Occidental Chemical Corporation

Equistar Chemicals, LP

Lyondell Petrochemical Company

Mary K Cocoman

Sandor M Nagy

Ramesh Krishnamurti

John A Tyrell

David Y Tang

Leonard V Cribbs

Harry E Buckholtz

Bradley P Etherton

Walter M Opalinski

Willis T Schwartz

Michael J Fifolt

Lawrence B Fertel

William S Derwin

Karl W Seper

Thomas F Smolka

Edward J Colman

Transition metal catalysts containing bidentate ligands and method of using and preparing same

Disclosed is a process for polymerizing vinyl chloride monomer in the presence of light. A mixture is formed of liquid vinyl chloride monomer, preferably about 10 to about 250 ppm of a metallocene catalyst, about 1 to about 2000 moles of an aluminum-containing cocatalyst per mole of catalyst, and up to about 500 moles of a Lewis base per mole of aluminum in the cocatalyst. Selected alkyl groups from the aluminum-containing cocatalyst can be placed on the ends of the poly (vinyl chloride) chains.

Photo-polymerization of vinyl chloride using metallocene catalysts

Disclosed is a method of making trichloromethoxybenzene. A mixture is prepared of anisole and a source of chlorine free radicals, such as chlorine or sulfuryl chloride. The reaction is performed in a solvent, which can be either benzotrifluoride, orthochlorobenzotrifluoride, metachlorobenzotrifluoride, parachlorobenzotrifluoride, or dichlorobenzotrifluoride. The mixture is exposed to actinic radiation, such as ultraviolet light, which generates the chlorine free radicals.

Method of making trichloromethoxybenzene

Disclosed is a novel bidentate pyridine transition metal catalyst having the general formula ##STR1## where Y is O, S, NR, ##STR2## each R is independently selected from hydrogen or C.sub.1 to C.sub.6 alkyl, each R' is independently selected from C.sub.1 to C.sub.6 alkyl, C.sub.1 to C.sub.6 alkoxy, C.sub.6 to C.sub.16 aryl, halogen, or CF.sub.3, M is titanium, zirconium, or hafnium, each X is independently selected from halogen, C.sub.1 to C.sub.6 alkyl, C.sub.1 to C.sub.6 alkoxy, or ##STR3## L is X, cyclopentadienyl, C.sub.1 to C.sub.6 alkyl substituted cyclopentadienyl, indenyl, fluorenyl, or ##STR4## and 'n' is 1 to 4. Also disclosed is a method of making a poly-.alpha.-olefin comprising polymerizing an .alpha.-olefin monomer using that catalyst or a catalyst that has the general formula ##STR5## where Y, M, L, X, and R' were previously defined.

Polymerization of .alpha.-olefins with transition metal catalysts based

Halophthalic anhydrides are prepared by the liquid phase reaction of a brominating agent with halogen substituted hexa- or tetra-hydrophthalic anhydrides.

Process for the preparation of halophthalic anhydrides

A process for the preparation of a halophthalic anhydride, such as chlorophthalic anhydride, comprising the liquid phase reaction of bromine with a halogen substituted hexa- or tetra-hydrophthalic anhydride to produce halophthalic anhydride and gaseous HBr, and reacting the gaseous HBr with chlorine to regenerate bromine.

A process for the production of 4-bromophthalic anhydride which comprises the reaction of 4-chlorotetrahydrophthalic anhydride with elemental bromine, in the presence of a catalytically effective amount of iron or an iron salt is disclosed.

Process for the preparation of 4-bromophthalic anhydride

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Grand Island, NY, United States of America

Mary K Cocoman