148results about How to "High stereoregularity" patented technology

An alkylene and/or silylene bridged binuclear metallocene catalyst for styrene polymerization is represented by the following formula (I): where M1 and M2 are the same or different transition metal of Group IVb of the Periodic Table; Cp1 and Cp2 are the same or different cyclopentadienyl; alkyl, alkoxy, silyl or halogen substituted cyclopentadienyl; indenyl; alkyl, alkoxy, silyl or halogen substituted indenyl; fluorenyl; or alkyl, alkoxy, silyl or halogen substituted fluorenyl, which is capable of pi -electron, eta 5-bonding with M1 or M2; each of E1, E2 and E3, independently of one another, is a carbon atom or a silicon atom; m, p and q are integers of 0 to 15 and m+p+q>/=1; each of R1, R2, R3, R4, R5 and R6, independently of one another, is a hydrogen, an alkyl, an aryl, an alkoxy or a halogen; X is a hydrogen, an alkyl, an alkoxy or a halogen; and n is 3. M1 and M2 may also be in cardin form by mixture of (I) with a compound which abstructs an X gray from each metal atom and substitution then with non-coordinating anions.

Disclosed are a propylene block copolymer containing a crystalline polypropylene portion having a high crystallinity of a boiled heptane-insoluble component contained therein, a high stereoregularity and an extremely long mesochain, and a process for preparing said copolymer. Further disclosed is a propylene polymer composition comprising the above propylene block copolymer and at least one stabilizer selected from a phenol type stabilizer, an organophosphite type stabilizer, a thioether type stabilizer, a hindered amine type stabilizer and a metallic salt of higher aliphatic acid. The propylene block polymer of the invention is well-balanced between rigidity, heat resistance and moisture resistance, and can be favorably used for sheet, filament, injection molded product, blow molded product, etc. The propylene polymer composition of the invention has excellent properties of the propylene polymer or the propylene block copolymer, and moreover is excellent in heat stability during the molding stage, long-term heat stability and weathering resistance.

Chiral auxiliaries useful for efficiently producing a phosphorus atom-modified nucleic acid derivative with high stereoregularity, and compounds represented by the following the general formula (I) or the general formula (XI) for introducing the chiral auxiliaries.

The invention relates to polymerization of 1-butene, in particular to a spherical catalyst of polybutylene-1. The catalyst consists of a carrier, an active component and a modifier, wherein the active component is titanium tetrachloride, the carrier is a magnesium chloride spherical carrier and the modifier is an electron donor compound; and the catalyst comprises the major components in percentage by mass of: 1.1-4.5% of Ti and 0.15-12.37% of electron donors. The spherical catalyst suitable for butane-1 polymerization solves the problems that the activity of the general catalyst is low, the normality of polymer is difficult to control, and the molecular weight of the polymer and the molecular weight distribution are difficult to control. The obtained polybutylene polymer has very high steric regularity, the normality of polybutylene is as high as 99%, the crystallinity of the polybutylene-1 polymer is greater than 60% and the fusion point is 130.5 DEG C. The invention can simplify the polymerizing process and save the production cost.

The invention relates to a catalyst component used for olefin polymerization and a preparation method thereof as well as a catalyst used for olefin polymerization and application. The catalyst component comprises reaction products of the following components: (1) a solid component and (2) at least one titanium compound, wherein the solid component comprises a magnesium compound shown in Formula (1) (shown in the description) and epoxy alkanes compounds shown in Formula (2) (shown in the description); R1 is linear alkyls or branched alkyls with C1-C12; R2 is the same as or different from R3; R2 and R3 are hydrogen, or linear alkyls or branched alkyls with C1-C5 independently; hydrogen on alkyls is optionally replaced by halogen; X is halogen, m ranges from 0.1 to 1.9, n ranges from 0.1 to 1.9, and m plus n is equal to 2. By adopting the catalyst component in the process of olefin polymerization, relatively high polymerization activity and relatively high stereotactic capability can be acquired.

A propylene polymeric composition with elastic character that is soluble in at least one nonpolar organic solvent selected from the group consisting of toluene, xylene, heptane, and hexane, comprises greater than 3 weight percent and up to 45 weight percent homotactic sequences each having only r or m diads, all of which homotactic sequences have a helical length in the range of 20 to 150Å, and in the range of 55 to 97 weight percent of the sum of homotactic sequences of less than 20Å in helical length, each homotactic sequence having only r or m diads and having fewer than 10 repeat units with mmmm pentads being present in the range of 0 to 35 weight percent of the total composition, and heterotactic sequences having r and m diads of unequal number, the polymer having a molecular weight (Mw) of at least 70,000.

A solid catalyst component for α-olefin polymerization, which comprises a titanium atom, a magnesium atom, a halogen atom, a phthalic acid ester compound, and a 1,3-diether compound, wherein an amount of the 1,3-diether compound contained in the solid catalyst component is 0.1 to 3 mol per one mol of the phthalic acid ester compound contained therein; a process for producing a catalyst for α-olefin polymerization, which comprises the step of contacting at least the above solid catalyst component, an organoaluminum compound, and an external electron donor compound with one another; and a process for producing an α-olefin polymer, which comprises the step of homopolymerizing or copolymerizing an α-olefin in the presence of a catalyst produced by the above process.

The present invention relates to a polymerization process for preparing syndiotactic polystyrenes, which comprises a step of microfluidizing in a microfluidization apparatus both a catalyst mixture consisting of a styrene monomer, a metallocene catalyst and an inert organic solvent and a cocatalyst mixture consisting of a styrene monomer, a cocatalyst and an inert organic solvent, and a step of reacting the microfluidized mixture with a catalyst and a cocatalyst in a reactor. The metallocene catalyst has a bridged structure of a complex of Group IV transition metals such as Ti, Zr, Hf etc. in the Periodic Table and a ligand having one or two cycloalkane dienyl groups such as cyclopentadienyl group, indenyl groups, fluorenyl group, and derivatives thereof. The reactor is a well stirred reactor equipped with agitating blades therein to mix the reactants well. In this invention, the plural number of reactors can be employed in series for more effective polymerization, and the plural number of microfluidization apparatuses can be employed in parallel.

The invention relates to a supported catalyst of olefin polymer, which uses 1, 4-dialkyl compound with two cyclic structures in molecular skeleton as internal electron donor compound, to obtain large spatial volume, while the inventive supported catalyst has high catalytic activity for catalyzing propone polymerization. While assisted with promoter and external electron donor, and the product polypropylene has high stereoregularity. The invention further discloses a preparation method of supported catalyst.

The present invention relates to a preparation method of solid titanium catalyst for olefin polymerization comprising the steps of: 1) preparing a magnesium compound solution by dissolving a magnesium halide compound into a mixed solvent of a cyclic ether and one or more of alcohol; (2) preparing a carrier by, adding a mixture of titanium compound and halogenated hydrocarbon to the magnesium compound solution at low temperature and then elevating the temperature of the resulted solution for reaction; and (3) preparing a solid titanium catalyst by reacting the carrier with a titanium compound and an electron donor.

A catalyst for polymerization of olefins and a process for producing an olefin polymer or copolymer are disclosed. The catalyst comprises (a) a solid catalyst component obtained by causing an organosilicon compound (b) represented by the formula, [CH₂═CH—(CH₂)_n]_qSiR³_4-q, and an organoaluminum compound to come in contact with a solid component comprising magnesium, titanium, halogen, and an electron donor compound, or a solid catalyst component obtained by causing a magnesium compound, two types of titanium compounds, an electron donor compound, and an organosilicon compound to come in contact with each other, and (B) an organoaluminum compound. The process for producing an olefin polymer or copolymer comprises polymerizing olefins in the presence of the catalyst. The catalyst has a high catalytic activity, exhibits excellent hydrogen response, and can produce polymers with high stereoregularity and a broad molecular weight distribution at a high yield.

A catalyst having a high catalyst activity, which enables the production of an α-olefin polymer improved in stereoregularity by decreasing an amorphous component, and a production method for the α-olefin polymer, are developed. Described are a catalyst for polymerizing α-olefin comprising a combination of (A) a solid catalyst component containing magnesium, titanium and a halogen as an essential component, which may contain if necessary, a silicon compound, an organoaluminum compound, and an electron donor; (B) an organoaluminum compound; and (C) a compound containing a C(═O)N bond such as an amide or an urea; which may further contain if necessary, (D) a silicon compound or a diether compound; and a production method for an α-olefin polymer using the same.

The invention relates to a dialkoxyl magnesium carrier, which is a product produced by a reflux reaction of magnesium, an alcohol and mixed halogenated agents under an inert atmosphere. The mixed halogenated agents are iodine and magnesium chloride, and the weight ratio between iodine and magnesium chloride is 0.05:1-1:0.01. The dialkoxyl magnesium carrier is spheroid with uniform particle size distribution, excellent particle morphology and high bulk density. A solid catalyst component and a catalyst based on this carrier for olefin polymerization are also provided, and olefin polymers having a wide molecular weight distribution, good stereoregularity, excellent particle morphology and a low content of fine powders can be obtained.