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Self-crosslinking resin binder for 1K stoving systems : Desmotherm® COVESTRO Peinture, Encres, Adhésifs et spécialités

Self-crosslinking resin binder for 1K stoving systems : Desmotherm®

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Desmotherm® is an aromatic, self-crosslinking urethane resin used primarily as a binder in one-component (1K) stoving polyurethane systems. Desmotherm® resin is ideal for highly flexible primers, intermediate coats, primer surfacers and thin coil-coating primers.

As an aromatic, self-crosslinking stoving urethane resin, Desmotherm® from Covestro contains both the polyol and blocking agent or hardener necessary for crosslinking. These material characteristics are key influencers in the quality and performance of a finished coating.

Desmotherm®-based systems are used as primer surfacers in automotive OEM finishing. The properties of films based on Desmotherm® are largely independent of the stoving conditions.

The film properties are customized by combining various polyesters from the Desmotherm® urethane resin grades, amino resins and flexibilizers. When formulating coatings with Desmotherm®, temperatures should not exceed 60° C or a crosslinking reaction will start. Optimum film properties are obtained after approximately 30 minutes at 130° C. Overbaking at approximately 180° C is possible without any significant deterioration in film quality.

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