Process for making flexible polyurethane foams

C - Chemistry – Metallurgy – 08 – G

Patent

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C08G 18/66 (2006.01) B29C 44/56 (2006.01) C08G 18/65 (2006.01) C08G 18/82 (2006.01) C08J 9/36 (2006.01)

Patent

CA 2268184

Process for preparing a flexible polyurethane foam by reacting a polyisocyanate and two different polyols under foam forming conditions so as to prepare a rigid foam, by crushing the rigid foam so obtained and by subjecting the flexible foam so obtained to a heat treatment. Flexible foams are obtained which do not show a major glass transition temperature between - 100 ~C and +25 ~C.

Dans un procédé de préparation d'une mousse souple de polyuréthane, on fait réagir un polyisocyanate et deux polyols différents dans des conditions de formation de mousse, de manière à préparer une mousse rigide qu'on écrase pour obtenir une mousse souple. On soumet la mousse souple ainsi obtenue à un traitement thermique, ce qui donne des mousses souples ne présentant pas une température majeure de transition vitreuse située entre -100 ·C et +25 ·C.

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