Hoechst Aktiengesellschaft

Farbwerke Hoechst Aktiengesellschaft Vormals Meister Lucius Bruning

Franz Jakob

Hans-Jerg Kleiner

Klaus Warning

Gunter Keil

Friedrich Herold

Ernst Horoldt

Ulrich Bollert

The invention relates to filaments, fibers, pulps, films and sheets from a copolyamide which has at least the recurring structural units of the formulae

Shaped structure of aromatic copolyamide from aromatic diamine mixture

Molding compositions containing triketoimidazolidine precondensates,

Permanently flame-resistant synthetic linear polyesters are obtained by irporating by condensation into the polyester composed of the usual dicarboxylic acid and diol units an alkylphosphine oxide of the formula ##SPC1## Wherein the radicals R to R.sub.4 represent organic radicals of which R.sub.2, R.sub.3 and Z may be substituted by 2 hydroxyl groups altogether, R.sub.2, R.sub.3 and R.sub.4 may also represent hydrogen and a is zero or a whole number of from 1 to 4. The flame-resistant polyesters are processed into shaped structures such as fibers, filaments, sheets, injection and compression molded articles characterized by good flameproofness and dyeing properties.

Flame resistant synthetic linear polyesters and shaped structures made

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Hofheim am Taunus, Germany

Franz Jakob