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R&D Reports

vol. 1995 - I (1995.5.30 issue)

Resource® A New Herbicide

Resource® (flumichlorac pentyl ester, S-23031, pentyl 2-chloro-4- fluoro-5- [(3,4,5,6-tetrahydro) phthalimido] phenoxyacetate) is new post-emergence herbicide for use in soybeans and corn. Resource® is applied for controlling some important broad-leaved weeds, especially velvetleaf (Abutilon theophrasti Medik.) at extremely low use rates and it shows excellent tank-mix compatibility with other soybeans or corn herbicides such as Pursuit®, Select®, atrazine and Accent®. Resource® has no potential risks for the environments and human health and it is the first new crop use pesticide approved by the EPA under their reduced risk policy. Resource® has been registered in November 1994 as a soybeans and corn herbicide in the U.S.A.
( by Shunichi Hashimoto, Eiki Nagano, Toshiro Otsubo, Kenji Nambu, Shunji Hosokawa, Ichiki Takemoto )

Why Zeolite now?- Acidity Control and Catalysis of Pentasil Zeolites. -

The following three vapor-phase reactions were examined over pentasil zeolites, and the results were considered from the view point of acidity control: 1) para-selective dealkylation of cymenes over MgO/Li-ZSM-5, 2) Beckmann rearrangement of cyclohexanone oxime over the extremely highly silicious pentasil zeolite (having no acidity) treated with trimethylchlorosilane (TMCS), and 3) synthesis pyridines over Pb (or TI) - ZSM-5. For the Beckmann rearrangement, the active site was elucidated to be a neutral silanol group on the external surface of zeolite. Furthermore, the recent advances of zeolite chemistry have been surveyed.
( by Hiroshi Sato, Masaru Kitamura, Ken-ichi Hirose, Norio Ishii )

Light-Emitting Diode Utilizing Conjugated Polymer

We have successfully prepared polymer light-emitting diodes, LEDs, utilizing poly(arylene vinylenes) as a light emitting material. Numbers of poly(arylene vinylenes), PAVs were synthesized and analyzed. We found that the substitution of long side chain led to improving the efficiency of fluorescence of PAV and that an alternating copolymer of p-phenylene vinylene and 2,5-dialkoxy-p-phenylene vinylene showed higher efficiency of fluorescence than that of homopolymer of each monomer unit. Using the highly fluorescent polymer, a maximum luminance of 70,000cd/m2 and a long life time of about 1,000hours were achieved. In this paper, the recent progress and prospect of polymer LEDs utilizing various kinds of PAV are described.
( by Toshihiro Ohnishi, Takanobu Noguchi, Shuji Doi )

Development of Resins for Printed Wiring Board -Low Dielectric Resins-

Corresponding to the remarkable development of the electronic devices, the printed wiring board possessing low dielectric constant and low dissipation factor is required for high-speed processing and the use of high frequency. The selection of matrix resin is an important factor for getting the low dielectric printed wiring board. We developed new epoxy resins "Sumi®-epoxy LDX series" and cyanate resins possessing low dielectric constant and low dissipation factor by using our synthetic technology of epoxy resins and molecular designing by computer chemistry.
( by Mitsuhiro Shibata, Youichi Ueda, Hisashi Watabu, Yasuhiro Endou, Kaori Yamasaki, Toshiaki Hayashi )

High Purity Aluminum Cryostatic Stabilizer for SMES

In Superconducting Magnetic Energy Storage(SMES), an electric power is directly stored in the form of electricity. As an electric power storage, we greatly expect its excellent efficiency, high power, rapid response and distinguished reliability. In order to realize this power storage, a large amount of high purity aluminum is expected to be used as the cryostatic stabilizer to protect the superconductor from the destruction caused by "Quenching". As one of the largest high purity aluminum suppliers in the world, we review the status of the SMES development, especially its conductor design. Also, our newly developed high purity aluminum for the cryostatic stabilizer is demonstrated.
( by Akihiko Takahashi, Hitoshi Yasuda )

Stable Transformation of Soybean by Bombardment with DNA -Coated Microprojectiles

High concentration of the phytohormone 2,4-D induces somatic embryos on immature soybean seed. They are capable of proliferation and regenerating to mature plants, and are suitable target for gene transfer experiments. We established an efficient transformation method for soybean using particle gun, which is a device to deliver DNA-coated gold particles (up to 1 micron m) to plant cells by air-pressure power. In this system, a constructed plasmid pSUM-GH containing both GUS reporter gene and hygromycin resistant gene as a selectable marker was bombarded on somatic embryos. Selected hygromycin resistant embryos showed strong GUS activity and regenerated to transgenic plants. In order to apply this transformation system to modify soybean seed quality, we constructed a seed-specific expression vector pSUM-GY1. The GUS gene cloned into the vector exhibited high level of expression in developing seed but neither in leaves nor in germinating seed. This vector will be a powerful tool to alter agronomic characteristics of soybean.
( by Kenji Oeda, Akitsu Nagasawa, Asako Iida, Eijiro Watanabe )

Low Pressure Injection Molding Technology -Gas Assisted Injection Molding-

Gas-Injection molding is one of the low pressure injection moldings. This process forms hollow core with highly pressurized nitrogen gas filling in melted polymer and has the potential to produce rigid parts with better surface finish which has no sinkmark and warpage than conventional injection molding. In this paper the outline of low pressure injection molding and gas-assisted injection molding including the principles, the special features, processes, application examples, parts and mold design technics using CAE are introduced.
( by Yoshiaki Togawa, Kenichi Higashi, Masaaki Tsutsubuchi, Tsuyoshi Kayanoki, Moriyasu Shimojo )

Chiral Separation by Chromatography -Recent Progress and Future Trends-

Many of bioactive molecules are chiral and enantioselective analytical methods are essential for characterizing their biological and physicochemical properties. Chiral separation by high-performance liquid chromatography without prior derivatization, using chiral stationary phases has played a large role in these fields. In this review, our work on various chiral stationary phases is described. Additionally, chiral separations with micellar electrokinetic chromatography and supercritical fluid chromatography, which are highly efficient separation techniques, are demonstrated.
( by Ritsuko Furuta, Masahiko Okamoto, Ken-ichi Takahashi, Tadashi doi )

The Outlines and Applications of DIERS Methodology to Design Emergency Relief Systems for Runaway Reactions

When emergency relief systems for runaway reactions are designed, the occurrence of two phase vapor-liquid flow must be taken into consideration. Generally, in case of two phase flow, larger relief areas are necessary in comparison with all vapor flow. In this review, the outlines of DIERS Users Group which is the subordinate organization of AIChE are presented. Then, the bench-scale calorimeteres and the simplified vent sizing equations based on homogeneous mixture which are developed by DIERS are explained together with the applicative examples.
( by Takeshi Kikuchi )

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