The present invention discloses a method for preparing a novel material layer structure of a circuit board, comprising the steps of: (1) combining a film with a copper layer to form an FCCL single-sided board; (2) applying a semi-cured functional material layer on a back side of the film of the FCCL single-sided board, wherein the semi-cured functional material layer is an MPI film, an LCP film, a TFP film, a PTFE film, a copper ion migration resistant film, an LDK high-frequency functional adhesive, a copper ion migration resistant adhesive, or a mixture of the LDK high-frequency functional adhesive and the copper ion migration resistant adhesive to form a novel material layer structure for a circuit board. An article prepared by performing the above methods is also disclosed. The prepared novel material layer structure of the circuit board has high-frequency characteristics and/or copper ion migration resistance, and can be used as an integral structure. In the circuit board manufacturing process, it can be manufactured as the circuit board manufacturing material to be different circuit board structures, which brings great convenience for subsequent circuit board manufacturing and simplifies the manufacturing process.

A prepreg includes a fiber base material and a thermosetting resin composition impregnated into the fiber base material. The thermosetting resin composition contains a thermosetting resin including an epoxy resin; a curing agent; an inorganic filler; and an acrylic acid ester copolymer having a weight average molecular weight of 10×10.sup.4 or more and less than 45×10.sup.4. A content of the inorganic filler is 150 parts by mass or more relative to a total of 100 parts by mass of the thermosetting resin and the curing agent. A content of the acrylic acid ester copolymer is more than 30 parts by mass and 90 parts by mass or less relative to the total of 100 parts by mass of the thermosetting resin and the curing agent.

A component built-in substrate incorporates a chip capacitor in a multilayer substrate including laminated base material layers made of thermoplastic resin. The chip capacitor includes an uneven portion including a recessed portion and a projected portion on one side in a laminated direction. On one side of the chip capacitor in the multilayer substrate, a density of low fluid member with a melting point higher than a fluidization temperature of the base material layers is higher in a region overlapping the recessed portion of the chip capacitor than in a region overlapping the projected portion of the chip capacitor when viewed in the lamination direction.

A thermosetting polymer formulation includes: 40 to 90 volume percent of a thermosetting polymer system; 10 to 40 volume percent, preferably 20 to 35 volume percent, preferably 20 to 30 volume percent, of a plurality of hexagonal boron nitride platelets having a mean particle diameter of 5 to 20 micrometers, preferably 8 to 15 micrometers, and a D10 particle diameter of 3 to 7 micrometers, preferably 3 to 5 micrometers, and a D90 particle diameter of 20 to 30 micrometers, preferably 25 to 30 micrometers; a total of 0.01 to 10 volume percent of a coupling agent, an impact modifier, a curing agent, a defoamer, a colorant, a thickening agent, a release agent, an accelerator, or a combination comprising at least one of the foregoing, wherein the volume percentages are based on the total volume of the formulation.

Provided are: a prepreg with low dielectric constant, low dielectric loss tangent, and improved adhesiveness to glass cloth; and a laminate for a circuit board. The prepreg is formed of the glass cloth serving as a base material and a semi-cured product of a thermosetting resin composition impregnated into the glass cloth, where the glass cloth comprises a treated surface treated by at least one type of silane coupling agent selected from methacryl-based silane coupling agents, acryl-based silane coupling agents, and isocyanate-based silane coupling agents, and the thermosetting resin composition contains polyphenyleneether having a terminal hydroxyl group modified with an ethylenically unsaturated compound in a main chain of the polyphenyleneether. The laminate for the circuit board is obtained by laminating the prepreg and a conductor layer.

A method for producing an electronic module includes providing a first substrate including at least one first electrical contacting surface, an electronic component including at least one second electrical contacting surface, and a first material layer made of a thermoplastic material including at least one recess extending through the material layer. The first substrate, the electronic component and the first material layer are arranged with the first material layer disposed between the first substrate and the electronic component, and the at least one first electrical contacting surface, the at least one second electrical contacting surface and the at least one recess aligned relative to one another. The first substrate, the electronic component and the material layer are thermocompression bonded. A joint formed between the at least one first electrical contacting surface and the at least one second electrical contacting surface is surrounded or enclosed by the first material layer.

This invention is directed to a polymer thick film conductor composition that provides a better conductor when dried at 80° C. than when dried at 130° C., in contrast to typical PTF conductors. More specifically, the polymer thick film conductor may be used in applications where low temperature curing is required.

The present disclosure relates to a transparent substrate including: a resin pattern layer including a plurality of grooves respectively including side surfaces and a bottom surface; and, a conductive layer formed within the grooves, wherein a line width of the conductive layer is 0.1 μm to 3 μm and an average height of the conductive layer is 5% to 50% of a maximum depth of each of the grooves, and a manufacturing method thereof, such that simplicity in a manufacturing process and a consecutive process are enabled, manufacturing costs are inexpensive, and a transparent substrate having superior electrical conductivity and transparency characteristics is manufactured.

Disclosed is a method for producing a semiconductor device including a circuit board having a flexible resin layer that encapsulates a circuit component. The method may include a step of immersing a flexible substrate in an encapsulant, drying the encapsulant, and thereby encapsulating the circuit component with the encapsulant; and a step of curing the encapsulant, and thereby forming a flexible resin layer.

An electronic device may be provided with printed circuits. Electrical components may be interconnected using signal paths formed from metal traces in the printed circuits. The printed circuits may include flexible printed circuits with bent configurations. The flexible printed circuits may be provided with integral bend retention structures. A bend retention structure may be formed from a polymer layer, a solder layer, a stiffener formed from metal or polymer that is attached to flexible printed circuit layers with adhesive, a conformal plastic coating that covers exposed metal traces at a bend, a metal stiffener with screw holes, a shape memory alloy, a portion of a flexible printed circuit dielectric substrate layer with a reduced elongation at yield value, or combinations of these structures. The bend retention structure maintains a bend in a bent flexible printed circuit.