Toner compositions and use

摘要

A substantially chromium-free toner composition which comprises, as a negative charge control agent, one or more complexes of Formula 1: including other acceptable forms of such complex, in which: X+ is H+, Na+ or mixtures thereof; M is Fe or Co; R1 is sulphonyl or sulphamoyl, substituted by one or more C1-4 alkyl; and R2 is carboxy or phenylcarbamoyl, optionally substituted by one or more C1-4alkyl; but when R1 is methylsulphonyl, R2 is not carboxy.