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Composite material with EMI shielding properties and process to produce it

專(zhuān)利號(hào)
US11889671B2
公開(kāi)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(lèi)
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(shuō)明書(shū)

The isotacticity is determined by 13C-NMR analysis on the total polymer. In the spectral region of the methyl groups, the signals corresponding to the pentads mmmm, mmmr, mmrr and mrrm are assigned using published data, for example, A. Razavi, Macromol. Symp., vol. 89, pages 345-367. Only the pentads mmmm, mmmr, mmrr and mrrm are taken into consideration due to the weak intensity of the signals corresponding to the remaining pentads. For the signal relating to the mmrr pentad, a correction is performed for its overlap with a methyl signal related to 2,1-insertions. The percentage of mmmm pentads is then calculated according to
% mmmm=AREAmmmm/(AREAmmmm+AREAmmmr+AREAmmrr+AREAmrrm)·100

Melting temperatures Tm were determined according to ISO 11357-3:2018 on a DSC Q2000 instrument by TA Instruments. To erase the thermal history the samples are first heated to 200° C. and kept at 200° C. for 3 minutes. The reported melting temperatures Tm are then determined with heating and cooling rates of 20° C./min.

The density of polymer or polymer compound is determined according to ISO 1183 at a temperature of 23° C.

Density of fibers (like silver-coated glass fibres presented in the examples) is measured using a Quantachrome Ultrapyc 1200e pycnometer.

    • The temperature of the pycnometer is controlled thanks to an external water bath regulated at 23° C.;

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