Asahi Glass Japanese

In Japan, the primary suppHers are Asahi Glass Co., Ltd. (60,000 t), Daikin Industries, Ltd. (115,000 t), and Du Pont-Mitsui Pluorochemicals Co. (64,000 t). Together these three producers account for over 90% of the Japanese CPC production. 

The author thanks Professor S. Ogawa, Drs. K. Tadano, T. Toyokuni, and N. Chida for their faithful collaboration in this research. The financial support of the work by the Grant-in-Aid for Scientific Research from the Japanese Ministry of Education, Science- and Culture, and by the Asahi Glass Foundation for Industrial Technology is gratefully acknowledged. 

Yamada, Y. Morimoto, T. Japanese Patent 89-41859 890223 Asahi Glass Co., Ltd., Japan, Jpn. Kokai Tokkyo Koho, 1989. 

Asahi Glass (1981) Japanese Patent 81,49,348 of 02.05.81 (Chem Abst 95 97103h)... 

The author wishes to express his sincere appreciation to Professor Herbert C. Brown of Purdue University, who kindly introduced him to this interesting and attractive field of chemistry. The author is indebted to his active and sedulous co-workers whose names appear in the references, and to the generous support given by the Ministry of Education of Japan, the Japanese Society for the Promotion of Science, Asahi Glass Foundation for Industrial Technology, Mitsubishi Chemical Industries, Mitsui Petrochemical Industries, and Phillips Petroleum Co. 

T. Morimoto, N. Yoshida (Asahi Glass Co.), Japanese Patent 89-84 648 (1989) Chem. Abstr. 114, 232041q (1991). 

The catalyst systems employed are based on molybdenum and phosphorus. They also contain Various additives (oxides of bismuth, antimony, thorium, chromium, copper, zirconium, etc.) and occur in the form of complex phosphomolybdates, or preferably heteropolyacids deposited on an inert support (silicon carbide, a-alumina, diatomaceous earths, titanium dioxide, etc.). This makes them quite different from the catalysts used to produce acrylic acid, which do not offer sufficient activity in this case. With residence times of 2 to 5 s, once-through conversion is better than 90 to 95 per cent, and the molar yield of methacrylic acid is up to 85 to 90 per cent The main by-products formed are acetic add, acetone, acrylic add, CO, C02, etc. The major developments in this area were conducted by Asahi Glass, Daicel, Japan Catalytic Chemical, Japanese Gem, Mitsubishi Rayon, Nippon Kayaku, Standard Oil, Sumitomo Chemical, Toyo Soda, Ube, etc. A number of liquid phase processes, operating at about 30°C, in die presence of a catalyst based on silver or cobalt in alkaline medium, have been developed by ARCO (Atlantic Richfield Co,), Asahi, Sumitomo, Union Carbide, etc. 

Historically, the Japanese chlor-alkali industry started in 1881, when the LeBlanc process was used to produce caustic soda. Osaka Soda and Hodogaya Chemical commercialized the mercury- and diaphragm-cell technologies in 1915. Asahi Glass started the Solvay process soon after. By 1973, 95% of the chlorine was produced by the mercury-cell process and 5% by diaphragm cells. In 1973, mercury pollution issues... 

Some polymers are far more difficult to recycle than other. In this category are fluorinated resins where the problem is the gas generated when the polymer thermally decomposes. However a joint venture between the two Japanese companies, Asahi Glass Co. Ltd. and Nittetsu Chemical Engineering Ltd., has developed the necessary technology to carry out recycling. 

Taneda N., Matsuzaki K., Arai T., Mnkoyama T., Ikemnra M. Properties of silica fibers prepared by sol-gel method. Asahi-Glass Res. Rep. 1988 38 309-318 (in Japanese)... 

Yoneda T., Morimoto T, Hiroya M., Endo E. Coating film having photocatalyst activity and composition forming the coating film. Asahi Glass Co. Ltd., Japanese Published Patent Application No. H9-328336 (1998)... 

Asahi Glass Co. (1982). Corrosion Protection in Flaked Calcium Chloride Production. Japanese Patent... 

Typical standard PC brands include Calibre from Dow, Lexan from GE Plastics, Makrolon from Bayer, and Xantar from DSM. Glass fibre reinforcement may be incorporated to improve rigidity and, to this end, it has been reported that the Japanese Asahi Fiber Glass Co. Ltd., has developed a special glass fibre to produce a compound which combines transparency with a low coefficient of expansion. Applications include personal computer and other housings as infrared sensor, transparent display covers. 

---