Mitsui Petrochemical Industries, Ltd.

Ryosuke Tomita

Toshihiro Sagane

Kinya Mizui

Shuji Minami

Shigemi Shiraki

Masami Takeda

Hideaki Yamaguchi

Masayuki Okabe

Kenji Wakatsuru

Yoshimi Ozaki

Takehiko Kawate

In accordance with the present invention, there are provided cycloolefin random copolymers composed of ethylene and cycloolefin and containing substantially no polyethylene, and processes for preparing the same. Optical disc substrates prepared from the above-mentioned copolymers are excellent in transparency and also capable of minimizing the occurence of errors in reading of the discs due to quality of the substrates used therefor.

Cycloolefin random copolymer and process for preparing same

An aromatic hydrocarbon in which at least one hydrogen atom on the ring is substituted by a group selected from the class consisting of unsubstituted or lower alkyl-substituted tricyclo[5.2.1.0.sup.2,6 ]dec-3-yl, tricyclo[5.2.1.0.sup.2,6 ]dec-4-yl, tetracyclo[6.2.1.1.sup.3,6.0.sup.2,7 ]dodec-4-yl and tetracyclo[6.2.1.1.sup.3,6.0.sup.2,7 ]dodec-5-yl groups, or its hydrogenation product. The compound is prepared by reacting an aromatic hydrocarbon having at least one hydrogen atom on the ring with a compound selected from the group consisting of unsubstituted or lower alkyl-substituted tricyclo[5.2.1.0.sup.2,6 ]dec-3-ene and tetracyclo[6.2.1.1.sup.3,6.0.sup.2,7 ]dodec-4-ene in the presence of a Friedel-Crafts catalyst, or hydrogenating the thus-obtained compound in the presence of a hydrogenation catalyst. The compound is useful as an additive for adhesives.

Novel substituted aromatic hydrocarbons, processes for production

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Yamaguchi, Japan

Ryosuke Tomita