R3 and R4 are each hydrocarbyl groups containing from 1 to about 6 carbon atoms, X is an anion and n is an integer from 1 to about 3 (ii) adding the active to a continuous mixer, (iii) dispersing the active in water under controlled shear in the continuous mixer to form a homogeneous dispersion of the active, (iv) mixing the dispersion with 3 or more discrete portions of the ionizable salt added s