Improvements in or relating to the manufacture of pest control compositions

Abstract

Abstract Insecticidal preparations are obtained by mixing by mechanical means a compound of the general formula R1(R2) CH-CX3, R1 being an organic radical containing at least three carbon atoms, R2 being an organic radical containing at least 5 carbon atoms and X being chlorine or bromine, with sufficient of an aqueous solution or suspension of a solid water-miscible dispersing agent for the said compound to form a paste. Suitable compounds are p-p1-dimethyl- or p-p1-dichloro-diphenyltrichlorethane. Suitable dispersing agents include soap, goulac, saponine, lime casein, and sulphonated oils, long-chain fatty acids, petroleum products or long-chain aliphatic alcohols. The admixture may be effected at a temperature either above or below the melting point of the active compound. The two components of the mixture may be ground together in an edge runner mill until a smooth paste is obtained which may then be dried, reground to a fine powder and sieved. The resulting powder can be dispersed in water. A proportion of volatile solvent, e.g., methanol, may be added during the grinding operation, this solvent being removed in the subsequent drying operation. Specifications 547,874, 566,387 and 573,832 are referred to.

Inventors

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