US4511640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aqueous developable diazo lithographic printing plates with admixture of polyvinyl acetate and styrene maleic acid ester copolymer
Assignee: CNA Holdings LLC
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Filing: 1983-08-25
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Granted: 1985-04-16
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Expires: 2003-08-25
Abstract
Abstract An improved negative working photographic element is prepared by coating a suitable substrate with a photosensitive composition comprising a light sensitive diazonium salt and a binder composition comprising a polyvinyl acetate resin and a styrene/maleic acid half ester copolymer. Upon imagewise exposure of the element to actinic radiation through a suitable mask, the unexposed portions are removable with an aqueous developer.
Inventors
- 👤 Shuchen Liu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:47
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/016; G03F7/021; G03F7/0212; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/106; Y10S430/11; Y10S430/111
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
108 words
An aqueous developable photosensitive lithographic printing plate composition which comprises, in admixture, about 20% to about 50% by weight of a light sensitive, negative working diazonium salt; about 8% to about 33% by weight of a polyvinyl acetate resin having an average molecular weight in the range of from about 100,000 to less than about 800,000; and about 25% to about 55% by weight of a styrene end-capped, styrene/maleic acid half ester co-polymer of the formula ##STR2## wherein R is a lower aliphatic alcohol residue having from 1 to about 5 carbon atoms and wherein said polymer has an average molecular weight of not more than about 50,000.
Claim 2
Dependent Claim
108 words
An aqueous developable photosensitive lithographic printing plate composition which comprises, in admixture, about 20% to about 50% by weight of a light sensitive, negative working diazonium salt; about 8% to about 33% by weight of a polyvinyl acetate resin having an average molecular weight in the range of from about 100,000 to less than about 800,000; and about 25% to about 55% by weight of a styrene end-capped, styrene/maleic acid half ester co-polymer of the formula ##STR2## wherein R is a lower aliphatic alcohol residue having from 1 to about 5 carbon atoms and wherein said polymer has an average molecular weight of not more than about 50,000.
Claim 3
Dependent Claim
26 words
The composition of claim 1 wherein the diazonium salt is present in an amount of from about 30% to about 40% by weight of the composition.
Claim 4
Dependent Claim
27 words
The composition of claim 1 wherein the polyvinyl acetate resin is present in an amount of from about 18% to about 23% by weight of the composition.
Claim 5
Dependent Claim
29 words
The composition of claim 1 wherein the styrene/maleic acid half ester copolymer is present in an amount of from about 37% to about 43% by weight of said composition.
Claim 6
Dependent Claim
64 words
The composition of claim 1 wherein the diazonium salt is present in an amount of from about 30% to about 40%, and wherein the polyvinyl acetate resin is present in an amount of from about 18% to about 23%, and wherein the styrene/maleic acid half ester copolymer is present in an amount of from about 37% to about 43% by weight of said composition.
Claim 7
Dependent Claim
22 words
The composition of claim 1 wherein the said co-polymer has an average molecular weight in the range of about 10,000 to 50,000.
Claim 8
Dependent Claim
17 words
The composition of claim 1 wherein the said copolymer has an average molecular weight of about 20,000.
Claim 9
Dependent Claim
24 words
The composition of claim 1 wherein the said resin has an average molecular weight in the range of from about 100,000 to about 700,000.
Claim 10
Dependent Claim
24 words
The composition of claim 1 wherein the said resin has an average molecular weight in the range of from about 100,000 to about 380,000.
Claim 11
Dependent Claim
25 words
The composition of claim 1 wherein the diazonium salt is the polycondensation product of 3-methoxy-4-diazo-diphenyl amine sulfate and 4,4'-bis-methoxy methyl-diphenyl ether, precipitated as mesitylene sulfonate.
Claim 12
Dependent Claim
63 words
The composition of claim 1 wherein the said resin has an average molecular weight in the range of from about 100,000 to about 380,000; and said polymer has an average molecular weight in the range of from about 10,000 to about 50,000; and wherein said diazonium salt is the polycondensation product of 3-methoxy-4-diazo-diphenyl amine sulfate and 4,4'-bis-methoxy methyl-diphenyl ether, precipitated a mesitylene sulfonate.
Claim 13
Dependent Claim
23 words
The composition of claim 1 further comprising one or more ingredients selected from the group consisting of exposure indicators, acid stabilizers and colorants.
Claim 14
Dependent Claim
18 words
A lithographic printing plate which comprises a substrate and the composition of claim 1 coated on said substrate.
Claim 15
Dependent Claim
20 words
A lithographic printing plate which comprises an aluminum containing substrate and the composition of claim 1 coated on said substrate.
Claim 16
Dependent Claim
20 words
A lithographic printing plate which comprises an aluminum containing substrate and the composition of claim 11 coated on said substrate.
Claim 17
Dependent Claim
33 words
A lithographic printing plate which comprises an aluminum containing substrate, at least one surface of which has been grained, anodized and hydrophilized; and the composition of claim 1 coated onto said treated surface.
Claim 18
Dependent Claim
41 words
A lithographic printing plate which comprises an aluminum containing substrate, at least one surface of which has been grained, anodized and treated with a polyvinyl phosphoric acid containing hydrophilizing composition; and the composition of claim 11 coated onto said treated surface.
Claim 19
Dependent Claim
32 words
A lithographic printing plate which comprises an aluminum containing substrate, at least one surface of which has been grained and hydrophilized; and the composition of claim 1 coated onto said treated surface.
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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) | 1988-04-15 | 1988-10-15 | 1989-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-15 | 1992-10-15 | 1993-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-15 | 1996-10-15 | 1997-04-16 | $7700.00 | Window Closed / Lapsed |