Abstract:
A method and composition of matter useful for rendering an insulating material, self-catalytic to deposition of electroless metal from solutions thereof are shown. A base exchangeable clay material such as hectorite is base exchanged with a source of cations of a metal selected from Group I-B and VIII of the Periodic Table of Elements, preferably nickel or copper, and thereafter, the cation exchanged hectorite is heated under reducing conditions. This thermal treatment activates the exchanged hectorite as a catalyst to induce metal deposition in electroless plating baths. Without such a treatment the exchanged hectorite is not catalytic. The structure of the hectorite is altered by the thermal treatment as it no longer swells or gels when immersed in water. In addition the mechanical strength of the material is increased by the ''''sintering like'''' treatment. The modified base exchanged material can be incorporated or coated on insulating materials to provide the exterior or interior surfaces thereof with a catalytic sensitivity to deposition of electroless metal. The methods and compositions are useful in processes for manufacture of printed circuitry on substrates such as films, glass reinforced laminates, tapes, and boards. Methods of molding printed circuit substrates in desired geometrical form with vias located in predetermined pattern are disclosed along with chemical and mechanical methods of etching the surface of resin to expose base exchanged mineral that serves as the catalyst for electroless plating.
Abstract:
This invention provides a prefabricated electric wire assembly board which comprises an insulating base, a preformed, metal conductor bonded to the base, an aperture in the base intersecting the conductor such that at least one end of the conductor is exposed at the wall surrounding the aperture, and a deposit of metal on the wall which contacts and forms an integral bond with the end of the conductor.
Abstract:
This invention relates to new and useful plated through hole printed circuit boards and more particularly to plated through hole printed circuit boards having highly reliable solder joints, and improved methods for producing such boards which include the application of a temporary, strippable solder mask together with a permanent solder mask.
Abstract:
A METHODE FOR RENDERING INSULATING COMPOSITIONS RECEPTIVE TO THE DEPOSITION OF AN ELECTROLESS METAL IS PROVDED WHICH COMPRISES UTILIZING IN SUCH COMPOSITIONS AN ORGANIC COMPOUND OF A METAL WHICH IS A MEMBER SELECTED FROM THE METALS IN GROUPS 1-B AND 8 OF THE PERIODIC TABLE OF ELEMENTS, INCLUDING MIXTURES OF SUCH COMPOUNDS.
Abstract:
Embodiments describe the selective electroless plating of dielectric layers. According to an embodiment, a dielectric layer is patterned to form one or more patterned surfaces. A seed layer is then selectively formed along the patterned surfaces of the dielectric layer. An electroless plating process is used to deposit metal only on the patterned surfaces of the dielectric layer. According to an embodiment, the dielectric layer is doped with an activator precursor. Laser assisted local activation is performed on the patterned surfaces of the dielectric layer in order to selectively form a seed layer only on the patterned surfaces of the dielectric layer by reducing the activator precursor to an oxidation state of zero. According to an additional embodiment, a seed layer is selectively formed on the patterned surfaces of the dielectric layer with a colloidal or ionic seeding solution.
Abstract:
Provided is a doped tin oxide that can be used as a chemical plating promoter in a method for selectively metallizing a surface of an insulating substrate. Also provided are a polymer composition that includes the doped tin oxide, a polymer molded body, an ink composition, and a method for selectively metallizing a surface of an insulating substrate. The doped tin oxide has a light color, and does not interfere with the color of the substrate while presetting thereof. The doped tin oxide has a strong ability of promoting chemical plating. Using the disclosed doped tin oxide as a chemical plating promoter, a continuous metal layer can be formed with a high plating speed, together with enhanced adhesivity between the metal layer and the insulating substrate.
Abstract:
A resin composition for a permanent insulating film is provided, by which, in particular, partial through-holes obtained by partitioning a through-hole can be easily and precisely formed as designed without a deposition of catalytic species (seed) in a plating resist portion. The present invention provides a resin composition for a permanent insulating film, including a thermosetting resin, a resin filler, and a compound containing at least one atom selected from a sulfur atom and a nitrogen atom. The present invention also provides a multilayer printed wiring board in which conductive layers having a circuit pattern and insulation layers are alternately overlaid with each other, and a through-hole enabling electric conductivity among conductive layers via a through-hole. The through-hole includes a plating resist portion provided on either of an interlaminar part between the conductive layer and the insulation layer or another interlaminar part between the insulation layers, or both. The plating portion(s) is/are provided on the interlaminar parts which had been exposed in an opening as the through-hole, and on an exposed region other than the plating resist portion, and the plating resist portion is made of a cured product of the resin composition.
Abstract:
A package structure includes a lead frame, a selective-electroplating epoxy compound, conductive vias and a patterned circuit layer. The lead frame includes a metal stud array having metal studs. The selective-electroplating epoxy compound covers the metal stud array. The selective-electroplating epoxy compound includes non-conductive metal complex. The conductive vias are directly embedded in the selective electroplating epoxy compound to be respectively connected to the metal studs and extended to a top surface of the selective-electroplating epoxy compound. Each of the conductive vias includes a lower segment connected to the corresponding metal stud and an upper segment connected to the lower segment and extended to the top surface, and a smallest diameter of the upper segment is greater than a largest diameter of the lower segment. The patterned circuit layer is directly disposed on the top surface and electrically connected to the conductive vias.
Abstract:
A via in a printed circuit board is composed of a patterned metal layer that extends through a hole in dielectric laminate material that has been covered with catalytic adhesive material on both faces of the dielectric laminate material. The layer of catalytic adhesive coats a portion of the dielectric laminate material around the hole. The patterned metal layer is placed over the catalytic adhesive material on both faces of the dielectric laminate material and within the hole.
Abstract:
A manufacturing method of an embedded wiring board is provided. The method includes the following steps. First, an insulation layer and a lower wiring layer are provided, wherein the insulation layer includes a polymeric material. Then, the plural catalyst grains are distributed in the polymeric material. A groove and an engraved pattern are formed on the upper surface. A blind via is formed on a bottom surface of the groove to expose the lower pad. An upper wiring layer is formed in the engraved pattern. Some catalyst grains are exposed and activated in the groove, the engraved pattern and the blind via. A first conductive pillar is formed in the groove. Finally, a second conductive pillar is formed in the blind via.