AbstractThe objective of the investigations was to compare flocculating properties of three different water soluble resins: poly(ethylene oxide), PEO, with molecular mass Mv= 3.94 · 106g/mol; polyacrylamide, PAAm, Mv= 2.1 · 106g/mol, and tetramethyl‐2,6‐ionene bromide, ionene, Mw= 1500 g/mol. In each case the Healy‐La Mer theory proved to be valid due to the appearence of maximum points on both the subsidence w vs. polymer concentration c, and acceleration aQvs. c curves. The ratios of these maximum values determined on aluminium silicate suspensions are as follows:\documentclass{article}\pagestyle{empty}\begin{document}$$\begin{array}{l} {\rm w}_{\rm max} ({\rm PEO}):{\rm w}_{\rm max} ({\rm PAAm):w}_{\rm max} ({\rm ionene}) = 5128:333:1 \\ {\rm a}_{\rm Q, max} ({\rm PEO):a}_{\rm Q, max} ({\rm PAAm):a}_{\rm Q, max}({\rm ionene}) = 1.84:2.68:1.\\ \end{array}$$ \end{document}Contrary to aluminium silicate suspension dispersed TiO2particles are not flocculated by PEO, although zeta potentials in both cases were found to be close up to each other, i.e. −16.68 and −16.38 mV, respectively. Nonetheless, the investigations carried out revealed the possibility to convert the high molecular weight PEO from being a stabilizer of the TiO2suspension into a flocculant by means of interpolymer complexation with the ionene, i.e. a polyammonium salt. The ratios of maximum values related to complexes prepared with different unit mole ratios (u.m.r., values indicated in parantheses) are as follows:\documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm w}_{\rm max} (0):{\rm w}_{\rm max} (0.5):{\rm w}_{\rm max} (1.0):{\rm w}_{\rm max} (2.0):{\rm w}_{\rm max} (\infty ) = 0:1.2:1.7:1.25:1 $$\end{document}and\documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm a}_{\rm Q, max} (0):{\rm a}_{\rm Q, max} (0.5):{\rm a}_{\rm Q, max}(1.0):{\rm a}_{\rm Q, max} (2.0):{\rm a}_{\rm Q, max} (\infty) = 0:0.70:0.60:0.60:1. $$\end{document}Values at u.m.r. = 0 refer to uncomplexed PEO and at u.m.r. = ∞ to the uncomplexed ionene,