Developing agent
AssigneesKabushiki Kaisha Toshiba, Toshiba Tec Kabushiki Kaisha
InventorsShuitsu Sato, Takashi Urabe, Yasuhito Noda
Life of this patent
Estimating the term…
Abstract
The invention provides a developing agent that includes color toners and a black toner. The color toners include a yellow toner, a magenta toner and a cyan toner. Each of the yellow toner, the magenta toner and the cyan toner contains, as a binder resin, a mixture of an H form of polyester mainly containing higher molecular components polyester, and an L form of polyester mainly containing lower molecular components of polyester. The black toner contains, as a binder resin, a mixture of an H form of polyester mainly containing higher molecular components of polyester, and an L form of polyester mainly containing lower molecular components polyester, and a crystalline polyester resin.
Claims9
A developing agent comprising color toners and a black toner, said color toners comprising a yellow toner, a magenta toner and a cyan toner, wherein the yellow toner, the magenta toner and the cyan toner each comprise, as a binder resin, a mixture of an H form of polyester substantially comprising higher molecular weight components thereof, and an L form of polyester substantially comprising lower molecular weight components thereof;
- and the black toner comprises, as a binder resin, a mixture of an H form of polyester substantially comprising higher molecular weight components thereof, and an L form of polyester substantially comprising lower molecular weight components thereof, and a crystalline polyester resin.
A developing agent comprising color toners and a black toner, said color toners comprising a yellow toner, a magenta toner and a cyan toner, wherein the yellow toner, the magenta toner and the cyan toner each comprise, as a binder resin, a mixture of an H form of polyester substantially comprising higher molecular weight components thereof, and an L form of polyester substantially comprising lower molecular weight components thereof and wherein the binder resin of each of the yellow toner, the magenta toner and the cyan toner does not comprise a crystalline polyester resin;
- and the black toner comprises, as a binder resin, a mixture of an H form of polyester substantially comprising higher molecular weight components thereof, and an L form of polyester substantially comprising lower molecular weight components thereof, and a crystalline polyester resin.
A developing agent comprising color toners and a black toner, said color toners comprising a yellow toner, a magenta toner and a cyan toner, wherein a binder resin of each of the yellow toner, the magenta toner and the cyan toner consists essentially of a mixture of an H form of polyester substantially comprising higher molecular weight components thereof, and an L form of polyester substantially comprising lower molecular weight components thereof;
- and a binder resin of the black toner comprises a mixture of an H form of polyester substantially comprising higher molecular weight components thereof, and an L form of polyester substantially comprising lower molecular weight components thereof, and a crystalline polyester resin.
Dependencies are inferred from the claim text.