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R&D Reports

vol. 2006 - II (2006.11.30 issue)

Development of ‘Olyset® net’ as a Tool for Malaria Control

Olyset® net is composed of a resin-based fiber that incorporates a synthetic pyrethroid called permethrin to form a mosquito net for malaria vector control. The most important characteristic of Olyset® net is a dynamic release behavior for the permethrin in the fiber. Though a washing removes part of the permethrin from the surface of the net, the permethrin migrates from the inside of the fibers to the surface and maintains its efficacy against mosquitoes. In addition, since the fiber itself is tough, the efficacy of an Olyset® net lasts and the net itself can be kept for at least 5 years in Africa.
( 4-11 by Takaaki ITO,Takeshi OKUNO )

Characteristics and Applications of Sumitomo® Easy Processing Polyethylene

Polyethylene (PE) is one of the commodity plastics that is widely used in films, foams, containers, pipe and so on. Polyethylene that is manufactured by the metallocene catalyst system (m-PE) and has a narrow molecular structural distribution has been penetrating the market mainly because of its high mechanical strength. On the other hand, this m-PE generally exhibits poor processability, so R&D has recently been focused on the development of m-PE with good processability. Sumitomo Chemical has succeeded in the development of a new type Easy Processing Polyethylene (EPPE) that exhibits a good balance of processability and toughness. The main features of EPPE are easy processability similar to that of the high pressure-low density polyethylene (HP-LDPE) and considerably high mechanical strength. These features are mainly the result of its unique molecular structure based on long chain blanching. EPPE can be processed at low temperatures or under high output conditions because EPPE has a low kneading torque and high melt tension. In this review, we will introduce the viscoelastic features of EPPE and some applications such as high quality film, energy saving processing and high productivity based on its easy processability.
( 12-19 by Kenzo CHIKANARI,Tatsuhiro NAGAMATSU )

Discovery and Development of a Novel Insecticide "Clothianidin"

Clothianidin is a novel neonicotinoid insecticide with thiazol ring which has been developed and commercialized by Sumitomo Chemical Takeda Agro Company, Ltd. The characteristics of neonicotinoids include a good systemic action and high activities against sucking insect pests such as hemiptera and thysanoptera. Clothianidin is effective even against diptera, coleoptera and lepidoptera pests and can be applied by a wide variety of treating methods. This report describes development details, biological activities, safety and synthetic methods of clothianidin.
( 20-33 by Hideki UNEME,Masato KONOBE,Atsuo AKAYAMA,Tokunori YOKOTA,Koji MIZUTA )

Recent Trend on Nondestructive Material Testing Method and Its Application to Chemical Plant Equipment

Newly developed methods for facility management like RBI (Risk Based Inspection) and FFS (Fitness For Service) have recently been adopted in industrial chemical plants for the purpose of enhancing safe, stable operation and extending their operational lives. These new methods introduced in this paper include an inspection method for stress corrosion cracks, an inspection method for parts with elevated temperatures during operation, an inspection method for reactor tubes under the baffle plates of carbon steel reactors, and diagnostic technology for ball bearings developed through collaboration between academia and industry on research. Non-destructive inspection technologies, which are very applicable to the protection of rotating machines from contamination by foreign objects are also introduced in this paper.
( 34-43 by Hisakazu MORI,Hidehiko SUETSUGU )

Determination of Substances of Concern Regulated in EU

In recent years, advanced regulations concerning restrictions on the use of hazardous substances have been enforced in the EU, as environmental pollution control acts. Subsequent to the ELV for automobiles, restrictions on the use of hazardous substances are being examined for the field of electric and electronic equipment, where both WEEE and RoHS directives have been enacted. In the ELV, the use of four heavy metals (Cadmium, Lead, Mercury, Chromium) has been restricted. The use of the same heavy metals as in the ELV, as well as two additional flame retardants (Polybrominated biphenyl, Polybrominated diphenyl ether) has been restricted in RoHS. Under these circumstances, the control of certain hazardous substances in products takes on great importance. This paper describes the use of various analytical equipment in screening analysis by XRF and precision analysis for Cd, Pb, Hg, Cr, Br.
( 44-51 by Hiromu OGASAWARA,Kei TANAKA,Shuichiro MANABE )

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