processo para preparar uma espuma rígida de poliuretano

摘要

The present invention discloses polyol formulations containing a polyester polyol having a functional of 2.5 to 4; an aromatic amine polyol and a polyether polyol having a functionality of 6 to 8. The polyol mixture are useful in making rigid polyurethane foams, especially foams for pour-in-place applications, where they give a good combination of low k-factor and short demold times.