Nitto-denko Corporation

Toshio Shintani

Fumiteru Asai

Yasuhito Ohwaki

Shinsuke Ikishima

Shigenori Morita

Kazuyuki Kiuchi

Tadao Ookawa

Kouji Akazawa

Tomokazu Takahashi

Akiyoshi Yamamoto

Yuji Okawa

Makoto Komatsubara

Takashi Habu

Kouichi Hashimoto

Akinori Nishio

Tadatoshi Nakanishi

Syouji Yamamoto

Kouhei Takeda

The present invention provides a substrate-less pressure-sensitive adhesive sheet for protection of semiconductor wafer, which is to be stuck to a front surface of a semiconductor wafer in grinding a back surface of the semiconductor wafer, the pressure-sensitive adhesive sheet consisting of a pressure-sensitive adhesive layer, in which the pressure-sensitive adhesive layer is formed of a UV-curable pressure-sensitive adhesive containing a polymer composed mainly of an acrylic monomer polymerizable compound, the pressure-sensitive adhesive force of a surface of the pressure-sensitive adhesive layer to be stuck to the front surface of the semiconductor wafer is larger than the pressure-sensitive adhesive force of the opposite surface thereof, and the pressure-sensitive adhesive layer has an initial elastic modulus of from 0.01 MPa to 500 MPa.

Substrate-less pressure-sensitive adhesive sheet for protection of semiconductor wafer, method for grinding back side of semiconductor wafer using pressure-sensitive adhesive sheet, and method for producing pressure-sensitive adhesive sheet

An adhesive sheet for processing semiconductor substrates comprises a UV rays- and/or radiation-transmittable base film and an adhesive layer that undergoes a polymerization curing reaction by means of UV rays and/or radiation, wherein the adhesive layer is formed using a multifunctional acrylate oligomer and/or monomer having a double bond, and is blended so as to result in 1 double bond per total average molecular weight of 225 to 8000 as determined on the basis of the weight average molecular weight of the multifunctional acrylate oligomer and/or monomer.

Adhesive sheet for processing semiconductor substrates

The present invention relates to a pressure-sensitive adhesive sheet for processing a semiconductor wafer or semiconductor substrate, which includes a base material and a pressure-sensitive adhesive layer which is polymerizable and curable by an energy ray, the pressure-sensitive adhesive layer being disposed on a surface of the base material, in which the pressure-sensitive adhesive layer includes a base polymer, a multifunctional acrylate-based oligomer which has an energy-ray polymerizable carbon-carbon double bond and has a molecular weight of 1000 to 2500, and a multifunctional acrylate-based compound which has an energy-ray polymerizable carbon-carbon double bond and has a molecular weight of 200 to 700. The pressure-sensitive adhesive sheet of the invention is excellent in follow-up properties to a minute unevenness with a depth of about 0.4 to 40 &#x3bc;m such as a mark printed by laser irradiation, exhibits sufficient adhesive force, and can be released without the generation of adhesive residue after the purpose of adhesion has been achieved.

Pressure-sensitive adhesive sheet for processing semiconductor wafer or semiconductor substrate

A wired circuit board having a terminal portion formed as a flying lead that can provide enhanced strength of the conductive pattern, both sides of which are exposed, by simple construction to effectively prevent disconnection of the conductive pattern. The wired circuit board having the terminal portion formed as the flying lead in which the both sides of the conductive pattern are exposed includes, in crossing areas where ends of a cover-side opening and ends of a base-side opening and the conductive pattern are crossed each other, (i) the widened portions formed in the conductive pattern or (ii) cover-side projections and base-side projections formed in the cover layer and the base layer, respectively.

Wired circuit board

A nickel plating layer having a thickness within a range of 1.0 to 4.0 &mgr;m is formed in a terminal portion of a circuit board as an underlying plating layer. After a soldering bump is formed on the underlying plating layer, the soldering bump is connected to an external terminal formed in an external circuit.

Circuit board and connection structure of terminal portion of the same

Growing community of inventors

Ibaraki, Japan

Toshio Shintani