Abstract: An aqueous composition includes a dihydrotriazine compound of the general formula below, where: R1 means (i) a phenyl group or phenylalkyl group, (ii) a naphthyl group or naphthylalkyl group, (iii) a heterocyclic group, heterocyclic alkyl group or heterocyclic aminoalkyl group, (iv) an alkyl group having 1 to 16 carbon atoms or (v) a cycloalkyl group or cycloalkylalkyl group, R1? means a hydrogen atom bonded to the nitrogen atom at position 1 or 3 of the dihydrotriazine ring, R2 and R3 each mean a hydrogen atom or a methyl group, R4 means an alkyl group having 7 to 16 carbon atoms, and the dashed line indicates that a double bond is positioned either between positions 1 and 2 or between positions 2 and 3 of the dihydrotriazine ring, or a tautomer thereof or a salt thereof and a surfactant.

Abstract: An aqueous composition includes a dihydrotriazine compound of the general formula below, where R1 means (i) a phenyl group or phenylalkyl group, (ii) a naphthyl group or naphthylalkyl group, (iii) a heterocyclic group, heterocyclic alkyl group or heterocyclic aminoalkyl group, (iv) an alkyl group having 1 to 16 carbon atoms or (v) a cycloalkyl group or cycloalkylalkyl group, R1? means a hydrogen atom bonded to the nitrogen atom at position 1 or 3 of the dihydrotriazine ring, R2 and R3 each mean a hydrogen atom or a methyl group, R4 means an alkyl group having 7 to 16 carbon atoms and the dashed line indicates that a double bond is positioned either between positions 1 and 2 or between positions 2 and 3 of the dihydrotriazine ring, or a tautomer thereof or a salt thereof and a defoamer.