Patent ID: 7674853
Filing Date: 2010-03-09
Classification: C08G

Abstract:
1. Process for preparing a polyol composition having a viscosity of 1500-25000 mPa·s at 25° C., a glass transition temperature of at least 80° C. and at least 90% by volume of the particulate material has a particle size of 10 μm or less, by emulsifying a polyol having an average equivalent weight of up to 400 in a polyol having an average equivalent weight of 500 or more at a temperature of 20-70° C., adding a polyisocyanate to the emulsion, wherein the entire process is conducted under high shear mixing conditions, the temperature is kept below 150° C., the temperature may be allowed to become 120° C. or more for not more than 2 hours, the temperature is kept at least 20° C. higher than the T g of the particulate material formed at that stage, the used amount of the polyol having an average equivalent weight of up to 400 and polyisocyanate together at the end of the polyisocyanate addition is 35-80% by weight calculated on the weight of the polyol composition, and the number of isocyanate groups used per 100 isocyanate-reactive groups in the polyol having an average equivalent weight of up to 400 is 75-98.