US4590142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capsule toner
Assignee: Canon Inc
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Filing: 1984-08-29
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Granted: 1986-05-20
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Expires: 2004-08-29
Abstract
Abstract A capsule toner, comprising core particles of a core material exhibiting a cloud point within the range of from 30 to 90 and a penetration within the range of from 2 to 15, and a shell material coating the core particles. The capsule toner is preferably formed by dispersing the core particles in solution of the shell material in a good solvent for the shell material, and then adding a poor solvent for the shell material to cause the deposition of the shell material on the core particles.
Inventors
- 👤 Masuo Yamazaki
- 👤 Toru Matsumoto
- 👤 Katsutoshi Wakamiya
- 👤 Ichiro Ohsaki
- 👤 Toshiaki Nakahara
- 👤 Hisayuki Ushiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:02
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/093; G03G9/0935; G03G9/09357; G03G9/09364; G03G9/09307; G03G9/09342; G03G9/09378; G03G9/09392; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2989
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
123 words
A capsule toner comprising solid core particles and a shell material coating each of said solid core particles in which said solid core particles are comprised of a core material of a wax or a mixture of waxes exhibiting a cloud point within the range of from 30 to 90 and a penetration within the range of from 2 to 15, said capsule toner being obtained by dispersing said solid core particles in a solution of a shell material in a solvent for said shell material and encapsulating each of said solid core particles with said shell material by spraying the resultant dispersion or by a phase separation method comprising adding gradually a poor solvent for said shell material into the resultant dispersion.
Claim 2
Dependent Claim
123 words
A capsule toner comprising solid core particles and a shell material coating each of said solid core particles in which said solid core particles are comprised of a core material of a wax or a mixture of waxes exhibiting a cloud point within the range of from 30 to 90 and a penetration within the range of from 2 to 15, said capsule toner being obtained by dispersing said solid core particles in a solution of a shell material in a solvent for said shell material and encapsulating each of said solid core particles with said shell material by spraying the resultant dispersion or by a phase separation method comprising adding gradually a poor solvent for said shell material into the resultant dispersion.
Claim 3
Dependent Claim
23 words
A capsule toner according to claim 1, wherein at least one of the solid core particle and the shell material contains magnetic powder.
Claim 4
Dependent Claim
65 words
A capsule toner according to claim 1, wherein the shell material is a resin selected from the group consisting of polystyrene, poly-monochlorostyrene, methacrylic acid resin, methacrylate resins, polyacrylic acid, acrylate resin, polyethylene oligomer, polyester oligomer, polyamide oligomer, polyurethane oligomer, polybutadiene, polyvinyl acetate, poly (5-ethyl-2-vinylpyridine), diethylaminoethyl methacrylic acid resin, diethylaminoethyl acrylic acid resin, poly(2-methyl-5-vinylpyridine), poly(vinylipyrrolidone), and a copolymer of constituent monomers of the polymers mentioned above.
Claim 5
Dependent Claim
27 words
A capsule toner according to claim 3, wherein the thickness of the shell material is 1 to 30% of the average particle size of the core particles.
Claim 6
Dependent Claim
108 words
A process for producing a capsule toner, which comprises (i) forming solid core particles from a core material of a wax or a mixture of waxes exhibiting a cloud point within the range of from 30 to 90 and a penetration within the range of from 2 to 15, (ii) dispersing said solid core particles in a solution of a shell material in a good solvent for said shell material, and (iii) encapsulating each of said solid core particles with said shell material by spray-drying the resultant dispersion or by a phase separation method comprising adding gradually a poor solvent for said shell material into the resultant dispersion.
Claim 7
Dependent Claim
108 words
A process for producing a capsule toner, which comprises (i) forming solid core particles from a core material of a wax or a mixture of waxes exhibiting a cloud point within the range of from 30 to 90 and a penetration within the range of from 2 to 15, (ii) dispersing said solid core particles in a solution of a shell material in a good solvent for said shell material, and (iii) encapsulating each of said solid core particles with said shell material by spray-drying the resultant dispersion or by a phase separation method comprising adding gradually a poor solvent for said shell material into the resultant dispersion.
Claim 8
Dependent Claim
64 words
A process according to claim 5, wherein the good solvent for the shell material gives a solubility at room temperature of 90 wt. % or above for the shell material and 5 wt. % or below for the core material, and the poor solvent for the shell material gives a solubility at room temperature of 5 wt. % or below for the shell material.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-19 | 1989-11-18 | 1990-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-19 | 1993-11-18 | 1994-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-19 | 1997-11-18 | 1998-05-20 | $7700.00 | Window Closed / Lapsed |