| 摘要 |
PURPOSE:A resin composition which, when laser-marked, can give clear, legible, marked characters, prepared by adding a specified amount of carbon black to a specified resin composition. CONSTITUTION:A resin composition prepared by adding 0.5% or above carbon black to a principal component comprising 10-20wt% novolak epoxy resin, 10- 20% phenol novolak resin or cresol novolak resin and 60-80wt% inorganic filler. The marking of a resin-sealed semiconductor device has been conducted by using a thermosetting ink and, therefore, there has been a problem that the marked characters are thinned down by rubbing in the subsequent steps or during handling in packaging or by swelling during solvent washing. Although laser marking is effective in respect of resistance to detachment of marked characters and the index-up of a marking step, it is not yet put into actual use because the marked characters are not legible. By using the resin composition containing carbon black in an amount increased within the scope not detrimental to the function as an electrical insulating material, clear and legible marked characters can be obtained.
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