An increasing interest in rigid polyurethane foam for insulation materials is expected due to the world wide growing awareness of climate change and energy consumption. Related to this development, the fire safety in these building and construction applications, will also gain more attention. In order to meet these requirements various flame retardants are used in rigid polyurethane foams. One of the most widely used group of flame retardants is based on phosphorus. This includes chlorinated phosphate esters and halogen free compounds. In the presentation, novel phosphorus based flame retardants developed by LANXESS will be introduced. The performance of these products in rigid polyurethane foam formulations will be shown in comparison to other established flame reterdante. Within the scope of the comparison, the effectiveness of the novel retardants in fire tests will be shown. Furthermore, the impact of the products on processing, stability, and foam properties will be discussed. The results indicate that the novel flame retardants can help to match the requirements for rigid polyurethane foams.
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