Preparation of polyurethane foams

Details Preparation of polyurethane foams Preparation of polyurethane foams

C - Chemistry, Metallurgy

08

G

C08G 18/12 (2006.01) C08G 18/22 (2006.01) C08G 18/48 (2006.01) C08G 18/50 (2006.01) C08G 18/65 (2006.01) C08G 18/66 (2006.01) C08J 9/00 (2006.01) C08L 75/08 (2006.01)

Patent

CA 2122973

A process for the preparation of polyurethane foams, preferably semirigid polyurethane foams, having an improved foam structure involves reacting: a) organic and/or modified organic polyisocyanates with b) polyhydroxyl compounds containing at least 2 reactive hydrogen atoms and c) crosslinking agents which comprise at least one polyoxyalkylene-polyol having a mean functionality of from 3 to 8 and a hydroxyl number of from 200 to 1300 ppm and a content of alkali metal ions of from 150 to 1200 ppm, in the presence of: d) blowing agents, e) if desired catalysts, f) inorganic and/or organic acids as additives and g) if desired auxiliaries.

Un procédé pour la préparation de mousses de polyuréthane, préférablement de mousses de polyuréthane semi-rigides, ayant une structure de mousse améliorée comporte la réaction : a) d'un polyisocyanate organique et/ou organique modifié avec b) des composés polyhydroxylés contenant au moins 2 atomes d'hydrogène réactifs et c) des agents de réticulation qui comprennent au moins un polyoxyalkylène-polyol ayant une fonctionnalité moyenne de 3 à 8 et un indice d'hydroxyle de 200 à 1 300 ppm et une teneur en ions de métal alcalin de 150 à 1 200 ppm, en présence : d) d'agents gonflants, e) au besoin, de catalyseurs, f) d'acides inorganiques et/ou organiques comme additifs et g) au besoin, d'auxiliaires.

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