J. Cosmet. Sci., 59, 105–115 (March/April 2008) 
Influence of cellulose polymers on the semipermanent dyestuff process for yak hair: An analytical investigation

Abstract

The aim of this study was to investigate the effect of some cellulose polymers mixed in a semipermanent dyestuff on the dye uptake of yak hair fiber and color fading after repeated washing cycles. Two different classes of commercial polymers were tested: non-ionic and cationic. Formulations based on a mixture of HC and basic dyes, with different molecular sizes, were employed as representative dyestuffs. UV-Vis spectroscopy and colorimetric measurements were used to analyze the extracted dyes from the yak hair cuticle and cortex. The results obtained indicate that the presence of cationic polymers in the dye bath improves both the quality of the dyeing process and the antifading effect during the first washing cycles.

Effect of cationic charge and hydrophobic index of cellulose‐based polymers on the semipermanent dyestuff process for hair

“…Also, following the dye retention vs washing cycles, when SL‐100 and SL‐60 polymers were used, a fast decrease (rapid change in the slope) occurs between the 5th or 6th washing cycles (data not reported) similar to that observed in our previous work [3] and attributable to the polymers washing out. On the contrary, a progressive decrease during the washing cycles was visible when SL‐30 polymer was used analogously to that obtained with the control (see Fig.…”

“…Moreover, we decided to employ a high ratio between dyestuff and yak hair that involve a much larger colouration for ensuring easier measurements of the dyes by UV–Vis spectroscopy. The preparation of dyeing solution containing HC Blue 2, Basic Red 51 and HC Yellow 2 as well as the dyeing procedure and hair washing was conducted as reported in our previous work [3].…”

“…The dye concentrations of the extracts were calculated using calibration curves obtained for each of the single dyes in a 50% v/v aqueous ethanol solution. A linear relationship according to Beer’s law was found between absorbance and concentration for each dye studied, as previously described [3]. Assuming that there is no interaction between the dyes on the mixtures, the total absorbance could be obtained by the simple addition of the absorbance of the individual component at a given wavelength using the formula [10]: …”

“…In a recent work [3], we have studied the effect on the hair dyeing process of two different classes of cellulose‐based polymers: the quaternary nitrogen‐containing cellulose ether polymers (Polymer JR 30‐M and SoftCat TM Polymer SL‐60) and the non‐ionic polymers (NATROSOL ® CS 250 and the NATROSOL ® PLUS CS) directly incorporated into semipermanent hair dyestuff (containing HC Blue 2, Basic Red 51 and HC Yellow 2 dyes).…”

Thermo‐responsive hydrogels from cellulose‐based polyelectrolytes and catanionic vesicles for biomedical application

“…They can be used to reproduce biomimetic materials, but also for innovative nanotechnology applications . Notable examples of these polymers are cationic hydroxyethylcelluloses, which are inexpensive, highly biocompatible, possess antimicrobial activity, and therefore are widely used in personal care products, such as solutions for contact lenses and hair‐care formulations . They can lead to gels at low concentrations, by addition of small amounts of ionic surfactants .…”