▎ 摘　　要

NOVELTY - A polymer nanocomposite comprises at least one polymer matrix, at least one inorganic filler, at least one carbonaceous filler and at least one additive. USE - Polymer nanocomposites are used in manufacture of electrical and electronic equipments, as insulating layers on circuit boards, semiconductors, transistors, capacitors, batteries, electro-electronic devices, or as insulating for electrical wires and cables (all claimed). ADVANTAGE - The polymer nanocomposites of high thermal conductivity, and thermal conductivity gain, is suitable for use electrical insulating material in electrical and electronic equipments. The nanocomposite provides better heat dissipation and increased reliability to miniaturized electronic devices, to enable to operate at higher temperatures without loss of efficiency or failures, and possibility of greater electric power transmission capacity. The material provides better thermal management, to influence the thickness of insulating layer, so that a reduced layer can be used, thus reducing the logistical costs resulting from the reduction of mass and volume of the device as a whole. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: 1) preparation of polymer nanocomposite, which involves: a) drying inorganic fillers for 2-8 hours at 70-120°C; b) incorporating additives (fillers, crosslinking agent, antioxidants) into olefin-based polymers, through melt processing, using extruders, injectors, open mixers, closed mixers and/or roller mills, at 80-200°C; c) granulating, grinding or pelletizing the material obtained in step b; d) drying the granulated material for 2-24 hours at 50-80°C; and e) crosslinking the material at 130-200°C, for 1-30 minutes; and 2) use of polymer nanocomposites, which involves using polymer nanocomposite in the manufacture of electrical and electronic equipment with properties suitable for applications such as electrical insulation, and with thermal conductivity gain.