Triazine derivatives of the following formula (I): ** Formula ** in which: R1, R2, R3 and R4 are independently selected from the following groups: -H, -C1-C20 alkyl optionally substituted with halogen, (C1-C5) alkyl, (C1-C5) alkoxy or (C3-C8) cycloalkyl, (C2-C20) alkenyl optionally substituted with halogen, (C1-C5) alkyl or (C1-C5) alkoxy, -alkynyl ( C2-C20) optionally substituted with halogen, (C1-C5) alkyl or (C1-C5) alkoxy, -C3-C8 cycloalkyl optionally substituted with (C1-C5) alkyl or (C1-C5) alkoxy, -heterocycloalkyl ( C3-C8) with one or more heteroatoms chosen from N, O and S, and optionally substituted with (C1-C5) alkyl or (C1-C5) alkoxy, -C6-C14 alkyls (C1-C20) alkyl optionally substituted with amino, hydroxyl, thio, halogen, (C1-C5) alkyl, (C1-C5) alkoxy, (C1-C5) alkylthio, (C1-C5) alkylamino, (C6-C14) aryloxy, aryl (C6-C14) (C1-C5) alkoxy, cyano, trifluoromethyl, carboxy, carboxymethyl or carboxy ethyl, -C6-C14 -aryl optionally substituted with amino, hydroxyl, thio, halogen, (C1-C5) alkyl, (C1-C5) alkoxy, (C1-C5) alkylthio, (C1-C5) alkylamino, (C6-C14) aryloxy, aryl (C6-C14) (C1-C5) alkoxy, cyano, trifluoromethyl, carboxyl, carboxymethyl or carboxymethyl, -heteroaryl (C1-C13) with one or more heteroatoms chosen from N, O and S, and optionally substituted with amino, hydroxyl, thio, halogen, alkyl (C1-C5), alkoxy (C1-C5), alkylthio (C1-C5), alkylamino (C1-C5), aryloxy (C6-C14), aryl (C6-C14) alkoxy (C1-C5), cyano, trifluoromethyl , carboxy, carboxymethyl or carboxy ethyl, R1 and R2, on the one hand, and R3 and R4, on the other hand, possibly form with the nitrogen atom a ring of n members (n between 3 and 8) optionally containing one or more heteroatoms chosen from N, O and S, and possibly being substituted with one or more of the following groups: amino, hydroxyl, thio, halogen, (C1-C5) alkyl, (C1-C5) alkoxy, (C1-C5) alkylthio, (C1-C5) alkylamino, (C6-C14) aryloxy, (C6-C14) aryl (C1-C5) alkoxy, cyano, trifl uoromethyl, carboxy, carboxymethyl or carboxy e
