Patent ID: 6573344
Filing Date: 2003-06-03
Classification: C08F,Y10S

Abstract:
A polymerization process for producing propylene polymer, said process comprising:(a) contacting at least one organometal compound, at least one organoaluminum compound, at least one treated solid oxide compound, propylene, and ethylene in a manner such that the organometal compound, the at least one organoaluminum compound, and the at least one treated solid oxide compound contact the propylene before contacting each other; or alternatively, (b) pre-contacting the treated solid oxide compound and the propylene to produce a first mixture prior to contacting said first mixture with said at least one organometal compound, said organoaluminum compound, and ethylene; polymerizing said propylene in a polymerization zone under polymerization conditions to produce said propylene polymer; and wherein the amount of ethylene added to said polymerization zone is that which results in less than 1% by weight ethylene incorporation in said propylene polymer; wherein said organometal compound has the following general formula: (X1)(X2)(X3)(X4)M1 wherein M1 is selected from the group consisting of titanium, zirconium, and hafnium; wherein (X1) and (X2) are independently selected from the group consisting of cyclopentadienyls, indenyls, fluorenyls, substituted cyclopentadienyls, substituted indenyls, and substituted fluorenyls; wherein substituents on said substituted cyclopentadienyls, substituted indenyls, and substituted fluorenyls of (X1) and (X2) are selected from the group consisting of aliphatic groups, cyclic groups, combinations of aliphatic and cyclic groups, silyl groups, halide substituted alkyl groups, halides, organometallic groups, phosphorus groups, nitrogen groups, boron groups, and germanium groups; wherein any substituent on (X1) and (X2) is optionally a bridging group which connects (X1) and (X2); wherein (X3) and (X4) are independently selected from the group consisting of halides, aliphatic groups, substituted aliphatic groups, cyclic groups, substituted cyclic groups, combinations of aliphatic groups and cyclic groups, combinations of substituted aliphatic groups and cyclic groups, combinations of aliphatic groups and substituted cyclic groups, combinations of substituted aliphatic groups and substituted cyclic groups, amido groups, substituted amido groups, phosphido groups, substituted phosphido groups, alkyloxide groups, substituted alkyloxide groups, aryloxide groups, substituted aryloxide groups, organometallic groups, and substituted organometallic groups; and wherein said organoaluminum compound has the following general formula: Al(X5)n(X6)3âˆ’n wherein (X5) is a hydrocarbyl having from 1-20 carbon atoms; wherein (X6) is a halide, hydride, or alkoxide; wherein â€œnâ€  is a number from 1 to 3 inclusive; and wherein said treated solid oxide compound is produced by a process comprising: a) contacting at least one solid oxide compound with at least one electron-withdrawing anion source compound or at least one metal salt compound; and b) calcining said solid oxide compound before, during, or after contacting said electron-withdrawing anion source compound or said metal salt compound to produce said treated solid oxide compound.