Potassium silicate solutions and their preparation

Claim 1

IN A PROCESS FOR PREPARING A POTASSIUM SILICATE SOLUTION ADAPTED FOR USE AS A SUSPENDING AND CEMENTING AGENT FOR PHOSPHORS, THE STEPS COMPRISING ADDING TO A POTASSIUM SILICATE SOLUTION A SOLULE SALT OF A POLYVALENT METAL, SAID SALT BEING SOLUBLE AT LEAST TO THE EXTENT OF 0.5% BY WEIGHT IN WATER AT 20*C. AND SAID METAL BEING SELECTED FROM THE GROUP CONSISTING OF ALUMINUM, BARIUM, CADMIUM, CALCIUM, COBALT, IRON, MAGNESIUM, NICKEL, STRONTIUM, TIN, ZINC AND ZIRCONIUM, IN THE AMOUNT OF 0.1 TO 1 MOL PERCENT OF THE METAL BASED UPON SIO2 IN THE POTASSIUM SILICATE SOLUTION, HEATING THE MIXTURE AT 80 TO 120*C. UNTIL NO FURTHER PRECIPITATE FORMS, AND FILTERING THE POTASSIUM SILICATE SOLUTION TO REMOVE THE PRECIPITATE.