BYK 156

BYK-156 is a dispersing additive primarily used for stabilizing pigments in aqueous emulsion paints in the North American market. It's composed of an ammonium salt of an acrylate copolymer dissolved in water. The typical properties include a density of 9.82 lbs/US gal at 68°F and a non-volatile matter content of 51% at 266°F.

Its special features include stabilizing pigments and fillers through electrostatic repulsion, increasing gloss, reducing viscosity, and enhancing storage stability. However, it does not have a foam stabilizing effect. Being an ammonium salt, it affects curing and water resistance to a lesser extent than metal salts.

Recommended applications for BYK-156 include architectural coatings, protective coatings, and industrial coatings. The recommended levels of addition vary based on the type of pigment being used. It's suggested to incorporate the additive into the mill base before adding pigments for optimal performance.

For regions outside North America, BYK-154 is recommended, which is similar to BYK-156 but differs in non-volatile content.