Flexible polyurethane foam based on mdi

Details Flexible polyurethane foam based on mdi Flexible polyurethane foam based on mdi

C - Chemistry, Metallurgy

08

G

402/136, 403/41,

C08G 18/48 (2006.01) C08G 18/66 (2006.01) C08G 18/76 (2006.01) C08G 18/79 (2006.01)

Patent

CA 1194642

Abstract of the Disclosure A flexible, hydrophilic polyurethane foam is produced by mixing together an aqueous phase which can optionally contain reinforcing fibers and surfactants and a resin phase comprising a prepolymer derived from a poly (oxy C2-4 alkylene) diol, an MDI containing isocyanate product having a functionality greater than 2.0 made of a mixture of MDI and isocyanate containing derivatives of MDI, and either a monomeric polyol crosslinking agent having 3 or 4 hydroxyl equivalents per mole in one embodiment or a polymeric poly (oxy C2-4 alkylene) polyol crosslinking agent having 3 or 4 hydroxyl equivalents per mole and a molecular weight of at least 500 in the other embodiment. The preferred monomer polyol is trimethylolpropane while the preferred polymeric polyol is Poly G176-120 which is a poly (oxyethylene) triol. The isocyanate containing product comprises less than 50% by weight of the prepolymer and Isonate 143L is the preferred isocyanate product.

410682

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