Toner for developing electrostatic image, process for producing the same, fine resin particle dispersion, releasing agent dispersion, developer for developing electrostatic image, and process for forming image

A process for producing a toner for developing an electrostatic image, the process comprising the steps of:

• forming a first resin particle dispersion containing binder resin particles;
• forming aggregated particles by aggregating the first particles;
• and
• fusing the aggregated particles, by heating, to form toner particles having a particle size distribution index on a small particle side GSDpS in number distribution of a particle diameter represented by the following equation (I) of about 1.27 or less:
• GSDPS=D50p/D16p (I)
• wherein D50p represents a particle diameter providing a particle diameter accumulation in number distribution of 50%, and D16p represents a particle diameter providing a particle diameter accumulation in number distribution of 16% from a small diameter side.

A releasing agent dispersion comprising a releasing agent dispersed therein, particles of the releasing agent having a volume average particle diameter in a range of about from 100 to 300 nm, and having a particle size distribution index on a small particle side GSDvS and a particle size distribution index on a large particle side GSDvL in volume distribution of a particle diameter represented by the following equations (III) and (IV), respectively both of which is about 2.0 or less:

• GSDvS=D50v/D16v (III)
• wherein D50v represents a particle diameter providing a particle diameter accumulation in volume distribution of 50%, and D16v represents a particle, diameter providing a particle diameter accumulation in volume distribution of 16% from a small diameter side
• GSDvL=D50v/D84v (V)
• wherein D50v represents a particle diameter providing a particle diameter accumulation in volume distribution of 50%, and D84v represents a particle diameter providing a particle diameter accumulation in volume distribution of 84% from a small diameter side.

A process for forming an image, comprising the steps of:

• forming an electrostatic latent image on an electrostatic image holding member;
• developing the electrostatic latent image with a developer to form a toner image on a developer holding member;
• and
• transferring the toner image to a transfer material, the developer containing toner particles having a particle size distribution index on a small particle side GSDpS in number distribution of a particle diameter represented by the following equation (I) of about 1.27 or less:
• GDpS=D50p/D16p (I)
• wherein D50p represents a particle diameter providing a particle diameter accumulation in number distribution of 50%, and D16p represents a particle diameter providing a particle diameter accumulation in number distribution of 16% from a small diameter side.