FLEXIBLE POLYURETHANE FOAM

摘要

A flexible polyurethane foam having a density of 3 comprises a reaction product of a polyisocyanate composition and an isocyanate-reactive composition. The polyisocyanate composition comprises a polymeric MDI component and a monomeric MDI component comprising 2,4'-MDI that is present in the monomeric MDI in an amount > 35 parts by weight of the 2,4'-MDI based on 100 parts by weight of the monomeric MDI. The isocyanate-reactive composition comprises a primary hydroxyl- terminated graft polyether polyol and a second polyol different from the primary hydroxyl-terminated graft polyether polyol. The primary hydroxyl-terminated graft polyether polyol comprises a carrier polyol and particles of co-polymerized styrene and acrylonitrile. The carrier polyol has a weight average molecular weight of > 3,500 g/mol.