Rutgerswerke Aktiengesellschaft

Ruetgerswerke Aktiengesellschaft

Alois Kwasniok

Arno Gardziella

Peter Adolphs

Achim Hansen

Harald Heerdegen

Ralf Wetzig

Gerhard Janocha

A binding agent comprising 95 to 50% by weight of a furan resin, 5 to 50% by weight of lignin from the Organosolv process and organic and/or inorganic acid curing agents useful for the production of curable molding compositions, high temperature-stable molding substances and refractory products, especially casting cores and casting molds.

Novel low-emission, cold-curing binding agents

A granular molding material with a binder comprising a phenol novolac and a polyisocyanate which hardens upon addition of amine catalysts wherein the molar ratio of phenol to formaldehyde in the novolac is 1:0.25 to 1:0.5 and has the formula ##STR1## wherein R, R' and R' are individually selected from the group consisting of hydrogen, alkyl of 1 to 12 carbon atoms, hydroxy, cycloalkyl of 3 to 12 carbon atoms and an anellated ring and X is an integer from 0 to 4 or &gt;4 with the percent molar distribution based on X is as follows:

Novel molding materials

A heat-hardenable binder comprising (a) a phenolic resin of a phenolic compound and formaldehyde in a molar ratio of 1:1 to 1:2 and (b) an effective amount of a hardener mixture of hexamethylenetetramine and an acidic latent hardening agent with reduced emission problems and curing rapidly.

Novel heat-hardenable binders phenol-formaldehyde+HMT+acid

A binder material is disclosed formed from furfuryl alcohol suitable for the preparation of molded bodies and cores for molding for the foundry industry based on the following composition:

Furfuryl alcohol binders, methods for their production and use

Hardenable molding masses are disclosed containing an organic binder material, fillers and additives wherein the binder material after the shaping and hardening is pyrolytically decomposed. The development of harmful substances such as aromatic hydrocarbons is considerably reduced through the addition of a boron containing compound.

Growing community of inventors

Iserlohn, Germany

Alois Kwasniok