Rigid, dimensionally stable polyurethane foams and a process...

Details Rigid, dimensionally stable polyurethane foams and a process... Rigid, dimensionally stable polyurethane foams and a process...

C - Chemistry, Metallurgy

08

G

C08G 18/72 (2006.01) C08G 18/48 (2006.01) C08J 9/22 (2006.01) C08J 9/228 (2006.01) C08L 75/04 (2006.01)

Patent

CA 2462387

Rigid foams are made by reacting a polyisocyanate with an isocyanate-reactive composition which includes at least one isocyanate-reactive compound, preferably, an amine-initiated polyol and more preferably, an amine-initiated polyether polyol and a second, different polyol in the presence of a blowing agent composition which includes water and a catalyst composition which includes two different blowing catalysts, preferably, pentamethyldiethylenetriamine and bis(2- dimethylamino-ethyl)ether.

On prépare des mousses rigides en faisant réagir un polyisocyanate avec une formulation réactive aux isocyanates renfermant au moins un composé réactif aux isocyanates, de préférence un polyol amorcé par une amine ou, idéalement, un polyéther-polyol amorcé par une amine et un second polyol, différent, en présence d'une formulation gonflante renfermant de l'eau et une formulation de catalyseurs constituée de deux catalyseurs gonflants différents, de préférence de la pentaméthyldiéthylènetriamine et du bis(2-diméthylaminoéthyl)éther.

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