Abstract:
The present invention aims at providing a process for producing a solid catalyst for olefin polymerization, the solid catalyst component being capable of providing a polymer having high stereoregularity when an α-olefin is polymerized; a process for producing a solid catalyst component, which is used for producing the solid catalyst; and a process for producing an olefin polymer using the solid catalyst. This object can be achieved by a process for producing a solid catalyst component (A), the process including a step of bringing a titanium compound (a), a magnesium compound (b) and an internal electron donor represented by Formula (I) into contact with each other: where R1 is a hydrocarbyl group having 1 to 20 carbon atoms; R2, R3, R4, and R5 are each independently selected from a hydrogen atom, a halogen atom and a hydrocarbyl group having 1 to 20 carbon atoms, and at least one selected from R2, R3, R4, and R5 is a hydrocarbyl group having 1 to 20 carbon atoms; and R6 is a halogen atom.
Abstract:
There are provided an ethylene-propylene copolymer having the following structural characteristics, and a polypropylene resin composition comprising the above copolymer and polypropylene having a melting temperature of 160° C. or higher: (1) its propylene content is 20 to 60% by mol; (2) its product of a monomer reactivity ratio is less than 2.5; (3) its intrinsic viscosity is more than 1.0 dl/g; (4) its molecular weight distribution is more than 3; (5) its glass transition temperature is lower than −40° C.; (6) its heat of crystallization is less than 5.0 J/g; (7) in a temperature rising elution fractionation method, its elution amount is 60% by weight or more in a temperature range of lower than 10° C., its elution amount is 3% by weight or more in a temperature range of 10° C. to lower than 55° C., and its elution amount is 5% by weight or less in a temperature range of 83° C. or higher, provided that the total elution amount is 100% by weight; and (8) an intensity ratio of a racemic peak to a meso peak in an ethylene-propylene binding moiety in a 13C-NMR spectrum is 0.01 to 0.7.
Abstract:
A production process of a propylene block copolymer, comprising the step (I) of polymerizing propylene alone or a combination of propylene with an olefin other than propylene, in the presence of a defined polymerization catalyst, to form a polymer component (1), and the step (II) of copolymerizing propylene with an olefin other than propylene in the presence of the polymer component (1), to form a polymer component (2), wherein a combination of a transition metal compound such as Zr(OR1)4 and Hf(OR1)4 (R1 being a hydrocarbon group) with an ether group-containing linear hydrocarbon compound and/or a Lewis base compound is added to the above polymerization system between the ending point of the step (I) and the starting point of the step (II), or during the step (II).
Abstract:
A production process of an α-olefin polymerization catalyst, comprising the steps of (1) reducing a titanium compound represented by a defined formula with an organomagnesium compound in the presence of an Si—O bond-containing silicon compound, (2) contacting the resultant solid catalyst component precursor, a halogenating compound and an internal electron donor with one another, and (3) contacting the resultant solid catalyst component, an organoaluminum compound and a Si-containing external electron donor represented by a defined formula with one another; and a production process of an olefin polymer using the above catalyst.
Abstract:
A production process of a propylene block copolymer, comprising the step (I) of polymerizing propylene alone or a combination of propylene with an olefin other than propylene, in the presence of a defined polymerization catalyst, to form a polymer component (1), and the step (II) of copolymerizing propylene with an olefin other than propylene in the presence of the polymer component (1), to form a polymer component (2), wherein a combination of a transition metal compound such as Zr(OR1)4 and Hf(OR1)4 (R1 being a hydrocarbon group) with an ether group-containing linear hydrocarbon compound and/or a Lewis base compound is added to the above polymerization system between the ending point of the step (I) and the starting point of the step (II), or during the step (II).
Abstract:
A propylene block copolymer satisfying the following requirements, which is obtained by producing in the step 1 a propylene polymer component (1), producing in the step 2 a propylene copolymer component (2) in the presence of the component (1), and producing in the step 3 an ethylene copolymer component (3) in the presence of the components (1) and (2): the component (1) has a melting temperature of 155° C. or higher; the component (2) contains 40 to 50% by mol of ethylene, and has an intrinsic viscosity of 2.0 to 8.0 dl/g; the component (3) contains 45 to 70% by mol of ethylene, and has an intrinsic viscosity of 3.0 to 8.0 dl/g, provided that the ethylene content is larger than the ethylene content in the propylene polymer component (2); a ratio by weight of the component (2) to the component (3) is 1/10 to 1/1; the propylene block copolymer has a glass transition temperature of −55.0° C. or lower; and dispersed particles contained in an injection molded article of the block copolymer have a volume-average particle diameter of 1.0 μm or less, provided that the above particles have a round shape in their cross-section.
Abstract:
There are disclosed a process for producing a solid catalyst component and a catalyst for α-olefin polymerization, and a process for producing an α-olefin polymer, wherein the process for producing a solid catalyst component comprises the steps of: (1) reducing a specific titanium compound with an organomagnesium compound in the presence of an organosilicon compound having an Si—O bond (and an ester compound), thereby obtaining a solid product, and (2) contacting the solid product with a halogeno compound of the 14 group element, at least one member selected from the group consisting of an electron donor compound and an organic acid halide, and a compound having a Ti-halogen bond, thereby obtaining the solid catalyst component.
Abstract:
There are disclosed a process for producing a solid catalyst component and a catalyst for α-olefin polymerization, and a process for producing an α-olefin polymer, wherein the process for producing a solid catalyst component comprises the steps of: (1) reducing a specific titanium compound with an organomagnesium compound in the presence of an organosilicon compound having an Si—O bond (and an ester compound), thereby obtaining a solid product, and (2) contacting the solid product with a halogeno compound of the 14 group element, at least one member selected from the group consisting of an electron donor compound and an organic acid halide, and a compound having a Ti-halogen bond, thereby obtaining the solid catalyst component.
Abstract:
A production process of a propylene block copolymer, comprising the steps of (I) contacting a solid catalyst component containing titanium atoms, magnesium atoms and halogen atoms with an organoaluminum compound and an external electron donor represented by the defined formula, thereby forming a polymerization catalyst, (II) polymerizing propylene in the presence of the polymerization catalyst, thereby forming a polymer component (1) having an intrinsic viscosity, [η]1, and (III) copolymerizing propylene with an olefin other than propylene in the presence of the polymer component (1), thereby forming a polymer component (2) having an intrinsic viscosity, [η]2, which is three times or more [η]1.
Abstract:
There are provided a polypropylene resin composition and a molded article thereof, the composition comprising: 60 to 85% by weight of a propylene homopolymer; and 15 to 40% by weight of an ethylene-α-olefin random copolymer containing 45 to 70 parts by mol of ethylene units, and 30 to 55 parts by mol of α-olefin units, and satisfying the following requirements (1) to (5), (1) the propylene homopolymer has a melting temperature of 163 to 170° C.; (2) the propylene homopolymer contains 0.01% or less of regio defects resulted from a 2,1-insertion and a 1,3-insertion in all propylene units; (3) the polypropylene resin composition has a ratio B/A of 0.9 or more, provided that A (% by weight) is an amount of the ethylene-α-olefin random copolymer contained in the polypropylene resin composition, and B (% by weight) is an amount of soluble parts in xylene at a room temperature contained in the polypropylene resin composition; (4) the ethylene-α-olefin random copolymer has a molecular weight distribution of 2.0 to 4.0; and (5) the ethylene-α-olefin random copolymer contained in the polypropylene resin composition has a shape of a particle, whose volume-average particle diameter is 1.0 μm or less, measured by observing a cross-section of a 0.5 mm-thick sheet with a transmission electron microscopy, the sheet being obtained by hot press-molding the above polypropylene resin composition at 190° C. for 3 minutes under a pressure of 35 kgf/cm2, provided that the cross-section of the above particle has a round shape.