| 摘要 |
PURPOSE:To prevent settling of a powdered inorganic filler during storage or in casting, by incorporating fine particulate talc having specified particle diameters into a casting resin composition to be used as cast sealing materials for electrical equipment, etc., containing a powdered inorganic filler. CONSTITUTION:A synthetic resin such as an epoxy resin or vinyl chloride resin, a powdered inorganic filler (e.g. calcium carbonate or silica), and 0.5-10wt% talc, based on the total composition, having particle diameters not larger than 50mu are compounded to give the objective casting resin composition. It appears that the talc tends to fill gaps between the powdered inorganic filler particles to e intermingled with the resin, thus serving to disperse the filler particles homogeneously into the resin; therefore, the settling of the powdered inorganic filler in the resin composition can be prevented.
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