A process for the production of rigid and semi-rigid foams...

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/40 (2006.01) C08G 18/63 (2006.01) C08G 18/72 (2006.01) C08G 18/76 (2006.01)

Patent

CA 2652552

This invention relates to a process for the production of rigid and semi-rigid foams at low isocyanate levels, and to the foams produced by this process. The process comprises reacting a polyisocyanate component with an isocyanate-reactive component, in the presence of at least one blowing agent, at least one surfactant and at least one catalyst. Suitable isocyanate-reactive components are characterized as having a solids content of at least 40 % by weight, and an overall hydroxyl number of the remaining liquid, non-solids portion of at least 160. In addition, the isocyanate-reactive component comprises at least 50 % by weight of a polymer polyol having a solids content of at least 30 % by weight and in which the base polyol has a hydroxyl number of at least 75.

Cette invention concerne un procédé pour la production de mousses rigides et semi-rigides avec de faibles niveaux d'isocyanates et les mousses produites par ce procédé. Le procédé consiste à faire réagir un composant polyisocyanate avec un composant réactif avec les isocyanates, en présence d'au moins un agent d'expansion, d'au moins un tensioactif et d'au moins un catalyseur. Les composants réactifs avec les isocyanates appropriés sont caractérisés en ce qu'ils ont une teneur en matières solides d'au moins 40 % en poids et un indice d'hydroxyle global de la partie liquide ne comprenant pas de matières solides restante d'au moins 160. En plus, le composant réactif avec les isocyanates comprend au moins 50 % en poids d'un polyol polymère ayant une teneur en matières solides d'au moins 30 % en poids et dans lequel le polyol de base a un indice d'hydroxyle d'au moins 75.

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