Feb 19 2007
The Coatings, Adhesives, Sealants (CAS) Business Unit of Bayer MaterialScience AG has extended its range of solvent-free products with the addition of two Bayhydrol® polyurethane dispersions specially developed for the coating of plastics. The new additions are Bayhydrol® XP 2606 and the more flexible variant Bayhydrol® XP 2648. These two products can be used to formulate flexible coatings having a good property level when used as a filler, basecoat or topcoat. The very rapid drying of both products enables fast processes in industrial applications.
Bayhydrol® XP 2606 exhibits good cold flex resistance and is particularly well suited for the coating of PVC substrates. Bayhydrol® XP 2648 is even more flexible and offers good adhesion to other difficult substrates such as polyamide. With the addition of crosslinking components such as low-viscosity Desmodur® grades, good adhesion to even polystyrene surfaces can be achieved. Hydrophilized Bayhydur® grades, which can be easily incorporated into waterborne systems, are suitable combination partners for the formulation of high-gloss, two-component polyurethane coatings. The chemical structure of these Bayhydrol® grades significantly extends the typical pot life of two-component systems, resulting in a wider than normal processing window for these systems.
Because of their unlimited intermiscibility, the two products can be freely blended to cover a pendulum hardness range of 40 - 140 seconds (according to König). Both products can be blended with polyacrylates to further expand the application window.