Polymer composition comprising: (a) at least one homopolymer or copolymer of ethylene; (b) at least one paste with a high concentration of an exfoliated layered material comprising: (i) from 1% by weight to 20% by weight, preferably from 10% by weight to 18% by weight, of at least one exfoliated layered material selected from graphene; graphene oxide; reduced graphene oxide; graphene nanoplates; boron nitride; phosphorene (monoatomic layer of black phosphorus); di- and tri-chalcogenides of transition metals such as tungsten disulfide, tungsten diselenide, molybdenum disulfide, bismuth tellurium; or mixtures thereof; preferably, it is selected from graphene, graphene nanoplates, or mixtures thereof; (ii) from 10% by weight to 90% by weight, preferably from 15% by weight to 85% by weight, of at least one first additive selected from liquid stabilizers at room temperature, said at least one first additive being selected from: (ii 1) phenol-based antioxidants such as sterically hindered phenols; (ii 2) antioxidants based on organic phosphites; (iii) from 0% by weight to 15% by weight, preferably from 3% by weight to 8% by weight, of at least one organic solvent; (iv) from 0% by weight to 30% by weight, preferably from 5% by weight to 20% by weight, of at least one second additive selected from: light stabilizers, ultraviolet ray stabilizers (UV absorbers), metallic stearates, alcohols, ketones, ethers, glycols or poly-alkylene glycols; the sum of (i) + (ii) + (iii) + (iv) being equal to 100. (a) at least one homopolymer or copolymer of ethylene; (b) at least one paste with a high concentration of an exfoliated layered material comprising: (i) from 1% by weight to 20% by weight, preferably from 10% by weight to 18% by weight, of at least one exfoliated layered material selected from graphene; graphene oxide; reduced graphene oxide; graphene nanoplates; boron nitride; phosphorene (monoatomic layer of black phosphorus); di- and tri-chalcogenides of transition metals such as tungsten disulfide, tungsten diselenide, molybdenum disulfide, bismuth tellurium; or mixtures thereof; preferably, it is selected from graphene, graphene nanoplates, or mixtures thereof; (ii) from 10% by weight to 90% by weight, preferably from 15% by weight to 85% by weight, of at least one first additive selected from liquid stabilizers at room temperature, said at least one first additive being selected from: (ii 1) phenol-based antioxidants such as sterically hindered phenols; (ii 2) antioxidants based on organic phosphites; (iii) from 0% by weight to 15% by weight, preferably from 3% by weight to 8% by weight, of at least one organic solvent; (iv) from 0% by weight to 30% by weight, preferably from 5% by weight to 20% by weight, of at least one second additive selected from: light stabilizers, ultraviolet ray stabilizers (UV absorbers), metallic stearates, alcohols, ketones, ethers, glycols or poly-alkylene glycols; (i) from 1% by weight to 20% by weight, preferably from 10% by weight to 18% by weight, of at least one exfoliated layered material selected from graphene; graphene oxide; reduced graphene oxide; graphene nanoplates; boron nitride; phosphorene (monoatomic layer of black phosphorus); di- and tri-chalcogenides of transition metals such as tungsten disulfide, tungsten diselenide, molybdenum disulfide, bismuth tellurium; or mixtures thereof; preferably, it is selected from graphene, graphene nanoplates, or mixtures thereof; (ii) from 10% by weight to 90% by weight, preferably from 15% by weight to 85% by weight, of at least one first additive selected from liquid stabilizers at room temperature, said at least one first additive being selected from: (ii 1) phenol-based antioxidants such as sterically hindered phenols; (ii 2) antioxidants based on organic phosphites; (iii) from 0% by weight to 15% by weight, preferably from 3% by weight to 8% by weight, of at least one organic solvent; (iv) from 0% by weight to 30% by weight, preferably from 5% by weight to 20% by weight, of at least one second additive selected from: light stabilizers, ultraviolet ray stabilizers (UV absorbers), metallic stearates, alcohols, ketones, ethers, glycols or poly-alkylene glycols;