Process for consolidation and sealing of geological formations and artificial beds of rock, earth, and coal

US4475847A · kind A · utility

Assignees

• Bergwerksverband GmbH · DE
• BAYER HEALTHCARE LLC · DE

Inventors

• Wolfgang Cornely · Gladbeck, DE
• Hans Mehesch · Essen, DE
• Frank Meyer · Essen, DE
• Rolf Kubens · Odenthal, DE
• Martin Winkelmann · Leverkusen, DE

Key dates

• Filing date: Sep 24, 1982
• Grant date: Oct 9, 1984
• Expiry date: Sep 24, 2002

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E21D11/38
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

For consolidation of geological formations and artificial beds of rock, earth, and coal by means of foaming and hardening polyisocyanate/polyol blends, diols with secondary hydroxyl functions of the OH number range 150-1000 are used as diol component. Preferably a crude polyisocyanate blend (MDI) obtained by phosgenation of aniline/formaldehyde condensates which at ambient temperature assumes a liquid state, and the liquid prepolymers of said crude MDI are used as isocyanate components.