Insulation-coated electroconductive particles

Abstract

In order to impart excellent solvent resistance and conduction reliability to the insulating coated conductive particles suitable for anisotropic conductive adhesive conductive particles, the surface of the conductive particles is coated with a carboxyl group using a polyfunctional aziridine compound. The insulating resin layer of the insulating-coated electrically-conductive particle covered with the insulating resin layer formed of insulating resin is surface-treated. As the aziridine compound, for example, trimethylolpropane-tri-β-aziridine propionate, tetramethylolmethane-tri-β-aziridine propionate, or N,N-hexamethylene-1,6-bis-1-aziridine carboxamide, etc. The insulating resin layer is preferably composed of an insulating resin having an acrylic monomer unit or a methacrylic monomer unit. Specifically, an acrylic-styrene copolymer is preferable.

Description

technical field [0001] The present invention relates to insulating-coated conductive particles used in anisotropic conductive adhesives. Background technique [0002] As conductive particles used in anisotropic conductive adhesives, insulating-coated conductive particles are widely used, that is, in order to prevent short circuit between conductive particles, metal particles such as nickel are provided with metal plating on the surface of resin particles. Insulation-coated conductive particles formed by coating the surface of conductive particles such as metal-plated particles with thermoplastic insulating resin. [0003] Patent Document 1: Japanese Patent Laid-Open No. 5-217617 [0004] Patent Document 2: Japanese Patent Laid-Open No. 5-70750 [0005] However, if a film-like or paste-like anisotropic conductive adhesive is produced using the insulating-coated conductive particles as described above, there may be a gap between the insulating resin layer coated on the insul...

AI Technical Summary

Problems solved by technology

[0005] However, if a film-like or paste-like anisotropic conductive adhesive is produced using the insulating-coated conductive particles as described above, the insulating-coated conductive particles may exist in some cases. The insulating resin layer coated on the upper surface will swell, dissolve or deform in the solvent used in the manufacture

In such a case, it also adversely affects the conduction reliability of the anisotropic conductive adhesive

[0006] In order to improve the solvent resistance of the insulating resin layer, it is also conceivable to form the insulating resin layer from a thermosetting insulating resin composition, but if the insulating resin layer is too hard , the insulating resin layer cannot be sufficiently excluded from the opposing electrodes that need to be connected, and as a result, there is a problem that sufficient conduction reliability cannot be obtained.