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Aqueous coating compositions comprise a polymer of defined molecular weight which contains either anionisalbe or cationisable groups and also certain defined non-ionisable water-soluble moieties( derived for example from poly-ethylene glycol) water , optionally an organic coupling solvent and optionally either base or acid, the presence in the polymer of regularly distributed ionisable groups and non-ionisable water-soluble moieties enables the selection of aqueous polymer solutions for use in coating compositions which, on dilution, show a regular relationship between viscosity and solids content the polymer solutions are particularly useful in the formulation of paints.