Abstract:
An anisotropic conductive adhesive composition comprising an insulating adhesive component and particles dispersed in said insulating adhesive component, said anisotropic conductive adhesive composition being characterized in that
said insulating adhesive component comprises a copolymer of acrylic ester having an alkyl group of 1-4 carbon atoms and a maleimide derivative, 5 to 60 parts by weight, based on 100 parts by weight of the copolymer, of a thermosetting resin, and 0.05 to 5.0 parts by weight, based on 100 parts by weight of the copolymer, of a coupling agent, and said particles are metallic-layer containing particles comprising a core made of resin, a metallic layer covering said core and a resin layer formed from finely divided resin fixed by the dry blending method on the surface of said metallic layer.
Abstract:
A method of making electrical connections between electrode arrangements (3a, 3b) formed on first and second substrates (1, 2) is described which is particularly advantageous for making connections in liquid crystal displays. The first substrate (1) is placed over the second substrate (2) with the respective electrodes (3a, 3b) in registry and with a UV-light-curable adhesive (4) therebetween. The UV-light-curable adhesive carries first and second kinds of particles (5, 6) dispersed therein. The first and second substrates (1, 2) are pressed against each other and exposed to UV light in order to harden the adhesive (4). The first kind of particles (5) are electrically conductive particles and preferably are resiliently deformable and function to establish current paths between the electrodes of the first and second substrates, and the second kind of particles (6) are smaller than the first and function to prevent the first kind of particles from being destroyed by excessive deformation.
Abstract:
A conductive connecting structure for electrically connecting first and second electronic parts (1, 9) each having a plurality of connecting terminals (8, 16) arranged at a small pitch is disclosed. A conductive bonding agent (17) is interposed between the plurality of connecting terminals of the first and second electronic parts (1, 9). The conductive bonding agent (17) is prepared by mixing a plurality of fine connecting particles (21) in an insulating adhesive (22). Each fine connecting particle (21) is designed such that a fine insulating particle (18) with a plating layer (19) formed on its surface is covered with an insulating layer (20) consisting of a material which is broken upon thermocompression bonding. When the conductive bonding agent (17) is subjected to thermocompression bonding between the connecting terminals (8, 16) of the first and second electronic parts (1, 9), portions of the fine connecting particles (21) which are urged by the respective fine connecting terminals (8, 16) are broken. However, the insulating layers (20) of the fine connecting particles (21) in the planar direction are not broken and remain as they are. In this conductive connecting structure, even if the ratio of fine connecting particles (21) is increased, and adjacent fine connecting particles (21) are brought into contact with each other, insulating properties can be kept in the planar direction, while conduction is obtained only in the direction of thickness.
Abstract:
Electroconductive particles having substantially uniform particle diameters, which are obtained by forming a thin metal layer on the surface of each of fine polymer particles having such a narrow particle diameter distribution that at least 80% by weight of the polymer particles have particle diameters falling within a range of 0.9Sn to 1.1Sn wherein Sn is defined as the number average particle diameter of the polymer particles, as well as an electroconductive adhesive consisting essentially of (a) said electroconductive particles and (b) an electrically insulating adhesive material. Use of this electroconductive adhesive makes it possible to obtain good, anisotropic, electric connection.