The use of PPC polyols in polyisocyanurate foams has been demonstrated, with the preparation of typical density foams readily achievable at commercial scale. Polyisocyanurate foams produced using PPC polyols had outstanding fire performance properties while maintaining mechanical properties of the foam (Figure 10). These foams have a similar look and feel to foams based on the incumbent polyester polyols with the exception that the PPC containing foams have a smaller average cell size. The high viscosity of the PPC polyol was overcome by blending with materials typically found in a rigid foam formulation, such as polyester polyols or high recycle content polyols. The PPC polyols, which have an inherent lower heat of combustion, can generate foam that can achieve the same fire properties with a significant reduction in flame retardant. Increasing levels of PPC show further benefit in fire performance.
展开▼
