Composite material with EMI shielding properties and process to produce it
摘要
說明書
With preference, the at least one filler is at least one reinforcement material selected from carbon black, carbon fibers, carbon nanotubes, talc mineral filler, wollastonite, calcium carbonate, modified calcium carbonate, coated calcium carbonate, glass fibres, bamboo fibres, flax fibres, hemp fibres, and any mixture thereof.
Examples of talc that can be used according to the present disclosure are talc filler Finntalc MO5SL and Finntalc M15, both manufactured and sold by Mondo Minerals (CAS-No. 14807-96-6). Finntalc MO5SL has a median particle size (d50) of 2.2 μm. Finntalc M15 has a median particle size (d50) of 4.5 μm.
For example, the at least one filler comprises at least one reinforcement material selected from talc mineral filler, wollastonite, calcium carbonate, modified calcium carbonate, coated calcium carbonate, glass fibres, bamboo fibres, flax fibres, hemp fibres, and any mixture thereof. With preference, the at least one filler is or comprises talc.
The Optional Component E being at Least One Elastomer
In a preferred embodiment, to enhance the impact properties, the composite material may comprise component E being at least one elastomer.
The component E, when present, is preferably selected from copolymers of ethylene with a C3-C10 α-olefin containing at least 20 wt %, preferably from 20 to 70 wt. %, of C3-C10 α-olefin (13C-NMR analysis). Suitable and preferred copolymers that can be used as component E commercially available are obtained with metallocene or constrained geometry catalyst and typically have molecular weight distribution (Mw/Mn measured via GPC) ranging from 1 to 3.
