US 11,889,671 B2
Composite material with EMI shielding properties and process to produce it
Olivier Lhost, Havre (BE); Yves Trolez, Arquennes (BE); Anatoli Serghei, Villeurbanne (ER); Hubert Lecocq, Villeurbanne (FR); and Philippe Cassagnau, Villeurbanne (FR)
Assigned to TOTALENERGIES ONETECH, Courbevoie (FR); CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE (CNRS), Paris (FR); and UNIVERSITÉ CLAUDE BERNARD LYON 1 (UCBL), Villeurbanne (FR)
Appl. No. 18/031,227
Filed by TOTALENERGIES ONETECH, Courbevoie (FR); CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE (CNRS), Paris (FR); and UNIVERSITÉ CLAUDE BERNARD LYON 1 (UCBL), Villeurbanne (FR)
PCT Filed Oct. 1, 2021, PCT No. PCT/EP2021/077081
§ 371(c)(1), (2) Date Apr. 11, 2023,
PCT Pub. No. WO2022/084002, PCT Pub. Date Apr. 28, 2022.
Claims priority of application No. 20315437 (EP), filed on Oct. 21, 2020.
Prior Publication US 2023/0276605 A1, Aug. 31, 2023
Int. Cl. H05K 9/00 (2006.01); C08J 3/20 (2006.01); C08K 5/09 (2006.01); C08K 5/20 (2006.01); C08K 9/02 (2006.01)
CPC H05K 9/0088 (2013.01) [C08J 3/203 (2013.01); C08K 5/09 (2013.01); C08K 5/20 (2013.01); C08K 9/02 (2013.01); H05K 9/009 (2013.01); C08J 2323/06 (2013.01); C08J 2323/12 (2013.01); C08J 2325/06 (2013.01)] 15 Claims
 
1. Composite material suitable for use as EMI shielding material, characterized in that it comprises:
a component A being a polymer resin being at least one amorphous polymer resin and/or at least one semi-crystalline polymer resin selected from polyethylene resin and/or polypropylene resin;
from 22.0 to 50.0 wt. % of component B being at least one metal-coated particle based on the total weight of the composite material, wherein the at least one metal-coated particle of component B is metal-coated fibres with an average length of at least 150 μm, and wherein component B has a density of less than 4.0 g/cc; and
from 1.0 to 5.0 wt. % of component C being one or more dispersants based on the total weight of the composite material; wherein one or more dispersants are selected from fatty acids, fatty acid derivatives, ethylene bis stearamide, functionalized waxes, maleic anhydride-grafted polymers and any mixture thereof;
wherein the blend of components A, B and C has a density ranging from 0.8 to 2.0 g/cc as determined by ISO 1183.