Isocyanate-based rigid foam and process for making isocyanate-based rigid foam also stable polyester polyol compositions.

摘要

A process for producing a rigid isocyanate-based foam comprises the steps of reacting an organic and/or modified organic polyisocyanate with a polyol composition and, optionally, with a relatively low molecular weight chain extender or crosslinker in the presence of a catalyst. Auxiliaries and/or additives may also be included in the reaction mixture. The polyol composition comprises a phthalic anhydride-initiated polyester polyol, a blowing agent comprising a C 4 -C 6 hydrocarbon, and a fatty acid or fatty alcohol ethoxylate compatibilizing agent. The blowing agent is soluble in the polyol composition, thereby reducing the risks associated with the use of such blowing agents in the manufacture of rigid polymer foam articles and enabling the production of rigid foam having good dimensional stability and improved insulation properties. The stable polyester polyol composition and the isocyanate-based rigid foam are also claimed as such.