E.i. Dupont De Nemours and Company

Win-Chung Lee

Mario Joseph Nappa

Robert Clayton Wheland

Xuehui Sun

Sundar M Rao

Colin Anolick

Robert B Fish, Jr

Gregory D Cramer

Ramdas Dujari

Jerome P Moraczewski

Francis J Eichstadt

A process is disclosed for making 1,1,1,4,4,4-hexafluoro-2-butene. The process involves reacting 2,2-dichloro-1,1,1-trifluoroethane with copper in the presence of an amide solvent and 2,2'-bipyridine. A process is also disclosed for making 1,1,1,4,4,4-hexafluoro-2-butene. The process involves reacting 2,2-dichloro-1,1,1-trifluoroethane with copper in the presence of an amide solvent and a Cu(I) salt. A process is further disclosed for making 1,1,1,4,4,4-hexafluoro-2-butene. The process involves reacting 2,2-dichloro-1,1,1-trifluoroethane with copper in the presence of an amide solvent, 2,2&#x2032;-bipyridine and a Cu(I) salt.

Process for making 1,1,1,4,4,4-Hexafluoro-2-butene

Polyacetal compositions and blends toughened with polyvinylbutyral having enhanced adhesive surface properties, including enhanced surface adhesion and low surface gloss, are disclosed. Also disclosed are articles of manufacture comprising the polyacetal compositions described herein.

Toughened polyacetal compositions and blends having low surface gloss

Polyamide compositions and blends toughened with polyvinylbutyral and containing glass fiber are disclosed, together with articles of manufacture. These materials may also contain non-reactive polymers and antioxidants.

Toughened, glass filled polyamide compositions and blends having improved stiffness, and articles made therefrom

This invention concerns a process for increasing the molecular weight and viscosity of polyamides and other condensation polymers, by first injecting an inert gas into the polymer melt at elevated pressure, then stripping the volatiles from the polymer through the application of reduced pressure, followed by holding the polymer at elevated temperatures long enough for the reaction to occur. Activators may be added to the polymer. Port areas used in the stripping zone, may be kept hot for continuous operation.

Process for increasing the molecular weight of polyamides and other

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Hockessin, DE, United States of America

Win-Chung Lee