NEW POLYHYDROXYALKANOATE HAVING AMIDE, SULFONIC ACID, AND SULFONIC ACID ESTER GROUPS, ITS PRODUCTION METHOD, CHARGE REGULATOR, TONER, IMAGE FORMING METHOD, AND IMAGE FORMING DEVICE

摘要

PPROBLEM TO BE SOLVED: To provide a novel polyester which has charge stability, high net charge, improved dispersibility, and biodegradability, and is suitable for use in a toner charge regulator in an electrophotographic process; a method for producing the same; and a technique for applying the same. PSOLUTION: The PHA (polyhydroxyalkanoate) comprises at least one unit represented by formula (1) in the molecule:(1) wherein R is -ASB1/SBor -(SOSB2/SBRSB1/SB)SBx/SB, RSB1/SBis OH, halogen, ONa, OK, or ORSB1a/SB, ASB1/SBand RSB1a/SBare each a substituted or unsubstituted aliphatic hydrocarbon structure, a substituted or unsubstituted aromatic ring structure, or a substituted or unsubstituted heterocyclic structure, m is an integer of 0-7, and x is an integer of 1-8. PCOPYRIGHT: (C)2005,JPO&NCIPI