Composite material with EMI shielding properties and process to produce it
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
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In an embodiment, component A is or comprises a semi-crystalline polymer resin being at least one polyethylene resin.
The one or more following features can be used to further define component A being at least one polyethylene resin:
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- the at least one polyethylene resin has a melt index MI2 ranging from 0.01 to 100 g/10 min as determined according to ISO 1133 at 190° C. under a load of 2.16 kg; preferably from 0.1 to 100 g/10 min and more preferably from 4 to 25 g/10 min; and/or
- the at least one polyethylene resin has a density ranging from 0.900 g/cm3 to 0.960 g/cm3 as determined according to ISO 1183 at a temperature of 23° C.; and/or
- the at least one polyethylene resin is selected from a polyethylene homopolymer, a copolymer of ethylene with one or more comonomers selected from C3-C20 alpha-olefins and any mixture thereof; and/or
- the at least one polyethylene resin is present in the composite material at a content ranging from 35 to 80 wt. % based on the total weight of the composite material; for example, from 38 to 78 wt. %; for example, from 40 to 75 wt. %; for example, from 45 to 70 wt. %; for example, from 50 to 65 wt. %; and/or
- the at least one polyethylene resin is selected from a virgin polyethylene resin, a post-consumer polyethylene resin and a blend of a virgin polyethylene resin and a post-consumer polyethylene resin; and/or
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