Composition comprising a comb copolymer

A process of preparing a carbon-based material dispersion comprising the steps of

• i) providing a composition comprising
• a) a polymer a) comprising polymerized units of a N-vinylpyrrolidone, and
• b) a comb copolymer b) having a polymer backbone based on a vinyl aromatic compound comprising one or more of styrene, vinyl toluene, vinyl xylene, or vinyl ethylbenzene and an ethylenically unsaturated polymerizable carboxylic anhydride or acid comprising one or more of maleic anhydride, itaconic anhydride, citraconic anhydride, or fumaric acid, or esters of the foregoing anhydrides, and having at least two polyalkylene oxide side chains;
• wherein the weight ratio of polymer a) to copolymer b) is in a range of 25:75 to 75:25
• ii) providing an electrically conductive carbon-based material comprising at least one of carbon black, carbon nano tubes, graphite, carbon fibers, graphene, and fullerenes,
• iii) mixing the components provided in steps i) and ii) with at least one organic solvent comprising N-methyl pyrrolidone and exerting shear force to prepare a carbon-based material dispersion.