Process for transitioning between incompatible catalysts...

Details Process for transitioning between incompatible catalysts... Process for transitioning between incompatible catalysts...

2005-03-15

2005-03-15

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...

C526S084000, C526S090000, C526S901000

Reexamination Certificate

active

06867270

ABSTRACT:
The present invention is a process for transitioning from a first polymerization reaction to a second polymerization reaction incompatible with the first polymerization reaction in a gas-phase reactor. The novel process comprises conducting multiple polymerization reactions, capturing and storing a substantially contaminant-free polymerization product from each multiple polymerization reaction for use as a selected substantially contaminant-free seedbed in a second polymerization, wherein the polymerization product from each multiple polymerization reaction is rendered substantially contaminant-free by stripping or venting reactants and contaminants and is maintained as substantially contaminant-free by storage under an inert atmosphere.

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U.S. Appl. No. 10/683,711 filed Oct. 10, 2003.

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