ELASTIC FOAMED POLYURETHANE AND SYNTHESIS METHOD THEREOF Russian patent published in 2011 - IPC C08G18/12 C08G18/48 C08G101/00 C08J9/12 

FIELD: chemistry.

SUBSTANCE: present invention relates to soft elastic foamed polyurethane with apparent density less than 15 kg/m³ and rigidity in compression less than 1.5 kPa. Said foamed polyurethane is obtained by reacting (a) toluene diisocyanate (TDI) with (b) a mixture of polyols containing (b1) 60-90 pts.wt of at least one polyetherpolyol with nominal functionality of 2-6, content of ethylene oxide links higher than 60 wt %, mainly primary hydroxyl groups and hydroxyl number of 10-112, and (b2) 10-40 pts.wt of at least one polyetherpolyol with nominal functionality 2-6, content of ethylene oxide links of 0-30 wt %, mainly secondary hydroxyl groups and hydroxyl number 8-112, (c) water, (d) carbon dioxide dissolved under pressure in amount of at least 6 pts.wt per 100 pts.wt of component (b), (e) structuring substances if needed, (f) when using silicon-based foam stabilisers, activators, metal catalysts and other auxiliary substances usually used to produce foamed polyurethanes, wherein the isocyanate index is equal 80-100.

EFFECT: obtaining soft elastic foamed polyurethane, having said values of apparent density and rigidity in compression, as well as excellent pore structure using a special mixture of polyols combined with water and carbon dioxide dissolved under pressure as a foaming agent.

5 cl, 3 ex, 1 tbl