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(organic chemistry)
[OC6H4C(CH3)2C6H4OCO]x A linear polymer of carbonic acid which is a thermoplastic synthetic resin made from bisphenol and phosgene; used in emulsion coatings with glass fiber reinforcement.



a polyester of carbonic acid and dihydroxy compounds of the following general formula:

Polycarbonates may be aliphatic, mixed, or aromatic, depending on the nature of A and A′. Only aromatic polycarbonates have gained practical importance; they are produced commercially by interphase polycondensation, phosgenation of aromatic dihydroxy compounds in a pyridine medium, or transesterification of diaryl carbonates (for example, diphenylcarbonate) by aromatic dihydroxy compounds. The most commonly used dihydroxy compound is 4,4′ -isopropylidenediphenyl, also called dian or bisphenol A. Polycarbonates based on the bisphenol A have the formula

These polycarbonates are thermoplastic linear polymers (molecular weight, 35,000–70,000) that are characterized by very high impact strength (250–500 kilojoules per sq m, or kilograms-force per cm per sq cm [kgf.cm/cm2]), yield strength (strength in flexure, 77–120 meganewtons per sq m [MN/m2], or 770–1,200 kgf/cm2), and very good dielectric properties (dissipation factor, 0.0009 at 50 hertz). Polycarbonates are optically transparent, cold-resistant (stable at temperatures slightly below – 100°C), and self-extinguishing; they dissolve in most organic solvents such as methylene chloride and chloroform, and are resistant to acids, salt solutions, and oxidizing agents.

Polycarbonates are processed by all the standard methods used for thermoplastic resins (for example, injection molding, extrusion, and compression molding). They are used in the preparation of films, fibers, and various products in many sectors of industry, mainly in electric engineering. In 1973, world production of polycarbonates (mainly in the Federal Republic of Germany, the USA, and Japan) was 100,000 tons.


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A category of plastic materials used to make myriad products, including CDs and DVDs.
References in periodicals archive ?
Combining long-term clarity with durability, Makrolon PC sheet provides a clear, unobstructed view in flat or curved applications.
One of the main advantages of the Makrolon UV AdLight polycarbonate sheets is that they harmoniously combine light transmission and light diffusion.
Like all Makrolon products the new multi UV 3/16-20 series is impact-resistant and stands out for being application-friendly.
A number of medical device manufacturers rely on Makrolon Rx2530 polycarbonate resin.
The Bayer researchers set to work on Makrolon polycarbonate and succeeded in modifying it for the special requirements of manufacturing processes in the music industry.
Working with ACI Medical in San Marcos, CA, a medical device design and molding company, Terumo selected Makrolon Rx2530 polycarbonate resin, by Bayer Material Science, Pittsburgh, PA, as the material to be used for the EC junction.
firm produces Makrolon, a polycarbonate sheet that combines toughness and flexibility, according to D.
Also available are posts with a Test Station Terminal Enclosure constructed of makrolon polycarbonate, with stainless steel hardware and 11 accessible terminals.
Sheffield's new generation of laminates, featuring Makrolon AR hard-coat technology, assures long-lasting surface clarity and resistance to yellowing.
The monitor bezel, with an integrated Makrolon window, has a 14.
Danny Rolph, also exhibiting at Chapter Arts Centre in Cardiff, uses oil and acrylic on various surfaces, including Makrolon plastic (think greenhouse roofing