An aqueous dispersion of resin particles comprising a dispersing group covalently bonded to the resin and at least one repeating unit of formula I, II and/or III and which is obtainable by contacting a compound A comprising at least 2 functional groups selected from the group of functional groups XC(O)CHR1-C(O)R2, XC(O)CCR2; or XC(O)CR1CR2-NR11R12, with a compound B comprising at least two NH.sub.2, NH.sub.3.sup.+ or NCO, wherein X, R1, R2, R3, R11 and R12 have the same meaning as that defined in the claims and wherein compound A and/or B comprise a dispersing group. The invention also includes a method of producing the aqueous dispersion and further relates to an aqueous inkjet ink comprising the resin particles. ##STR00001##