Dimensionally-stable polyurethane sponge and sponge- forming...

Details Dimensionally-stable polyurethane sponge and sponge- forming... Dimensionally-stable polyurethane sponge and sponge- forming...

C - Chemistry, Metallurgy

08

G

402/149, 403/35,

C08G 18/66 (2006.01) C08G 18/48 (2006.01) C08G 18/72 (2006.01)

Patent

CA 1179100

Abstract of the Disclosure An MDI based polyurethane foam having cellulose foam properties 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 n 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 a monomeric polyol cross-linking agent having 3 or 4 hydroxyl equivalents per mole. The preferred polyol is trimethylolpropane and the preferred diol is Carbowax?1000. The diol and the polyol, such as trimethylolpropane, are present in a mole ratio in the range of 4:1 to 8:1 while the ratio of the isocyanate equivalents to the total hydroxyl equivalents is in the range of 3:1 to 41. The isocyanate containing product comprises more than 50% by weight of the prepolymer and Isonate?143L is the preferred isocyanate product. The foam has a minimal swell when wet and it does nut curl upon drying.

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