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US4282308A
Expired / Lapsed
US
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Negative-working multilayer photosensitive element
Assignee: EIDP Inc
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Filing: 1980-06-26
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Granted: 1981-08-04
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Expires: 2000-06-26
Abstract
Abstract An improved peel apart photosensitive element comprises a strippable cover sheet, a photoadherent layer, and a tacky, nonphotosensitive contiguous layer receptive to colorant or particulate material, and a support. The element is useful in applications such as color proofing. Such elements are capable of producing reverse toned or colored images as well as duplicate colored images with greatly improved tonal range and image fidelity.
Inventors
- 👤 Abraham B. Cohen
- 👤 Roxy N. Fan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:48
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/26; G03F7/34; G03F3/00; G03F3/10; G03F3/103
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
107 words
A peel apart photosensitive element comprising in order from top to bottom, (1) a strippable cover sheet comprised of a polymeric film which is transparent to actinic radiation, (2) a photoadherent layer containing a colorant and comprising a photohardenable material with ethylenically unsaturated or benzophenone type groups, (3) a nonphotosensitive organic contiguous layer, and (4) a sheet support, wherein, after exposure to actinic radiation, the peel force required to remove the cover sheet (1) with the exposed photoadherent layer (2) thereon from the contiguous layer (3) is at least four times the peel force required to remove the cover sheet (1) from an unexposed photoadherent layer (2).
Claim 2
Dependent Claim
107 words
A peel apart photosensitive element comprising in order from top to bottom, (1) a strippable cover sheet comprised of a polymeric film which is transparent to actinic radiation, (2) a photoadherent layer containing a colorant and comprising a photohardenable material with ethylenically unsaturated or benzophenone type groups, (3) a nonphotosensitive organic contiguous layer, and (4) a sheet support, wherein, after exposure to actinic radiation, the peel force required to remove the cover sheet (1) with the exposed photoadherent layer (2) thereon from the contiguous layer (3) is at least four times the peel force required to remove the cover sheet (1) from an unexposed photoadherent layer (2).
Claim 3
Dependent Claim
38 words
An element according to claim 1, after imagewise exposure and stripping of the cover sheet (1), the cover sheet bears on its surface the colored exposed image areas complementary to the image areas remaining on the contiguous layer.
Claim 4
Dependent Claim
54 words
An overlay which comprises, in combination, at least two elements according to claim 2, in register with each other, characterized that each element has been exposed through a different color separation negative and the respective photoadherent layers have been colored in a spectral region corresponding to the color separation negative used for the exposure.
Claim 5
Dependent Claim
21 words
An overlay according to claim 3 wherein the elements and colored separation negatives correspond, respectively, to black, yellow, magenta and cyan.
Claim 6
Dependent Claim
13 words
An element according to claim 1 wherein the contiguous layer (3) is colorless.
Claim 7
Dependent Claim
28 words
An element according to claim 1 wherein the photoadherent layer (2) is comprised of an ethylenically unsaturated photohardenable material selected from photopolymerizable, photocrosslinkable, photodimerizable compositions and combinations thereof.
Claim 8
Dependent Claim
17 words
An element according to claim 1 wherein the contiguous layer (3) is comprised of an elastomeric material.
Claim 9
Dependent Claim
26 words
An element according to claim 1 wherein the strippable cover sheet (1) is a polymeric film which is surface treated by electrostatic discharge or flame treatment.
Claim 10
Dependent Claim
35 words
An element according to claim 1 wherein the sheet support (4) is contiguous to layer (3) and is taken from the group consisting of a film support and a film support bearing an auxiliary layer.
Claim 11
Dependent Claim
55 words
An element according to claim 6 wherein the photohardenable layer (2) is a nontacky photopolymerizable layer comprised of a macromolecular organic polymeric binder, an organic compound having at least one terminal ethylenic group capable of free radical initiated, chain propagated addition polymerization, and a free radical generating addition polymerization photoinitiating system activatable by actinic radiation.
Claim 12
Dependent Claim
15 words
An element according to claim 1 wherein the contiguous layer (3) contains an added colorant.
Claim 13
Dependent Claim
20 words
An element according to claim 9 wherein the auxiliary layer is interposed between contiguous layer (3) and sheet support (4).
Claim 14
Dependent Claim
14 words
An element according to claim 12 wherein the auxiliary layer is a release layer.
Claim 15
Dependent Claim
14 words
An element according to claim 12 wherein the auxiliary layer is an anchoring layer.
Claim 16
Dependent Claim
12 words
An element according to claim 12 wherein the auxiliary layer is thermoplastic.
References Cited (Backward Citations)
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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) | 1984-08-03 | 1985-02-02 | 1985-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-03 | 1989-02-02 | 1989-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-03 | 1993-02-02 | 1993-08-04 | $7700.00 | Window Closed / Lapsed |