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Polycarbonate diols - the high-grade alternative

Bayer MaterialScience AG : 20 April, 2005  (Company News)
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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