US5219697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toner for developing electrostatic image comprising color resin particles having an irregular shape
Assignee: Canon Inc
•
Filing: 1991-03-08
•
Granted: 1993-06-15
•
Expires: 2011-03-08
Abstract
Abstract A toner for developing an electrostatic image, comprising color resin particles and a particulate additive. The color resin particles contain at least a coloring agent and a binding resin. The color resin particles possess irregular surfaces but not breaks, and the irregularity may be formed by depositing and fixing onto the surface fine resin particles having an average particle size in a range of 1/200 to 1/10 of the color resin particle size. A particulate additive has an average particles size of not more than 1/10 of volume average particle size of the color resin particles. The BET specific surface area of the toner changes by 20% or less before and after the forced stirring of the toner.
Inventors
- 👤 Hiromi Mori
- 👤 Takayuki Nagatsuka
- 👤 Tatsuya Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:16
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/097; G03G9/0819; G03G9/0821; G03G9/0827; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/105
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
158 words
A toner for developing an electrostatic image comprising color resin particles and a particulate additive; the color resin particles containing at least a coloring agent and a binding resin, the color resin particles or the basic spherical particles of the color resin particles having been prepared by suspension polymerization, the color resin particles having an irregular shape and being substantially free from sharp protrusions, wherein the color resin particles satisfy the following relationship in the projection chart of the color resin particle: 1.04 l≦L<2.00 l where l is the circumferential length of maximum inscribed circle of the color resin particle and L is the circumferential length of the color resin particle, the particulate additive having an average particle size of no greater than 1/10 of volume average particle size of the color resin particle; where the BET specific surface area of the toner changes by no greater than 20% before and after the forced stirring of the toner.
Claim 2
Dependent Claim
158 words
A toner for developing an electrostatic image comprising color resin particles and a particulate additive; the color resin particles containing at least a coloring agent and a binding resin, the color resin particles or the basic spherical particles of the color resin particles having been prepared by suspension polymerization, the color resin particles having an irregular shape and being substantially free from sharp protrusions, wherein the color resin particles satisfy the following relationship in the projection chart of the color resin particle: 1.04 l≦L<2.00 l where l is the circumferential length of maximum inscribed circle of the color resin particle and L is the circumferential length of the color resin particle, the particulate additive having an average particle size of no greater than 1/10 of volume average particle size of the color resin particle; where the BET specific surface area of the toner changes by no greater than 20% before and after the forced stirring of the toner.
Claim 3
Dependent Claim
35 words
The toner according to claim 1, wherein the particulate additive is mixed in an amount of 0.1 to 10 parts by weight on the basis of 100 parts by weight of the color resin particles.
Claim 4
Dependent Claim
33 words
The toner according to claim 1, wherein the particulate additive is in an amount of 0.1 to 5 parts weight on the basis of 100 parts by weight of the color resin particles.
Claim 5
Dependent Claim
34 words
The toner according to claim 1, wherein the particulate additive is in an amount of 0.1 to 2 parts by weight on the basis of 100 parts by weight of the color resin particles.
Claim 6
Dependent Claim
22 words
The toner according to claim 1, wherein the color resin particles have a volume average particle size of 2 to 20 μm.
Claim 7
Dependent Claim
22 words
The toner according to claim 1, wherein the color resin particles have a volume average particle size of 3 to 12 μm.
Claim 8
Dependent Claim
22 words
The toner according to claim 1, wherein the color resin particles have a volume average particle size of 4 to 10 μm.
Claim 9
Dependent Claim
30 words
The toner according to claim 1, wherein the BET specific surface area of the toner changes by no greater than 15% before and after the forced stirring of the toner.
Claim 10
Dependent Claim
30 words
The toner according to claim 1, wherein the BET specific surface area of the toner changes by no greater than 10% before and after the forced stirring of the toner.
Claim 11
Dependent Claim
53 words
The toner according to claim 1, wherein the color resin particles satisfy the following relationship in the projection chart of the color resin particle: 1.00<R/r≦1.20 where R in the radius of minimum circumscribed circle of the color resin particle and r is the radius of maximum inscribed circle of the color resin particle.
Claim 12
Dependent Claim
22 words
The toner according to claim 1, wherein the color resin particles are in a mixture with colloidal silica as the particulate additive.
Claim 13
Dependent Claim
23 words
The toner according to claim i, wherein the color resin particles are in a mixture with hydrophobic colloidal silica as the particulate additive.
Claim 14
Dependent Claim
23 words
The toner according to claim 1, wherein the color resin particles are in a mixture with strontium titanate particles as the particulate additive.
Claim 15
Dependent Claim
23 words
The toner according to claim 1, wherein the color resin particles are in a mixture with polyvinylidene fluoride particles as the particulate additive.
Claim 16
Dependent Claim
27 words
The toner according to claim 1, wherein the color resin particles are in a mixture with hydrophobic colloidal silica and strontium titanate particles as the particulate additive.
Claim 17
Dependent Claim
27 words
The toner according to claim 1, wherein the color resin particles are in a mixture with hydrophobic colloidal silica and polyvinylidene fluoride particles as the particulate additive.
Claim 18
Dependent Claim
28 words
The toner according to claim 1, wherein the color resin particles have irregular surfaces formed by depositing fine resin particles on the surfaces of spherical color resin particles.
Claim 19
Dependent Claim
53 words
The toner according to claim 17 wherein the color resin particles satisfy the following relationship in the projection chart of the color resin particle: 1.00<R/r≦1.20 where R is the radius of minimum circumscribed circle of the color resin particle and r is the radius of maximum inscribed circle of the color resin particle.
Claim 20
Dependent Claim
19 words
The toner according to claim 17, wherein the spherical color resin particles are prepared by a suspension polymerization process.
Claim 21
Dependent Claim
57 words
The toner according to claim 17, wherein the color resin particles are prepared by mixing spherical color resin particles with fine resin particles, thereby obtaining mixed particles, suspending the mixed particles in a liquid, and subjecting the mixture to a heat treatment, thereby immobilizing the fine resin particles on the surfaces of the spherical color resin particles.
Claim 22
Dependent Claim
44 words
The toner according to claim 20, wherein the spherical color resin particles have a volume average particle size of 2 to 20 μm and the fine resin particles have particle sizes of 1/200 to 1/10 of particle sizes of the spherical color resin particles.
Claim 23
Dependent Claim
45 words
The toner according to claim 20, wherein the spherical color resin particles have a volume average particle size of 3 to 12 μm and the fine resin particles have particle sizes of 1/200 to 1/10 of the particle sizes of the spherical color resin particles.
Claim 24
Dependent Claim
45 words
The toner according to claim 20, wherein the spherical color resin particles have a volume average particle size of 4 to 10 μm and the fine resin particles have particle sizes of 1/200 to 1/10 of the particle size of the spherical color resin particles.
Claim 25
Dependent Claim
26 words
The toner according to claim 23, wherein the fine resin particles sizes of 1/100 to 1/10 of the particle sizes of the spherical color resin particles.
Claim 26
Dependent Claim
53 words
The toner according to claim 20, wherein the color resin particles satisfy the following relationship in the projection chart of the color resin particle: 1.00<R/r≦1.20 where R is the radius of minimum circumscribed circle of the color resin particle and r is the radius of maximum inscribed circle of the color resin particle.
Claim 27
Dependent Claim
25 words
The toner according to claim 1, wherein the color resin particles are spherical particles having protuberances protruding from the surface of the basic spherical particles.
Claim 28
Dependent Claim
43 words
The toner according to claim 1, wherein the color resin particles are prepared by mixing spherical color resin particles and fine resin particles to produce mixed particles and mechanochemically fixing the fine resin particles on the surfaces of the spherical color resin particles.
Claim 29
Dependent Claim
51 words
The toner according to claim 1, wherein the color resin particles are prepared by mixing spherical color resin particles and fine resin particles to make a mixture and fixing the fine resin particles on the surfaces of the spherical color resin particles by heating the mixture in a fluidized heating bed.
Claim 30
Dependent Claim
40 words
The toner according to claim 1, wherein the color resin particles are prepared by polymerizing a monomer composition containing fine resin particles and transferring the fine resin particles to the surface of the color resin particles before completing the polymerization.
Claim 31
Dependent Claim
46 words
The toner according to claim 1, wherein the color resin particles or the basic spherical particles thereof are particles prepared by suspension polymerization, the particles containing 8-40 parts by weight of a release agent to 100 parts by weight of the resin contained in the particles.
Claim 32
Dependent Claim
44 words
The toner according to claim 1, wherein the color resin or the basic spherical particles thereof are particles prepared by suspension polymerization, the particles containing 8-40 parts by weight of paraffin wax to 100 parts by weight of the resin contained in the particles.
References Cited (Backward Citations)
US2297691A
Cited
JPS5613945A
Cited
JPS5751676A
Cited
JPS5953856A
Cited
JPS5961842A
Cited
US4868085A
Cited
US4804610A
Cited
JPS62266560A
Cited
US4912010A
Cited
JPS63301960A
Cited
US4816366A
Cited
US4960669A
Cited
US4939060A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-06-14 | 1996-12-14 | 1997-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-14 | 2000-12-14 | 2001-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-14 | 2004-12-14 | 2005-06-15 | $7700.00 | Window Closed / Lapsed |