Patent US3620726A successfully refreshed from Google Patents.
US3620726A
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Process using colored particles to develop photohardenable imaging layers
Assignee: EIDP Inc
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Filing: 1968-01-29
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Granted: 1971-11-16
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Expires: 1988-01-29
Abstract
Abstract An improved image reproduction process in which an element having a support and a photohardenable layer, after imagewise exposure to actinic radiation to harden the layer in exposed areas without hardening in the underexposed areas, is colored only in the underexposed areas by dusting it or bringing it into contact with a surface bearing loosely bound colorant, the improvement being in the use of colorant having a particle size distribution within the range 0.2-30 microns with not more than 50 percent of particles being of less than 1 micron equivalent spherical diameter.
Inventors
- 👤 Victor Fu-Hua Chu
- 👤 Charles Walter Manger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:46
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/26; G03F7/28
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
32 words
A proCess according to claim 1 wherein the layer is photopolymerizable and contains a nongaseous ethylenically unsaturated monomer, a macromolecular organic polymer binder and an addition polymerization initiator activatable by actinic radiation.
Claim 2
Dependent Claim
100 words
exposed, complementary, adjoining, nontacky image areas solid at 50* C., not thermally transferable at said stick or transfer temperature at which the underexposed areas are thermally transferable, and comprising an addition polymer of an aforesaid ethylenically unsaturated compound and said thermoplastic compound; said process comprising A. applying finely divided discrete solid particles of colorant to the stratum, said particles having a size distribution within the range 0.2 to 30 microns and not more than 50 percent of the particles being less than 1 micron equivalent spherical diameter; and B. physically removing particles from the exposed image areas of the stratum.
Claim 3
Dependent Claim
20 words
A process according to claim 1 wherein more than 50 percent of the particles have a size of 5-10 microns.
Claim 4
Dependent Claim
16 words
A process for forming images from a stratum which is solid below 40* C. and contains
Claim 5
Dependent Claim
22 words
A process according to claim 4 wherein said thermoplastic compound is a methyl methacrylate polymer and said unsaturated compound is trimethylolpropane trimethacrylate.
Claim 6
Dependent Claim
19 words
A process according to claim 1 wherein the discrete solid particles are polymeric matrices containing evenly dispersed pigment crystallites.
Claim 7
Dependent Claim
41 words
A process according to claim 6, wherein the polymeric matrix is a member selected from the group consisting of polyvinyl chloride, cellulose acetate, cellulose acetate butyrate, polystyrene, polymethyl methacrylate, polyvinyl alcohol, methyl cellulose, carboxymethyl cellulose, vinyl chloride/vinyl acetate copolymer, and gelatin.
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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |