Patent ID: 7429441

Claim:
An electrostatic charge developing toner which is characterized by the fact that in an electrostatic charge developing toner which contains a bonding resin and a coloring agent as essential components, a β-type copper phthalocyanine pigment which has a BET specific surface area of greater than 90 m 2 /g and a longitudinal-lateral aspect ratio of 1 to 3, and which further contains a phthalocyanine pigment derivative expressed by the following general formula (I) or (II) a) Chemical Formula 1: P——(Y) n (I) b) Chemical Formula 2: P—(A-Z) n (II) wherein P indicates a residue formed by removing the hydrogen of n phthalocyanine rings which either have a central metal or do not have a central metal, Y indicates a primary to tertiary amino group, carboxylic acid group, sulfonic acid group or salt of the same with a base or metal, A indicates an alkylene group with 1 to 3 carbon atoms, —CO 2 —, —SO 2 — or —SO 2 NH(CH 2 ) m —, Z indicates a residue formed by removing at least one hydrogen atom on the nitrogen atom of a primary or secondary amino group, or a residue formed by removing at least one hydrogen atom on the nitrogen atom of a phthalimide group; m is 1 to 4; and n is 1 to 4.