摘要:
A solid, hydrocarbon-insoluble, olefin-polymerization catalyst component having substantially uniform particles useful in polymerizing olefins is formed by:reacting a magnesium-containing compound with carbon dioxide or sulfur dioxide;forming a two-phase mixture of the resulting magnesium-containing compound with a suitable liquid hydrocarbon-miscible phase and a suitable polar solvent phase;forming particles by adding the two-phase mixture after vigorous agitation to a liquid hydrocarbon; andcontacting the formed particles at least once with a transition metal halide in the presence of an electron donor.
摘要:
In a solid hydrocarbon-insoluble, alpha-olefin polymerization catalyst component with superior activity, stereospecificity and morphology characteristics comprising the product formed by (A) forming a solution of a magnesium-containing species from a magnesium alkyl (or hydrocarbyl) carbonate or a magnesium carboxylate; (B) precipitating solid particles from such magnesium-containing toluene-based solvent by treatment with a transition metal halide and an organosilane; (C) reprecipitating such solid particles from a mixture containing a cyclic either; and (D) treating the reprecipitated particles with a transition metal compound and an electron donor, the morphology of such component is modified by incorporating a morphology-affecting amount of C.sub.8 -C.sub.10 aromatics within the toluene-based solvent in Step B, Step A, in Step C prior to addition of ether, or combinations thereof.
摘要:
A process for making a magnesium-containing supported titanium-containing, alpha-olefin polymerization or co-polymerization catalyst or catalyst component having a large particle size, semi-spherical particle shape and high resistance to attrition.
摘要:
A titanium-containing olefin polymerization catalyst component comprises a titanium-containing component formed by reducing titanium tetrachloride with an organoaluminum compound, optionally contacting the resulting reduced solid with a pretreatment amount of alpha-olefin monomer under polymerization conditions, and reacting the resulting product with a Lewis base complexing agent and a haloalkylchlorosilane.
摘要:
A solid hydrocarbon-insoluble, alpha-olefin polymerization catalyst component with superior activity, stereospecificity and morphology characteristics comprises the product formed by (A) forming a solution of a magnesium-containing species from a magnesium carbonte or a magnesium carboxylate; (B) precipitating solid particles from such magnesium-containing solution by treatment with a transition metal halide and an organosilane; (C) reprecipitating such solid particles from a mixture containing a cyclic ether; and (D) treating the reprecipitated particles with a transition metal compound and an electron donor.
摘要:
In an alpha-olefin polymerization process using a transition metal halide-aluminum alkyl catalyst system, addition of minor, effective amounts of a sterically hindered 5- or 6-membered cyclic ether decreases the amount of low molecular weight or amorphous polymer produced.
摘要:
In an alpha-olefin polymerization process using a transition metal halide-aluminum alkyl catalyst system, addition of minor, effective amounts of aromatic amines or amine N-oxides substituted with electron withdrawing groups decreases the amount of low molecular weight or amorphous polymer produced.
摘要:
A solid hydrocarbon-insoluble, alpha-olefin polymerization catalyst component with superior activity, stereospecificity and morphology characteristics comprises the product formed by (A) forming a solution of a magnesium-containing species from a magnesium carbonate or a magnesium carboxylate; (B) precipitating solid particles from such magnesium-containing solution by treatment with a transition metal halide and an organosilane; (C) reprecipitating such solid particles from a mixture containing a cyclic ether; and (D) treating the reprecipitated particles with a transition metal compound and an electron donor.
摘要:
A novel catalyst and process for producing highly-crystalline polypropylene or pure block or terminal block types of copolymers of propylene and ethylene or propylene and another alpha-olefin in excellent yields which coproduce minor amounts of low-molecular-weight and, particularly, amorphous polymers. The catalyst comprises an aluminum alkyl compound, titanium trichloride, a sterically-hindered cyclic amine and an organotin sulfide. This novel catalyst and process are useful in polymerization techniques which use a polymerization medium or those in which the condensed monomer is polymerized from the liquid phase or those in which polymerization is accomplished from monomer substantially in the vapor phase.
摘要:
A catalyst or catalyst component for the polymerization of copolymerization of alpha-olefins, which is formed by a process comprising forming a solution of a magnesium-containing species in a liquid comprising at least one alcohol.