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US4675268A
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US
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Process for transfer of a toner image utilizing a magnetic toner containing a binder resin and having gradual softening characteristics
Assignee: Konica Minolta Inc
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Filing: 1986-03-11
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Granted: 1987-06-23
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Expires: 2006-03-11
Abstract
Abstract This invention relates to a magnetic toner (3b) composed mainly of a magnetic material and a binder resin, in which the difference between the softening point and the softening initiation temperature of said magnetic toner (3b) is made 5° C. or more to provide a magnetic toner (3b) which is suitable for pressing transfer, particularly pressing transfer by use of an intermediate transfer member and capable of giving stable running characteristics without causing off-set phenomenon according to a conventional developing system without use of no special developing system and regardless of the photosensitive member employed as well as good image quality on a plain paper.
Inventors
- 👤 Ken-ichi Kishi
- 👤 Kenzi Tuzita
- 👤 Tuneo Daidoji
- 👤 Yuki Okuyama
- 👤 Kiyoshi Kimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:07
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/14; G03G13/16; G03G9/00; G03G9/08; G03G9/083; G03G9/0836; G03G9/087; G03G9/08784; G03G9/08795; G03G9/09; G03G9/0902; G03G9/0904
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
128 words
A process for pressing transfer of a toner image utilizing an intermediate transfer member comprising the sequential steps of: (i) forming toner image by a magnetic toner on a photosensitive member, (ii) transferring said toner image onto an intermediate transfer member positioned between said photosensitive member and a final transfer member by pressing transfer, and then (iii) transferring and simultaneously thermally fixing said toner image onto said final transfer member by pressing transfer, wherein said toner comprises a magnetic material and a binder resin and is characterized in that the difference between the softening point and the softening initiating temperature of said toner being 5° C. or more and by having an electroconductivity of 10 -4 to 10 -2 /cm in a direct current field of 1000 V/cm.
Claim 2
Dependent Claim
128 words
A process for pressing transfer of a toner image utilizing an intermediate transfer member comprising the sequential steps of: (i) forming toner image by a magnetic toner on a photosensitive member, (ii) transferring said toner image onto an intermediate transfer member positioned between said photosensitive member and a final transfer member by pressing transfer, and then (iii) transferring and simultaneously thermally fixing said toner image onto said final transfer member by pressing transfer, wherein said toner comprises a magnetic material and a binder resin and is characterized in that the difference between the softening point and the softening initiating temperature of said toner being 5° C. or more and by having an electroconductivity of 10 -4 to 10 -2 /cm in a direct current field of 1000 V/cm.
Claim 3
Dependent Claim
32 words
The process of claim 1, wherein said intermediate transfer member has a surface selected from the group consisting of natural rubber, urethane rubber, styrene-butadiene rubber, silicone rubber, ethylene-propylene rubber and fluorine rubber.
Claim 4
Dependent Claim
20 words
The process of claim 1, wherein said softening point is within the range of from 80° C. to 170° C.
Claim 5
Dependent Claim
20 words
The process of claim 3, wherein the fixing temperature is within the range of ±50° C. of said softening point.
Claim 6
Dependent Claim
32 words
The process of claim 4, wherein said intermediate transfer member has a surface selected from the group consisting of natural rubber, urethane rubber, styrene-butadiene rubber, silicone rubber, ethylene-propylene rubber and fluorine rubber.
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) | 1990-06-22 | 1990-12-22 | 1991-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-22 | 1994-12-22 | 1995-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-22 | 1998-12-22 | 1999-06-23 | $7700.00 | Window Closed / Lapsed |