100results about How to "High isotacticity" patented technology

The present invention discloses catalyst for high temperature olefin polymerization and its preparation process and use. The catalyst includes: supported Ziegler-Natta catalyst of titanium halide compound and organic electron donor compound supported with MgCl2 alcoholate carrier; aluminoxane prepared with trialkyl aluminum and water; and one kind of organic electron donor, such as organosilicon compound R2Si(OCH3)2, where R is phenyl, isopropyl, isobutyl or cyclopentyl. The said catalyst can catalyze propylene polymerizing reaction at 50-120 deg.c in excellent catalytic activity, and the prepared polymer has isotactivity index of 85-99 %, number average molecular weight of 43000-104000 g / mol, molecular weight distribution index of 4.5-10.6.

New ligands, compositions, metal-ligand complexes and arrays with pyridyl-amine ligands are disclosed that catalyze the polymerization of monomers into polymers. Certain of these catalysts with hafnium metal centers have high performance characteristics, including higher comonomer incorporation into ethylene / olefin copolymers, where such olefins are for example, 1-octene, isobutylene or styrene. Certain of the catalysts are particularly effective at polymerizing propylene to high molecular weight isotactic polypropylene in a solution process at a variety of polymerization conditions.

The invention relates to an olefin polymerization catalyst for the polymerization of alkene, in particular to the polymerization of propylene, or copolymerization, and a process for preparation, the invention relates to a catalytic activity component which is prepared by novel ester ether compound, and catalyst composition which contains the catalytic activity component, and a process for preparation. The catalytic activity component takes magnesium chloride to be carrier, a noevl binary ether ester compound which is showed as the general formula I is added in the process for preparation, the catalyst composition which contains catalytic activity component not only has higher catalytic activity and hydrogen sensitivity, meanwhile can guarantee polyacrylic resin to have higher stereoregularity when the composition is used for propylene polymerization. And the integrity of the polymerisate is better.

The present invention relates to a solid, particulate catalyst component having an mean particle size range of 5 to 200 μm and comprising a compound of a Group 2 metal, a compound of a transition metal of Group 4 to 6, and at least two internal electron donors being different to each other and being non-phthalic organic compounds selected from (di)esters of non-phthalic carboxylic (di)acids, 1,3-diethers and di-esters of 1,3-diol compounds and derivatives thereof, and wherein the solid particulate catalyst component is free of any external support material. The invention relates also to the preparation of the catalyst component and a polymerization process for producing propylene polymers.

The invention discloses a preparation method of a low-normal-hexane-dissolution transparent polypropylene material. The preparation method comprises the following steps of (1) polymerizing propylene and a comonomer of 1-butylene in a loop reactor in the presence of catalysts, promoter, electron donors and antistatic agent at a reaction temperature of 69-71 DEG C, a reaction pressure of 3.4-3.8 MPa, a hydrogen concentration of 2500-2700 ppm and a 1-butylene concentration of 4%-6% to obtain propylene-butylene polypropylene random copolymer resin; (2) uniformly mixing the propylene-butylene polypropylene random copolymer resin, transparent reagent, primary antioxidants, secondary antioxidants and halogen absorber at normal pressure and temperature, feeding the mixture into an extruder for extruding granulation, cooling granulated materials in cooling water to obtain the low-normal-hexane-dissolution transparent polypropylene material. The prepared low-normal-hexane-dissolution transparent polypropylene material is good in machining performance, transparency and rigidity and tenacity balance and low in normal hexane dissolution and obtains optimal comprehensive properties such as optical properties, mechanical properties and food safety, thereby meeting the requirements of the markets of the fields of food packaging and medicine on transparent polypropylene.

The invention relates to a polyacrylonitrile copolymer spinning liquid and a preparation method thereof, wherein the polyacrylonitrile copolymer spinning liquid is high in isotacticity, and the distribution of copolymer units is uniform. According to the preparation method, bifunctional monomer itaconic acid monoester or itaconic acid monoamide is selected, wherein the reactivity ratio of bifunctional monomer itaconic acid monoester or itaconic acid monoamide is close to the reactivity ratio of acrylonitrile; and binary copolymerization is completed in a tubular reactor provided with a static mixer component, so that the isotacticity of acrylonitrile units in the polyacrylonitrile copolymer spinning liquid is increased effectively, formation sequence distribution of the copolymer units in the polyacrylonitrile copolymer spinning liquid is stabilized, and the process of polymerization is controlled smoothly. The isotacticity of the acrylonitrile units in the polyacrylonitrile copolymer spinning liquid is 28 to 35%, dynmaic viscosity is 200 to 800Pa.S, and molecular weight distribution is 1.5 to 2.2.

Group 4 metal complexes comprising a polyvalent, heteroaryl donor ligand and their use as components of olefin polymerization catalysts, especially suited for preparing propylene / ethylene copolymer products having high isotacticity and low molecular weight, are disclosed.

The invention relates to the field of olefin polymerization catalysts, and discloses a catalyst for olefin polymerization, wherein the catalyst comprises a catalyst precursor and a polymer with a structural unit represented by a formula (IV), the catalyst precursor contains an alkoxy magnesium carrier represented by a formula (I), an electron donor compound represented by a formula (II), a titanium compound represented by a formula (III) and an organic aluminum compound represented by a formula (V), and the catalyst precursor is coated with the polymer with the structural unit represented by the formula (IV). According to the invention, the catalyst is uniform in particle size distribution; the catalyst component containing the catalyst has the characteristics of high activity and low finepowder content when applied to olefin polymerization, and further has characteristics of less activity attenuation under a normal-temperature storage condition, high isotacticity of a polymer, reduced fine powder content in polymer powder and high stacking density; and the formula (1) is Mg(OEt)2-m(OEHA)m, the formula (II) is defined in the specification, the formula (III) is TiXn(OR<7>)4-n, theformula (IV) is -CH2CHR<8>-, and the formula (V) is AlR<9>nY3-n.