Patent US4690886A successfully refreshed from Google Patents.
US4690886A
Expired / Lapsed
US
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Method for making negative working O-quinone diazide containing dry planographic printing plate utilizing multiply light exposure, development and basic treatment
Assignee: Fujifilm Holdings Corp
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Filing: 1985-02-13
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Granted: 1987-09-01
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Expires: 2005-02-13
Abstract
Abstract A method for making a dry planographic printing plate, which comprises: exposing through a negative transparency a dry negative working presensitized plate comprising a base substrate having provided thereon, in order, a photosensitive layer containing an orthoquinonediazide compound and a silicone rubber layer; developing the exposed plate; exposing the developed plate to light so as to make its exposure value not less than 5% of the exposure value at the time of the exposure through the negative transparency; and then treating the exposed plate with a basic compound.
Inventors
- 👤 Yasuhisa Naritomi
- 👤 Hiroshi Takahashi
- 👤 Keisuke Shiba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:09
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/26; G03F7/40; G03F7/405; G03F7/004; G03F7/022; G03F7/075; G03F7/0752
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
185 words
A method for making a dry planographic printing plate, the steps comprising: first, exposing a dry negative working presensitized plate comprising a base substrate having provided thereon, in order, a photosensitive layer containing an orthoquinonediazide compound and a silicone rubber layer to light through a negative transparency, developing the exposed printing plate by a developer consisting essentially of a mixture of (i) an alcohol selected from the group consisting of ethyl, isopropyl and n-propyl alcohol, a glycol selected from the group consisting of mono-methyl, mono-ethyl, mono-propyl or mono-n-butyl ether of ethylene glycol, or mono-methyl, mono-ethyl or mono-n-butyl ether of diethylenegylcol, and benzyl alcohol, and (ii) a petroleum solvent selected from the group consisting of hexane, heptane and isoparaffin, so that the photosensitive layer and the overlying silicone rubber layer in the exposed area are removed, exposing the whole surface of the developed printing plate to light where the exposure value is not less than 5% of the exposure value at the time of the exposure to light through the negative transparency, and treating the twice exposed printing plate with a liquid or gaseous basic compound.
Claim 2
Independent Claim
185 words
A method for making a dry planographic printing plate, the steps comprising: first, exposing a dry negative working presensitized plate comprising a base substrate having provided thereon, in order, a photosensitive layer containing an orthoquinonediazide compound and a silicone rubber layer to light through a negative transparency, developing the exposed printing plate by a developer consisting essentially of a mixture of (i) an alcohol selected from the group consisting of ethyl, isopropyl and n-propyl alcohol, a glycol selected from the group consisting of mono-methyl, mono-ethyl, mono-propyl or mono-n-butyl ether of ethylene glycol, or mono-methyl, mono-ethyl or mono-n-butyl ether of diethylenegylcol, and benzyl alcohol, and (ii) a petroleum solvent selected from the group consisting of hexane, heptane and isoparaffin, so that the photosensitive layer and the overlying silicone rubber layer in the exposed area are removed, exposing the whole surface of the developed printing plate to light where the exposure value is not less than 5% of the exposure value at the time of the exposure to light through the negative transparency, and treating the twice exposed printing plate with a liquid or gaseous basic compound.
Claim 3
Dependent Claim
13 words
The method of claim 1, wherein the photosensitive layer contains an epoxy resin.
Claim 4
Dependent Claim
42 words
The method of claim 1, wherein the whole surface of the developed printing plate is exposed to light where the exposure value is 5 to 300% of the exposure value at the time of the exposure to light through the negative transparency.
Claim 5
Dependent Claim
42 words
The method of claim 1, wherein the whole surface of the developed printing plate is exposed to light where the exposure value is 10 to 100% of the exposure value at the time of the exposure to light through the negative transparency.
Claim 6
Dependent Claim
27 words
The method of claim 1, wherein the basic compound is selected from the group consisting of amines, alkali metal alcoholates, alkali metal amides, and alkali metal hydroxides.
Claim 7
Dependent Claim
24 words
The method of claim 2, wherein the epoxy resin is a reaction product of epichlorohydrin and polyhydric phenol, or a novolak type epoxy resin.
Claim 8
Dependent Claim
28 words
The method of claim 2, wherein the amount of the epoxy resin contained in the photosensitive layer is in the range of 0 to 50 percent by weight.
Claim 9
Dependent Claim
28 words
The method of claim 2, wherein the amount of the epoxy resin contained in the photosensitive layer is in the range of 0 to 20 percent by weight.
Claim 10
Dependent Claim
18 words
The method of claim 1, wherein the orthoquinonediazide compound is 2-diazo-1-naphtholsulfonate of novolak resin or 2-diazo-1-naphtholsulfonate of polyhydroxy-phenyl.
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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) | 1990-08-31 | 1991-03-02 | 1991-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-31 | 1995-03-02 | 1995-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-31 | 1999-03-02 | 1999-09-01 | $7700.00 | Window Closed / Lapsed |