JP2009300710A5

JP2009300710A5 -

Info

Publication number: JP2009300710A5
Application number: JP2008154872A
Authority: JP
Filing date: 2008-06-13
Publication date: 2011-07-28
Anticipated expiration: 2028-06-13

Claims

A two-component developer comprising a toner and a carrier, comprising: an electrostatic latent image bearing member; a developer bearing member disposed facing the electrostatic latent image bearing member; and a magnetic roll disposed facing the developer bearing member. The two-component developer is held on the magnetic roll, and the toner is transferred from the magnetic roll onto the developer carrying member to form a toner layer. The electrostatic latent image An image including a developing step of developing by applying an electric field between the carrier and the developer carrier to transfer toner onto the electrostatic latent image formed on the electrostatic latent image carrier. In the forming method,
The toner is a toner having toner particles containing at least a binder resin, a colorant and a wax component, and an inorganic fine powder,
The number average particle diameter (D1) of the toner is 3.00 μm or more and 8.00 μm or less,
In the micro-compression test for the toner, the particle diameter of the toner to be measured was D (μm), and a load of 9.8 × 10 ⁻⁴ N / load was applied to one particle of the toner at a load speed of 9.8 × 10 ⁻⁵ N / sec. When the maximum displacement amount is X ₁₀₀ (μm) and the displacement amount when the load is 2.0 × 10 ⁻⁴ N is X ₂₀ (μm), the following formulas (1) to (3) are satisfied. Image forming method.
(1) The viscosity at 100 ° C. is 10000 Pa · s or more and 150,000 Pa · s or less (2) 0.100 ≦ X ₁₀₀ /D≦0.900
(3) 0.010 ≦ X ₂₀ /D≦0.070

The toner displacement amounts X ₁₀₀ (μm) and X ₂₀ (μm) are:
0.400 ≦ X ₁₀₀ /D≦0.850, 0.015 ≦ X ₂₀ /D≦0.060
The image forming method according to claim 1 , wherein:

The viscosity of 100 ° C. of the toner, the image forming method according to claim 1 or 2, characterized in that not more than 15000Pa · s or more 100000 Pa · s.

The viscosity of 100 ° C. of the toner, the image forming method according to any one of claims 1 to 3, characterized in that not more than 25000Pa · s or more 40 000 Pa · s.

In the molecular weight distribution chart measured by gel permeation chromatography (GPC) of the tetrahydrofuran (THF) soluble content of the toner, the molecular weight (M1) of the main peak is 10,000 to 80,000,
When the molecular weight of the front texture in peak (M1) of the height H (M1), the height of the molecular weight of 4,000 was H (4000),
H (4,000): H (M1) = (0.100 to 0.950): 1.00
The image forming method according to any one of claims 1 to 4, characterized by satisfying the.

The toner particle is a polymerizable monomer composition containing at least a polymerizable monomer, a colorant, a wax component, a polyester resin, and a homopolymer or copolymer obtained by polymerizing styrene or a styrene derivative. things is dispersed in an aqueous medium, the granulated, image forming method according to any one of claims 1 to 5, characterized in that the polymerizable monomer is obtained by polymerizing.

The image forming method according to claim 6 , wherein a glass transition temperature (Tg p ) of the polyester resin and a glass transition temperature (Tg t ) of the toner satisfy the following (4) to (6).
(4) 60 ° C. ≦ Tgp ≦ 80 ° C.
(5) 60 ° C. ≦ Tgt
(6) 10 ° C. ≦ Tgp−Tgt ≦ 30 ° C.

The image forming method according to claim 6 or 7, wherein a glass transition temperature (Tgp) of the polyester resin and a glass transition temperature (Tgt) of the toner satisfy the following (7) to (9).
(7) 60 ° C. ≦ Tgp ≦ 80 ° C.
(8) 55 ° C. ≦ Tgt
(9) 10 ° C. ≦ Tgp−Tgt ≦ 30 ° C.

The carrier is a magnetic carrier, i) includes a carrier core and a resin component, ii) has a true specific gravity of 2.5 to 4.2 g / cm ³ , and iii) has a volume-based 50% particle size (D50). a 15 to 40 [mu] m, iv) the average circularity is 0.900 to 0.970, the coefficient of variation of the average circularity is characterized in that 1.0 to 10.0% of claims 1 to 8 The image forming method according to any one of the above.

A two-component developer comprising a toner and a carrier, comprising: an electrostatic latent image bearing member; a developer bearing member disposed facing the electrostatic latent image bearing member; and a magnetic roll disposed facing the developer bearing member. The two-component developer is held on the magnetic roll, and the toner is transferred from the magnetic roll onto the developer carrying member to form a toner layer. The electrostatic latent image An image including a developing step of developing by applying an electric field between the carrier and the developer carrier to transfer toner onto the electrostatic latent image formed on the electrostatic latent image carrier. A toner used in a forming method,
The toner has toner particles containing at least a binder resin, a colorant and a wax component, and inorganic fine powder,
The number average particle diameter (D1) of the toner is 3.00 μm or more and 8.00 μm or less,
In the micro-compression test for the toner, the particle diameter of the toner to be measured was D (μm), and a load of 9.8 × 10 ⁻⁴ N / load was applied to one particle of the toner at a load speed of 9.8 × 10 ⁻⁵ N / sec. When the maximum displacement amount is X ₁₀₀ (μm) and the displacement amount at a load of 2.0 × 10 ⁻⁴ N is X ₂₀ (μm), the following (1) to (3) are satisfied. toner.
(1) Viscosity at 100 ° C. is 10,000 Pa · s or more and 150,000 Pa · s or less (2) 0.100 ≦ X ₁₀₀ /D≦0.900
(3) 0.010 ≦ X ₂₀ /D≦0.070