US4751165A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Imaging sheet useful in forming images on plain paper comprising photosensitive microcapsules and developer-containing
Assignee: WestRock MWV LLC
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Filing: 1987-04-06
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Granted: 1988-06-14
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Expires: 2007-04-06
Abstract
Abstract An imaging sheet useful in forming images on plain paper, said sheet comprising a support having a plurality of photosensitive microcapsules and a developer-containing resin on the surface thereof, said microcapsules and said developer-containing resin being present in the same layer or in contiguous layers on the surface of said support, said microcapsules containing an internal phase which includes a photosensitive composition which changes in viscosity in response to exposure to actinic radiation and a color former which is capable of reacting with said developer and forming a visible dye image, said imaging sheet being useful in forming images by a process which comprises image-wise exposing said imaging sheet to actinic radiation, assembling said imaging sheet with a sheet of plain paper, heating said assembly, subjecting the assembly to a uniform rupture and transfer force, and separating said imaging sheet from said paper such that said image areas are area-wise transferred to said plain paper.
Inventors
- 👤 John K. Rourke
- 👤 Joseph G. O'Connor
- 👤 Keith Colyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:46
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/002; G03F; G03F7/00; G03F7/002; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24934; Y10T428/29; Y10T428/2982; Y10T428/2984
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
171 words
An imaging sheet useful in forming images on plain paper, said sheet comprising a support having a plurality of photosensitive microcapsules and a thermoplastic developer-container resin on the surface thereof, said microcapsules and said developer-containing resin being present in the same layer or in contiguous layers on the surface of said support, said microcapsules containing an internal phase which includes a photosensitive composition which changes in viscosity in response to exposure to actinic radiation and a color former which is capable of reacting with said developer and forming a visible dye image, said imaging sheet being useful in forming images on plain paper by a process which comprises image-wise exposing said imaging sheet to actinic radiation, assembling said imaging sheet with a sheet of plain paper, heating said assembly, subjecting the assembly to a uniform rupture and transfer force, and separating said imaging sheet from said paper, wherein said image areas are area-wise transferred and adhered to said plain paper and a less grainy image having enhanced optical density is obtained.
Claim 2
Dependent Claim
171 words
An imaging sheet useful in forming images on plain paper, said sheet comprising a support having a plurality of photosensitive microcapsules and a thermoplastic developer-container resin on the surface thereof, said microcapsules and said developer-containing resin being present in the same layer or in contiguous layers on the surface of said support, said microcapsules containing an internal phase which includes a photosensitive composition which changes in viscosity in response to exposure to actinic radiation and a color former which is capable of reacting with said developer and forming a visible dye image, said imaging sheet being useful in forming images on plain paper by a process which comprises image-wise exposing said imaging sheet to actinic radiation, assembling said imaging sheet with a sheet of plain paper, heating said assembly, subjecting the assembly to a uniform rupture and transfer force, and separating said imaging sheet from said paper, wherein said image areas are area-wise transferred and adhered to said plain paper and a less grainy image having enhanced optical density is obtained.
Claim 3
Dependent Claim
57 words
The imaging sheet of claim 1 wherein said developer-containing resin is characterized in that upon heating said resin in the presence of said internal phase, said resin exhibits greater adhesion to said paper than to said support, whereas, in the absence of said internal phase, said developer resin exhibits greater adhesion for said support than said paper.
Claim 4
Dependent Claim
24 words
The imaging sheet of claim 2 wherein said developer-containing resin is further characterized in that it exhibits the properties of a hot melt adhesive.
Claim 5
Dependent Claim
14 words
The imaging sheet of claim 3 wherein said developer-containing resin is a phenolic resin.
Claim 6
Dependent Claim
20 words
The imaging sheet of claim 1 wherein said support is a polymeric film less than about 25 microns in thickness.
Claim 7
Dependent Claim
26 words
The imaging sheet of claim 2 wherein said microcapsules and said developer resin are present in admixture in a layer on the surface of said support.
Claim 8
Dependent Claim
24 words
The imaging sheet of claim 2 wherein said microcapsules and said developer resin are present in separate layers on the surface of said support.
Claim 9
Dependent Claim
22 words
The imaging sheet of claim 5 wherein said developer-containing resin is present on said support in the form of finely divided particles.
Claim 10
Dependent Claim
14 words
The imaging sheet of claim 8 wherein said developer-containing resin is a thermoplastic resin.
Claim 11
Dependent Claim
23 words
The imaging sheet of claim 2 wherein said photosensitive composition undergoes an increase in viscosity in response to its exposure to actinic radiation.
Claim 12
Dependent Claim
15 words
The imaging sheet of claim 10 wherein said photosensitive composition includes an ethylenically unsaturated compound.
Claim 13
Dependent Claim
19 words
The imaging sheet of claim 4 wherein said resin has a melting point of about 100° to 180° C.
Claim 14
Dependent Claim
159 words
A process for forming a negative transparency which comprises image-wise exposing the imaging sheet of claim 1 to actinic radiation to form latent image and non-image areas, assemblying said imaging sheet with a sheet of plain paper such that said microcapsules and said developer-containing resin are interposed between said support and said paper, heating said assembly, subjecting said assembly to a uniform force which causes said microcapsules to rupture and causes said developer-containing resin and said internal phase from said ruptured microcapsules in said image areas to adhere to the surface of said sheet of plain paper, said non-image areas remaining adhered to the support of said imaging sheet, and separating said imaging sheet from said plain paper wherein said image areas selectively adhere to said plain paper and said non-image areas remain adhered to said support of said imaging sheet such that said support of said imaging sheet with said non-image areas is useful as a negative transparency.
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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) | 1991-06-14 | 1991-12-14 | 1992-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-14 | 1995-12-14 | 1996-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-14 | 1999-12-14 | 2000-06-14 | $7700.00 | Window Closed / Lapsed |