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News

More efficient coating of plastics, Good adhesion even to difficult surfaces

Bayer MaterialScience AG : 03 September, 2007  (Company News)
The Coatings, Adhesives, Sealants 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.
The Coatings, Adhesives, Sealants 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.
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