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AssigneesBayer Aktiengesellschaft, Bergwerksverband GmbH
InventorsManfred Schmidt, Manfred Kapps, Max Mann, Peter Vehlewald, Manfred Dietrich, Frank Meyer, Wolfgang Cornely, Hans E. Mehesch
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The present invention is directed to a process for the strengthening of geological formations in underground workings and mines by the introduction of reaction mixtures which react to form polyurethanes into the formations which are to be strengthened, the reaction mixtures being based on (a) a polyisocyanate component, (b) a polyol component and (c) an ester, the ester having a hydroxyl number of about 10 to 630 and an acid number of at most 10 and obtained from (i) an acid component having a carboxyl functionality of at least 1.5 and containing a polymerized fatty acid having at least 12 carbon atoms or mixtures thereof with unpolymerized saturated or unsaturated fatty acids having at least 12 carbon atoms and (ii) a polyol component containing at least one polyhydric alcohol, the ester being present in a positive amount of up to 5% by weight, based on the weight of component (b).
A process for strengthening geological formations and underground workings or mines by introducing a reaction mixture into the formation to be strengthened, the reaction mixture comprising
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