TONER FOR DEVELOPING ELECTROSTATIC CHARGE IMAGE

摘要

PROBLEM TO BE SOLVED: To obtain a biodegradable toner having a fixing property a low fixing temp. and excellent in low-temp. fixability, anti-offsetting property) and blocking resistance by incorporating specified polyester resin and a colorant. SOLUTION: This toner contains a colorant and polyester resin obtd. by bringing a compsn. contg. lactic acid and ter- or higher functional oxycarboxylic acid preferably in a weight ratio of 80:20 to 99.9:0.1 into dehydration polycondensation. Optical isomers preferably account for at least 5mol% of the entire lactic acid monomer. The oxycarboxylic acid is preferably aliphatic oxycarboxylic acid, especially tartaric acid or citric acid and the pref. amt. of the oxycarboxylic acid is 0.1-20wt.%.