BYK-425

VOC-free, liquid rheology additive for aqueous dispersion-based systems to improve anti-sagging and to adjust in-can viscosity. The additive is suitable for increasing the grinding viscosity of aqueous pigment pastes. The rheological effectiveness of BYK-425 is primarily based on the associative interaction with the dispersion particles of the aqueous binder and enables a highly pronounced pseudoplastic flow behavior. The urea modification of the additive also causes an increase in the rheological effect via hydrogen bonds. BYK-425 is VOC- and APEO-free, does not impair gloss, and its rheological effect is not dependent on the pH value. BYK-425 is suitable for all kinds of aqueous coatings, printing inks, and adhesives in order to improve the anti-sagging properties and set the required in-can viscosity of the formulation. The resulting increase in viscosity simultaneously improves the storage stability with reduced settling. When grinding pigment pastes, the additive can also increase the millbase viscosity and therefore improve the dispersion conditions. For formulations with a considerably lower application viscosity (e.g. coatings for conventional spraying), it is recommended to use BYK-425 together with BYK-420 (or BYK-D 420 or BYK-7420 ES), as the anti-settling properties are much more pronounced.