Abstract: An amine catalyst for producing polyurethane comprising a compound of formula (I): ##STR1## wherein n is an integer from 0 to 3, and R.sub.1, R.sub.2, and R.sub.3 are each independently a C.sub.1-3 alkyl group. The amine catalyst has a secondary hydroxyl group in the molecule and is non-bleeding in the polyurethane resin and excellent in moldability. A process for producing a polyurethane foam by reacting a polyol with a polyisocyanate in the presence of the amine catalyst defined above and a foaming agent are also disclosed.

Abstract: A process for producing a rigid polyurethane foam by use of a decreased amount of a CFC blowing agent and an increased amount of water used as a blowing agent, maintaining a high degree of heat insulation and improving the deterioration in friability of the product. The catalyst is one of the imidazoles represented by the formula (I): ##STR1## where R.sup.1 is alkyl having 1 to 4 carbons, benzyl, dimethylaminopropyl, or hydroxyalkyl having 1 to 3 carbons; R.sup.2 is hydrogen, alkyl having 1 to 4 carbons, allyl, or benzyl; and R.sup.3 and R.sup.4 are independently hydrogen, methyl, or hydroxymethyl.

Abstract: A fine-cell rigid polyurethane foam is prepared by reacting a polyol having a blowing agent such as water incorporated therein with a polyisocyanate in the presence of an amine catalyst having a retarding effect. The amine catalyst is comprised of (a) 30 to 50 parts by weight of triethylene diamine, (b) 30 to 50 parts by weight of bis(dimethylaminoethyl)ether and/or N,N',N",N"-pentamethyldiethylene triamine, (c) up to 40 parts by weight of tetramethylhexamethylene diamine and/or trimethylaminoethylpiperazine, and (d) formic acid in an amount of 0.2 to 1.5 moles per mole of triethylene diamine.

Abstract: A fine-cell rigid polyurethane foam is prepared by reacting a polyol having a blowing agent such as water incorporated therein with a polyisocyanate in the presence of an amine catalyst having a retarding effect. The amine catalyst is comprised of (a) 30 to 50 parts by weight of triethylene diamine, (b) 30 to 50 parts by weight of bis(dimethylaminoethyl)ether and/or N,N',N",N"-pentamethyldiethylene triamine, (c) up to 40 parts by weight of tetramethylhexamethylene diamine and/or trimethylaminoethylpiperazine, and (d) formic acid in an amount of 0.2 to 1.5 moles per mole of triethylene diamine.

Abstract: Process for producing a high density elastic polyurethane of reduced weight having excellent resistance to bending, which employs as catalyst 4-methyl-1-(2-dimethylaminoethyl)piperazine or a mixture of 4-methyl-1-(2-dimethylaminoethyl)piperazine and another tertiary amine compound as co-catalyst.

Abstract: The disclosed catalyst for polyurethane comprises an organic carboxylic acid salt of a tertiary amine compound and 1-methyl-4-(2-dimethylaminoethyl)piperazine. The tertiary amine compound is selected from the group of triethylenediamine, bis(2-dimethylaminoethyl)ether and N,N,N',N",N"-pentamethyldiethylenetriamine and the organic carboxylic acid is selected from the organic carboxylic acids having 1-20 carbon atoms.