Patent ID: 7422832
Filing Date: 2008-09-09
Classification: G03G

Abstract:
1. A magnetic toner comprising magnetic toner particles each comprising at least a monoazo iron compound, an aluminum compound of an aromatic hydroxyl carboxylic acid, a binder resin and a magnetic iron oxide, wherein: the magnetic toner has a saturation magnetization σs being in the range of 5 to 60 Am the binder resin contains a polyester component polymerized by using a Ti chelate compound having a ligand selected from the group consisting of a diol, a dicarboxylic acid, and an oxycarboxylic acid as a catalyst; and the Ti chelate compound is represented by any one of the following formulae (I) to (IV): in the formula (I), R 1 denotes one of an alkylene group or an alkenylene group each having 2 to 10 carbon atoms and may have a substituent, M denotes a countercation, m denotes a cation number, n denotes a cation valence, n=2 when m=1, n=1 when m=2, and M denotes one of a hydrogen ion, an alkali metal ion, an ammonium ion, or an organic ammonium ion when n=1, or denotes an alkali earth metal ion when n=2; in the formula (II), R 2 denotes one of an alkylene group or an alkenylene group each having 1 to 10 carbon atoms and may have a substituent, M denotes a countercation, m denotes a cation number, n denotes a cation valence, n=2 when m=1, n=1 when m=2, and M denotes one of a hydrogen ion, an alkali metal ion, an ammonium ion, or an organic ammonium ion when n=1, or denotes an alkali earth metal ion when n=2; in the formula (III), M denotes a countercation, m denotes a cation number, n denotes a cation valence, n=2 when m=1, n=1 when m=2, and M denotes one of a hydrogen ion, an alkali metal ion, an ammonium ion, or an organic ammonium ion when n=1, or denotes an alkali earth metal ion when n=2; in the formula (IV), R 3 denotes one of an alkylene group or an alkenylene group each having 1 to 10 carbon atoms and may have a substituent, M denotes a countercation, m denotes a cation number, n denotes a cation valence, n=2 when m=1, n=1 when m=2, and M denotes one of a hydrogen ion, an alkali metal ion, an ammonium ion, or an organic ammonium ion when n=1, or denotes an alkali earth metal ion when n=2, wherein the polyester component comprises a compound having a structure containing oxyalkylene ether of a novolak phenolic resin as an alcohol component; and wherein the metal compound of an aromatic hydroxyl carboxylic acid is represented by the following formula (13): wherein M represents aluminum; (B) represents (I) a group of the following structure: which may contain a substituent, wherein X represents a hydrogen atom, a halogen atom, or a nitro group; or (ii) wherein, R represents a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, or an alkenyl group having 2 to 18 carbon atoms, A′ + represents hydrogen, a sodium ion, a potassium ion, an ammonium ion, or an aliphatic ammonium ion and Z represents —O— or —C(═O)—O—.