New solvent-free, one-component polyurethane dispersions: More efficient coating of plastics

Good adhesion even to “difficult” surfaces

Friday - February 16, 2007 - Leverkusen – 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.

Additional information about polyurethane coatings can be found at www.bayercoatings.com.

With 2005 sales of 10.7 billion euros, Bayer MaterialScience AG is among the world’s largest polymer companies. Business activities are focused on the manufacture of high-tech polymer materials and the development of innovative solutions for products used in many areas of daily life. The main segments served are the automotive, electrical and electronics, construction and the sports and leisure industries. Bayer MaterialScience employs approximately 18,800 people (2005) at 40 production sites around the globe. Bayer MaterialScience is a Bayer Group company.

News and information about products, applications and services available from Bayer MaterialScience AG is available at www.bayerbms.com. Data and facts about the company itself can be found at www.facts.bayerbms.com.

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Dr. Frank Rothbarth

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Bayer MaterialScience AG

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