Zhou, Yan, et al. International Journal of Cosmetic Science 32.2 (2010): 158-159.
The combination of hydrophobic substitution and cationic properties of polyquaternary ammonium-55 (PQ-55) keeps the polymer solid through its cationic units, provides a hydrophobic barrier for dyed hair and prevents dyes from being washed off during daily shampoo.
The figure to the right shows the results of anti-fading tests on bleached hair at a 2% level in a leave-in treatment for the four polymers. The results show that the PQ-55 (VP/DMAPA/C12-MAPTAC copolymer) leave-in treatment has the best color protection, with a 38% higher color improvement than the control at the end of 10 washes, and as shown in the figure, the effect is visible to the naked eye. VP/DMAPA acrylate copolymer, which has a similar structure to PQ-55 but lacks a hydrophobic chain and a quaternary group, does not provide as good color protection as PQ-55, with a color protection of 17%. In addition, polyquaternium-28 (VP/MAPTAC), a seasonal analog of VP/DMAPA acrylate copolymer, does not have a hydrophobic chain and does not provide much protection for hair. Therefore, the discoloration test results of the three polymers proved the synergistic effect of hydrophobicity and quaternary amine groups on PQ-55.
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