Patent ID: 9624336
Date: 2017-04-18
CPC Classifications: C08G,C08J

Claim:
1. A polyurethane foam obtained from a polyurethane raw material containing polyol, isocyanate, a foam stabilizer, a catalyst and a foam-forming gas by a mechanical froth method, wherein the polyol contains a castor oil-based polyol having a viscosity at 25° C. of 2,000 mPa·s or less, and a polyether-based polyol, the castor oil-based polyol is contained in an amount of from 20 to 80 parts by weight per 100 parts by weight of the polyol, the polyether-based polyol is contained in an amount of from 20 to 80 parts by weight per 100 parts by weight of the polyol, the polyurethane foam has an apparent density of from 100 to 700 kg/m the polyol contains the polyether-based polyol in which an ethylene oxide ratio that is a proportion of an oxyethylene unit in polyoxyalkylene is 50 mol % or more, in an amount of from 20 to 80 parts by weight per 100 parts by weight of the polyol, the total amount of the polyether-based polyol in which the ethylene oxide ratio is 50 mol % or more, and the castor oil-based polyol is from 50 to 100 parts by weight per 100 parts by weight of the polyol, and the polyurethane foam has an average cell diameter of from 50 to 300 μm.