Abstract:
An aspect of the present invention comprises a method of forming holes in a dielectric substrate comprising the steps of applying a layer of photoresist to a dielectric substrate, exposing portions of the photoresist to actinic radiation through a photomask to form a pattern in the photoresist for an array of holes to be etched in the substrate, developing the photoresist, etching the dielectric substrate to form an array of holes, each hole extending at least partially through the dielectric substrate, and removing the excess photoresist. Another aspect of the present invention is a method of simultaneously forming holes in a dielectric substrate some of which extend partially through the substrate and some of which extend completely through the substrate. Other aspects of the present invention are dielectric substrates formed using the methods of the invention.
Abstract:
Window manufacture method of semiconductor package type printed circuit board of the present invention comprises an imaging step to expose to outer as pressing a dry film, excepts a bond finger part is formed in both sides of bronze coated circuit board, an etching step to be formed bond finger to get rid of bronze of exposed the imaging step, a strip step to eliminate the pressed dry film after formed bond finger in the etching step, a solder regist spread step to insulate all area except bond finger and solder boland to be formed by the strip step, a nickel/gold plating to be formed nickel/gold plating layer to do electroplating on exposed bond finger and solder boland in the solder regist spread step.
Abstract:
A circuit board or each circuit board of a multi-layer circuit board includes an electrically conductive sheet coated with an insulating top layer covering one surface of the conductive sheet, an insulating bottom layer covering another surface of the conductive sheet and an insulating edge layer covering an edge of the conductive sheet. An insulating interlayer can be sandwiched between a pair of adjacent circuit boards of a multi-layer circuit board assembly. A landless through-hole or via can extend through one or more of the circuit boards for connecting electrical conductors on opposing surfaces thereof.
Abstract:
A method a forming a resin compatible fabric (210) includes: (A) forming a fabric with a plurality of fiber strands, wherein at least one of the plurality of fiber strands includes a plurality of fibers and at least one of the plurality of fibers includes an at least partial coating (214) having at least one starch material with at least one hydroxyl group; (B) breaking a bond between a hydrogen atom of a hydroxyl group of a first starch molecule of the at least one starch material with an oxygen atom of a second starch molecule of the at least one starch material to form at least one unreacted hydroxyl group on the first starch molecule; and (C) reacting at least one functional group of a second material with the at least one unreacted hydroxyl group of the at least one starch material to form a grafted starch material after interweaving.
Abstract:
An improved interposer for use in forming an electrical connection between electrical components. The interposer includes a bi-lobate contact pad made of an elastomeric material embedded with conductive metallic granules.
Abstract:
The present invention provides an at least partially coated fiber strand comprising a plurality of glass fibers having a resin compatible coating composition on at least a portion of a surface of at least one of said glass fibers, the resin compatible coating composition comprising: (a) a plurality of lamellar, inorganic particles and (b) at least one polymeric material. The present invention further provides that the resin compatible coating composition comprises (a) a plurality of discrete particles formed from materials selected from non-heat expandable organic materials, inorganic polymeric materials, non-heat expandable composite materials and mixtures thereof, the particles having an average particle size sufficient to allow strand wet out; (b) at least one lubricious material different from said plurality of discrete particles; and (c) at least one film-forming material. The present invention further provides that the resin compatible coating composition comprises (a) a plurality of hollow, non-heat expandable organicparticles; and (b) at least one lubricious material different from the at least one hollow organic particle.
Abstract:
The present invention provides an at least partially coated fiber strand comprising a plurality of glass fibers having a resin compatible coating composition on at least a portion of a surface of at least one of said glass fibers, the resin compatible coating composition comprising: (a) a plurality of lamellar, inorganic particles having a Mohs' hardness value which does not exceed the Mohs' hardness value of said glass fibers; and (b) at least one polymeric material. The present invention further provides the use of a resin compatible coating composition comprising: (a) a plurality of discrete particles formed from materials selected from non-heat expandable organic materials, inorganic polymeric materials, non-heat expandable composite materials and mixtures thereof, the particles having an average particle size sufficient to allow strand wet out; (b) at least one lubricious material different from said plurality of discrete particles; and (c) at least one film-forming material. The resin compatible coating composition can also comprise: (a) a plurality of hollow, non-heat expandable organic particles; and (b) at least one lubricious material different from the at least one hollow organic particle.
Abstract:
This invention relates to an adhesion promoting composition and method for its use for promoting adhesion of printed circuits on thermoplastic substrates. The composition includes isopropanol with either methylene chloride or resorcinol. An added ingredient includes polycyclohexanone. The preferred substrate is polyarylsulfone.
Abstract:
This invention relates to a solder mask composition for thermoplastic substrates. The solder mask has critical components which include a polyhydroxyether and melamine formaldehyde. Other components include a solvent, filler and flow control agent. Optional ingredients include a colorant, epoxy resin and acid to promote the reaction of the composition. A surfactant can also be included. The solder mask provides the necessary flexibility and adhesion required for thermoplastic circuit boards. The mask can be applied directly to a circuit board or to a transfer medium for subsequent covering of a substrate. It relates to an article which can be a circuit board. It also relates to a process for making such composites which includes processing the solder mask.