Patent ID: 6417241
Filing Date: 2002-07-09
Classification: C08G,Y10S

Abstract:
A process for preparing a flexible polyurethane foam at an NCO index of 70-120 by reacting in a closed mould,a) a polyisocyanate composition having a functionality below 2.15 and consisting of diphenylmethane diisocyanate and homologues thereof wherein, the amount of diphenylmethane diisocyanate is 81 to 100% by weight calculated on the amount of diphenylmethane diisocyanate and homologues, said diphenylmethane diisocyanate comprising 40-60% by weight, calculated on the weight of diphenylmethane diisocyanate, of diphenylmethane diisocyanate containing at least one NCO group in the ortho position, and wherein the amount of homologues is 19-0% by weight, said homologues having an isocyanate functionality of 3 or more, and b) a polyol composition comprising: 1) a polyoxyethylene-polyoxypropelene-polyol, having an average nominal hydroxyl functionality of 2-6, an average equivalent weight of 1000-4000 and containing 10-25% by weight of oxyethylene groups; 2) 4 to 8 parts by weight of water as the sole blowing agent or optionally together with CO2 as the sole blowing agents; 3) 2 to 20 parts by weight of a polyether polyol having an average nominal hydroxyl functionality of 2, an average equivalent weight of 200-600 and containing at least 60% by weight of oxyethylene groups; and 4) 4 to 25 parts by weight of particulate material which is dispersed in said polyol composition; the amounts of b2) to b4) being calculated per 100 parts by weight of b1); and 5) optionally auxiliaries and additives; wherein said particulate material is the reaction product of a polyisocyanate and a compound having a plurality of hydroxyl, primary amine and/or secondary amine groups and an equivalent weight of up to 400.