| 摘要 |
A hardenable epoxy resin composition which is suitable for the production of an electrical insulation with improved thermal ageing properties, wherein said hardenable epoxy resin composition comprises an epoxy resin, a hardener, an inorganic filler composition, and a coupling agent for improving the bonding between the polymer matrix and the filler, and optionally further additives, characterized in that, (i) the filler composition comprises silica and aluminum trihydride (ATH) at a ratio of silica:ATH from 10:1 to 1:10; (ii) the average particle size distribution of the silica is within the range of from 100 mum-0.5 mum; (iii) the average particle size distribution of ATH is below 10 mum, preferably within the range of from 10.0 mum-0.5 mum; and (iv) the filler composition is present in an amount within the range of 20-80% by weight, calculated to the total weight of the insulating composition, and wherein (v) the coupling agent is present preferably within the range 20 of 0.1%-10% by weight, calculated to the total weight of the insulating composition, the use of the composition for the production of an electrical insulation, and electrical articles containing such an electrical insulation system.
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