Poly[phosphonate-co-carbonate]

Catalog NumberACM77226905

CAS Number77226-90-5

CategoryPhosphate Ester Flame Retardant

Molecular Formula	(C15H16O2.C13H13O3P.C13H10O3)x
Application	Flame Retardant

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Case Study

Poly(Phosphonate-co-Carbonate) Provides Flame Retardancy to Glass Fiber Reinforced Polycarbonate

Lens, Jan-Pleun, et al. Reinforced Plastics, 2019, 63(1), 36-39.

Polyphosphonates form transparent blends with polycarbonate (PC) which achieve the highest flammability rating at 0.1 mm thickness during UL protocol testing (UL VTM0 or V0). The materials demonstrate excellent heat release test results required for railway and aviation industry standards. For non-transparent applications, polyphosphonates have been evaluated in glass fiber (GF) reinforced PC. GF PC stands out as an excellent engineering plastic that delivers superior electrical insulation and impact protection which enables its growing application in electronic housings and covers along with brackets and structural components for computers and more. Flame retardancy UL 94 V-0 rating is a necessary specification for many of these applications.
Commercial non-halogenated flame retardant 40-50 wt% GF PCs that contain high GF loading meet the UL 94 V-0 rating only when their thickness is minimal but this comes with reduced heat deflection temperatures (HDTs), yet the target is to obtain V0 ratings on materials with thicknesses of 0.8 mm or less and HDTs of at least 110 °C. These highly filled GF PCs demonstrate insufficient flow rates which restrict their effectiveness in injection molding operations particularly for thin wall structures.
Polyphosphonate and poly(phosphonate-co-carbonate) give GF PC excellent flame resistance with a V0 rating at just 0.8 mm thickness while keeping high flow characteristics together with superior heat deflection temperature and strong mechanical properties.

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