Abstract
A FOUR-YEAR COLLABORATION between Symyx Technologies and Dow Chemical has borne fruit in the discovery of a new class of single-site catalysts for olefin polymerization. new amide-ether-based hafnium catalysts were found using a fully integrated high-throughput screening methodology { J. Am. Chem. Soc. , 125, 4306(2003)}. The results are stunning, says one of the coauthors, Dow chemist James C. Stevens, because the new screening methodology enabled them to do in days or weeks what used to take many months or years. Dow-Symyx researchers set out to discover new catalysts with potential for the production of linear low-density polyethylene, which is a copolymer of ethylene and an α-olefin, such as 1-octene. They first synthesized a library of hafnium and zirconium complexes containing 23 different bidentate and tridentate ligands. To screen these complexes under different activation conditions, they carried out 384 polymerization experiments in just a few hours. work uncovered many catalytical...
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