E.i. Dupont De Nemours and Company

Richard Beckerbauer

Wilson Tam

Douglas J Adelman

Qun Sun

Mark Andrew Harmer

Dennis S Donald

Shlomo Rozen

Henry Max Schleinitz

Mureo Kaku

Hui Hsiung

Frederick Claus Zumsteg, Jr

John K Beasley

Jose M Rodriguez Parada

Frank C Wilson

This invention concerns a process for the copolymerization of formaldehyde with cyclic ethers, the process comprising combining in a hydrocarbon solvent a cyclic ether, a cationic initiator comprising an anion formed from tetraphenyl borate derivatives, and mixtures thereof, and a cation, and anhydrous formaldehyde. These initiators provide high activity, high cyclic ether incorporation rates, and stability while minimizing the production of by-products.

Copolymerization of formaldehyde and cyclic ethers using initiators

Modified fluorosulfonic acids

Disclosed is a process for copolymerization of formaldehyde with cyclic ethers in the presence of organic nitro compounds. The process enhances the selectivity for the cyclic copolymer.

Process for co-polymerization of formaldehyde with cyclic ethers in the

Films of a multiplicity of adjacent polymeric, amphiphilic monolayers, said film having second order optical nonlinearity which increases with the number of active monolayers are provided, as well as novel polymers from which said films are prepared.

Fluoropolymers

Novel organic glass compositions are disclosed which are poled to achieve nonlinear optical properties. Novel compounds useful for making said poled compositions are also disclosed; as are a method and a device for transforming electromagnetic radiation using a nonlinear optical element formed from said compositions; and certain intermediates for making novel compounds.

Nonlinear optical materials

Polymeric films for second order nonlinear optics

A process for production of fluorinated sulfones from fluorinated organic sulfides by oxidation of the sulfides with an oxidizing reagent made from fluorine, water and acetonitrile. The sulfones are useful as second order nonlinear optical dyes.

Oxidation of fluorine containing sulfides to sulfones

Light-transmitting optical fiber having a core of a deuterated acrylate polymer exhibits remarkably high transmission of light in the visible and at certain wavelengths in the near-infrared region of the spectrum.

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Wilmington, DE, United States of America

Richard Beckerbauer