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US4357416A
Expired / Lapsed
US
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Process for preparation of multilayer photosensitive solvent-processable litho element
Assignee: EIDP Inc
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Filing: 1981-08-26
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Granted: 1982-11-02
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Expires: 2001-08-26
Abstract
Abstract An improved photosensitive litho element comprises, in order, a support, a non-photosensitive solvent-soluble contiguous layer having an optical density of at least 3.0 in the visible region of the spectrum and a maximum thickness of 0.015 mm, and a solvent-processable photosensitive layer. Dot-etchable contact litho negatives and positives are provided.
Inventors
- 👤 Roxy Fan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:31
CPC Classifications
G; G03; G03F; G03F1/00; G03F1/54; G03F1/56
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
110 words
An image reproduction process which comprises imagewise exposing to actinic radiation a photosensitive litho element having in order from bottom to top a sheet support, a nonphotosensitive, solvent-soluble dye or pigment-containing layer having an optical density of at least 3.0 in the visible region of the spectrum and a maximum thickness of 0.015 mm, a solvent-processable nonsilver halide photosensitive layer, and optionally a cover sheet or overcoat layer; removing the cover sheet or overcoat layer, if present, washing out either the exposed or unexposed areas of the solvent-processable photosensitive layer and simultaneously or subsequently washing out the nonphotosensitive layer in the areas from which the photosensitive layer had been removed.
Claim 2
Dependent Claim
110 words
An image reproduction process which comprises imagewise exposing to actinic radiation a photosensitive litho element having in order from bottom to top a sheet support, a nonphotosensitive, solvent-soluble dye or pigment-containing layer having an optical density of at least 3.0 in the visible region of the spectrum and a maximum thickness of 0.015 mm, a solvent-processable nonsilver halide photosensitive layer, and optionally a cover sheet or overcoat layer; removing the cover sheet or overcoat layer, if present, washing out either the exposed or unexposed areas of the solvent-processable photosensitive layer and simultaneously or subsequently washing out the nonphotosensitive layer in the areas from which the photosensitive layer had been removed.
Claim 3
Dependent Claim
17 words
A process according to claim 1 wherein the unexposed areas of the photosensitive layer are solvent soluble.
Claim 4
Dependent Claim
12 words
A process according to claim 2 wherein the photosensitive layer is photohardenable.
Claim 5
Dependent Claim
16 words
A process according to claim 1 wherein the exposed areas of the photosensitive layer are solvent-soluble.
Claim 6
Dependent Claim
12 words
A process according to claim 4 wherein the photosensitive layer is photodesensitizable.
Claim 7
Dependent Claim
12 words
A process according to claim 4 wherein the photosensitive layer is photosolubilizable.
Claim 8
Dependent Claim
12 words
A process according to claim 1 wherein the photosensitive layer is aqueous-processable.
Claim 9
Dependent Claim
19 words
A process according to claim 1 wherein the nonphotosensitive layer is soluble in a solvent for the photosensitive layer.
Claim 10
Dependent Claim
16 words
A process according to claim 1 wherein the nonphotosensitive layer is soluble in an aqueous solution.
Claim 11
Dependent Claim
18 words
A process according to claim 1 wherein the optical density of the nonphotosensitive layer is at least 4.0.
Claim 12
Dependent Claim
19 words
A process according to claim 1 wherein the thickness of the nonphotosensitive layer ranges from 0.0011 to 0.015 mm.
Claim 13
Dependent Claim
16 words
A process according to claim 1 wherein the thickness of the nonphotosensitive layer is 0.010 mm.
Claim 14
Dependent Claim
12 words
A process according to claim 1 wherein the nonphotosensitive layer is nonelastomeric.
Claim 15
Dependent Claim
29 words
A process according to claim 1 wherein the size of the image areas is reduced by undercutting the image areas by means of a solvent therefor and mechanical action.
Claim 16
Dependent Claim
15 words
A process according to claim 14 wherein the mechanical action is rubbing, brushing or spraying.
Claim 17
Dependent Claim
30 words
A process according to claim 1 wherein the litho element has a removable cover sheet or overcoat layer which is removed prior to removing the areas of the photosensitive layer.
Claim 18
Dependent Claim
29 words
A process according to claim 1 wherein the element has an overcoat layer which is completely or partially removed during the removal of the areas of the photosensitive layer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-01 | 1986-05-03 | 1986-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-01 | 1990-05-03 | 1990-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-01 | 1994-05-03 | 1994-11-02 | $7700.00 | Window Closed / Lapsed |