Abstract: A catalyst composition for the polymerization of olefins is provided, which comprises the reaction product of a spirocycle, a complex of an atom selected from Groups 3-14 and the Lanthanides, and an activating cocatalyst.

Abstract: A catalyst composition for the polymerization of olefins is provided, which comprises the reaction product of a fulvene, a complex of an atom selected from Groups 3-14 and the Lanthanides, and an activating cocatalyst.

Abstract: The invention relates to a process for the polymerization of olifins in the presence of an activated catalyst composition comprising a single site catalyst precursor and an activating cocatalyst, which comprises contacting outside of a polymerization reactor a single site catalyst precursor with an activating cocatalyst before, during, or after contacting the single site catalyst precursor with a weakly coordinating electron donor that does not substantially polymerize during either contacting.

Abstract: A catalyst composition for the polymerization of olefins is provided, which comprises the reaction product of a spirocycle, a complex of an atom selected from Groups 3-14 and the Lanthanides, and an activating cocatalyst.

Abstract: A catalyst composition for the polymerization of olefins is provided, which comprises the reaction product of a fulvene, a complex of an atom selected from Groups 3-14 and the Lanthanides, and an activating cocatalyst.

Abstract: There is provided a polymerization process for the production of olefin polymers using a catalyst composition comprising: a) (i) a catalyst containing at least one cycloalkadienyl ligand substituted with at least one electron donor residue and coordinated with a metal selected from the group consisting of scandium, yttrium, and lanthanide metals; or (ii) a catalyst containing two cycloalkadienyl ligands coordinated with a metal selected from the group consisting of scandium, yttrium, and lanthanide metals, said cycloalkadienyl ligands connected by a bridging group comprising at least one Group IVA element and at least one electron donor residue; and b) an activating cocatalyst of the formula R.sub.x M', wherein R is alkyl, aryl, or hydride; M' is a Group I, II, or IIIA metal or a Group I, II, or IIIA metal complexed with oxygen, nitrogen, or a halide; and x is equal to the valence of M'.

Abstract: A method for preparing an activated catalyst composition comprising a single site catalyst precursor and an activating cocatalyst, which comprises contacting outside of a polymerization reactor a single site catalyst precursor with an activating cocatalyst before, during, or after contacting the single site catalyst precursor with a weakly coordinating electron donor such as 1-hexene.

Abstract: A process for the gas-phase polymerization of polymers which allows for the introduction of an unsupported polymerization catalyst system into the gas-phase reactor, wherein the unsupported polymerization catalyst system comprises (i) a non-volatile materials fraction containing a polymerization catalyst; (ii) a solvent fraction which is at least partially miscible with the non-volatile materials fraction and which is sufficiently volatile to allow for the formation of polymerization catalyst particles when the mixture of the solvent fraction and the non-volatile materials fraction is sprayed into the reactor; (iii) a compressed fluid; and (iv) optionally a slowly vaporizing solvent.

Abstract: A catalyst composition comprising: a) (i) a catalyst containing at least one cycloalkadienyl ligand substituted with at least one electron donor residue and coordinated with a metal selected from the group consisting of scandium, yttrium, and lanthanide metals; or (ii) a catalyst containing two cycloalkadienyl ligands coordinated with a metal selected from the group consisting of scandium, yttrium, and lanthanide metals, said cycloalkadienyl ligands connected by a bridging group comprising at least one Group IVA element and at least one electron donor residue; and b) an activating cocatalyst of the formula R.sub.x M', wherein R is alkyl, aryl, or hydride; M' is a Group I, II, or IIIA metal or a Group I, II, or IIIA metal complexed with oxygen, nitrogen, or a halide; and x is equal to the valence of M'.