Coating controlled release

Acrylate copolymers -m enteric coatings [CONTROLLED RELEASE TECHNOLOGY - PHARMACEUTICAL] (Vol7)... 

Single-unit versus multiparticulate coated controlled release systems. The... 

Waterman, K. C., and Fergione, M. B. (2003), Press-coating of immediate release powders onto coated controlled release tablets with adhesives, J. Controlled Release, 89, 387-395. 

Verhoeven, J. Schutte, S.C. Perchier, L.J.C. Danhof, M. Junginger, H.E. The design of a dry-coated controlled-release tablet for oxprenolol with microspherous polypropylene powder. J. Control. Release 1989, 10, 205-217. 

Gradual diffusion of an active ingredient through a permeable or soluble coating. Pelleted products such as fertilizers and medicinals are often covered with a layer of a substance that permits slow and uniform escape of the active principle. Sulfur is used to coat controlled-release fertilizers gelatin and similar materials serve the same purpose in pharmaceuticals. 

There are various morphologies of latex particles available these include core-shell and other complex morphologies within the latex particles, and also hollow latex particles. The traditional route to hollow latex particles is the production of core-shell latexes whore the inno core of the latex particles can be removed in a post-polymerization process [8]. These hoUow latex particles have a varied of uses in surface coatings, controlled release tedmologies and as opacifiers. Recently a new approach to the production of hollow latex particles has been developed [9]. In tiiis approach a surfactant structure is stabilized by the polymerization of a vinyl monomer via free radicals in the walls of the vesicles. A vesicle, which is usually a meta-stable structure is converted into a hollow latex particle . This process, while not strictly an emulsion polymerization, has been optimized by use of emulsion polymerization procedures [10]. In the future it is possible that many other unique surfactant structures may be maintained by the in situ introduction of polymer. 

Uses Thickener, stabilizer, suspending agent in pharmaceutical tablet coatings, controlled-release pr s., encapsulation, tablet binding Features Highly surf, active low surf, and interfacial tensions thermoplastic extrudable heat-sealable in films and coatings inert Regulatory DMF listed... 

Uses Surfactant, thickener, stabilizer, suspending agent in pharmaceuticals, tablet coatings, controlled-release prods., encapsulation tablet... 

For example, natural organic materials may be acceptable on the basis of total N, P2O5, and K2O content, provided the source of the material is identified and approved. Synthetic organic materials, if sparingly soluble, may require special methods of analysis, particularly if intended for controUed-relcase fertilizers. Likewise, special tests may be required for coated controlled-release fertilizers. 

Edgar et al. (2001) have focused on the performance of cellulose esters in modern coatings, controlled release of actives, plastics (with particular focus on biodegradable plastics), composites and laminates, optical films, and membranes and related separation media [29]. 

Eckberg, R.P. and Sheperd, D., Radiation curable sihcone coatings controlled release design (pp. 507-513), Orlando, Proc. RadTech America, 1994. 

R. P. Eckberg, B. D. Shepherd Radiation Curable Silicone Coatings Controlled Release Design, RadTech North America, Orlando 1994, p. 507 - 514. 

Javierre E., Garda S.J., Mol J.M.C., Vermolen F.J., Vmk C., van der Zwaag S. (2012), TaUoiing the release of encapsulated corrosion inhibitors from damaged coatings controlled release kinetics by overlapping diffusion fronts . Prog. Org. Coat. 75,20-27. 

Eckberg RP, Sheperd D. Radiation curable silicone coatings controlled release design. In Proceedings of the RadTech America. Orlando 1994 507-513. 

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