Abstract:
Embodiments herein relate to creating a high-aspect ratio opening in a package. Embodiments may include applying a first laminate layer on a side of a substrate, applying a seed layer to at least part of the laminate layer, building up one or more copper pads on the seed layer, etching the seed layer to expose a portion of the first laminate layer, applying a second laminate layer to fill in around the sides of one or more copper pads, and removing part of the buildup copper pads. Other embodiments may be described and/or claimed.
Abstract:
A liquid solder resist composition contains a carboxyl group-containing resin, a photopolymerizable compound containing at least one compound selected from a group consisting of a photopolymerizable monomer and a photopolymerizable prepolymer, a photopolymerization initiator, and a titanium dioxide. The photopolymerization initiator contains a bisacylphosphine oxide-based photopolymerization initiator, a first α-hydroxyalkyl phenone-based photopolymerization initiator that is a liquid at 25° C., and a second α-hydroxyalkyl phenone-based photopolymerization initiator that is a solid at 25° C.
Abstract:
Provided is an alkali-developable photocurable/thermosetting resin composition from which a cured coating film that has excellent thermal shock resistance and exhibits excellent PCT resistance, HAST resistance and electroless gold plating resistance, which are important as a solder resist for semiconductor packages, can be formed. The alkali-developable photocurable/thermosetting resin composition is characterized by comprising (A) a carboxyl group-containing photosensitive resin, (B) a photopolymerization initiator, (C) a block copolymer and (D) a thermosetting component.
Abstract:
An electronic device is disclosed herein. In accordance with certain implementations, the electronic device includes a printed circuit board having electrically conductive traces formed thereon. The electronic device also includes a thermochromic solder mask layer overlying the electrically conductive traces. The thermochromic solder mask layer changes color in response to temperature changes associated with operation of the electronic device. The thermochromic characteristics of the solder mask layer are useful for purposes of indicating overheating of the electronic device, the conductive traces, or a region of the printed circuit board.
Abstract:
A conductive pattern is prepared in a polymeric layer that has (a) a reactive polymer comprising pendant tertiary alkyl ester groups, (b) a compound that provides an acid upon exposure to radiation having a λmax of at least 150 nm and up to and including 450 nm, and (c) a crosslinking agent. The polymeric layer is patternwise exposed to provide a polymeric layer comprising non-exposed regions and exposed regions comprising a polymer comprising carboxylic acid groups. The exposed regions are contacted with electroless seed metal ions to form a pattern of electroless seed metal ions. The pattern of electroless seed metal ions is then reduced to provide a pattern of corresponding electroless seed metal nuclei. The corresponding electroless seed metal nuclei are then electrolessly plated with a conductive metal.
Abstract:
A circuit board includes an electrically conductive sheet having an insulative coating surrounding the conductive sheet, with a surface of the insulative coating around an edge of the conductive sheet having an arcuate or rounded shape. At least one electrical conductor is conformally deposited on at least the rounded insulative coating around the edge of the conductive sheet and defined via photolithographic and metallization techniques. Each electrical conductor on the insulative coating thereon around the edge of the conductive sheet conforms to the arcuate or rounded shape of the insulative coating and, therefore, has an arcuate or rounded shape.
Abstract:
The present invention provides a glass fiber product having particles adhered to at least one fiber of the product, where the size and amount of particles is effective to reduce the tackiness of the glass fiber product and optionally effective to reduce interfilament bonding, and composition, and method for forming the same.
Abstract:
An exemplary method of making an FPC includes forming a substrate comprising metal foil layers interleaved with intervening layers by: (a) laminating intervening layers with metal foil layers; (b) adhering a covering film to outermost surfaces of the substrate; (c) defining a hole in one side of the substrate through the covering film and at least two metal foil layers and the intervening layer between the at least two metal foil layers by etching or laser technology; and (d) plating a portion of an inner wall of the hole with conductive material to form a via to electrically connect the at least two metal foil layers.