Abstract: This invention relates to a process for the continuous extraction of polyamides, in which the residue of low molecular weight components left in the polyamide is very small. It also relates to a two-part extraction tube suitable for this purpose, in which the upper part is connected to the lower part by a transition tube of smaller diameter and a counterflow extraction is carried out in the upper part and a direct flow extraction in the lower part under particular conditions.

Abstract: This invention relates to thermoplastically deformable branched aliphatic polyamides prepared by the hydrolytic polycondensation of lactams in the presence of small quantities of .alpha.-amino-.epsilon.-caprolactam (ACL) and approximately equivalent quantities of polycarboxylic acids (preferably dicarboxylic acids) and to a process for their preparation which is distinguished by considerably reduced polycondensation times without giving rise to cross-linked products. The process optionally in addition employs a solid phase after-condensation in which rapid further condensation takes place to the products with increased melt viscosity which are branched but are still soluble in m-cresol.

Abstract: The reaction of--preferably partially crystalline--polyamides with monoisocyanate or monoisocyanate precursors gives products having improved flowability, mould release and/or notched impact strength.

Abstract: The invention relates to thermoplastic molding compositions showing improved properties, more especially improved dimensional stability and notched impact strength, particularly at low temperatures, in the form of a mixture of at least 35% by weight of a copolyamide containing polydiorganosiloxane carbonamide units and/or of a mixture of partly crystalline polyamides and (co)polyamides containing polydiorganosiloxane carbonamide units and from 1 to 65% by weight of graft products of vinyl polymers on rubbers.The invention also relates to the dimensionally stable molding compositions tough at low temperatures characterized above which additionally contain amorphous siloxane-free polyamides added in quantities of up to 64% by weight.

Abstract: Polyamide moulding materials which have been reinforced with unsized glass fibres and to which a flame-proof finish has been imparted by means of melamine or melamine cyanurate and which have a high glow wire resistance.

Abstract: Pulverulent red phosphorus stabilized with zinc fluoride and the use thereof as flame-retarding agent to thermoplastic moulding compositions.

Abstract: Phosphoric acid esters are produced by the method of phase-interface condensation by reacting phosphorus oxyhalides, phosphorus pentahalides, phosphoric acid monoester dihalides or phosphoric acid diester halides with hydroxyaryl compounds in the presence of aqueous alkaline earth metal and/or alkali metal hydroxide solutions and organic water-immiscible solvents.

Abstract: Phosphoric acid triesters of the formula ##STR1## are produced in two or more stages by reacting phosphorus oxyhalides, phosphorus pentahalides, phosphoric acid monoester dihalides or phosphoric acid diester halides corresponding to the following general formula:ZO PO Hal.sub.2 (ZO).sub.2 PO Halwherein Z is defined as above and Hal represents Cl and/or Br with at least one hydroxyaryl compound of the formula ##STR2## in a two-phase mixture of an organic solvent an aqueous alkaline earth metal and/or alkali metal hydroxide solution.

Abstract: A coating composition for polycarbonate surfaces comprising a mixture of:(A) 86% to 98% by weight of hydroxyl-group-containing copolymers with copolymerized units of:(a) 20% to 32% by weight of at least one aromatic vinyl monomer,(b) 8% to 18% by weight of at least one hydroxylalkyl ester of acrylic or methacrylic acid containing from 2 to 12 carbon atoms in the alkyl group, and(c) 50% to 70% by weight of at least one acrylic or methacrylic acid ester containing from 1 to 8 carbon atoms in the saturated aliphatic monoalcohol component and/or a mixture thereof; and(B) 2 to 14% by weight of at least one melamine resin.

Abstract: Polyester moulding and coating compositions based on polyester resins of:A. from 20 to 90% by weight based on the sum of components (A) and (B), of .alpha.,.beta.-ethylenically unsaturated polyesters, andB. from 80 to 10% by weight based on the sum of components (A) and (B) of polymerizable compounds, these polyester compositions containing, in addition to possible further additives,C. from 0.1 to 8.0% by weight based on the sum of components (A) and (B) of polymerization initiators,D. from 0.001 to 0.1% by weight based on the sum of components (A) and (B) of polymerization inhibitors,E. from 0.001 to 0.5% by weight, based on the sum of components (A) and (B), of conventional accelerators,F. from 0.05 to 5.0% by weight based on the sum of components (A) and (B) of additional accelerators, and optionally,G. from 0.01 to 1.