Process for strengthening geological formations

US4965292A · kind A · utility

Assignees

• BAYER HEALTHCARE LLC · DE
• Bergwerksverband GmbH · DE

Inventors

• Hanns P. Muller · Leverkusen, DE
• Manfred Kapps · Bensberg, DE
• Peter Vehlewald · Leichlingen, DE
• Frank Meyer · Essen, DE
• Wolfgang Cornely · Gladbeck, DE
• Hans Mehesch · Essen, DE

Key dates

• Filing date: Nov 17, 1989
• Grant date: Oct 23, 1990
• Expiry date: Nov 17, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08K5/549
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for strengthening geological formations in underground mining or underground construction work by the introduction of reaction mixtures which react to form polyurethane plastics into the formations which are required to be strengthened, wherein the reaction mixtures are based on PA1 (a) a polyisocyanate component, PA1 (b) a polyol component and PA1 (c) at least one auxiliary agent or additive, characterized in that component (c) contains a cyclic polydimethylsiloxane in the molecular weight range of 222 to 740 and in a quantity of about 0.01 to 5.0% by weight, based on the total weight of components (a) and (b).