US3982938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoconductive toners which include photoconductive pigment particles in a charge-transporting insulating binder
Assignee: Fujifilm Holdings Corp
•
Filing: 1974-02-12
•
Granted: 1976-09-28
•
Expires: 1994-02-12
Abstract
Abstract Improved toner particles each comprising an intimate mixture of a photoconductive pigment and an insulating binder capable of transporting charge carriers when the charge carriers are injected therein from the pigment, the proportion of the total volume of the pigment in the toner particle being 2 to 30 volume percent of the toner particle and the insulating binder being substantially transparent to the light in the region of the spectrum to which the pigment is sensitive. The toner particle may have therein a core or cores of a material which is substantially transparent to the light in the spectral-sensitive region of the pigment. The toner particles have improved surface durability and can be used repeatedly.
Inventors
- 👤 Satoru Honjo
- 👤 Hajime Miyatuka
- 👤 Seiji Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:17
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/09; G03G9/0926; G03G5/00; G03G5/02; G03G5/04; G03G9/0825; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/101
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
106 words
Photoconductive toner particles, each particle consisting of a mixture of photoconductive pigment particles and a charge-transporting insulating binder within which is dispersed said photoconductive pigment particles, said insulating binder being capable of transporting charge carriers when the charge carriers are injected therein from said pigment and being selected from the group consisting of (a) resins sensitized by a Lewis acid, (b) resins having organic photoconductive material dissolved therein and (c) organic photoconductive polymers, the volume of said pigment in said toner being 2 to 30 volume percent of said toner and said charge-transporting binder being substantially transparent to light in the spectrally-sensitive region of said pigment.
Claim 2
Dependent Claim
106 words
Photoconductive toner particles, each particle consisting of a mixture of photoconductive pigment particles and a charge-transporting insulating binder within which is dispersed said photoconductive pigment particles, said insulating binder being capable of transporting charge carriers when the charge carriers are injected therein from said pigment and being selected from the group consisting of (a) resins sensitized by a Lewis acid, (b) resins having organic photoconductive material dissolved therein and (c) organic photoconductive polymers, the volume of said pigment in said toner being 2 to 30 volume percent of said toner and said charge-transporting binder being substantially transparent to light in the spectrally-sensitive region of said pigment.
Claim 3
Dependent Claim
30 words
The photoconductive toner particles as set forth in claim 1, in which said insulating binder has an absorption coefficient of less than 1.3 × 10 2 mm - 1 .
Claim 4
Dependent Claim
25 words
The photoconductive toner particles as set forth in claim 1, in which said insulating binder contains more than 5 weight percent of a Lewis acid.
Claim 5
Dependent Claim
32 words
The photoconductive toner particles as set forth in claim 3, in which said Lewis acid is 2,4,7-trinitro-9-fluorenone, 2,4,5,7-tetranitro-9-fluorenone, picric acid, 1,3,5-trinitrobenzene, chloranil, 4,4-bis(dimethylamino)benzophenone, tetrachlorophthalic anhydride, benzanthracene-7,72-dione, tetracyanobenzoquinodimethane, tetracyanoethylene, or a mixture thereof.
Claim 6
Dependent Claim
98 words
Photoconductive toner particles, each particle comprising a mixture of a photoconductive pigment and an insulating binder within which is dispersed said photoconductive pigment particles, said insulating binder being capable of transporting charge carriers when the charge carriers are injected therein from said pigment, the volume of said pigment being 2 to 43 parts by volume per 100 parts by volume of said binder and said binder comprising a surface layer substantially transparent to light in the spectrally-sensitive region of said pigment and at least one core material substantially transparent to light in the spectrally-sensitive region of said pigment.
Claim 7
Dependent Claim
98 words
Photoconductive toner particles, each particle comprising a mixture of a photoconductive pigment and an insulating binder within which is dispersed said photoconductive pigment particles, said insulating binder being capable of transporting charge carriers when the charge carriers are injected therein from said pigment, the volume of said pigment being 2 to 43 parts by volume per 100 parts by volume of said binder and said binder comprising a surface layer substantially transparent to light in the spectrally-sensitive region of said pigment and at least one core material substantially transparent to light in the spectrally-sensitive region of said pigment.
Claim 8
Dependent Claim
30 words
The photoconductive toner particles as set forth in claim 5, in which said insulating binder has an absorption coefficient of less than 1.3 × 10 2 mm - 1 .
Claim 9
Dependent Claim
25 words
The photoconductive toner particles as set forth in claim 5, in which said insulating binder contains more than 5 weight percent of a Lewis acid.
Claim 10
Dependent Claim
32 words
The photoconductive toner particles as set forth in claim 7, in which said Lewis acid is 2,4,7-trinitro-9-fluorenone, 2,4,5,7-tetranitro-9-fluorenone, picric acid, 1,3,5-trinitrobenzene, chloranil, 4,4-bis(dimethylamino)benzophenone, tetrachlorophthalic anhydride, benzanthracene-7,12-dione, tetracyanobenzoquinodimethane, tetracyanoethylene or a mixture thereof.
Claim 11
Dependent Claim
24 words
The photoconductive toner particles as set forth in claim 5, in which said core material is a plastic, glass, ceramic, or a hydrocarbon vapor.
Claim 12
Dependent Claim
37 words
The photoconductive toner particles as set forth in claim 5, in which the volume of the mixture of said photoconductive pigment and said insulating binder in said toner is 0.01 to 75 volume percent of said toner.
Claim 13
Dependent Claim
138 words
In a process for recording images, comprising forming a layer of charged photoconductive toner particles on a conductive support, image exposing said layer to thereby dissipate the charge at the exposed area, removing those toner particles which have a reduced electrostatic attractive force for the support, recovering said removed particles and using in said process repeatedly, the improvement wherein said toner is a photoconductive toner each particle comprising a mixture of a photoconductive pigment particles and an insulating binder within which is dispersed said photoconductive pigment particles, said insulating binder being capable of transporting charge carriers when the charge carriers are injected therein from said pigment, the volume of said pigment in said toner being 2 to 30 volume percent of said toner and said binder being substantially transparent to light in the spectrally-sensitive region of said pigment.
Claim 14
Dependent Claim
138 words
In a process for recording images, comprising forming a layer of charged photoconductive toner particles on a conductive support, image exposing said layer to thereby dissipate the charge at the exposed area, removing those toner particles which have a reduced electrostatic attractive force for the support, recovering said removed particles and using in said process repeatedly, the improvement wherein said toner is a photoconductive toner each particle comprising a mixture of a photoconductive pigment particles and an insulating binder within which is dispersed said photoconductive pigment particles, said insulating binder being capable of transporting charge carriers when the charge carriers are injected therein from said pigment, the volume of said pigment in said toner being 2 to 30 volume percent of said toner and said binder being substantially transparent to light in the spectrally-sensitive region of said pigment.
Claim 15
Dependent Claim
29 words
Photoconductive toner particles as in claim 11 where said organic photoconductive polymers are sensitized by a sensitizer selected from the group consisting of a sensitizing dye and Lewis acid.
Claim 16
Dependent Claim
17 words
Photoconductive toner particles as in claim 1 where said photoconductive pigment particles are sensitized with a sensitizer.
Claim 17
Dependent Claim
32 words
Photoconductive toner particles as in claim 13 where said sensitizer is selected from the group consisting of xanthene dyes, phthalein dyes, triphenylmethane dyes, anthraquinone dyes, azo dyes, cyanine dyes, and merocyanine dyes.
References Cited (Backward Citations)
US3140175A
Cited
US3143508A
Cited
US3060020A
Cited
US2986521A
Cited
GB1165017A
Cited
US3775103A
Cited
US3820984A
Cited
US3825421A
Cited
US3764315A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-28 | 1980-03-29 | 1980-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-28 | 1984-03-29 | 1984-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-28 | 1988-03-29 | 1988-09-28 | $7700.00 | Window Closed / Lapsed |