| abstract |
PURPOSE:To provided the subject catalyst composed of a specified imidazole compound and capable of improving surface brittleness of a foam and capable of reducing the amount of CFC used as a foaming agent. CONSTITUTION:An objective catalyst composed of an imidazole compound of the formula (R1 is 1-4C alkyl, benzyl, dimethylaminopropyl or 1-3C hydroxyalkyl; R2 is H, 1-4C alkyl, aryl or benzyl; R3 and R4 are H, methyl or hydroxymethyl) [preferably 1-methylimidazole, 1,2-dimethylimidazole, 1-(3- dimethylaminopropyl)imidazole, 1-n-butyl-2-methylimidazole or 1-isobutyl-2- methylimidazole]. |