JAPAN SYNTHETIC RUBBER

Jptt Kokai Tokkyo Koho JP 60 108,447 (fune 13,1985), (to Japan Synthetic Rubber Co., Ltd.). 

Japan Synthetic Rubber Co. noncross-bnked melt flow iadex, 150°C, 2.160 is 3 g/10 min for all grades. 

Currentiy, i7j -l,4-polyisoprene is manufactured in the United States only by The Goodyear Tire Rubber Co. at Beaumont, Texas. In Western Europe, only the Shell Nederland Chemie (Royal Dutch/SheU Group) commercially produces i7j -l,4-polyisoprene in Japan, the producers are Japan Synthetic Rubber Co., Ltd. and Nippon Zeon Co., Ltd. The sole world producer of /n j -l,4-polyisoprene is Kuraray Co., Ltd. in Japan. 

As with polybut-l-ene and many other vinyl monomers that contain an asymmetric carbon, isotactic, syndiotactic and atactic stmctures may be drawn. Using co-ordination catalysts such as mixtures of cobalt chlorides, aluminium alkyls, pyridine and water high-1,2 (high vinyl) polymers may be obtained. One product marketed by the Japan Synthetic Rubber Company (JSR 1,2 PBD) is 91% 1,2, and 51-66% of the 1,2 units are in the syndiotactic state. The molecular mass is said to be several hundred thousand and the ratio MJM is in the range 1.7-2.6. 

Source Reprinted with permission from Japan Synthetic Rubber Co. Ltd. 

Japan Synthetic Rubber, Japan Kokai 75/22,100 (1975) Chem. Abstr. 83, 44047 (1975). 

The authors would like to express grateful acknowledgment to Japan Synthetic Rubber Co., for the photosensitivity evaluation of the pyrimidine polymers. 

K. Fukuma, T. Akagj, ami K. Kitai for their cooperation in experimental work. Japan Synthetic Rubber Company supplied the rubber samples used, and Mitsubishi-Monsanto Chemicals Company supported part of this research, to which their thanks are also due. 

Arton Japan Synthetic Rubber Cyclic olefin copolymer... 

Octadecyl-3-(3, 5 -di-ferf-butyl-4 -hydroxyphenyl) propionate (23) JSR BR-01 Japan Synthetic Rubber... 

BROI, Japan Synthetic Rubber BROI, Japan Synthetic Rubber Cis BR 1203, Phillips Petroleum Co. 

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