Chemische Werke Huls Aktiengesellschaft

Huels Aktiengesellschaft

Huls Aktiengesellschaft

Chemische Werke Huels Aktiengesellschaft

Huls Aktiengelsellschaft

Salih Mumcu

Rainer Feldmann

Hans J Panoch

Klaus Burzin

Gernot Horlbeck

Franz-Erich Baumann

Hans Jadamus

Roland Feinauer

Helmut Winzer

Horst Heuer

Hanns-Jorg Bax

Christian Gerth

Michael Droescher

Joern Rueter

Wolfgang Kriesten

Josef Bittscheidt

Hans P Aurich

Hasso Daebel

Weigand Kramer

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.

Liquid solutions of dicarboxylic acids

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.

Process for the batchwise preparation of polylaurolactam

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.

Process for incorporating stabilizer into polycondensates

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.

Process for incorporating a plasticizer into a polyamide

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.

Liquid-melt aliphatic dicarboxylic acids

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 contains

High impact strength molding compositions based on polyalkylene

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.

Process for preparing polyamide-based, pulverulent coating compositions

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.

Coating powders based on polyamide and adhesion improving diisocyanate

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.

Process for preparing polyamide based, titanium dioxide pigmented

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.

Process for preparing pulverulent coating composition based upon

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.

Process for preparing pulverulent coating composition of practically

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:

Application of block copolyester amides as thermoplastic adhesives for

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 of

Molding compositions based on high molecular weight polyether ester

Copolyether ester amides having a melting point between about 85.degree. and 140.degree. C. from:

Copolyether ester amides useful as thermoplastic adhesives for heat

Method for manufacturing polyether ester amides by polycondensing at ordinary or reduced pressure, optionally in the presence of catalysts. A hot melt of:

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Marl, Germany

Salih Mumcu