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Process for connecting circuits and adhesive film used therefor

  • US 5,843,251 A
  • Filed: 03/20/1992
  • Issued: 12/01/1998
  • Est. Priority Date: 03/09/1989
  • Status: Expired due to Term
First Claim
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1. A process for electrically connecting circuits by interposing an insulating adhesive between opposing circuits to be connected, at least one of said circuits formed on an insulating layer having a plurality of electrodes projecting from a main face, said projecting electrodes being provided three or more on the average at the periphery or on the entirety of the main face, said projecting electrodes having fine unevenness at a convex end, and said projecting electrodes being deformable under pressure in the circuit connecting operation, and said adhesive comprising as essential components a highly pure liquid epoxy resin reduced in concentration of impurity ions or hydrolytic chlorine ions to a level below 300 ppm for each impurity, a solid resin having a functional group, and a micro-capsule type curing agent having a heat activation temperature of 70°

  • to 200°

    C., and said adhesive being in the form of a film having a thickness of 50 μ

    m or less and a volatile content of 0.5% or less, wherein the adhesive is removed from contact areas of the projecting electrodes and opposing circuits due to lowering in viscosity of the adhesive and is substantially cured after the projecting electrodes have been contacted with the opposing circuits by applying heat and pressure at the time of connection with heating at 70°

    to 200°

    C. for 60 seconds or less per one electrode under a pressure of 1 kgf/cm2 or less per one electrode.

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