Patent US4296194A successfully refreshed from Google Patents.
US4296194A
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Positive-working light sensitive diazo materials with azo dye
Assignee: Agfa Gevaert NV
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Filing: 1980-02-19
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Granted: 1981-10-20
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Expires: 2000-02-19
Abstract
Abstract A positive working light-sensitive composition comprises in admixture (a) a first component which is an azo dye formed by reacting a p-amino-benzene diazonium salt and a compound including the grouping ##STR1## and (b) a second component which includes a o-quinone diazide and/or a diazonium compound and which, on exposure to light produces an acidic light decomposition product which is capable of reacting with the azo dye to produce a material having a color different to that of the azo dye. The composition exhibits a color change on exposure to light and is useful for the manufacture of light sensitive plates for use in lithographic printing plate production.
Inventors
- 👤 Terence Harper
- 👤 Allen P. Gates
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:15
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/09; G03F7/105
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
100 words
A positive working light-sensitive composition which exhibits a colour change upon exposure to light, which composition comprises in admixture (a) a first component which is an azo dye formed by reacting a p-aminobenzene diazonium salt and a compound selected from 3-hydroxy-2-naphthoic acid and acid derivatives thereof and (b) a second component which includes a non-light sensitive polymer and and o-quinone diazide and/or a diazonium compound and which, on exposure to light, produces an acidic light decomposition product which is capable of reacting with the azo dye to produce a material having a colour different to that of the azo dye.
Claim 2
Dependent Claim
100 words
A positive working light-sensitive composition which exhibits a colour change upon exposure to light, which composition comprises in admixture (a) a first component which is an azo dye formed by reacting a p-aminobenzene diazonium salt and a compound selected from 3-hydroxy-2-naphthoic acid and acid derivatives thereof and (b) a second component which includes a non-light sensitive polymer and and o-quinone diazide and/or a diazonium compound and which, on exposure to light, produces an acidic light decomposition product which is capable of reacting with the azo dye to produce a material having a colour different to that of the azo dye.
Claim 3
Dependent Claim
51 words
A composition as claimed in claim 1 wherein the diazonium salt from which the azo dye is formed is a 4-aminobenzene diazonium salt, a 4-N-ethylaminobenzene diazonium salt, a 4-N,N-diethylamino benzene diazonium salt, a diphenylamine-4-diazonium salt, a 4-morpholino benzene diazonium salt, a 3-chloro-4-(N,N-diethylamino) benzene diazonium salt, or a 2,5-dimethoxy-4-(N,N-dimethylamino) benzene diazonium salt.
Claim 4
Dependent Claim
37 words
A composition as claimed in claim 1 wherein said compound from which the azo dye is formed is 3-hydroxy-2-naphthoic acid, methyl 3-hydroxy-2-naphthoate, 3-hydroxy-2-naphthamide, 3-hydroxy-2-naphthanilide, 3-hydroxy-2-naphth-o-toluidide, 3-hydroxy-7-methoxy-2-naphthanilide, 3-hydroxy-2-[N-(2-aminoethyl)]-naphthamide, 3-hydroxy-2-naphthoic acid piperidide, 3-hydroxy-2-naphth-p-anisidide, or 4-chloro-2,5-dimethoxy anilide of 3-hydroxy-2-naphthoic acid.
Claim 5
Dependent Claim
21 words
A composition as claimed in claim 1 wherein said o-quinone diazide or said diazonium compound produces said acidic light decomposition product.
Claim 6
Dependent Claim
32 words
A composition as claimed in claim 1 wherein said second component includes a substance other than said o-quinone diazide or said diazonium compound and said substance produces said acidic light decomposition product.
Claim 7
Dependent Claim
14 words
A composition as claimed in claim 5 wherein said substance is a halogenated hydrocarbon.
Claim 8
Dependent Claim
13 words
A composition as claimed in claim 6 wherein the halogenated hydrocarbon is iodoform.
Claim 9
Dependent Claim
14 words
A composition as claimed in claim 5 wherein said substance is a sulphonyl halide.
Claim 10
Dependent Claim
16 words
A light sensitive plate comprising a substrate coated with a composition as claimed in claim 1.
Claim 11
Dependent Claim
16 words
A composition as claimed in claim 1 wherein said non-light sensitive polymer is a novolak resin.
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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) | 1984-10-19 | 1985-04-20 | 1985-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-19 | 1989-04-20 | 1989-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-19 | 1993-04-20 | 1993-10-20 | $7700.00 | Window Closed / Lapsed |