An ink composition including a cationically polymerizable compound having a styryl or .alpha.-methylstyryl group such as 4-methylstyrene and a photocationic polymerization initiator. The ink composition preferably further includes another cationically polymerizable compound having at least one group selected from oxirane and oxetane groups.

 
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> Cationic conductor, its intermediate, and lithium secondary battery using the conductor

> Image forming method
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