PBT-carbon fiber composites for microwave shielding
AssigneeShpp Global Technologies B.V.
InventorNorberto Silvi
Life of this patent
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Abstract
Disclosed is a composite comprising: from about 50 wt. % to about 99 wt. % of a thermoplastic resin, wherein the thermoplastic resin comprises a polyester; and from about 0.1 wt. % to 15 wt. % of a carbon fiber filler, wherein the carbon fiber has a bulk density of at least 500 g/l and a volume electrical resistivity of less than 2,000μΩ#cm, with individual filaments that have a length-to-diameter ratio of at least 300, wherein a 3.175 mm thick molded sample of the composite exhibits a Transmission of less than 15% of incident microwave radiation when observed according to a Free Space method, measured at frequencies of 75 to 110 GHz, wherein the combined weight percent value of all components does not exceed 100 wt. %, and all weight percent values are based on the total weight of the composite.
Claims19
A composite comprising:
- from about 50 wt. % to about 99 wt. % of a thermoplastic resin comprising a polyester and a poly(carbonate-siloxane) copolymer;
- and
- from about 0.1 wt. % to 2 wt. % of a carbon fiber filler, wherein the carbon fiber has a bulk density of at least 500 g/l and a volume electrical resistivity of less than 2,000 μΩ·cm, with individual filaments that have a length-to-diameter ratio of at least 300,
- wherein
- a 3.175 mm thick molded sample of the composite exhibits a Transmission of less than 15% of incident microwave radiation when observed according to a Free Space method, measured at frequencies of 75 to 110 GHz,
- a 3.175 mm thick molded sample of the composite exhibits a Percent Reflected Power measured in Transmission mode of at least 15% when observed according to a Free Space method at frequencies from 75 GHz to 110 GHz, and
- the combined weight percent value of all components does not exceed 100 wt. %, and all weight percent values are based on the total weight of the composite.
Dependencies are inferred from the claim text.