Chelating pyrimidines as ligands for single-site olefin...

Details Chelating pyrimidines as ligands for single-site olefin... Chelating pyrimidines as ligands for single-site olefin...

2005-04-05

2005-04-05

Wu, David W. (Department: 1713)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S161000, C526S134000, C526S348000

Reexamination Certificate

active

06875830

ABSTRACT:
A single-site catalyst system useful for polymerizing olefins is disclosed. The catalyst system comprises an optional activator and a complex that incorporates a Group 3 to 10 transition metal and at least one neutral or anionic chelating pyrimidine ligand. The ligands are easy to make, and they are readily incorporated into transition metal complexes, including those based on late transition metals. By modifying the chelating groups and other substituents on the pyrimidine ring, polyolefin makers can increase catalyst activity and control polymer properties.

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