Process for preparing a biodegradable polyurea/polyurethane microcapsule, which comprises the following steps in this order: (a) carrying out a first polymerization and/or crosslinking step, which comprises: providing an internal non-aqueous phase, comprising at least one polyisocyanate having two or more isocyanate groups and at least one lipophilic active ingredient to be encapsulated; providing an external aqueous phase, comprising at least one protective colloid and optionally an emulsifier, and adjusting the pH of the aqueous phase to a pH of 1 to 5; mixing the internal non-aqueous phase and the external aqueous phase to obtain an oil-in-water emulsion or dispersion; adding at least one first amino acid or an amino acid hydrochloride and a catalyst and adjusting the pH of the emulsion or dispersion to a pH of 4 to 8; (b) carrying out a second polymerization and/or crosslinking step by adding at least one hydroxyl group donor; (c) carrying out a third polymerization and/or crosslinking step by adding at least one second amino acid and adjusting the pH of the emulsion or dispersion to a pH of 4 to 8, in particular at a temperature of at least 60°C, to obtain a microcapsule dispersion; (d) optionally adding a further catalyst and adjusting the pH of the emulsion or dispersion to a pH of 4 to 7; (e) curing the microcapsule dispersion obtained from step (c) or (d) at a temperature of at least 60°C for a duration of at least 60 minutes; (f) adding at least one release agent and incorporating the release agent into the microcapsule shell; (g) post-curing the microcapsule obtained in step (f); and: (h) optionally separating the microcapsules from the microcapsule dispersion and, if necessary, drying the microcapsules or adjusting the viscosity of the microcapsule slurry by adding a thickening agent. (a) carrying out a first polymerization and/or crosslinking step, which comprises: providing an internal non-aqueous phase, comprising at least one polyisocyanate having two or more isocyanate groups and at least one lipophilic active ingredient to be encapsulated; providing an external aqueous phase, comprising at least one protective colloid and optionally an emulsifier, and adjusting the pH of the aqueous phase to a pH of 1 to 5; mixing the internal non-aqueous phase and the external aqueous phase to obtain an oil-in-water emulsion or dispersion; adding at least one first amino acid or an amino acid hydrochloride and a catalyst and adjusting the pH of the emulsion or dispersion to a pH of 4 to 8; providing an internal non-aqueous phase, comprising at least one polyisocyanate having two or more isocyanate groups and at least one lipophilic active ingredient to be encapsulated; providing an external aqueous phase, comprising at least one protective colloid and optionally an emulsifier, and adjusting the pH of the aqueous phase to a pH of 1 to 5; mixing the internal non-aqueous phase and the external aqueous phase to obtain an oil-in-water emulsion or dispersion; adding at least one first amino acid or an amino acid hydrochloride and a catalyst and adjusting the pH of the emulsion or dispersion to a pH of 4 to 8; (b) carrying out a second polymerization and/or crosslinking step by adding at least one hydroxyl group donor; (c) carrying out a third polymerization and/or crosslinking step by adding at least one second amino acid and adjusting the pH of the emulsion or dispersion to a pH of 4 to 8, in particular at a temperature of at least 60°C, to obtain a microcapsule dispersion; (d) optionally adding a further catalyst and adjusting the pH of the emulsion or dispersion to a pH of 4 to 7; (e) curing the microcapsule dispersion obtained from step (c) or (d) at a temperature of at least 60°C for a duration of at least 60 minutes; (f) adding at least one release agent and incorporating the release agent into the microcapsule shell; (g) post-curing the microcapsule obtained in step (f); and: (h) optionally separating the microcapsules from the microcapsule dispersion and, if necessary, drying the microcapsules or adjusting the viscosity of the microcapsule slurry by adding a thickening agent.