Patent ID: 7109267
Filing Date: 2006-09-19
Classification: A01N

Abstract:
1. A method of dispersing a solid active water-insoluble agrochemical principal in an aqueous solution comprising the following steps: (i) providing a formulation comprising at least one finely divided solid active water-insoluble agrochemical principal and at least one dispersant comprising a water soluble copolymer wherein said copolymer comprises a residue of a first comonomer and a residue of a second comonomer, wherein said first comonomer is acrylic or methacrylic acid and said second comonomer is an α-olefln having at least one polymerizable double bond and wherein at least one of said first comonomer and said second comonomer is substituted, wherein the substituents for said first comonomer are selected from the group consisting of esters, amides, thioesters and other functional groups derived from reaction with nucleophilic reagents and wherein the substituents for the second comonomer are selected from the group consisting of epoxides, sulfonates, esters, amides, and optionally substituted pendent aromatic and heteroaromatic groups wherein said optional substituents are selected from the group consisting of sulfonates, nitrates, phosphates and other substituents derived from reaction with electrophilic reagents; with the provisos that (a) when the second comonomer is sulphonated styrene or sulphonated isobutylene, the first comonomer is substituted, (b) when one of the first and second comonomers is substituted with an ester group containing a polvalkyleneoxy moiety, the other of the first and second comonomers must be substituted and (c) when the second comonomer is sulphonated styrene, the first comonomer is not alkyl acrylate or alkyl methacrylate; and (ii) dispersing said formulation in an aqueous medium to form a suspension of the at least one active water-insoluble agrochemical principal.