US3793033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Development-free printing plate
Assignee: 3M Co
•
Filing: 1972-09-05
•
Granted: 1974-02-19
•
Expires: 1992-09-05
Abstract
Abstract A presensitized, light-sensitive article capable of providing a lithographic printing plate requiring only image-wise exposure to actinic light and no subsequent image development is provided. The article is comprised of a support coated with a hydrophilic composition comprised of: 1) an organic solvent-soluble phenolic resin, and 2) a hydroxyethylcellulose ether, and in reactive association therewith a photoinitiator capable of generating free radicals on exposure to actinic light. Upon imagewise exposure the coated composition becomes more oleophilic in exposed image areas, while remaining hydrophilic and water-receptive in unexposed background areas.
Inventors
- 👤 J Mukherjee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:59
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/04; G03F7/016; G03F7/021; G03F7/0212; G03F7/0215; G03F7/038
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
21 words
The article of claim 1 wherein said photoinitiator is situated in a separate adjacent layer from said layer of hydrophilic composition.
Claim 2
Dependent Claim
72 words
overlying said support a layer of hydrophilic composition capable of being rendered more oleophilic in areas exposed to actinic radiation comprising: a. from about 0.5 to about 3.0 parts by weight of an organic solvent-soluble phenolic resin containing at least 3 hydroxy-substituted benzene rings per 1,000 molecular weight of said resin, per part of b. a hydroxyethylcellulose ether having about 1 to about 5 oxyethyl groups per anhydroglucose unit of cellulose, and
Claim 3
Dependent Claim
19 words
a photoinitiator reactively associated with said hydrophilic composition and capable of generating free radicals upon exposure to actinic radiation.
Claim 4
Dependent Claim
17 words
The article of claim 1 wherein said hydrophilic composition contains a curing agent for said phenolic resin.
Claim 5
Dependent Claim
11 words
The article of claim 3 wherein said phenolic resin is cured.
Claim 6
Dependent Claim
17 words
The article of claim 1 wherein said hydrophilic composition contains a curing agent for said hydroxyethylcellulose ether.
Claim 7
Dependent Claim
11 words
The article of claim 5 wherein said hydroxyethylcellulose ether is cured.
Claim 8
Dependent Claim
17 words
The article of claim 1 wherein said photoinitiator is incorporated into said layer of said hydrophilic composition.
Claim 9
Dependent Claim
14 words
The article of claim 1 wherein said phenolic resin is a novolak phenolic resin.
Claim 10
Dependent Claim
14 words
The article of claim 1 wherein said phenolic resin is a resole phenolic resin.
Claim 11
Dependent Claim
16 words
The article of claim 1 wherein said phenolic resin is a hydroxybenzaldehyde derivative of polyvinyl alcohol.
Claim 12
Dependent Claim
18 words
The article of claim 1 wherein said hydroxyethylcellulose ether has a molecular weight between about 250,000 and 500,000.
References Cited (Backward Citations)
US3287128A
Cited
US3285745A
Cited
US3231378A
Cited
US3615532A
Cited
US3388995A
Cited
US3651170A
Cited
US3409487A
Cited
US3459128A
Cited
US3549373A
Cited
US3615452A
Cited
US3715210A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |