Conditioning By Cationic Polymers On Asian Hair-4

Silicone deposition on undamaged Asian hair
After silicone has deposited on the hair surface, the droplets collapse, spread and form a uniform and thin coating on hair fibre. To illustrate the results from the coacervation study, the silicone deposition on undamaged Asian hair was focused on RSSL results from the hair surface. As shown in Figure 2, the sample with polyAPTAC-ACM/GHPTC mixture deposit more SPS silicone emulsion than the other two polymers, and the same was observed for LPS/SPS and ADM silicone emulsion. For the LPS silicone emulsion, the shampoo without polymer showed the highest silicone deposition on undamaged Asian hair due to the high affinity between LPS and the hydrophobic surface of the hair. Too much silicone deposited on hair could be a disadvantage and result in an oily feeling on dry hair. The commercial shampoo containing GHPTC and silicone showed an RSSL of 0.4, which is in the middle range of deposition. The silicone build-up level was evaluated after five washings as shown in Figure 3. The SPS, ADM and commercial shampoos did not exhibit build-up, and the RSSL remained the same for all polymers. However, LPS and LPS/SPS samples exhibited a serious build-up in shampoos with no polymers or containing PQ-10, while the GHPTC and polyAPTAC-ACM/GHPTC mixture was observed with no significant silicone build-up. The results indicate that samples containing those two polymers have a desirable property for suppressing LPS build-up in conditioning shampoos. The preferred RSSL should be 0.5 to 1.0. The high level of silicone deposition by the polyAPTACACM/ GHPTC mixture could be adjusted by decreasing the silicone content. The silicone deposition results correlated well with the results from the coacervation study.