Abstract:
An electrical circuit material having a conductive layer disposed a substrate, wherein the substrate is formed from a thermosetting composition comprising a polybutadiene or polyisoprene resin; an optional, functionalized liquid polybutadiene or polyisoprene resin; an optional butadiene- or isoprene-containing copolymer; an optional low molecular weight polymer; an optional curing agent; a cross-linking agent; a particulate fluoropolymer; and about 20 to about 50 percent by weight, based on the total weight of the thermosetting composition, of a magnesium hydroxide having a low ionic content. Use of magnesium hydroxide allows the composition to attain a high level of flame retardancy without use of halogenated flame retardants, while maintaining good moisture absorption and other physical properties.
Abstract:
A composition for preventing creeping for a flux for soldering, which is free from a problem from the viewpoint of the global environment or working environment is provided. The composition comprising a polymer (A) containing the polymer units (a1) derived from an unsaturated ester containing a polyfluroalkyl group and the polymer units (b1) derived from a compound containing a silicon atom and an unsaturated group, and an aqueous medium (B), further optionally including a fluorine type surfactant (c).
Abstract:
A liquid crystalline composite comprising a liquid crystalline polymer, particulate filler, and fibrous web. Further disclosed is a method for forming the liquid crystalline polymer composite. The liquid crystalline polymer composite is useful in circuit materials, circuits, and multi-layer circuits, economical to make, and has excellent flame retardant properties.
Abstract:
An interconnect module providing conductive interconnection paths between an integrated chip, a printed wiring board, and at least one layer within the module, incorporating a plurality of alternating dielectric and conductive layers laminated together to form a unitary structure. The module includes a chip attach surface and a board attach surface, that define contact pads for attachment to corresponding pads on the chip and printed wiring board, respectively, by means of solder balls.
Abstract:
Disclosed are liquid crystalline polymer compositions, which are melt moldable, and which contain a perfluorinated polymer, and a particulate aramid, and optionally contain hollow glass or quartz spheres, and which usually have low dielectric constants. They are particularly useful as electrical connectors and substrates for other electronic applications which use high frequency signals.
Abstract:
A composition usable in hole filling of a metal layer and to planarize the metal layer is provided. The metal layer is part of a substrate which can be part of a multilayer printed circuit board or chip carrier. The composition comprises a fluoropolymer dielectric metal, a filler material, and a coupling agent, the filler material having at least a partial coating of the coupling agent.
Abstract:
The present invention provides a prepreg and a circuit board that can achieve, e.g., low interstitial via connection resistance, excellent connection stability, and high durability, regardless of materials, physical properties, and a combination of the materials of an insulating layer. The present invention also provides a method for manufacturing the prepreg and the circuit board. The prepreg of the present invention includes a laminate including at least one first layer and at least one second layer. The first layer is an insulating layer that includes a resin. The second layer has pores that connect an upper and a lower surface of the second layer, and the upper and the lower surface of the second layer differ from each other in at least one selected from open are ratio and average pore diameter. Using this prepreg makes it possible to provide a circuit board that is characterized, e.g., by low interstitial via connection resistance, excellent connection stability, and high durability.
Abstract:
The present invention provides a nonwoven fabric material prepared from short fibers including thermal-resistant synthetic fibers bound with an inorganic binder, a prepreg and a circuit board using the same. The circuit board has an excellent dimensional stability even at a high temperature, and the circuit board is prevented from warping or being damaged by moisture absorption or the like. The inorganic binder is a residue formed from a low melting point glass solution or a water-dispersible colloidal solution including at least either fibers or particles of low melting point glass dispersed therein. When the binder is used, a chemical covalent bonding by a siloxane bonding is formed.
Abstract:
A platform is provided for the manufacture of microwave, multilayer integrated circuits and microwave, multifunction modules. The manufacturing process involves bonding fluoropolymer composite substrates into a multilayer structure using fusion bonding. The bonded multilayers, with embedded semiconductor devices, etched resistors and circuit patterns, and plated via holes form a self-contained surface mount module. Film bonding, or fusion bonding if possible, may be used to cover embedded semiconductor devices, including embedded active semiconductor devices, with one or more layers.
Abstract:
In a wiring board, predetermined wiring patterns which are formed on both sides of an insulation substrate are electrically connected by an electrically conductive material provided in through holes formed through the insulation substrate. The insulation substrate is composed of a resin impregnated fibrous sheet and a heat resistant film. The present invention solves the problems of the wiring board which are caused by irregularities on the surface of the resin impregnated fibrous sheet. The problems include insufficient adhesion strength between the wiring pattern and the insulation substrate or the limitation of fineness of the wiring pattern due to the irregularities on the surface of the printed wiring board which are formed upon the thermocompression bonding process.