Patent ID: 6500905
Filing Date: 2002-12-31
Classification: B01J,C08F,Y10S

Abstract:
A process for making stereoregular or regioregular polymers comprising feeding an unsupported metallocene catalyst and a cocatalyst in liquid form to a gas phase reactor in a resin lean particle zone within the reactor without immediately contacting growing polymer particles in the reactor to provide an average particle size ranging from about 0.025 to about 0.15 cm (about 0.01 to about 0.06 inches), wherein the metallocene is represented by the formula:(L)2R1MX(zâˆ’2)â€ƒâ€ƒ(I) wherein M is a metal from groups III to VIII or a rare earth metal of the Periodic Table; L is a &pgr;-bonded substituted indenyl ligand coordinated to M; R1 is a bridging group selected from the group consisting of C1-C4 substituted or unsubstituted alkylene radicals, dialkyl or diaryl germanium or silicon groups, and alkyl or aryl phosphine or amine radicals; each X is independently hydrogen, an aryl, alkyl, alkenyl, alkylaryl, or arylalkyl radical having 1-20 carbon atoms, a hydrocarboxy radical having 1-20 carbon atoms, a halogen, R2CO2â€”, or R22NCO2â€”, wherein each R2 is a hydrocarbyl group containing 1 to about 20 carbon atoms; and z is the valence state of M, wherein the liquid catalyst is in a carrier gas surrounded by at least one particle-deflecting gas having a velocity sufficient to deflect resin particles away from the path of the liquid catalyst as it enters the reactor and the particle deflecting gas is different from the carrier gas and/or the velocity of the particle deflecting gas entering the reactor is different from the velocity of the carrier gas entering the reactor.