Abstract: Liquid melts of dicarboxylic acid have a tendency to undergo unwanted discoloration on prolonged storage. By means of a solution of the dicarboxylic acids in a lactam of an aliphatic .alpha.,.omega.-aminocarboxylic acid, the discoloration can be avoided.

Abstract: A process for the batch preparation of polylaurolactam in the melt, involving introducing molten, anhydrous laurolactam at a temperature of up to 280.degree. C. into a pressure-resistant reactor heated externally to a maximum of 290.degree. C.; introducing steam having a temperature in the range from 170.degree. to 280.degree. C. and a pressure in the range from 8 to 64 bar into the laurolactam until the laurolactam is heated under pressure to a temperature in a range from 280.degree. to 290.degree. C., to give a ring opened precondensed product; and, if desired, after release of pressure, polycondensing the ring opened precondensed product.

Abstract: A process for the homogeneous incorporation of a stabilizers into a polycondensate in which the stabilizer is first applied to a finely divided solid polycondensate and the mixture is then revolved in the solid phase of the polycondensate, at temperatures of at least 80.degree. C.Products having an improved color and stability are obtained by this mild incorporation of stabilizer.

Abstract: Plasticizers are homogeneously incorporated into finely divided solid polyamides by mechanically agitating a mixture of plasticizers and polyamides at temperatures of at least 80.degree. C. while the polyamide remains in the finely divided solid phase.

Abstract: Liquid-melt aliphatic dicarboxylic acids tend to undergo undesirable discoloration during prolonged storage. The discoloration can be avoided by an addition of 0.1 to 3.0% by weight of a primary amine.

Abstract: The production of high impact strength molding compositions obtained by thermal treatment of synthetic resin mixtures containing predominantly polyalkylene terephthalate, in the solid form, characterized in that the synthetic resin mixture containsA. 70-95% or 60-97% by weight of polyalkylene terephthalate andB. when A is 70-95%, 5-30% by weight of a conventional, elasticizing acrylate graft copolymer, a conventional .alpha.-olefin copolymer or a conventional polyether amide, or when A is 60-97%, 3-40% of a conventional polyether ester amide,and that the synthetic resin mixture is treated at temperatures of 15.degree.-60.degree. C. below the melting point of the pure component A in an inert gas atmosphere.

Abstract: A precipitation procedure for preparing pulverulent coating compositions of high molecular weights by post condensation and based on polyamides having at least ten aliphatically bound carbon atoms per carbonamide group. The starting materials are uncontrolled polyamides having a relative solution viscosity of between 1.7 and 2.0 (measured in 0.5% meta cresol solution at 25.degree. C.) and contain not more than 0.2% by weight of phosphoric acid. After the cooling stage of the precipitation step of the polyamides, from 0.3 to 1.2% by weight of phosphoric acid referred to the polyamide are dispersed in the suspension prior to the precipitation in the solution or after the precipitation stage.

Abstract: Coating powders for the melt film coating method, based on polyamides and adhesion improving additives. The polyamides are aliphatic homo- and/or copolyamides having at least six carbon atoms containing functional groups consisting of at least 80% of primary, secondary, or mixtures of primary and secondary amino groups. As the adhesion improving additive there is added from 0.1 to 10% by weight referred to the polyamides of an isophoronediisocyanate capped with lactams, an isophoronediisocyanate capped with acetonoxime or an isophoronediisocyanate capped with an oligomer of acetonoxime.

Abstract: An improved process for preparing pulverulent coating compositions pigmented with titanium dioxide and based on polyamides having at least ten aliphatically bound carbon atoms per carbonamide group using the precipitation method. The titanium dioxide pigments used are without nucleating effects or only have weak nucleating effects on the polyamide precipitation. The pigments have nucleating effects less than or equal to 3.degree. C. where .DELTA.T=(T.sub.max p)-(T.sub.o). T.sub.max p is the maximum temperature at which precipitation takes place in a solution of polyamide having pigment therein and T.sub.o is the maximum temperature at which precipitation takes place in polyamide solution having no pigment therein.

Abstract: Polyamide based coating powders having a practically uniform grain size distribution are prepared employing the precipitation procedure provided that the polyamide is dissolved in ethanol at 127.degree. to 135.degree. C. and that the solution is cooled while distilling the ethanol in such a manner that the reactor jacket temperature does not drop below the temperature of the reactor contents until the end of the precipitation stage.

Abstract: The invention concerns an improved precipitation process in the manufacture of coating powders based on polyamides having at least ten aliphatically bound carbon atoms per carbonamide group. Rapid cooling takes place with stirring mainly by distilling the ethanol solvent until the temperature of precipitation is set in the range from 90.degree. to 113.degree. C. With the beginning of the saturation limit (about 125.degree. C.), the temperature difference between the coolant in the jacket and the solution inside is maintained at most at .+-.3.degree. C. The solution is maintained during the precipitation stage at constant temperature (isothermal procedure) by further distillation of the ethanol.

Abstract: Block copolyester amides having improved properties are applied as thermoplastic adhesives to textiles. Their melting points are between 80.degree. and 135.degree. C. and the block copolyester amides are prepared by polycondensing:(A) 60 to 95% by weight of a block polyester having terminal hydroxy groups and consisting of at least 50 molar % of the acid proportion of terephthalic acid and 40 to 90 molar percent of an alcohol proportion of 1.4-butanediol and 60 to 10 molar percent of 1.6-hexanediol, wherein up to 10 molar percent referred to 1,6-hexanediol can be replaced by aliphatic diols with longer chains; and(B) 40 to 5% by weight of a block polyamide dicarboxylic acid having a mean molecular weight M.sub.n between 1,000 and 8,000 and obtained from omega-amino-carboxylic acids or lactams having 6 to 12 carbon atoms or their mixtures with aromatic or aliphatic dicarboxylic acids.

Abstract: Improved molding compositions based on high-molecular polyether ester amides are obtained by heating at 180.degree.-250.degree. C. a melt containing a mixture ofA. a polyether ester amide having a relative solution viscosity .eta..sub.rel of at least 1.5; andB. 0.05-1.5 parts by weight, based on 100 parts by weight of the molding composition, of a cyclic, trimerized isophorone diisocyanate or an oligomer thereof having a degree of oligomerization of 2-5 and an isocyanate functionality of 3-7.

Abstract: Copolyether ester amides having a melting point between about 85.degree. and 140.degree. C. from:(A) lactams of omega-aminocarboxylic acids and/or equivalent amounts of dicarboxylic acids and diamines as polyamide-forming compounds; and(B) dicarboxylic acids and polyalkylene oxide diols as polyether ester forming compounds as thermoplastic adhesives for heat sealing textiles, wherethe polyamide forming compounds consist of at least 30% by weight of lauryllactam and the remaining compounds together with lauryllactam result in copolyamides which have melting points which lie in the range between about 90.degree. to 150.degree. C.;aliphatic dicarboxylic acids are used as the dicarboxylic acids; andcomponents A and B are used in the weight ratio from 93/7 to 35/65.

Abstract: Method for manufacturing polyether ester amides by polycondensing at ordinary or reduced pressure, optionally in the presence of catalysts. A hot melt of:(a) polyamides having carboxyl end groups with polyethers having hydroxyl end groups and amino end groups;(b) polyamides having carboxyl end groups and polyethers having hydroxyl end groups;(c) polyamides having carboxyl end groups with polyethers having amino end groups; or(d) polyamides having amino end groups with polyethers having carboxyl end groups;is treated at temperatures from about 200.degree. to 300.degree. C. and at a water vapor pressure of about 5 to 25 bars with mechanical agitation and after water is removed by decompression the polycondensation of the polyether ester amide is carried out.

Abstract: Copolyether ester amides having a melting point between about 85.degree. and 140.degree. C. are produced from:(A) lactams or omega-aminocarboxylic acids and/or equivalent amounts of dicarboxylic acids and diamines as polyamide-forming compounds; and(B) dicarboxylic acids and polyalkylene oxide diols as polyether ester forming compounds as thermoplastic adhesives for heat sealing textiles, wherethe polyamide forming compounds consist of at least 30% by weight of lauryllactam and the remaining compounds together with lauryllactam result in copolyamides which have melting points which lie in the range between about 90.degree. to 150.degree. C.;aliphatic dicarboxylic acids are used as the dicarboxylic acids; andcomponents A and B are used in the weight ratio from 93/7 to 35/65.

Abstract: The process for preparing thermoplastic polyether amides or polyether ester amides from lactams, dicarboxylic acids and polyethers having hydroxyl end groups and amino end groups or polyethers having amine end groups is improved.First, a mixture of lactams having at least 8 C atoms with dicarboxylic acids is melted in a molar ratio of 100/7 to 100/120 at temperatures of 230.degree. to 300.degree. C. while being mechanically mixed, in an inert gas atmosphere at ordinary pressure and in the absence of water, until the lactams have been reacted to at least 99%. Then, the polyether bearing the hydroxyl end groups and/or the amino end groups is added in a molar ratio of 1/0.95 to 1/1.05, based on the amount of dicarboxylic acid contained in the molten mixture. Homogenizing is then carried out with further mixing at 230.degree. to 290.degree. C. Lastly, a polycondensation is carried out to completion at 250.degree. to 290.degree. C.

Abstract: Method for manufacturing polyether ester amides by polycondensing at ordinary or reduced pressure, optionally in the presence of catalysts. A hot melt of:(a) polyamides having carboxyl end groups with polyethers having hydroxyl end groups and amino end groups;(b) polyamides having carboxyl end groups and polyethers having hydroxyl end groups;(c) polyamides having carboxyl end groups with polyethers having amino end groups; or(d) polyamides having amino end groups with polyethers having carboxyl end groups;is treated at temperatures from about 200.degree. to 300.degree. C. and at a water vapor pressure of about 5 to 25 bars with mechanical agitation and after water is removed by decompression the polycondensation of the polyether ester amide is carried out.

Abstract: A process for preparing polyether amides of polyether ester amides by polycondensing polyamides bearing carboxyl end groups with polyethers bearing hydroxyl end groups and/or amino end groups at ordinary or reduced pressure, in the presence of catalysts, the polyamides bearing the end groups and the polyethers bearing the end groups first being treated at temperatures from about 200.degree. to 300.degree. C. at a water vapor pressure of 5 to 25 bars and with mechanical agitation, and wherein upon removing the water by expansion, the polycondensation is carried to completion. The present invention differs from the prior art in that the polyamides bearing carboxyl groups being used are prepared by melting a mixture of lactams having at least 8 C atoms with dicarboxylic acids in the molar ratio of 100/1 to 100/15 in the presence of a catalyst, in an inert gas atmosphere, at atmospheric pressure and in the absence of water at temperatures from 230.degree. to 300.degree. C.

Abstract: Molding compositions comprisingA. 60-97% by weight, based on the weight of the total composition, of a poly(alkylene terephthalate) andB. 3-40% by weight, based on the weight of the total composition, of a polyether ester amide, component A being the condensation product of(1) 80-100 molar percent of terephthalic acid, and(2) 0-20 molar percent of another hydrocarbonaromatic-,cycloalkane- or alkane-dicarboxylic acid of 6-36 C atoms, with(3) 80-100 molar percent of a 1,n-alkanediol of 2-4 C atoms, wherein n is an integer of 2 to 4, and(4) 0-20 molar percent of another alkane- or cycloalkane-diol of 3-12 C atoms, component B being the condensation product of(1) at least one polaymide-forming .omega.