NOVEL POLYHYDROXYALKANOATE PRODUCING METHOD THEREFOR CHARGE CONTROL AGENT CONTAINING SUCH POLYHYDROXYALKANOATE TONER CONTATINING SUCH CHARGE CONTROL AGENT AND IMAGE-FORMING METHOD AND IMAGE-FORMING APPARATUS UTILIZING SUCH TONER

摘要

PURPOSE: A novel polyhydroxyalkanoate, its preparation method, a charge controlling agent, a toner binder and a toner containing the polyhydroxyalkanoate, and an image formation method and apparatus are provided, wherein the charge controlling agent shows an excellent charging characteristics, excellent dispersibility in a toner resin and the improved spent property and is biodegradable. CONSTITUTION: The polyhydroxyalkanoate comprises at least one unit represented by the formulas 1, 2, 7 and 8, wherein x is an integer of 0-8. Preferably the polyhydroxyalkanoate has a number average molecular weight of 1,000-500,000. The preparation method comprises the steps of culturing microorganism in a medium containing at least one ¥ø -(2-thienylsulfanyl)alkanoic acid represented by the formula 27; and treating the produced polyhydroxyalkanoate with sodium hypochlorite.