7 results about "Ziegler–Natta catalyst" patented technology

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 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.

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.

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.

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.

The Ziegler-Natta catalyst for ethylene polymerization not only contains a Ziegler-Natta Pro-catalyst containing internal electron donors satisfying a specific formula, but also includes at least one additional external electron donor satisfying a specific formula, thereby increasing the number of active sites of the titanium compound. In the case of polyethylene produced from the Ziegler-Natta catalyst for ethylene polymerization, the high MFR ratio results in excellent processability and improved productivity of polyethylene resin.