Polyurethane-hydraulic cement compositions and process for manufacturing the same

Claim 1

A PROCESS OF MANUFACTURING A POLYURETHANE-HYDRAULIC CEMENT BODY WHICH COMPRISES: MIXING DRY HYDRAULIC CEMENT PARTICLES WITH A PARTIALLY REACTED MIXTURE OF AT LEAT ONE ORGANIC POLYFUNCTIONAL ISOCYANATE COMPOUND WHEREIN THE FUNCTIONAL GROUPS ARE ISOCYANTO RADICALS AND AT LEAST ONE POLYFUNCTIONAL COMPOUND EACH OF THE FUNCTIONAL GROUPS OF WHICH CONTAINS AN ACTIVE HYDROGEN ATOM AND CAPABLE OF FORMING A POLYURETHANE; FORMING SAID MIXTURE INTO A DESIRED SHAPE; EXPOSING SAID MIXTURE TO GAS CONTAINING WATER VAPOR AT A TEMPERATURE OF FROM 15 TO 100*C., THE QUANTITY OF WATER VAPOR IN SAID GAS BEING AT LEAST THAT OF A SPECIFIC HUMIDITY OF AT LEAST 50% AND BEING NOT GREATER THAN 200 GRAINS PER POUND OF DRY AIR, SAID WATER VAPOR PERMEATING SAID MIXTURE AND REACTING WITH ISOCYANATO RADICALS ON SAID ISOCYANATE COMPOUND SO AS TO YIELD CARBON DIOXIDE GAS AND AMINES, THIS GAS CAUSING THE FORMATION OF GAS POCKETS WITHIN THE MIXTURE, THESE AMINES FURTHER REACTING SAID POLYFUNCTIONAL COMPOUNDS FURTHER REACTING DURING SAID EXPOSURE TO WATER VAPOR SO AS TO FORM A POLYURETHANE RESIN BODY STRUCTURE DURING SUCH EXPOSURE; HYDRATING SAID HYDRAULIC CEMENT PARTICLES WITHIN SAID BODY; AND DRYING SAID BODY AT A TEMPERATURE BELOW THE DECOMPOSITION TEMPERATURE OF HYDRATES FORMED FROM SAID HYDRAULIC CEMENT PARTICLES.