Isovolta- Osterreichische Isolierstoffwerke Aktiengesellschaft

Isovolta Osterreichische Isolierstoffwerke

Hermann Mark

Otto Szabolcs

A process for the spinning of synthetic fibers comprising dissolving at least one polycondensation product of at least one polyfunctional phenol component with the phenolic groups attached to a central carbon atom so they are hindered in their free rotation and at least one polyfunctional carboxylic acid chloride having an inherent viscosity .eta. inh greater than 0.5 dl/g in a solvent with a boiling point less than 100.degree. C. to form a spinning solution, forcing the spinning solution through spinning nozzles into a liquid precipitant for fiber formation at a temperature at least 8.degree. C. less than the solvent boiling point to withdraw the majority of the solvent from the fibers, stretching the resulting fibers to 2 to 6 times their length and removing the residual solvent.

Production of synthetic fibers

A process for the preparation of aromatic polyesters which are characterized particularly by high-temperature stability and difficult inflammability and which show, in addition, a low development of heat and a high char yield in combustion.

Growing community of inventors

Brooklyn, NY, United States of America

Hermann Mark