FIELD: chemistry of polymers. SUBSTANCE: described is porous polyurethane polymer obtained by reaction of polyetherpolyol weight which comprises from 2 to 4 hydroxy groups per molecule and has equivalent weight from 150 to 500 and from 35 to 75 wt % of polyetherpolyol which comprises from 1 to 6 hydroxy group of at least 50 wt % of oxyethylene per molecule and has equivalent weight from 600 to 3000, and polyisocyanate which has average isocyanate functionality of 2.3-3.5 and comprises methylenediphenyl isocyanate and at least 40 wt % of polymethylene polypthenyl isocyanate and at least 40 wt % of polymethylene polyphenyl isocyanate and at least 40 wt % of polymethylene polyphenyl isocyanate and which has open or interconnected porous structure of total density from 20 to 40 kg/sq.m. at thickness of 75 mm. Said polymer has value of equal or less than 75 mm or less for static stain of greater or equal to 2.75 kPa. EFFECT: simplified process. 10 cl, 2 ex, 3 tbl
