Tatsuta Electric Wire & Cable Co., Ltd.

Ken Yukawa

Hiroaki Umeda

Kazuhiro Matsuda

Norihiro Yamaguchi

A conductive coating material is disclosed including at least (A) 100 parts by mass of a binder component including a solid epoxy resin that is a solid at normal temperature and a liquid epoxy resin that is a liquid at normal temperature, (B) 500 to 1800 parts by mass of metal particles that have a tap density of 5.3 to 6.5 g/cmwith respect to 100 parts by mass of the binder component (A), (C) 0.3 to 40 parts by mass of a curing agent that contains at least one imidazole type curing agent with respect to 100 parts by mass of the binder component (A), and (D) 150 to 600 parts by mass of a solvent with respect to 100 parts by mass of the binder component (A).

Conductive coating material and production method for shielded package using conductive coating material

A conductive coating material is disclosed including at least (A) 100 parts by mass of a binder component including 5 to 30 parts by mass of solid epoxy resin that is solid at normal temperature and 20 to 90 parts by mass of liquid epoxy resin that is liquid at normal temperature, (B) 200 to 1800 parts by mass of silver-coated copper alloy particles in which the copper alloy particles are made of an alloy of copper, nickel, and zinc, the silver-coated copper alloy particles have a nickel content of 0.5% to 20% by mass, and the silver-coated copper alloy particles have a zinc content of 1% to 20% by mass with respect to 100 parts by mass of the binder component (A), and (C) 0.3 to 40 parts by mass of a curing agent with respect to 100 parts by mass of the binder component (A).

Provided are a heat dissipation material capable of ensuring stable adhesion while reducing cost, an inlay substrate using the same, and a method for manufacturing the same. A heat dissipation material having adhesive is obtained by coating a portion or the whole of the heat dissipation material with a heat dissipation material adhering composition including a resin component containing an epoxy resin, a curing agent, and an inorganic filler, and having a complex viscosity at 80&#xb0; C. of 1&#xd7;10Pa&#xb7;s to 5&#xd7;10Pa&#xb7;s.

Heat dissipation material adhering composition, heat dissipation material having adhesive, inlay substrate, and method for manufacturing same

A heat dissipation substrate is disclosed including a base substrate having a first surface and a second surface, an electrically conductive path formed on the first surface, a through-hole penetrating from the first surface to the second surface, a heat dissipation member that is inserted into the through-hole and at least a part of which projects from the first surface, a thermally conductive resin constituent, covering a side surface of the heat dissipation member, that is present, without space, between an inner peripheral surface of the through-hole and an outer peripheral surface of the heat dissipation member surrounded by the inner peripheral surface, and a metal layer covering the heat dissipation member projecting from the first surface, in which an outer surface of the metal layer and an outer surface of the electrically conductive path are disposed on substantially the same plane.

Heat dissipation substrate, heat dissipation circuit structure body, and method for manufacturing the same

In a method of manufacturing a multilayer board, including: a drilling step for forming a via hole through a pre-preg by laser beam machining, a step of filling the via hole with conductive paste containing a resin component and metal powder, and a step of arranging copper layers or copper layer portions of patterned boards on and under the filled conductive paste and pressing the same, a multilayer printed wiring board superior in conductivity and long-term stability is obtained by using alloying paste as the conductive paste in which at least part of the metal powder is melted and the metal powders adjacent to each other are alloyed, using a pre-preg having a ratio A/B of at least 10 before subjected to preheating, where A is a storage modulus at an inflection point where the storage modulus changes from increasing to decreasing and B is a storage modulus at an inflection point where the storage modulus changes from decreasing to increasing in a temperature profile rising from 60&#xb0; C. to 200&#xb0; C., and preheating the pre-preg before the drilling step to reduce the ratio A/B to below 10.

Multilayer wiring board

A method of manufacturing a multilayer board, including: forming a hole through a pre-preg by laser, filling the hole with conductive paste containing a resin component and metal powder, and arranging copper layer portions of patterned boards on and under the filled conductive paste and pressing the same, wherein in the conductive paste at least surface layers of the different metal powders are melted and alloyed, the pre-preg has a ratio A/B of at least 10 before being subjected to preheating, where A is a storage modulus at an inflection point where the storage modulus changes from increasing to decreasing and B is a storage modulus at an inflection point where the storage modulus changes from decreasing to increasing in a temperature rising from 60 to 200 degree C., and preheating the pre-preg before the drilling step to reduce the ratio A/B to below 10.

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Kizugawa, Japan

Ken Yukawa