Process for strengthening geological formations

US4792262A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Manfred Kapps · Bensberg, DE
• Max Mann · Odenthal, DE
• Peter Vehlewald · Leichlingen, DE
• Frank Meyer · Essen, DE
• Hans Mehesch · Essen, DE
• Wolfgang Cornely · Gladbeck, DE
• Birgit Riecks · Essen, DE

Key dates

• Filing date: Aug 20, 1986
• Grant date: Dec 20, 1988
• Expiry date: Aug 20, 2006

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K17/30
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The present invention is directed to a process for strengthening geological formations in underground mining or other operations introducing into the formation which is to be strengthened mixtures of a polyisocyanate component (a) and a polyol component (b) which react together to form polyurethanes, characterized in that the polyol component (b) is based on mixtures of (i) organic polyhydroxyl compounds having hydroxyl numbers of about 100 to 600 and (ii) dihydric alcohols having a molecular weight of 62 to about 150, component (ii) being present in an amount of about 0.01 to 20% by weight, based on the total quantity of component (b).