2010 TRI/PRINCETON CONFERENCE 187 Figure 7. Percent solids in foam and liquid phases as a function of dilution in water for (A) Polyquatrnium-7, (B) Polyquaternium-10, (C) Polyquaternium-76, and (D) Polyquaternium-88.

JOURNAL OF COSMETIC SCIENCE 188 Figure 9. FT-IR derived ratio of polymer in foam phase to liquid phase. Figure 8. FT-IR of polymers and surfactant. coacervates, form upon dilution of a concentrated polymer/surfactant solution, and de- posit directly onto the hair and skin to provide conditioning effects as well as deposit other molecules to achieve lasting feel. These complexes are found in the foam and liq- uid phases. Our experiments, reported here, have shown that there is no preferential concentration of polymer in the foam phase compared to the liquid phase for all of the polymers studied. We conclude, therefore, that foam fractionation of the polymer/sur- factant coacervate is unlikely to be an important factor in the topical delivery of these coacervates. ACKNOWLEDGMENTS The authors are grateful for technical assistance and scientifi c advice from E.D. Smith and S. McConaughy of Procter & Gamble.