The composition of isocyanate and its use in the preparation of expanded polyurethane with improved physical properties mecu00e3nicas

摘要

"The composition of isocyanate and its use in the preparation of expanded polyurethane with improved physical mechanical properties.The present invention relates to compositions of isocyanate with isocyanate functionality between 2 and 2.9 that include (a) 20 to 80% by weight of the product of the reaction of methylene diphenyl diisocyanate (MDI) with at least a polyether polyol comprising ethylene oxide (EO) and propylene oxide (PO) with a functionIonalidade from 2 to 8.An average molecular weight of 200 to 6000 and a content of ethylene oxide, 20 to 90% by weight, and with each reaction product has a free NCO content of 26 to 33% by weight; and (b) 10 to 80% by weight of a PO.Lu00edmero of MDI.