Pigment dispersions exhibiting improved compatibility in polyurethane systems

Abstract

A method is described for improving the compatibility of pigments and, optionally, stabilizers in the polyol-containing component of two- and three-component polyurethane systems. The method comprises (A) preparing a dispersion comprising at least one pigment in at least one glycol, and (B) blending said dispersion with the polyol component. In a preferred embodiment, the glycol of the dispersion is identical to the glycol used as the chain extender in the polyol component of the urethane system. The pigment dispersions also may contain at least one stabilizer for the urethane including heat stabilizers and ultraviolet light stabilizers. Compositions are described which comprise at least one pigment and at least one heat and/or ultraviolet light stabilizing compound dispersed in a glycol. Such dispersions exhibit improved compatibility with the polyol component thereby minimizing settling of the pigment resulting in a reduction in the clogging of filters used in the urethane reaction. The improved compatibility also results in the reduction or elimination of color streaking in the urethane product.

Dependencies are inferred from the claim text.