Patent US4229518A successfully refreshed from Google Patents.
US4229518A
Expired / Lapsed
US
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Photohardenable elements with a non-tacky matte finish
Assignee: EIDP Inc
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Filing: 1976-07-08
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Granted: 1980-10-21
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Expires: 1996-07-08
Abstract
Abstract A photohardenable element useful, for example, in color proofing and the like, additionally containing a protective top-coat comprised of tacky material, e.g. a layer containing unexposed photohardenable monomer and plasticizer, said top-coat being dusted with a powdered material capable of rendering the layer non-tacky and suitable for further handling. The powdered material additionally gives the surface of the element a matte finish.
Inventors
- 👤 Russell H. Gray
- 👤 August D. Kuchta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:49
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/09; G03F7/092; G03F3/00; G03F3/10; G03F3/106; Y; Y10; Y10S; Y10S430/00; Y10S430/151
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
128 words
A photosensitive element comprising, in order, (1) a sheet support, (2) at least one toned, image-bearing photohardenable layer, and (3) a photohardenable protective layer having on its surface a non-tacky matte finish comprising a particulate oil-absorbing material selected from the group consisting of diatomaceous silicas and cellulose acetates having an average particle size of 1 to 25 microns, which absorbs at least 100% by weight of oil based on the weight of particulate material in the photohardenable protective layer as determined by the Gardner-Coleman Method, A.S.T.M. D-1483-60 and which does not absorb incident light to a degree that the color or appearance of the image-bearing layer contiguous thereto is changed from the normal, said photohardenable layers being comprised of a material selected from photopolymerizable, photocrosslinkable, and photodimerizable materials.
Claim 2
Dependent Claim
128 words
A photosensitive element comprising, in order, (1) a sheet support, (2) at least one toned, image-bearing photohardenable layer, and (3) a photohardenable protective layer having on its surface a non-tacky matte finish comprising a particulate oil-absorbing material selected from the group consisting of diatomaceous silicas and cellulose acetates having an average particle size of 1 to 25 microns, which absorbs at least 100% by weight of oil based on the weight of particulate material in the photohardenable protective layer as determined by the Gardner-Coleman Method, A.S.T.M. D-1483-60 and which does not absorb incident light to a degree that the color or appearance of the image-bearing layer contiguous thereto is changed from the normal, said photohardenable layers being comprised of a material selected from photopolymerizable, photocrosslinkable, and photodimerizable materials.
Claim 3
Dependent Claim
16 words
A photosensitive element of claim 1 wherein said photohardenable layer contains an addition-polymerizable, ethylenically unsaturated compound.
Claim 4
Dependent Claim
31 words
A photosensitive element of claim 1 wherein said photohardenable protective layer was exposed through a half-tone screen prior to application of particulate oil-absorbing material thereby reducing the degree of matte finish.
Claim 5
Dependent Claim
35 words
A photosensitive element of claim 1 wherein said element is comprised of a plurality of toned image-bearing photohardenable layers on a sheet support, the uppermost photohardenable layer having said particulate oil-absorbing material on its surface.
References Cited (Backward Citations)
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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) | 1983-10-21 | 1984-04-21 | 1984-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-21 | 1988-04-21 | 1988-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-21 | 1992-04-21 | 1992-10-21 | $7700.00 | Window Closed / Lapsed |