Abstract: A process for producing polymer particles in a gas phase polymerization reaction using a group 4 metal complex containing at least one cyclic ligand containing delocalized ?-electrons and optionally a flow aid.

Abstract: A process for producing polymer particles in a gas phase polymerization reaction using a group 4 metal complex containing delocalized &pgr;-electrons and optionally a flow aid.

Abstract: There is provided a catalyst containing a transition metal precursor having the formula (C5R15)MX3, an alcohol, a substituted bulky phenol, an aluminoxane, and optionally a support or spray drying material. There is also provided a polymerization process employing the catalyst composition, a polymer produced using the catalyst, and a cable produced therefrom.

Abstract: There is provided a process for the gas phase production of an ethylene-propylene or ethylene-propylene-diene rubber in the presence of a single site or single-site like catalyst (e.g., metallocene) catalyst system and an inert particulate material comprising pretreating the inert particulate material with trialkylaluminum (e.g., tri-isobutylaluminum) before commencing polymerization.

Abstract: There is provided a catalyst containing a transition metal precursor having the formula (C.sub.5 R.sup.1.sub.5)MX.sub.3, an alcohol, a substituted bulky phenol, an aluminoxane, and optionally a support or spray drying material. There is also provided a polymerization process employing the catalyst composition, a polymer produced using the catalyst, and a cable produced therefrom.

Abstract: A method for inhibiting polymer build-up in a recycle line and a heat exchanger during a polymerization process of one or more alpha olefins, particularly sticky polymers, which method comprises introducing as an antifouling an alcohol having 1 to 10 carbon atoms, an alkyl or cycloalkyl ether having 2 to 20 carbon atoms, or a mixture thereof at one or more locations in the recycle gas line in an amount sufficient to inhibit polymer buildup.

Abstract: A process for the production of a homogeneous polyethylene comprising contacting a mixture comprising ethylene, one or more alpha-olefins, and one or more unconjugated dienes, under polymerization conditions, with a catalyst system comprising:(a) a catalyst precursor, in independent or prepolymer form, consisting of vanadium (acetylacetonate).sub.3 ;(b) optionally, a support for said precursor;(c) a cocatalyst consisting of an alkylaluminum halide having the formula AlR.sub.(3-a) X.sub.a wherein each R is independently alkyl having 1 to 14 carbon atoms; each X is independently chlorine, bromine, or iodine; and a is 1 or 2; and(d) a promoter, which is a chlorinated ester having at least 2 chlorine atoms; a saturated or unsaturated aliphatic halocarbon having at least 3 carbon atoms and at least 6 halogen atoms; or a haloalkyl substituted aromatic hydrocarbon wherein the haloalkyl substituent has at least 3 halogen atoms.

Abstract: A process for the production of a homogeneous polyethylene comprising contacting a mixture comprising ethylene, one or more alpha-olefins, and one or more unconjugated dienes, under polymerization conditions, with a catalyst system comprising:(a) a catalyst precursor, in independent or prepolymer form, consisting of vanadium (acetylacetonate).sub.3 ;(b) optionally, a support for said precursor;(c) a cocatalyst consisting of a trialkylaluminum; and(d) a promoter consisting of an unsaturated aliphatic halocarbon having at least 3 carbon atoms and at least 6 halogen atoms or a haloalkyl substituted aromatic hydrocarbon wherein the haloalkyl substituent has at least 3 halogen atoms,with the proviso that sufficient unconjugated diene is present in the mixture to provide, in the homogeneous polyethylene, about 0.01 to less than about one percent by weight diene based on the weight of the homogeneous polyethylene.

Abstract: A process for the production of polyethylenes or EPRs comprising contacting a mixture comprising ethylene, one or more alpha-olefins, and, optionally, a diene, under polymerization conditions, with a catalyst system comprising:(A) a catalyst precursor comprising:(i) a vanadium compound, which is the reaction product of(a) VX.sub.3 wherein each X is independently chlorine, bromine, or iodine; and(b) an electron donor, which is a liquid, organic Lewis base in which VX.sub.3 is soluble;(ii) a modifier having the formula BX.sub.3 or AlR.sub.(3-a) X.sub.a wherein each R is independently alkyl having 1 to 14 carbon atoms; each X is as defined above; and a is 0, 1, or 2; and(iii) a support for said vanadium compound and modifier,said catalyst precursor being in an independent or prepolymerized state,(B) a cocatalyst consisting of a compound having the formula AlR.sub.(3-a) X.sub.

Abstract: A process for the production of a homogeneous polyethylene comprising contacting ethylene, one or more alpha-olefins, and one or more unconjugated dienes, under polymerization conditions, with a catalyst system comprising:(A ) a modified supported vanadium based catalyst precursor;(B) an alkylaluminmn halide cocatalyst; and(C) a promoter consisting of an unsaturated aliphatic halocarbon or a haloalkyl substituted aromatic hydrocarbonwith the proviso that sufficient unconjugated diene is present to provide in the homogeneous polyethylene about 0.01 to less than about one percent by weight diene.

Abstract: A process comprising contacting a mixture comprising ethylene, propylene, and, optionally, a diene, in the gas phase, under polymerization conditions, with a catalyst system comprising:(a) a catalyst precursor, in independent or prepolymer form, consisting of vanadium (acetylacetonate).sub.3 ;(b) optionally, a support for said precursor;(c) a cocatalyst consisting essentially of (i) an alkylaluminum halide having the formula AlR.sub.(3-a) X.sub.a wherein each R is independently alkyl having 1 to 14 carbon atoms; each X is independently chlorine, bromine, or iodine; and a is 1 or 2, and (ii) optionally, a trialkylaluminum provided that the molar ratio of alkylaluminum halide to trialkylaluminum is at least about 1.