New flexible polyurethane foams

Details New flexible polyurethane foams New flexible polyurethane foams

C - Chemistry, Metallurgy

08

G

C08G 18/66 (2006.01) B29C 44/56 (2006.01)

Patent

CA 2268199

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 and by crushing the rigid foam so obtained in a direction perpendicular to the direction of rise of the foam. Flexible foams are obtained which do not show a major glass transition temperature between - 100 ~C and +25 ~C and which have an anisotropy of 1.80 to 4.00.

Ce procédé de préparation d'une mousse souple de polyuréthane, consiste à faire réagir un polyisocyanate et deux polyols différents dans des conditions de formation de mousse, de manière à préparer une mousse rigide et à écraser la mousse ainsi obtenue perpendiculairement au sens de montée de la mousse. Les mousses obtenues sont des mousses souples sans température majeure de transition vitreuse entre -100 ·C et +25 ·C, pour une anisotropie de 1,80 à 4,00.

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