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R&D Reports

vol. 1999 - I (1999.5.25 issue)

Environmentally Friendly Reactive Dye "Sumifix HF"

Recently, needs for environmentally friendly textiles are increasing in order to protect the earth environment. So dyeing industry demands ecological dyes to produce environmentally friendly textiles. Reactive dyes occupy an important position for dyeing cellulosic fibers. However, reactive dyes require much amount of salt in dyeing and the fixation yield is lower than that of other kinds of dyes. So the effluence of reactive dyeing involves much amount of salt and colored discharge which pose environmental questions. And then the reactive dyes having high fixation yield with lower salt have been needed. Last year, we released "Sumifix HF", a reactive dye with very low salt requirements and high fixation yield. This paper highlights the development and the performance of "Sumifix HF".
( by Tetsuya MIYAMOTO, Jyun-ichi SEKIHACHI, Takeshi WASHIMI )

Lano® Tape -A Novel Formulation for Whitefly Control-

Lano® Tape is a new type of pesticide formulation containing 1g/m2 of pyriproxyfen as an active ingredient and was developed by Sumitomo Chemical Co., Ltd.for whitefly control in greenhouse. Lano® Tape placed near crops attracts the adults of whiteflies to the Tape by its yellow color then transfer the active ingredient to them.This means that it controls whiteflies without sprayng the active ingredient. This formulation has advantages of labor-saving,long-term excellent control and usefulness in integrated pest management (IPM) programs. The present report describes the development of Lano® Tape by focusing on its design of formulation, physico-chemical properties, application methods and efficacies.
( by Masao INOUE, Satoshi NAKAMURA )

Pyridine Bases and Their Synthetic Methods

Pyridine bases are widely used in pharmaceuticals, insecticides, and herbicides due to their high bioactivity. In this paper, some typical synthetic methods for pyridine bases, recent advances of catalysts having a shape selectivity of pentasil zeolite (ZSM-5) with a similar pore diameter to pyridine ring, and some considerations on their catalysis are described.
( by Nobuyuki ABE )

Recent Developments of Homogeneous Catalyst Systems for Olefin Polymerization

Since the discovery of highly active homogeneous catalyst systems based on metallocene and methylalumoxane,many studies have been made from the point of view of both scientific interest and industrial use. This review describes mainly a recent progress in the studies of olefin polymerization with metallocene catalyst systems and stereoregulation mechanisms of the propylene polymerization. Novel non-metallocene catalysts and new polymer synthesis with such catalysts are also described.
( by Tatsuya MIYATAKE, Akio IMAI )

New Synthetic Methods of Aromatic Sulfur Compounds

Needs for aromatic sulfur compounds are increasing for use in highly functional materials such as pharmaceuticals, agricultural chemicals, materials with high-refractive index, anti-oxidants and the like.
On the other hand, concerning the synthetic techniques of the aromatic sulfur compounds, conventional methods have been lacking in general-purpose use, because each compound was manufactured by a specific method different from the others.
The present technique relates to the development of new widely-used synthetic methods of high-functional aromatic sulfur compounds basically comprising two processes of "Introduction of thioalkyl group and cleavage of thio-alkyl bond", using an alkylmercaptan as a sulfur source.
( by Hiroshi GODA, Hirokazu KAGANO )

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