JP2010039263A5

JP2010039263A5 -

Info

Publication number: JP2010039263A5
Application number: JP2008202912A
Authority: JP
Filing date: 2008-08-06
Publication date: 2011-09-22
Anticipated expiration: 2028-08-06

Claims

An electrostatic charge image carrier for carrying an electrostatic charge image is charged by a charging member placed in contact with the electrostatic latent image carrier, and an electrostatic charge image is formed on the charged electrostatic image carrier to carry a toner. developing the electrostatic image by a magnetic toner carried on the body is an image forming how to have a process for forming a toner image,
Electrostatic charge image bearing member, 25 ° C., under humidity of 50% in hard Do試 test using Vickers quadrangular pyramid diamond indenter, an elastic deformation rate when pushed by the load 5mN less than 45% 30% Yes,
The magnetic toner, viewed contains a binder resin and a magnetic material including magnetic toner particles and an inorganic fine powder and organic fine powder,
The magnetic toner has the following formula (1)
Compression rate = {1- (apparent density / tap density)} × 100 Formula (1)
The compression ratio obtained from is 30% or less,
The organic fine powder is a resin particle having a number average particle diameter (D1) of 0.05 μm or more and 1.00 μm or less,
An image forming method, wherein a liberation rate of the resin particles from the magnetic toner particles is 3% by mass or less.

The electrostatic charge image carrier has a surface layer represented by the following formula (2):

(In the formula (2), X represents a single bond, —O—, —S—, or a substituted or unsubstituted alkylidene group. R _{11 to} R ₁₈ are the same or different and represent a hydrogen atom, a halogen atom, an alkoxy group, A nitro group, a substituted or unsubstituted alkyl group or a substituted or unsubstituted aryl group is indicated.)
In indicated, and the weight average molecular weight (Mw) of Ru photoreceptor der containing 30 mass% or less than 5 wt% of a polycarbonate resin having a structural unit is 7.5 × 10 ³ or more 2.0 × 10 ⁴ or less the image forming method according to claim 1, wherein the this.

The total energy measured with the powder flowability measuring device of the magnetic toner is expressed by the following formulas (3) and (4).
800 ≦ TE ₁₀ ≦ 1400 Formula (3)
TE ₁₀ / TE ₁₀₀ ≦ 1.60 Formula (4)
(TE ₁₀ ; Total Energy when the stirring speed is 10 revolutions, TE ₁₀₀ ; Total Energy when the stirring speed is 100 revolutions)
The image forming method according to claim 1, wherein:

The specific surface area of the resin particles measured by the BET method is 10 m ² / g or more and 80 m ² / g or less, and the weight average molecular weight (Mw) is 50,000 or more and 1,000,000 or less. 4. The image forming method according to any one of 3 above.

5. The image forming method according to claim 1 , wherein the magnetic toner has a residual magnetization of 3.0 Am ² / kg or less when magnetized at a magnetic field of 79.6 kA / m.

Magnetic toner, image forming method according to any one of claims 1 to 5, characterized in that the magnetic toner particles are toner particles produced by suspension polymerization.

The image forming method according to claim 1, wherein the magnetic toner is produced by a pulverization method in which the magnetic toner particles include a surface modification step by heat treatment.

A process cartridge having an electrostatic charge image carrier and a developer container having magnetic toner;
The electrostatic charge image bearing member has an elastic deformation ratio of 30% or more and 45% or less when pressed with a load of 5 mN when tested for hardness using a Vickers square pyramid diamond indenter in an environment of 25 ° C. and 50% humidity. Yes,
The magnetic toner includes magnetic toner particles containing a binder resin and a magnetic material, inorganic fine powder and organic fine powder,
The magnetic toner has the following formula (1)
Compression rate = {1- (apparent density / tap density)} × 100 Formula (1)
The compression ratio obtained from is 30% or less,
The organic fine powder is a resin particle having a number average particle diameter (D1) of 0.05 μm or more and 1.00 μm or less,
A process cartridge having a release rate of the resin particles from the magnetic toner particles of 3% by mass or less .

An electrostatic charge image carrier for carrying an electrostatic charge image is charged by a charging member disposed in contact with the electrostatic charge image carrier, and an electrostatic charge image is formed on the charged electrostatic charge image carrier, thereby forming a toner carrier. A magnetic toner applied to an image forming method including a step of developing an electrostatic charge image with a magnetic toner carried on the toner to form a toner image;
The electrostatic charge image bearing member has an elastic deformation rate of 30% or more and 45% or less when pressed with a load of 5 mN when tested for hardness using a Vickers square pyramid diamond indenter in an environment of 25 ° C. and 50% humidity. Yes,
The magnetic toner includes magnetic toner particles containing a binder resin and a magnetic material, inorganic fine powder and organic fine powder,
The magnetic toner has the following formula (1)
Compression rate = {1- (apparent density / tap density)} × 100 Formula (1)
The compression ratio obtained from is 30% or less,
The organic fine powder is a resin particle having a number average particle diameter (D1) of 0.05 μm or more and 1.00 μm or less,
A magnetic toner, wherein the resin particles have a liberation rate of 3% by mass or less from the magnetic toner particles.