Procedure for obtaining soft flexible polyurethane foams with viscoelastic and damping properties of sound and mixtures corporeo polyoxyalkylene polyol used for this purpose.

摘要

INVENTION: PROCEDURE INVOLVES A; WHAT TO PRODUCE FOAM soft and flexible polyurethane employed with viscoelastic properties AND SOUND ABSORBING at a temperature between -20 and 80 CY MIXER comprises treating polyoxyalkylene polyol-modified organic polyisocyanates in the presence of catalysts, solvents ( WATER), AUXILIARY SUBSTANCES AND ADDITIVES USUAL AND DESCRIBE MIXTURES polyoxyalkylene polyol containing a mixture BLOCK polyoxypropylene-POLIETILENO polyol have a number of HIDROXI 14 TO 65 AND CONTENT ethylene oxide units 2 to 9% by weight relative to the weight of the polyoxypropylene units and are obtained by polymerizing 1,2-propylene oxide anion with a functionality of 2.3 to 2.8, at elevated temperature and in presence of water, glycerol and / O trimethylolpropane and polymerization of ethylene oxide in the adduct polyoxypropylene.