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Composite material with EMI shielding properties and process to produce it

專利號(hào)
US11889671B2
公開日期
2024-01-30
申請(qǐng)人
TOTALENERGIES ONETECH; CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE (CNRS); UNIVERSITé CLAUDE BERNARD LYON 1 (UCBL)（FR Courbevoie FR Paris FR Villeurbanne）
發(fā)明人
Olivier Lhost; Yves Trolez; Anatoli Serghei; Hubert Lecocq; Philippe Cassagnau
IPC分類
H05K9/00; C08J3/20; C08K5/09; C08K5/20; C08K9/02
技術(shù)領(lǐng)域
wt,resin,composite,fibres,at,mi2,from,min,shielding,polymer
地域： Courbevoie

摘要

The disclosure provides for a composite material suitable for use as EMI shielding material, remarkable 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 15.0 to 60.0 wt. % of component B being at least one metal-coated particle based on the total weight of the composite material; and from 0.5 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 shows a density ranging from 0.8 to 2.0 g/cc. A process to produce such composite material is also described as well as an EMI shield article made from such composite material and the use of such composite material in an EMO shield article.

說明書

The term “polypropylene resin” or “polyethylene resin” as used herein refers to polypropylene or polyethylene fluff or powder that is extruded, and/or melted and/or pelletized and can be produced through compounding and homogenizing of the polypropylene resin as taught herein, for instance, with mixing and/or extruder equipment. As used herein, the term “polypropylene” may be used as a shorthand for “polypropylene resin”.

The term “fatty acid” is used to define a product of the chemical formula is CnHmO2 with n=6 to 24, and m=2*n (saturated), or m=2*n?2 (mono-unsaturated), or m=2*n?4 (bi-unsaturated), or m=2*n?6 (tri-unsaturated), etc.

The term “fluff” or “powder” as used herein refers to polymer material with the hard catalyst particle at the core of each grain and is defined as the polymer material after it exits the polymerization reactor (or the final polymerization reactor in the case of multiple reactors connected in series).

Under normal production conditions in a production plant, it is expected that the melt index (MI2) will be different for the fluff than for the polyethylene resin and for the polypropylene resin. Under normal production conditions in a production plant, it is expected that the density will be slightly different for the fluff, than for the polyethylene resin and the polypropylene resin. Unless otherwise indicated, density and melt index for the polyethylene resin and the polypropylene resin refer to the density and melt index as measured on the polyethylene resin and for the polypropylene resin as defined above.

As used herein the terms “composite material” are related to the blend of at least one polymer resin with at least one metal-coated particle.

權(quán)利要求

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