US3661575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gravure printing plate of photocurable material
Assignee: WR Grace and Co
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Filing: 1970-01-05
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Granted: 1972-05-09
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Expires: 1990-01-05
Abstract
Abstract This invention relates to a gravure printing plate and methods of making same, said plate comprising a photocurable composition, i.e., a polyene, polythiol and photosensitizer, optionally having a screen or grid embedded in the photocurable composition.
Inventors
- 👤 Arthur D Ketley
- 👤 Joseph A Cogliano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:23
CPC Classifications
G; G03; G03F; G03F5/00; G03F5/20; G03F7/00; G03F7/004; G03F7/027; G03F7/0275
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
195 words
THe process of forming a gravure printing plate which comprises filling the cells of a grid-etched metal cylinder with a composition consisting essentially of (1) 98 to 2 percent by weight of said composition of a polyene containing at least 2 reactive unsaturated carbon to carbon bonds per molecule, (2) 2 to 98 percent by weight of said composition of a polythiol containing at least 2 thiol groups per molecule, the total combined functionality of (a) the reactive unsaturated carbon to carbon bonds per molecule in the polyene and (b) the thiol groups per molecule in the polythiol being greater than 4, and (3) 0.0005 to 50 percent by weight of said composition of a photosensitizer, covering the thus filled cells with a film transparent to actinic radiation exposing said composition to actinic radiation through an image-bearing continuous tone negative transparency thereby causing portions of the composition exposed to actinic radiation to adhere to the film, and form a solidified cured reverse image relative to said transparency, stripping the film and the adhering cured composition from the cylinder and exposing the residual portion of the composition in the cells of the cylinder to actinic radiation.
Claim 2
Dependent Claim
183 words
A process for forming a gravure printing plate which comprises filling the cells of a metal cylinder shell which has been grid-etched through its thickness with a composition consisting essentially of (1) 98 to 2 percent by weight of said composition of a polyene containing at least 2 reactive unsaturated carbon to carbon bonds per molecule, (2) 2 to 98 percent by weight of said composition of a polythiol containing at least 2 thiol groups per molecule, the total combined functionality of (a) the reactive uncured carbon to carbon bonds per molecule in the polyene and (b) the thiol groups per molecule in the polythiol being greater than 4, and (3) 0.0005 to 50 percent by weight of said composition of a photosensitizer, exposing said composition on the inside of the shell to actinic radiation through an image-bearing, continuous tone, positive transparency thereby causing portions of the composition exposed to actinic radiation to form a solidified cured reverse image relative to said transparency and thereafter removing uncured portions of the composition on the outside of the shell to form a gravure printing plate.
References Cited (Backward Citations)
US3055758A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |