Toner, image-forming apparatus, process cartridge and image forming method
First Claim
1. A toner comprising a binder resin and a colorant, wherein;
- said toner contains as the binder resin at least a vinyl resin selected from the group consisting of;
a vinyl resin having a carboxyl group and a vinyl resin having an epoxy group;
a vinyl resin having a carboxyl group and an epoxy group; and
a vinyl resin produced by the reaction of a carboxyl group with an epoxy group; and
said toner has, in its dielectric dissipation factor (tan δ
), at least a maximum value and a minimum value in the temperature range of from 20°
C. to 150°
C., and, where the maximum value is represented by Max and the minimum value by Min, has a value of log10(Max/Min)≦
2.
1 Assignment
0 Petitions
Accused Products
Abstract
In a toner comprising a binder resin and a colorant, the toner contains as the binder resin at least a vinyl resin selected from the group consisting of i) a vinyl resin having a carboxyl group and a vinyl resin having an epoxy group, ii) a vinyl resin having a carboxyl group and an epoxy group and iii) a vinyl resin produced by the reaction of a carboxyl group with an epoxy group, and the toner has, in its dielectric dissipation factor (tan δ), at least a maximum value and a minimum value in the temperature range of from 20° C. to 150° C., and, where the maximum value is represented by Max and the minimum value by Min, has a value of log10(Max/Min)≦2. Also disclosed are an image-forming apparatus, a process cartridge and an image-forming method which make use of the toner.
-
Citations
44 Claims
-
1. A toner comprising a binder resin and a colorant, wherein;
-
said toner contains as the binder resin at least a vinyl resin selected from the group consisting of;
a vinyl resin having a carboxyl group and a vinyl resin having an epoxy group;
a vinyl resin having a carboxyl group and an epoxy group; and
a vinyl resin produced by the reaction of a carboxyl group with an epoxy group; and
said toner has, in its dielectric dissipation factor (tan δ
), at least a maximum value and a minimum value in the temperature range of from 20°
C. to 150°
C., and, where the maximum value is represented by Max and the minimum value by Min, has a value of log10(Max/Min)≦
2.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
said element A being contained in said magnetic material in a content of from 0.1% by weight to 4.0% by weight on the basis of Fe in said magnetic material; and
said magnetic material standing liberated into the toner in a number of from 70 particles to 500 particles per 10,000 toner particles.
-
-
9. The toner according to claim 8, wherein said element A is an element selected from the group consisting of Al, Si, P, Ti, V, Cr, Mn, Co, Ni, Cu, Zn, Ga, Ge, Zr, Sn and Pb.
-
10. The toner according to claim 8, wherein said element A is an element selected from the group consisting of Al, Si, Ti, Mn and Zn.
-
11. The toner according to claim 7, wherein said magnetic material is contained in an amount of from 10 parts by weight to 200 parts by weight based on 100 parts by weight of the binder resin.
-
12. An image-forming apparatus comprising a developing means for moving a toner to an electrostatic latent image formed on a photosensitive member, to render the electrostatic latent image visible to form a toner image, and a transfer means for transferring the toner image to a transfer medium to form an image;
-
in a developer-carrying member of said developing means, at least an alternating-current bias being applied to make the toner adhere to the electrostatic latent image to form a visible image; and
said toner comprising a binder resin and a colorant;
wherein;
said toner contains as the binder resin at least a vinyl resin selected from the group consisting of;
a vinyl resin having a carboxyl group and a vinyl resin having an epoxy group;
a vinyl resin having a carboxyl group and an epoxy group; and
a vinyl resin produced by the reaction of a carboxyl group with an epoxy group; and
said toner has, in its dielectric dissipation factor (tan δ
), at least a maximum value and a minimum value in the temperature range of from 20°
C. to 150°
C., and, where the maximum value is represented by Max and the minimum value by Min, having a value of log10(Max/Min)≦
2.- View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
said element A being contained in said magnetic material in a content of from 0.1% by weight to 4.0% by weight on the basis of Fe in said magnetic material; and
said magnetic material standing liberated into the toner in a number of from 70 particles to 500 particles per 10,000 toner particles.
-
-
20. The image-forming apparatus according to claim 19, wherein said element A is an element selected from the group consisting of Al, Si, P, Ti, V, Cr, Mn, Co, Ni, Cu, Zn, Ga, Ge, Zr, Sn and Pb.
-
21. The image-forming apparatus according to claim 19, wherein said element A is an element selected from the group consisting of Al, Si, Ti, Mn and Zn.
-
22. The image-forming apparatus according to claim 18, wherein said magnetic material is contained in an amount of from 10 parts by weight to 200 parts by weight based on 100 parts by weight of the binder resin.
-
23. A process cartridge comprising:
-
an electrostatic image-bearing member, and developing means for developing an electrostatic image formed on the electrostatic image-bearing member with a toner contained therein;
the electrostatic image-bearing member and the developing means being integrally assembled to form a process cartridge, which is detachably mountable to a main assembly of the image forming apparatus; and
said toner comprising a binder resin and a colorant;
wherein;
said toner contains as the binder resin at least a vinyl resin selected from the group consisting of;
a vinyl resin having a carboxyl group and a vinyl resin having an epoxy group;
a vinyl resin having a carboxyl group and an epoxy group; and
a vinyl resin produced by the reaction of a carboxyl group with an epoxy group; and
said toner has, in its dielectric dissipation factor (tan δ
), at least a maximum value and a minimum value in the temperature range of from 20°
C. to 150°
C., and, where the maximum value is represented by Max and the minimum value by Min, having a value of log10(Max/Min)≦
2.- View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
said element A being contained in said magnetic material in a content of from 0.1% by weight to 4.0% by weight on the basis of Fe in said magnetic material; and
said magnetic material standing liberated into the toner in a number of from 70 particles to 500 particles per 10,000 toner particles.
-
-
31. The process cartridge according to claim 30, wherein said element A is an element selected from the group consisting of Al, Si, P, Ti, V, Cr, Mn, Co, Ni, Cu, Zn, Ga, Ge, Zr, Sn and Pb.
-
32. The process cartridge according to claim 30, wherein said element A is an element selected from the group consisting of Al, Si, Ti, Mn and Zn.
-
33. The process cartridge according to claim 29, wherein said magnetic material is contained in an amount of from 10 parts by weight to 200 parts by weight based on 100 parts by weight of the binder resin.
-
34. An image-forming method comprising subjecting a toner image held on a transfer medium, to heat-and-pressure fixing by a heat-and-pressure fixing means to form a fixed image on the transfer medium, wherein;
-
(1) a toner which forms the toner image is a toner comprising a binder resin and a colorant;
said toner containing as the binder resin at least a vinyl resin selected from the group consisting of;
a vinyl resin having a carboxyl group and a vinyl resin having an epoxy group;
a vinyl resin having a carboxyl group and an epoxy group; and
a vinyl resin produced by the reaction of a carboxyl group with an epoxy group; and
said toner having, in its dielectric dissipation factor (tan δ
), at least a maximum value and a minimum value in the temperature range of from 20°
C. to 150°
C., and, where the maximum value is represented by Max and the minimum value by Min, having a value of log10(Max/Min)≦
2; and
(2) as said heat-and-pressure fixing means, a heat-and-pressure fixing means is used which has at least;
(i) a magnetic field generation means;
(ii) a rotary heating member having at least a heat generation layer capable of generating heat by electromagnetic induction, and a release layer; and
(iii) a rotary pressure member which forms a nip with the heating member; and
said toner image held on said transfer medium is heat and pressure fixed while said rotary pressing member is pressed against said rotary heating member via said transfer medium. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
said element A being contained in said magnetic material in a content of from 0.1% by weight to 4.0% by weight on the basis of Fe in said magnetic material; and
said magnetic material standing liberated into the toner in a number of from 70 particles to 500 particles per 10,000 toner particles.
-
-
42. The image-forming method according to claim 41, wherein said element A is an element selected from the group consisting of Al, Si, P, Ti, V, Cr, Mn, Co, Ni, Cu, Zn, Ga, Ge, Zr, Sn and Pb.
-
43. The image-forming method according to claim 41, wherein said element A is an element selected from the group consisting of Al, Si, Ti, Mn and Zn.
-
44. The image-forming method according to claim 40, wherein said magnetic material is contained in an amount of from 10 parts by weight to 200 parts by weight based on 100 parts by weight of the binder resin.
Specification