Patent ID: 8067136

Claim:
A charge control agent for controlling a charged state of powder, comprising one or more units each represented by the following chemical formula (1) in a molecule: (in the formula: R represents -A 1 -SO 2 R 1 ; R 1 represents OH, a halogen atom, ONa, OK, or OR 1a ; R 1a and A 1 each independently represent a group having a substituted or unsubstituted aliphatic hydrocarbon structure, a substituted or unsubstituted aromatic ring structure, or a substituted or unsubstituted heterocyclic structure; and wherein l is an integer selected from 0 to 4; in addition, with regard to l, m, Z 1a , and Z 1b in the formula: when l represents an integer selected from 2 to 4, Z 1a represents nothing or a linear alkylene chain having 1 to 4 carbon atoms, Z 1b represents a hydrogen atom, and m represents an integer selected from 0 to 8; when l represents 1 and Z 1a represents a linear alkylene chain having 1 to 4 carbon atoms, Z 1b represents a hydrogen atom and m represents an integer selected from 0 to 8; when l represents 1 and Z 1a represents nothing, Z 1b represents a hydrogen atom and m represents 0; when l represents 0 and Z 1a represents a linear alkylene chain having 1 to 4 carbon atoms, the linear alkylene chain may be substituted by a linear or branched alkyl group, or an alkyl group containing a residue having any one of a phenyl structure, a thienyl structure, and a cyclohexyl structure at a terminal thereof, Z 1b represents a hydrogen atom, or a linear or branched alkyl group, aryl group, or aralkyl group which may be substituted by an aryl group, and m represents an integer selected from 0 to 8; and when l represents 0 and Z 1a represents nothing, Z 1b represents a hydrogen atom, or a linear or branched alkyl group, aryl group, or aralkyl group which may be substituted by an aryl group, and m represents an integer selected from 0 to 8; in addition, when multiple units exist, R, R 1 , R 1a , A 1 , Z 1a , Z 1b , l, and m each independently have the above meaning for each unit.)