Kumiai Chemical Industry Co., Ltd.

Nippon Soda Co., Ltd.

Kazunori Kurita

Shigeki Fujita

Tetsuo Ohkawa

Yuji Misumi

Eisuke Ozaki

A process for efficiently producing a water-dispersible particulate agricultural-chemical composition having improved disintegrability/dispersibility in water, the composition having a particular size in the range of 50-1,000 &#x3bc;m. The process is characterized by comprising the following steps (a) to (e): (a) a step of kneading an agricultural-chemical active ingredient, a surfactant, and water; (b) a step of extruding the resultant mixture through a screen having pores 600-2,000 &#x3bc;m in diameter to form granules; (c) a step of drying the granules; (d) a step of rotating two toothed rolls with irregularities on the surface arranged in parallel to each other, and leading the dried granules to pass between the toothed rolls thereby pulverizing the granules; and (e) a step of sieving the pulverized granules.

Process for producing water-dispersible particulate agricultural-chemical composition

Provided is a granular agrochemical composition by which the problems accompanying the prior art granular agrochemical compositions can be overcome, which can be prepared in a simple formulation and by which sustained releasability of the agrochemically active ingredient is obtained so that the load on the environments can be decreased and the chemical damages caused by the agrochemically active ingredient can be alleviated or prevented. The granular agrochemical composition contains an acidic agrochemically active ingredient, a cationic surfactant and a basic substance. Inter alia, a pH of 5 or higher is obtained in a 1% by mass aqueous suspension thereof. Preferably, the acidic agrochemically active ingredient should have a pKa of 2 to 7 and the cationic surfactant should be one which is gelled or exhibits swellability in water.

Growing community of inventors

Tokyo, Japan

Kazunori Kurita