Basf Aktiengesellschaft

Bernhard Seid

Hans D Zettler

Heinz Berbner

Klaus Ebel

Ludwig Schuster

Volker Kiener

Heino Thiele

Frank P Woerner

Heinz Voelker

Josef Wallner

Klaus Schlueter

Werner Weber

Michael Kuczaty

Guenther Nonn

Harald Schewski

Karl Buellmeyer

The continuous preparation of melamine/formaldehyde precondensate solutions is carried out by a process in which melamine, formaldehyde and, if required, modifiers and/or additives are metered into a continuous mixer, and the homogeneous mixture is passed into a single-screw or twin-screw extruder, condensed at elevated temperatures, cooled and extruded.

Continuous preparation of aqueous melamine/formaldehyde precondensate

Solutions of low viscosity solvents and high viscosity, pasty products, for example water and sodium dithionite formulations, are prepared in a continuous manner in a matter of seconds in static and dynamic mixers connected in series while at the same time the ingress of air is avoided.

Continuous preparation of solutions of low viscosity solvents and high

A sheet-like packing material consisting of

Sheet-like packing material of melamine or phenol resin fibers

A mixing head for multicomponent plastics, especially polyurethane, in whose mixing chamber (2) a hollow piston (7) can be moved to and fro to control the component streams. The hollow piston contains an expulsion piston (8), which is movable independently of the hollow piston, and which can be passed through an outlet tube (3) which adjoins the outlet orifice (4). The end face (12) of the hollow piston forms, together with the mixing chamber wall (11) nearest the sprue, a shearing gap in which the components are mixed. As a result of the design and arrangement of the pistons (7) and (8), good mixing is achievable even under critical conditions, and the mixing chamber is also easily cleaned.

Mixing apparatus for multi-component plastics, especially polyurethane

Process for the manufacture of .alpha.-naphthol by hydrolyzing .alpha.-naphthyl esters of aliphatic carboxylic acids in a distillation column by means of steam in counter-current at a particular temperature, and in a certain ratio, in the presence of organic sulfonic acids. The .alpha.-naphthol obtainable by the process of the invention is a valuable starting material for the manufacture of dyes, drugs and insecticides, e.g. .alpha.-naphthyl N-methylcarbamate.

Manufacture of .alpha.-naphthol

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Frankenthal, Germany

Bernhard Seid