2008 TRI/PRINCETON CONFERENCE 247 guar in 15.5% SLES-/DSCADA/1% silicone at less than half the polymer concentration (0.1% experimental polymer 0.25% cationic guar) for both wet and dry properties. As can be seen in Figure 6, even after up to 10 washes, the experimental polymer performs at least as well as cationic guar, indicating an increased level of silicone deposition does not affect performance after many wash cycles. To confi rm the benefi ts of 2-in-1 shampoos formulated with the new polymer, an additional study was done to compare the condi- tioning performance with PQ7. As with cationic guar, the experimental polymer was used at 0.1% vs. 0.25% for PQ7. Figure 7 shows similar or better performance of the experimental polymer (4967 mg/kg silicone deposited) vs. PQ7 (1091 mg/kg silicone de- posited), ruling out a general panel bias against cationic guar in the fi rst series of studies. While it was established that the experimental polymer can deposit large amounts of silicone on hair, it is unclear whether this level of silicone is needed to obtain good con- ditioning properties. As with most cationic conditioning polymers, the experimental Figure 5. Panel study comparing experimental polymer with cationic guar in 15.5% SLES-2/2.6% DSCADA/1% silicone. Wet and dry comb and feel was evaluated. Black: 0.25% cationic guar gray: 0.1% experimental polymer. Figure 6. Panel study comparing experimental polymer with cationic guar after 10 washes in 15.5% SLES- 2/2.6% DSCADA/1% silicone base. Wet and dry comb and feel was evaluated. Black: 0.25% cationic guar gray: 0.1% experimental polymer.

JOURNAL OF COSMETIC SCIENCE 248 polymer likely binds to the hair to impart its own conditioning properties. The 2-in-1 shampoos give extra conditioning with silicone, but in essence the polymer and silicone work together to maximize performance. There is also a continued need in the competi- tive shampoo market to reduce overall formulation cost while maintaining product per- formance. Several studies were done to evaluate the effectiveness of silicone deposition and wet and dry comb and feel with reduced concentrations of silicone in the formula- tion. The panel study shown in Figure 8 indicates that even at 1/10 the silicone concen- Figure 7. Panel study comparing experimental polymer with PQ7 in 15.5% SLES-2/2.6% DSCADA/1% sili- cone base. Wet and dry comb and feel was evaluated. Black: 0.25% PQ7 gray: 0.1% experimental polymer. Figure 8. Panel study comparing experimental polymer with cationic guar in 15.5% SLES-2/2.6% DSCADA base. Wet and dry comb and feel was evaluated. Black: 0.25% cationic guar, 1% silicone gray: 0.1% experi- mental polymer, 0.1% silicone.