Rheobyk 430 (formerly BYK 430)

Rheobyk 430 (formerly BYK 430) is a liquid rheology additive for solvent-borne and solvent-free medium-polarity systems to improve anti-sagging and anti-settling properties. The additive is particularly suitable for thick layer systems due to its pseudoplastic flow behaviour.

With the aid of the pigments and fillers, the additive generates a three-dimensional network structure. The entanglement of the high molecular weight polymers is responsible for the development of the pseudoplastic flow behaviour. The polarity of the system and the incorporation temperature influence the rheological effectiveness.

The settling of the pigments and fillers is prevented and outstanding anti-sagging properties are produced due to the rapid rebound in viscosity after shearing.

The additive has no "false body effect", no negative influence on the intercoat adhesion, and it is easy to process on account of its liquid form.