Method for transitioning from a catalyst to an incompatible...

Details Method for transitioning from a catalyst to an incompatible... Method for transitioning from a catalyst to an incompatible...

2005-01-04

2005-01-04

Cheung, William K. (Department: 1713)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S086000, C526S090000, C526S901000, C526S113000, C526S154000

Reexamination Certificate

active

06838532

ABSTRACT:
The present invention is a process for transitioning from a first polymerization catalyst system to a second polymerization catalyst system incompatible with the first polymerization catalyst system in a gas-phase reactor. The novel process comprises conducting a first polymerization reaction using a first polymerization catalyst system; stopping the first polymerization reaction; removing the contents of the first polymerization reaction from the reactor while maintaining a substantially closed system; then, in the substantially closed system, introducing a substantially contaminant free seedbed into the reactor; introducing a second feed system and a second catalyst system into the reactor; and conducting a second polymerization reaction.

REFERENCES:
patent: 4243619 (1981-01-01), Fraser et al.
patent: 4543399 (1985-09-01), Jenkins, III et al.
patent: 4588790 (1986-05-01), Jenkins, III et al.
patent: 5352749 (1994-10-01), DeChellis et al.
patent: 5405922 (1995-04-01), DeChellis et al.
patent: 5436304 (1995-07-01), Griffin et al.
patent: 5442019 (1995-08-01), Agapiou et al.
patent: 5462999 (1995-10-01), Griffin et al.
patent: 5672665 (1997-09-01), Agapiou et al.
patent: 5672666 (1997-09-01), Muhle et al.
patent: 5747612 (1998-05-01), Agapiou et al.
patent: 5753786 (1998-05-01), Agapiou et al.
patent: 6218484 (2001-04-01), Brown et al.
patent: 1 099 715 (2001-05-01), None
patent: WO 9639450 (1996-12-01), None
patent: WO 9732905 (1997-09-01), None
patent: WO 0058377 (2000-10-01), None

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