Patent US3945532A successfully refreshed from Google Patents.
Patent US4599289A successfully refreshed from Google Patents.
US4599289A
Expired / Lapsed
US
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Pressure-fixable encapsulated toner
Assignee: Canon Inc
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Filing: 1985-03-22
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Granted: 1986-07-08
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Expires: 2005-03-22
Abstract
Abstract A pressure-fixable encapsulated toner each capsule of which comprises a core containing a pressure-fixable component and a shell entirely or partially covering the core, characterized in that the shell comprises a copolymer of 95-70% by weight of vinylidene chloride and 5-30% by weight of acrylonitrile. This encapsulated toner is excellent in the covering property of the shell, is easy to prepare, and exhibits good stable triboelectrical chargeability, developing ability, and pressure fixability to plain paper, during many repeated service operations.
Inventors
- 👤 Koushi Suematsu
- 👤 Tetsuo Hasegawa
- 👤 Ichiro Osaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:04
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/0825; G03G9/093; G03G9/09307; G03G9/09314; G03G9/09321; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
51 words
A pressure-fixable encapsulated toner, comprising a pressure fixable polyolefin core containing a colorant and a shell entirely covering the core, the shell comprising a copolymer of 95 to 70% by weight of vinylidene chloride and 5 to 30% by weight of acrylonitrile, the weights based on the weight of the copolymer.
Claim 2
Dependent Claim
51 words
A pressure-fixable encapsulated toner, comprising a pressure fixable polyolefin core containing a colorant and a shell entirely covering the core, the shell comprising a copolymer of 95 to 70% by weight of vinylidene chloride and 5 to 30% by weight of acrylonitrile, the weights based on the weight of the copolymer.
Claim 3
Dependent Claim
11 words
The toner of claim 1, wherein the colorant is carbon black.
Claim 4
Dependent Claim
12 words
The toner of claim 1, wherein the colorant is fine magnetic particles.
Claim 5
Dependent Claim
10 words
The toner of claim 1, wherein the polyolefin is polyethylene.
Claim 6
Dependent Claim
11 words
The toner of claim 1, which is mixed with powdered iron.
Claim 7
Dependent Claim
90 words
A pressure-fixable encapsulated toner, comprising a pressure fixable polyolefin core containing a colorant and a shell entirely covering the core, the shell comprising a copolymer of 95 to 70% by weight of vinylidene chloride and 5 to 30% by weight of acrylonitrile based on the weight of the copolymer and a polystyrene family resin selected from the group consisting of homopolymers and copolymers of styrene or its derivatives, wherein the weight ratio of the vinylidene chloride-acrylonitrile copolymer to the polystyrene family resin is in the range of 1:1 to 20:1.
Claim 8
Dependent Claim
90 words
A pressure-fixable encapsulated toner, comprising a pressure fixable polyolefin core containing a colorant and a shell entirely covering the core, the shell comprising a copolymer of 95 to 70% by weight of vinylidene chloride and 5 to 30% by weight of acrylonitrile based on the weight of the copolymer and a polystyrene family resin selected from the group consisting of homopolymers and copolymers of styrene or its derivatives, wherein the weight ratio of the vinylidene chloride-acrylonitrile copolymer to the polystyrene family resin is in the range of 1:1 to 20:1.
Claim 9
Dependent Claim
12 words
The toner of claim 6, wherein the polystyrene family resin is polystyrene.
Claim 10
Dependent Claim
19 words
The toner of claim 6, wherein the polystyrene family resin is a copolymer prepared from styrene and acrylic monomer.
Claim 11
Dependent Claim
11 words
The toner of claim 6, wherein the colorant is carbon black.
Claim 12
Dependent Claim
12 words
The toner of claim 6, wherein the colorant is fine magnetic particles.
Claim 13
Dependent Claim
10 words
The toner of claim 6, wherein the polyolefin is polyethylene.
Claim 14
Dependent Claim
11 words
The toner of claim 6, which is mixed with powdered iron.
Claim 15
Dependent Claim
55 words
An electrophotographic process for developing an electrostatic latent image, comprising: forming an electrostatic latent image on a photoconductive layer; developing the latent image with a pressure-fixable encapsulated toner of claim 1 to obtain a toner image; transferring the obtained toner image onto a transfer medium; and fixing the transferred toner image thereon by applying pressure.
Claim 16
Dependent Claim
19 words
The process of claim 13, wherein the transferred toner image thereon is fixed by applying pressure and supplemental heating.
Claim 17
Dependent Claim
55 words
An electrophotographic process for developing an electrostatic latent image, comprising: forming an electrostatic latent image on a photoconductive layer; developing the latent image with a pressure-fixable encapsulated toner of claim 6 to obtain a toner image; transferring the obtained toner image onto a transfer medium; and fixing the transferred toner image thereon by applying pressure.
Claim 18
Dependent Claim
19 words
The process of claim 15, wherein the transferred toner image thereon is fixed by applying pressure and supplemental heating.
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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) | 1989-07-07 | 1990-01-06 | 1990-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-07 | 1994-01-06 | 1994-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-07 | 1998-01-06 | 1998-07-08 | $7700.00 | Window Closed / Lapsed |