Patent US4188215A successfully refreshed from Google Patents.
US4188215A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photosensitive printing plate, method of preparing same, and method of processing same
Assignee: Fujifilm Holdings Corp
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Filing: 1978-04-24
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Granted: 1980-02-12
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Expires: 1998-04-24
Abstract
Abstract A photosensitive printing plate with high sensitivity comprising a support having a hydrophilic surface and formed in succession thereon (1) a layer of an oleophilic photosensitive resin composition whose solubility in a solvent is changed by exposure to light to which the resin composition layer is sensitive and (2) directly on the layer (1) a layer containing a dispersion of particles of photosensitive silver halide grains coated with a water-soluble polymer in an oleophilic polymer capable of being dissolved in a developer for the photosensitive resin composition. The photosensitive printing plate is first image-wise exposed to light to which only the layer containing the silver halide is sensitive followed by silver halide development with an aqueous developer solution to form a silver image, subjected then to overall exposure using light to which the layer of the photosensitive resin composition is sensitive, and developed with a developer which dissolves the oleophilic polymer in the layer containing the silver halide and only one of either the exposed portions or the unexposed portions of the layer of the photosensitive resin composition.
Inventors
- 👤 Masamichi Sato
- 👤 Sadaharu Ikeda
- 👤 Tomoaki Ikeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:31
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/09; G03F7/095; G03F7/0952
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
164 words
A photosensitve printing plate comprising a support with a hydrophilic surface having formed in succession thereon (1) a layer of an oleophilic photosensitive resin composition which is sensitive to ultraviolet rays and wherein when the composition is exposed to ultraviolet rays a change occurs at exposed areas, whereby the exposed portions of the layer either become insoluble or soluble in a solvent, and (2) directly on said layer (1), a layer of photosensitive silver halide which is developable using an aqueous developer solution for the silver halide and comprising a dispersion of particles of photosensitive silver halide grains coated with a water soluble polymer in an oleophilic binder resin capable of being dissolved in a developer for said photosensitive resin composition, wherein the ratio of the silver halide to the water-soluble polymer, by weight, is 8:1 to 1:6 and the oleophilic binder is used in an amount of from 0.001 to 0.5 parts by weight per part by weight of the silver halide grains.
Claim 2
Dependent Claim
164 words
A photosensitve printing plate comprising a support with a hydrophilic surface having formed in succession thereon (1) a layer of an oleophilic photosensitive resin composition which is sensitive to ultraviolet rays and wherein when the composition is exposed to ultraviolet rays a change occurs at exposed areas, whereby the exposed portions of the layer either become insoluble or soluble in a solvent, and (2) directly on said layer (1), a layer of photosensitive silver halide which is developable using an aqueous developer solution for the silver halide and comprising a dispersion of particles of photosensitive silver halide grains coated with a water soluble polymer in an oleophilic binder resin capable of being dissolved in a developer for said photosensitive resin composition, wherein the ratio of the silver halide to the water-soluble polymer, by weight, is 8:1 to 1:6 and the oleophilic binder is used in an amount of from 0.001 to 0.5 parts by weight per part by weight of the silver halide grains.
Claim 3
Dependent Claim
34 words
The photosensitive printing plate of claim 1, wherein said support is a support for a metal plate, a composite metal plate, a plastic film, or a paper impregnated with or coated with a plastic.
Claim 4
Dependent Claim
16 words
The photosensitive printing plate of claim 1, wherein said photosensitive resin composition layer (1) is negative-working.
Claim 5
Dependent Claim
32 words
The photosensitive printing plate of claim 3, wherein said photosensitive resin composition layer (1) contains a compound having a diazonium salt radical, an azide compound or a compound having a cinnamoyl group.
Claim 6
Dependent Claim
16 words
The photosensitive printing plate of claim 1, wherein said photosensitive resin composition layer (1) is positive-working.
Claim 7
Dependent Claim
17 words
The photosensitive printing plate of claim 5, wherein said photosensitive resin composition layer (1) contains a 1,2-naphthoquinone-diazide.
Claim 8
Dependent Claim
28 words
The photosensitive printing plate of claim 1, wherein said silver halide grains are grains of silver chloride, silver bromide, silver iodide, silver chlorobromide, silver chloroiodide, or silver chloroiodobromide.
Claim 9
Dependent Claim
36 words
The photosensitive printing plate of claim 1, wherein said water-soluble polymer coated on said silver halide grains is gelatin, a gelatin derivative, colloidal albumin, casein, a cellulose derivative, a saccharide derivative or a synthetic water-soluble polymer.
Claim 10
Dependent Claim
69 words
The photosensitive printing plate precurser of claim 1, wherein said oleophilic polymer binder resin having said coated silver halide grains dispersed therein is a novolak type phenol resin, a polyvinyl alcohol derivative, a polymethacrylic acid resin, a copolymer of methylmethacrylate, an addition polymer containing carboxy groups in the side chains thereof, a cellulose derivative containing carboxy groups in the side chain thereof, a polyamide, a polyurethane, ethylcellulose or nitrocellulose.
Claim 11
Dependent Claim
31 words
The photosensitive printing plate precursor of claim 9, wherein said oleophilic polymer binder resin is an acrylic acid/methyl methacrylate copolymer, a styrene/acrylic acid copolymer, cellulose acetate hydrogen phthalate or polyvinyl acetate.
Claim 12
Independent Claim
147 words
A method of preparing a photosensitive printing plate which comprises coating as a layer on a hydrophilic surface of a support a solution of an oleophilic photosensitive resin composition which is sensitive to ultraviolet rays and wherein when the composition is exposed to ultraviolet rays a change occurs at exposed areas, whereby the exposed portions of the layer either become insoluble or soluble in a solvent, in a first solvent and directly coating thereon an oleophilic binder resin having dispersed therein particles of photosensitive silver halide grains coated with a water-soluble polymer in a second solvent which does not dissolve said oleophilic binder resin, wherein the ratio of the silver halide to the water-soluble polymer, by weight, is 8:1 to 1:6 and the oleophilic binder is used in an amount of from 0.001 to 0.5 parts by weight per part by weight of the silver halide grains.
Claim 13
Independent Claim
147 words
A method of preparing a photosensitive printing plate which comprises coating as a layer on a hydrophilic surface of a support a solution of an oleophilic photosensitive resin composition which is sensitive to ultraviolet rays and wherein when the composition is exposed to ultraviolet rays a change occurs at exposed areas, whereby the exposed portions of the layer either become insoluble or soluble in a solvent, in a first solvent and directly coating thereon an oleophilic binder resin having dispersed therein particles of photosensitive silver halide grains coated with a water-soluble polymer in a second solvent which does not dissolve said oleophilic binder resin, wherein the ratio of the silver halide to the water-soluble polymer, by weight, is 8:1 to 1:6 and the oleophilic binder is used in an amount of from 0.001 to 0.5 parts by weight per part by weight of the silver halide grains.
Claim 14
Independent Claim
269 words
A method of forming a printing plate which comprises imagewise exposing a photosensitive printing plate comprising a support with a hydrophilic surface having formed in succession thereon (1) a layer of an oleophilic photosensitive resin composition which is sensitive to ultraviolet rays and wherein when the composition is exposed to ultraviolet rays a change occurs at exposed areas, whereby the exposed portions of the layer either become insoluble or soluble in a solvent, and (2), directly on said layer (1), a layer of photosensitive silver halide which is developable using an aqueous developer solution for the silver halide and comprising a dispersion of particles of photosensitive silver halide grains coated with a water soluble polymer in an oleophilic binder resin capable of being dissolved in a developer for said photosensitive resin composition, wherein the ratio of the silver halide to the water-soluble polymer, by weight, is 8:1 to 1:6 and the oleophilic binder is used in an amount of from 0.001 to 0.5 parts by weight per part by weight of the silver halide grains, to light to which only said silver halide containing layer is sensitive, developing the silver halide emulsion layer using an aqueous developer solution for the silver halide to form a silver image, then subjecting the photosensitive printing plate to an overall exposure to light to which said photosensitive resin composition layer is sensitive, and then developing the photosensitive resin composition layer with a developer which dissolves the oleophilic binder resin in said silver halide containing layer and only one of either the exposed portions or the unexposed portions of said photosensitive resin composition layer.
Claim 15
Independent Claim
269 words
A method of forming a printing plate which comprises imagewise exposing a photosensitive printing plate comprising a support with a hydrophilic surface having formed in succession thereon (1) a layer of an oleophilic photosensitive resin composition which is sensitive to ultraviolet rays and wherein when the composition is exposed to ultraviolet rays a change occurs at exposed areas, whereby the exposed portions of the layer either become insoluble or soluble in a solvent, and (2), directly on said layer (1), a layer of photosensitive silver halide which is developable using an aqueous developer solution for the silver halide and comprising a dispersion of particles of photosensitive silver halide grains coated with a water soluble polymer in an oleophilic binder resin capable of being dissolved in a developer for said photosensitive resin composition, wherein the ratio of the silver halide to the water-soluble polymer, by weight, is 8:1 to 1:6 and the oleophilic binder is used in an amount of from 0.001 to 0.5 parts by weight per part by weight of the silver halide grains, to light to which only said silver halide containing layer is sensitive, developing the silver halide emulsion layer using an aqueous developer solution for the silver halide to form a silver image, then subjecting the photosensitive printing plate to an overall exposure to light to which said photosensitive resin composition layer is sensitive, and then developing the photosensitive resin composition layer with a developer which dissolves the oleophilic binder resin in said silver halide containing layer and only one of either the exposed portions or the unexposed portions of said photosensitive resin composition layer.
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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) | 1983-02-11 | 1983-08-13 | 1984-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-11 | 1987-08-13 | 1988-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-11 | 1991-08-13 | 1992-02-12 | $7700.00 | Window Closed / Lapsed |