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:
A flexible metal foil/polyimide laminate is prepared by applying a polyamic acid varnish onto a very thin copper foil on a carrier, semi-drying the varnish, laminating a polyimide film to the varnish-coated copper foil using a hot roll press, and heat treating the laminate for solvent removal and imidization in an atmosphere having a controlled oxygen concentration. A polyimide adhesive layer resulting from the imidization of polyamic acid has a thickness of up to 6 μm, the sum of the thicknesses of the polyimide film and the polyimide adhesive layer is up to 25 μm. The polyimide adhesive layer has a Tg>400° C.
Abstract:
A multi-layer printed wire board (PWB) structure optimized for improved drop reliability, reliable electrical connections under thermal load, and minimal thickness is provided, along with a mobile terminal, including the PWB. The PWB includes alternating conductive layers and insulative layers. The outermost three layers form an interconnect structure constructed of two conductive layers surrounding an insulative-coated conductive layer. The thicknesses of the various layers are optimized to have an increased resistance to mechanical shock resulting from, for instance, a drop onto a hard surface. In addition, the optimized PWB structure has a minimized thickness and an improved resistance to connection failures resulting from cyclical thermal loads.
Abstract:
A resin composition, substrate material, sheet, laminated board, resin-bearing copper foil, copper-clad laminate, TAB tape, printed board, prepreg and adhesive sheet are provided which exhibit improved mechanical properties, dimensional stability, heat resistance and flame retardance, particularly high-temperature physical properties. A resin composition containing 100 parts by weight of a thermosetting resin and 0.1-65 parts by weight of an inorganic compound, the resin composition having a mean linear expansion coefficient (α2) of up to 17×10−3 [° C.−1] over the temperature range from a temperature 10° C. higher than a glass transition temperature of the resin composition to a temperature 50° C. higher than the glass transition temperature of the resin composition.
Abstract:
A method for treating a micro-roughened metal surface to improve bonding between the metal surface and a polymer material. The method involves post-treating the micro-roughened conversion coated metal surface with an epoxy resin composition after having formed the micro-roughened conversion coated metal surface with an adhesion promotion composition. The method can be employed in the circuit board industry to improve bonding between innerlayers in a multiplayer circuit board.
Abstract:
A method of constructing a multilayer electric apparatus. The method includes forming a set of conductive features and a plurality of fiducial markings on a first dielectric layer in mutual reference to each other so that their relative positions are known to a first tolerance. Also, a pattern of information corresponding to a desired photoresist exposure pattern for a second layer of the multilayer electric apparatus is stored in a computer readable format. The locations of the fiducial markings on the first layer are measured and the pattern of information for the second layer is altered in correspondence to the measured locations of the fiducial markings. The updated pattern of information is used to control a laser to selectively expose the photoresist on the second layer. Finally, the first and second layers are joined to each other.
Abstract:
A method for making a metal-clad laminate product including: providing a carrier film; depositing directly onto the carrier film a release agent layer, the release agent layer comprising an aqueous soluble polymer; forming a conductive metal layer on the release agent layer, the metal layer having a thickness of less than about 10,000 Angstroms; bonding the metal layer to a circuit board laminate layer; and removing the carrier film from the metal layer by peeling the carrier layer from the release agent layer.
Abstract:
A resin compound, which causes very little thermal stress even when a flip chip is mounted, has a low modulus of elasticity, and a heat resistance which is sufficiently high for solder floating at 300° C., and the resin compound also can be used in an adhesive film, a metal-clad adhesive film, a circuit board, and an assembly structure. The resin compound contains (A) a polyamide imide with siloxane bond, (B) a acrylic polymer with a weight-average molecular weight of 500,000 or more, (C) a thermoset resin, and (D) a solvent.
Abstract:
First and second metal foil layers are laminated on opposite surfaces of a first insulating layer to form a first board. Then, the first and second metal foil layers are formed into predetermined conductor patterns respectively. Then, second and third insulating layers of second and third boards formed separately from the first board are laminated on the first and second metal foil layers through first and second adhesive layers respectively. Then, a thin layer portion is removed and thick layer portions are formed into predetermined conductor patterns respectively in third and fourth metal foil layers of the second and third boards.
Abstract:
A method for treating a micro-roughened metal surface to improve bonding between the metal surface and a polymer material. The method involves post-treating the micro-roughened conversion coated metal surface with an epoxy resin composition after having formed the micro-roughened conversion coated metal surface with an adhesion promotion composition. The method can be employed in the circuit board industry to improve bonding between innerlayers in a multiplayer circuit board.