Chemische Werke Huls Aktiengesellschaft

Huls Aktiengesellschaft

Heinz Scholten

Rainer Feldmann

Anton Capelle

Roland Feinauer

Hans J Panoch

Hans-Joachim Panoch

Wolfgang H Muller

Jorn Ruter

Wolfgang Kriesten

Klaus Rindtorff

Werner Boxkes

Karl Adolf Muller

N-methylmorpholine-N-oxide is prepared by reacting the azeotrope of methylmorpholine and water with an aqueous solution of hydrogen peroxide. The reaction solution product is thereupon concentrated to the desired content in N-methylmorpholine-N-oxide.

Process for producing aqueous N-methylmorpholine-N-oxide solutions

A separation of mixtures of water and 2,6-dimethylmorpholine is carried out by rectifying the mixtures at a pressure at the head of the column between 6 and 150 mbars. The separated 2,6-dimethylmorpholine has a maximum water content of 500 ppm by weight and it is possible to achieve for a corresponding design of the rectification water contents of less than 1 ppm by weight of dimethylmorpholine.

Dehydrating 2,6-dimethylmorpholine

Powdered polyamide mixtures for use in the heat sealing of textiles by the powder point process. The polyamide homogeneous mixtures contain: (a) about 95 to 40% by weight of at least one copolyamide with a melting point of at least about 110.degree. to 140.degree. C. and having a proportion of a basic lauryllactam monomer component of at least 20% and at most 70% by weight; and (b) about 5 to 60% by weight of at least one copolyamide with a melting point between about 80.degree. to 110.degree. C. and having a proportion of a basic lauryllactam monomer component or lauryllactam and 11-aminoundecanoic acid copolymer of at least 25% and at most 70% by weight, where the percentages are based on the total weight of the copolyamide mixtures.

Powdered mixture of polyamides for heat sealing by the powder point

Hot-melt adhesives for articles which come into contact with organic fuels for internal engines comprising binary copolyamides having:

Hot-melt adhesive copolyamide having resistance to engine fuels

Method of spot coating garment interlinings comprising a suspension agent for synthetic resin powders comprising an aqueous emulsion wherein there is contained, in a concentration of about 1-7.5 percent by weight:

Suspension agent for synthetic resin powders

Suspension agent for synthetic resin powders comprising an aqueous emulsion wherein there is contained, in a concentration of about 1-7.5 percent by weight:

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. and below the melting point of the polyamide to relative viscosity value of between 1.55 and 1.65; and finally the powders obtained are brought to a particle size distribution of between greater than 60 and less than 350 microns. B. For the production of pigmented polylaurolactam powders, the low molecular weight granules are treated at temperatures of between 110.degree. and 140.degree. C. and pressures of between 5 and 8 bars with the addition of pigments in primary aliphatic alcohols having 1-3 carbon atoms, cyclohexanol, or ethylbutanol, these granules having a relative viscosity of between 1.25 and 1.65 and likewise having been obtained 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 powders are obtained with gradual cooling to room temperature with a minimum of mechanical motion and these powders are dried, optionally screened and, if necessary, the thus-extracted granules or the dried powders are brought to relative viscosity value of between 1.55 and 1.65 by subsequent condensation at temperatures of between 140.degree. C. and below the melting point of the polyamide.

Method for producing polylaurolactam powder compositions for the coating

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. and below the melting point of the polyamide to relative viscosity value of between 1.55 and 1.65; and finally the powders obtained are brought to a particle size distribution of between greater than 60 and less than 350 microns. B. for the production of pigmented polylaurolactam powders, the low molecular weight granules are treated at temperatures of between 110.degree. and 140.degree. C. and pressures of between 5 and 8 bars with the addition of pigments in primary aliphatic alcohols having 1 - 3 carbon atoms, cyclohexanol, or ethylbutanol, these granules having a relative viscosity of between 1.25 and 1.65 and likewise having been obtained 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 powders are obtained with gradual cooling to room temperature with a minimum of mechanical motion and these powders are dried, optionally screened and, if necessary, the thus-extracted granules or the dried powders are brought to relative viscosity value of between 1.55 and 1.65 by subsequent condensation at temperatures of between 140.degree. C. and below the melting point of the polyamide.

Additives for textile hot melt adhesives based on copolyamides comprising, based on the total weight of copolyamide: A. 0.05 - 2 percent by weight of at least one acid amide of the general formula ##STR1## wherein R represents a saturated or unsaturated aliphatic hydrocarbon group of 12-20 carbon atoms, R.sub.1 represents an alkyl group of 1 to 3 carbon atoms, and n represents an integer of between 3 and 6; and B. 0.05 - 2 percent by weight of a mixture of differently condensed aminoalkyl phenols of the general formula ##STR2## wherein N' CAN ASSUME THE VALUE OF 0.5 - 2, m can assume the value of 2 - 6, and R' represent an aliphatic hydrocarbon group of 8-10 carbon atoms which is in the ortho- or para-position with respect to the OH-group.

Additive for improving the adhesion to textiles of hot melt adhesives

A powdery coating composition suitable for coating metallic surfaces at high temperatures, comprising powdery particles of a saturated, high-molecular weight thermoplastic polyester having an RSV value of about 0.4-1.2 dl./g. having homogeneously dispersed throughout said particles about 0.1-5% by weight, based on the weight of the polyester, of a flow agent of the formula ##STR1## wherein N IS AN INTEGER OF 0-6;

Powdery coating composition

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.

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Haltern, Germany

Heinz Scholten