The present disclosure relates to a solid catalyst component for the (co)polymerization of olefins CH.sub.2?CHR, in which R is hydrogen or a hydrocarbyl radical with 1-12 carbon atoms, comprising Ti, Mg, and Cl, and optionally an electron donor compound selected from the group consisting of ethers, amines, silanes, carbamates ketones, esters of aliphatic acids, alkyl and aryl esters of optionally substituted aromatic polycarboxylic acids, diol derivatives chosen among monoesters monocarbamates and monoesters monocarbonates or mixtures thereof, comprising from 0.1 to 50% wt of Bi with respect to the total weight of the solid catalyst component.

Disclosed is a method of preparing a rare-earth alkyl phosphate solution, the method including step (a) of preparing an alkyl phosphate amine salt solution by reacting an organic amine with an alkyl phosphate in a first solvent; step (b) of preparing a rare-earth metal salt solution by reacting a rare-earth metal oxide with an acid in the second solvent; and step (c) of mixing and reacting the alkyl phosphate amine salt solution with the rare-earth metal salt solution.

The present invention provides a metallocene supported catalyst that can prepare a polyolefin having excellent transparency even when processed into a film, as well as excellent processibility and mechanical properties, with high catalytic activity, and a method for preparing a polyolefin using the same.

The instant invention provides a method for polymerizing one or more ethylene-based polymers. The method for polymerizing one or more ethylene-based polymers according to the present invention comprises the following steps: (1) selecting ethylene and optionally one or more alpha-olefin comonomers; (2) selecting one or more catalyst systems comprising one or more procatalysts comprising Ti, one or more cocatalysts comprising Al, and one or more self-limiting agents (SLA); wherein the ratio of SLA to Ti is from 5:1 to 40:1 and the ratio of Al to SLA is from 2:1 to 40:1; (3) polymerizing said ethylene and optionally one or more alpha-olefin comonomers in the presence of said one or more catalyst systems via a slurry polymerization process or gas-phase polymerization process in one or more reactors; (4) thereby producing one or more ethylene; wherein said catalyst system has a loss of least 85% of catalyst productivity when the temperature is increased from 85 to 115 C.

Disclosed is a method of preparing a rare-earth alkyl phosphate solution, the method including step (a) of preparing an alkyl phosphate amine salt solution by reacting an organic amine with an alkyl phosphate in a first solvent; step (b) of preparing a rare-earth metal salt solution by reacting a rare-earth metal oxide with an acid in the second solvent; and step (c) of mixing and reacting the alkyl phosphate amine salt solution with the rare-earth metal salt solution.

A process for precision polymerization is described using a system of a Lewis acid, a Lewis base and a Michael-type monomer that can form a frustrated triple, wherein a Michael-type monomer, optionally dissolved in an organic solvent, is reached with a Lewis acid to form at least one zwitterionic type complex, a Lewis base is added to form a frustrated triple with the zwitterionic type complex which initiates the polymerization reaction, and the reaction is continued to form a polymer.

A process for precision polymerization is described using a system of a Lewis acid, a Lewis base and a Michael-type monomer that can form a frustrated triple, wherein a Michael-type monomer, optionally dissolved in an organic solvent, is reached with a Lewis acid to form at least one zwitterionic type complex, a Lewis base is added to form a frustrated triple with the zwitterionic type complex which initiates the polymerization reaction, and the reaction is continued to form a polymer.

To produce an olefin-based polymer having a minor amount of decrease in bulk density due to heat. A solid catalyst component for olefin polymerization containing a titanium atom, a magnesium atom, a halogen atom, and an internal electron donor, and having an envelope E1 calculated by the following Formula (1) in a range of 0.810 to 0.920.
E1=LE1/LS1(1) (In Formula, LE1 is a convex hull perimeter of the solid catalyst component for olefin polymerization obtained from an image of the solid catalyst component for olefin polymerization captured with a scanning electron microscope, and LS1 is an actual perimeter of the solid catalyst component for olefin polymerization obtained from the image of the solid catalyst component for olefin polymerization captured with the scanning electron microscope.)

To produce an olefin-based polymer having a minor amount of decrease in bulk density due to heat. A solid catalyst component for olefin polymerization containing a titanium atom, a magnesium atom, a halogen atom, and an internal electron donor, and having an envelope E1 calculated by the following Formula (1) in a range of 0.810 to 0.920.
E1=LE1/LS1(1) (In Formula, LE1 is a convex hull perimeter of the solid catalyst component for olefin polymerization obtained from an image of the solid catalyst component for olefin polymerization captured with a scanning electron microscope, and LS1 is an actual perimeter of the solid catalyst component for olefin polymerization obtained from the image of the solid catalyst component for olefin polymerization captured with the scanning electron microscope.)

A method of curing a free-radically polymerizable composition includes contacting a curable composition with at least one metal oxide selected from the group consisting of magnesium oxide, ferrous metal oxides, aluminum oxide, nickel oxide, silver oxide, and combinations thereof. The curable composition includes: free-radically polymerizable compound; and a beta-dicarbonyl compound represented by the formula (I) or a salt thereof, wherein: X.sup.1 and X.sup.2 independently represent a covalent bond, wherein each R.sup.4 independently represents H or alkyl having from 1 to 18 carbon atoms; R.sup.1 and R.sup.2 independently represent a hydrocarbyl or substituted-hydrocarbyl group having from 1 to 18 carbon atoms, and R.sup.3 represents hydrogen, or a hydrocarbyl or substituted-hydrocarbyl group having from 1 to 18 carbon atoms, or taken together any two of R.sup.1, R.sup.2, or R.sup.3 form a five-membered or six-membered ring; an organic peroxide; and a quaternary ammonium halide. Articles including the cured compositions are also disclosed.

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