Dynamit Nobel Aktiengesellschaft

Huls Aktiengesellschaft

Friedhelm Schnippering

Heinz Nestler

Werner Dittrich

Christine Fliedner

Walter Josten

Roland Edelmann

Reinhard Matthes

Karl-Martin Rodder

Reinhard Mattes

Karl-Martin Rodder, Deceased

A binder composition for storable zinc dust paints contains a mixture of silicic acid esters, solvents, curing agents, an antideposition agent, and a dearomatized aliphatic hydrocarbon mixture with an average molecular weight of 133. The binder composition has a flash point distinctly higher than 21.degree. C.

Binder for storable coating compositions

A binder composition for zinc dust paints contains silicic acid esters, solvents, curing agents, an anti-settling agent and n-butyl acetate. The composition has a flash point above 21.degree. C.

Binders for storage-stable coating compositions

The present invention relates to the production of molds for the casting of metal. The molds are made of refractory materials bound together by a binding agent on the basis of a partially hydrolyzed, partially condensed silicic acid ester. A slip consisting of binding agent and refractory material is applied to the model alternately with a granular refractory sanding material. In accordance with the invention, the granular refractory sanding material contains the agent for hardening the binding agent. The method of the invention makes possible the dimensionally accurate reproduction of even relatively large models, while the slip can be stored over a relatively long period of time without loss of its action.

Method of producing molds for the casting of metal

A process for the preparation of partial hydrolyzates of orthosilicic acid tetra(alkoxyalkyl) ester having a stable shelf life is described by hydrolysis of a silicic acid tetra(alkoxyalkyl) ester with water, suitably in the presence of an acid and optionally in the presence of a solvent, wherein the stoichiometrically necessary amount of water is present at the commencement of the reaction.

Process for the manufacture of partial hydrolysates of

A binder for a pigmentous composition containing a silicic acid ester which in turn contains at least one alkoxyalkyl group, a pigmentous composition, especially a zinc dust paint, comprising said binding agent and a paint composition comprising said binding agent and a resin preferably further containing a pigment.

Binding agent for coating compositions having a long shelf life

A ceramic molding composition comprising an alcoholate of aluminum or a metal of the fourth sub-group of the Periodic System, a refractory metal oxide and a polyvalent alcohol, an improvement in the formation of a ceramic product wherein a ceramic molding composition is shaped and hardened, which improvement resides in employing the above defined ceramic molding composition.

Process for the manufacture of refractory ceramic products

A ceramic molding composition comprising an alcoholate of aluminum or a metal of the fourth sub-group of the Periodic System, a refractory metal oxide and an agent selected from the group consisting of diketones of the formula ##STR1## wherein R.sub.1 and R.sub.2 are each independently an aliphatic radical of between C.sub.1 and C.sub.18 carbon atoms or an aromatic radical from C.sub.6 to C.sub.18 carbon atoms, a hydroxycarboxylic acid compound of the formula ##STR2## wherein R.sub.3 is an aliphatic radical of C.sub.1 and C.sub.18 or an aromatic radical from C.sub.6 to C.sub.18, and R.sub.4 is hydrogen or an alkyl radical of C.sub.1 to C.sub.4, and a polyvalent alcohol, an improvement in the formation of a ceramic product wherein a ceramic molding composition is shaped and hardened, which improvement resides in employing the above defined ceramic molding composition.

An improvement in a process for making a mold for metal casting by applying a fluid ceramic composition containing binding agent and finely divided refractory substance to a pattern and hardening the same, which improvement comprises employing a ceramic composition which contains special solvents, anti-setting and thixotropic agents, so that this composition after applying gives a uniform coat which does not run down from walls.

Growing community of inventors

Siegburg-Braschoss, Germany

Friedhelm Schnippering