AQUEOUS SUSPENSION CONCENTRATE CONTAINING PENDIMETHALIN (N-(1-ETHYLPROPYL)-3,4-DIMETHYL-2,6-DINITROBENZENAMINE) AND SECONDARY PESTICIDES

摘要

The present invention relates to stable aqueous suspension concentrates or aqueous flowable compositions of the low-melting dinitroaniline pesticide, pendimethalin, alone or in combination with secondary pesticide(s) melting at temperatures greater than 70 DEG C or pesticides which are water soluble.Preferred compositions of the invention comprise on a weight to volume basis, about 5.0% to 50.0% pendimethalin; about 0% to 50% of one or more secondary pesticide(s); about 3.0% to 30.0% of coformulants, such as surfactants, dispersing agents, wetting agents, antifreezing agents, antifoaming agents, thickening agents, gums, preservatives and 20.0% to 92.0% water. The stable compositions of the invention are readily prepared by forming an emulsion of molten pendimethalin in water containing the coformulants, surfactants, dispersing and/or wetting agents, antifoaming agents and suspending agents. This emulsion has an average droplet size in a range of less than 2 microns to about 10 microns, preferably 2 microns to 6 microns. This is then cooled and optionally milled to obtain an average particle size of suspended particles of less than 20 microns, preferably less than 5 microns.