Matte-type electromagnetic interference shielding film comprising bio-based component and preparation method thereof

A matte-type electromagnetic interference shielding film, comprising bio-based components, comprising:

• a bio-based electrically conductive adhesive layer with a thickness of 3 to 50 μm and containing a bio-based resin and a petrochemical-based resin;
• a metal layer having a thickness of 0.1 to 15 μm, which is a plated metal layer and is formed on the bio-based electrically conductive adhesive layer;
• and
• a bio-based insulating layer containing a bio-based resin and a petrochemical-based resin with a thickness of 2 to 50 μm, which is formed on the metal layer, allowing the metal layer to be located between the bio-based insulating layer and the bio-based electrically conductive adhesive layer,
• wherein the bio-based insulating layer has a first surface and a second surface being opposite to the first surface and facing towards the metal layer, and the first surface and the second surface have different surface roughness Rz which are between 0.001 and 10 μm;
• wherein the matte-type electromagnetic interference shielding film contains a bio-based content of 20-100%, by the ratio of the biomass-derived carbon to the petroleum-derived carbon, according to ASTM D6866-12,
• wherein the bio-based resin and the petrochemical-based resin in each of the bio-based insulating layer and the bio-based electrically conductive adhesive layer are each independently at least one selected from the group consisting of acrylic resin, polyurethane, urethane resin, silastic resin, poly-p-xylene resin, bismaleimide resin, styrene-ethylene-butene-styrene block copolymer, polyimide resin and polyamide-imide.