Method for producing closed-cell rigid polyurethane foams...

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/48 (2006.01) C08G 18/50 (2006.01) C08J 9/12 (2006.01) C08J 9/14 (2006.01)

Patent

CA 2292510

Closed cell rigid polyurethane foams are produced by reacting a) a polyol component with b) a polyisocyanate having an NCO content of from about 20 to about 48% by weight. The polyol component a) includes: 1) from 40 to 80% by weight, based on the total weight of polyol component a), of a sucrose or sorbitol initiated polyether having a molecular weight of from about 300 to about 800; 2) from 3 to 40% by weight, based on the total weight of polyol component a), of an aromatic amine initiated polyether having a molecular weight of from about 300 to about 800; 3) from 3 to 40% by weight, based on the total weight of polyol component a), of an aliphatic amine initiated polyether having a molecular weight of from about 200 to about 800; 4) from 3 to 40% by weight, based on the total weight of polyol component a), of a linear polyether having a molecular weight of from about 500 to about 1500; optionally, 5) other compounds containing at least isocyanate-reactive hydrogen atoms having a molecular weight of from about 150 to about 12,500; 6) a catalyst; 7) water; 8) a foaming agent; and optionally, 9) a processing aid and/or additive.

L'invention concerne un procédé de production de mousses rigides de polyuréthanne à partir de polyols et polyisocyanates, ainsi que d'agents d'expansion et éventuellement d'agents moussants, procédé dans lequel on obtient la mousse rigide de polyuréthanne par réaction A. d'un constituant polyol contenant (1) 40 à 80 % en poids d'un oxyde de polyéthylène/d'un polyéther d'oxyde de propylène de masse molaire 300 à 800, à base de saccharose ou de sorbitol, (2) 3 à 40 % en poids d'un oxyde de polyéthylène/d'un polyéther d'oxyde de propylène de masse molaire 300 à 800, à base d'une mono, di ou polyamine aromatique, (3) 3 à 40 % en poids d'un oxyde de polyéthylène/d'un polyéther d'oxyde de propylène de masse molaire 200 à 800, à base d'une mono, di ou polyamine aliphatique, (4) 3 à 40 % en poids d'un oxyde de polyéthylène/d'un polyéther d'oxyde de propylène linéaire de masse molaire 500 à 1500, (5) éventuellement d'autres composés de poids moléculaire 150 à 12500 g/mole comportant au moins deux atomes d'hydrogène réagissant aux isocyanates, (6) des catalyseurs, (7) de l'eau, (8) des agents d'expansion du groupe des alcanes, cycloalcanes, hydrochlorofluorocarbures et hydrofluorocarbures, (9) éventuellement des agents auxiliaires et/ou des additifs avec B. un polyisocyanate organique et/ou organique modifié avec une teneur en NCO de 20 à 48 % en poids.

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