US4404272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-sensitive mixture and copying material prepared therefrom with novolak having brominated phenol units
Assignee: Hoechst AG
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Filing: 1982-02-23
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Granted: 1983-09-13
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Expires: 2002-02-23
Abstract
Abstract A light-sensitive mixture, which is composed of a light-sensitive compound, for example, an o-quinone-diazide or a diazonium salt polycondensate, or a light-sensitive combination of compounds, for example, a photolytic acid donor and an acetal compound or orthocarboxylic acid compound which can be cleaved by acid, and of a novolak having halogenated phenol units is described. The mixture is preferably used for the preparation of printing plates, in particular planographic printing plates, which have an improved resistance to aqueous-alkaline developer solutions, gasoline hydrocarbons and fountain solutions containing alcohol.
Inventors
- 👤 Paul Stahlhofen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:26
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/016; G03F7/021; G03F7/0045; G03F7/022; G03F7/023; G03F7/0233; G03F7/0236; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/106; Y10S430/108
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
80 words
A light-sensitive mixture comprising, as the light-sensitive compound, an o-quinone-diazide or, as a light-sensitive combination of compounds, a mixture of (a) a compound which releases an acid on exposure, and (b) a compound containing at least one C--O--C group which can be cleaved by an acid, the solubility of which mixture in an aqueous-alkaline solution is increased upon exposure, and a novolak containing brominated phenol units wherein the brominated novolak contains about 15 to 50 percent by weight of bromine.
Claim 2
Dependent Claim
80 words
A light-sensitive mixture comprising, as the light-sensitive compound, an o-quinone-diazide or, as a light-sensitive combination of compounds, a mixture of (a) a compound which releases an acid on exposure, and (b) a compound containing at least one C--O--C group which can be cleaved by an acid, the solubility of which mixture in an aqueous-alkaline solution is increased upon exposure, and a novolak containing brominated phenol units wherein the brominated novolak contains about 15 to 50 percent by weight of bromine.
Claim 3
Dependent Claim
90 words
A light-sensitive copying material comprising a support and a light-sensitive layer thereon which contains, as the light-sensitive compound, an o-quinone-diazide or, as a light-sensitive combination of compounds, a mixture of (a) a compound which releases an acid on exposure, and (b) a compound containing at least one C--O--C group which can be cleaved by an acid, the solubility of which mixture in an aqueous-alkaline solution is increased upon exposure, and a novolak containing brominated phenol units wherein the brominated novolak contains about 15 to 50 percent by weight of bromine.
Claim 4
Dependent Claim
90 words
A light-sensitive copying material comprising a support and a light-sensitive layer thereon which contains, as the light-sensitive compound, an o-quinone-diazide or, as a light-sensitive combination of compounds, a mixture of (a) a compound which releases an acid on exposure, and (b) a compound containing at least one C--O--C group which can be cleaved by an acid, the solubility of which mixture in an aqueous-alkaline solution is increased upon exposure, and a novolak containing brominated phenol units wherein the brominated novolak contains about 15 to 50 percent by weight of bromine.
Claim 5
Dependent Claim
30 words
A light-sensitive mixture as claimed in claim 1 which additionally contains a resin which is insoluble in water and soluble in aqueous-alkaline solutions and which is not a brominated novolak.
Claim 6
Dependent Claim
15 words
A light-sensitive mixture as claimed in claim 1 which additionally contains a thermosetting hydroxymethylphenol derivative.
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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) | 1986-09-12 | 1987-03-14 | 1987-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-12 | 1991-03-14 | 1991-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-12 | 1995-03-14 | 1995-09-13 | $7700.00 | Window Closed / Lapsed |