US4262079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image transfer element
Assignee: 3M Co
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Filing: 1979-04-26
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Granted: 1981-04-14
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Expires: 1999-04-26
Abstract
Abstract A presensitized light sensitive sheet structure suitable for producing a dry transfer element, comprising a transparent substrate having a release coating thereon, and overlying the release coating a photo-sensitive layer comprising a conventional photopolymerizable compound, an initiator therefor, and a binder. After light exposure to an original through the transparent substrate and development to remove unexposed portions, the remaining image portions have a greater adhesion for a receptor surface when applied thereto under pressure than the adhesion of the indicia to the transparent substrate under like pressure.
Inventors
- 👤 Ronald S. Steelman
- 👤 Rodney J. Larkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:59
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/26; G03F7/34
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
145 words
A method for preparing a dry transfer element comprising: (a) imagewise exposing a presensitized sheet comprising a thin, flexible, transparent substrate having a release coating thereon, and overlying said release coating and releasably bonded thereby to said transparent substrate a photo-sensitive layer comprising an additional polymerizable, non-gaseous ethylenically-unsaturated compound containing at least one terminal ethylenic group, a free radical-liberating photoinitiator therefor, and a binder, to actinic radiation, whereby the exposed areas of the photosensitive layer are rendered insoluble to a solvent developing medium to thereby create a latent image; (b) developing said image with said solvent developing medium whereby unexposed portions of said photosensitive layer are removed, whereby said exposed areas of said photosensitive layer have greater adhesion at normal room temperature to a receptor surface when applied thereto under pressure than the adhesion of said photosensitive layer to said transparent substrate under like pressure.
Claim 2
Independent Claim
145 words
A method for preparing a dry transfer element comprising: (a) imagewise exposing a presensitized sheet comprising a thin, flexible, transparent substrate having a release coating thereon, and overlying said release coating and releasably bonded thereby to said transparent substrate a photo-sensitive layer comprising an additional polymerizable, non-gaseous ethylenically-unsaturated compound containing at least one terminal ethylenic group, a free radical-liberating photoinitiator therefor, and a binder, to actinic radiation, whereby the exposed areas of the photosensitive layer are rendered insoluble to a solvent developing medium to thereby create a latent image; (b) developing said image with said solvent developing medium whereby unexposed portions of said photosensitive layer are removed, whereby said exposed areas of said photosensitive layer have greater adhesion at normal room temperature to a receptor surface when applied thereto under pressure than the adhesion of said photosensitive layer to said transparent substrate under like pressure.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein said presensitized sheet further comprises a protective layer over said photosensitive layer.
Claim 4
Dependent Claim
12 words
The process of claim 2 wherein said protective layer comprises polyvinyl alcohol.
Claim 5
Dependent Claim
13 words
The process of claim 1 wherein said release coating comprises a silicone resin.
Claim 6
Dependent Claim
14 words
The process of claim 1 wherein said release coating comprises a telomer of tetrafluoroethylene.
Claim 7
Dependent Claim
15 words
The process of claim 1 wherein said binder comprises a pigmented carboxylated polyvinyl acetate copolymer.
Claim 8
Dependent Claim
12 words
The process of claim 1 wherein said transparent substrate is a polyester.
References Cited (Backward Citations)
US3380831A
Cited
US3607264A
Cited
US3639123A
Cited
US3754920A
Cited
US3794546A
Cited
US3775113A
Cited
US3782939A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-04-13 | 1984-10-13 | 1985-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-13 | 1988-10-13 | 1989-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-13 | 1992-10-13 | 1993-04-14 | $7700.00 | Window Closed / Lapsed |