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

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

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

Abstract: 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.

Abstract: 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;R.sup.2 represents hydrogen, a C.sub.4 -C.sub.12 alkyl, C.sub.7 -C.sub.12 aralkyl or C.sub.5 -C.sub.12 cycloalkyl group and is in the o-, or p-position to the N-atom substitution;n represents an integer of from 1 to 29; andY is a divalent, non-mono-olefinically unsaturated radical having the same meaning as R.sup.2 and, in addition, may represent (in a proportion of up to 50 mole percent) --S--, --CH.sub.2 --S--CH.sub.2 --, --CH.sub.2 --O--CH-- or >CH--R.sup.4, wherein R.sup.4 represents H, C.sub.1 -C.sub.6 alkyl or C.sub.5 or C.sub.6 cycloalkyl, and may be in the o- or p-position to the N-atom substitution.

Abstract: 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.

Abstract: 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 formulaA--CH.sub.2 --BA and B have the abovementioned meaning,are oxidized with oxygen in the presence of a nucleophilic compound of the general formulaD--Hand in the presence of catalytic amounts of benzoquinones substituted by halogen or cyano or of phenanthrenequinones substituted by nitro, and in the presence of catalytic amounts of nitrogen oxides--with the exception of dinitrogen monoxide--or of substances which produce such nitrogen oxides under the reaction conditions.

Abstract: 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 orR.sup.1 and R.sup.2, together or with the ortho-position of the phenyl ring, form a heterocyclic ring and R.sup.1 can additionally represent hydrogen,R.sup.3 and R.sup.4 denote hydrogen or non-ionic substituents,n represents an integer from 1 to 4 andX.sup.- denotes an anion,by a one-pot process, an aldehyde of the general formula ##STR2## in which R.sup.4 and n have the abovementioned meaning,is subjected to a condensation reaction with an aromatic amine of the general formula ##STR3## in which R.sup.1, R.sup.2, R.sup.

Abstract: 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 andn represents a number between 1 and 4, andR.sub.1 and R.sub.2 represent hydrogen or alkyl, aryl or aralkyl which is optionally substituted by non-ionic or acid groups, or together, or with the o-position of Ar, form a heterocyclic ring,D denotes hydrogen, alkyl, aryl which is optionally substituted by neutral or acid groups, or a hetero-aromatic radical andX.sup.

Abstract: Cationic dyestuffs of the formula ##STR1## wherein R.sub.1 represents a lower alkyl, alkenyl or hydroxyalkyl radical,R.sub.2, R.sub.3, R.sub.5 and R.sub.6 represent hydrogen or a lower alkyl or alkenyl radical,R.sub.4 represents a lower alkyl, alkenyl or alkoxy radical andX.sup.- represents an anion,are suitable for dyeing and printing natural and synthetic materials, in particular polyacrylonitrile and acid-modified polyamides and polyesters.

Abstract: 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.

Abstract: 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,X and Y denote ##STR2## and R.sub.13 and R.sub.14 denote hydrogen, alkyl, halogenoalkyl, cyanoalkyl, cycloalkyl, aryl or aralkyl,and whereinX and R.sub.2, Y and R.sub.10, R.sub.1 and R.sub.2, R.sub.5 and R.sub.6, and R.sub.9 andR.sub.10 can form a 5-membered or 6-membered ring andA.sup.(-) denotes an anion,can be obtained in excellent purity when the hot reaction melts obtained by known processes are introduced into a two-phase system consisting of water and an organic solvent which is not water-miscible or which is water-miscible to a limited extent, and the dyestuffs are separated off.