Importance

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Abstract

A method of producing a filler-containing film that holds fillers and a fine solid that is made of a material different from that of the filler in an insulating resin layer and in which a predetermined arrangement of the fillers is repeated as viewed in a plan view, where a proportion of (a) a repeat pitch of the fillers after thermocompression bonding under a thermocompression bonding condition with the filler-containing film held between smooth surfaces to (b) a repeat pitch of the fillers before the thermocompression bonding being 300% or less, the method including applying an insulating resin layer-forming composition containing a fine solid to a release substrate to form the insulating resin layer on the release substrate; and pushing the fillers into the insulating resin layer from a surface on a side opposite to the release substrate thereof.

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First Claim