In today’s competitive cosmetic market, one of the main challenges is to speed up product development while maintaining a high quality of work and adhering to the constantly changing regulations.
One way to anticipate the results and allow a quicker development time is to take advantage of previous experience and develop a better knowledge of the structure-activity connections. From this perspective, the aim of this study is to investigate the correlations between molecular structure of thickening polymers and their final properties in formulations: thickening effect in different pH situations, resistance to UV exposure, and other benefits such as emulsifying-stabilising capacity of oils, texture and sensory profile.
Materials and methods
To study the influence of the polymer structure, several polymers were synthesised by an inverse emulsion polymerisation technology1 with exactly the same synthesis parameters but with various types of monomers, oils and surfactants. To complete the investigation, these inverse emulsion polymers were compared to the same polymer structure obtained through a precipitation synthesis (see Table 1). The final properties of these polymers were then compared in final formulation situations:
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