Wax microspheres

For instance, when the chemical stability of a suspension of ibuprofen powder and other ibuprofen-wax microspheres was studied with a modified HPLC procedure for three months, the amount of drug released from the microspheres was affected by the medium pH, type of suspending agent, and storage temperature without observing chemical degradation of the drug [49]. 

Adeyeye, C. M., and Price, J. C. (1997), Chemical dissolution stability and microscopic evaluation of suspensions of ibuprofen and sustained release ibuprofen-wax microspheres, /. Microencapsul., 14(3), 357-377. 

Giannola, L.I. De Caro, V. Severino, A. Camauba wax microspheres loaded with valproic acid preparation and evaluation of drug release. Drug Dev. Ind. Pharm. 1995, 21 (13), 1563-1572. 

Adeyeye, C.M. Price, J.C. Development and evaluation of sustained-release ibuprofen-wax microspheres. II. In vitro dissolution studies. Pharm. Res. 1994, 11, 575-579. 

Bodmeier, R., Chen, H. and Bhagwatwar, H., Polymer and wax microspheres prepared by emulsification techniques, Bull. Tech. Gattefosse, 1990, 83. 

Microspersion 230] Microspersion 235] Microspersion 250-50] Microspersion 6550. See Polyethylene wax Microsphere M-100. See Polymethyl methacrylate... 

White wax is also used as a film coating in sustained-release tablets. White beeswax microspheres may be used in oral dosage forms to retard the absorption of an active ingredient from the stomach, allowing the majority of absorption to occur in the intestinal tract. Wax coatings can also be used to affect the release of drug from ion-exchange resin beads. 

These data are corroborated by results obtained from continuous photolysis experiments. Cabowax-20M protected Pt catalyst when coupled to Ru02 fails to split water under illumination of a cyclic system containing Ru(bipy)3+ as a sensitizer and methylvio-logen as an electron relay. By contrast, if the Pt microspheres are protected by PVP-Ci6 simultaneous H2 and 02 productions are observed. The lack of specificity of the Carbo-wax 20 M protected particles is attributed to the strongly hydrophylic nature of this protective polymer providing facile access of the Ru(bipy)3+ cation to the platinum surface. Uncharged hydrophylic polymers appear thus unsuitable for Pt protection in this cyclic water decomposition system. 

Ski boots use a wide variety of plastics adapted for low temperatures. Thermoplastic polyurethane/ABS blends and plyamides are used for the outer shell of ski boots and modified polyethylene terephthalate for the binding. Polyurethane (PU) foam is often used to line the boots. Microsphere fillers may be incorporated into foam-lined boots to add further thermal insulation to the wax binder. The antivibrational characteristics of PU foams have also led to their use in ski fittings. A sandwich construction of polyurethane elastomer and aluminum alloy has been fitted between the ski and the binding to reduce shock and vibration. 

In 2010, Wang s and Fang s teams in China independently showed that PCM with enhanced thermal conductivity and phase-change performance can be successfully fabricated by sol-gel microencapsulation of wax such as n-octadecane and paraffin in silica microspheres obtained from TEOS polycondensation. The thermal conductivity of the microencapsulated n-octadecane is also significantly enhanced due to the presence of the high thermally conductive silica shell. However, the silica microcapsules prepared from TEOS only have poor mechanical properties, with the brittle shell of the microencapsulated PCM easily cracking. 

Additives used in final products Plasticizers/flexibilizers epoxidized oils, low molecular polyamides, polysulfidesdibutyl phthalate, condensation products of adipic acid and glycols, isodecyl pelargonate, cyclohexyl pyr-rolidone Other diluents (glycide ether), modifiers, rheological additives, flame retardants Antistatics alkyl dipolyoxyethylene ethyl ammonium ethyl sulfate, carbon black, carbon monofiber, graphite, quaternary ammonium compound, silver-coated basalt, tin oxide Release calcium carbonate, carnauba wax, ceramic microspheres, ethylene bis stearoformamide, montan wax, silicone oil Slip carbon fiber, PTFE, sorbitan tristearate ... 

Additives used in finai products Fillers aluminum nitride, barium titanate, aluminum nitride, antimony trioxide, aramide fiber, attapulgite, carbon fiber, carbon nanofiber, carbon nanotubes, clay, glass fiber, graphite, molybdenum sulfide, montmorillonite, PTFE, silica, smectite, titanium oxide whisker Plasticizers diethylene glycol dibenzoate, dimethyl phthalate, triallyl phthalate, diethynyldi-phenyl methane, phenylethynyidiphenyl methane, 4-hydroxy-benzophenone Antistatics antimony-containing tin oxide, carbon black, carbon, nanotubes, indium oxide microspheres, polythiophene Release polyethylen wax, PTFE, silicone oil, zirconium chelate ... 

VAcA C microspheres Na, Li, Mg silicate (laponite) silica microcrystalline wax 19,600 50,000 surface coating two-piece packaging static-dissipating adhesive tape packaging for electronic devices semiconductor devices... 

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