A process for preparing a catalyst component made from or containing Mg, Ti, and at least an electron donor compound (ID), including the steps of: (a) reacting a Mg based compound with a Ti compound, having at least a Ti—Cl bond, in an amount such that the Ti/Mg molar ratio is greater than 3 and at a temperature ranging from 0 to 150° C., thereby yielding an intermediate solid catalyst component containing Mg and Ti; and (b) contacting the intermediate solid catalyst component with a gaseous stream containing the electron donor compound (ID) in a gaseous dispersing medium, thereby yielding a final solid catalyst component having an ID/Ti molar ratio ranging from 0.5:1 to 20:1.

A process for preparing a catalyst component made from or containing Mg, Ti, and at least an electron donor compound (ID), including the steps of: (a) reacting a Mg based compound with a Ti compound, having at least a Ti—Cl bond, in an amount such that the Ti/Mg molar ratio is greater than 3 and at a temperature ranging from 0 to 150° C., thereby yielding an intermediate solid catalyst component containing Mg and Ti; and (b) contacting the intermediate solid catalyst component with a gaseous stream containing the electron donor compound (ID) in a gaseous dispersing medium, thereby yielding a final solid catalyst component having an ID/Ti molar ratio ranging from 0.5:1 to 20:1.

The present disclosure relates to the technical field of preparation of syndiotactic 1,2-polybutadiene (s-PB), in particular to a catalytic system and use thereof, and a preparation method of s-PB. In the present disclosure, the catalytic system includes an iron-containing organic compound, an azodicyano compound, an organoaluminum compound, and a free radical scavenger; where an iron element in the iron-containing organic compound, the azodicyano compound, the organoaluminum compound, and the free radical scavenger have a molar ratio of 1:(0.5-10):(5-100):(1-1000); and the free radical scavenger is selected from the group consisting of a sterically hindered phenol, a sterically hindered amine, and a phosphorus-containing antioxidant. The catalytic system can prepare the s-PB with a high activity at a high temperature, and the s-PB has a melting point of 60° C. to 130° C. with an extremely low gel content or even no gelation.

The present disclosure relates to the technical field of preparation of syndiotactic 1,2-polybutadiene (s-PB), in particular to a catalytic system and use thereof, and a preparation method of s-PB. In the present disclosure, the catalytic system includes an iron-containing organic compound, an azodicyano compound, an organoaluminum compound, and a free radical scavenger; where an iron element in the iron-containing organic compound, the azodicyano compound, the organoaluminum compound, and the free radical scavenger have a molar ratio of 1:(0.5-10):(5-100):(1-1000); and the free radical scavenger is selected from the group consisting of a sterically hindered phenol, a sterically hindered amine, and a phosphorus-containing antioxidant. The catalytic system can prepare the s-PB with a high activity at a high temperature, and the s-PB has a melting point of 60° C. to 130° C. with an extremely low gel content or even no gelation.

Provided is an olefin polymerization catalyst carrier with a general structure formula of Mg(OR.sup.I).sub.n(OR.sup.II).sub.2-n, wherein: 0≦n≦2, and R.sup.I and R.sup.II can be the same or different and are each independently selected from a C.sub.1-C.sub.20 hydrocarbon group. In the X-ray diffraction pattern of the catalyst carrier, there are a set of diffraction peaks in the range of a 2θ diffraction angle of 5°-15°, and the set of diffraction peaks contain 1-4 main diffraction peaks. Also disclosed is an olefin polymerization solid catalyst component which is prepared from the carrier Mg(OR.sup.I).sub.n(OR.sup.II).sub.2-n, a titanium compound, and at least one electron donor compound. In addition, also disclosed is an olefin polymerization catalyst containing the solid catalyst component, at least one organic aluminum compound, and optionally, an external electron donor compound.

This disclosure is to provide a method for preparing a terminal-modified conjugated diene polymer which achieves an extremely high compounding amount of cis-1,4 without complicated preparing conditions, a terminal-modified conjugated diene polymer obtained via the method, a rubber composition containing the terminal-modified conjugated diene polymer, and a tire using the rubber composition. This disclosure is A method for preparing a terminal-modified conjugated diene polymer comprising: polymerizing a conjugated diene compound by using a polymerization catalyst composition and modifying a polymer obtained via the polymerization by using a modifier, wherein the polymerization catalyst composition contains a rare earth element compound, and a coordination compound having a cyclopentadiene skeleton selected from substituted or unsubstituted cyclopentadienes, substituted or unsubstituted indenes, and substituted or unsubstituted fluorenes, and wherein the polymerization and modification is performed in a one-pot way.

The purpose of the present invention is to provide a method for efficiently producing an olefin (co)polymer containing a constituent unit derived from 1-butene, the (co)polymer having a molecular weight that is sufficiently high even for high temperature conditions that are beneficial for industrial production methods. This purpose can be achieved by means of a method for producing an olefin (co)polymer containing a constituent unit derived from 1-butene, wherein at least 1-butene and, if necessary, an α-olefin having 2 or more carbon atoms (excluding 1-butene) and other monomers are (co)polymerized in the presence of an olefin polymerization catalyst that contains (A) a crosslinked metallocene compound represented by general formula [I] and (B) at least one type of compound selected from among (b-1) an organic aluminum oxy compound, (b-2) a compound that forms an ion pair upon a reaction with the crosslinked metallocene compound (A), and (b-3) an organic aluminum compound, at a polymerization temperature of 55-200° C. and a polymerization pressure of 0.1-5.0 MPaG.

The present invention relates to a compound represented by the chemical formula 1, a catalyst system for olefin oligomerization comprising the same, and a method for oligomerizign olefins using the same, and the catalyst system for olefin oligomerization according to the present invention has excellent catalytic activity as well as high selectivity for 1-hexene or 1-octene, thereby enabling more efficient preparation of alpha-olefins.

The present invention relates to a method for purifying a polyalkylaluminoxane-containing solution using a hydroxy group-containing compound, a method for producing a catalyst composition using the method, a catalyst composition produced by the production method, and a method for producing an olefin polymer using the catalyst composition.

The present disclosure provides methods for producing an olefin polymer by contacting a C.sub.3-C.sub.40 olefin and ethylene with a catalyst system including an activator and a metallocene catalyst compound comprising a substituted or unsubstituted tetrahydro-s-indacenyl group and obtaining a C.sub.3-C.sub.40 olefin-ethylene copolymer typically comprising from 0.5 to 43 wt % ethylene, and from 99.5 to 57 wt % C.sub.3 to C.sub.40 comonomer wherein the Tg of the terpolymer is from 0 to −60° C.