Method of producing copper hydroxosulphates and copper fungicidal compositions containing same
AssigneeCerexagri, Inc.
InventorsFrederic Ferrier, Gerard Joncheray, Marc Pillot
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Abstract
The subject of the invention is a process for the manufacture of aqueous suspensions of copper hydroxosulphates such as brochantite or antlerite, or a mixture of both, having a high copper content by weight, by reacting an aqueous solution of copper sulphate with an aqueous suspension of copper oxide or copper hydroxide in which the mean diameter of the solid particles is less than 25 μm. The invention also relates to the preparation of cupric fungicidal compositions having a copper content which may be as high as 45%, in the form of powders, granules or suspension concentrates, dispersible in water, and their use for the fungicidal treatment of crops.
Claims26
A hydroxosulfate mixture of both brochantite (Cu4(OH)6SO4) and antlerite (Cu3(OH)4SO4), wherein the copper content of the mixture attributable to brochantite and antlerite is between 30% and 45% by weight of the mixture, wherein the mixture is made by a process which comprises reacting an aqueous solution of copper sulphate (CuSO4) with an aqueous suspension of solid particles of copper oxide in a total SO4/Cu molar ratio ranging from 0.25 to 0.40, the aqueous solution of CuSO4 having a concentration by weight of copper of between 6% and 10% and the aqueous suspension of solid particles of copper oxide having a concentration of copper oxide between 15% and 50% by weight wherein the mean diameter of the solid particles of copper oxide in the suspension is less than 25 μm, and wherein the reaction is carried out at a controlled temperature between 40° C. and 100° C.
Dependencies are inferred from the claim text.