Aqueous suspension vehicle useful in suspension polymerization system for spheres

Claim 1

AN AQUEOUS SUSPENSION VEHICLE USEFUL IN SUSPENSION POLYMERIZATION OF A STYRENE-MONOMER IN THE PRESENCE OF A STYRENEMONOMER-POLYMERIZATION EFFECTIVE AMOUNT OF A STYRENEMONOMER-POLYMERIZATION FREE RADICAL-PROVIDING CATALYST, WHICH SUSPENSION CONSISTS ESSENTIALLY OF (A) WATER AND DISSOLVED THEREIN (B) A WATER-SOLUBLE SUSPENDING AGENT INERT TO REACTION WITH STYRENE, WHICH IS AT LEAST ONE OF (I) A HYDROXYETHYLCELLULOSE HAVING A VISCOSITY WITHIN THE RANGE OF ONE WHOSE 2 PERCENT BY WEIGHT, ON DRY BASIS, AQUEOUS SOLUTION AT 20*C. HAS A HOOPLER VISCOSITY OF FROM 6175 TO 7600 CENTIPOISES, (II) A HYDROXYETHYLCELLULOSE WHOSE SUCH 5 PERCENT AQUEOUS SOLUTION AT 20*C. HAS A HOOPLER VISCOSITY OF FROM 120 TO 160 CENTIPOISES, (III) CARBOXYMETHYLCELLULOSE, (IV) POLYACRYLIC ACID, (V) POLYMETHACRYLIC ACID, (VI) THE SODIUM OR AMMONIUM SALT OF ANY OF THE CARBOXYLIC ACID SUBSTANCES (III), (IV), AND (V), AND (VII) POLYVINYL ALCOHOL; SAID SUSPENDING AGENT BEING PRESENT IN A CONCENTRATION ABOVE THAT WHICH WILL ALLOW THE PRODUCED STYRENE-POLYMER TO AGGLOMERATE UNDER THE POLYMERIZATION CONDITIONS AND BELOW ABOUT 0.4 WEIGHT PERCENT, AND (C) FROM ABOUT 0.01 TO ABOUT 0.5 PERCENT OF A WATER-SOLUBLE ORGANIC SOLVENT FOR SAID SUSPENDING AGENT, WHICH SOLVENT IS SELECTED FROM THE GROUP CONSISTING OF FORMIC ACID, DIMETHYLFORMAMIDE, DIMETHYL-ACETAMIDE, TETRAHYDROUFURAN, ETHYLENEDIAMINE, DIETHYLENETRIAMINE, 2-BROMOPYRIDINE, AND 3-CYANOPYRIDINE.