Patent ID: 6946497
Filing Date: 2005-09-20
Classification: C08G

Abstract:
1. A process for preparing a visco-elastic polyurethane foam at an NCO index of 70-120 by reacting: a) a polyisocyanate composition; b1) a polyoxyethylene-polyoxypropylene polyol, having an average equivalent weight between 800 and 4000 and an average nominal hydroxy functionality of 2-6, where the EO is present as random EO and/or tipped EO, the total EO content being at least 50% by weight; b2) a polyoxyethylene-polyoxypropylene polyol, having an average equivalent weight between 800 and 4000 and an average nominal hydroxy functionality of 2-6, where the EO is present as tipped EO and/or random EO, the total EO content being between 20 and 50% by weight, having a primary hydroxy content of at least 50% calculated on the amount of primary and secondary hydroxyl groups; b3) a polyoxyethylene-polyoxypropylene polyol, having an average equivalent weight between 800 and 4000 and an average nominal hydroxyl functionality of 2-6, having a primary hydroxy content of at least 50% calculated on the amount of primary and secondary hydroxyl groups, and having an EO content of from 10 to 20% by weight; b4) a polyoxyalkyleneglycol having an average molecular weight from 100 to 1200; b5) a polyoxyalkylene monool having a molecular weight of at least 120; these compounds b1, b2, b3, b4 and b5 being reacted according to the following proportions, based on the combined weights of b1, b2, b3, b4 and b5, b1: 30-85 wt %, b2: 5-50 wt %, b3: 2-30 wt %, b4: 0-50 wt %, b5: 1-2 wt %; c) water; and optionally d) additives and auxiliaries known per se.