Lexan® polycarbonate

General Electric Company (U.S.A.), Lexan Polycarbonate—Design... 

Diphenylcarbonate (DPC) is a key monomer for producing LEXAN polycarbonate resin by melt polymerization reaction of DPC with Bisphenol A. Currently, DPC is produced by General Electric Company (GE) in Cartagena, Spain, using a two-step process (Eq. 1) The stoichiometric carbonylation of... 

F155NR. FI85NR. unmodified epoxies FI55, F185. rubber-modified epoxies Lexan, polycarbonate. 

Figure 8. Permeability of Lexan polycarbonate to carbon dioxide at 35 °C as a function of C02 partial pressure.Qo, in the presence of 117 mm. Hg of isopentane in the feed , pure C02 Q...

And so we arrive at the basis for the strength of many polymers, especially plastics—molecular entanglement Picture hitting a glass windowpane with a hammer. The same blow to an equivalently shaped piece of Lexan (polycarbonate) or Ludte poly[methyl methacrylate]), both transparent plastics, does not break the polymer. In fact, the plastic glass is somewhat resilient, causing the hammer to bounce off of it. 

Polycarbonates and Polyurethanes The chemistry of carbonic acid derivatives is particularly important because two large classes of polymers are bonded by linkages containing these functional groups the polycarbonates and the polyurethanes. Polycarbonates are polymers bonded by the carbonate ester linkage, and polyurethanes are polymers bonded by the carbamate ester linkage. Lexan polycarbonate is a strong, clear polymer used in bulletproof windows and crash helmets. The diol used to make Lexan is a phenol called bisphenol A, a common intermediate in polyester and polyurethane synthesis. 

Using the cathetometer the force at initiation was measured on notched bars of % inch thick extruded Lexan polycarbonate sheet over the widest temperature range possible at one rate of deformation. These initiation forces and the forces at failure are shown in Figure 7a. Brittle failure parallels craze initiation in its temperature dependence. Yield force has a greater temperature dependence—one that approximately parallels the measured values of yield stress in linear tensile tests (data... 

Op ue Lexan Polycarbonate Sheet-Note For general info on "Lexart see Section IV-C on transparent a twor,... 

General Electric Co., the manufacturers of Lexan polycarbonate sheet, have developed a three point transparent armor system around this material. The products are complimented by a well designed body of information that will provide the customer with all needed instructions for cutting, finishing and installing the various Lexan and Lexgard products. To obtain this product material contact ... 

D1SHP40L [GE Silicones] Primo used as adhesion promoter for weatherable abrasion-resistant silicone hardcoat on Lexan polycarbonate. 

Figure 5. Absorbance Spectrum of Lexan Polycarbonate Used for Refractive Index Determinations. The polymer was dispersed in a KBr disc at ca 5 wt % ...

This thermoplast is produced by General Electric under the tradename of Lexan. Polycarbonates are classified as engineering thermoplasts because of their high performance in engineering designs. The generalized formula is ... 

Lexan is a clear, transparent, strong, and impact-resistant plastic with literally countless applications. It is used in both protective and everyday eyeglasses as illustrated in Figure 27.10. The Apollo 11 astronauts wore Lexan helmets with Lexan visors on their 1969 trip to the moon. CDs and DVDs are Lexan polycarbonate, as are many cell phones, automobile dashpanels, and headlight and taillight lenses. 

Before the development of tough, resilient polyurethane wheels, street roller skates used steel wheels that stopped dead when they hit the smallest pebble or crack in the pavement. Rollerblades would not exist without polymer technology, both in the wheels and in the strong ABS plastic used for the uppers. The helmet is molded from Lexan polycarbonate. 

Lexan Polycarbonate from bisphenol A and phosgene General Electric, U.S. 

Lexan Polycarbonate is used as a glazing material in bulidings and i vehicles. 

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