SILICONE-QUAT INTERACTIONS 143 100 100 80 80 • 60 • 60 200 20 O[ • • • • • • 0 250 500 750 1000 12•50 1 00 1750 0 250 500 750 1000 1250 1500 1750 2000 Amount Silicon Deposited (gg Si/g hair) Amount Silicon Deposited (gg Si/g hair) 100 80- 60 -• 40- 20- c I I I I 215 250 500 750 1000 1 0 1500 Amount Silicon Deposited ([tg Si/g hair) Figure 6. Dry ( 0 ) and wet (O) combing performance of gum 1 (A), gum 2 (B), and blend (C) in presence of the quat. The values shown at x-axis = 0 are the dry (•) and wet (O) combing benefits of the quat in the absence of any silicones. performance when both silicone and the quat were present together as shown in the table below: Treatment Wet %ACLre o Quat alone Silicone alone (average of all HMWS and LMWS) Silicone and quat (average of all HMWS and LMWS) 3% 43% 87% This is also illustrated in Figure 9A. The synergistic effect of the two simply cannot be explained by the improved deposition of the silicone in the presence of the quat. Similar amounts of silicone deposited on hair, in the absence and in the presence of the quat, display very different wet combing benefits. For example, in Figure 10, a level of 500 !xg silicone/g hair provides a 30% reduction of combing force in the absence of the quat but a 90% reduction in the presence of the quat. Comparison between dry combing in the absence and presence of the quat. There is no advantage in dry combing performance when both silicone and the quat are present together, as compared to the effect of the quat or the silicones alone as shown in the table below:

144 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS Treatment Dry %ACL•e d Quat alone Silicone alone (average of all HMWS) Silicone and quat (average of all HMWS) Silicone alone (average of all LMWS) Silicone and quat (average of all LMWS) 64% 76% 77% 50% 57% This is also illustrated in Figure 9B. The quat by itself substantially reduces dry combing load. Both the HMWS and LMWS also improve the dry combing perfor- mance. Interestingly, the reduction in %ACL change for the LMWS, in the presence or absence of the quat, is by and large lower than that of the quat used by itself. However, the reduction caused by the HMWS, either in the absence or presence of the quat, is higher than that of the quat by itself. 1oo q - • o • 60 2 0 250 500 750 1000 1250 1500 1750 Amount Silicon Deposited (•tg Si/g hair) lOO 80- 60 -( 40- I 0 100 200 o B I I I I 300 400 500 600 700 Amount Silicon Deposited (p-g Si/g hair) 100 40- 20- Amount Silicon Deposited (•g Si/g hair) Figure 7. Dry ( 0 ) and wet (O) combing performance of fluid 1 (A), fluid 2 (B), and fluid 3 (C) in presence of the quat. The values shown at x-axis = 0 are the dry (•) and wet (O) combing benefits of the quat in the absence of any silicones. 0 i i i ! 0 100 200 300 400 500 600