Patent NZ-741721-A (NZ)
Title: Solid herbicide compositions containing fluroxypyr-meptyl
Inventor: DAVE HITESHKUMAR
IPC: C07D213/73
Filed: 2015-10-26
Abstract: The present disclosure concerns herbicide granules and powders containing a high-load of fluroxypyr-meptyl. The granules exhibit good storage stability and good herbicidal efficacy when added to water and applied by spray application to control unwanted plant growth. It also concerns a coated herbicide powder comprising crystalline particles of fluroxypyr-meptyl coated with a mixture of surfactants comprising: a) a water soluble nonionic surfactant; and b) a water soluble anionic surfactant, wherein the powder comprises from about 350 grams active ingredient per kilogram (gai/kg) to about 800 gai/kg of fluroxypyr-meptyl, wherein the fluroxypyr-meptyl has a degree of crystallinity of at least about 80 percent, and wherein the coated particles are not prepared by an interfacial polycondensation microencapsulation process. It also concerns methods of preparation of said coated herbicide powder. It also concerns a high-load, herbicide granule which comprises: a) coated crystalline particles of fluroxypyr-meptyl coated with a mixture comprising: i) a water soluble nonionic surfactant; and ii) a water soluble anionic surfactant, and b) a particle agglomeration suppressant selected from the group consisting of an inorganic salt of an inorganic acid, an inorganic salt of an organic acid, and a nitrogen-containing compound such as a nitrogen fertilizer; wherein the granule comprises from about 350 grams active ingredient per kilogram (gai/kg) to about 700 gai/kg of fluroxypyr-meptyl, wherein the fluroxypyr-meptyl has a degree of crystallinity of at least about 80 percent, and wherein the coated crystalline particles are not prepared by an interfacial polycondensation microencapsulation process. It also concerns methods of preparation of said high-load, herbicide granule. It also concerns a high-load, herbicide granule when obtained by a process comprising: a) drying an oil-in-water emulsion comprising molten fluroxypyr-meptyl, a water soluble nonionic surfactant and a water soluble anionic surfactant to provide a coated herbicide powder comprising coated crystalline particles of fluroxypyr-meptyl coated with a mixture of the nonionic surfactant and the anionic surfactant, wherein the coated crystalline particles are not prepared by an interfacial polycondensation microencapsulation process, or dry-milling a solid mixture comprising fluroxypyr-meptyl, a water soluble anionic surfactant, a particle agglomeration suppressant, and, optionally, a water soluble nonionic surfactant to provide a dry-milled herbicide powder; b) adding a particle agglomeration suppressant to the coated herbicide powder prepared in step a); and c) granulating the dry-milled herbicide powder prepared in step a) or the powder prepared in step b), and water; wherein the water soluble nonionic surfactant, if not added to the dry milled herbicide powder in step a), is added to the dry-milled herbicide powder as a solution in water in step c); wherein the granule comprises from about 350 gai/kg to about 700 gai/kg of fluroxypyr-meptyl; wherein the fluroxypyr-meptyl in the granule has a degree of crystallinity of at least about 80 percent, and wherein the particle agglomeration suppressant is selected from the group consisting of an inorganic salt of an inorganic acid, an inorganic salt of an organic acid, and a nitrogen-containing compound such as a nitrogen fertilizer.