 230 ° C., load 2.16 kg) of the propylene-based resin composition obtained in this Comparative Example 5 was 43 g / 10 min. The results are shown in Table 2. In this comparative example, since the propylene polymer (Ac5) is used, the weight of the constituent unit derived from ethylene in the D _sol of the propylene polymer of the requirement (A3) relating to the claim of the present application is claimed. Less than range. For this reason, the low temperature impact resistance (HRIT (ductility)) was inferior.

[Comparative Example 6]
The same procedure as in Example 3 was carried out except that 90 parts by weight of the propylene polymer (Ac6), 10 parts by weight of the ethylene / α-olefin copolymer (B-1) were used, and no nucleating agent was used. . The melt flow rate (MFR) (ASTM D-1238, measurement temperature 230 ° C., load 2.16 kg) of the propylene-based resin composition obtained in this Comparative Example 6 was 48 g / 10 min. The results are shown in Table 2. In this comparative example, 90 parts by weight of the propylene polymer (Ac6) and 10 parts by weight of the ethylene / α-olefin copolymer (B-1) are used. For this reason, the blending ratio of the propylene polymer (A) is larger than the blending ratio of the propylene polymer (A) and the ethylene / α-olefin copolymer (B) according to claim 1, and the ethylene / α- There are few compounding ratios of an olefin copolymer (B). Also, no nucleating agent is blended. For this reason, it was inferior to transparency (haze).

[Comparative Example 7]
The same procedure as in Comparative Example 6 was carried out except that 70 parts by weight of the propylene polymer (Ac6) and 30 parts by weight of the ethylene / α-olefin copolymer (B-1) were used. The melt flow rate (MFR) (ASTM D-1238, measurement temperature 230 ° C., load 2.16 kg) of the propylene-based resin composition obtained in this Comparative Example 7 was 35 g / 10 minutes. The results are shown in Table 2. In this comparative example, no nucleating agent is blended. For this reason, it was inferior to rigidity (tensile modulus) and transparency (haze).

[Comparative Example 8]
Comparative Example 7 was carried out except that the ethylene / α-olefin copolymer (B-1) was changed to the ethylene / α-olefin copolymer (B-2). The melt flow rate (MFR) (ASTM D-1238, measurement temperature 230 ° C., load 2.16 kg) of the propylene-based resin composition obtained in this Comparative Example 8 was 36 g / 10 min. The results are shown in Table 2. In this comparative example, since the ethylene / α-olefin copolymer (B-2) is used, the density of the ethylene / α-olefin copolymer of the requirement (B2) relating to the claims of the present application is higher than the claims of the present application. . Also, no nucleating agent is blended. For this reason, rigidity (tensile modulus) and transparency (haze) were inferior.

[Comparative Example 9]
The same procedure as in Comparative Example 8 was performed, except that 0.30 double parts of the nucleating agent Millard NX8000 (Milken) were used. The melt flow rate (MFR) (ASTM D-1238, measuring temperature 230 ° C., load 2.16 kg) of the propylene-based resin composition obtained in Comparative Example 9 was 37 g / 10 min. The results are shown in Table 2. The density of the ethylene / α-olefin copolymer of the requirement (B2) related to the claims of the present application is higher than the claims of the present application. For this reason, transparency (haze) was inferior.

[Comparative Example 10]
An ethylene / α-olefin copolymer (B-1) is produced with a so-called Ziegler-Natta catalyst that is not a single-site catalyst, manufactured by Prime Polymer Co., Ltd., Ultrazex 15150J (MFR 15 g / 10 min (ASTM D-1238, measurement) The process was performed in the same manner as in Example 5 except that the temperature was changed to 190 ° C. and the load was 2.16 kg): density 915 kg / m ³ ). The melt flow rate (MFR) (ASTM D-1238, measurement temperature 230 ° C., load 2.16 kg) of the propylene-based resin composition obtained in Comparative Example 9 was 65 g / 10 min. The results are shown in Table 2. In this comparative example, the ultra low temperature impact resistance (HRIT (ductility)) is used because of the use of Ultex Zex 15150J manufactured by Prime Polymer Co., Ltd. polymerized with a so-called Ziegler-Natta catalyst that is not a single-site catalyst for the ethylene / α-olefin copolymer. Was inferior.

[Comparative Example 11]
This was carried out in the same manner as Comparative Example 10 except that Millard NX8000 (manufactured by Milliken) was changed to Gelol MD (manufactured by Shin Nippon Chemical Co., Ltd.) as the nucleating agent. The melt flow rate (MFR) (ASTM D-1238, measurement temperature 230 ° C., load 2.16 kg) of the propylene-based resin composition obtained in Comparative Example 11 was 65 g / 10 min. The results are shown in Table 2. In this comparative example, since the Ultzex 15150J manufactured by Prime Polymer Co., Ltd. polymerized with a so-called Ziegler-Natta catalyst that is not a single site catalyst is used for the ethylene / α-olefin copolymer, the requirement (B1) related to the claims of the present application is satisfied. Absent. For this reason, the low temperature impact resistance (HRIT (ductility)) was inferior. Moreover, since the Nippon Nippon Chemical Co., Ltd. gel-all MD was used as a nucleating agent, the odor was strong.

Example 8
The same procedure as in Example 1 was conducted, except that 73.5 parts by weight of the propylene polymer (A-4) and 26.5 parts by weight of the ethylene / α-olefin copolymer (B-1) were used. The melt flow rate (MFR) (ASTM D-1238, measurement temperature 230 ° C., load 2.16 kg) of the propylene-based resin composition obtained in Example 8 was 65 g / 10 min. The results are shown in Table 3.

Example 9
The same procedure as in Example 1 was carried out except that 75 parts by weight of the propylene polymer (A-5) and 25 parts by weight of the ethylene / α-olefin copolymer (B-1) were used. The melt flow rate (MFR) (ASTM D-1238, measurement temperature 230 ° C., load 2.16 kg) of the propylene-based resin composition obtained in Example 9 was 62 g / 10 minutes. The results are shown in Table 3.

Example 10
The same procedure as in Example 1 was carried out except that 73.5 parts by weight of the propylene polymer (A-6) and 26.5 parts by weight of the ethylene / α-olefin copolymer (B-1) were used. The melt flow rate (MFR) (ASTM D-1238, measurement temperature 230 ° C., load 2.16 kg) of the propylene-based resin composition obtained in Example 10 was 55 g / 10 min. The results are shown in Table 3.

Example 11
The same procedure as in Example 1 was carried out except that 75 parts by weight of the propylene polymer (A-3) and 25 parts by weight of the ethylene / α-olefin copolymer (B-3) were used. The melt flow rate (MFR) (ASTM D-1238, measurement temperature 230 ° C., load 2.16 kg) of the propylene-based resin composition obtained in Example 11 was 52 g / 10 minutes. The results are shown in Table 3.

Example 12
The same procedure as in Example 11 was performed, except that the ethylene / α-olefin copolymer (B-4) was used. The melt flow rate (MFR) (ASTM D-1238, measurement temperature 230 ° C., load 2.16 kg) of the propylene-based resin composition obtained in Example 12 was 53 g / 10 minutes. The results are shown in Table 3.

Example 13
The same procedure as in Example 1 was conducted except that 73.5 parts by weight of the propylene polymer (A-7) and 26.5 parts by weight of the ethylene / α-olefin copolymer (B-1) were used. The melt flow rate (MFR) (ASTM D-1238, measuring temperature 230 ° C., load 2.16 kg) of the propylene-based resin composition obtained in Example 13 was 58 g / 10 min. The results are shown in Table 3.

[Comparative Example 12]
The same procedure as in Example 1 was conducted except that the propylene polymer (A-1) was changed to a propylene polymer (Ac7). The melt flow rate (MFR) (ASTM D-1238, measurement temperature 230 ° C., load 2.16 kg) of the propylene-based resin composition obtained in this Comparative Example 12 was 90 g / 10 min. The results are shown in Table 4. In this comparative example, since the propylene polymer (Ac7) is used, the melt flow rate of the propylene polymer having the requirement (A1) relating to the claims of the present application is higher than the claims of the present application. For this reason, transparency (haze) was inferior.

[Comparative Example 13]
The same procedure as in Example 1 was carried out except that 90 parts by weight of the propylene polymer (A-3) and 10 parts by weight of the ethylene / α-olefin copolymer (B-1) were used. The melt flow rate (MFR) (ASTM D-1238, measuring temperature 230 ° C., load 2.16 kg) of the propylene-based resin composition obtained in Comparative Example 13 was 68 g / 10 min. The results are shown in Table 4. In this comparative example, since the weight part range of the ethylene / α-olefin copolymer of the requirement (B) related to the claims of the present application is less than the claims of the present application, low temperature impact resistance (HRIT (ductility)) and transparency (haze) ) Was inferior.

Moreover, the molded object (for TEM observation) was obtained using the pellet of the propylene-type resin composition obtained by this comparative example. Specifically, using an electric injection molding machine having a clamping force of 100 tons (FANUC Auto-shot T series model 100D), a cylinder temperature of 200 ° C., a mold temperature of 40 ° C., an injection primary pressure of 1700 kg / cm ² , Under the conditions of an injection speed of 30 mm / sec, a primary pressure holding pressure of 350 kg / cm ² , a primary pressure holding time of 4 sec, and a holding pressure speed of 4 mm / sec, the propylene-based resin composition pellets were injection-molded, and the length was 129 mm, A molded body (for TEM observation) having a width of 119 mm and a thickness of 1 mm was obtained.

[Comparative Example 14]
Comparative Example 13 was carried out except that 50 parts by weight of the propylene polymer (A-3) and 50 parts by weight of the ethylene / α-olefin copolymer (B-1) were used. The melt flow rate (MFR) (ASTM D-1238, measurement temperature 230 ° C., load 2.16 kg) of the propylene-based resin composition obtained in Comparative Example 14 was 28 g / 10 min. The results are shown in Table 4. In this comparative example, the propylene-based polymer parts by weight of requirement (A) and the parts by weight of ethylene / α-olefin copolymer of requirement (B) deviate from the claims of this application, so (Tensile modulus) was inferior.

[Comparative Example 15]
70 parts by weight of propylene-based polymer (A-c8), ethylene / α-olefin copolymer (B-5), Tosoh Petrocene 342 (MFR 8 g / 10 min (ASTM D-1238, measurement temperature 190 ° C.) The same procedure as in Example 1 was performed except that 30 parts by weight of a load of 2.16 kg): density 919 kg / m ³ ) was used. The melt flow rate (MFR) (ASTM D-1238, measuring temperature 230 ° C., load 2.16 kg) of the propylene-based resin composition obtained in Comparative Example 15 was 18 g / 10 minutes. The results are shown in Table 4. In this comparative example, since the propylene polymer (Ac8) is used, the D _insol of the propylene polymer of the requirement (A1) related to the claim of the present application is less than the claimed range and the D _sol is larger than the claimed range. . For this reason. For this reason, rigidity (tensile modulus) and transparency (haze) were inferior.

〔Evaluation methods〕
According to the method described below, the physical properties of the propylene polymer (A), the ethylene / α-olefin copolymer (B) or the propylene resin composition were measured. The results are shown in Tables 1 and 3 (Examples) and Tables 2 and 4 (Comparative Examples).

[D _insol and D _sol ]
The ratio of D _insol and D _sol of the propylene polymer (A) was determined by the following method.

200 ml of n-decane is added to 5 g of a sample of the propylene polymer (A), and heated and dissolved at 145 ° C. for 30 minutes to obtain a solution (1). Next, over about 2 hours, the solution is cooled to room temperature 25 ° C. and left at 25 ° C. for 30 minutes to obtain a solution (2) containing a precipitate (α). Thereafter, the precipitate (α) is filtered from the solution (2) with a filter cloth having an opening of about 15 μm, and the precipitate (α) is dried, and then the weight of the precipitate (α) is measured. The weight of the precipitate (α) divided by the sample weight (5 g) is taken as the ratio of the n-decane insoluble part (D _insol ). Further, the solution (2) obtained by filtering the precipitate (α) is put in about three times as much acetone as the solution (2), and the components dissolved in n-decane are precipitated, and the precipitate (β ) Thereafter, the precipitate (β) is filtered off with a glass filter (G2, opening of about 100 to 160 μm) and dried, and then the weight of the precipitate (β) is measured. The weight of the precipitate (β) at this time divided by the sample weight (5 g) is taken as the ratio of the n-decane soluble part (D _sol ). In the above-described Examples, no residue was observed even when the filtrate side from which the precipitate (β) was filtered was concentrated and dried.

[Intrinsic viscosity [η _sol ] measured at 135 ° C. in tetralin for D _sol ]
The intrinsic viscosity [η _sol ] measured at 135 ° C. in tetralin of the D _sol of the propylene polymer (A) was determined as follows.

[Weight of structural unit derived from ethylene in D _sol ]
Propylene Polymer (A) The weight of the structural unit derived from ethylene in the D _sol was determined by measuring and calculating as follows based on the measurement of ¹³ C-NMR.

¹³ C-NMR measurement condition measurement device: LA400 type nuclear magnetic resonance apparatus manufactured by JEOL Measurement mode: BCM (Bilevel Complete Decoupling)
Observation frequency: 100.4 MHz
Observation range: 17006.8Hz
Pulse width: C nucleus 45 ° (7.8 μsec)
Pulse repetition time: 5 seconds Sample tube: 5 mmφ
Sample tube rotation speed: 12Hz
Integration count: 20000 times Measurement temperature: 125 ° C
Solvent: 1,2,4-trichlorobenzene: 0.35 ml / heavy benzene: 0.2 ml
Sample amount: about 40mg
From the spectrum obtained by measurement, the ratio of the monomer chain distribution (triad (triad) distribution) is determined according to the following document (1), and the structural unit derived from ethylene in D _{sol of the} propylene polymer The molar fraction (mol%) (hereinafter referred to as E (mol%)) and the molar fraction (mol%) of structural units derived from propylene (hereinafter referred to as P (mol%)) were calculated. Based on the obtained E (mol%) and P (mol%), the weight (wt%) of the structural unit derived from ethylene in D _{sol of the} propylene polymer is converted into wt% according to the following (formula 1) (hereinafter referred to as E (denoted as (wt%)).

Reference (1): Kakugo, M .; Naito, Y .; Mizunuma, K .; Miyatake, T., Carbon-13 NMR determination of monomer sequence distribution in ethylene-propylene copolymer prepared with delta-titanium trichloride-diethylaluminum chloride. Macromolecules 1982, 15, (4), 1150-1152
E (wt%) = E (mol%) × 28 × 100 / [P (mol%) × 42 + E (mol%) × 28] (Formula 1)
[Intrinsic viscosity [η _insol ] of D _insol measured at 135 ° C. in tetralin]
The propylene-based polymer of the D _insol of (A), an intrinsic viscosity measured at 135 ° C. in tetralin [eta _insol] can be determined as follows.

[Melt flow rate]
The melt flow rate of the propylene polymer (A) was measured according to ASTM D-1238 (230 ° C., 2.16 kg load).

The density of the ethylene / α-olefin copolymer (B) can be determined as follows.

A strand obtained by measuring the melt flow rate of the ethylene / α-olefin copolymer (B) at a measurement temperature of 190 ° C. under a load of 2.16 kg (ASTM D-1238) was heat-treated at 120 ° C. for 1 hour, The sample which was gradually cooled to room temperature over time was used as a sample, and the density was measured by a density gradient tube method to determine the density of the ethylene / α-olefin copolymer (B).

The melt flow rate of the ethylene / α-olefin copolymer (B) was measured according to ASTM D-1238 (measuring temperature 190 ° C., load 2.16 kg).

The melt flow rate of the propylene resin composition was measured in accordance with ASTM D-1238 (measuring temperature 230 ° C., 2.16 kg load).

[Tensile modulus]
The tensile modulus of the test piece for measuring the tensile modulus obtained in each example and comparative example was measured in accordance with the tensile modulus test method defined in ISO 527-2. The tensile measurement temperature is 23 ° C., the test speed is 1 mm / min, the test piece is a type A type described in ISO 527-2 obtained by the above injection molding, and the test machine is a Toyo Seiki Seisakusho Str. It was graph V10-C. The evaluation result of the tensile elastic modulus was used as an index of rigidity. That is, the larger the value of the tensile modulus, the better the rigidity.

[Haze]
The haze of the square plate test piece for haze measurement obtained in each comparative example was measured using NDH2000 manufactured by Nippon Denshoku Industries Co., Ltd. according to the haze test method defined in JIS K7136. The test piece obtained by the injection molding was a test piece having a length of 129 mm, a width of 119 mm, and a thickness of 1 mm. This haze evaluation result was used as an index of transparency. That is, a small value was considered excellent in transparency.

(Low temperature impact resistance)
Using the square plate test piece for high speed impact test measurement obtained in each comparative example, the high speed impact test (HRIT) was measured according to the high speed impact test method defined in ASTM (D3763-02). As the test piece, a test piece having a length of 129 mm, a width of 119 mm, and a thickness of 2 mm obtained by the above injection molding was used. For details, use a Shimadzu measuring instrument (Shimadzu servo pulsar high-speed impact tester HTM-10KN type with constant temperature) and adjust the test piece for 2 hours at -20 ° C under measurement conditions. (A hemispherical tip having a 1/2 inch diameter) was hit at the center of the square plate, and the energy absorbed by the sample until breaking or penetration was obtained. The square plate is supported by a clamp with a 3 inch diameter hole. In the table, the ductility is the total energy minus the energy from yielding, and is used as an index to see how much ductile fracture has occurred. The larger this value, the better the low-temperature impact resistance.

[Odor]
The odor of the propylene-based resin composition was obtained by putting 10 g of the composition pellets into a 100 ml Erlenmeyer flask, sealing with a cap, taking out after heating in a 100 ° C. oven for 1 hour, opening the cap immediately, and generating the odor. Was determined by sensory test as follows.

AA: No odor BB: Some odor CC: Some odor [TEM observation]
In order to observe the cross section near the surface of the molded body (for TEM observation) obtained in Examples 1 and 5 and Comparative Example 13 with a TEM observation, the test piece was further cut out and the obtained cut piece was used for the purpose of surface protection. Resin embedded. In order to give contrast during TEM observation, the resin-embedded cut piece was enclosed in a glass bottle together with RuO ₄ crystals and dyed for about 12 to 16 hours. Thereafter, an ultrathin section having a thickness of about 50 to 120 nm, which is a specimen for TEM observation at room temperature, was prepared with an ultramicrotome (manufactured by Leica). The ultrathin section (TEM observation specimen) was observed using a transmission electron microscope (TEM: H-7650 acceleration voltage of about 100 kV manufactured by Hitachi High-Technologies Corporation).

For the TEM image obtained by TEM observation, the skin layer (layer 2 to 5 μm deep from the surface of the molded body (for TEM observation)) and the core layer (molded body (TEM) (TEM specimen)) of the ultrathin slice (TEM specimen) Observation) A layer having a depth of 50 to 60 μm from the surface was observed.

According to TEM observation, in Examples 1 and 5, the width in the depth direction of the dark portion in the skin layer was 0.4 μm or less.

In Examples 1 and 5, the width in the depth direction of the dark portion of the core layer (a layer having a depth of 50 to 60 μm from the specimen surface) was 0.7 μm or less.

Claims

60 to 80 parts by weight of a propylene polymer (A) satisfying the following requirements (A1) to (A5), 20 to 40 weights of an ethylene / α-olefin copolymer (B) satisfying the following requirements (B1) to (B3) Part (provided that the total of the propylene polymer (A) and the ethylene / α-olefin copolymer (B) is 100 parts by weight) and the nucleating agent 0.1 to 0.4 parts by weight Resin composition.
(A1): The component (D insol ) insoluble in n-decane of the propylene polymer (A) is 90.5 to 97.0% by weight, and the component (D sol ) soluble in n-decane is 3 0.0 to 9.5% by weight (provided that the sum of D insol and D sol is 100% by weight)
(A2): The intrinsic viscosity [η sol ] of D sol measured at 135 ° C. in tetralin is 1.0 to 2.5 dl / g. (A3): a structural unit derived from ethylene in the D sol The weight is 25 to 35% by weight in 100% by weight of the D sol. (A4): The intrinsic viscosity [η insol ] of the D insol measured at 135 ° C. in tetralin is 0.8 to 1.1 dl / g. Yes (A5): The melt flow rate (MFR) (ASTM D-1238, measuring temperature 230 ° C., load 2.16 kg) of the propylene polymer (A) is 35 to 170 g / 10 min. (B1): ethylene The α-olefin copolymer (B) is an ethylene / α-olefin copolymer polymerized using a single site catalyst as a catalyst. (B2): The density of the ethylene / α-olefin copolymer (B) is 900-919kg / A 3 (B3): melt flow rate (MFR) of the ethylene · alpha-olefin copolymer (B) (ASTM D-1238 , measured temperature 190 ° C., load of 2.16 kg) is 0.1 ~ 50 g / 10 min Is
The propylene polymer (A) satisfies the following requirement (A2 '), and the ethylene / α-olefin copolymer (B) satisfies the following requirement (B3'). Propylene-based resin composition.
(A2 ′): D sol has an intrinsic viscosity [η sol ] measured in tetralin at 135 ° C. of 1.5 to 2.5 dl / g. (B3 ′): ethylene / α-olefin copolymer (B ) Melt flow rate (MFR) (ASTM D-1238, measuring temperature 190 ° C., load 2.16 kg) is 1 to 10 g / 10 min.
3. The propylene-based resin composition according to claim 1, wherein the melt flow rate (MFR) (ASTM D-1238, measurement temperature 230 ° C., load 2.16 kg) is 20 to 100 g / 10 minutes.
The melt flow rate (MFR) (ASTM D-1238, measurement temperature 190 ° C., load 2.16 kg) of the ethylene / α-olefin copolymer (B) is 2.0 to 5.0 g / 10 min. The propylene-based resin composition according to any one of 1 to 3.
The propylene-based resin composition according to any one of claims 1 to 4, wherein the propylene-based resin composition satisfies the following requirement (X1).
(X1): Using an injection molding machine with a clamping force of 100 tons, cylinder temperature 200 ° C., mold temperature 40 ° C., injection primary pressure 1700 Kg / cm 2 , injection speed 30 mm / sec, holding pressure primary pressure 350 kg / Under the conditions of cm 2 , pressure holding primary time 4 sec, pressure holding speed 4 mm / sec, a propylene-based resin composition pellet was injection molded to obtain a molded body having a length of 129 mm, a width of 119 mm, and a thickness of 1 mm, Obtained by cutting the molded body into smaller pieces, embedding the obtained cut pieces with resin, encapsulating the resin-embedded cut pieces with RuO 4 crystals in a glass bottle, dyeing them, and cutting them at room temperature using an ultramicrotome. In the TEM image obtained by observing the obtained ultrathin section using TEM, the depth of the dark color part of the skin layer (layer having a depth of 2 to 5 μm from the surface of the molded body) The width in the direction is 0.4 μm or less
The propylene-based resin composition according to any one of claims 1 to 5, which has a tensile elastic modulus of 1300 to 1800 MPa.
A molded body formed from the propylene-based resin composition according to any one of claims 1 to 6.
A container formed from the propylene-based resin composition according to any one of claims 1 to 6.
A food packaging container formed from the propylene-based resin composition according to any one of claims 1 to 6.
A container obtained by injection molding or injection stretch blow molding the propylene-based resin composition according to any one of claims 1 to 6.
A food packaging container obtained by injection molding or injection stretch blow molding the propylene-based resin composition according to any one of claims 1 to 6.