Patent ID: 8716513

Claim:
A method for producing a bis-quaternary ammonium salt represented by a formula (3), which comprises reacting a disulfonic acid ester represented by a formula (1) with a tertiary amine represented by a formula (2): wherein R 1 represents an alkyl group, which may have at least one substituent, a haloalkyl group, a heteroatom-containing alkyl group, which may have at least one substituent, a phenyl group, which may have at least one substituent selected from the group consisting of halogen and a C 1 -C 3 fluoroalkyl group independently, an aralkyl group, which may have at least one substituent, a heterocyclic group, which may have at least one substituent, or an unsaturated hydrocarbon group, and T represents a C 1 -C 3 alkylene chain, wherein R 3 to R 5 represent independently an alkyl group or a heteroatom-containing alkyl group, R 3 and R 4 or R 3 to R 5 and nitrogen bonding thereto may form a heterocycle, and wherein R 1 , R 3 to R 5 , and T are the same as the above.