Process cartridge
First Claim
1. A process cartridge comprising an electrostatic image bearing member and a developing means for developing an electrostatic image formed on the electrostatic image bearing member, which comprises a toner;
- said electrostatic image bearing member and said developing means being held into one unit as a cartridge; and
said process cartridge being detachable from the main body of an image forming apparatus;
wherein;
said toner comprises a composition containing at least a polymer component (A) and a charge control agent,wherein;
said polymer component (A);
a) contains substantially no tetrahydrofuran-insoluble matter;
b) in a chromatogram in gel permeation chromatography for tetrahydrofuran-soluble matter of said polymer component (A), has a main peak in the region of molecular weight of from 3,000 to 30,000 and a subpeak or a shoulder in the region of molecular weight of from 100,000 to 3,000,000; and
c) has a low-molecular weight polymer component (L) corresponding to the region of molecular weight less than 50,000 in a chromatogram in gel permeation chromatography, having an acid value AVL of from 21 mg·
KOH/g to 35 mg·
KOH/g, and a high-molecular weight polymer component (H) corresponding to the region of molecular weight not less than 50,000 in the chromatogram in gel permeation chromatography, having an acid value AVH of from 0.5 mg·
KOH/g to 11 mg·
KOH/g;
said acid values having a difference of 10≦
(AVL -AVH)≦
27.
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Accused Products
Abstract
A toner is comprised of a composition containing at least a polymer component and a charge control agent. The polymer component contains substantially no tetrahydrofuran (THF)-insoluble matter. The polymer component THF-soluble has a major peak and a minor peak in the specific molecular weight regions in gel permeation chromatography (GPC). The low molecular weight component and high molecular weight component of the polymer component, each of which shows the specific molecular weight region in GPC, have the specific acid values, respectively. The difference between the acid values is in the specific range.
44 Citations
23 Claims
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1. A process cartridge comprising an electrostatic image bearing member and a developing means for developing an electrostatic image formed on the electrostatic image bearing member, which comprises a toner;
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said electrostatic image bearing member and said developing means being held into one unit as a cartridge; and
said process cartridge being detachable from the main body of an image forming apparatus;wherein; said toner comprises a composition containing at least a polymer component (A) and a charge control agent, wherein; said polymer component (A); a) contains substantially no tetrahydrofuran-insoluble matter; b) in a chromatogram in gel permeation chromatography for tetrahydrofuran-soluble matter of said polymer component (A), has a main peak in the region of molecular weight of from 3,000 to 30,000 and a subpeak or a shoulder in the region of molecular weight of from 100,000 to 3,000,000; and c) has a low-molecular weight polymer component (L) corresponding to the region of molecular weight less than 50,000 in a chromatogram in gel permeation chromatography, having an acid value AVL of from 21 mg·
KOH/g to 35 mg·
KOH/g, and a high-molecular weight polymer component (H) corresponding to the region of molecular weight not less than 50,000 in the chromatogram in gel permeation chromatography, having an acid value AVH of from 0.5 mg·
KOH/g to 11 mg·
KOH/g;
said acid values having a difference of 10≦
(AVL -AVH)≦
27. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification