Patent US4408532A successfully refreshed from Google Patents.
US4408532A
Expired / Lapsed
US
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Lithographic printing plate with oleophilic area of radiation exposed adduct of diazo resin and sulfonated polymer
Assignee: 3M Co
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Filing: 1982-02-03
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Granted: 1983-10-11
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Expires: 2002-02-03
Abstract
Abstract A light-sensitive adduct comprising the combination of a diazo resin having a plurality of pendant diazonium groups and a sulfonated polymer having a plurality of sulfonate groups and a presensitized light-sensitive article comprising a substrate having a light-sensitive coating which is comprised of the light-sensitive adduct on a surface thereof. After imagewise exposure, unexposed portions of the coating are removable by water or aqueous developers.
Inventors
- 👤 Joseph H. Incremona
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:05
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/0804; C08G18/0819; C08G18/0828; G; G03; G03F; G03F7/00; G03F7/004; G03F7/016; G03F7/021; G03F7/0212
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
64 words
A lithographic printing plate comprising a substrate having oleophilic image areas and hydrophilic background areas thereon, said oleophilic image areas comprising an actinic radiation-exposed adduct comprising the combination of a diazo resin having a plurality of pendant diazonium groups and a sulfonated polymer having a plurality of sulfonate groups, said sulfonated polymer being selected from the group consisting of sulfonated polyesters and sulfonated polyurethanes.
Claim 2
Dependent Claim
64 words
A lithographic printing plate comprising a substrate having oleophilic image areas and hydrophilic background areas thereon, said oleophilic image areas comprising an actinic radiation-exposed adduct comprising the combination of a diazo resin having a plurality of pendant diazonium groups and a sulfonated polymer having a plurality of sulfonate groups, said sulfonated polymer being selected from the group consisting of sulfonated polyesters and sulfonated polyurethanes.
Claim 3
Dependent Claim
27 words
The printing plate of claim 1 wherein said sulfonated polymer contains at least one sulfonate group per about 500 to about 8,000 molecular weight of said polymer.
Claim 4
Dependent Claim
27 words
The printing plate of claim 1 wherein said sulfonated polymer contains at least one sulfonate group per about 1,500 to about 3,000 molecular weight of said polymer.
Claim 5
Dependent Claim
22 words
The printing plate of claim 1 wherein the ratio of said diazo to sulfonate equivalents is less than about 1.5 to 1.
Claim 6
Dependent Claim
20 words
The printing plate of claim 4 wherein said ratio is from about 0.1 to 1 to about 0.6 to 1.
Claim 7
Dependent Claim
13 words
The printing plate of claim 20 wherein said ratio is 1.0 to 1.
Claim 8
Dependent Claim
19 words
The printing plate of claim 1 wherein said substrate comprises an aluminum sheet having a permanently hydrophilic surface thereon.
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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) | 1986-10-10 | 1987-04-11 | 1987-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-10 | 1991-04-11 | 1991-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-10 | 1995-04-11 | 1995-10-11 | $7700.00 | Window Closed / Lapsed |