Polyester polyol-containing polyurethane systems having improved hydrolytic stability
View Patent ↗An isocyanate reactive composition for making a polyurethane foam includes a tertiary amine urethane catalyst comprising a di(C1-C4)alkyl fatty alkyl amine and a polyester polyol. The use of one or more of fatty alkyl tertiary amine serves to reduce hydrolysis of the polyester polyol in the isocyanate reactive composition.
1. An isocyanate reactive composition for making spray rigid foam comprising at least one polyester polyol, at least one Mannich polyol, water and a urethane catalyst composition consisting of 10 to 40 wt % pentamethyldiethylenetriamine, 20 to 80 wt % tris(dimethylaminopropyl) amine and 10 to 50 wt % dimethylhexadecyl amine.
2. The composition of claim 1 further comprising a fire retardant.
3. The composition of claim 1 further comprising at least one member selected from the group consisting of cell stabilizers, crosslinking agents, chain extenders, pigments, and fillers.
4. The composition of claim 3 wherein the chain extenders comprise at least one of ethylene glycol and 1,4-butanediol.