Abstract:
Ultrathin copper clad laminates including a fabric sheet material layer having a first planar surface, a second planar surface and an original thickness of from about 10 to about 30 microns and at least one copper foil sheet that is adhered to a planar surface of the fabric sheet material by a cured resin wherein the base laminate has a thickness of from about 1.0 to about 1.75 mils.
Abstract:
There is provided a thermosetting polyimide resin composition which enables production of a cured product exhibiting excellent dimensional stability and which exhibits excellent meltability at low temperature in a semicured state (in the B-stage) and excellent flame resistance in a completely cured state; there are also provided a cured product of such a composition and an interlaminar adhesive film used for a printed wiring board, the interlaminar adhesive film being formed of the composition. In particular, there are provided a thermosetting polyimide resin composition containing a thermosetting polyimide resin (A) having a biphenyl backbone directly linked to a nitrogen atom of a five-membered cyclic imide backbone and a weight-average molecular weight (Mw) of 3,000 to 150,000, a phosphorus compound (B) represented by specific Formula (bl) or (b2), and an epoxy resin (C); a cured product of such a composition; and an interlaminar adhesive film used for a printed wiring board, the interlaminar adhesive film including a layer formed of the composition, the layer being formed on a carrier film.
Abstract:
Provided are a method of manufacturing a high-quality and high-heat-dissipation metal-base substrate that contains no void remaining in the insulative adhesive layer for mounting heat-generating electronic parts and also a method of manufacturing a circuit board. A metal-base substrate 14 is prepared by processing in a dispersing step S1 of dispersing a disperse phase in an insulative adhesive-dispersing medium containing a wetting dispersant, an insulative adhesive-laminating step S2 of laminating the insulative adhesive 2 on a conductor foil 1 as feeding the roll-shaped conductor foil 1, a first curing step S3 of heating the insulative adhesive 2 on the conductor foil 1 and thus forming a composite 5 of the conductor foil 1 and the insulative adhesive layer 2a in the B stage state, a metal-based material-laminating step S5 of laminating a metal-based material 6 on the insulative adhesive layer 2a in the B stage state and thus forming a laminate 7, and a second curing step S6 of converting the insulative adhesive layer 2a in the B stage state into an insulative adhesive layer 2b in the C stage state by heat pressurization of the laminate 7 under a particular condition. The composite 5 or the laminate 7 is also processed, as needed, in a sheet-cutting step S4 or S 15 of cutting it into sheet-shaped articles.
Abstract:
An object of the present invention is to enable formation of a resin layer which reduces the thickness of a multilayered flexible printed wiring board without causing problems in the process of multilayer forming, and is excellent in flexibility. To achieve the object, a resin compound for forming an adhesive layer of a multilayered flexible printed wiring board which is used for formation of an adhesive layer for bonding an outer layer of a printed wiring board onto a surface of an inner layer flexible printed wiring board, the resin compound is made to comprise components A (an epoxy resin composed of one or more selected from the group consisting of bisphenol epoxy resins of which epoxy equivalents are 200 or less and are liquid at room temperature), B (an epoxy resin performing high thermal resistance), C (a phosphorus-containing flame-retardant epoxy resin), D (a rubber-modified polyamide-imide resin, the resin having the property of being soluble in a solvent having a boiling point in the range of 50 to 200°C), and E (a resin curing agent composed of one or more selected from the group consisting of biphenyl type phenol resin and a phenol aralkyl type phenol resin) and a resin-coated copper foil and the like in which the resin layer is formed by using the resin compound is used.
Abstract:
The invention relates to a method for producing a plastic coating with a thickness of less than 200μm on the upper face of a substrate, said method comprising the following steps: application of a plastic powder to the upper face of the substrate by means of a powder spray unit; subsequent cleaning of the underside of the substrate; subsequent melting of the applied powder in an oven, forming the plastic coating on the substrate; and cooling of the substrate, the latter being continuously transported from method step to method step.
Abstract:
A crosslinkable and polymerizable composition containing a monomer and a cross-linking agent is applied onto a metal foil to form a coated film of the composition, and heat is applied to the coated film to firstly bulk polymerize the entire coated film of the crosslinkable and polymerizable composition. Then, by applying heat to the coated film from the metal foil side, cooling a surface far from the metal foil as needed, and subjecting a limited region adjacent to the metal foil in the thickness direction of the coated film to a cross-linking reaction, a composite for multilayer circuit board is obtained, in which the metal foil layer, a hard resin layer containing a hard resin obtained by bulk polymerization reaction and cross-linking reaction, and an adhesive resin layer containing an adhesive resin obtained by bulk polymerization reaction are laminated in this order.
Abstract:
The invention provides a low energy loss, multi-layered polypropylene/metal foil product useful for further processing into printed circuit boards and antenna boards for microwave circuitry. A continuous process for manufacturing the product comprises the steps of: providing metal foil; optionally, extrusion coating molten polypropylene upon the metal foil to obtain a foil coated with a polypropylene foundation layer; unwinding the foil from an unwinding station (10) to an oven (30) before casting a molten polypropylene tie-layer upon the metal foil or the coated foil using extrusion lamination machinery such as a slot die (40) extruder (50); laminating a polypropylene sheet from unwinding station (18) on the tie-layer using compression between rollers (14),(16) in the heated nip area (12) to ensure fusing of the polypropylene layers; and rewinding the multi-layered product on a rewinding station (18). In the process, heat may be applied in one of several ways to induce fusing.