A useful encapsulation methodology has been developed to fabricate α-tocopheryl acetate-zeolite Y microcapsules. These new microcapsules have been applied to obtain special textile polyamide fibers. The presence of α-tocopheryl acetate in both microcapsules and special fibers has been qualitatively and quantitatively determined using various techniques such as thermogravimetric analysis (TGA), infrared spectroscopy (FTIR), and high performance liquid chromatography (HPLC). Two different techniques to extract the α-tocopheryl acetate encapsulated in both microcapsules and special fibers have been compared: liquid−liquid extraction, that gives the best results under the studied conditions, and supercritical CO2 extraction, which is useful when there are mass transfer limitations as in the case of the special fibers. Mechanical properties of the fiber do not significantly change when they are fabricated with zeolite Y microcapsules. Finally, fabrics knitted with yarns of α-tocopheryl acetate-zeolite Y microcapsules state a significant presence of the additive after 100 washing machine cycles (30 °C, neutral soap).

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14In clay polymer nanocomposite technology, nowadays there is concern about the 15 safety and environmental effects of the nanometric materials. In this work, sheets of layered

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Currently in the marketplace, we can find clothing items able to release skin-friendly ingredients while wearing them. These innovative products with high-added value are based on microencapsulation technology. In this work, due to its lightness, flexibility, porosity, chemical affinity and adsorption capacity, metal− organic framework (MOF) MIL-53(Al) was the selected microcapsule to be synthesized at a large scale and subsequent caffeine encapsulation. The synthesis conditions (molar ratio of reactants, solvents used, reaction time, temperature, pressure reached in the reactor and activation treatment to enhance the encapsulation capacity) were optimized by screening various scaling-up reactor volumes (from lab-scale of 40 mL to pilot plant production of 3.75 L). Two types of Al salts (Al(NO 3 ) 3 •9H 2 O from the original recipe and Al 2 (SO 4 ) 3 as commercial SUFAL 8.2) were employed. The liporeductor cosmetic caffeine was selected as the active molecule for encapsulation. Caffeine (38 wt %) was incorporated in CAF@ MIL-53(Al) microcapsules, as analyzed by TGA and corroborated by GC/MS and UV−vis after additive extraction. CAF@MIL-53(Al) microcapsules showed a controlled release of caffeine during 6 days at 25 °C (up to 22% of the initial caffeine). These capsules were incorporated through an industrial spinning process (with temperatures up to 260 °C) to manufacture PA-6 fibers with cosmetic properties. Up to 0.7 wt % of capsules were successfully incorporated into the fibers hosting 1700 ppm of caffeine. Fabrics were submitted to scouring, staining, and washing processes, detecting the presence of caffeine in the cosmetic fiber.

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