2010 TRI/PRINCETON CONFERENCE 107 higher wet comb energies for tresses treated with the shampoos containing PQ-67 and jojoba and meadowfoam seed oil were unexpected. Coeffi cient of friction reduction. Coeffi cient of friction measurements were performed on dry hair after treatment with the shampoo. The friction results are shown in Figure 7. The results in Figure 7 show that guar hydroxypropyltrimonium chloride polymer GHPTC-2 and the DEV-1 developmental system deliver the lowest friction to VB hair from jojoba shampoos, consistent with their high level of oil deposition from this shampoo. For tresses treated with shampoos containing meadowfoam seed oil, shampoos containing either PQ-67 polymer or the DEV-1 developmental system were found to deliver the lowest friction to VB hair. As shown in Figure 7, the coeffi cient of friction measured on hair treated with shampoos containing dimethicanol. SUMMARY The results of this study show that acrylamidopropyltrimonium chloride/acrylamide co- polymer APTAC/Acm, DEV-1 developmental polymer system, and guar hydroxypropyl- trimonium choride polymer GHPTC-2: signifi cantly enhance deposition of jojoba, meadowfoam and dimethicanol oils from 1. the shampoo formulation used in this study, relative to a control shampoo formulation containing no cationic polymer. deliver the greatest reduction in wet comb energy when applied to virgin brown hair 2. of all the polymers included in this study. The polyquaternium-67 polymer enhances jojoba and meadowfoam oil deposition rela- tive to the control shampoo that contained no polymer, but PQ-67 shows only minor Figure 6. Wet comb energies for virgin brown hair treated with conditioning oil shampoos.

JOURNAL OF COSMETIC SCIENCE 108 enhancements in dimethicanol microemulsion deposition. Shampoos containing poly- quaternium-10 polymer and guar hydroxypropyltrimonium chloride GHPTC-1 enhance deposition of jojoba and meadowfoam oil on to virgin brown hair, but less effi ciently than shampoos containing the acrylamidopropyltrimonium chloride/acrylamide copolymer APTAC/Acm, DEV-1 developmental system, or guar hydroxypropyltrimonium chloride polymer GHPTC-2. The conditioning polymer technology approaches 1) acrylamidopropyltrimonium chlo- ride/acrylamide copolymer, 2) guar hydroxypropyltrimonium chloride polymer, and 3) the new developmental polymer system approach, deliver superior deposition of natural conditioning oils and dimethicone materials from anionic/amphoteric surfactant cleans- ing formulations as well as good conditioning performance. These new polymer tech- nologies offer formulators the ability to improve uniformity of deposition (2) as well as deposition effi ciency of conditioning agents onto hair. REFERENCES (1) R. Y. Lochhead and L. R. Huisinga, “Advances in Polymers for Hair Conditioning Shampoos,” in Hair Care: From Physiology to Formulation, Angela C. Kozlowski, Ed. (Allured Business Media, Carol Stream, IL, 2008) pp. 123–136. (2) P. E. Erazo-Majewicz, J. A. Graham, and C. R. Usher, Assessing the targeted conditioning performance of cationic polymers, Cosmet. Toiletr., 125, 24–30 (2010). (3) T. K. Miwa, Structural determination and uses of jojoba oil, J. Amer. Oil Chemists Soc., 61, 407–410 (1984). Figure 7. Coeffi cient of friction for shampoo-treated virgin brown hair.