摘要:
In order to improve the manufacturing yield of a semiconductor device having a three-dimensional structure in which a plurality of chips are stacked and attached to each other, the opening shape of each of conductive grooves (4A) formed in each chip (C2) obtained from a wafer (W2) is rectangular, and the number of the conductive grooves (4A) whose long-sides are directed in a Y direction and the number of the conductive grooves (4A) whose long-sides are directed in an X direction perpendicular to the Y direction are made to be approximately equal to each other number in the entire wafer (W2), whereby the film stress upon embedding of a conductive film into the interior of the conductive grooves is reduced, and generation of exfoliation and micro-cracks in the conductive film or warpage and cracks of the wafer (W2) are prevented.
摘要:
An improved process for the production of a water-absorbent resin by reversed phase suspension polymerization of a water-soluble ethylenic unsaturated monomer is disclosed. The process is conducted by subjecting an aqueous solution of a water-soluble ethylenic unsaturated monomer to reversed phase suspension polymerization reaction of a first stage in a petroleum hydrocarbon solvent in the presence of a surfactant and/or polymeric protective colloid by using a radical polymerization initiator optionally in the presence of a crosslinking agent, cooling the resulting slurry to precipitate the surfactant and/or polymeric protective colloid, and adding an aqueous solution of a water-soluble ethylenic unsaturated monomer containing a radical polymerization initiator and optionally a crosslinking agent to the first polymerization reaction system to further carry out the reversed phase suspension polymerization reaction, at least, once.
摘要:
A process for preparing a water-absorbent resin is provided which enables the water-absorbent resin to ensure the reduction in the release amount of liquid and the increase in the liquid diffusibility. In the preparation process, the water-absorbent resin is prepared by polymerization of a water-soluble ethylenic unsaturated monomer. The polymerization of the water-soluble ethylenic unsaturated monomer is allowed to take place in the presence of a water-absorbent resin having a water-absorbing rate different from that of a water-absorbent resin resulting from polymerization of the water-soluble ethylenic unsaturated monomer. In a preferred mode, the polymerization is performed by a reversed-phase suspension polymerization method.
摘要:
A high frequency semiconductor device includes: a substrate having a substantially flat principal surface, with a predetermined circuit pattern including at least an input line, an output line, and a ground electrode provided on the principal surface; and a transistor which has a drain electrode, a source electrode, and a gate electrode and is mounted on the substrate by a flip chip mounting. The source electrode and the ground electrode are connected to each other by a first bump in the flip chip mounting.
摘要:
A semiconductor chip is mounted on the central portion of a metal heat radiator. A pair of metal projecting members are provided on the heat radiator externally of the pair of opposed sides of the semiconductor chip to extend therealong beyond both ends of the semiconductor chip. A circuit board is mounted on the side of each of the pair of projecting members opposed to the semiconductor chip. The top surface of the semiconductor chip and the top surface of each of the projecting members are connected to each other by a third bonding wire for grounding.
摘要:
A radio frequency power amplification module includes: a radiation section; a printed circuit board attached to the radiation section; a semiconductor device for power amplification, mounted on the printed circuit board; and a cap. The radiation section includes a plurality of radiation boards, the plurality of radiation boards at least including a first radiation board as a lowermost layer, and a second radiation board attached onto the first radiation board, the first radiation board being coupled to the cap.
摘要:
The present invention is directed to a method for production of alkylene oxide polymers comprising reacting an alkylene oxide in an inert hydrocarbon solvent in the presence of a catalyst. The method of the present invention offers alkylene oxide polymers with a great commercial value and a high degree of polymerization which can be produced industrially advantageously with high reproducibility by the use of a catalyst obtained by a simple procedure of applying heat treatment to the product obtained by reacting an organic zinc compound with particular aliphatic polyhydric alcohol and monohydric alcohol.
摘要:
A water-absorbent resin having excellent physical properties can be produced by a process wherein an aqueous solution containing an .alpha.,.beta.-unsaturated carboxylic acid and an alkali metal salt thereof in a total amount of 25% by weight or more is subjected to polymerization with a radical polymerization initiator in a petroleum-based hydrocarbon solvent in the presence or absence of a crosslinking agent, characterized by using, as a surfactant, a polyglycerine--fatty acid ester having an HLB of 2 to 16 and represented by the general formula ##STR1## (wherein R is an acyl group or hydrogen atom and n is an integer of 0 to 8).
摘要:
Water-swellable elastomer composition consisting essentially of a homogeneous mixture of an elastomer, a water-absorbent resin and a water-soluble resin. Said composition exhibits a high degree of swelling and a high swelling rate when it is soaked in water. Also, said composition retains swellability even when it is put in contact with water for a long period of time.
摘要:
Water-absorbent resins having improved water-absorbency, water-absorption rate and water-dispersibility can be produced by crosslinking a water-absorbent resin comprising a carboxylate as a constituent of the resin with a crosslinking agent having at least two functional groups in the presence of water in a proportion of 0.01 to 1.3 parts by weight per part by weight of the resin in an inert solvent.