Testing Polysilicone-19 for Hair Conditioning and UV Protection Claims

October 21, 2008 | Contact Author | By: Sascha Herrwerth, Holger I. Leidreiter, Uta Kortemeier, Christian Hartung, Burghard Grüning and Sahar Fakhry-Smith
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Keywords: UV protection | color protection | hair dye protection | cationic siloxane copolymer | conditioning

Abstract: Polysilicone-19, a new cationic siloxane copolymer for rinse-off shampoos and conditioners, is shown here to protect dyed hair against UV fading and damage and to provide a conditioning effect.

Modern hair treatments have to fulfill technical requirements and high emotional demands. While data on hair combing, tensile strength or fatigue testing are common to support technical claims, the market success of a product is essentially determined by fulfilling those emotional characteristics that are claimed in the advertisement.

In hair care, these emotional aspects are determined mainly by feel and appearance. Both of these parameters are difficult to assay directly by objective methods; they must be scored by sensory assessment and can be supported by a combination of various technical investigations.

In this study, the appearance of hair tresses was evaluated by color measurements, fiber tensile strength and keratin degradation parameters. The type of damage selected for testing purposes was irradiation by ultraviolet/visible (UV/VIS) light, simulating the sun.