Porous electrophotographic toner and preparation process of making

Porous toner which comprises a coloring matter and a binder, said toner being formed by mixing and kneading under heat a toner preparing material including a coloring matter, a binder and an elimination compound having a particle size from 0.01-20 microns which neither softens nor melts at a temperature at which said binder softens or melts, then finely dividing the mixture to form powder and thereafter applying heat treatment to the powder, followed by treating the powder with the solvent to remove said elimination compound to thereby form irregular shaped particles having voids or pores from 0.01 to 20 microns in diameter in the surface and interior thereof.

Porous toner which comprises a coloring matter and a binder, said toner being formed by mixing and kneading under heat a toner preparing material including a coloring matter, a binder and an elimination compound having a particle size from 0.01 to 20 microns which neither softens nor melts at a temperature at which said binder softens or melts, then finely dividing the mixture to form powder, and treating the powder with a solvent to remove said elimination compound, followed by applying heat treatment to the powder to thereby form irregular shaped particles having voids or pores from 0.1 to 20 microns in diameter in the surface and interior thereof.

A process for preparing a porous toner which comprises forming a powder through a step of mixing and kneading under heat a toner preparing material including a coloring matter, a binder and an elimination compound which neither softens nor melts at a temperature at which said binder softens or melts, and treating said powder with a solvent to remove said elimination compound.

A process for preparing a porous toner which comprises mixing and kneading under heat a toner preparing material including a coloring matter, a binder and an elimination compound which neither softens nor melts at a temperature at which said binder softens or melts, then finely dividing the mixture to form powder, and thereafter applying heat treatment to the powder, followed by treating the powder with a solvent to remove said elimination compound.

A process for preparing a porous toner which comprises mixing and kneading under heat a toner preparing material including a coloring matter, a binder and an elimination compound which neither softens nor melts at a temperature at which said binder solftens or melts, then finely dividing the mixture to form powder, and treating the powder with a solvent to remove said elimination compound, followed by applying heat treatment to the powder.