a process for producing a flexible or rigid polyurethane foam is provided in which a polyol and a polyisocyante are reacted in the presence of an amine catalyst , a blowing agent , and a foam stabilizer , the amine catalyst comprising at least one amine compound represented by general formula below : ## str1 ## where r 1 , r 2 , r 3 , and r 4 are respectively an alkyl group of 1 to 6 carbons independently ; n is an integer of 0 or 1 ; and a is an alkyl group of 11 to 14 carbons when n is 0 , or an alkylene group of 10 to 15 carbons when n is 1 . the amine catalyst has low odor and low volatility , and gives high curing rate , and excellent moldability with a formulation of reduced fluorocarbon and increased water as the blowing agent .