POLYOL COMPOSITIONS FOR PRODUCING RIGID POLYURETHANE FOAMS

摘要

A polyol composition for producing rigid polyurethane foams is disclosed which contain adducts of ethylene oxide or propylene oxide or both to resorcinol, catechol, cresorcinol or their homologues having two hydroxyls at the ortho or meta positions to each other, or adducts of ethylene oxide or propylene oxide or both to bisphenol A in combination with a second polyol and a low molecular weight glycol as a crosslinking agent. The resultant rigid polyurethane foams have such a high heat resistance as to stand the use over a long period under high temperature circumstances.