Patent US4458000A successfully refreshed from Google Patents.
US4458000A
Expired / Lapsed
US
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Light-sensitive mixture and light-sensitive copying material prepared therefrom wherein image produced therein is visible under yellow safety light
Assignee: Hoechst AG
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Filing: 1982-09-28
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Granted: 1984-07-03
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Expires: 2002-09-28
Abstract
Abstract Disclosed is a light-sensitive mixture comprising (a) a 1,2-quinonediazide or a mixture of (a 1 ) a compound forming an acid on exposure and (a 2 ) a compound having at least one C--O--C bond cleavable by acid; (b) a water-insoluble binder soluble in aqueous-alkaline solutions; (c) a photolytically cleavable organic halogen compound of one of the formulae ##STR1## in which R 1 denotes an aromatic radical bonded directly or via a conjugated chain, and X denotes a halogen atom; and (d) an azo dyestuff containing at least one nitro group in the molecule. Also disclosed are light-sensitive copying materials produced from these mixtures.
Inventors
- 👤 Paul Stahlhofen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:25
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/09; G03F7/105
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
131 words
A light-sensitive mixture, comprising: (a) a 1,2-quinonediazide or a mixture of (a 1 ) a compound forming an acid on exposure and (a 2 ) a compound having at least one C--O--C bond cleavable by acid; (b) a water-insoluble binder soluble in aqueous-alkaline solution; (c) a photolytically cleavable organic halogen compound of one of the formulae I and II ##STR4## in which R 1 denotes an aromatic radical bonded directly or via a conjugated chain, and X denotes a halogen atom; and (d) a dyestuff comprising an azo dyestuff containing at least one nitro group in the molecule, said ingredients a, b, c, and d being present in such amounts that said mixture produces after imagewise exposure thereof an image of an original which is clearly visible under yellow safety light.
Claim 2
Dependent Claim
131 words
A light-sensitive mixture, comprising: (a) a 1,2-quinonediazide or a mixture of (a 1 ) a compound forming an acid on exposure and (a 2 ) a compound having at least one C--O--C bond cleavable by acid; (b) a water-insoluble binder soluble in aqueous-alkaline solution; (c) a photolytically cleavable organic halogen compound of one of the formulae I and II ##STR4## in which R 1 denotes an aromatic radical bonded directly or via a conjugated chain, and X denotes a halogen atom; and (d) a dyestuff comprising an azo dyestuff containing at least one nitro group in the molecule, said ingredients a, b, c, and d being present in such amounts that said mixture produces after imagewise exposure thereof an image of an original which is clearly visible under yellow safety light.
Claim 3
Dependent Claim
15 words
A light-sensitive mixture as claimed in claim 1, wherein said dyestuff comprises a monoazo dyestuff.
Claim 4
Dependent Claim
35 words
A light-sensitive mixture as claimed in claim 1, wherein said azo dyestuff is present in an amount of from about 0.5 to 10% by weight relative to the content of nonvolatile constituents in said mixture.
Claim 5
Dependent Claim
16 words
A light-sensitive mixture as claimed in claim 1, wherein X is a chlorine or bromine atom.
Claim 6
Dependent Claim
23 words
A light-sensitive mixture as claimed in claim 1, wherein R 1 comprises an unsubstituted or a substituted naphthyl, acenaphthyl, diphenylyl or styryl group.
Claim 7
Dependent Claim
15 words
A light-sensitive material as claimed in claim 1, wherein said binder comprises a novolak resin.
Claim 8
Dependent Claim
16 words
A light-sensitive mixture as claimed in claim 1, wherein the 1,2-quinonediazide comprises a 1,2-naphthoquinone-2-diazidesulfonic acid ester.
Claim 9
Dependent Claim
37 words
A light-sensitive mixture as claimed in claim 1, wherein the compound having at least one C--O--C bond cleavable by acid comprises an orthocarboxylic acid derivative or a compound having at least one acetal group in the molecule.
Claim 10
Dependent Claim
32 words
A light-sensitive copying material, comprising a support and a light-sensitive layer which becomes soluble in a developer on light exposure and which layer comprising a light-sensitive mixture as defined by claim 1.
Claim 11
Dependent Claim
17 words
A light-sensitive mixture as claimed in claim 1, wherein said dyestuff comprises at least two nitro groups.
Claim 12
Dependent Claim
50 words
A light-sensitive mixture as claimed in claim 1, wherein said dyestuff is selected from (1) a blue azo dyestuff obtained by coupling the diazonium salt of 2,4-dinitro-6-chlorobenzene with (a) 2-methoxy-5-acetylamino-N,N-diethylaniline, (b) 2-methoxy-5-acetylamino-N-cyanoethyl-N-hydroxylethylaniline or (c) 2-ethoxy-5-acetylamino-N,N-bis(acetoxyethyl)-aniline, or (2) an azo dyestuff obtained by coupling the diazonium salt of 4-nitrobenzene with diphenylamine.
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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) | 1987-07-03 | 1988-01-02 | 1988-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-03 | 1992-01-02 | 1992-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-03 | 1996-01-02 | 1996-07-03 | $7700.00 | Window Closed / Lapsed |