Abstract: Polylaurolactam powder coating compositions for the coating of metals at high temperatures are obtained by grinding low molecular weight and brittle polylaurolactam with subsequent condensation by heating of the powder to temperatures of below its melting point.A. For the production of pigment free polylaurolactam powders, the low molecular weight granules are ground at temperatures of between 0.degree. and 45.degree. C. which have a relative viscosity of between 1.25 and 1.45 (measured in a 0.5 percent mecresol solution at 25.degree. C.) and have been produced by the polymerization of laurolactam in the presence of 2-10 percent by weight of water, 0.3-0.7 percent by weight of phosphoric acid at temperatures of between 265.degree. and 300.degree. C. in the absence of chain stabilizers under internal pressure, with subsequent granulating, and extraction between 25.degree. and 70.degree. C. with methanol or ethanol. The subsequent condensation is conducted at temperatures of between 140.degree. C.

Abstract: An improved method of coating glass bottles by flame spraying with pulverulent copolyamides which uses a copolyamide containing at least 30% by weight of laurolactam. The copolyamides, obtained by the hydrolytic polycondensation process are first subjected to a molecule-orienting treatment, then ground into powders at low temperatures, and these powders are sifted to a particle size distribution so that the proportion of powder having a particle size of between 30 and 100 microns is greater than 70 to 100%, and the proportion of powder having a particle size of less than 30 microns is 0 to 30%.

Abstract: Polylaurolactam powder coating compositions for the coating of metals at high temperatures are obtained by grinding low molecular weight and brittle polylaurolactam with subsequent condensation by heating of the powder to temperatures of below its melting point.A. for the production of pigment free polylaurolactam powders, the low molecular weight granules are ground at temperatures of between 0.degree. and 45.degree. C. which have a relative viscosity of between 1.25 and 1.45 (measured in a 0.5 percent m-cresol solution at 25.degree. C.) and have been produced by the polymerization of laurolactam in the presence of 2 - 10 percent by weight of water, 0.3 - 0.7 percent by weight of phosphoric acid at temperatures of between 265.degree. and 300.degree. C. in the absence of chain stabilizers under internal pressure, with subsequent granulating, and extraction between 25.degree. and 70.degree. C. with methanol or ethanol. The subsequent condensation is conducted at temperatures of between 140.degree. C.

Abstract: The production of polyester amides based on dicarboxylic acids and/or the esters thereof, primary diamines, and polyhydric alcohols and/or aminocarboxylic acids or lactams, by poly-condensing the mixture under heating in the presence of water, while distilling off the volatile components, and recondensation under reduced pressure is improved so that colorless polyester amides are produced. In a first stage a monomer mixture is preliminarily condensed in the presence of about 3 - 20 percent of water, based on the sum total of the polyamide-forming components, under a pressure of about 14 - 25 bars, at temperatures of about 200.degree. - 300.degree. C and for a time period of about 4 - 12 hours. In a second stage, the mixture is completely condensed, after removal of the water, under a reduced pressure of about 0.01 - 100 mbar at temperatures of about 230.degree. - 300.degree. C and for a period of time of about 1 - 12 hours.

Abstract: Polylauryllactam having a low fisheye gel content, containing about 0.01 - 1.5 percent by weight of compounds of the general formula ##STR1## wherein Y is a sulfur or oxygen atom or an NH-group, based on the weight of polylauryllactam.

Abstract: Polyamide base powder coating material from a polyamide having an average of about 8 - 11 aliphatic carbon atoms per carbonamide group and containing about 0.2 to 5 percent by weight of carbonamide groups having n-alkoxymethyl groups based on the total number of carbonamide groups and about 0.01 - 2 percent by weight of acid catalysts.

Abstract: Polylauryllactam low in fisheye gel content polymerized at temperatures ranging from about 260.degree. to 340.degree.C and in the presence of water and possibly in the presence of monocarboxylic acids having 2-18 carbon atoms or polycarboxylic acids having 2-12 carbon atoms as chain regulators, under pressure and with removal of the water, and possibly with post-condensation at temperatures ranging from about 200.degree. to 300.degree.C, wherein 2-hydroxyphenylbenzoxazole is added to the molten, lauryllactam monomer in such amounts that the polylauryllactam contains from about 0.05 to 1.5 percent by weight of 2-hydroxyphenylbenzoxazole.