Rigid polyurethane foams

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/32 (2006.01) C08G 18/38 (2006.01) C08G 18/48 (2006.01) C08J 9/00 (2006.01) C08J 9/14 (2006.01) E04B 1/80 (2006.01)

Patent

CA 2166071

Process for the preparation of rigid polyurethane foams comprising the step of reacting an organic polyisocyanate with an isocyanate- reactive material in the presence of a blowing promotor which is an isocyanate-reactive cyclic carbonate or cyclic urea, and in the presence of an inert, insoluble organic liquid and a metal salt catalyst and a polyether polyol of average nominal functionality 2 to 6 and number average equivalent molecular weight between 1000 and 2000.

Ce procédé de préparation des mousses rigides de polyuréthanne comporte une réaction d'un polyisocyanate organique avec un produit réagissant à l'isocyanate en présence d'un agent gonflant pour mousse, en l'occurence un carbonate cyclique ou une urée cyclique réagissant à l'isocyanate, puis une seconde étape, le tout, en présence d'un liquide organique insoluble inerte et d'un catalyseur sous forme de sel métallique ainsi que d'un polyol de polyéther dont la valence fonctionnelle nominale moyenne va de 2 à 6 et dont l'équivalent moyen en nombre de la masse moléculaire se situe entre 1000 et 2000.

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