Modified dimethyloldihydroxyethylene urea. Crosslinker for low formaldehyde, chlorine-resistant, washfast resin finishing of woven and knitted fabrics composed of cellulosic fibres and their blends with synthetic fibres. Good reactivity and good stability to hydrolysis. Particularly low formaldehyde values according to the LAW 112 and AATCC methods. Low impact on tear strength and low sensitivity against varying curing conditions.