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R&D Reports

vol. 1996 - I (1996.5.31 issue)

A Proposal for a New Design of Fertilization for Paddy-rice Including Application of "Sumishort", a Fertilizer Containing an Anti-lodging Agent.

Some rice cultivars which have high quality in taste like Koshihikari, have a tendency to lodge at the harvest season. These varieties require such fertilization as to prevent lodging. "Sumishort" is a new fertilizer containing "Uniconazole-P" as plant growth retardant developed by Sumitomo Chemical Co., Ltd.
Applied to rice plants at panicle formation stage, about 25 days before heading, "Sumishort" reduces the culm length which results not only in less lodging but also in more yield. The amount of fertilizer applied at this stage varies depending on cultivar, property of the soil and climate conditions of the field. To meet every possible environmental conditions, 5 types of "Sumishort" are prepared, for farmers choice.
In this report we show the summarized data of 229 field experiments at official and private stations throughout Japan except Hokkaido conducted between 1985 and 1992, and a new design of fertilization is proposed for cultivars with a tendency to lodge.
( by Seigo OUCHI, Akira NISHIKAWA, Shoji OKADA )

Development on Application of Super-Engineering Plastics

Super-engineering plastics have been widely used as advanced materials for electrical parts, automotive parts, and so on.
This report, forcusing on SUMIKASUPER LCP, SUMIKAEXCEL PES, and VICTREX PEEK, covers their marketing and technological potentials.
( by Hideo NOMURA, Satoshi NAGANO, Mitsuo MAEDA, Tohru NAGASHIMA, Kuniaki ASAI )

Characterization Techniques of Supermolecular Structures of Polymeric Materials by Electron Microscopy

The electron microscope investigation for studying the microstructures of polymeric materials has been improved by the innovation of instrument and sample preparation methods. Using these advanced methods, we can easily know the morphology of polymeric materials, elemental composition, the interface part between polymers in polymer alloy, and micromechanical processes etc. And recently, the new instrument, the scanning probe microscope, has been developed to measure the surface properties.
Now we descrived here mainly the technical application of electron microscopic methods using several data.
( by Shin-ya UTSUMI, Keitaro KOJIMA, Masaki NAKAJIMA )

Research of Synthetic Aroma Chemicals

In the 19th century, aroma chemicals were first synthesized by a chemical method. Since then, aroma chemicals have been widely used in various fields. Nowadays, they have become indispensable to our pleasant life.
This review describes an introduction to the aroma chemicals and a summary of the four aroma chemicals which have been developed in Sumitomo Chemical.
( by Shin TANAKA, Masahito SEKIGUCHI, Hiroshi SHIMIZU, Yasuhiko HIGASHIO )

New Organic Synthesis Utilizing a Computer

"What to make?" and "How to make?" are two big propositions in organic synthesis. The answer is "computer". Recent global trends of new organic synthesis utilizing a computer are serveyed along the R&D stages in organic synthesis as follows: 1) Information retrieval from electronic databases, 2) Computational chemistry including molecular design and synthesis-route design, 3) An automated system for organic synthesis including a robot, 4) Automatic elucidation of a molecular structure based on its spectroscopic data, and 5) Combinatorial chemistry which is a revolutional method for creation of a new drug. Several examples in our laboratory are also presented.
( by Iwao DOHGANE, Hiroshi SATO )

Construction of Recombinant Yeast Strains Expressing Human Cytochromes P450 and Their Application for Drug Metabolism Studies-PartII

Advance in molecular biology enables the expression of human P450s in heterologous hosts such as yeast and bacteria. Biotechnology and Environmental Health Science Laboratories of Sumitomo Chemical Co., Ltd. have constructed and basically evaluated recombinant yeast strains expressing human P450s. These series of recombinant yeast strains revealed the usefulness for the followings :

*enetic polymorphism and gene diagnosis of P450s,
*rediction of human metabolites and identification of the responsible P450 isozyme involved in the drug metabolism,
*rug-drug interaction,
*imic of human liver,
*nti human P450 antibody. In addition, we discuss metabolism and toxicology studies in the future from the standpoint of biochemistry and molecular biology.
( by Kunio SHIBA, Masayoshi MATSUI, Koichiro KOMAI, Hiromi YOSHINO, Koichi SAITO, Hideo KANEKO, Iwao NAKATSUKA )

Wafer Cleaning Technology Using High Purity Chemicals

High purity chemicals are always used in a cleaning process of the semiconductor manufacturing. Since the device integration techniques getting highly developed, the lower contamination is prefered to be acceptable. On the other hand, the wafer cleaning technology has been improved, which coincides with the technology development for the wafer surface evaluation. We successfully clarified the adhesion behavior of contaminants in a cleaning solution and the effects of device characteristics through the cleaning process.
In this paper, we describe the wafer cleaning technique using high purity chemicals. Especially, the behavior of metallic contamination and the particle removal process are discussed. Finally, we present our results of the prevention from contamination to wafers.
( by Masayuki TAKASHIMA, Kenichi SAWARA )

Influence of Scale-up Factors on Particle Size in Microcapsule Dispersion Process

As to manufacture of microcapsules containing bioactive compound such as pesticide, control of particle size, control of polymerization reaction, mixing condition of non-Newtonian viscous liquid and preventive measures against detorioration of particles must be taken into consideration from the viewpoint of design and operation of the dispersion process.
In this paper the influence of scale-up factors (chip speed of stirrer, We number, etc.) on the particles is specifically discussed with our experimental results based on the bench-scale test using a continuous disperser. In addition, deterioration of the particles caused by pump mixing is briefly described as well.
( by Kunitoshi TAKAHASHI )

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