Patent US3933499A successfully refreshed from Google Patents.
US3933499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printing plate comprising diazo-borofluoride and diazo resin layers
Assignee: Lith-Kem Corp
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Filing: 1974-07-24
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Granted: 1976-01-20
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Expires: 1994-07-24
Abstract
Abstract An aqueous developable subtractive printing plate is presented comprising a photosensitized hydrophilic surface having a photosensitive diazo-borofluoride salt thereon. A method for making a photosensitized printing plate is also presented wherein a photosensitive diazo-borofluoride salt is coated on the plate.
Inventors
- 👤 Richard T. Traskos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:02
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/016; G03F7/09; G03F7/095
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
117 words
A planographic printing plate having: a hydrophilic substrate; a first coating containing a water soluble light reactive diazo resin on said substrate; and a second coating containing a photosensitive solvent-soluble diazo-borofluoride salt and an organophilic hydrophobic water insoluble resin over and in intimate contact with said diazo resin, said organophilic hydrophobic water insoluble resin being less than 50% by weight of said second coating; said plate being developable by water or aqueous solution whereby areas of the diazo resin unexposed to light and areas of the diazo-borofluoride salt thereover are washed away to define hydrophilic oleophobic non-printing areas, and areas of the diazo resin exposed to light and the diazo-borofluoride salt thereover define hydrophobic oleophilic printing areas.
Claim 2
Dependent Claim
117 words
A planographic printing plate having: a hydrophilic substrate; a first coating containing a water soluble light reactive diazo resin on said substrate; and a second coating containing a photosensitive solvent-soluble diazo-borofluoride salt and an organophilic hydrophobic water insoluble resin over and in intimate contact with said diazo resin, said organophilic hydrophobic water insoluble resin being less than 50% by weight of said second coating; said plate being developable by water or aqueous solution whereby areas of the diazo resin unexposed to light and areas of the diazo-borofluoride salt thereover are washed away to define hydrophilic oleophobic non-printing areas, and areas of the diazo resin exposed to light and the diazo-borofluoride salt thereover define hydrophobic oleophilic printing areas.
Claim 3
Dependent Claim
25 words
The printing plate of claim 1 wherein: the amount of said water insoluble resin in said second coating is from 10% to 45% by weight.
Claim 4
Dependent Claim
27 words
The printing plate of claim 1 wherein: said water insoluble resin is selected from the group including polyvinylacetate, copolymers of polyvinylacetate and polyvinyl chloride, and styrene-butadiene copolymers.
Claim 5
Dependent Claim
25 words
The printing plate of claim 3 wherein: said diazo-borofluoride salt is present as the principal constituent in said layer coated over said diazo resin coating.
Claim 6
Dependent Claim
17 words
The printing plate of claim 1 wherein said diazo resin is stabilized to provide extended storage capability.
Claim 7
Dependent Claim
23 words
The printing plate of claim 5 wherein said diazo resin is stabilized with a complex of zinc chloride and a photosensitive diazo salt.
Claim 8
Dependent Claim
21 words
The printing plate of claim 1 wherein said diazo resin is the condensation product of a diazo salt and an aldehyde.
Claim 9
Dependent Claim
16 words
The printing plate of claim 1 wherein said diazo-borofluoride salt is a p-diazo-2,5-di(lowery alkoxy)-1-(p-tolylmercapto) benzene borofluoride.
Claim 10
Dependent Claim
14 words
The printing plate of claim 1 wherein said diazo-borofluoride salt is p-diazo-2,5-diethoxy-1-(p-tolylmercapto) benzene borofluoride.
Claim 11
Dependent Claim
25 words
The printing plate of claim 1 wherein said diazo-borofluoride salt is p-diazo-2,5-diethoxy-1-(p-tolylmercapto) benzene borofluoride; p-diazo-2,5-dimethoxy-1-(p-tolylmercapto) benzene borofluoride; 1-diazo-2,5-diethoxy-4-morpholino benzene borofluoride; 1-diazo-2-chloro-5-methoxy-4-methylaniline borofluoride; and 1-diazo-3-methyl-4-pyrrolidinobenzene borofluoride.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |