Electronic device
An anisotropic conductive film, the anisotropic conductive film including an insulating layer and a conductive layer laminated on the insulating layer, the conductive layer containing conductive particles, wherein after glass substrates are positioned to face each other on the upper and lower surface of the anisotropic conductive film and are pressed against the anisotropic conductive film at 3 MPa (based on the sample area) and 160° C. (based on the detection temperature of the anisotropic conductive film) for 5 sec, a ratio of the area of the insulating layer to that of the conductive layer is from about 1.3:1 to about 3.0:1.
1. An electronic device, comprising:
an anisotropic conductive film, the anisotropic conductive film including an insulating layer and a conductive layer laminated on the insulating layer, the conductive layer containing insulating particles and conductive particles, wherein,
the lowest melt viscosity of the insulating layer is in the range of about 2,000 Pa·s to about 10,000 Pa·s and the lowest melt viscosity of the conductive layer is in the range of about 5,000 to about 50,000 Pa·s, provided that the lowest melt viscosity of the conductive layer is at least about 3,000 Pa·s greater than that of the insulating layer,
the insulating layer is from greater than 1 to about 4 times thicker than the conductive layer,
the insulating layer is formed from a first composition that comprises a first polymer resin, a first radically polymerizable material, and a first radical initiator, wherein the first polymer resin includes one or more of an olefinic resin, a butadiene resin, an acrylonitrile-butadiene copolymer, a carboxyl-terminated acrylonitrile-butadiene copolymer, a polyimide resin, a polyamide resin, a polyester resin, a polyvinyl butyral resin, an ethylene-vinyl acetate copolymer, a styrene-butylene-styrene (SBS) resin, a styrene-ethylene-butylene-styrene (SEBS) resin, an acrylonitrile-butadiene rubbers (NBRs), a urethane resin, a (meth)acrylic resin, or a phenoxy resin, and the first radically polymerizable material includes a first epoxy (meth)acrylate oligomer, the first epoxy (meth)acrylate oligomer being present in an amount of 20 to 40 wt %, based on a total weight of the first composition,
the conductive layer is formed from a second composition that comprises a second polymer resin, a second radically polymerizable material, and a second radical initiator, wherein the second polymer resin includes one or more of an olefinic resin, a butadiene resin, an acrylonitrile-butadiene copolymer, a carboxyl-terminated acrylonitrile-butadiene copolymer, a polyimide resin, a polyamide resin, a polyester resin, a polyvinyl butyral resin, an ethylene-vinyl acetate copolymer, a styrene-butylene-styrene (SBS) resin, a styrene-ethylene-butylene-styrene (SEBS) resin, an acrylonitrile-butadiene rubbers (NBRs), a urethane resin, a (meth)acrylic resin, or a phenoxy resin, and the second radically polymerizable material includes a second epoxy (meth)acrylate oligomer, the second epoxy (meth)acrylate oligomer being present in an amount of 20 to 30 wt %, based on a total weight of the second composition,
a size of the conductive particles is in the range of about 1 to about 30 μm, the conductive particles being present in an amount of about 1 to about 30% by weight, based on the total weight of the second composition,
a size of the insulating particles is in the range of about 0.1 to about 20 μm, the insulating particles being present in an amount of about 2 to about 20% by weight, based on the total weight of the second composition.
2. The electronic device as claimed in claim 1 , wherein the lowest melt viscosity of the conductive layer is about 3,000 to about 48,000 Pa·s greater than that of the insulating layer.
3. The electronic device as claimed in claim 1 , wherein the insulating layer includes insulating particles.
4. The electronic device as claimed in claim 3 , wherein the insulating particles are present in an amount of about 0.1 to about 20% by weight, based on the total weight of a composition for the insulating layer.
5. The electronic device as claimed in claim 4 , wherein the amount (% by weight) of the insulating particles in the conductive layer with respect to the total weight of the composition for the conductive layer is higher than that of the insulating particles in the insulating layer with respect to the total weight of the composition for the insulating layer.
6. The electronic device as claimed in claim 3 , wherein the insulating particles are present in an amount of about 0.1 to about 10% by weight, based on the total weight of a composition for the insulating layer.
7. The electronic device as claimed in claim 1 , wherein:
the first radically polymerizable material is present in the first composition in an amount of about 20 to about 60% by weight, based on the total weight of the first composition, and
the second radically polymerizable material is present in the second composition in an amount of about 20 to about 60% by weight, based on the total weight of the second composition.
8. The electronic device as claimed in claim 1 , wherein the first composition further includes a silane coupling agent, and the silane coupling agent is present in an amount of about 0.1 to about 5% by weight, based on the total weight of the first composition.