polycarbonates

polycarbonates,

group of clear, thermoplastic polymerspolymer
, chemical compound with high molecular weight consisting of a number of structural units linked together by covalent bonds (see chemical bond). The simple molecules that may become structural units are themselves called monomers; two monomers combine to form a dimer,
..... Click the link for more information. used mainly as molding compounds (see plasticplastic,
any organic material with the ability to flow into a desired shape when heat and pressure are applied to it and to retain the shape when they are withdrawn. Composition and Types of Plastic
..... Click the link for more information. ). Polycarbonates are prepared by the reaction of an aromatic difunctional phenol with either phosgene or an aromatic or aliphatic carbonate. The commercially important polycarbonates use 2,2-bis (4-hydroxyphenol)-propane (bisphenol A) and diphenyl carbonate. This polymer is a clear plastic with a slight yellow discoloration. It has excellent electrical properties and a high impact strength.

References in periodicals archive ?

Michelle Jou, Global Head of Covestros Polycarbonates segment, said, There is a rapidly growing demand for polycarbonate resins and blends, in particular in China.

Germany : Further increase of polycarbonate production

USPRwire, Tue Apr 07 2015] North America Polycarbonate Market by Applications (Automotive, Consumer, Electrical & Electronic, Medical, Optical Media, Packaging & Sheet & Film) & Geography - Trends & Forecasts to 2019

New Study: North America Polycarbonate Market - Trends & Forecasts to 2019

In consumer goods markets, there are countless applications for clear plastics such as copolyesters, acrylic, SAN, amorphous nylon, and polycarbonate.

Dishwasher safe: new clear copolyester is tougher, more heat-resistant, and processes easier, too

Bisphenol A, a building block of polycarbonate plastics, can mimic the effects of the body's natural estrogens (SN: 7/3/93, p.

Lacing food with an estrogen mimic

Various concentrations of glass-fiber reinforcements have also been added to polycarbonates.

Polycarbonate research focuses on flow, alloys, and recycling

On the demand side, exporters and strategic planners focusing on polycarbonates, alkyd resins, and other polyesters in primary forms in France face a number of questions.

Research and Markets: The 2009 Import and Export Market for Polycarbonates, Alkyd Resins, and Other Polyesters in Primary Forms in France Out Today

During the inauguration celebration, Michelle Jou, Head of the Polycarbonates segment at Covestro, said: In Asia and especially China, the demand for polycarbonates and solutions based on it is growing in important industries like electronics, healthcare and automotive.

Germany : Global number one in polycarbonate resins

Three new or improved polycarbonate resins for optical discs were introduced by GE Plastics, Pittsfield, Mass.

New materials rise to the DVD challenge

His team recently gained one such insight while examining the molecular structure of polycarbonate, a material serendipitously discovered in the 1950s and long ranked as the toughest polymer, Yee says.

Designing polymers for structural jobs

Because polycarbonates are widely traded, the ITP Indicator is also a unique gauge of global demand growth because, as demand increases or decreases, it is generally reflected in an increase or decrease in global trade.

Research and Markets: The Polycarbonates World Trade Review of 2008 is Now Available

As part of the worldwide consolidation of its business with sheets made of the high-performance plastic polycarbonate, Bayer MaterialScience has decided to close its site in Darmstadt, Germany.

Germany : Bayer MaterialScience consolidating polycarbonate business

They are also useful as processing and mold-release lubricants for such polymers as ABS, polyesters, polycarbonates, nylons, polybutylenes and PE.