Article: Polyphosphonate: new flame-retardant cousin of polycarbonate.(close up: materials)

A new thermoplastic made by a polycondensation process similar to that used for polycarbonate offers high clarity, inherent flame resistance, and broad potential for copolymerization with PC and alloying with styrenics and polyesters. FRX Polymers Inc., a two-year-old unit of Triton Systems Inc. in Chelmsford, Mass., developed technology to produce a phosphorus-based monomer and polymerize it into what will be the first commercial polyphosphonate (PPh) resins. FRX is qualifying PPh homopolymers and copolymers for melt blending as polymeric flame-retardant additives in engineering resins and for use as inherently flame-retardant transparent plastics in consumer electronics ...

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