Patent ID: 6881783

Claim:
Process for preparing a polyol comprising particulate material in dispersed form, the amount of particulate material being 30-80% by weight calculated on the total composition wherein an isocyanate reactive compound comprising a plurality of hydroxyl, primary amine and/or secondary amine groups and having an equivalent weight of up to 400 is emulsified in a polyol, having an equivalent weight of 1000-5000 and an average nominal hydroxy functionality of 2-6, at a temperature of 60-100° C. under high shear mixing conditions, a diphenylmethane diisocyanate optionally comprising homologues thereof having an isocyanate functionality of 3 or more and/or modified variants of such polyisocyanates, is added gradually to the emulsion so formed while maintaining the temperature between 60-120° C. and while maintaining high shear conditions, the reacting mixture, obtained after all polyisocyanate has been added, is allowed to react further for a period of time of 10 minutes—2 hours while maintaining the temperature between 60-120° C., the high shear mixing is discontinued, and optionally the polyol so obtained and comprising the particulate material in an amount of 30-80% by weight in dispersed form is cooled to ambient temperature.