Patent ID: 8513318

Claim:
A method for producing a rigid polyurethane foam, which comprises reacting a polyol with a polyisocyanate in the presence of an amine catalyst and blowing agent, wherein as the amine catalyst, at least one amine compound selected from the group consisting of trimethylhexamethylenediamine, tetramethyldiethylenetriamine, bis(N,N-dimethylaminopropyl)amine, N,N-dimethylaminoethyl-N′-methylaminoethanol, N,N,N′-trimethyl-N′-hydroxyethylbisaminoethyl ether, N,N-dimethylaminoethyl-N′-methylaminoethyl-N″-methylaminoisopropanol, and N-(3-dimethylaminopropyl)-N,N-diisopropanolamine is used and the blowing agent is 1,1,1,3,3-pentafluoropropane (HFC-245fa).