| abstract |
A process is provided for producing a polyurethane foam having a high-density skin layer by reacting a polyol with a polyisocyanate in a short time. The reaction is allowed to proceed in the presence of a blowing agent, a catalyst, and optionally an additive, the blowing agent being composed only of water, and the catalyst being an amine represented by formula (I) below and/or an organic acid salt thereof: (* CHEMICAL STRUCTURE *) (I) where R1, R2, R3, and R4 are, independently, an alkyl group of 1 to 12 carbons, or R1 and R2, and/or R3 and R4 may be linked to form a cycloalkyl or heterocyclic ring together with the adjacent nitrogen atom; and R5 is hydrogen, an alkyl group of 1 to 12 carbons, a phenyl group, or a cycloalkyl group. This process does not use halogenated hydrocarbons which cause ozone layer destruction. |