Nippon Petrochemicals Company, Limited

Saisuke Watanabe

Kazuharu Suyama

Teppei Tsujimoto

Shuichi Tajima

A bicyclic conjugated diene polymer obtained by polymerizing a monomer (M) comprising at least one kind of bicyclic conjugated diene monomer represented by formula (I), and a bicyclic conjugated diene copolymer obtained by copolymerizing monomer (M) with at least one kind of unsaturated compound other than said monomer:wherein, Rto Rare the same or different and are each hydrogen, halogen, or alkyl or halogenated alkyl of 1 to 20 carbon; n and m are each an integer of from 0 to 10; X, X, Yand Yare the same or different from each other and are each hydrogen, halogen or alkyl or halogenated alkyl of 1 to 20 carbon; and, when m or n is 2 or more, each of mX's, mX's, nY's and nY's are the same or different.

Bicyclic conjugated diene polymer and bicyclic conjugated diene copolymer

Adipic acid diester is caused to react with alkoxide M(OR) , wherein R is an alkyl group and M is an alkali metal or alkaline earth metal, the reaction product is successively subjected either to coupling with halomethylstyrene followed by carbonylation, or to coupling with 2-(halomethylphenyl)propionic acid or its ester followed by decarboxylation and hydrolysis. With this process, it is possible to produce more efficiently a specific 2-substituted propionic acid, loxoprofen.

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Atsugi, Japan

Saisuke Watanabe