Patent ID: 8901203

Claim:
A process for producing an antimicrobially effective polyurethane which comprises the steps of: (a) dispersing a pyrithione salt(s) in particulate form having a particle size of less than 100 microns in a polyol in the presence of a stabilizer selected from the group consisting of organic clays, fumed silica, synthetic silicate, urethane based associative thickeners, thixotropes, and combinations thereof to provide a dispersion having a viscosity of from about 1,000 cps to about 15,000 cps at 25° C., wherein the dispersion contains from about 10% to about 50% of the pyrithione salt, from about 1% to about 20% of the stabilizer and from about 50% to about 90% of a polyol based upon the weight of the dispersion, (b) contacting the dispersion with a composition containing a polyol component, an isocyanate component and a catalyst promoting the reaction between the polyol component and the isocyanate component to provide a liquid mixture, and (c) reacting the mixture to produce said antimicrobially effective polyurethane.