Abstract:
Provided is a heat-curable resin filler in which the deterioration in thixotropic properties over time can be prevented and which has excellent shape retaining properties after being filled in hole parts in a printed wiring board and being cured and also has excellent abradability. The heat-curable resin filler comprises an epoxy resin, an epoxy resin curing agent, an inorganic filler and a fatty acid represented by the following general formula: (R1COO)n-R2 (wherein the substituent R1 represents a hydrocarbon group having 5 or more carbon atoms; the substituent R2 represents a hydrogen atom, an metal alkoxide group or a metal atom; and n is 1 to 4).
Abstract:
In one embodiment of the present invention, inert nano-sized particles having dimensions from 1 nm to 1,000 nm are added into a solder ball. The inert nano-sized particles may comprise metal oxides, metal nitrides, metal carbides, metal borides, etc. The inert nano-sized particles may be a single compound, or may be a metallic material having a coating of a different material. In another embodiment of the present invention, a small quantity of at least one elemental metal that forms stable high melting intermetallic compound with tin is added to a solder ball. The added at least one elemental metal forms precipitates of intermetallic compounds with tin, which are dispersed as fine particles in the solder.
Abstract:
A surface mount adhesive includes an epoxy resin, a curing agent, an accelerator, a first filler, and a second filler. The second filler has a specific gravity 1.1 to 3 times that of the first filler, and the second filler has a hardness higher than that of the first filler. The first filler has a largest particle size of 1 to 100 μm, and the second filler has a largest particle size of 1 to 100 μm, a specific gravity of 1.7 to 4.5, and a revised Mohs hardness of 2 to 12. The weight ratio of the first filler to the second filler is from 1:3 to 3:1, and the surface mount adhesive has a specific gravity of 1.2 to 1.5. When the surface mount adhesive is dispensed, dispensing failures are suppressed, and dispensing stability is improved.
Abstract:
A wiring board according to an embodiment includes an inorganic insulating layer provided with a via-hole which is a penetrating hole, and a via-conductor which is a penetrating conductor disposed inside the via-hole. The inorganic insulating layer includes first inorganic insulating particles connected to each other and second inorganic insulating particles that are larger in particle size than the first inorganic insulating particles and are connected to each other via the first inorganic insulating particles, and also has, at an inner wall of the via-hole V, a protrusion including at least part of the second inorganic insulating particle. The protrusion is covered with the via-conductor.
Abstract:
To provide a liquid crystal polyester composition which is suited for use as a material for forming a liquid crystal polyester film having excellent thermal conductivity. Also, an excellent electronic circuit board is provided by using an insulating film obtained from the liquid crystal polyester composition. The liquid crystal polyester composition of the present invention is composed of a liquid crystal polyester, a solvent and a thermally conductive filler. The thermally conductive filler is contained in the amount of 50 to 90 volume % based on the total amount of the liquid crystal polyester and the thermally conductive filler, and the thermally conductive filler contains 0 to 20 volume % of a first thermally conductive filler having a volume average particle diameter of 0.1 μm or more and less than 1.0 μm, 5 to 40 volume % of a second thermally conductive filler having a volume average particle diameter of 1.0 μm or more and less than 5.0 μm and 40 to 90 volume % of a third thermally conductive filler having a volume average particle diameter of 5.0 μm or more and 30.0 μm or less.
Abstract:
A thermally conductive composition is made to contain a cured thermosetting resin containing a crystalline epoxy resin component, and an inorganic filler. The content by percentage of the inorganic filler in the thermally conductive composition is 66% or more and 90% or less by volume. This thermally conductive composition has a main portion made mainly of the inorganic filler, and a surface layer portion made mainly of the crystalline epoxy component and formed on the main portion to be continuous to the main portion.
Abstract:
Disclosed herein are a prepreg including an insulating resin composition impregnated into a porous support, and a printed circuit board including the same as an insulating layer. According to the present invention, the porous support used for impregnation of the insulating resin composition has excellent thermal stability and wide surface area, a coefficient of thermal expansion (CTE) of the porous support is not changed according to directivity, and the prepreg has a structure in which fillers included in the insulating resin composition are dispersed between the porous supports, such that the CTE may be efficiently improved. In addition, although damage is generated from the outside, the damage is not enlarged due to adjacent porous supports but is only locally generated and physical properties for pressure load is excellent due to the porous structure, such that damage of the printed circuit board may be reduced.
Abstract:
Provided is a metal base circuit board having a new function of a light reflection in addition to the conventional printed circuit board function for mounting electronic parts. The metal base circuit board has a circuit arranged on a metal plate via an insulation layer. A white film is arranged at least one the insulation layer.
Abstract:
A circuitized substrate which includes at least one circuit layer and at least one substantially solid dielectric layer comprised of a dielectric composition which includes a cured resin material and a predetermined percentage by weight of particulate fillers, but not including continuous or semi-continuous fibers as part thereof.
Abstract:
An object of the invention is to provide a prepreg which can be thinner, and has both surfaces which have different application, function, performance or properties to each other, one of which has excellent adhesion to the conductive layer, and the conductive layer which is in contact with the one surface of the prepreg can form a fine circuit, and the present invention provides a prepreg including a core layer containing a fibrous base, a first resin layer which is formed on one surface of the core layer, a second layer which is formed on the other surface of the core layer, and a carrier film which is selected from the group consisting of a metal foil and a resin film and which is laminated on at least one of the surfaces of the first resin layer and the second resin layer, wherein the first resin layer contains a first epoxy resin composition containing silica nanoparticles having an average particle diameter of 1 to 100 nm; a thermoplastic resin selected from the group consisting of a polyimide resin, a polyamide resin, a phenoxy resin, a polyphenylene oxide resin, and a polyether sulfone resin; and an epoxy resin, and the first resin layer is in contact with the fibrous base or a part of the first resin layer is infiltrated into the fibrous base; the second resin layer contains a second epoxy resin composition containing an inorganic filler, and an epoxy resin, and a part of the second resin layer is infiltrated into the fibrous base.