US4988591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing color images
Assignee: Hoechst AG
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Filing: 1989-05-04
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Granted: 1991-01-29
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Expires: 2009-05-04
Abstract
Abstract A process for producing color images electrophotographically by means of toner image transfer, wherein toner images of different colors are successively transferred to an adhesive layer with application of pressure, is disclosed. The process produces colored copy true to the original, and is particularly useful for producing images for film proofing methods.
Inventors
- 👤 Detlef Winkelmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:17
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/12; G03F; G03F3/00; G03F3/10; G03F3/105; G03G13/00; G03G13/01
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
125 words
A process for producing screened color images electrophotographically for the color proofing method by means of toner image transfer, which comprises the steps of (a) providing an adhesive material comprising a base and a multi-ply adhesive layer with at least one more strongly adhering layer and at least one less strongly adhering layer, (b) transferring a plurality of toner images of different colors successively from a photoconductor to said adhesive layer with application of pressure by a pair of rollers exerting a linear pressure in the range from about 10 N/cm to 200 N/cm, (c) transferring said adhesive layer together with said plurality of toners of different colors adhering thereto to a final receiving material, and (d) peeling off said base from said adhesive layer.
Claim 2
Dependent Claim
125 words
A process for producing screened color images electrophotographically for the color proofing method by means of toner image transfer, which comprises the steps of (a) providing an adhesive material comprising a base and a multi-ply adhesive layer with at least one more strongly adhering layer and at least one less strongly adhering layer, (b) transferring a plurality of toner images of different colors successively from a photoconductor to said adhesive layer with application of pressure by a pair of rollers exerting a linear pressure in the range from about 10 N/cm to 200 N/cm, (c) transferring said adhesive layer together with said plurality of toners of different colors adhering thereto to a final receiving material, and (d) peeling off said base from said adhesive layer.
Claim 3
Dependent Claim
23 words
The process as claimed in claim 1, wherein said adhesive layer comprises a pressure-sensitive adhesive mass, a contact adhesive or a hot-melt adhesive.
Claim 4
Dependent Claim
18 words
The process as claimed in claim 1, wherein said adhesive layer has a thickness of about 4-40 μm.
Claim 5
Dependent Claim
29 words
The process as claimed in claim 1, wherein said adhesive layer is a multi-ply adhesive layer of which the ply in contact with the base is the least tacky.
Claim 6
Dependent Claim
35 words
The process as claimed in claim 1, wherein said adhesive layer is a multi-ply adhesive layer of which the tackiness of the top ply is sufficiently low that said ply is dry to the touch.
Claim 7
Dependent Claim
14 words
The process as claimed in claims 1, wherein said adhesive layer is photochemically reactive.
Claim 8
Dependent Claim
16 words
The process as claimed in claim 1, wherein said adhesive layer is fully curable by photopolymerization.
Claim 9
Dependent Claim
15 words
The process as claimed in claim 1, wherein said base is a transparent two-dimensional base.
Claim 10
Dependent Claim
23 words
The process as claimed in claim 1, wherein said adhesive material further comprises a release layer between said base and said adhesive layer.
Claim 11
Dependent Claim
21 words
The process as claimed in claim 1, wherein said adhesive material is an adhesive film which comprises a polyester film base.
Claim 12
Dependent Claim
33 words
The process as claimed in claim 1, wherein said adhesive layer together with said plurality of toners of different colors adhering thereto is transferred by means of heat to said final receiving material.
Claim 13
Dependent Claim
22 words
The process as claimed in claim 1, further comprising the step of fully curing said adhesive layer by exposure to UV radiation.
Claim 14
Dependent Claim
71 words
The process as claimed in claim 1, further comprising the steps of providing a plurality of screened color separations of a color image, exposing said photoconductor imagewise under each of said plurality of screened color separations to produce a corresponding latent charge image, and developing each of said latent charge images, using a toner which is dyed in a standard color for multi-color printing, to produce said plurality of toner images.
Claim 15
Dependent Claim
19 words
The process as claimed in claim 1, wherein said final receiving material is a paper sheet for multi-color printing.
Claim 16
Dependent Claim
16 words
The process as claimed in claim 1, wherein said photoconductor carries a thin, adhesion-reducing top layer.
Claim 17
Dependent Claim
10 words
A color image produced using the process of claim 1.
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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) | 1994-01-28 | 1994-07-30 | 1995-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-28 | 1998-07-30 | 1999-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-28 | 2002-07-30 | 2003-01-29 | $7700.00 | Window Closed / Lapsed |