Mitsui Toatsu Chemicals, Incorporated

Kao Corporation

Seiichi Shimono

Tetsuji Iwasaki

Kazuhiko Kurita

Tamotsu Asano

Yutaka Kubota

Toshio Matsumoto

Takeshi Imakita

Yukio Kiritani

Tetsuo Yanami

Yoshinobu Shimura

Yuuji Enomoto

An aqueous suspension-type microcapsule insecticide composition which is obtained by emulsifying a hydrophobic admixture of liquid pyrethroid insecticide or a pyrethroid insecticide and a high boiling point solvent, preferably an alkyl ester of phthalic acid in which the alkyl group has 8-13 carbon atoms to form particles of a suitable size in the presence of an anionic water-soluble polymeric surface active agent and polycondensating melamine-formaldehyde or a derivative thereof on the surface of the said emulsified and dispersed particles, and a process for producing the composition. This composition exhibits stable insecticidal activity over a prolonged period with noticeably reduced toxicity to aquatic life.

Insecticide composition and production process thereof

Disclosed is an agricultural chemical composition in the form of an aqueous suspension, which comprises fine particles of a water-insoluble physiologically active substance having a melting point of 15.degree. to 70.degree. C., which are stably dispersed in water by a water-soluble or water-dispersible polymer comprising at least one monomer selected from the group consisting of unsaturated carboxylic acids and derivatives thereof as the indispensable component, as a dispersant, and a phthalic acid ester as an agent for preventing precipitation of crystals. In this agricultural chemical composition, the phthalic acid ester bleeds on the surface of the physiologically active substance to modify the surface, and the storage stability of the composition in the form of a suspension is highly improved.

Aqueous biocide composition stabilized by phthalic acid esters

Growing community of inventors

Yokohama, Japan

Seiichi Shimono