In cosmetic textiles, the major interest in microencapsulating is currently in the application of vitamins, essential oils, skin moisturizing agents, skin cooling agents, anti-aging agents etc.
Focusing on the field of cosmetic textiles, the techniques of producing microcapsules containing essential oils and cosmetic substances have been studied extensively in the past.
Yamato et al. prepared microcapsules comprising of active substances acting to improve the physiological conditions of human skin. The microcapsule would not break during production, but was gradually released when the textile structure was subjected to light pressure created by movement of the human body (US Patent, 1993).
The possibilities of using B - cyclodextrin as wall material have been investigated by a number of researchers (Hak et al. 2000; Wang et al, 2003).
Hak et al. investigated the flexibility of B-cyciodextrin as a protective wall. B-cyclodextrin was embedded onto cellulose fibers by using N-methylolacrylamide. Benzoic acid and vanillin, which acted as an anti-bacterial agent and an aroma respectively, were encapsulated. It was claimed that the anti-bacterial activity was retained after 10 laundering cycles (Hak et al., 2000).
Wang and Chen developed aroma therapeutic textiles by using fragrance with B-cyclodextrin inclusion compounds and fixing them onto cotton fabrics with low temperature by using a conventional pad-thermo fixed method. The fragrance release rates were greatly decreased and the results of sensorial evaluations showed that the performance of the fabric lasted for over 30 days (Wang et al., 2005).
Nelson et al. introduced the use of waste yeast cells in the microencapsulation process. After encapsulating the core material, the yeast cells were attached to both cotton and wool fibres by using cross linking agents and binders. The processes of filling the yeast cells were very simple and the use of yeast cells as wall material generally provided several advantages, such as high loading, inthermoplastic, protection from light, oxygen and hazardous environments, and cost effectiveness (Bishop et aI., 1998).
Copete Vidal et al. invented chitosan based microcapsules containing various active components and investigated their durability with a mixture of microcapsules and a binding agent.
With a finishing that used microcapsules and a binder, the active ingredients were released and found to wash out less quickly, and a high degree of hydration was also achieved (US Patent, 2005).