US4314013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Particle formation by double encapsulation
Assignee: Xerox Corp
•
Filing: 1979-04-04
•
Granted: 1982-02-02
•
Expires: 1999-04-04
Abstract
Abstract An improved photoelectrophorectic imaging process which comprises placing a suspension of double encapsulated electrically photosensitive particles in an electric field between a pair of surfaces, exposing the suspension to a pattern of electrogmagnetic radiation and separating the surfaces whereby the exposed portion of the suspension adheres to one surface and the unexposed portion adheres to the other surface. The imaging particles are comprised of a first resin which encapsulates a colorant for the particle and second resin which encapsulates the first resin and contains the electrically photosensitive material.
Inventors
- 👤 Yew C. Chang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:18
CPC Classifications
G; G03; G03G; G03G17/00; G03G17/04; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/101
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
128 words
In an imaging process comprising providing first and second surfaces, sandwiching between said surfaces an imaging suspension comprising electrically photosensitive particles dispersed in an electrically insulating liquid vehicle, while subjecting said suspension to an electrical field, exposing said imaging suspension to a pattern of electromagnetic radiation to which said particles are sensitive and separating the surfaces whereby the exposed particles are retained on one of said surfaces and the unexposed particles are retained on the other surface, the improvement wherein said particles comprise double encapsulated particles comprising a colorant encapsulated in a first resin and second resin encapsulating said first resin, said second resin having embedded therein electrically photosensitive material, and said first resin capable of substantially preventing dark charge injection of said photosensitive material by said colorant.
Claim 2
Dependent Claim
128 words
In an imaging process comprising providing first and second surfaces, sandwiching between said surfaces an imaging suspension comprising electrically photosensitive particles dispersed in an electrically insulating liquid vehicle, while subjecting said suspension to an electrical field, exposing said imaging suspension to a pattern of electromagnetic radiation to which said particles are sensitive and separating the surfaces whereby the exposed particles are retained on one of said surfaces and the unexposed particles are retained on the other surface, the improvement wherein said particles comprise double encapsulated particles comprising a colorant encapsulated in a first resin and second resin encapsulating said first resin, said second resin having embedded therein electrically photosensitive material, and said first resin capable of substantially preventing dark charge injection of said photosensitive material by said colorant.
Claim 3
Dependent Claim
15 words
The imaging process of claim 1 wherein the electrically photosensitive material is an organic pigment.
Claim 4
Dependent Claim
30 words
The imaging process of claim 2 wherein the electrically photosensitive material is present in the amount of from about 1% to or about 10% by weight of said second resin.
Claim 5
Dependent Claim
14 words
The imaging process of claim 2 wherein the electrically photosensitive material is metal-free phthalocyanine.
Claim 6
Dependent Claim
13 words
The process of claim 1 wherein the encapsulated colorant is a carbon black.
Claim 7
Dependent Claim
30 words
The process of claim 1 additionally containing the steps of transferring at least one said images from said surface to a receiving substrate and fixing said image on said substrate.
Claim 8
Dependent Claim
50 words
An electrically photosensitive double encapsulated particle comprising a colorant encapsulated in a first resin and second resin which encapsulates said first resin, said second resin having embedded therein electrically photosensitive material, and said first resin being capable of substantially preventing dark charge injection of said photosensitive material by said colorant.
Claim 9
Dependent Claim
50 words
An electrically photosensitive double encapsulated particle comprising a colorant encapsulated in a first resin and second resin which encapsulates said first resin, said second resin having embedded therein electrically photosensitive material, and said first resin being capable of substantially preventing dark charge injection of said photosensitive material by said colorant.
Claim 10
Dependent Claim
30 words
The particle of claim 7 wherein said electrically photosensitive material in said second resin is in the range of from about 1% to about 10% by weight of said resin.
Claim 11
Dependent Claim
16 words
The particle of claim 7 wherein said electrically photosensitive material is an organic electrically photosensitive pigment.
Claim 12
Dependent Claim
14 words
The particle of claim 9 wherein said electrically photosensitive pigment is a metal-free phthalocyanine.
Claim 13
Dependent Claim
13 words
The particle of claim 9 wherein said phthalocyanine is in the X form.
References Cited (Backward Citations)
US2940847A
Cited
US3384488A
Cited
US3384565A
Cited
US3383993A
Cited
GB1210071A
Cited
US3890240A
Cited
CA939953A
Cited
US3954640A
Cited
US4032339A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-02-01 | 1985-08-03 | 1986-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-01 | 1989-08-03 | 1990-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-01 | 1993-08-03 | 1994-02-02 | $7700.00 | Window Closed / Lapsed |