Deutsche Texaco Aktiengesellschaft

Friedrich Josten

Martin Cherubim

Karl-Heinz Heinemann

Rainer Striso

Karl-Heinz Renkes

A process for preparing bonding agents for light-colored weatherproof wood materials, based on alkali-condensed phenol-formaldehyde mixed condensates.

Process for preparing bonding agents for light-colored weatherproof wood

An improved method of manufacturing shaped objects from cement wherein cement is wetted with an aqueous solution of an acetone-formaldehyde resin, optionally including a water-soluble alcohol, the wet mixture molded to the desired shape and then cured preferably at a temperature within the range of 30.degree. C to 100.degree. C, wherein the bending strength of the finished product is improved by incorporating a metal soap in the composite prior to molding the wet mixture. Also disclosed is an improved composition of matter comprising Portland cement, an acetone-formaldehyde resin and a metal soap, and optionally containing an inorganic aggregate.

Method for manufacturing heat-cured molded articles from cement

Molding compositions or masses comprising sand and a two-component binder system are prepared. These two-component binders consist essentially of 1) polyisocyanate and 2) a low molecular weight polymethylol produced by the controlled condensation of narrow mole ratios of acetone and formaldehyde under alkaline reaction conditions followed by acidification and removal of sufficient water to produce a minimum solid content of at least 95%. These molding compositions cure so fast that they may be taken off the mold five minutes after having been cured with an amine curing agent, and reach a substantial bending strength within minutes of curing compared to prior art compositions which achieve comparable bending strength only after a period of as long as one hour.

Molding compositions or masses suitable for manufacturing foundry molds

Improved resin solutions derived from phenol-acetone-formaldehyde co-condensates useful as binder in weather-proof wood materials and a process for the production of said solutions.

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Friedrich Josten