| abstract |
The present invention relates to a process for preparing a polyurethane foam comprising reacting a polyether polyol with a polyisocyanate in the presence of a blowing agent and an antioxidant, wherein: the antioxidant is one phenolic antioxidant or two or more phenols Consisting of antioxidants, the one or more phenolic antioxidants do not contain atoms other than carbon, hydrogen and oxygen, and the amount of the one or more phenolic antioxidants is 2,300 to less than 10,000 by weight based on polyether polyol Fraction (ppmw); The isocyanate index is greater than 100; The maximum temperature during the preparation of the polyurethane foam is greater than 140°C; And the density of the polyurethane foam is less than 25 kg / m 3 . In addition, the present invention relates to a polyurethane foam obtainable by the process, a shaped article comprising the polyurethane foam, and a polyether polyol composition that can be used in the process. |