US Patent 7718826 Ionic compound

This invention relates to a novel ionic compound being low in a risk of combustion, and more particularly to an ionic compound represented by the following formula (I):(NPR12)n   (I)[wherein R1s are each independently a halogen element or a monovalent substituent, provided that at least one of R1s is an ionic substituent represented by the following general formula (II):—N+R23X−  (II)(wherein R2s are independently a monovalent substituent or hydrogen, provided that at least one of R2s is not hydrogen and R2s may be bonded with each other to form a ring; and X− is a monovalent anion); and n is 3 to 15].