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US 10,591,829 B2Granted
Toner having low temperature fixing and high durability characteristics
AssigneesKabushiki Kaisha Toshiba, Toshiba Tec Kabushiki Kaisha
InventorTsutomu Katsumata
Life of this patent
Estimating the term…
Abstract
A toner according to an embodiment includes a colorant, a binder resin, and an ester wax. The colorant, the binder resin and the ester wax form a toner particle. The ester wax contains two or more ester compounds represented by the general formula R1COOR2, where R1 and R2 each independently is an alkyl group. The total number of carbon atoms of R1 and R2 is in a range from 31 to 53. The two or more ester compounds have different number of carbon atoms from each other.
Claims16
A toner, comprising:
- a colorant;
- a binder resin;
- and
- an ester wax, wherein:
- the colorant, the binder resin and the ester wax form a toner particle,
- the ester wax contains a plurality of ester compounds, each ester compound represented by the general formula R1COOR2, where:
- R1 and R2 each independently is an alkyl group in which a total number of carbon atoms of R1 and R2 is in a range from 31 to 53, the plurality of ester compounds comprises:
- a first ester compound that has the greatest weight percentage among the plurality of ester compounds in the ester wax, the first ester compound having a total number of carbon atoms within a range from 40 to 44, endpoints inclusive, and
- a second ester compound that has a number of carbon atoms greater than 44, and
- the ester wax satisfies the formulas 1.03≤b/a≤1.61 and 0.06≤c/a≤0.90, where:
- “a” indicates the total content of the first ester compound by weight percentage of the ester wax, “b” indicates the total content of all ester compounds among the plurality of ester compounds which have a number of carbon atoms within the range from 40 to 44 by weight percentage of the ester wax, and “c” indicates the total content of all ester compounds among the plurality of ester compounds which have a total number of carbon atoms greater than 44, wherein:
- the first ester compound has a total number carbon atoms equal to Cn1 and the second ester compound has a total number of carbon atoms equal to Cm1, and the difference between Cm1 and Cn1 is equal to or greater than 4.
9 more elements
An image forming apparatus, comprising:
- a photoreceptor drum;
- a charging charger configured to charge a surface of the photoreceptor drum;
- a laser unit configured to form an electrostatic latent image on the surface of the photoreceptor drum;
- a developing device including a toner and configured to develop the electrostatic latent image with the toner;
- a transfer charger configured to transfer the developed image onto a sheet;
- and
- a cleaning device configured to remove a residual toner on the photoreceptor drum,
- wherein the toner includes:
- a colorant;
- a binder resin;
- and
- an ester wax, wherein:
- the colorant, the binder resin and the ester wax form a toner particle,
- the ester wax contains a plurality of ester compounds, each ester compound represented by the general formula R1COOR2, where:
- R1 and R2 each independently is an alkyl group in which a total number of carbon atoms of R1 and R2 is in a range from 31 to 53,
- the plurality of ester compounds comprises:
- a first ester compound that has the greatest weight percentage among the plurality of ester compounds in the ester wax, the first ester compound having a total number of carbon atoms within a range from 40 to 44, endpoints inclusive, and
- a second ester compound that has a number of carbon atoms greater than 44, and
- the ester wax satisfies the formulas 1.03≤b/a≤1.61 and 0.06≤c/a≤0.90, where:
- “a” indicates the total content of the first ester compound by weight percentage of the ester wax, “b” indicates the total content of all ester compounds among the plurality of ester compounds which have a number of carbon atoms within the range from 40 to 44 by weight percentage of the ester wax, and “c” indicates the total content of all ester compounds among the plurality of ester compounds which have a total number of carbon atoms greater than 44, wherein:
- the first ester compound has a total number carbon atoms equal to Cn1 and the second ester compound has a total number of carbon atoms equal to Cm1, and the difference between Cm1 and Cn1 is equal to or greater than 4.
18 more elements
Dependencies are inferred from the claim text.