METHOD FOR PREPARING ELASTIC POLYURETHANE FOAM Russian patent published in 2003 - IPC

FIELD: polymers, chemical technology. SUBSTANCE: invention relates to method for preparing diphenylmethane diisocyanate-base molded elastic polyurethane foams that can be used for making automobile furniture seats and backs, mattresses and pillows. Invention describes method for preparing elastic polyurethane foam with index NCO 70-120 by interaction of polyisocyanate composition with functionality value below 2.15 consisting of diphenylmethane diisocyanate and its homologs with isocyanate functionality value 3 or above with polyols composition comprising polyoxyethylene-polyoxy- propylenepolyol, water, polyesterpolyol with mean equivalent mass 200-600 Da. Material as particles dispersed in indicated composition of polyols. Invention describes also polyurethane foam plastic with density from 20 to 45 kg/m³ and elasticity 60% or above. Invention provides reducing elastic polyurethane foam density and retention of its physical properties. EFFECT: improved preparing method, valuable properties. 13 cl, 1 tbl, 9 ex