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Coalescent is a functional additive in water-dispersion paints and varnishes that promotes film formation. Coalescents are designed to reduce the minimum film-forming temperature, to facilitate the coalescence process: sticking together or fusion of film-forming drops. In the process of film formation, the coalescents must completely leave the paint film after the drying process, the remains of the coalescent negatively affect the performance properties of the paint coatings. The optimal selection of the nature and amount of coalescents largely determines the quality of the formation of the paintwork.