Bayer Aktiengesellschaft

Karl H Hermann

Hans-Josef Buysch

Bert Brassat

Werner Nielinger

Dietrich Michael

Erich Eimers

Heinrich Haupt

Hans-Lothar Dorsch

Wolfgang Alewelt

Helmut Schulte

Weather-resistant polyamides stabilized by a combination of special cyclic phosphorous acid esters and certain indole derivatives.

Weather-resistant polyamides

Red phosphorus stabilized with cadmium salts of carboxylic acids is suitable for use as a flameproofing agent for polyamide moulding compositions.

Stabilized red phosphorus and its use for flameproofing thermoplastic

A method of producing polyamide foils by extrusion wherein a dispersion of a solid inorganic nucleating agent is added to the polyamide.

Method of producing polyamide foils

A process for the production of polyamides by the polycondensation of aqueous solutions of salts of diamines and dicarboxylic acids by continuously introducing the aqueous salt solution into a precondensate melt under atmospheric pressure and simultaneously distilling off the water and maintaining the temperature of the melt at a minimum temperature of 180.degree. C.

Process for the continuous production of polyamides

Stabilized polyamides containing from 0.02 to 5%, by weight of a diphenylamine compound corresponding to the following general formula: ##STR1## wherein R.sup.1 and R.sup.3, which may be the same or different, represent hydrogen, a CH.sub.3 --, C.sub.2 H.sub.5 -- or isopropyl group and R.sup.3 is in the o-, m- or p-position to the N-atom substitution;

Stabilized polyamides

Phosphorous acid esters obtained by reacting bisphenols with phosphorous trihalogenide or triphosphite and optionally or mono- or polyhydroxy compound are especially useful for stabilizing polyamides.

Phosphorous acid esters and their use for stabilizing polyamides

To prepare basic dyestuffs of the general formula ##STR1## in which A and B independently of one another represent a hetero-aromatic radical or a radical of the general formula ##STR2## compounds of the general formula

Preparation of basic triarylmethane dyestuffs

To synthesize triarylmethane dyestuffs of the general formula ##STR1## in which R.sup.1 and R.sup.2 represent optionally substituted alkyl, aryl or aralkyl or

Preparation of cationic triarylmethane dyestuffs

In order to prepare basic dyestuffs of the general formula ##STR1## in which A and B independently of one another represent a hetero-aromatic radical or a radical of the general formula ##STR2## in which Ar denotes the grouping ##STR3## in which Y represents hydrogen or a non-ionic substituent and

Process for the preparation of basic dyestuffs

Cationic dyestuffs of the formula ##STR1## wherein R.sub.1 represents a lower alkyl, alkenyl or hydroxyalkyl radical,

Thiazolediazacyanine dyestuffs

Phosphorous acid esters obtained by reacting bisphenols with phosphorous trihalogenide or triphosphite and optionally or mono - or polyhydroxy compound are especially useful for stabilizing polyamides.

Cyclic phosphorous acid esters

Dyestuffs of the formula ##STR1## wherein R.sub.1 -R.sub.2 denote hydrogen, alkyl, halogenoalkyl, halogen, alkoxy, alkylmercapto, alkylsulfphonyl, alkoxysulphonyl, alkylcarbonyl, alkoxycarbonyl, nitro or cyano,

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Krefeld, Germany

Karl H Hermann