US4797339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toner for developing electrostatic images
Assignee: Fujifilm Business Innovation Corp
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Filing: 1986-10-30
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Granted: 1989-01-10
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Expires: 2006-10-30
Abstract
Abstract A toner for developing an electrostatically charged image, comprising (A) an inner layer comprising a resin ion complex having a coloring agent and optionally a charge controlling agent and/or a magnetic material substantially dispersed therein, and (B) an outer layer containing a flowability imparting agent; and a process for producing a toner for developing an electrostatically charged image, which comprises dispersing a coloring agent and optionally a charge controlling agent and/or a magnetic substance in a resin emulsion having a charge, mixing the dispersion with a resin emulsion having an opposite charge to prepare a dispersion of a resin ion complex, adding a flowability imparting agent to the dispersion, and spray-drying the resulting dispersion.
Inventors
- 👤 Masatoshi Maruyama
- 👤 Yukinobu Hasegawa
- 👤 Toyokichi Tange
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:26
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/0825; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/105
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
53 words
A toner for developing an electrostatically charged image, comprising (A) an inner layer comprising a resin ion complex comprising a resin particle-to-particle ionically crosslinked resin complex having a coloring agent and optionally a charge controlling agent and/or a magnetic material substantially dispersed therein, and (B) an outer layer containing a flowability imparting agent.
Claim 2
Dependent Claim
53 words
A toner for developing an electrostatically charged image, comprising (A) an inner layer comprising a resin ion complex comprising a resin particle-to-particle ionically crosslinked resin complex having a coloring agent and optionally a charge controlling agent and/or a magnetic material substantially dispersed therein, and (B) an outer layer containing a flowability imparting agent.
Claim 3
Dependent Claim
18 words
The toner of claim 1 wherein the resin ion complex has a Tg of -90° to 100° C.
Claim 4
Dependent Claim
19 words
The toner of claim 1 wherein the resion ion complex has a degree of gellation of 0.5 to 50%.
Claim 5
Dependent Claim
44 words
The toner of claim 1 wherein the flowability imparting agent is a hydrophobic flowability imparting agent selected from the group consisting of hydrophobic fluorine-type resins, urethane resins, polyamide resins, aromatic condensation resins, hydrophobic inorganic oxides, clay minerals, colored dyes and pigments and surface-active agents.
Claim 6
Dependent Claim
36 words
The toner of claim 1 wherein the flowability imparting agent has the ability of control positive or negative chargeability and is a polymer of perfluoroalcohol acrylate, a fluorine-containing surface active agent, benzoguanamine-formaldehyde resin, or hydrophobic silica.
Claim 7
Dependent Claim
29 words
The toner of claim 1 which comprises 80 to 99.9% by weight of the inner layer and 20 and 20 to 0 1% by weight of the outer layer.
Claim 8
Dependent Claim
23 words
The toner of claim 1 which is substantially in the form of spherical particles having a particle diameter of 1 to 30 micrometers.
Claim 9
Dependent Claim
15 words
The toner of claim 1 which has a softening point of 60° to 200° C.
Claim 10
Dependent Claim
73 words
A process for producing a toner for developing an electrostatically charged image, which comprises dispersing a coloring agent and agent and optionally a charge controlling agent and/or magnetic substance in a resin emulsion having a charge, mixing the dispersion with a resin emulsion having an opposite charge to prepare a dispersion of a resin ion complex, aging the resulting dispersion, adding a flowability imparting agent to the dispersion, and spray-drying the resulting dispersion.
Claim 11
Dependent Claim
73 words
A process for producing a toner for developing an electrostatically charged image, which comprises dispersing a coloring agent and agent and optionally a charge controlling agent and/or magnetic substance in a resin emulsion having a charge, mixing the dispersion with a resin emulsion having an opposite charge to prepare a dispersion of a resin ion complex, aging the resulting dispersion, adding a flowability imparting agent to the dispersion, and spray-drying the resulting dispersion.
Claim 12
Dependent Claim
28 words
The process of claim 9 wherein after adding the resin emulsion having an opposite charge, the dispersion is subjected to an aging treatment at 60° to 90° C.
Claim 13
Dependent Claim
14 words
The process of claim 10 wherein the aging time is 0.5 to 2 hours.
Claim 14
Dependent Claim
40 words
The toner of claim 1 wherein the resin particle-to-particle ionically cross linked resin complex is obtained by mixing an emulsion of a cationic resin and an anionic resin in such proportions that the charges of these resins are nearly neutralized.
Claim 15
Dependent Claim
91 words
The toner of claim 12 wherein the cationic resin is a copolymer composed of (a) 90 to 20% by weight of styrene monomer, (b) 80 to 10% by weight of acrylacrylate or alkyl (meth)acrylate monomer, and (c) 0.05 to 10% by weight of cationically chargeable functional comonomer; and the anionic resin is a copolymer composed of (a') 90 to 20% by weight of styrene monomer, (b') 80 to 10% by weight of alkylacrylate or alkyl (meth) acrylate monomer, and (c') 0 0.05 to 10% by weight of anionically chargeable functional comonomer.
Claim 16
Dependent Claim
32 words
The toner of claim 13 wherein the copolymer of the cationic resin emulsion and the copolymer of the anionic resin emulsion each have average particle diameter of from 0.05 to 1 micron.
Claim 17
Dependent Claim
30 words
The toner of claim 1 wherein the resin ion complex has a Tg of -50° C. to 80° C. and a degree of gellation of 5 to 30% by weight.
Claim 18
Dependent Claim
26 words
The toner of claim 1 which comprises 95 to 99.5% by weight of the inner layer and 5.0 to 0.5% by weight of the outer layer.
Claim 19
Dependent Claim
20 words
The toner of claim 1 wherein the inner layer comprises the resin ion complex, coloring agent and charge controlling agent.
Claim 20
Dependent Claim
19 words
The toner of claim 1 wherein the inner layer comprises the resin ion complex, coloring agent and magnetic material.
Claim 21
Dependent Claim
22 words
The toner of claim 1 wherein the inner layer comprises the resin ion complex, coloring agent, charge controlling agent and magnetic material.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-10 | 1992-07-11 | 1993-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-10 | 1996-07-11 | 1997-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-10 | 2000-07-11 | 2001-01-10 | $7700.00 | Window Closed / Lapsed |