JP2008015221A5

JP2008015221A5 -

Info

Publication number: JP2008015221A5
Application number: JP2006186247A
Authority: JP
Filing date: 2006-07-06
Publication date: 2009-08-20
Anticipated expiration: 2026-07-06

Claims

Using the toner carrying member having an elastic layer on the surface and having a magnetic field generating means fixed inside, by the magnetic field generating means of the fixing attract magnetic toner to the toner carrying member surface, the regulating blade on said toner carrying member surface regulates the toner, the toner carrying member rotates while pressed against the image bearing member, the toner carrying member a developing bias is applied to, by transferring the toner on the image bearing member, formed on the image bearing member In a magnetic toner used in a magnetic one-component development method for developing a formed electrostatic latent image,
(I) the weight average particle diameter of the toner is 3 to 9 μm;
(Ii) The ratio (B / A) of the content (B) of the iron element to the content (A) of the carbon element present on the toner surface as measured by X-ray photoelectron spectroscopy is less than 0.0010,
(Iii) When the toner is dissolved in 5 mol / liter hydrochloric acid, the dissolution rate S ₃ , S ₁₅ , S ₃₀ (mass%) of the magnetic material with respect to the total content of the magnetic material at 3 minutes, 15 minutes, and 30 minutes A magnetic toner wherein the ratio Sc of the dissolution amount from 3 minutes to 15 minutes to the dissolution amount from 15 minutes to 30 minutes satisfies the following formula:
· 0.5 ≦ S ₃ ≦ 10
・ 40 ≦ S ₁₅ ≦ 80
・ S ₃₀ ≧ 80
・ 1.2 ≦ S _c ≦ 10

When the toner is dissolved in 5 mol / liter hydrochloric acid, the dissolution rate S ₃ , S ₁₅ , S ₃₀ (mass%) of the magnetic material relative to the total content of the magnetic material at 3 minutes, 15 minutes, and 30 minutes and 15 minutes a magnetic toner according to claim 1, the ratio S _c of the dissolution amount of up to 3 minutes to 15 minutes for the dissolution amount of up to 30 minutes and satisfies the following expression.
· 0.5 ≦ S ₃ ≦ 5
・ 45 ≦ S ₁₅ ≦ 75
・ S ₃₀ ≧ 85
・ 1.5 ≦ S _c ≦ 8

The magnetic toner according to claim 1, wherein an average circularity of the magnetic toner is 0.940 or more.

4. The magnetic toner according to claim 1, wherein the magnetic material is subjected to a hydrophobic treatment.

5. The magnetic toner according to claim 1, wherein the iron oxide is contained in an amount of 10 to 200 parts by mass with respect to 100 parts by mass of the binder resin.

6. The magnetic toner according to claim 1, wherein the magnetic toner is produced in an aqueous medium.

To any one of claims 1 to 6 coating amount per unit area of the toner is regulated to the toner carrying member surface by the restriction blade is characterized by a 5.0~14.0g / m ² The magnetic toner described.

The developing bias is obtained by superimposing a DC voltage on an alternating voltage, the maximum absolute value of the developing bias V is | V | max, and a predetermined voltage value for uniformly charging the surface of the image carrier by the charging means ( The magnetic toner according to claim 1, wherein a dark potential is Vd and the formula (1) is satisfied.
| V | max ≦ | Vd | (1)

Using the toner carrying member having an elastic layer on the surface and having a magnetic field generating means fixed inside, by the magnetic field generating means of the fixing attract magnetic toner to the toner carrying member surface, the regulating blade on said toner carrying member surface regulates the toner, the toner carrying member rotates while pressed against the image bearing member, the toner carrying member a developing bias is applied to, by transferring the toner on the image bearing member, formed on the image bearing member A magnetic one-component developing method for developing a latent electrostatic latent image,
(I) the weight average particle diameter of the toner is 3 to 9 μm;
(Ii) The ratio (B / A) of the content (B) of the iron element to the content (A) of the carbon element present on the toner surface as measured by X-ray photoelectron spectroscopy is less than 0.0010,
(Iii) From the dissolution rate S ₃ , S ₁₅ , S ₃₀ (mass%) with respect to the total content of the magnetic substance at 3 minutes, 15 minutes and 30 minutes when the toner is dissolved in 5 mol / liter hydrochloric acid and from 15 minutes image forming method characterized in that the ratio S _c of the dissolution amount of up to 3 minutes to 15 minutes satisfies the following formula with respect to the dissolved amount of up to 30 minutes.
・ 0.5 ≦ S ₃ ≦ 10
・ 40 ≦ S ₁₅ ≦ 80
・ S ₃₀ ≧ 80
・ 1.2 ≦ S _c ≦ 10

When the toner is dissolved in 5 mol / liter hydrochloric acid, the dissolution rate S ₃ , S ₁₅ , S ₃₀ (mass%) of the magnetic material relative to the total content of the magnetic material at 3 minutes, 15 minutes, and 30 minutes and 15 minutes the image forming method according to claim 9, wherein the ratio S _c of the dissolution amount of up to 3 minutes to 15 minutes satisfies the following formula with respect to the dissolved amount of up to 30 minutes.
・ 0.5 ≦ S ₃ ≦ 5
· 45 ≦ S ₁₅ ≦ 75
・ S ₃₀ ≧ 85
・ 1.5 ≦ S _c ≦ 8

The image forming method according to claim 9 or 10 , wherein the magnetic toner has an average circularity of 0.940 or more.

In magnetic toner, image forming method according to any one of claims 9 to 11 magnetic body is characterized in that it is hydrophobicized.

The iron oxide, an image forming method according to any one of claims 9 to 12, characterized in that it is contained 10 to 200 parts by mass with respect to 100 parts by weight of the binder resin.

The image forming method according to any one of claims 9 to 13, characterized in that magnetic toner is produced in an aqueous medium.

In any one of claims 9 to 14, wherein the coating amount per unit area of the toner is regulated to the toner carrying member surface by the restriction blade is 5.0~14.0g / m ² The image forming method described.

The developing bias is obtained by superimposing a DC voltage on an alternating voltage, the maximum absolute value of the developing bias V is | V | max, and a predetermined voltage value for uniformly charging the surface of the image carrier by the charging means ( the dark potential) as Vd, image forming method according to any one of claims 9 to 15, characterized by satisfying the expression (1).
| V | max ≦ | Vd | (1)