Stable concentrates and emulsions of water-insoluble organic pesticides

A pesticidal formulation concentrate that can be diluted with water to form a stable oil in water emulsion, said concentrate comprising (1) a water insoluble organic pesticide;

• (2) an RPS/GRAFT copolymer comprised of a pH independent reactive polymeric surfactant and at least one nonionic hydrophobic monomer;
• and (3) a cosolvent;
• wherein
• the continuous phase is non-aqueous;
• said copolymer comprises a hydrophilic ionic main chain with pendant hydrophobic nonionic graft chains;
• said copolymer spontaneously aggregates to form non-dissociating polymeric micelles;
• the grafted hydrophobic side chains are present in an amount sufficient so that the graft copolymer is insoluble in water and sufficient to provide compatibility with the oil phase and provide stability to the emulsion;
• the number and length of the grafted hydrophobic side chains are sufficiently small so that reversible phase inversion occurs upon addition of water to the concentrate.