Polymerization process using a metallocene catalyst system

Details Polymerization process using a metallocene catalyst system Polymerization process using a metallocene catalyst system

2005-05-17

2005-05-17

Lu, Caixia (Department: 1713)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C502S152000, C502S120000, C526S068000, C526S129000, C526S165000, C526S170000, C526S943000

Reexamination Certificate

active

06894131

ABSTRACT:
Provided is a process for polymerizing olefins in the presence of a metallocene catalyst compound having at least one fluoride or fluorine containing leaving group. More particularly, the present invention is directed to a process and catalyst composition having improved reactor performance, reducing or eliminating the need for anti-fouling additives to the catalyst composition and/or the reactor. In one embodiment, the invention is a process of polymerizing olefins comprising contacting ethylene and at least one comonomer with a supported catalyst system comprising a metallocene catalyst compound, the metallocene catalyst compound comprising at least one fluoride ion or fluorine containing leaving group; and wherein the supported catalyst system comprises an inorganic oxide support having an average particle size of from 35 μm or less and a pore volume of from 1 to 2 cm3/g. The polymer product resulting therefrom is, in one embodiment, a copolymer having a density in the range of from 0.910 g/cm3to 0.940 g/cm3; a molecular weight distribution of from 1.8 to 4; and an I2of from 0.1 dg/min to 10 dg/min and is suitable for such articles as films.

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