In situ blown foams

Details In situ blown foams In situ blown foams

C - Chemistry, Metallurgy

08

J

C08J 9/08 (2006.01) C08G 18/54 (2006.01) C08L 61/10 (2006.01)

Patent

CA 2198629

The invention forms in situ carbon dioxide blown closed-cell insulating foams in which blowing is achieved by the evolution of carbon dioxide resulting from partial hydrolysis of polyisocyanate (methyl diphenyl diisocyanate) by water in the resole. The invention uses no additional blowing agent. The reaction is fast and the resulting product has small, closed cells that exhibit long-term thermal performance.

L'invention porte sur des plastiques isolantes à cellules fermées, soufflés in situ au CO¿2?. Le soufflage résulte de la production du CO¿2? par hydrolyse partielle de polyisocyanate(méthyl biphényl diisocyanate) par l'eau présente dans le résol. Aucun agent porogène supplémentaire n'est utilisé dans le procédé de l'invention. La réaction est rapide et le produit final comporte des petites cellules fermées conservant longtemps leurs propriétés d'isolation thermique.

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