Microcapsule-containing coating

Mishima K, Matsuyama K, Furukawa A, Fuji T, Shida J, Nojiri N, Kubo H, Katada N. Control of polymer coating thickness of microcapsules containing inorganic microparticles using cosolvency of supercritical carbon dioxide. Ka-gaku Kogaku Ronbunshu 2001 27 700-706. 

Benoit JP, Richad J, Thies C. Preparation of microcapsules containing active substances coated with a polymer. France, WO 9813136, 1998. 

Another coating technique is microencapsulation. It coats liquid droplets or solid particles with a skin and forms microcapsules with dimensions in the range 1-5000 pm. The skin consists of natural or synthetic polymers and may be dense, permeable, or semi-permeable. Therefore, this technology allows the production of microcapsules containing a reactive substance, which can be liberated in a controlled fashion by destruction of the skin or by permeation. It is also possible to carry-out reactions within the capsules after permeation of reaction partners from the outside. 

Suda, H. Microcapsules containing isocyanates, their manufacture, and coating compositions, adhesive compositions, and plastic modifiers containing them. JP 2006061802, 2006. 

FIGURE 33.3 Dynamics of bacterial cell density (log x cfu/mL) at different periods (after 30, 60, 90, and 120 min) after incubation of microcapsules containing bacteria cells in chitosan-coated alginate matrix (AG 1% CH, AG 1.5% CH, and AG 2% CH) in simulated gastric juice (pH 2). The decimal reduction time values (D ) (min) are represented for each variant. 

Besides this, other coating materials have also been used. The whey protein has been used to coat wet alginate microcapsules containing L. plantarum. After 90 min of exposure to simulated gastric juice, an improved survival rate of 6 log x cfu/mL was registered. The suggested rationale for this is that whey protein provides a layer around the microcapsules, which cannot be degraded by... 

Borreguero, A.M. Carmona, M. Sanchez, M.L. Valverde, J.L. Rodriguez, J.F. Improvement of the thermal behavior of gypsum blocks by the incorporation of microcapsules containing PCMs obtained by suspension polymerization with an optimal core/coating mass ratio. Appl Therm Eng 30 (2010) 1164-1169. 

Suryanarayana, C., Rao, K. C., and Kumar, D. Preparation and characterization of microcapsules containing linseed oil and its use in self-healing coatings. Progress in Organic Coatings, 63 (1), 72-78 (2008). 

Microcapsules containing a small amount of additives that will be released by crack propagation or other triggering mechanisms have been incorporated into polymeric coatings [21]. Urea/formaldehyde capsules containing silicone oil are shown in Figure 21.6. 

Interesting smart coatings are based on microcapsules containing a marker dye that can be released when the coating is damaged by cutting, by abrasions, and by... 

Anticorrosion Performance of Microcapsules Containing Composite Coatings... 

---