Patent ID: 9353234
Filing Date: 2016-05-31
CPC Classification: C08G,C08J

Claim Text:
1. A rigid polyurethane foam obtained by reaction of a reactant mixture comprising: A) an organic or modified organic polyisocyanate; B) a polyetherester polyol having two or more isocyanate-reactive hydrogen atoms; C) optionally, a polyester polyol; and D) optionally, a polyetherol polyol; in the presence of E) optionally, a flame retardant, F) a blowing agent, and G) a catalyst, wherein the polyetherester polyol B) is a reaction product of components, comprising: a1) 15 to 40 wt % of water or a polyol or a polyamine, the polyol or polyamine having an average functionality of 2.5 to 8, a2) 2 to 30 wt % of a fatty acid or fatty acid monoester, and a3) 50 to 70 wt % of an alkylene oxide having 2 to 4 carbon atoms, wherein the polyetherester polyol B) is obtained by initially preparing a mixture comprising a1) the water, the polyol or the polyamine and a2) the fatty acid or the fatty acid monoester in a reactor, inertizing the reactor and adding a3) the alkylene oxide to the inertized reactor.