34 results about "Ziegler–Natta catalyst" patented technology

The present application provides a kind of Ziegler-Natta catalyst for preparing high molecular weight polyethylene with narrow molecular weight distribution, porous polymer microspheres are used as carrier, load the Ziegler-Natta catalyst doped with trace metallocene, the doping amount of metallocene is 0.01-2wt% of the amount of Ziegler-Natta catalyst.The preparation method includes the reaction of porous polymer microspheres with alkyl magnesium chloride, then with aluminoxane compound, then the product is reacted with titanium tetrachloride, finally, add metallocene to the product to obtain Ziegler-Natta catalyst.The present application uses porous polymer microspheres as carrier, dopes trace metallocene in Ziegler-Natta catalyst, and the composite catalyst prepared is used for the synthesis of high molecular weight polyethylene, and high molecular weight polyethylene with narrow molecular weight distribution can be obtained, which can meet the application needs of lithium ion battery separator materials.

Processes of polymerizing olefin monomers and catalyst systems. The catalyst systems include a non-hydrogen-generating post-metallocene procatalyst; a co-catalyst; and a hydrogenation procatalyst having the formula Cp2TiXnTiCp2 or Cp2TiXn, in which each Cp is cyclopentadienyl substituted with at least one (C1-C10)alkyl; each X is independently monoanionic or neutral, wherein each X is independently (C1-C40)hydrocarbon, (C1-C40)heterohydrocarbon, (C1-C40)hydrocarbyl, (C1-C40)heterohydrocarbyl, or a halogen atom; and n is 1 or 2.

This invention relates to a Ziegler-Natta catalyst for olefin polymerization and a method for producing polyolefins with excellent processability using the same. The Ziegler-Natta catalyst for olefin polymerization is characterized by its ability to produce polyolefins with excellent processability because it contains at least one external electron donor that satisfies a specific formula based on an alkoxysilane (silicate), thereby increasing the number of active sites of the titanium compound.

The catalyst system includes a heterogeneous procatalyst and a hydrogenation procatalyst. The heterogeneous procatalyst includes a titanium species, an aluminum species, and a magnesium chloride component. The hydrogenation procatalyst has the formula Cp2TiX2, In formula Cp2TiX2, each Cp is a cyclopentadienyl substituted with at least one R1, wherein R1 is (C1-C10)alkyl; and each X is independently a halogen atom.

The present invention relates to use of optionally monosubstituted 2,2-di(tetrahydrofuryl)methanes, as internal donors in Ziegler-Natta catalysts to obtain polymers with desirable properties. The present disclosure further concerns Ziegler-Natta catalyst components comprising said optionally monosubstituted 2,2-di(tetrahydrofuryl)methanes and Ziegler-Natta catalysts for olefin polymerization comprising said Ziegler-Natta catalyst components as well as a method for preparing the same and their use in providing polyolefins.

The present invention discloses a Ziegler-Natta catalyst composition comprising: one or more Ziegler-Natta procatalyst compositions comprising magnesium, titanium, a halogen, one or more internal electron donors; one or more aluminum-containing co-catalysts; optionally one or more stereoselectivity control agents (SCAs); and one or more activity limiting agents (ALA) including one or more alkyl-, cycloalkyl-or aryl carbonates and derivatives. Such Ziegler-Natta catalyst compositions exhibit self-limiting catalyst activity in the polymerization of olefins, particularly propylene.

The present disclosure relates to a method for preparing a Ziegler-Natta catalyst for polymerization of a low-density copolymer, and in particular, to a method for preparing a Ziegler-Natta catalyst including preparing a magnesium chloride support using an inorganic chloride as a halogen source of the magnesium chloride support. In the method for preparing a Ziegler-Natta catalyst according to an embodiment, an inorganic chloride is used when preparing the magnesium chloride support, such that reaction conditions are mild and generation of impurities is minimized, which is preferable for large-scale preparation of catalysts.

Embodiments disclosed herein relate to a pre-catalyst, a catalyst and a process for polymerizing propylene. The phthalate-free Ziegler-Natta pre-catalyst comprises a Mg-based support; a transition metal selected from Groups 4 to 8 of the periodic table; a first internal electron donor (ID1) consisting of at least one diester; a second internal electron donor (ID2) consisting of at least one 1,3-diether. The at least one diester comprises one or more maleates and / or substituted maleates. The at least one 1,3-diether comprises one or more diethers represented by the general structure (I).

The Ziegler-Natta catalyst for ethylene polymerization includes not only a Ziegler-Natta main catalyst for ethylene polymerization including an internal electron donor satisfying a specific formula, but also at least one external electron donor satisfying a specific formula to increase the number of active sites of a titanium compound, the polyethylene prepared thereby using the Ziegler-Natta catalyst for ethylene polymerization has a high MFR ratio and thus has good processability, thereby ensuring an improvement in polyethylene resin productivity.

The present invention relates to tetrahydrofurfuryl derivatives and more particularly to their use as internal electron donors in Ziegler-Natta catalysts to obtain polymers with desirable properties. The present disclosure further concerns Ziegler-Natta catalyst components comprising said tetrahydrofurfuryl derivatives and Ziegler-Natta catalysts for olefin polymerization comprising said Ziegler-Natta catalyst components, as well as a method for preparing the same and their use in providing polyolefins.

The invention discloses a method for producing a low-entanglement UHMWPE supported Ziegler-Natta catalyst and the catalyst, and relates to the technical field of catalyst production, and the method comprises the following steps: S1, preparing a carrier macroporous SiO2; s2, preparing a supported catalyst; s3, ethylene polymerization; aiming at the problem of product entanglement of a Ziegler-Natta catalyst, a silica gel supported catalyst using large-aperture SiO2 as a carrier is developed, the carrier has an extremely high pore size, uniform distribution of MgCl2 on the SiO2 carrier can still be realized under a relatively high MgCl2 loading capacity, Ti active sites are fixed by the highly distributed MgCl2 through Mg-Cl-Ti chemical bonds, and the activity of the catalyst is improved. And the dispersion degree of Ti is improved through uniformly distributed MgCl2, so that the adjacent entanglement phenomenon is reduced, and the preparation of the low-entanglement UHMWPE under the industrial polymerization condition is realized.

The present invention provides a Ziegler–Natta catalyst for olefin polymerization, a method for producing a polyolefin, and a polyolefin resin, wherein the Ziegler–Natta catalyst for olefin polymerization includes: (i) a Ziegler–Natta pro-catalyst for olefin polymerization comprising a titanium compound represented by chemical formula 1, a magnesium compound represented by chemical formula 2, a first internal electron donor represented by chemical formula 3, and a second internal electron donor that is at least one selected from the group consisting of compounds represented by chemical formula 4 and chemical formula 5; (ii) an organoaluminum compound represented by chemical formula 6; and (iii) an external electron donor represented by chemical formula 7.

A Ziegler-Natta catalyst for olefin polymerization, a process for preparing a polyolefin, and a polyolefin resin are provided. Specifically, provided are a Ziegler-Natta catalyst for olefin polymerization, a method for preparing a polyolefin by using the same, and a polyolefin resin prepared by using the same. The Ziegler-Natta catalyst for olefin polymerization includes: a Ziegler-Natta main catalyst for olefin polymerization including a titanium compound represented by Chemical Formula 1, a magnesium compound represented by Chemical Formula 2, and an internal electron donor; an organoaluminum compound represented by chemical formula 7; and an external electron donor represented by Chemical Formula 3; wherein the internal electron donor is a mixture of a first internal electron donor selected from the group consisting of Chemical Formulae 4 to 6 and a second internal electron donor selected from the group consisting of Chemical Formulae 4 to 6 and different from the first internal electron donor, and 10 moles of the mixture comprises the first internal electron donor and the second internal electron donor in a molar ratio of 3: 7 to 7: 3.

The present application relates to the field of polyolefin matt film, and discloses a block copolymerized polypropylene and a preparation method thereof, a polypropylene material and a preparation method thereof, and a polypropylene film.The method comprises the following steps: (1) carrying out homopolymerization reaction on first propylene in the presence of hydrogen, a main catalyst, alkyl aluminum and organosilane to obtain product I; the main catalyst is a Ziegler Natta catalyst; (2) mixing hydrogen, second propylene, ethylene and the product I to carry out copolymerization reaction under a protective atmosphere to obtain the block copolymerized polypropylene; the block copolymerized polypropylene provided by the present application is used to prepare a polypropylene material, and the polypropylene material can be directly used as the upper layer (temperature-resistant matt layer) of BOPP matt film when applied to the polypropylene film, that is, the polypropylene film simultaneously has good matt effect and temperature resistance without an additional temperature-resistant layer.

According to the silicon-magnesium composite Ziegler-Natta catalyst carrier and the preparation method thereof provided by the invention, a spherical silica gel carrier is prepared by using a spray drying method, then porous silicon spheres with good morphology and pore structure are obtained after high-temperature activation, and then magnesium source loading is carried out, so that the silicon-magnesium composite Ziegler-Natta catalyst carrier is obtained. The finally prepared silicon-magnesium composite Ziegler-Natta catalyst carrier successfully overcomes the defects of the existing preparation technology in morphology perfection and particle size uniformity. The method provided by the invention is simple in process, easy to operate, low in cost and easy for industrial production, and the prepared porous silicon spheres have the advantages of large specific surface area, controllable pore structure, high mechanical strength and the like; the prepared silicon-magnesium composite Ziegler-Natta catalyst carrier is used for olefin polymerization reaction, and has the advantages of high effective titanium loading rate, good polymerization product perfectness, good other properties and the like.

A novel method for synthesizing spherical magnesium ethoxide (MGE) with enhanced morphology, mechanical strength, and surface smoothness is described. The process utilizes a double-jacketed reactor, equipped with a mechanical stirrer, condenser, and flow meter. Magnesium powder (60–300 microns, 17–25 wt%) and iodine (0.5–1 wt%) as an initiator are reacted with ethanol at a magnesium-to- ethanol weight ratio of 8:1 to 14:1. The reactor is maintained at 60°C for 6 hours, with stirring at 250 rpm for 5–30 minutes to initiate alkoxylation. Additional magnesium and ethanol are introduced at 10–30 minute intervals to control reaction kinetics and nucleation. A titanium tetraalkoxide modifier is added during precipitation-recrystallization. The reaction proceeds under ethanol reflux until hydrogen gas production ceases, followed by ethanol removal, heptane washing, and vacuum-drying at 70°C.

The application discloses a Ziegler-Natta catalyst for olefin polymerization, and adopts a heteroatom-containing bicyclic succinate compound shown as a general formula (I) as an internal electron donor. Because of the unique coordination mode and special space electronic structure of the compound, the catalyst obtained after loading has high catalytic activity when catalyzing propylene polymerization, the product polypropylene can reach high stereoregularity, and the molecular weight distribution is wide, so that various grades of polymer products can be developed. The application further discloses a preparation method of the supported catalyst.

The present invention relates to substituted 2-iso-propyl-1,3-dialkoxypropanes, and more particularly to their use as internal donors in Ziegler-Natta catalysts to obtain ethylene (co)polymers with desirable properties. The present disclosure further concerns use of Ziegler-Natta catalyst components comprising said substituted 2-iso-propyl-1,3-dimethoxypropanes and use of Ziegler-Natta catalysts in ethylene (co)polymerization comprising said Ziegler-Natta catalyst components.

The present invention relates to optionally substituted 1,3-dimethoxypropanes and 3-methoxypropylamines, and more particularly to their use as internal donors in Ziegler-Natta catalysts to obtain polymers with desirable properties. The present disclosure further concerns Ziegler-Natta catalyst components comprising said optionally substituted 1,3-dimethoxypropanes and 3-methoxypropylamines, and Ziegler-Natta catalysts for olefin polymerization comprising said Ziegler-Natta catalyst components, as well as a method for preparing the same and their use in providing polyolefins.

The present invention relates to a process for producing a prepolymerized solid Ziegler-Natta catalyst in batch mode, a prepolymerized solid Ziegler-Natta catalyst, a process for producing a propylene polymer using said prepolymerized solid Ziegler-Natta catalyst, a prepolymerized solid Ziegler-Natta catalyst obtained by a process as well as the use of the prepolymerized solid Ziegler-Natta catalyst in a process for producing a propylene polymer.

The present disclosure relates to a process for producing a prepolymerized Ziegler-Natta catalyst. The present invention relates to a process for preparing vinyl cycloalkanes, comprising: Ai) reacting at least one acyclic alpha-olefin having from 2 to 10 carbon atoms in the presence of a Ziegler-Natta catalyst, and Aii) subsequently reacting vinyl cycloalkanes, vinyl cycloolefins, and / or vinyl aromatics in the presence of a Ziegler-Natta catalyst; or Bi) reacting vinyl cycloalkanes, vinyl cycloolefins and / or vinyl aromatics in the presence of a Ziegler-Natta catalyst, and Bii) subsequently reacting at least one acyclic alpha-olefin having 2 to 10 carbon atoms in the presence of a Ziegler-Natta catalyst, when vinyl cycloalkanes, vinyl cycloolefins and / or vinyl arenes are reacted in Bi) in the presence of a Ziegler-Natta catalyst and at least one acyclic alpha-olefin having 2 to 10 carbon atoms is subsequently reacted in Bii) in the presence of a Ziegler-Natta catalyst, the weight ratio of the at least one acyclic alpha-olefin to the Ziegler-Natta catalyst is less than 200: 1.

The present disclosure relates to a method for preparing a Ziegler-Natta catalyst for polymerization of linear low-density polyethylene (LLDPE), and specifically, the method for preparing a Ziegler-Natta catalyst for polymerization of linear low-density polyethylene according to an embodiment includes preparing a magnesium chloride support containing magnesium chloride alcoholate obtained by mixing an excessive amount of alcohol with magnesium chloride. In the method for preparing a Ziegler-Natta catalyst according to an embodiment, a catalyst composition is easily controlled, such that it is possible to effectively produce linear low-density polyethylene having various physical properties and excellent copolymerization performance.

The invention provides a silicon-magnesium composite Ziegler-Natta catalyst precursor and a preparation method thereof, silica gel is subjected to pore expansion by using a hydrothermal method, then high-temperature activation is performed to obtain silica microspheres with good morphology and pore structure, and then the silica microspheres are impregnated with soluble magnesium salt to carry out magnesium source loading to obtain the silicon-magnesium composite Ziegler-Natta catalyst precursor. And finally, the silicon-magnesium composite Ziegler-Natta catalyst precursor is obtained, and the defects of the existing preparation technology in morphology perfection and particle size uniformity are successfully overcome. The precursor prepared by the method is more perfect in morphology, more uniform in particle size and better in magnesium loading effect.

The present disclosure relates to a method for manufacturing a Ziegler-Natta catalyst for use in low-density copolymerization, specifically to a manufacturing method including a step of reacting an alkylaluminum compound under a branched-chain alkyl alcohol or cycloalkyl alcohol solvent to produce a magnesium carrier. The Ziegler-Natta catalyst produced by the manufacturing method according to one embodiment has excellent catalytic activity. Therefore, by using it, it is possible to realize various physical properties and effectively manufacture a low-density copolymer with excellent copolymerization performance.

The present disclosure relates to a process for obtaining a Zeigler Natta catalyst having a particle size distribution with a span difference of less than one. The process is simple and there is no requirement for stringent control on raw material or catalyst synthesis process. The obtained catalyst fractions are used in different polymerization technology and hence there is no generation of waste.

A catalyst can include a solid reaction product of: a non-halide containing organic compound (A) having an element from Groups la, Ila, lIb, Illb, IVb, VIla, and VIII; a non-halide containing transition metal compound (B) having a transition metal from Groups IVa, Va, and Via; and an organo-aluminum halide represented by AlR(R') n, where R represents a C1-C20 hydrocarbon radical, R' represents a halide, and n represents 0 ≤ n ≤ 2. The disclosure also relates to methods of preparing the catalyst.

A catalyst can include a solid reaction product of: a non-halide containing organic compound (A) having an element from Groups Ia, IIa, IIb, IIIb, IVb, VIIa, and VIII; a non-halide containing transition metal compound (B) having a transition metal from Groups IVa, Va, and Via; and an organo-aluminum halide represented by AlR(R′)n, where R represents a C1-C20 hydrocarbon radical, R′ represents a halide, and n represents 0≤n≤2. The disclosure also relates to methods of preparing the catalyst.

A Ziegler-Natta catalyst for olefin polymerization, a process for preparing a polyolefin, and a polyolefin resin are provided. A Ziegler-Natta catalyst includes: (i) a Ziegler-Natta procatalyst for olefin polymerization including a titanium compound represented by Formula 1, a magnesium compound represented by Formula 2, and an internal electron donor; (ii) an organo-aluminum compound represented by formula 7; and (iii) an external electron donor represented by Formula 3 wherein the internal electron donor comprises a mixture of a first internal electron donor represented by Formula 4, a second internal electron donor represented by Formula 5, and a third internal electron donor represented by Formula 6, a molar ratio of the external electron donor to the mixture being 115 to 130.

Disclosed herein are a Ziegler-Natta catalyst for olefin polymerization and a method for preparing a polyolefin having good processability using the same, in which the Ziegler-Natta catalyst for olefin polymerization includes at least one external electron donor satisfying a specific formula based on an alkoxysilane (silicate ester) as a matrix, the number of active sites of the titanium compound is increased, thereby making it possible to prepare a polyolefin having good processability.

The present invention relates to tetrahydrofurfuryl derivatives and more particularly to their use as internal electron donors in Ziegler-Natta catalysts to obtain polymers with desirable properties. The present disclosure further concerns Ziegler-Natta catalyst components comprising said tetrahydrofurfuryl derivatives and Ziegler-Natta catalysts for olefin polymerization comprising said Ziegler-Natta catalyst components, as well as a method for preparing the same and their use in providing polyolefins.