POLYCARBONATE DIOLS - THE HIGH-GRADE ALTERNATIVE

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POLYCARBONATE DIOLS - THE HIGH-GRADE ALTERNATIVE
20 April 2005 - Bayer MaterialScience AG

The polyol component has a decisive influence on the properties of a polyurethane coating. Aliphatic polyester polyols are used in the formulation of flexible and lightfast coatings, whereas coatings based on polyacrylic polyols have particularly high hydrolytic stability.

Bayer MaterialScience AG now offers polyols that combine the advantages of these two established classes of raw materials. This combination makes Desmophen® C 2200, Desmophen® XP 2586, Desmophen® C 1200 and Desmophen® XP 2501 the ideal binders for weather-stable coatings that satisfy the most stringent requirements. Such coatings are resistant to chemicals, defy heat, exhibit long-lasting brilliance and have very good substrate adhesion.

Desmophen® C 2200 and Desmophen® XP 2586 are waxy, solid polycarbonate diols. They differ from one another only in their molecular weights of 2,000 g/mol and 1,000 g/mol, respectively. Bayer MaterialScience has accommodated the request of their customers to adjust the length of the polyol chain for the respective formulation.

Desmophen® C 1200 and Desmophen® XP 2501 are polyester carbonate diols that are liquid at room temperature. “These raw materials are therefore especially easy to apply, making them the perfect components for coatings used to coat roofs or balconies, for example,” says Dr. Steffen Hofacker, who is responsible for the development of polyurethane raw materials in the Coatings, Adhesives, Sealants Business Unit at Bayer Material Science. Similar to the polycarbonate diols, the polyester carbonate diols also offer the customer the choice between two chemically identical products with a molecular weight of either 2,000 g/mol (Desmophen® C 1200) or 1,000 g/mol (Desmophen® XP 2501).

Because all of the products are solvent-free and can be processed into aqueous dispersions, they can be used to meet the future requirements of more stringent VOC directives. These directives are intended to further reduce emissions of volatile organic compounds.

Because polycarbonate diols can be used to produce polyurethanes which, for example, retain their full tensile strength and flexibility even in hot, damp climates, these materials have a bright future. Hofacker is convinced that “not only coatings and textile coatings, but also casting elastomers, adhesives, sealants and thermoplastic polyurethanes can benefit from polycarbonate diols.” Bayer MaterialScience has expanded the production capacity at its Bitterfeld site accordingly.

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About: Bayer MaterialScience AG
Bayer Corporation, headquartered in Pittsburgh, is part of the worldwide Bayer Group, an international health care, nutrition and innovative materials group based in Leverkusen, Germany. Bayer employs 23,300 in North America with net North American sales of 8.8 billion euros in 2003. Bayer’s three operating business areas – HealthCare, CropScience and MaterialScience, improve people’s lives through a broad range of essential products that help diagnose and treat diseases, protect crops and advance automobile safety and durability.

Bayer MaterialScience AG is one of the world's largest producers of polymers and high-performance plastics. The main customers for Its innovative developments in coatings, adhesives, insulating materials and sealants, polycarbonates and polyurethanes are the automotive and construction industries, the electrical/electronics segment and manufacturers of sports and leisure goods, packaging, and medical devices.

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