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Herein described is a method for the formulation of highly water soluble materials in a water soluble ‘non-solvent’. The example of potassium nitrate is presented along with data describing the synergy between an ethoxylated / propoxylated block copolymer, a tristyryl phenol ethoxylate, and disodium dodecyl diphenyloxide disulfonate. Data on viscosity, particle size, syneresis, and flowability, before and after aging at room temperature and 50°C for four weeks show a clear region of optimal performance which was verified by use of a simple statistical design of experiment. The concentrate described, with a loading level of 65% by mass, remains f1owable with minimal crystal growth after aging more than one year at room temperature.
suspension concentrate, water soluble, non-aqueous, crystal growth, Ostwald ripening, temperature coefficient of solubility, fertilizers, potassium nitrate, tristyryl phenol ethoxylate, disodium dodecyl diphenyloxide disulfonate
Team Leader, Agricultural Technical Development, Rhône-Poulenc Surfactants and Specialties, Cranbury, NJ
Senior Research Assistant, Agricultural Technical Development, Rhône-Poulenc Surfactants and Specialties, Cranbury, NJ