Process for producing rigid polyurethane foams

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/36 (2006.01) C08G 18/48 (2006.01) C08G 18/50 (2006.01) C08G 18/66 (2006.01) C08J 9/14 (2006.01)

Patent

CA 2755754

The invention relates to a method for producing rigid polyurethane foams, wherein a mixture of one or more highly functional polyether alcohols having functionalities of (3.5) to (5.5) and a hydroxyl value of (350) to (550) mg KOH/g, one or more polyether alcohols based on aliphatic and/or aromatic amines having functionalities of (3) to (4) and a hydroxyl value of (150) to (800) mg KOH/g, a fatty acid ester containing OH groups, and optionally one or more low-molecular-weight chain exten-ders and/or cross-linking agents having functionalities of (2) to (3) and a molecular weight M w < (400) g/mol is used as a polyol component. The obtained rigid polyurethane foams are characterized by good surface properties.

L'invention porte sur un procédé de fabrication de mousses rigides de polyuréthane, suivant lequel on utilise en tant que composant polyol un mélange d'un ou plusieurs polyéther-alcools à haute fonctionnalité, ayant une fonctionnalité de (3,5) à (5,5) et un indice d'hydroxyle de (350) à (550) mg KOH/g, d'un ou plusieurs polyéther-alcools à base d'amines aliphatiques et/ou aromatiques ayant une fonctionnalité de (3) à (4) et un indice d'hydroxyle de (150) à (800) mg KOH/g, d'un ester d'acide gras contenant des groupes OH, et éventuellement d'un ou plusieurs agents d'extension de chaîne et/ou agents de réticulation à faible masse moléculaire, ayant une fonctionnalité de (2) à (3) et une masse moléculaire Mw < (400) g/mol. Les mousses rigides de polyuréthane ainsi obtenues se caractérisent par une bonne qualité superficielle.

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