Production of polyisocyanurate foams having a reduced...

Details Production of polyisocyanurate foams having a reduced... Production of polyisocyanurate foams having a reduced...

C - Chemistry, Metallurgy

08

G

C08G 18/64 (2006.01) C08G 18/40 (2006.01) C08J 9/04 (2006.01) C08J 9/14 (2006.01) C08J 11/24 (2006.01)

Patent

CA 2216772

Polyisocyanurate foams having a reduced thermal conductivity are produced by reacting a) organic and/or modified organic polyisocyanates with b) at least one relatively high molecular weight compound containing at least two reactive hydrogen atoms and, if desired c) low molecular weight chain extenders and/or crosslinkers in the presence of d) catalysts, e) if desired, blowing agents f) and, if desired, further auxiliaries and/or additives, wherein the component b) used comprises at least one recycled polyol which is obtained by glycolysis of polyisocyanurate foams using carrier polyols having an OH number of at most 500 mg KOH/g and a molar mass of at least 450 g/mol. The PIR foams produced by this process can be used for thermal insulation.

Mousses de polyisocyanurate possédant une conductivité thermique réduite, produites par réaction a) de polyisocyanates organiques et (ou) organiques modifiés avec b) au moins un composé de masse molaire relativement élevée, contenant au moins deux atomes d'hydrogène réactifs et, si souhaités c) des extenseurs de chaîne, de faible masse molaire, et (ou) des réticulants en présence de d) catalyseurs e) si souhaités, des agents d'expansion, f) et, si souhaités, d'autres agents d'appoint et (ou) additifs; le constituant b utilisé renferme au moins un polyol recyclé, obtenu par glycolyse de mousses de polyisocyanurate à l'aide de polyols véhicules possédant un indice d'OH d'au plus 500 mg KOH/g et une masse molaire d'au moins 450 g/mole. Les mousse PIR produites par cette méthode peuvent servir pour l'isolation thermique.

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