E.i. Dupont De Nemours and Company

Alexa A Dembek

Marianne Marsi

Steven Raymond Lustig

Robert Ray Burch

Maria Spinu

Andrew E Feiring

This invention concerns a process for polymerizing cyclic oligomers to homopolymers or copolymers, conducted in the presence of one or more linear polymers.

Polymerizations based on cyclic oligomer

Novel ruthenium pi-arene complexes in which the arene ring has 3 or more halogen atoms bound to it are disclosed. These compounds are reacted with phenoxides and thiophenoxides to form ruthenium pi-arene complexes of polyfunctional aromatic ethers and thioethers which are useful as monomers and crosslinking agents.

Polyhaloaromatic ruthenium complexes and reactions thereof

Polyarylene oxides and sulfides which are .pi.-arene complexed with transition metals are disclosed. Also disclosed is a process for making a polyarylene sulfide by reaction of a .pi.-arene complexed arylene dihalide with the dianion of an arylene dithiol. The complexed polymers are soluble in common organic solvents, and the polymer solutions can be used to make films and coatings or to encapsulate parts.

Transition metal complexes of polyarylene oxides and sulfides

Disclosed herein are chromium carbonyl complexes of polyamides containing units derived from aromatic diamines in which about 10 to about 90% of those units are complexed with a chromium carbonyl compound, and a process for making them. When aramids are used, the solubility of the polymer in organic solvents is enhanced, and in the case of certain aramids lyotropic solutions are formed. These solutions can be used to make anisotropic films and fibers.

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Wilmington, DE, United States of America

Alexa A Dembek