Cocatalysts for reduction of production problems in...

Details Cocatalysts for reduction of production problems in... Cocatalysts for reduction of production problems in...

2007-10-16

2007-10-16

Choi, Ling-Sui (Department: 1713)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S352000, C526S348300, C526S348400, C526S348600, C526S160000, C526S934000, C526S124500, C502S103000, C502S132000, C502S152000

Reexamination Certificate

active

11158454

ABSTRACT:
Polyolefins may be prepared using a cocatalyst conforming to the formula:in-line-formulae description="In-line Formulae" end="lead"?AIRz(Xz)nLzmin-line-formulae description="In-line Formulae" end="tail"?wherein Rzis a linear or branched organic moiety having at least 5 carbons and Xzis a linear or branched organic moiety having at least 5 carbons or a heterocyclic moiety having at least 4 atoms and can be anionic or di-anionic. The aluminum complex may also be in the form of an adduct complex where Lzis a Lewis base and m=1-3. The cocatalyst Rzcomponents are selected such that they do not react with water under polymerization conditions to form a species that is highly soluble in the polymerization diluent. Use of the specified cocatalyst reduces fouling during metallocene-catalyzed runs and “post-metallocene hangover” when the same production equipment is transitioned to non-metallocene catalyst runs using catalysts such as chromium.

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G. G. Hlatky;Heterogeneous Single-Sitel Catalysts for Olefin Polymernzation, Chemical Reviews, 2000, vol. 100, No. 4, pp. 1347-1376.

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