Patent US4254209A successfully refreshed from Google Patents.
US4254209A
Expired / Lapsed
US
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Dry planographic plate with light sensitive silicone composition
Assignee: Asahi Kasei Corp
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Filing: 1979-04-16
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Granted: 1981-03-03
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Expires: 1999-04-16
Abstract
Abstract Original plates for producing dry planographic printing plates comprising (a) a support, and over and in contact with the support, (b) a light-sensitive adhesive layer made of a photopolymerizable composition comprising one or more photopolymerizable ethylenically unsaturated compounds and one or more photopolymerization initiators and overlying said light-sensitive adhesive layer, (c) a light-sensitive ink-repellent layer made of a silicone composition comprising one or more silicones, one or more photopolymerizable ethylenically unsaturated compounds and one or more photopolymerization initiators. Dry planographic printing plates can be produced from the original plates by image-wise exposing to actinic light and developing.
Inventors
- 👤 Kohki Abe
- 👤 Hiroyuki Tsuchiya
- 👤 Masayoshi Mizuno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:38
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/09; G03F7/095; G03F7/0955; G03F7/075; G03F7/0752
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
189 words
An original plate for producing dry planographic printing plates comprising: (a) a support, and over and in contact with the support, (b) a light-sensitive adhesive layer made of a photopolymerizable composition comprising one or more photopolymerizable ethylenically unsaturated compounds and one or more photopolymerization initiators, at least 30% by weight of said one or more polymerizable ethylenically unsaturated compounds being one or more photopolymerizable ethylenically unsaturated polymeric compounds having a group of the formula: ##STR10## wherein R is hydrogen or methyl, at a side chain, and being obtained by reacting a polymeric compound having free carboxyl groups at side chains with glycidyl methacrylate and/or glycidyl acrylate; and overlying said light-sensitive adhesive layer, (c) a light-sensitive ink-repellent layer made of a silicone composition consisting essentially of about 20 to 95% by weight of one or more silicones, about 5 to 80% by weight of one or more photopolymerizable ethylenically unsaturated compounds and about 0.01 to 10% by weight of one or more photopolymerization initiators; and wherein non-exposed portions of both the light-sensitive adhesive layer and the light-sensitive ink-repellent layer are removable by a solvent after image-wise exposure to actinic light.
Claim 2
Dependent Claim
189 words
An original plate for producing dry planographic printing plates comprising: (a) a support, and over and in contact with the support, (b) a light-sensitive adhesive layer made of a photopolymerizable composition comprising one or more photopolymerizable ethylenically unsaturated compounds and one or more photopolymerization initiators, at least 30% by weight of said one or more polymerizable ethylenically unsaturated compounds being one or more photopolymerizable ethylenically unsaturated polymeric compounds having a group of the formula: ##STR10## wherein R is hydrogen or methyl, at a side chain, and being obtained by reacting a polymeric compound having free carboxyl groups at side chains with glycidyl methacrylate and/or glycidyl acrylate; and overlying said light-sensitive adhesive layer, (c) a light-sensitive ink-repellent layer made of a silicone composition consisting essentially of about 20 to 95% by weight of one or more silicones, about 5 to 80% by weight of one or more photopolymerizable ethylenically unsaturated compounds and about 0.01 to 10% by weight of one or more photopolymerization initiators; and wherein non-exposed portions of both the light-sensitive adhesive layer and the light-sensitive ink-repellent layer are removable by a solvent after image-wise exposure to actinic light.
Claim 3
Dependent Claim
42 words
An original plate according to claim 1, wherein the photopolymerizable ethylenically unsaturated compound included in the photopolymerizable composition or the silicone composition has a group of the formula: ##STR11## wherein R is hydrogen or methyl, or a group of the formula: ##STR12##
Claim 4
Dependent Claim
26 words
An original plate according to claim 2, wherein the photopolymerizable ethylenically unsaturated compound included in the silicone composition is pentaerythritol tetramethacrylate, 2-hydroxyethyl methacrylate, or trimethylolpropane triacrylate.
Claim 5
Dependent Claim
41 words
An original plate according to claim 1, wherein the silicone has linear diorgano polysiloxane structure represented by the formula: ##STR13## wherein R 1 and R 2 are independently methyl, phenyl, halophenyl, vinyl, cyanoalkyl, or haloalkyl; and n is 2 or more.
Claim 6
Dependent Claim
29 words
An original plate according to claim 1, wherein the polymeric compound having free carboxyl groups at side chains is a polymer of ethylenically unsaturated compound including unsaturated carboxylic acids.
Claim 7
Dependent Claim
55 words
An original plate according to claim 5, wherein the polymeric compound having free carboxyl groups at side chains is a homopolymer of acrylic acid or methacrylic acid or a copolymer of acrylic acid or methacrylic acid and one or more compounds selected from the group consisting of styrene, acrylonitrile, an alkyl acrylate and vinyl acetate.
Claim 8
Dependent Claim
34 words
An original plate according to claim 1, wherein the thickness of the support is 0.01 to 1.0 mm, and the thicknesses of the adhesive layer and the ink-repellent layer are each 0.1 to 20μ.
Claim 9
Dependent Claim
14 words
An original plate according to claim 1, wherein the support is an aluminum plate.
Claim 10
Dependent Claim
14 words
An original plate according to claim 1, wherein the support is poly(ethylene terephthalate) film.
Claim 11
Dependent Claim
108 words
A process for producing a dry planographic printing plate which comprises subjecting an original plate for producing dry planographic printing plate comprising (a) a support, and over and in contact with the support, (b) a light-sensitive adhesive layer as defined in claim 1, and overlying said light-sensitive adhesive layer, (c) a light-sensitive ink-repellent layer as defined in claim 1 to image-wise exposure to actinic light, curing the exposed portions on the light-sensitive adhesive layer by light, and removing the unexposed portions on the light-sensitive adhesive layer and the light-sensitive ink-repellent layer to give the non-image areas on the exposed portions and the image areas on the unexposed portions.
Claim 12
Dependent Claim
94 words
A process for producing a dry planographic printing plate which comprises irradiating an original plate for producing planographic printing plate through a positive film with actinic light, said original plate comprising (a) a support, and over and in contact with the support, (b) a light-sensitive adhesive layer, and overlying said light-sensitive adhesive layer as defined in claim 1, (c) a light-sensitive ink-repellent layer as defined in claim 1, immersing the exposed original plate in a developing solvent and removing the unexposed areas from the ink-repellent layer and the adhesive layer after dissolving or swelling.
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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) | 1984-03-02 | 1984-09-01 | 1985-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-02 | 1988-09-01 | 1989-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-02 | 1992-09-01 | 1993-03-03 | $7700.00 | Window Closed / Lapsed |