Eyeglass coatings

Decorative. Titanium nitride has a golden color and is used extensively to coat steel and cemented carbide substrates for watch cases, watch bands, eyeglass frames, etc. It provides exceUent scratch resistance as weU as the desired aesthetic appearance, and it replaces gold coatings used previously. 

Sputter coating of watches, frames for eyeglass and similar items with titanium nitride. 

Coatings of refractory carbides and nitrides and more recently carbon and DLC are used extensively in decorative applications on jewelry, eyeglasses, and similar products in attractive colors such as gold (TiN) and metallic grey, or charcoal (DLC, CrN, and TaN). They provide a surface which is hard and wear resistant, sweat resistant and, in the case of gold, less costly. They are usually applied by cathode sputtering and less frequently by CVD. 

At temperatures around 600°C and extremely low pressures, methane will decompose and deposit a thin film of carbon, in the form of diamond, on a surface. The process, known as chemical vapour deposition, or CVD, can be used to coat a wide variety of surfaces. The hardness of this diamond film can be used for applications that require non-scratch surfaces such as cookware, eyeglasses, and razor blades. 

While other organic esters are commercially available, namely cellulose butyrate and cellulose propionate, by far the most widely used is cellulose acetate, which is available as plastics, in films, sheets, fibers, and lacquers. Cellulose acetate is used in the manufacture of display packaging and as extruded film for decorative signs, and to coat a variety of fibers. Injected molded products include toothbrush handles, combs, and brushes. It is also used in lacquers and protective coatings for metal, glass, and paper. Cellulose acetate films are used in reverse osmosis to purify blood, fruit juices, and brackish water. Some eyeglass frames are... 

Imagine the possibilities, some of which are just now becoming reality Tools, knife blades, and scalpels coated with diamond remain forever sharp. Eyeglass lenses and wristwatches coated with diamond remain scratch-free. High-fidelity loudspeakers coated with diamond give a nearly perfect, undistorted sound at high frequencies. Hip joints and other biological implants coated with diamond are not rejected by the body s immune system. 

In Chapter 9 properties of antireflection coatings were examined. At that time the simplified case of a single film separating air and a substrate was considered. Here the discussion is on how such a film might be produced. Acmal films, such as the anti-reflective coatings on the lenses found in eyeglasses, contain multiple layers plus a protective coating. 

Coatings is a diversified application area involving a substrate and some type of surface covering. The type of substrate material to be coated can be plastics such as polycarbonate or polypropylene, metals, silicone rubber, ceramic- or refractory-like materials, fabrics like nylon and rayon, photographic films, paper materials, walls (painted or not), eyeglass lenses,... 

Chem. Descrip. Proprietary benzophenone Uses UV absorber for unsat. polyesters, fiberglass corrugated outdoor panels, PVC film for outdoor use, extruded garden hose, acrylic and epoxy coatings, cellulosic eyeglass frames Properties Wh. to yel. cryst. powd. very sol. in alcohols, ketones, esters mod. sol. in aromatic hydrocarbons low sol. in aliphatic hydrocarbons m.w. 214 sp.gr. 1.33 m.p. 117 C PETA-K [UCB Chems.]... 

Cellulose nitrate (CN) or nitrocellulose is a nitric acid ester of cellulose manufactured by the action of a mixture of sulfuric acid and nitric acid on cellulose, such as purified cotton linters. The major use of plastics-grade cellulose nitrate is in the coating field. Despite its disadvantages of flammability, instability, and poor weathering properties, cellulose nitrate is one of the cheapest and most highly impact-resistant plastic. It still has many uses because of these properties, including fountain pens, tool and brush handles, eyeglass frames, and some motion picture film. It accounts for only a small fraction of the volume of cellulose plastics. Cellulose nitrate materials are sometimes simply called nitrates. 

These coatings for eyeglasses contain nanoparticles that diffuse glare and repel the polar attraction of water molecules. 

Examples include textiles that are resistant to stains and odor, bacteria-killing bandages, cosmetics, coatings for eyeglasses, LEDs, self-cleaning glass, and Blue-Ray discs. 

Lab personnel working with UVL should always wear protective garments such as lab coats and gloves to minimize direct skin contact. In that normal eyeglasses or contact lenses offer only limited protection, the best protection is a full-face shield. Signs warning of the effects of UVL should be posted at workstations where it is used. 

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