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News

Low viscosity and fast drying

Bayer MaterialScience AG : 21 April, 2005  (Company News)
In conventional polyurethane coatings with a medium solids content, use is often made of a favorable combination of hardeners derived from two different diisocyanates: a hexamethylene diisocyanate (HDI) hardener ensures above all the good crosslinking and resistance properties of the resultant coatings, while an isophorone diisocyanate (IPDI) hardener accelerates physical drying.
Bayer MaterialScience AG has now developed an IPDI-based hardener designated Desmodur® XP 2565 which greatly reduces the solvent content of polyurethane coatings. High-solids coatings can now be formulated with particularly fast drying properties. “This makes the hardener perfect for vehicle repair coatings, but other polyurethane coating systems that are used for applications like industrial goods can also benefit,” says Dr. Raul Pires, who is in charge of transportation and vehicle repair coatings at Bayer MaterialScience.

In Desmodur® XP 2565, Bayer MaterialScience has found another answer to the mounting demand for raw materials for low-solvent, high-solids polyurethane coatings. The market is reacting to the stricter regulations that aim to reduce emissions of volatile organic compounds (VOC). Waterborne polyurethane systems are also becoming increasingly popular because of their environmental friendliness, and this new hardener is ideal for them, too.

Due to its low viscosity, the hardener can be mixed with the aqueous phase, but because it is not hydrophilically modified, it can be used to formulate aqueous coatings that are particularly weather-stable and chemically resistant. “With Desmodur® XP 2565, paint companies have the first IPDI-based hardener for fast-drying, waterborne polyurethane coatings,” says Dr. Martin Melchiors, an expert in polyurethane coating raw materials at Bayer MaterialScience.

Desmodur® XP 2565 is an allophanate and more stable than many other low-viscosity polyisocyanates. It complies with the requirements of the European Inventory of Existing Chemical Substances (EINECS) and the Toxic Substances Control Act (TSCA) and can thus be marketed all over the world.
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