Semi-permanent split end mending with a polyelectrolyte complex

Split ends form through mechanical stresses during grooming procedures and are more likely to appear in hair damaged as a result of excessive combing forces. Although there are no conventional systems that will permanently mend split ends, a semi-permanent mending composition has been achieved through a polyelectrolyte complex. The complex is formed as a result of the ionic association of a cationic polymer, Polyquaternium-28, and an anionic polymer, PVM/MA Copolymer. Hair tresses containing tagged split ends are used in measuring mending efficacy. The tagging allows the fate of the split ends to be determined after different types of treatment regimens which test the durability of the mend. Monitoring of the repair and mending durability is carried out with the aid of a stereomicroscope. Results obtained with this method indicate that the complex both by itself and when formulated into a simple lotion provided a high level of split end mending not only after initial treatment but more importantly after combing showing the durability of the mend. Cumulative effects and durability to washing indicate that the polymer complex does not build up on the hair and rinses off with shampoo making possible its usage as a post shampoo treatment. The formulated lotion has higher durability performance as compared to a commercial product with a split end mending claim. The proposed mechanism of action entails a crosslinking microgel structure that infiltrates the damaged hair sites binding them together. This model is supported by the analysis of phase behavior, viscometry, Scanning Electron Microscopy, and absorption of ionic dyes.