US4775607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-sensitive mixed diazonium condensate printing plate for waterless offset printing
Assignee: Hoechst AG
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Filing: 1986-12-17
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Granted: 1988-10-04
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Expires: 2006-12-17
Abstract
Abstract A light-sensitive printing plate for waterless offset printing is comprised of a layer carrier, a light-sensitive layer containing a diazonium salt polycondensation product, and of an ink-repellent crosslinked silicone elastomer layer superimposed on the light-sensitive layer, wherein the diazonium salt polycondensation product comprises recurrent A-N 2 X and B units which are mutually linked by bridge members, preferably methylene groups, derived from carbonyl compounds capable of condensation, A being the radical of an aromatic diazonium compound capable of condensation with formaldehyde and B being the radical of a compound, in particular an aromatic amine, a phenol, a phenol ether, an aromatic thioether, an aromatic hydrocarbon, an aromatic heterocyclic compound or an organic acid amide, that is free of diazonium groups and that is capable of condensation with formaldehyde. The printing plate can be readily developed with developers which contain organic solvents, to give printing forms with good resolution, good ink repellency in the background areas, and long print runs.
Inventors
- 👤 Hans-Joachim Schlosser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:50
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/016; G03F7/021; G03F7/075; G03F7/0752
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
107 words
A light-sensitive printing plate for waterless offset printing, comprised of (a) a layer carrier; (b) a light-sensitive layer provided on said layer carrier that contains a diazonium salt polycondensation product; and (c) an ink-repellent crosslinked silicone elastomer layer provided on said light-sensitive layer, wherein said diazonium salt polycondensation product comprises recurrent A-N 2 X and B units which are mutually linked by bridge members derived from carbonyl compounds capable of condensation, A being the radical of an aromatic diazonium compound capable of condensation with formaldehyde, and B being the radical of a compound that is free of diazonium groups and that is capable of condensation with formaldehyde.
Claim 2
Dependent Claim
107 words
A light-sensitive printing plate for waterless offset printing, comprised of (a) a layer carrier; (b) a light-sensitive layer provided on said layer carrier that contains a diazonium salt polycondensation product; and (c) an ink-repellent crosslinked silicone elastomer layer provided on said light-sensitive layer, wherein said diazonium salt polycondensation product comprises recurrent A-N 2 X and B units which are mutually linked by bridge members derived from carbonyl compounds capable of condensation, A being the radical of an aromatic diazonium compound capable of condensation with formaldehyde, and B being the radical of a compound that is free of diazonium groups and that is capable of condensation with formaldehyde.
Claim 3
Dependent Claim
16 words
A light-sensitive printing plate as claimed in claim 1, wherein said bridge members are methylene groups.
Claim 4
Dependent Claim
45 words
A light-sensitive printing plate as claimed in claim 1, wherein said compound for radical B is selected from the group consisting of an aromatic amine, a phenol, a phenol ether, an aromatic thioether, an aromatic hydrocarbon, an aromatic heterocyclic compound and an organic acid amide.
Claim 5
Dependent Claim
180 words
A light-sensitive printing plate as claimed in claim 1, wherein said A-N 2 X units are derived from compounds represented by the formula (R.sup.1 --R.sup.3 --).sub.p R.sup.2 --N.sub.2 X where X is the anion of the diazonium compound, p is an integer from 1 to 3, R 1 is an aromatic radical with at least one position capable of condensation with an active carbonyl compound, R 2 is a phenylene group, R 3 is a single bond or one of the groups: --(CH 2 ) q --NR 4 --, --O--(CH 2 ) r --NR 4 --, --S--(CH 2 ) r --NR 4 --, --S--CH 2 CO--NR 4 --, --O--R 5 --O--, --O-- --S-- or --CO--NR 4 -- in which q is a number from 0 to 5, r is a number from 2 to 5, R 4 is hydrogen, an alkyl group having 1 to 5 carbon atoms, an aralkyl group having 7 to 12 carbon atoms or an aryl group having 6 to 12 carbon atoms and R 5 is an arylene group having 6 to 12 carbon atoms.
Claim 6
Dependent Claim
18 words
A light-sensitive printing plate as claimed in claim 1, wherein said light-sensitive layer further contains a polymeric binder.
Claim 7
Dependent Claim
16 words
A light-sensitive printing plate as claimed in claim 5, wherein said binder contains vinyl acetal units.
Claim 8
Dependent Claim
46 words
A light-sensitive printing plate as claimed in claim 5, wherein said binder is a reaction product of (i) an intramolecular anhydride of an organic polycarboxylic acid with (ii) a synthetic polymer which contains hydroxyl groups but no other functional groups capable of reacting with acid anhydrides.
Claim 9
Dependent Claim
20 words
A light-sensitive printing plate as claimed in claim 7, wherein said organic polycarboxylic acid is a dicarboxylic or tricarboxylic acid.
Claim 10
Dependent Claim
32 words
A light-sensitive printing plate as claimed in claim 5, wherein said light-sensitive layer contains 5 to 90% by weight of diazonium salt polycondensation product and 10 to 95% by weight of binder.
Claim 11
Dependent Claim
25 words
A light-sensitive printing plate as claimed in claim 1, wherein said silicone elastomer is a multicomponent elastomer of the addition type or the condensation type.
Claim 12
Dependent Claim
38 words
A light-sensitive printing plate as claimed in claim 1, wherein said light-sensitive layer has a thickness ranging from about 0.2 to 3 μm, and said silicone elastomer layer has a thickness ranging from about 1 to 20 μm.
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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) | 1991-10-04 | 1992-04-04 | 1992-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-04 | 1996-04-04 | 1996-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-04 | 2000-04-04 | 2000-10-04 | $7700.00 | Window Closed / Lapsed |