A dispersion is the main binder component of paints and varnishes that determines the key quality characteristics of the finished coating. It is an aqueous polymer dispersion obtained by copolymerization of polyacrylate and styrene. The proven composition based on a styrene-acrylic copolymer ensures stability and reliability in the manufacture of a wide range of architectural and construction coatings: interior paints, primers, wood coatings, etc.
Depending on the specific formulation into which the dispersion is introduced, the properties of the final product — hardness, flexibility, adhesion, water resistance — are adjusted by adding pigments, fillers and modifying additives. This allows the same base dispersion to be used for different paint and coating brands, adapting it to the technologist’s task.
A dispersion is a binder that is responsible for turning liquid paint into a solid coating. As the water evaporates, the polymer particles coalesce into a strong film that holds the pigments and fillers and ensures adhesion to the substrate. A high-quality dispersion determines the coating’s abrasion resistance, adhesion, gloss and durability. The hiding power and color of the final paint, however, depend on the type and amount of pigments and fillers introduced into the formulation.
The combination of an acrylic polymer and styrene yields a so-called styrene-acrylic dispersion. It is valued for its good adhesion, water resistance and affordable cost compared to pure acrylic alternatives. This makes it a popular binder for manufacturing a wide range of construction and renovation coatings, especially in the architectural paints and primers segment.
The same base styrene-acrylic dispersion can be used as a binder in formulations for interior paints, primers, wood and tile coatings. However, the final product properties — flexibility, hardness, UV resistance or specific adhesion to metal — are achieved by introducing modifying additives, coalescents and pigments. Therefore, for highly specialized applications (e.g., an elastic sealant with a very low glass transition temperature or a primer with an ultra-fine particle size), special grades of dispersions may be required. The technologist selects the specific formulation according to the required characteristics.