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Dive into the research topics where Hiromi Ito is active.

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Featured researches published by Hiromi Ito.


Polymer | 2000

Improvement of thermal and mechanical properties by control of morphologies in PES-modified epoxy resins

Kenji Mimura; Hiromi Ito; Hirofumi Fujioka

Abstract In order to improve both the heat resistance and the toughness of cured epoxy resins, polyethersulfone (PES) was added to a biphenyl-type epoxy resin. The dispersion state of the PES in the epoxy resin was controlled by changing the molding temperature, and the effect of the morphologies on the heat resistance and toughness of the cured resins was investigated. In the resin with a homogeneous phase morphology, the glass transition temperature (Tg) of the resin containing 10xa0wt% PES increased about 20°C, and the value of the fracture toughness also increased about 60% more than that of the unmodified resin. This is attributed to the formation of the semi-interpenetrating polymer networks (semi-IPNs) composed of the epoxy network and linear PES. On the resin with phase separation structure, a significant increase in toughness was obtained only when the PES formed a continuous phase morphology. However, higher PES content is required to form the co-continuous phase morphology, which causes the increase in the viscosity of the resin. In addition, the Tg of this system was equal to or only slightly higher than that of the unmodified resin.


Archive | 1988

Epoxy resin composition for sealing semiconductor

Hiromi Ito; Ichiro Takahashi; Hirozoh Kanegae


Archive | 2006

Thermally conductive resin sheet and power module using the same

Hiromi Ito; Osamu Yashiro


Archive | 1996

Molded products for high voltage apparatus comprising brominated epoxy resins

Hiromi Ito; Takumi Kikuchi; Hirofumi Fujioka; Hirozoh Kanegae; Yoshifumi Itabashi; Fumio Nogami


Archive | 1997

Epoxy resin composition for molding having improved mechanical properties and crack resistance

Hiromi Ito; Takumi Kikuchi; Hirofumi Fujioka; Hirozoh Kanegae; Yoshifumi Itabashi; Fumio Nogami


Archive | 2006

Insulating sheet and method for producing it, and power module comprising the insulating sheet

Hiromi Ito; Naoshi Yamada; Kei Yamamoto; Hirofumi Fujioka; Takumi Kikuchi; Osamu Yashiro


Archive | 1992

Flexibilizers of hydroxyphenyl silicone oil-epoxy resin product and epoxy silicone oil-phenol resin product

Hiromi Ito; Ichiro Takahashi


Archive | 1989

Epoxy resin containing an epoxy resin-modified silicone oil flexibilizer

Hiromi Ito; Ichiro Takahashi


Archive | 1996

Insulating spacer with shield electrodes having a graded resistance

Hiromi Ito; Kenji Mimura; Hirofumi Fujioka; Etsuro Tomonaga; Hiroshi Aoki; Hiroyuki Hama


Archive | 1993

Epoxy resin composition for sealing semiconductor and semiconductor device utilizing the same

Hirofumi Fujioka; Hiromi Ito; Yuzo Kanegae; Masakazu Murayama; 浩美 伊藤; 雅一 村山; 弘文 藤岡; 裕三 鐘ケ江

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