The present invention relates to diaminotriazine compounds of the formula (I) and to their use as herbicides. The present invention also relates to agrochemical compositions for crop protection and to a method for controlling unwanted vegetation. wherein q is 0, 1, 2 or 3 Ra is selected from the group consisting of C1-C6-haloalkoxy, C1-C6-haloalkylthio, (C1-C6-haloalkyl)sulfinyl, (C1-C6-haloalkyl)-carbonyl, etc.; Rb is selected from the group consisting of halogen, OH, CN, amino, NO2, C1-C6-alkyl, C2-C6-alkenyl, C2-C6-alkynyl, C1-C6-alkoxy, etc.; R1 is selected from the group consisting of H, OH, S(O)2NH2, CN, C1-C6-alkyl, C2-C6-alkenyl, C2-C6-alkynyl, (C3-C6-cycloalkyl)-C1-C4-alkyl, etc.; R2 is selected from the group consisting of H, OH, S(O)2NH2, CN, C1-C6-alkyl, C2-C6-alkenyl, C2-C6-alkynyl, (C3-C6-cycloalkyl)-C1-C4-alkyl, etc.; R3 is selected from the group consisting of H, halogen, OH, CN, C1-C6-alkyl, (C1-C6-alkoxy)-C1-C6-alkyl, C3-C6-cycloalkyl, etc.; R4 is H, halogen, CN, C1-C6-alkyl, C1-C6-haloalkyl, C3-C6-cycloalkyl, C3-C6-halocycloalkyl, C1-C6-alkoxy and C1-C6-haloalkoxy; R5 is selected from the group consisting of halogen, CN, C1-C6-alkyl, C2-C6-alkenyl, C3-C6-alkynyl, C3-C6-cycloalkyl, etc.; or R4 and R5 together with the carbon atom to which they are attached form a moiety selected from the group consisting of carbonyl, C3-C6-cycloalkan-1,1-diyl, ipso-C3-C6-cycloalkendiyl, three- to six-membered saturated or partially unsaturated ipso-heterocyclodiyl; including their agriculturally acceptable salts.