摘要:
Polyurethane molded foams having a surface region and an interior region and comprising a flame-retardant solid, wherein the flame-retardant solid is present in the surface region in a proportion higher than a proportion of the flame-retardant solid in the interior region; processes for preparing the same; and materials comprising such foams.
摘要:
The present invention concerns a method for the treatment of polyurethane foam, wherein the polyurethane foam is obtainable from a reaction mixture comprising an ethylene oxide/propylene oxide polyol component with an OH number of ≧20 mg KOH/g to ≦45 mg KOH/g and an isocyanate component with an NCO content of ≧20 weight-% to ≦49 weight-% which is selected from the group comprising diphenylmethane diisocyanate, toluene diisocyanate, their prepolymers with an ethylene oxide/propylene oxide polyol whose OH number is from ≧20 mg KOH/g to ≦45 mg KOH/g and/or their allophanates, ureas, biurets, uretdiones, isocyanurates or carbodiimides. The invention further concerns a polyurethane foam which has been treated by such a method. After the foam formation has finished, the polyurethane foam is irradiated with microwave radiation and the irradiated energy, in relation to the volume accessible by the microwave radiation, is from ≧1.0 kilojoules/liter to ≦2.23 kilojoules/liter. Such polyurethane foams may be used as flexible molded foams in furniture applications.