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A solvent-free, photostabilizing silicone fluid.
May 14, 2008
By: TOM BRANNA
Editor
HallStar SolaSil PSF-SF (INCI: Undecylcrylene dimethicone) is an organo-modified silicone polymer made by grafting a cyano diphenyl acrylate moiety onto a polysiloxane backbone. This solvent-free, somewhat viscous, fluid enhances the photostability of avobenzone by quenching the triplet excited state, and improves the feel and spreadability of sunscreen formulations. It provides formulations with superior organic compatibility, anti-whitening and detackification benefits, as well as enhanced substantivity and water-resistance, according to HallStar. The recommended use level is 2-8%. Also during Suppliers’ Day, HallStar promoted Polycrylene (INCI: Polyester-8). This photostabilizer is a low molecular weight copolymer of adipic acid and neopentyl glycol that is terminated with cyanodiphenyl propenoic acid, which absorbs UV radiation with a peak at 303nm. On a weight-to-weight basis, three grams of Polycrylene absorbs about as much UV radiation as one grame of octocrylene. Therefore, at recommended use levels of 1-3%, its minimal UVB absorbance will not affect SPF. It should be used in sun protection formulas that contain avobenzone to improve the UVA protection factor. More info: www.hallstar.com
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