Otsuka Chemical Co., Ltd.

Hiroaki Shima

Akihiro Nabeshima

Akinori Oka

Shoji Hiketa

Masatoshi Uetani

Yoshinobu Abe

Yoshinobui Abe

An additive of the formula (1) for use in electrolytic solutions wherein A is &#x2014;CH(X)&#x2014; or &#x2014;C&#x2550;C(X)&#x2014;, X being hydrogen, halogen, alkyl having 1 to 4 carbon atoms, alkoxycarbonyl having 2 to 5 carbon atoms, benzoyl or alkoxycarbonylalkyl having 3 to 9 carbon atoms, Qand Qare the same or different and are each alkyl having 1 to 6 carbon atoms, alkoxyl having 1 to 4 carbon atoms, alkoxycarbonylalkyl having 3 to 9 carbon atoms or amino having as a substituent alkyl having 1 to 4 carbon atoms, and A, Qand Qmay form a ring structure.

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Tokushima, Japan

Hiroaki Shima