Nitto-denko Corporation

Nitto Shinko Corporation

Hiroichi Ukei

Takehiro Ui

Hironobu Machinaga

Kazuto Yamagata

Yoshio Nakagawa

Yuuki Takeda

Kazuaki Sasa

Osamu Degawa

Yuya Kitagawa

Shinsuke Ikishima

Shuzo Fujiwara

Manabu Matsunaga

Tomoyuki Kasagi

Eri Ueda

Yoshihide Kawaguchi

Mizuki Yamamoto

Takio Itou

Masato Shirai

Masakazu Morimoto

Yasuyuki Kihara

Yuki Takeda

Atsushi Kuriu

Akira Tamai

Ryosuke Aoki

An electromagnetic wave absorber () includes a dielectric layer (), a resistive layer (), and an electrically conductive layer (). The resistive layer () is disposed on one principal surface of the dielectric layer (). The electrically conductive layer () is disposed on the other principal surface of the dielectric layer () and has a sheet resistance lower than a sheet resistance of the resistive layer (). The resistive layer () has a sheet resistance of 200 to 600&#x3a9;/&#x25a1;. When the resistive layer () is subjected to an immersion treatment in which the resistive layer () is immersed in a 5 weight % aqueous solution of NaOH for 5 minutes, an absolute value of a difference between a sheet resistance of the resistive layer () before the immersion treatment and a sheet resistance of the resistive layer () after the immersion treatment is less than 100&#x3a9;/&#x25a1;.

Electromagnetic wave absorber and electromagnetic wave absorber-attached molded article

An electromagnetic wave absorber () includes a dielectric layer (), a resistive layer (), and an electrically conductive layer (). The resistive layer () is disposed on one principal surface of the dielectric layer (). The electrically conductive layer () is disposed on the other principal surface of the dielectric layer () and has a sheet resistance lower than a sheet resistance of the resistive layer (). The resistive layer () is a layer that includes tin oxide or titanium oxide as a main component or a layer that is made of indium tin oxide including 40 weight % or more of tin oxide.

An electromagnetic wave absorber includes an electromagnetic wave-absorbing layer () and an adhesive layer (). The adhesive layer () is disposed on at least one surface of the electromagnetic wave-absorbing layer (). The electromagnetic wave absorber is capable of being adhered to a surface having a step in such a manner that the adhesive layer () is in contact with the surface. The adhesive layer () has a thickness equal to or greater than a reference height determined by subtracting 0.1 mm from the height of the step. In the electromagnetic wave absorber, a return loss &#x394;R defined by &#x394;R=Rt&#x2212;Rr is 15 dB or more. Rt is a reflection amount of a 76-GHz electromagnetic wave and is measured for a reference specimen. Rr is a reflection amount of a 76-GHz electromagnetic wave and is measured for a specimen obtained by adhering the electromagnetic wave absorber.

Electromagnetic wave absorber

An electromagnetic wave absorber (a) includes a first layer () and an electrically conductive layer (). The first layer () is a dielectric layer or a magnetic layer. The electrically conductive layer () is provided on at least one surface of the first layer. A product of a Young's modulus of the first layer () and a thickness of the first layer () is 0.1 to 1000 MPa&#xb7;mm. The first layer () has a relative permittivity of 1 to 10.

Electromagnetic wave absorber and molded article with electromagnetic wave absorber

The present invention provides an electrically insulating resin composition comprising a polysulfone resin including a plurality of sulfonyl groups in the molecule and a polyamide resin, wherein the proportion of the polyamide resin is 1 to 45% by mass. The present invention also provides a laminate sheet obtained by bonding a plurality of sheet materials with a resin composition layer interposed therebetween, wherein the resin composition layer comprises a polysulfone resin including a plurality of sulfonyl groups in the molecule and a polyamide resin, and the proportion of the polyamide resin is 1 to 45% by mass.

Electrically insulating resin composition and laminate sheet

An electromagnetic wave absorber () includes a resistive layer (), an electrically conductive layer () and a dielectric layer (). The electrically conductive layer () has a sheet resistance lower than a sheet resistance of the resistive layer (). The dielectric layer () is disposed between the resistive layer () and the electrically conductive layer (). The electromagnetic wave absorber () has a first slit (). The first slit () extends, in the resistive layer (), from a first principal surface () distal to the dielectric layer () toward the dielectric layer () in a direction perpendicular to the first principal surface () and divides the resistive layer () into a plurality of first blocks (). Each of the first blocks () has a minimum dimension (D) of 2 mm or more at the first principal surface ().

Electromagnetic wave absorber, article with electromagnetic wave absorber, and method for manufacturing electromagnetic wave absorber

For the purpose of providing an electromagnetic wave absorber usable for radar having a high revolution and sufficiently adaptable to a plurality of radars different in frequency, the bandwidth of a frequency band in which an electromagnetic wave absorption amount is not less than 20 dB is not less than 2 GHz, within a frequency band of 60 to 90 GHz.

A lamp reflector () includes a mirror surface () and a laminate (). The mirror surface () is a surface for reflecting light from a light source () to guide the light in a predetermined direction. The laminate () covers at least a part of the mirror surface () to absorb an electromagnetic wave having a specific frequency of 20 GHz to 90 GHz. The laminate () allows the light from the light source () to transmit therethrough toward the mirror surface ().

Lamp reflector and laminate for reflector

For the purpose of providing an electromagnetic wave absorber capable of holding excellent performance over a long period of time, the electromagnetic wave absorber includes: a dielectric layer B including a polymer film and having a first surface and a second surface; a resistive layer A formed on the first surface of the dielectric layer Band containing indium tin oxide as a main component; and an electrically conductive layer C formed on the second surface of the dielectric layer B and having a sheet resistance lower than that of the resistive layer A, wherein the indium tin oxide in the resistive layer A contains 20 to 40 wt. % of tin oxide based on the total weight of the indium tin oxide.

Electromagnetic wave absorber and molded article equipped with electromagnetic wave absorber

An electromagnetic wave absorber () includes: a first layer () being a dielectric layer or a magnetic layer; and a conductive layer () provided on at least one surface of the first layer (). The conductive layer () has a sheet resistance of 100&#x3a9;/&#x25a1; or less after the electromagnetic wave absorber () is exposed to an environment having a temperature of 85&#xb0; C. and a relative humidity of 85% for 1000 hours. The electromagnetic wave absorber () has a flexural rigidity of 7000 MPa&#xb7;mmor less.

A release liner formed of a polypropylene resin sheet that can be highly recyclable and that can provide an excellent performance in a wide range of operating temperature is provided. A release-lined pressure-sensitive adhesive (PSA) sheet constituted with the release liner is also provided. A release-lined PSA sheetaccording to the present invention comprises a PSA sheethaving a supportand a PSA layer; and a release linerplaced on the PSA layer. The release linerhas a layered configuration formed of a layer Aformed of a polypropylene resin composition containing a nucleating agent; and a layer Bformed of a polypropylene resin composition containing no nucleating agent; wherein the two layers stacked to form the thickness of the liner.

Pressure-sensitive adhesive sheet with release liner

A release liner formed of a highly recyclable polypropylene-based resin sheet and capable of assuring excellent operability over a wide range of environmental temperature is provided. A pressure-sensitive adhesive (PSA) sheet with release liner is also provided. A PSA sheet with release liner according to the present invention comprises a PSA sheet including a support and a PSA layer; and a release liner formed of a polypropylene-based resin sheet which is obtained by molding into a sheet a polypropylene-based resin composition containing a nucleating agent. The PSA sheet with release liner provides excellent operability even in a high temperature environment of, for example, about 35&#xb0; C. The PSA sheet with release liner is preferably applicable in an attachment operation wherein the PSA sheet is attached to an adherend while the liner is released from the PSA sheet.

Provided is a release-lined pressure-sensitive adhesive sheet comprising a release linerand a pressure-sensitive adhesive sheet. The release linerhas an average linear expansion coefficient of at most 7&#xd7;10/&#xb0; C. between 25&#xb0; C. and 40&#xb0; C. A layerto constitute a surfaceA on the pressure-sensitive adhesive layer side of the release lineris formed of a polyolefin-based resin composition containing none or at most 0.01 mass % of a phosphorous-based antioxidant. The surfaceA is divided into a plurality of sectionsby a plurality of ridgesA andB with each ridge having a height of 5 &#x3bc;m to 50 &#x3bc;m. At least one of the sectionsinscribes a circle of a diameter greater than 500 &#x3bc;m.

A steel plate reinforcing sheet includes a restricting layer and a reinforcing layer, the reinforcing layer being formed of foam composition including styrene synthetic rubber, aromatic epoxy resin, and a foaming agent. A total thickness of the restricting layer and reinforcing layer is not more than 3.5 mm, and the steel plate reinforcing sheet is formed to have adhesion at 5&#xb0; C. to an oiled, cold-rolled steel plate of not less than 2.0N/25 mm and also has bending strength of not less than 18N after being heated at 160&#xb0; C. for twenty minutes. This ensures both sufficient adhesion to the steel plate and sufficient reinforcement of the same steel plate. Thus, this steel plate reinforcing plate, when adhesively bonded to a steel plate used in a variety of industrial machines properly and then foamed, can provide an effective reinforcement of the steel plate by forming the steel reinforcing plate bonded to the steel plate.

Steel plate reinforcing sheet

A pressure-sensitive adhesive tape which comprises a resin film and a pressure-sensitive adhesive layer formed on at least one side of the film, and which has a concave-convex form containing plural grooves arranged at given intervals in a face of the pressure-sensitive adhesive layer that is to be stuck onto an adherend, and has a region where the interval of the arrangement of the grooves is 400 &#x3bc;m or more, the tensile modulus of the pressure-sensitive adhesive tape in the temperature range of 23 to 80&#xb0; C. being in the range of 30 to 600 MPa. This tape has such an excellent workability that when the tape is stuck onto an adherend, air bubbles escape easily therefrom so as to prevent the generation of defects based on the entrainment of the air bubbles.

Growing community of inventors

Ibaraki, Japan

Hiroichi Ukei