Occidental Chemical Corporation

Equistar Chemicals, LP

Arco Chemical Technology, L.p.

John Tyrell

Sandor M Nagy

Bradley P Etherton

Ramesh Krishnamurti

David Y Tang

Jerold C Rosenfeld

Jin-O Choi

Disclosed is a method of polymerizing vinyl chloride monomer using a catalyst having the general formula

Method of polymerizing vinyl chloride monomer using an organocobalt (III) catalyst

Single-site catalyst systems containing alkylimido ligands are disclosed. The catalyst systems comprise a co-catalyst and a Group 3-10 transition metal catalyst. The catalyst includes an alkyl- or arylimido ligand and a polymerization-stable, anionic ligand selected from boraaryl, pyrrolyl, and azaborolinyl. When used to polymerize olefins, the catalyst systems are highly productive, give good comonomer incorporation, and give polymers with narrow molecular weight distributions.

Polymerization-stable anionic ancillary ligand containing alkylimido

A novel metallocene catalyst for the polymerization of olefin (co)polymers is of the general formula:

Sulfonyl catalysts and method of using the same

Olefin polymerization catalysts containing benzothiazole

Disclosed is an aromatic diamine having the general formula ##STR1## where A is a group containing at least one aromatic ring, each Y is independently selected from ##STR2## R is a group containing at least one olefinically unsaturated group, R' is hydrogen, alkyl to C.sub.25, aryl, or R, n is 1 to 4, and the number of olefinic groups in Y is at least 3 when each Y is ##STR3## and otherwise is at least 2. Photosensitive polyamic acids and polyimides can be prepared from the aromatic diamines which can be crosslinked with light to a mask to form patterns on a substrate.

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Williamsville, NY, United States of America

John Tyrell