| 摘要 |
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. |
