Patent ID: 7344730

Claim:
A process for the preparation of controlled release (CR) granules which contain micropores and are adapted for soil-application, and which are obtained by applying an active-ingredient-comprising coating to a solid carrier in a fluidized bed with a defined heat input of from about 11,864 to 25,000 kJ/kg of coating polymer, wherein the CR granules comprise, as coating polymer, a dispersion selected from the group consisting of: butyl acrylate/styrene copolymers, copolymer dispersions of acrylic and methacrylic esters, polyethylene wax emulsions, polyesters composed of the following units: 50 mol % dimethyl terephthalate+approximately 50 mol % adipic acid+150 mol % 1,4-butanediol and ethylene/methacrylic acid zinc salt, which process comprises applying to the carrier in a fluidized bed: first at least one active ingredient, and then the coating comprising at least one coating polymer and optionally additives, said micropores being generated in the coating by abrasion or by the use of water-soluble additives.