HYPERBRANCHED ESTER POLYMER, AND ELECTROPHOTOGRAPHIC TONER AND PIGMENT MASTER BATCH USING THE POLYMER

摘要

[PROBLEMS] To produce a hyperbranched polymer having excellent resin strength, a good anti-blocking property and less environmental dependence. [MEANS FOR SOLVING PROBLEMS] Disclosed is a hyperbranched ester polymer which is modified with a rosin. Preferably, the polymer has a number average molecular weight of 1000 to 60000, a hydroxyl value of 2 to 450 mgKOH/g, an acid value of 1 to 70 mgKOH/g, a glass transition temperature of 30°C or higher.