Patent ID: 9469798
Filing Date: 2016-10-18
CPC Classification: C08G,C09J,E21D,E21F

Claim Text:
1. A mine seal comprising a wall of rigid blocks and an adhesive composition, wherein the rigid blocks are adhered to each other using the adhesive composition, the wall comprising an upper surface adjacent a roof of a mine shaft and two sides, each side of the wall being adjacent to a vertical wall portion of the mine shaft, wherein the adhesive composition is formed by: providing an aromatic isocyanate with an NCO content of between 15% and 35% by weight; preparing a first prepolymer by mixing the aromatic isocyanate and a polyol; providing an aliphatic isocyanate with an NCO content of between 8% and 24% by weight; preparing a second prepolymer by mixing the first prepolymer with the aliphatic isocyanate; providing an amine functional resin comprising a secondary amine; mixing the second prepolymer and the amine-functional resin to form a castable adhesive composition.