![]() ![]() Taken together, both new solutions from Covestro offer easy, safe and sustainable processing. This means that PU molders have more room for variation and customization of their elastomer components. The ability to adjust pot life and tune production processes gives polyurethane processors more options for creating a high-precision production environment and potentially boosting their production efficiency.Īnother major benefit is the increased versatility of the Desmodur® prepolymers, which enable a far wider range of hardnesses than conventional prepolymers used in MOCA-based systems. One major benefit is the inherent compatibility of the Desmodur®-based systems with additives such as catalysts for a targeted acceleration of reactions. In fact, molders who make the switch only stand to gain from the new prepolymer systems. Molders can easily switch from TDI-MOCA to one of the two Desmodur® systems while maintaining their current performance and processing parameters. Each of these prepolymers can be combined in a specific ratio with a crosslinker to produce an elastomer with specific properties, especially in terms of hardness. The new solution consists of a flexible toolbox of Desmodur® MTX6076 and Desmodur® MT99xx. Furthermore, the continuous development to make safe handling of products even easier is one of the cornerstones of our corporate social responsibility policy.” The new solution is not only less hazardous to employee health and bound to fewer production restrictions, but also an extremely flexible solution that outperforms current alternatives on the market.ĭesmodur® MOCA-free solution from CovestroĬovestro’s MDI-based alternative relies on its proven Desmodur® prepolymers which are backed by nearly eight decades of experience across a wide range of industries. We focus on expanding our portfolio to include a greater number of sustainable systems. Moreover, MDI-based prepolymers have a low vapor tension, making them easier to handle with fewer restrictions compared to TDI-based systems.Īs Thomas Braig, President and CEO of Covestro Elastomers, explains: “Sustainability drives innovation at Covestro. Conventional curatives for MDI are generally less toxic, and therefore less demanding with regards to health and safety precautions. More than just a functional equivalent, Covestro’s push for MDI systems aligns with its core values. So instead of simply searching for a new curative, Covestro’s chemists decided to develop an entirely new system based on methylenediphenyl diisocyanate (MDI) instead of TDI prepolymers. Processing is more difficult, as is achieving consistent quality. But simply replacing MOCA with a different curative for TDI prepolymers does not yield the same results. For decades, MOCA was used as a crosslinker for toluene diisocyanate (TDI) prepolymers. To achieve the best results, these two elements need to be compatible. Polyurethane elastomers are created by reacting a prepolymer and a crosslinker. The road to a sustainable MOCA-free alternative
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