Shpp Global Technologies B.v.

Norberto Silvi

Peter Vollenberg

Christopher Ryan Ziegler

Edward Kung

A thermoplastic composition includes: (a) from about 82 wt % to about 92 wt % of a thermoplastic resin including poly(phenylene ether) and polystyrene; and (b) from about 3 wt % to about 13 wt % of a carbon-based filler. The carbon-based filler has a specific surface area of at least 650 square meters per gram (m2/g) and an Oil Absorption Number of at least 250 milliliter per 100 gram (ml/100 g). The composition has a dielectric constant ε' of between 3.5 and 10 and a dissipation loss ε″ of between 0.25 and 5, as measured at a frequency of between about 75 gigahertz (GHz) and about 110 GHz. A ⅛-inch-thick molded sample of the composition exhibits a Percent Absorbed Power measured in Transmission mode of at least 50% when observed according to a Free Space method at frequencies from about 75 GHz to about 110 GHz.

Electrically conductive microwave shielding compositions

Thermoplastic compositions include: (a) a thermoplastic polymer including a polycarbonate component; (b) a poly(carbonate-siloxane) copolymer; and (c) from 4 wt % to 25 wt % carbon black. The composition has a total siloxane content of from 2 wt % to 14 wt %. The thermoplastic compositions exhibit improved physical properties as compared to compositions that do not include the poly(carbonate-siloxane) copolymer, including volume resistivity, melt viscosity, impact strength, puncture impact energy and surface resistivity.

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Selkirk, NY, United States of America

Norberto Silvi