Wetting agents and dispersants having rheological character

A process for preparing a polyaddition compound and/or a salt thereof, the process comprising:

• reacting an epoxy resin based on at least one diglycidyl ether of Formula (I)
• wherein R=a divalent aliphatic or monocyclic aromatic or bicyclic aromatic radical or mixtures thereof
• with at least one polyether alcohol of Formula (II)
• R1-[OEt]n-[OPr]m-[OBu]s-[OSO]r-OH Formula (II)
• wherein
• R1=independently identical or different, linear or branched, optionally aromatic hydrocarbyl radicals having 1 to 18 carbon atoms,
• [OEt]=ethylene oxide radical,
• [OPr]=propylene oxide radical,
• [OBu]=butylene oxide radical,
• [OSO]=styrene oxide radical, n=0 to 100, m=0 to 50, s=0 to 20, and r=0 to 3,
• with the proviso that n+m+s+r=3-103, at a temperature between 25° C. and 300° C.,
• then reacting with at least one compound containing at least one functional group selected from the group consisting of sulfate groups, sulfonate groups, carboxylate groups and phosphate groups.