Title of the invention: Propylene block copolymer, its production method, and solid titanium catalyst component for olefin polymerization. Technical field [0001] 　The present invention relates to a propylene-based block copolymer, a method for producing the same, and a solid titanium catalyst component for olefin polymerization. Background technology [0002] 　Propylene-based resins are used in various fields such as daily necessities, kitchen utensils, packaging films, home appliances, mechanical parts, electrical parts, and automobile parts. [0003] 　Further, depending on the application, a rubber component, an amorphous or low crystalline ethylene / propylene copolymer (EPR), an amorphous ethylene / α-olefin copolymer, or the like is directly polymerized on the propylene polymer. A propylene-based block copolymer having improved impact resistance and the like may be used. However, it is known that propylene-based block copolymers tend to adhere to the inner wall of the polymerizer and to adhere to each other during storage. [0004] 　Therefore, for example, Patent Document 1 reports a method of increasing the fluidity of a propylene-based block copolymer by feeding a flow modifier when polymerizing the rubber component on a propylene-based polymer. ing. [0005] 　Further, Patent Document 2 suggests a method of introducing a large amount of rubber component by controlling the shape of the solid titanium catalyst component for producing a propylene-based block polymer. Prior art literature Patent documents [0006] Patent Document 1: Japanese Patent Application Laid-Open No. 2017-132870 Patent Document 2: Japanese Patent Application Laid-Open No. 2002-356507 Outline of the invention Problems to be solved by the invention [0007] 　However, even if the propylene-based block copolymer is produced by the method described in Patent Document 1, it has not been possible to sufficiently suppress the adhesion to the inner wall of the polymerizer. [0008] 　Further, Patent Document 2 discloses that a propylene-based block copolymer having a high rubber content but excellent fluidity can be obtained, but the propylene-based high rubber content disclosed in Examples is disclosed. As a result of calculation from experimental data, it was suggested that the rubber component of the block copolymer is a rubber component having a relatively low ethylene unit content (relatively hard and difficult to flow). [0009] 　The present invention has been made in view of the above-mentioned problems of the prior art, and a propylene-based block copolymer capable of sufficiently suppressing adhesion to the inner wall of the polymer, a method for producing the propylene-based block copolymer, and the like. An object of the present invention is to provide a solid titanium catalyst component for producing the propylene-based block copolymer. Preferably, the propylene-based block copolymer is a propylene-based block copolymer capable of sufficiently controlling adhesion to the inner wall of the polymer even if it is a rubber component having a relatively high ethylene unit content and easily flowing. Is. Means to solve problems [0010] 　[1] 100 g of the copolymer at room temperature 　was held at 80 ° C. for 24 hours under a load of 10 kg and the number of seconds of dropping X (seconds) when dropped using a stainless steel funnel having an inner diameter of 11.9 mm . The evaluation value of fluidity calculated by the following formula from the number of seconds Y (seconds) of dropping when the latter 100 g of the copolymer was dropped using a funnel having an inner diameter of 11.9 mm was 40% or less. in it, 　　the fluidity of the evaluation value (%) = {(Y / X) -1} × 100 　propylene block copolymer. 　[2] The content of Dsol is 30% by mass or more based on 100% by mass of the total of the component soluble in n-decane at 23 ° C. (Dsol) and the component sparingly soluble in n-decane at 23 ° C. (Dinsol). The propylene-based block copolymer according to [1], which is 40% by mass or less. 　[3] The propylene-based block copolymer according to [2], wherein the ethylene unit content in the Dsol is 36.0 mol% or more. 　[4] A solid compound (S) containing a magnesium compound (II-0) having a first pore distribution index of 2 or more represented by the formula (I) and a 　　first pore distribution index = x / y. (I) 　(In formula (I), x is the cumulative pore volume with a pore diameter of 0.001 to 0.1 μm measured with a mercury porosimeter, and y is the cumulative volume of 0.1 to 1.0 μm measured with a mercury porosimeter. Pore ​​volume.) 　A titanium compound represented by the formula (IV) and 　　Ti (OR) g X 4-g.　　　　　　(IV) 　(In formula (IV), R is a hydrocarbon group, X is a halogen atom, and g is an integer satisfying 0≤g≤4.) 　Contact 　with an electron donor . 　The first polymerization step of producing a crystalline propylene-based (co) polymer by polymerizing propylene and optionally another α-olefin in the presence of the solid titanium catalyst component (i) produced in the 　above, and the above-mentioned first. A crystalline propylene-based (co) polymer produced in one polymerization step, a rubber component, an amorphous or low crystalline ethylene / propylene copolymer (EPR), and an amorphous ethylene / α-olefin copolymer. A 　method for producing 　a propylene-based block copolymer , which comprises a second polymerization step of polymerizing a raw material of one polymer selected from the group consisting of . 　[5] The method for producing a propylene-based block copolymer according to [4], wherein both the first polymerization step and the second polymerization step are steps in which polymerization is carried out in the presence of hydrogen. 　[6] When the magnesium compound (II-0) is a solid complex compound defined by the following formula (II) and a is 0 in the formula (II), g is 4 in the formula (IV). No, the method for producing a propylene-based block copolymer according to [4] or [5]. 　MgX a Rs b · (RtOH) m　　 ... (II) 　(In formula (II), X is a halogen atom, Rs is a heteroatom-containing hydrocarbon group, Rt is a carbon hydrogen group that may contain a heteroatom, and m is 2.0 ≦ m ≦ 3.3. It is a real number that satisfies, a is an integer that satisfies 0 ≦ a ≦ 2, b is an integer that satisfies 0 ≦ b ≦ 2, and the sum of a and b is 2.) 　[7] Equation (I) A solid compound (S) containing a magnesium compound (II-0) having a first pore distribution index of 2 or more, and a 　　first pore distribution index = x / y ... (I) 　(formula ). In (I), x is the cumulative pore volume with a pore diameter of 0.001 to 0.1 μm measured with a mercury porosimeter, and y is the cumulative pore volume with a pore diameter of 0.1 to 1.0 μm measured with a mercury porosimeter.) 　The titanium compound represented by the formula (IV) and 　　Ti (OR) g X 4-g　　　　　　　　... (IV) 　(In the formula (IV), R is a hydrocarbon group, X is a halogen atom, and g. Is an integer satisfying 0 ≦ g ≦ 4.) 　A solid titanium catalyst component produced by contacting an 　electron donor with an electron donor . Effect of the invention [0011] 　According to the present invention, there is provided a propylene-based block copolymer capable of sufficiently suppressing adhesion to the inner wall of the polymer, and a method for producing the propylene-based block copolymer. A brief description of the drawing [0012] FIG. 1 is a schematic diagram showing a funnel used to obtain an evaluation value of fluidity for the propylene-based block copolymer of the present invention. Mode for carrying out the invention [0013] 　The propylene-based block copolymer according to the present invention has a drop number of seconds X (seconds) when a 100 g copolymer at room temperature is dropped using a stainless steel funnel having an inner diameter of 11.9 mm, and 　a load of 10 kg. Below, the flow calculated by the following formula from the number of seconds Y (seconds) of dropping when 100 g of the copolymer after holding at 80 ° C. for 24 hours is dropped using a funnel having an inner diameter of 11.9 mm. The evaluation value of sex is 40% or less. 　　Evaluation value of liquidity (%) = {(Y / X) -1} x 100 [0014] 　Specifically, the funnel is a funnel having the shape shown in FIG. This funnel has the same shape as the "bulk specific gravity measuring device" described in Appendix 2 of JIS K 6720 (1998), but has the uppermost diameter (the length of a shown in FIG. 1). 94.9 mm, the height of the truncated cone (length b shown in FIG. 1) is 114 mm, and the inner diameter of the falling particle portion (length c shown in FIG. 1) is 11.9 mm. It is a funnel. The inclination of the conical trapezoidal slope (angle of d shown in FIG. 1) is 20 °. [0015] 　The propylene-based block copolymer has a property that it does not easily adhere to the inner wall or flow path wall of the polymer when flowing through a metal, particularly stainless steel polymerizer or flow path. [0016] 　1. 1. Propylene-based block copolymer 　The propylene-based block copolymer is a propylene-based polymer containing a rubber component, an amorphous or low-crystalline ethylene / propylene copolymer (EPR), and an amorphous ethylene / α-olefin. It is a copolymer obtained by directly polymerizing a polymer or the like. The propylene-based block copolymer of the present application is preferably in the form of particles, and more preferably propylene-based block copolymer particles formed during polymerization described later. [0017] 　The propylene-based block copolymer is not particularly limited as long as it is a block copolymer containing a structural unit derived from propylene, but it has an excellent balance of rigidity, impact resistance and moldability, and facilitates a molded product having a good appearance. It is preferable that the copolymer contains a rubber component, and a component soluble in n-decane at 23 ° C. (hereinafter, also referred to as “Dsol component”) and n at 23 ° C. -It is more preferable that the copolymer has a component that is sparingly soluble in decane (hereinafter, also referred to as "Dinsol"). [0018] 　The Dsol component refers to a component in which a propylene block copolymer is dissolved by heating in n-decane at 150 ° C. for 2 hours, then cooled to 23 ° C., and then dissolved in the n-decane solution side. The other component in the propylene-based block copolymer is the Dinsol component. [0019] 　The Dsol component can be a component whose main component is the rubber component, and is a copolymer of propylene and one or more α-olefins selected from ethylene and α-olefins having 4 or more and 20 or less carbon atoms. It is preferable that the coalesced rubber component is the main component. More specifically, the amount of the rubber component of the Dsol component is more than 50% by mass, preferably 80% by mass or more and 100% by mass or less, and more preferably 90% by mass or more and 100% by mass or less. [0020] 　Examples of the α-olefin having 4 or more and 20 or less carbon atoms include 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene, 1-decene, 1-dodecene, 1-. Includes tetradecene, 1-hexadecene, 1-octadecene, 1-eicosene and the like. The α-olefin to be copolymerized is preferably an α-olefin selected from ethylene or an α-olefin having 4 or more and 10 or less carbon atoms, and is preferably ethylene, 1-butene, 1-pentene, 1-hexene, 4-. More preferably, it is an α-olefin selected from methyl-1-pentene, 1-octene, and 1-decene. [0021] 　The amount of structural unit derived from ethylene contained in the Dsol component and one or more α-olefins selected from α-olefins having 4 or more and 20 or less carbon atoms includes a crystalline propylene-based (co) polymer component described later and a decane. It is larger than the amount of structural unit derived from ethylene or α-olefin having 4 or more and 20 or less carbon atoms contained in the insoluble component (Dinsol component), and is usually 25 mol% or more of the above-mentioned copolymer rubber. [0022] 　In particular, since the Dsol component containing ethylene units tends to have a low glass transition temperature, it is preferable that the Dsol component contains a large amount of ethylene units. The lower limit of the content of the ethylene unit in the Dsol component is preferably 30 mol%, more preferably 36.0 mol%, still more preferably 40 mol%. On the other hand, the preferable upper limit value is 70 mol%, more preferably 65 mol%, still more preferably 60 mol%. [0023] 　When the content of ethylene units is relatively high, the glass transition temperature of the rubber component is lowered and the crystallinity is also lowered, so that the rubber component is soft and tends to flow easily at a particularly high temperature. In the present invention, even a propylene-based block copolymer containing a large amount of such a easily flowing rubber component is considered to be excellent in productivity because the polymer is unlikely to adhere in a polymer or silo described later. Conceivable. [0024] 　The content of the Dsol component in the propylene block copolymer is 5 with respect to 100% by mass of the total of the Dsol component and the Dinsol component from the viewpoint of easily obtaining a molded product having an excellent balance of rigidity and impact resistance. It is preferably mass% or more and 50 mass% or less, more preferably 10 mass% or more and 50 mass% or less, further preferably 25 mass% or more and 50 mass% or less, and 30 mass% or more and 40 mass% or less. The following is particularly preferable. [0025] 　The ultimate viscosity [η] of the Dsol component is 1 from the viewpoint that a composition having a good balance of impact resistance, high fluidity, and high melt elasticity can be easily obtained, and a molded product having a good appearance can be easily obtained. It is preferably .5 dl / g or more and 10.0 dl / g or less, and more preferably 2.0 dl / g or more and 7.0 dl / g or less. [0026] 　For the above [η], 20 mg of a propylene-based block copolymer is dissolved in 15 ml of decalin, the specific viscosity ηsp is measured in an oil bath at 135 ° C., and 5 ml of the decalin solvent is added to this decalin solution for dilution. In the relational expression showing the relationship between the concentration and the specific viscosity, which is obtained by repeating the operation of measuring the specific viscosity ηsp three more times in the same manner, the ηsp / C when the concentration (C) is extrapolated to 0. Can be a value. [0027] 　The Dinsol component is a component containing a crystalline propylene-based (co) polymer component as a main component. More specifically, the amount of the crystalline propylene-based (co) polymer component in the Dinsol component is preferably more than 50% by mass, preferably 80% by mass or more and 100% by mass or less, and 90% by mass or more and 100% by mass. More preferably, it is less than%. [0028] 　The crystalline propylene-based (co) polymer component is one or more α-olefins of a crystalline propylene homopolymer or an α-olefin composed of propylene and ethylene and an α-olefin having 4 or more and 20 or less carbon atoms. It is a copolymer with olefin. However, the amount of the structural unit derived from the α-olefin is 1.5 mol% or less of the crystalline propylene-based (co) polymer component. [0029] 　The content of the Dinsol component in the propylene-based block copolymer is 100% by mass in total of the Dsol component and the Dinsol component from the viewpoint that a molded product having an excellent balance of rigidity and impact resistance can be easily obtained. On the other hand, it is preferably 50% by mass or more and 95% by mass or less, more preferably 50% by mass or more and 90% by mass or less, further preferably 50% by mass or more and 75% by mass or less, and 60% by mass or more. It is particularly preferably 70% by mass or less. [0030] 　Examples of the α-olefin having 4 or more and 20 or less carbon atoms include 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene, 1-decene, 1-dodecene, 1-. Includes tetradecene, 1-hexadecene, 1-octadecene, 1-eicosene and the like. The α-olefin to be copolymerized is preferably an α-olefin selected from ethylene or an α-olefin having 4 or more and 10 or less carbon atoms, and is preferably ethylene, 1-butene, 1-pentene, 1-hexene, 4-. More preferably, it is an α-olefin selected from methyl-1-pentene, 1-octene, and 1-decene. [0031] 　The melt flow rate (MFR) of the propylene-based block copolymer measured at 230 ° C. and a load of 2.16 kg can be 5 g / 10 minutes or more and 300 g / 10 minutes or less, and 5 g / 10 minutes or more and 200 g / g. It is preferably 10 minutes or less. [0032] 　When the MFR is in the above range, the propylene-based block copolymer is excellent in fluidity, so that a composition capable of easily performing injection molding can be obtained from the propylene-based block copolymer. Further, from the composition, a molded product having excellent impact resistance and which can be suitably used for automobile parts and the like can be easily obtained. [0033] 　The content of the propylene-based block copolymer with respect to the total mass of the composition is 58% by mass or more and 90% by mass or less from the viewpoint of easily obtaining a molded product having an excellent balance between rigidity and impact resistance. It is preferably 60% by mass or more and 90% by mass or less. [0034] 　The composition includes resins other than the propylene block copolymer, light-resistant stabilizers, heat-resistant stabilizers, weather-resistant stabilizers, antioxidants, antioxidants, fatty acid metal salts, softeners, dispersants, and fillers. , Colorants, pigments, antioxidants, slip agents, antiblocking agents, antifogging agents, lubricants, natural oils, synthetic oils, waxes and other other ingredients. [0035] 　2. 2. Production of 　propylene-based block copolymer The propylene-based block polymer first synthesizes the components constituting the Dinsol component, particularly the crystalline propylene-based (co) polymer, and subsequently constitutes the Dsol component. It is obtained by polymerizing a component, particularly the rubber component, with a component constituting the Dinsol component. At this time, the components constituting the Dinsol component are synthesized and the components constituting the Dsol component are polymerized using the solid titanium catalyst component (i) produced using the following solid compound (S) as a starting material as a catalyst. As a result, the above-mentioned evaluation value of liquidity can be set to 40 or less. The above solid compound is preferably a solid compound as described later. [0036] 　2-1. Production of 　Solid Titanium Catalyst Component (i) The solid titanium catalyst component (i) is a solid compound (S) represented by the following formula (I) having a first pore distribution index of 2 or more, and titanium. The compound can be produced by contacting the compound. At this time, from the viewpoint of increasing the molecular weight of the obtained polymer and making it easier to control the molecular weight distribution, the electron donor is further contacted to include the electron donor in the solid titanium catalyst component (i). You may. [0037] 　　First pore distribution index = x / y ... (I) [0038] 　In the formula (I), x is the cumulative pore volume with a pore diameter of 0.001 to 0.1 μm measured with a mercury porosimeter, and y is the cumulative pore volume with a pore diameter of 0.1 to 1.0 μm measured with a mercury porosimeter. [0039] 　The preferable lower limit value of the first pore distribution index is 2.0, more preferably 2.1, and even more preferably 2.2. On the other hand, the upper limit is not particularly limited, but is preferably 12, more preferably 10, still more preferably 8, and particularly preferably 7. [0040] 　In the above formula (I), the pores having a relatively small pore diameter, that is, 0.001 to 0.1 μm, are considerably larger than the pores having a relatively large pore diameter, that is, 0.1 to 1.0 μm. It is a parameter that suggests that. Alternatively, it can be considered as a parameter suggesting a tendency for relatively small and deep pores to be present. [0041] 　Further, in the solid compound (S), the second pore distribution index represented by the following formula (I') is preferably a value exceeding 0.5. The second pore distribution index is more preferably 0.56 or more, further preferably 0.58 or more, particularly preferably 0.60 or more, and particularly preferably 0.62 or more. The upper limit is, of course, 1. More preferably, it is 0.745. [0042] 　　Second pore distribution index = xα / xβ ... (I') [0043] 　In formula (I'), xα is the cumulative pore volume with a pore diameter of 0.01 to 0.1 μm measured with a mercury porosimeter, and xβ is the cumulative pore volume with a pore diameter of 0.001 to 1.0 μm measured with a mercury porosimeter. .. [0044] 　The second pore distribution index indicates that in the catalyst of the present invention, pores of 0.01 to 0.1 μm are the main presence on the volume basis. It can be easily inferred that the excellent particle fluidity, which is a feature of the present invention, is greatly influenced by the existence of this pore size. [0045] 　The pore volume of the solid compound according to the present invention having a pore diameter of 0.001 to 1.0 μm is not particularly limited as long as it is within the scope of the object of the present invention. Preferably, it is 50 mm 3 / g or more and 1500 mm 3 / g or less. A more preferable lower limit value is 80 mm 3 / g, more preferably 100 mm 3 / g, and particularly preferably 120 mm 3 / g. On the other hand, a more preferable upper limit value is 1000 mm 3 / g, more preferably 800 mm 3 / g, and particularly preferably 500 mm 3 / g. 　Within the range of such pore volume, favorable effects such as suppression of the blocking property tend to appear. [0046] 　The propylene-based block copolymer of the present invention has a characteristic that fusion to the inner wall of a polymer or silo is unlikely to occur, for example, but in order to realize this, the above formula (I) is important. The inventors are thinking. The mechanism is not clear at this time, but the following speculations are possible. [0047] 　It is said that the shape of the solid compound as a raw material tends to be inherited by the solid titanium catalyst component (i). Therefore, the solid compound (S) having a shape satisfying such a regulation has a large proportion of pore diameters of a specific size, which is relatively small, and therefore, probably due to the frictional resistance of the surface based on the large surface area, the rubber component. The present inventors consider that bleeding to the surface of the rubber may be unlikely to occur. [0048] 　On the other hand, if the pore diameter is too small, it is considered that the rubber component, for example, which causes a volcano to explode, is likely to diffuse to the surface. Further, if the pore diameter is too large, it may penetrate into other pores inside, and the rubber component may rather easily exude to the surface. [0049] 　Therefore, the present inventors consider that a high proportion of pores in a specific pore diameter range is an important requirement for exhibiting the effects of the present invention. [0050] 　2-1-1. Solid Compound (S) The 　solid compound (S) is characterized in that it contains a magnesium compound (II-0). A preferable magnesium compound is a magnesium compound used in a raw material complex described later. [0051] 　The preferred solid compound (S) has a structure of a solid compound having a composition represented by the formula (II). 　　MgX a Rs b · (RtOH) m　　 ... (II) [0052] 　In formula (II), X is a halogen atom, Rs is a heteroatom-containing hydrocarbon group, Rt is a carbon hydrogen group that may contain a heteroatom, and m is 2.0 ≦ m ≦ 3.3. It is a real number to be satisfied, a is an integer satisfying 0 ≦ a ≦ 2, b is an integer satisfying 0 ≦ b ≦ 2, and the sum of a and b is 2. [0053] 　Rs in the formula (II) can be an alkoxy group, an aryloxy group, a carboxylate group, or the like. [0054] 　The structure represented by RtOH in the formula (II) is a structure derived from an alcohol represented by RtOH. Examples of the above alcohols include methanol, ethanol, propanol, butanol, isobutanol, ethylene glycol, 2-methylpentanol, 2-ethylbutanol, n-heptanol, n-octanol, 2-ethylhexanol, decanol, and dodecanol. Fatty alcohols containing, cyclohexanols, alicyclic alcohols including methylcyclohexanols, aromatic alcohols including benzyl alcohols, methylbenzyl alcohols, etc., and aliphatic alcohols containing n-butylcellsolve and the like. Includes tribal alcohol and the like. [0055] 　The solid compound (S) represented by the formula (II) is, for example, in a slurry-like liquid containing a complex represented by the formula (III) (sometimes referred to as a raw material complex) and a hydrocarbon solvent. It can be produced by continuously contacting an inert gas at a liquid temperature of 25 ° C. or higher and 80 ° C. or lower. 　　MgX a Rs b · (RtOH) n ... (III) [0056] 　In formula (III), X, Rs and Rt are the same as X, Rs and Rt in formula (II), and n is a real number satisfying 0.45 ≦ m / n ≦ 0.99. [0057] 　The raw material complexes include magnesium halide, magnesium halide containing magnesium bromide, methoxymagnesium chloride, magnesium ethoxychloride, and alkoxymagnesium halide containing magnesium phenoxychloride, ethoxymagnesium, isopropoxymagnesium, butoxymagnesium, and 2. -Malkene compounds such as alkoxymagnesium containing ethylhexoxymagnesium, allyloxymagnesium containing phenoxymagnesium, and magnesium carboxylates including magnesium stearate, and the above-mentioned alcohol represented by RtOH, particularly It can be produced by contacting an alcohol that dissolves the magnesium compound by a known method. [0058] 　The alcohol component (RtOH) is gently removed from the raw material complex by continuously contacting the slurry-like liquid containing the raw material complex and the hydrocarbon solvent with an inert gas at a liquid temperature of 25 ° C. or higher and 80 ° C. or lower. , Solid compound (S) is produced. [0059] 　The inert gas is a rare gas containing helium, neon, argon, etc., a hydrocarbon gas containing methane, ethane, propane, etc., and a gas such as nitrogen, which does not substantially react with titanium compounds or organic metal compounds. All you need is. [0060] 　The slurry concentration of the slurry-like liquid is not particularly limited, but is preferably 10 g / L or more and 200 g / L or less, preferably 30 g / L in consideration of the fluidity and the protective function of the solid compound (S). More preferably, it is 150 g / L or less. [0061] 　The liquid temperature of the slurry-like liquid at the time of contact is 25 ° C. or higher from the viewpoint of increasing the efficiency of removing alcohol by the inert gas, and 80 ° C. from the viewpoint of suppressing deterioration of the solid compound (S). From the above viewpoint, the liquid temperature at the time of contact is preferably 25 ° C. or higher and 80 ° C. or lower, and more preferably 40 ° C. or higher and 70 ° C. or lower. [0062] 　The supply rate of the inert gas is preferably 5 NL / hr or more and 300 NL / hr or less, more preferably 5 NL / hr or more and 40 NL / hr or less, per 1 L of the slurry-like liquid. It is more preferably hr or more and 30 NL / hr or less, particularly preferably 5 NL / hr or more and 25 NL / hr or less, and particularly preferably 7 NL / hr or more and 20 NL / hr or less. When the supply rate is 5 NL / hr or more, the efficiency of removing alcohol by the inert gas can be sufficiently increased. [0063] 　The supply time of the inert gas is preferably 1 hour or more and 60 hours or less, more preferably 3 hours or more and 40 hours or less, further preferably 3 hours or more and 36 hours or less, and 3 hours or more. It is particularly preferably 20 hours or less, and particularly preferably 5 hours or more and 15 hours or less. When the supply rate is 1 hour or more, the efficiency of removing alcohol by the inert gas can be sufficiently increased. [0064] 　When the above-mentioned inert gas is supplied, the inside of the system can be homogenized by a method such as stirring the inside of the system with a stirring blade or the like. Depending on the method of supplying the inert gas and the device of the supply position, the inert gas can form a homogeneous state in the system similar to stirring. For example, a method of installing an inert gas outlet in the lower part of the system or a method of arranging a large number of inert gas outlets in the system can be mentioned. [0065] 　By appropriately adjusting the slurry concentration, the liquid temperature at the time of contact, the supply rate of the inert gas, and the supply time of the inert gas, the first pore distribution index represented by the formula (I) is 2 or more. A solid compound (S) can be produced. [0066] 　Since the above method is a reaction in a liquid phase environment using a hydrocarbon compound, it is possible to control the temperature and the amount of inert gas used, which is considered to be responsible for removing alcohol, with relative precision. Therefore, it is an effective method for forming a solid compound (S) having a highly controlled structure that satisfies the above formula (I). [0067] 　In addition to the above method, a method for removing alcohol in the gas phase can also be used. From the viewpoint of ease of controlling the shape, the above-mentioned preparation method in a liquid phase environment is preferable. [0068] 　2-1-2. Titanium Compound The titanium compound 　for producing the solid titanium catalyst component (i) by contacting it with the solid compound (S) has a composition represented by the formula (IV). 　　Ti (OR) g X 4-g　　　　　　... (IV) [0069] 　In formula (IV), R is a hydrocarbon group, X is a halogen atom, and g is an integer satisfying 0 ≦ g ≦ 4 (when a is 0 in formula (II), g = 4 is excluded). is there. [0070] 　Examples of R in formula (IV) include methyl group, ethyl group, propyl group, butyl group and the like. [0071] 　Examples of titanium compounds represented by the formula (IV) include titanium tetrahalogenated titanium containing TiCl 4 , TiBr 4, etc., Ti (OCH 3 ) Cl 3 , Ti (OC 2 H 5 ) Cl 3 , Ti (O). -N—C 4 H 9 ) Cl 3 , Ti (OC 2 H 5 ) Br 3 , and Ti (O—isoC 4 H 9 ) Br 3 and other trihalogenated alkoxy titanium, Ti (OCH 3 ) 2 Cl 2 , And Ti (OC 2 H 5)) Monohalogenation containing dihalogenated alkoxytitanium containing 2 Cl 2, etc., Ti (OCH 3 ) 3 Cl, Ti (On-C 4 H 9 ) 3 Cl, and Ti (OC 2 H 5 ) 3 Br, etc. Includes alkoxytitanium and tetraalkoxytitanium containing Ti (OCH 3 ) 4 , Ti (OC 2 H 5 ) 4 , Ti (OC 4 H 9 ) 4 , and Ti (O-2-ethylhexyl) 4 and the like. .. Of these, titanium tetrahalogenate is preferable, and titanium tetrachloride (TiCl 4).) Is more preferable. [0072] 　2-1-3. Electron donor 　The electron donor can be an aromatic carboxylic acid ester, an alicyclic carboxylic acid ester, a polyether compound, or the like. [0073] 　In particular, the electron donor is preferably an alicyclic polyvalent carboxylic acid ester represented by the formula (V) or the formula (VI), a polyether compound, or the like. 　　R d (COOR e ) p　　　　　　　... (V) 　　R d (OCOR e ) p　　　　　　　... (VI) [0074] 　In formulas (V) and (VI), R d is an alicyclic hydrocarbon having 5 or more and 20 or less carbon atoms , Re is a hydrocarbon group having 6 or more and 15 or less carbon atoms, and p is 2. Or an integer of 3. [0075] 　Examples of the alicyclic polyvalent carboxylic acid ester represented by the formula (V) include cyclohexyl-1,2-dihexanoate, cyclohexyl-1,2-dioctanoate, cyclohexyl-1,2-didecanoate, and cyclohexyl-1,2-. Didodecanoate, cyclohexyl-1,2-diheptanoate, 3,6-dimethylcyclohexyl-1,2-dioctanoate, 3,6-dimethylcyclohexyl-1,2-deceneate, 3,6-dimethylcyclohexyl-1,2-dodeceneate, 3 Included are -methyl-6-propylcyclohexyl-1,2-dioctanete, 3-methyl-6-propylcyclohexyl-1,2-dideceneate, and 3-methyl-6-propylcyclohexyl-1,2-dideceneate. [0076] 　Examples of the alicyclic polyvalent carboxylic acid ester represented by the formula (VI) include dioctyl 3,6-dimethylcyclohexane-1,2-dicarboxylic acid, and didecyl 3,6-dimethylcyclohexane-1,2-dicarboxylic acid. Dioctyl 3-methyl-6-ethylcyclohexane-1,2-dicarboxylic acid, didecyl 3-methyl-6-ethylcyclohexane-1,2-dicarboxylic acid, 3-methyl-6-n-propylcyclohexane-1,2-dicarboxylic acid Dioctyl acid, didecyl 3-methyl-6-n-propylcyclohexane-1,2-dicarboxylic acid, dioctyl 3,6-diethylcyclohexane-1,2-dicarboxylic acid, and 3,6-diethylcyclohexane-1,2-dicarboxylic acid An alicyclic polyvalent carboxylic acid ester in which the cyclic skeleton is substituted with a hydrocarbon group or the like, including didodecyl acid, and cyclohexane-1,2-dicarboxylic acid di-n-hexyl, cyclohexane-1,2-dicarboxylic acid. The cyclic skeleton has no substituents other than carboxylic acid esters, including diheptyl, dioctyl cyclohexane-1,2-dicarboxylic acid, didecyl cyclohexane-1,2-dicarboxylic acid, and didodecyl cyclohexane-1,2-dicarboxylic acid An alicyclic polyvalent carboxylic acid ester and the like are included. [0077] 　The polyether compound is an aromatic carboxylic acid ester or a compound having two or more ether bonds arranged on both sides via a plurality of carbon atoms. Examples of the above-mentioned polyether compounds include 2-isopropyl-2-isobutyl-1,3-dimethoxypropane, 2,2-diisobutyl-1,3-dimethoxypropane, and 2-isopropyl-2-isopentyl-1,3-dimethoxy. Includes 1,3-diethers such as propane, 2,2-dicyclohexyl-1,3-dimethoxypropane, and 2,2-bis (cyclohexylmethyl) 1,3-dimethoxypropane. [0078] 　2-1-4. Contact between 　solid compound (S), titanium compound and electron donor By contacting the solid compound (S), the titanium compound represented by the formula (IV), and optionally the electron donor, the above The solid titanium catalyst component (i) can be produced. [0079] 　When these components are brought into contact, they are solidified by further contacting electron donors such as aliphatic carboxylic acid esters, aromatic carboxylic acid esters, alcohols, aldehydes, ketones, ethers, amines, silane compounds, and phosphoric acid esters. The stereoregularity of the obtained propylene-based block copolymer can be enhanced while maintaining the high catalytic activity of the titanium catalyst component (i). [0080] 　The contact can be performed by a known method such as the following (P-1) to (P-3). 　(P-1) The slurry of the solid compound (S), the liquid titanium compound, and preferably one or more of the above-mentioned electron donors are suspended in the coexistence of an inert hydrocarbon solvent. 　(P-2) The slurry of the solid compound (S) to be contacted , the liquid titanium compound, and preferably one or more of the above-mentioned electron donors are brought into contact with each other in a plurality of times 　(P-3). The slurry of the solid compound (S), the liquid titanium compound, and preferably one or more of the above-mentioned electron donors are divided into a plurality of times in a suspended state in the coexistence of an inert hydrocarbon solvent. To contact [0081] 　2-2. Production of propylene-based block copolymer The 　above-mentioned propylene-based block copolymer is propylene and optionally other α-olefin in the presence of the solid titanium catalyst component (i), preferably the olefin polymerization catalyst. In the first polymerization step of producing a crystalline propylene-based (co) polymer by polymerizing the above, and the crystalline propylene-based (co) polymer produced in the first polymerization step, a rubber component, and amorphous Alternatively, it can be produced through a second polymerization step of polymerizing a low crystalline ethylene / propylene copolymer (EPR) and a raw material of an amorphous ethylene / α-olefin copolymer. [0082] 　Both the first polymerization step and the second polymerization step may be carried out by any of a liquid phase polymerization method including a bulk polymerization method, a dissolution polymerization method, a suspension polymerization method and the like, and a gas phase polymerization method. .. [0083] 　In the first polymerization step and the second polymerization step, the solid titanium catalyst component (i) contains at least one element selected from the group consisting of Group 1 elements, Group 2 elements and Group 13 elements. The organic metal compound (ii) may be further contacted to serve as a catalyst for olefin polymerization. At that time, the electron donor (iii) may be further contacted. [0084] 　Examples of the organometallic compound (ii) include compounds containing Group 13 elements such as organic aluminum compounds, complex alkylated products of Group 1 elements and aluminum, and organometallic compounds containing Group 2 elements. Is done. [0085] 　Examples of the electron donor (iii) include an organosilicon compound represented by the formula (VII), a silane compound represented by the formula (VIII), a compound represented by the formula (IX), and the like. 　　R n Si (OR ')　　　　　 4-n 　　· · · (VII) Si (OR a ) 3 (NR b R c ) 　　· · · (VIII) RNSi (OR a　　　　　　　) 3 · · · (IX) [0086] 　In formula (VII), R and R'are hydrocarbon groups and n is an integer of 0