Process for preparing flexible polyurethane foam with fire performance improved.

摘要

The invention relates to a PREPAREDNESS polyurethane foam FLEXIBLE PROCEDURE WITH A PERFORMANCE AGAINST FIRE ENHANCED, which comprises reacting: a) an isocyanate component CONTAINING free NCO groups from 30 to 35% WEIGHT formed by a COMPRISING MIXTURE: I) 20 to 30% w / w of toluene diisocyanate (TDI); II) 30-50% w / w of oligomers of TDI with an isocyanate functionality of between 3 and 4; III) 30-40% w / w of diphenylmethane diisocyanate (MDI), CONTAINING 2,4'- 'exceeding 40% P / P; B) a polyol component comprising at least one polyol with an equal or greater than 2 FUNCTIONALITY EQUIVALENT WEIGHT 500 A 4000 and 1.5-6% w / w, based on the polyol, WATER.