Polymer-modified polyol dispersions and processes for production and use thereof

A process for producing a polymer-modified polyol dispersion comprising the steps of:

• (i) reacting an isocyanate and a first olamine in the presence of a substantially inert polyol to produce a reaction mixture;
• and
• (ii) adding a second olamine which may be the same as or different from the first olamine to the reaction mixture prior to completion of the reaction between the isocyanate and the first olamine to produce the polymer-modified polyol dispersion.

A process for producing a polyurethane comprising the step of reacting a polymer-modified polyol dispersion, a catalyst and an isocyanate;

• wherein the polymer-modified polyol dispersion comprises a polyaddition product dispersed in a polyol, the polyaddition product being present in an amount of from about 25 to about 70 percent by weight based on the total weight of the polyaddition product and the polyol, the dispersion having a viscosity in the range of from about 4,000 to about 50,000 mPa.s, the viscosity remaining substantially the same after production of the polymer-modified polyol dispersion.