Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymerizing in two or more physically distinct zones
Reexamination Certificate
2006-11-22
2010-06-22
Wu, David (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymerizing in two or more physically distinct zones
C526S086000, C526S090000
Reexamination Certificate
active
07741414
ABSTRACT:
A process for transitioning between Ziegler Natta (Z/N) polymerization catalysts and Second Polymerization catalysts in a polymerization system which includes at least two polymerization reactors. During the transition, the Z/N catalyst is used in the “downstream” reactor, thereby providing a flow of polymer to finishing operations. This eliminates the need for lengthy shutdowns of finishing equipment and thereby improves the efficiency of the plant operations.
REFERENCES:
patent: 5753786 (1998-05-01), Agapiou et al.
patent: 7629422 (2009-12-01), Goode et al.
patent: 2003/0088037 (2003-05-01), Stevens et al.
Brown Stephen John
Liebrecht Bobbi Leigh
Taylor Kenneth Edward
Eng Elizabeth
Johnson Kenneth H.
Nova Chemicals (International) S.A.
Wu David
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