Suitable for use in high-quality, wash- and scrub-resistant indoor emulsion paints and for silicate emulsion paints. Characterized by low spattering when applied by brush or roller, high water retention capacity, allows lap-free application by brush or roller, no pigment flocculation, optimum use of color pigments, uniform and high-covering films, good storage stability, allows sparing use of preservatives, good thickener effect, allows particularly economical metering. Can be supplemented by combination with suitable synthetic thickeners. Have been chemically treated to delay their solubility. Makes it easy to incorporate into the coating formulation.