Process for producing rigid polyurethane foams and finished...

Details Process for producing rigid polyurethane foams and finished... Process for producing rigid polyurethane foams and finished...

C - Chemistry, Metallurgy

08

G

C08G 18/40 (2006.01) C08J 9/12 (2006.01) C08J 9/14 (2006.01)

Patent

CA 2428436

A process for producing a low-density rigid polyurethane foam by reacting a polyisocyanate and a polyol composition which comprises a hydroxy-terminal polyfunctional polyol component using an expansion system comprising water, liquid CO2 and optionally a hydrofluorocarbon auxiliary expander. The water is present in an amount of less than 1 par by weight per 100 parts of polyol component. The polyurethane foam may be used in the manufacture of heat insulating panels.

L'invention concerne un procédé de production d'une mousse polyuréthanne rigide à faible densité. Ce procédé consiste à faire réagir un polyisocyanate et une composition de polyol renfermant un composant polyol polyfonctionnel à terminaison hydroxy, au moyen d'un système d'expansion comprenant de l'eau, du CO¿2? liquide et éventuellement un expanseur auxiliaire hydrofluorocarboné. L'eau est présente en une quantité inférieure à 1 en poids pour 100 parties de composant polyol. La mousse polyuréthanne peut être utilisée dans la fabrication de panneaux isolants thermiques.

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