Modified crude toluene diisocyanate to obtain polyurethane with an improvement in high resiliency

摘要

Modified crude toluene diisocyanate characterized by the fact that it is obtained by reaction first of a crude toluene diisocyanate with a polyol in such a quantity that the lowering of the isocyanate concentration of the crude toluene diisocyanate at the most amounts to about 2.0-NCO groups per kilogram of crude toluene diisocyanate and by the fact that in a second step the above reaction product is aged under heat application for such a temperature and period of time that the lowering of the isocyanate concentration of this reaction product at the most amounts to 0.4-NCO groups per kilogram of product. This modified crude toluene diisocyanate can be used for making high resiliency polyurethane foam with improved properties.