Patent US4186017A successfully refreshed from Google Patents.
US4186017A
Expired / Lapsed
US
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Light-sensitive copying composition
Assignee: Hoechst AG
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Filing: 1977-09-06
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Granted: 1980-01-29
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Expires: 1997-09-06
Abstract
Abstract This invention relates to a light-sensitive copying composition comprising a diazonium salt condensation product, a stabilizer, and a polyurethane prepolymer with free terminal isocyanate groups.
Inventors
- 👤 Roland Palmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:01
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/016; G03F7/021; G03F7/0212; G03F7/0217
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
33 words
A negative-working light-sensitive copying composition comprising a light-sensitive diazonium salt condensation product, an acid stabilizer, and a polyurethane prepolymer having from about 1 to 30 percent by weight of free terminal isocyanate groups.
Claim 2
Dependent Claim
33 words
A negative-working light-sensitive copying composition comprising a light-sensitive diazonium salt condensation product, an acid stabilizer, and a polyurethane prepolymer having from about 1 to 30 percent by weight of free terminal isocyanate groups.
Claim 3
Dependent Claim
30 words
A copying composition according to claim 1 in which the acid is selected from the group consisting of phosphoric acid, sulfuric acid, perchloric acid, boric acid, and p-toluene sulfonic acid.
Claim 4
Dependent Claim
24 words
A copying composition according to claim 1 in which the diazonium salt condensation product is a reaction product of a diarylamine-4-diazonium salt and formaldehyde.
Claim 5
Dependent Claim
144 words
A copying composition according to claim 1 in which the diazonium salt condensation product is a mixed condensate which contains at least one unit each of the general types A(--D).sub.n and B which are linked by a bivalent intermediate member derived from a carbonyl compound capable of condensation, and wherein A is the radical of a compound containing at least two carbocyclic and/or heterocyclic aromatic rings and being capable of condensation in at least one position of its molecule with an active carbonyl compound in an acid medium, D is a diazonium salt group linked to an aromatic carbon atom of A, n is an integer from 1 to 10, and B is a radical of a compound free of diazonium groups and being capable of condensation in at least one position of its molecule with an active carbonyl compound in an acid medium.
Claim 6
Dependent Claim
31 words
A copying composition according to claim 4 in which the anion of the diazonium salt condensation product is the anion of an aliphatic monosulfonic acid with 1 to 6 carbon atoms.
Claim 7
Dependent Claim
14 words
A copying composition according to claim 1 which additionally contains a non-drying alkyd resin.
Claim 8
Dependent Claim
27 words
A copying composition according to claim 1 in which the polyurethane is present in the copying composition in a quantity between 30 and 80 percent by weight.
Claim 9
Dependent Claim
28 words
A copying composition according to claim 1 in which the diazo compound is present in the copying composition in a quantity between 20 and 70 percent by weight.
Claim 10
Dependent Claim
17 words
A copying composition according to claim 1 in the form of a light-sensitive layer on a support.
Claim 11
Dependent Claim
13 words
A copying composition according to claim 9 in which the support is aluminum.
References Cited (Backward Citations)
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-01-28 | 1983-07-30 | 1984-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-28 | 1987-07-30 | 1988-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-28 | 1991-07-30 | 1992-01-29 | $7700.00 | Window Closed / Lapsed |