C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 18/00 (2006.01) C08G 18/10 (2006.01) C08G 18/40 (2006.01)
Patent
CA 2302191
The present invention is directed to a low density flexible polyurethane foam and the process of making the same from a polyisocyanate composition and an isocyanate reactive composition wherein the polyisocyanate composition comprises a semi-prepolymer which is the reaction product of an excess of a base isocyanate formulation with a polyoxyethylene polyol, said base isocyanate formulation comprising a mixture of diphenylmethane diisocyanate and polyphenylpolymethylene polyisocyanate, said diphenylmethane diisocyanate comprising, <u>inter</u> <u>alia</u>, 2,4'-MDI in prescribed amounts, whereby the functionality of the base isocyanate formulation ranges from 2.07 to 2.12 and said isocyanate reactive composition comprises water, a second polyoxyethylene polyol, a cross-linker and catalyst.
L'invention concerne une mousse de polyuréthane souple et à faible densité et son procédé de fabrication à partir d'une composition de polyisocyanate et d'une composition réactive d'isocyanate. Ladite composition d'isocyanate comprend un pré-polymère qui est le produit de réaction d'un excédent d'une formulation d'isocyanate de base et de polyol de polyoxyéthylène, ladite formulation d'isocyanate de base contenant un mélange de diisocyanate de diphénylméthane et de polyisocyanate de polyphénylpolyméthylène. Ledit diisocyanate de diphénylméthane comprend, <u>entre autres</u>, 2,4'-MDI en quantités prédéterminées. La fonctionnalité de la formulation d'isocyanate de base est comprise entre 2,07 et 2,12 et ladite composition réactive d'isocyanate comprend de l'eau, un deuxième polyol de polyoxyéthylène, un agent de réticulation et un catalyseur.
Huntsman Ici Chemicals Llc
Smart & Biggar
LandOfFree
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