Compositions for use in electromagnetic interference shielding
AssigneeCarbonX IP 7 B.V.
InventorsRutger Alexander David van Raalten, Daniela Sordi, Laure Aude Marie Suzanne Hannebicque, Zhen Liu
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Abstract
The invention pertains to the use of porous, chemically interconnected, isotropic carbon-nanofibre-comprising carbon networks for electromagnetic interference shielding (EMI). The invention also relates to a A composite assembly comprising a thermoplastic, elastomeric and/or thermoset polymer matrix and at least 15 wt%, preferably at least 20 wt%, more preferably 20 - 80 wt% of porous, chemically interconnected, crystalline carbon-nanofibres comprising carbon networks based on the total assembly weight.
Claims20
A method for electromagnetic interference (EMI) shielding by providing an assembly with porous, covalently bonded, crystalline carbon-nanofibres comprising carbon networks, wherein the carbon networks are intraparticle porous networks wherein the carbon nanofibers are interconnected to other carbon nanofibers in the networks by covalent bonds via junctions, wherein the pores in the networks have an intraparticle pore diameter size of 5-150 nm using Mercury Intrusion Porosimetry according to ASTM D4404-10, wherein at least 20 wt% of the carbon in the carbon networks is in crystalline form, and the carbon nanofibers have an average aspect ratio of fibre length-to-thickness of at least 2.
A EMI shielding composite assembly comprising a thermoplastic, elastomeric and/or thermoset polymer matrix and at least 15 wt% of porous, covalently bonded, crystalline carbon-nanofibres comprising carbon networks based on the total assembly weight, wherein the carbon networks are intraparticle porous networks wherein the carbon nanofibers are interconnected to other carbon nanofibers in the networks by covalent bonds via junctions, wherein the pores in the networks have an intraparticle pore diameter size of 5-150 nm using Mercury Intrusion Porosimetry according to ASTM D4404-10, wherein at least 20 wt% of the carbon in the carbon networks is in crystalline form, and the carbon nanofibers have an average aspect ratio of fibre length-to-thickness of at least 2,
- the assembly having an electromagnetic shielding effectiveness of at least 20 dB at frequencies between 10 MHz and 40 GHz according to IEEE299 on the outer surface of the assembly.
A EMI shielding composite assembly comprising a thermoplastic, elastomeric and/or thermoset polymer matrix and one or more EMI shielding agents selected from carbon nanotubes (CNT), carbon fibres (CF), glass fibres (GF), steel fibres (SF) and porous, covalently bonded, crystalline carbon-nanofibres comprising carbon networks, wherein at least 15 wt% of the sum of all shielding agent(s), the number based on the weight of the assembly, and wherein the amount of porous, covalently bonded, crystalline carbon-nanofibres comprising carbon networks is at least 1 wt% of the assembly, wherein the carbon networks are intraparticle porous networks wherein the carbon nanofibers are interconnected to other carbon nanofibers in the networks by covalent bonds via junctions, wherein the pores in the networks have an intraparticle pore diameter size of 5-150 nm using Mercury Intrusion Porosimetry according to ASTM D4404-10, wherein at least 20 wt% of the carbon in the carbon networks is in crystalline form, and the carbon nanofibers have an average aspect ratio of fibre length-to-thickness of at least 2,
- the assembly having an electromagnetic shielding effectiveness of at least 20 dB at frequencies between 10 MHz and 40 GHz according to IEEE299 on the outer surface of the assembly.
Dependencies are inferred from the claim text.