Inorganic plastic cements and process for the preparation thereof

Claim 1

THE ARTICLE OF MANUFACTURE WHICH COMPRISES A HIGH STRENGTH SUBSTANTIALLY WATER INSOLUBLE CURED INORGANIC PLASTIC CEMENT WITH THE SYSTEM SELECTED FROM THE GROUP CONSISTING OF WATER INSOLUBLE MAGNESIUM OXYSULFATE AND MAGNESIUM OXYCHLORIDE AS A MAJOR PHASE AND ONLY TRACE AMOUNTS OF WATER SOLUBLE SULFATE-HYDROXIDE AND CHLORIDEHYDROXIDE PHASES RESULTING FROM THE CURING OF AN INORGANIC PLASTIC CEMENT SLURRY PREPARED BY MIXING BY HIGH SHEAR BLENDING (A) A MAGNESIUM SALT SELECTED FROM THE GROUP CONSISTING OF MAGNESIUM CHLORIDE AND MAGNESIUM SULFATE IN THE PRESENCE OF SUFFICIENT WATER TO PRODUCE A HIGHLY CONCENTRATED SOLUTION OF THE MAGNESIUM SALT SUCH THAT WATER SOLUBLE PHOSPHATE SALTS WILL NOT DISSOLVE IN A SILUTION OF THEMAGNESIUM SALT AND WATER OF THAT CONCENTRATION AND (B) FINELY DIVIDED, ACTIVE MAGNESIUM OXIDE WHICH IS REACTIVE WITH THE MAGNESIUM SALT, SO AS TO DEAGGLOMERATE AND DEFLOCCULATE THE MAGNESIUM OXIDE AND TO UNIFORMLY DISBURST THE MAGNESIUM OXIDE AND MAGNESIUM SALT SOLUTION, TO PRODUCE A LOW VISCOSITY INORGAIC CEMENT SLURRY.