▎ 摘　　要

NOVELTY - Talc provided with at least one carbon-based two and/or three-dimensional nano- or submicron-sized structure provided on its. USE - The talc is useful: in composite structure; and for obtaining carbon-based two-dimensional and/or three- dimensional nano- or submicron-sized structures (all claimed), where resulting, hybrid additive is used as a reinforcement material. ADVANTAGE - The talc: utilizes carbon-based nano- and submicron sized structures, prepared by a method which eliminates graphene aggregation in polymer processing, thus enabling an advantageous usage of a hybrid additive; provides a low-cost and mild process for obtaining carbon-based two-dimensional and/or three-dimensional nano- or submicron-sized structures; provides a low-density hybrid additive which provides a high mechanical strength to composites when introduced as a reinforcement material; and enables a robust, reliable, cost-effective and fast process capable for large volume production of carbon-based two-dimensional and/or three-dimensional nano- or submicron-sized structures, e.g. functional graphene. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: composite structure including a polymer matrix and the talc; and obtaining carbon-based two-dimensional and/or three- dimensional nano- or submicron-sized structures, comprising the consecutive steps, (a) arranging a talc to have a D50 particle size of 10 μ m, and/or within 2-10 μ m, and/or 2 μ m, then activating a surface of the talc, thus obtaining talc with an activated surface, (b) bringing the activated surface into contact with one or more polymers, and (c) pyrolysis and/or carbonization of the polymers when in contact with the activated surface, where in the step (a), the surface of the talc is activated with an activator comprising carboxylic acids, metal salts or metal oxides.