Lexan electrical

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

Today about 75% of the market is held by General Electric and Bayer with their products Lexan and Makrolon respectively. Other manufacturers are ANIC (Italy), Taijin Chemical Co., Mitsubishi Edogawa and Idemitsu Kasei in Japan and, since 1985, Dow (USA) and Policarbonatos do Brasil (Brazil). Whilst this market is dominated by bis-phenol A polycarbonates, recent important developments include alloys with other thermoplastics, polyester carbonates and silicone-polycarbonate block copolymers. 

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... 

Lexan is a registered trademark of the General Electric Company. 

General Electric markets the polycarbonate of bisphenol A as Lexan.W Similar bisphenol A polycarbonate sheets are marketed by Rohm and Haas as the product TuffakJ2]... 

Uses The electrical and electronics industries are the largest users. It is used also in blender housings, kitchen utensils and babies milk bottles. The physical properties are improved by stretching to form crystalline polymers like "Lexan". 

Much the most important polycarbonate in commercial terms is made from 2,2-di(4-hydroxyphenyl)propane, commonly known as bisphenol A. This polymer was discovered and developed by Farbenfabriken Bayer [92], The synthesis and properties of this and many other polycarbonates were described by Schnell in 1956 [93], The polymer became available in Germany in 1959, and was given the trade name Makrolon by Bayer (in the USA, Merlon from Mobay). General Electric (GE) independently developed a melt polymerisation route based on transesterification of a bisphenol with DPC [94], Their product, Lexan, entered the US market in 1960. The solution polymerisation route using phosgene has since been displaced by an interfacial polymerisation. 

The Onsager theory of geminate recombination was qualitatively consistent for aryl-substituted thiapyrylium salt and dialkylamino-substituted triphenyl-methane dispersed in polycarbonate film [301]. The quantum yield of Hie photogeneration was equal to 0.5 at the electric field strength of 106 V cm-1, mobility of I0 12m2 V-1 s-1. Hole and electron conductivity was established. In a triphenylamine-lexan system doped with a boron diketone acceptor, the... 

Sinclair-Koppers Co. Lexan 125 bisphenol A polycarbonate from General Electric Co. Polysulfone aromatic poly(sulfone-ether) from Union Carbide Corp. and PPO poly(2,6-dimethyl-p-phenylene oxide) from General Electric Co. 

Materials. Polycarbonate of Bisphenol-A(PC) was a commercial product (Lexan, General Electric Co., U.S.A.), with a viscosimetric average molecular weight Mv = 40,000. High molecular-weight atactic polystyrene (Mv == 280,000) was obtained from Schuchardt, Miinchen. 

A standard sample of General Electric s Lexan was characterized using the RSA II. Frequencies tested were 0.1, 0.5, 1.0,... 

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 ... 

GE Plastics, a subsidiary of General Electric (GE), has developed a technology that by 2006 could make it unnecessary for carmakers to paint vehicles. It costs around 300 million to build paint lines and they take up about half of a car plant s floor space. GE s Lexan SLX product promises to eliminate the expense and the space requirements. 

Materials. The blsphenol-A polycarbonate used in this In-vestlgationj vas Lexan lU as received from General Electric Co. 

Transmission photocathodes for EUV and soft X-ray applications can be deposited on very thin substrates such as parylene, polypropylene, lexan, aluminum, or even fine mesh grids. This photocathode assembly is normally used in a proximity-focussed configuration mounted close to the MCP input (300 /rm — 1000 /im). Electrons emitted from the photocathode are then accelerated to the MCP by a high electric field (500 — 1000 V/mm). One of the limitations of this configuration, however, is that the photoelectrons spread laterally in the photocathode/MCP gap, resulting in a practical limitation of —50 fim FWHM for the position resolution (33, 46). In general, transmission photocathodes also show lower quantum yields (electrons/incident photon) than opaque photocathode configurations. 

Numerous solvent intensive procedures are facilitated by the installation of direct liquid transfer feedthroughs. The assembly illustrated in Figure 5 may be easily installed into either aluminum or Lexan glovebox panels using only an electric hand drill.(9) The primary components consist of a Swagelock(3) 1/8" OD tube to bulkhead male connector and a Whitey(lO) 3-way Ball valve, and all liquid connections employ 1/8" OD Teflon (5) or stainless steel tubing. 

Biomaterial-induced microemboli were obtained as follows Vk-in. sheets of Plexiglass G (DuPont), polystyrene (Dow Resin F70502.00), or polycarbonate (Lexan, General Electric Co.) were cut, drilled, and mounted into the parallel-disc configuration shown in Figure 2. The surfaces were soaked in ethanol (95% for the polycarbonate and polystyrene and 50% for the Plexiglass) for at least 24 h, and then in saline solution for 12-18 h at 37°C just prior to exposure to the blood samples. 

Lexan is a polymer developed by General Electric, with atomic composition Cii Hi403. 

LEXAN Resin Competitive Data, Brochure CDC 672, General Electric Co., Pittsfield, Mass., p. 8. 

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