Abstract:
Isotactic index improvement is achieved for C 3 and higher alpha olefins in systems containing a catalyst component comprising titanium supported on a magnesium halide support. The titanium component is formed by copulverizing the magnesium halide with one or more electron donorsfollowed bytreatmentwith liquidtitanium halide. The improvement is achieved by using a dialkylaluminum alkyl phenoxide component with the trialkylaluminum co- catalyst normally used. In slurry polymerizations, the isotactic index of the polymer has been improved. It is possible to achieve a variable melt flow index for polypropylene while maintaining good isotactic index. Isotactic index is retained at high levels even though the temperature and/or time of polymerization is varied.
Abstract:
An unmilled catalytic component for polymerizing olefins with high activity to yield polymers with high stereoregularity and a narrow particle size distribution with a low weight percentage of small particles comprises a solid, unmilled support containing magnesium-halogen bonds, a transition metal halide of a metal selected from Groups IVB and VB of the periodic table, and electron donors. This catalytic component is obtained by steps comprising:
(a) contacting a Mg(OR) 2 and/or Mn(OR) 2 compound with a Ti(OR) 4 compound to comprise a liquid, where R is a hydrocarbyl or halogenated hydrocarbyl moiety containing 1 to 20 carbon atoms or a halogen, (b) reacting the liquid with a fluid comprising a halogenating agent and treatment with an electron donor to form a treated solid, and (c) post-treating the solid with a transition metal halide.
Abstract:
Isotactic index improvement is achieved for C 3 and higher alpha olefins in systems containing a catalyst component comprising titanium supported on a magnesium halide support. The titanium component is formed by copulverizing the magnesium halide with one or more electron donorsfollowed bytreatmentwith liquidtitanium halide. The improvement is achieved by using a dialkylaluminum alkyl phenoxide component with the trialkylaluminum co- catalyst normally used. In slurry polymerizations, the isotactic index of the polymer has been improved. It is possible to achieve a variable melt flow index for polypropylene while maintaining good isotactic index. Isotactic index is retained at high levels even though the temperature and/or time of polymerization is varied.
Abstract:
This invention comprises a catalytic component for polymerizing olefins comprising a solid support containing magnesium-halogen bonds, a transition metal halide of a metal selected from Groups IVB and VB of the periodic table, and an electron donor obtained by the steps comprising:
(a) reacting an organometallic compound whose metal comprise members of Groups I to III of the periodic table with an alcohol, ROH, where R is an alkyl, cycloalkyl, or arylalkyl moiety having 1 to 16 carbon atoms, a polysiloxane, and a transition metal halide to form a solid; (b) treating the solid with a transition metal halide optionally int he presence of a polysiloxane to form a treated solid; and (c) reacting the treated solid with an electron donor and a transition metal halide to form the component.
Abstract:
@ Isotactic index improvement is achieved for C 3 and higher alpha olefins in systems containing a catalyst component comprising titanium supported on a magnesium halide support. The titanium component is formed by copulverizing the magnesium halide with one or more eletron donor followed by treatment with liquid titanium halide. The improvement is achieved by using a dialkylaluminum monohalide component with the trialkylaluminum cocatalyst normally used. In non- slurry polymerizatins improvements in both activity and isotactic index have been achieved. In slurry polymerizations, the isotactic index of the polymer has been improved. It is possible to achieve a variable melt flow index for polypropylene while maintaining good isotactic index. Isotactic index is retained at high levels even though the temperature and/or time of polymerization is varied.
Abstract:
A catalytic component for polymerizing olefins comprises a solid support containing magnesium-halogen or manganese-halogen bonds, a transition metal halide of a metal selected from Groups IVB and VB of the periodic table, and electron donors. This catalytic component is obtainable by steps comprising:
(a) contacting a mixture comprising a magnesium halide or manganese halide and at least one electron donor with a Ti(OR) 4 compound to form a solution, where R is a hydrocarbyl or halogenated hydrocarbyl moiety containing 1 to 20 carbon atoms or a halogen, and (b) reacting the solution with a reagent comprising a transition metal halide selected from Groups IVB and VB of the periodic table,
whereby, with a suitable cocatalyst, polyolefin is formed with high activity, showing a high Isotactic Index, and with a narrow range of particle size distribution.