ANISOTROPIC ELECTROCONDUCTIVE ADHESIVE SHEET AND COUPLING STRUCTURE

摘要

PROBLEM TO BE SOLVED: To provide an anisotropic electroconductive adhesive sheet achieving good electrically coupling performance without impairing the electrical insulation of spaces among circuits and fine circuits adjacent thereto.

SOLUTION: The anisotropic electroconductive adhesive sheet including at least: a curing agent; a curable electrical insulation resin; and electroconductive particles; is provided. In the adhesive sheet, in a region ranging from the one-side surface of the adhesive sheet along the thickness direction to a position of equal to or less than 1.5 times the average size of the electroconductive particles, 90% or more of the sum of the electroconductive particles are present, and the 90% or more of the electroconductive particles are present without contact with the other electroconductive particles. The average size of the electroconductive particles is 1-8 μm; the average particle distance among adjacent electroconductive particles is ≥1 to ≤5 times the average size thereof but is ≤20 μm; the arrangement pattern of the particles in the planar direction represents a nearly triangular lattice; and the thickness of the anisotropic electroconductive adhesive sheet is twice or greater the average particle distance but is ≤40 μm.

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