Thermally stable rigid foams based on isocyanate and having...

C - Chemistry – Metallurgy – 08 – G

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C08G 18/42 (2006.01) C08G 18/66 (2006.01) C08J 9/14 (2006.01)

Patent

CA 2245291

Thermally stable rigid foams based on isocyanate can be produced by reacting a) polyisocyanates with b) compounds containing at least two hydrogen atoms which can react with isocyanate groups, c) water, in the presence of d) physically acting blowing agents, in the presence or absence of e) catalysts and auxiliaries and/or additives, wherein the component b) comprises bi) at least one polyether alcohol having a functionality of at least 1.5 and a hydroxyl number of from 10 to 100 mg KOH/g in an amount of from 0.2 to 80% by mass, based on b), and bii)at least one polyester alcohol in an amount of from 5 to 90% by mass, based on b), the water c) is present in an amount of at most 2% by mass, based on the sum of the components b) to e), and the component d) used comprises hydrocarbons and/or fluorine-containing hydrocarbons in an amount of from 5 to 30% by mass, based on the sum of the components b) to e).

Enter the French Abstract On peut produire des mousses rigides thermiquement stables, à base d'isocyanate, en faisant réagir : a) des polyisocyanates avec b) des composés renfermant au moins deux atomes d'hydrogène capables de réagir avec des groupements isocyanates et c) de l'eau, en présence d) d'agents d'expansion physiquement actifs et en présence ou en l'absence e) de catalyseurs, d'auxiliaires et/ou d'additifs. Dans ces mousses, le composé b) comprend bi) au moins un polyéther-alcool ayant une fonctionalité d'au moins 1,5 et un indice d'hydroxyle allant de 10 à 100 mg de KOH/g, en quantité allant de 0,2 à 80 %, par rapport au poids de b), et bii) au moins un polyester-alcool en quantité allant de 5 à 90 %, par rapport au poids de b). L'eau c) est présente en quantité représentant au plus 2 % de la somme des poids de b) et e), et le composé d) utilisé est un hydrocarbure et/ou un hydrocarbure fluoré, présent en quantité allant de 5 à 30 %, par rapport à la somme des poids des composés b) et e).

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