Process for making rigid polyurethane foams

Details Process for making rigid polyurethane foams Process for making rigid polyurethane foams

C - Chemistry, Metallurgy

08

G

C08G 18/40 (2006.01) C08G 18/42 (2006.01) C08G 18/48 (2006.01)

Patent

CA 2557193

Process for making rigid polyurethane or urethane-modified polyisocyanurate foams at an isocyanate index of between 110 and 120 comprising the step of reacting an organic polyisocyanate composition with an isocyanate-reactive composition in the presence off a hydrocarbon as blowing agent wherein the isocyanate-reactive composition contains between 3 and 30 wt% of polyester polyols and between 20 and 50 wt% of polyether polyols derived from aromatic amines, the amounts being calculated on the basis of total isocyanate-reactive compound.

Cette invention se rapporte à un procédé servant à fabriquer des mousses de polyuréthane ou de poly-isocyanurate modifié par uréthane avec un indice d'isocyanate compris entre 110 et 120, ce procédé consistant à faire réagir une composition de poly-isocyanate avec une composition réactive à l'isocyanate en présence d'un hydrocarbure comme agent gonflant, la composition réactive à l'isocyanate contenant entre 3 et 30 % en poids de polyols de polyester et entre 20 et 50 % en poids de polyols de polyéther dérivés d'amines aromatiques, ces quantités étant calculées sur la base du composé total réactif à l'isocyanate.

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