EFFECTS OF SILICONE PRETREATMENT ON OXIDATIVE HAIR DAMAGE

A high-viscosity, high-amine-content silicone fluid has been found to provide significant conditioning properties. Application of this mater ial as a pretreatment provides protection against the damage caused by bleaching and oxidative dyeing as observed by scanning electron micro scopy (SEM) and combing force studies. This produce does not interfere with the bleaching or oxidative dyeing processes when used as a pretr eatment as shown by half head studies and thin-section light microscop y. Treatment of hair with the microemulsion also reduces color fading of temporary dyes through shampooing as shown by chromaticity tristimu lus evaluations and thin-section light microscopy. In deposition exper iments, several silicones were found to penetrate through the cuticle and into the cortex of the hair fiber. This was demonstrated by scanni ng time-of-flight secondary ion mass spectroscopy (TOF-SIMS).