Porous electrophotographic toner and preparation process of making

Claim 2

Porous toner which comprises a coloring matter and a binder, said toner being formed by obtaining 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 having a particle size from 0.01-20 microns which neither softens nor melts at a temperature at which said binder softens or melts, and by treating said powder with a 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.

Claim 3

Porous toner as set forth in claim 1, wherein said toner preparing material includes magnetic powder.

Claim 4

Porous toner as set forth in claim 1, wherein said binder consists of a pressure fixable component.

Claim 5

Porous toner as set forth in claim 3, wherein said pressure fixable component is selected from ethylene type polymers having a melt-viscosity of from 10 to 10 6 cps at 140° C.

Claim 6

Porous toner as set forth in claim 1, wherein said elimination compound is contained in said toner components at a rate of from 10 to 90% by weight.

Claim 7

Porous toner as set forth in claim 1, wherein said solvent is an organic solvent.

Claim 8

Porous toner as set forth in claim 1, wherein said solvent is water.

Claim 9

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.

Claim 10

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.

Claim 11

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.

Claim 12

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.

Claim 13

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.

Claim 14

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.

Claim 15

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.

Claim 16

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.

Claim 17

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.

Claim 18

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.