Technology to protect against deposited contamination from leave-on cosmetics has been released and launched on the market. However, depositing enough ingredients from rinse-off products such as shampoos to protect the hair surface is a challenge due to the high surfactant content and rinsing process. Air pollution contains toxic gases (ozone, NO, SO, etc.), liquid droplets (tar, cooking/fuel fumes) and solid particles (PM2.5/10, heavy metals, etc.). Air pollution protection includes not only protection of hair from chemical damage (anti-pollution), but also the physical adhesion of pollutants (anti-dust). 8
In the current study, acrylamidopropyl ammonium trichloride/acrylamide copolymer (APTAC/ACM) has been evaluated in silicone-free and silicone-containing shampoos to protect hair from chemical damage, i.e. Physical effects of protein degradation and dust adhesion. A new conditioning polymer deposition mechanism is introduced. Experiments show that the APTAC/ACM copolymer deposited on the hair surface will form a transparent, elastic and hydrophobic composite layer with anionic surfactants during shampooing. This hydrophobic complex prevents dust deposits and effectively protects hair from damage.
