NOVELTY - Microcapsules enclosing Clomazone, is claimed, where the wall of the microcapsules is formed using an interfacial polymerization reaction of the wall forming materials comprising (a) aliphatic isocyanate, (b) aromatic isocyanate, and (c) substituted acetylene carbamide compounds (I), the microcapsules have a mean diameter of 0.3-25 mu m, and 90% of the microcapsules have a diameter lower than 100 mu m, when measured with a conventional laser diffraction particle size analyzer, previous customary dilution upon water under agitation.    USE - The microcapsules are useful for the preparation of an agrochemical formulation, which is in the form of a capsule suspension (claimed). No biological data given.    ADVANTAGE - The agrochemical formulation can be prepared with improved yield in an economical and environmentally friendly manner.    DETAILED DESCRIPTION - Microcapsules enclosing Clomazone, is claimed, where the wall of the microcapsules is formed using an interfacial polymerization reaction of the wall forming materials comprising (a) aliphatic isocyanate, (b) aromatic isocyanate, and (c) substituted acetylene carbamide compounds of formula (I), the microcapsules have a mean diameter of 0.3-25 mu m, and 90% of the microcapsules have a diameter lower than 100 mu m, when measured with a conventional laser diffraction particle size analyzer, previous customary dilution upon water under agitation.    R1, R3, R5, R7 = methylene, ethylene, n-propylene, isopropylene, n-butylene, isobutylene, sec-butylene, or tert-butylene;    R2, R4, R6, R8 = H (preferred), methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, or tert-butyl; and    R9, R10 = H (preferred) or hydroxymethyl.    INDEPENDENT CLAIMS are included for:    (1) a process of microencapsulation by interfacial polymerization reaction, where a water-immiscible phase is enclosed in microcapsules, water is the continuous phase, and the microcapsules wall is formed by the reaction of the components (a)-(c) as above per se, and the process comprises (A) preparing two phases comprising an oil phase by mixing, dissolving and/or dispersing the only active ingredient Clomazone, by mixing, dissolving and/or dispersing the components comprising polymer-forming materials (a)-(c) as above per se, an oil soluble or dispersible catalyst for the formation of a polyurea-substituted acetylene carbamide polymer, optionally a solvent, optionally an oil-soluble surfactant, and Clomazone as the only active ingredient, and a water phase by mixing, dissolving and/or dispersing water, a single emulsifier or a mixture of emulsifiers, a polymer of the type of polyvinylalcohol or polyvinylpyrrolidone or their derivatives, and a lignosulfonate or a mixture of lignosulfonates, (B) incorporating the oil phase to the water phase at 45-70 degrees C, with agitation, where the temperature depends on the reactivity and the catalyst choice in the oil phase, (C) forming the microcapsules wall at a temperature of 60-90 degrees C, (D) adding a catalyst that provokes the formation a microcapsule's wall of mixed polymer polyurea-substituted acetylene carbamide, and (E) stirring of the reaction solution formed, with a very low shearing stress being low enough to avoid the breaking of the microcapsules, for 1-4 hours; and    (2) a process for the preparation of an agrochemical formulation of the type capsule suspension comprising microcapsules, comprising (A1) providing a dispersion of a (i) water-immiscible phase comprising as the only active ingredient Clomazone and an aromatic isocyanate and an aliphatic isocyanate and (I) and solvent for dissolving any compound if it is a solid into an aqueous phase comprising a solution of water, a surfactant, a protective colloid, a polymer both having surfactant and protective colloid properties, at a temperature of 45-70 degrees C, and (B1) heating and maintaining the dispersion in a temperature of 20-90 degrees C, whereupon Clomazone is encapsulated within discrete polyurea-substituted acetylene carbamide mixed polymer enclosures.