127results about How to "High stereospecificity" patented technology

The present invention provides a solid catalyst component for the polymerization of olefins, comprising magnesium, titanium, a halogen and an electron donor, wherein said electron donor comprises at least one selected from the group consisting of ester of polyol of the formula (I):R1CO—O—CR3R4—A—CR5R6—O—CO—R2  (I)wherein, R1 and R2 groups, which may be identical or different, can be substituted or unsubstituted hydrocarbyl having 1 to 20 carbon atoms, R3-R6 groups, which may be identical or different, can be selected from the group consisting of hydrogen, halogen or substituted or unsubstituted hydrocarbyl having 1 to 20 carbon atoms, R1-R6 groups optionally contain one or more hetero-atoms replacing carbon, hydrogen atom or the both, said hetero-atom is selected from the group consisting of nitrogen, oxygen, sulfur, silicon, phosphorus and halogen atom, two or more of R3-R6 groups can be linked to form saturated or unsaturated monocyclic or polycyclic ring A is a single bond or bivalent linking group with chain length between two free radicals being 1-10 atoms, wherein said bivalent linking group is selected from the group consisting of aliphatic, alicyclic and aromatic bivalent radicals, and can carry C1-C20 linear or branched substituents one or more of carbon atom and / or hydrogen atom on above-mentioned bivalent linking group and substituents can be replaced by a hetero-atom selected from the group consisting of nitrogen, oxygen, sulfur, silicon, phosphorus, and halogen atom, and two or more said substituents on the linking group as well as above-mentioned R3-R6 groups can be linked to form saturated or unsaturated monocyclic or polycyclic ring.

The present invention provides one kind catalyst component for CH2=CHR olifine polymerization, where R is H or alkyl radical or aryl radical of C1-C6. The catalyst component contains Mg, Ti, halogen and electron donor.

A catalyst used for olifin polymerizing reaction CH2=CHR, where R is hydrogen or C1-C6 alkyl or aryl, contains Mg, Ti, halogen and electron doner which may be at least one dialkoxide compound.

This invention relates to a catalyst component for alkene polymerization and its catalyst, and magnesium chloride-silica gel composite gel is adopted for this component. By introducing diol ester compounds which have a common formula (I) in the preparation of the catalyst component, the catalytic activity can be promoted. When the catalyst component in this invention is used in propylene polymerization, the obtained polymer has higher apparent density, narrower particle size distribution, high isotacticity, wide molecular weight distribution and outstanding comprehensive properties.

The invention provides a spherical magnesium halide adduct and a preparation method thereof, and application of the spherical magnesium halide adduct to preparation of an olefin polymerization catalyst. The spherical magnesium halide adduct is shown as MgXY-mR(OH)r-nE and has a good particle shape, special-shaped materials do not exist, and particles are not adhered. The olefin polymerization catalyst prepared by taking the spherical magnesium halide adduct as a carrier has high hydrogen regulation sensitivity and stereospecificity when used for olefin (particularly propylene) polymerization.

The invention relates to the field of olefin polymerization, and particularly provides polypropylene, a preparation method and applications thereof, wherein the polypropylene has a melt flow index MFRof more than 30 g / 10 min, has an isotactic index of 96-99.5 wt%, and has a molecular weight distribution index MW / Mn of 3-5.5. The preparation method comprises: polymerizing propylene in the presenceof a catalyst under an olefin polymerization condition to obtain a polypropylene product, wherein the catalyst contains a catalyst component, an alkyl aluminum compound, and optionally an external electron donor, the catalyst component contains the product obtained by carrying out a reaction on a magnesium source, a titanium source and an internal electron donor, the internal electron donor contains a phosphate compound and a diether compound, and the phosphorus content (calculated as the phosphorus element) in the catalyst component is not more than 0.06 wt%. According to the present invention, the polypropylene integrates characteristics of high isotactic index, high melt flow index and narrow molecular weight distribution.

A modified Ziegler-Natta catalyst system comprising a titanium or vanadium compound, a magnesium compound, a carbene donor, and an aluminum compound is disclosed. The invention includes a process which comprises polymerizing an alpha-olefin in the presence of the carbene-modified Ziegler-Natta catalyst system. The carbene donor may be used as either an internal or external donor. The use of carbene donors in Ziegler-Natta catalyzed olefin polymerizations should improve catalyst activity and / or stereospecificity.

The present disclosure relates to the preparation of a cannabidiol compound or a derivative thereof. The cannabidiol compound or derivatives thereof can be prepared by an acid-catalyzed reaction of a suitably selected and substituted di-halo-olivetol or derivative thereof with a suitably selected and substituted cyclic alkene to produce a dihalo-cannabidiol compound or derivative thereof. The dihalo-cannabidiol compound or derivative thereof can be produced in high yield, high stereospecificity, or both. It can then be converted under reducing conditions to a cannabidiol compound or derivatives thereof.

The invention provides a catalytic system containing phosphate external electron donors for polypropylene polymerization. The catalytic system is prepared from a solid catalyst component (A), alkyl aluminum (B) and a multicomponent external electron donor (C), wherein the component (A) is a magnesium halide-supported Ti solid component and contains diester internal electron donors, diether internal electron donors or a combination of the donors; the component (C) comprises a first type of external electron donors and a second type of external electron donors; the first type of the external electron donors are silane which at least contains one alkoxy of C1 to C10; the second type of the external electron donors are selected from one or more of phosphate compounds or phosphonate compounds. When the catalytic system is used for olefin polymerization, the catalytic system can realize the characteristic of inhibiting high-temperature activity of a catalyst; in addition, the effect of the catalytic system is no-less-favorable than a temperature control effect of fatty acid ester compounds in the prior art.

The present disclosure relates to the preparation of a cannabidiol compound or a derivative thereof. The cannabidiol compound or derivatives thereof can be prepared by an acid-catalyzed reaction of a suitably selected and substituted di-halo-olivetol or derivative thereof with a suitably selected and substituted cyclic alkene to produce a dihalo-cannabidiol compound or derivative thereof. The dihalo-cannabidiol compound or derivative thereof can be produced in high yield, high stereospecificity, or both. It can then be converted under reducing conditions to a cannabidiol compound or derivatives thereof.

The present invention is to provide a composite carrier, which is spheric particles obtainable by contacting magnesium halide with one or more electron donor compounds to form a solution, then mixing the solution with silica material having an average particle size of less than 10 microns to form a mixture, and drying the mixture through spray drying process. The present invention is also to provide a catalyst component comprising said composite carrier. When the catalyst component is used together with a cocatalyst component in propylene polymerization, it exhibits higher polymerization activity and stereospecificity, and can be used to prepare high impact resistent ethylene-propylene copolymer having high ethylene content.