Patent ID: 8367197

Claim:
A rigid polyurethane foam comprising: an ionic liquid; wherein the ionic liquid is represented by Formula 1: A + X − Formula 1 wherein the cation A + is a cation including N or P with oxidation number +1 and the anion X − is an anion including at least a halogen, S, N, P, C, or O with oxidation number −1; wherein the cation A + of the ionic liquid is at least one selected from the group consisting of: and R 30 R 31 R 32 R 33 P + , wherein R 1 to R 25 and R 30 to R 33 each are independently hydrogen, an alkyl or heteroalkyl having 1 to 20 carbon atoms, an alkenyl or heteroalkenyl having 1 to 20 carbon atoms, an alkoxyl or heteroalkoxyl having 1 to 20 carbon atoms, an aryl or heteroaryl having 4 to 20 carbon atoms, a fluoroalkyl having 1 to 20 carbon atoms, or cyano group; B is carbon, oxygen or nitrogen.