Process for strengthening geological formations

US4904125A · kind A · utility

Assignees

• BAYER HEALTHCARE LLC · DE
• Bergwerksverband GmbH · DE

Inventors

• Manfred Schmidt · Krefeld, DE
• Manfred Kapps · Bensberg, DE
• Max Mann · Odenthal, DE
• Peter Vehlewald · Leichlingen, DE
• Manfred Dietrich · Leverkusen, DE
• Frank Meyer · Essen, DE
• Wolfgang Cornely · Gladbeck, DE
• Hans Mehesch · Essen, DE

Key dates

• Filing date: May 8, 1989
• Grant date: Feb 27, 1990
• Expiry date: May 8, 2009

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E21D9/002
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

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 PA0 (a) a polyisocyanate component, PA0 (b) a polyol component and PA0 (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).