US4019909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photohardenable vesicular image-forming elements
Assignee: EIDP Inc
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Filing: 1972-06-21
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Granted: 1977-04-26
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Expires: 1992-06-21
Abstract
Abstract A photohardenable thermoplastic stratum containing a thermally activated blowing agent may be used to record images by imagewise exposing the stratum to actinic radiation adapted to polymerize and harden the stratum image-wise, and heating the exposed stratum to soften the unhardened areas and decompose the blowing agent, whereby a positive image of microscopic bubbles is formed in said stratum.
Inventors
- 👤 Abraham Bernard Cohen
- 👤 Leo Roos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:09
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/60; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/106; Y10S430/113; Y10S430/114; Y10S430/118; Y10S430/119
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
100 words
An element comprising a support bearing at least one solid photohardenable layer that softens at 40° to 220° C. and is capable of forming a positive vesicular image, said layer comprising (a) about 60 to 99% by weight of at least one thermoplastic ethylenically unsaturated photohardenable material and (b) in admixture with said photohardenable material, about 1 to 40% by weight of a blowing agent which, when heated to at least 75° C., produces gas bubbles in areas of said layer which are not photohardened, said blowing agent being stable to actinic radiation by which said photohardenable material is photohardened.
Claim 2
Dependent Claim
100 words
An element comprising a support bearing at least one solid photohardenable layer that softens at 40° to 220° C. and is capable of forming a positive vesicular image, said layer comprising (a) about 60 to 99% by weight of at least one thermoplastic ethylenically unsaturated photohardenable material and (b) in admixture with said photohardenable material, about 1 to 40% by weight of a blowing agent which, when heated to at least 75° C., produces gas bubbles in areas of said layer which are not photohardened, said blowing agent being stable to actinic radiation by which said photohardenable material is photohardened.
Claim 3
Dependent Claim
78 words
An element according to claim 1 wherein said photohardenable material is comprised of 10 to 50% by weight of at least one non-gaseous, addition-polymerizable, ethylenically unsaturated compound having a boiling point about 100° C. at normal atmospheric pressure and being capable of forming a high polymer by photoinitiated addition polymerization and 30 to 80% by weight of at least one film-forming thermoplastic polymer binder, said blowing agent being stable to actinic light by which said layer is polymerizable.
Claim 4
Dependent Claim
12 words
An element according to claim 2, wherein said blowing agent is 4-ketobenzotriazine.
Claim 5
Dependent Claim
13 words
An element according to claim 2, wherein said blowing agent is sodium oxalate.
Claim 6
Dependent Claim
16 words
An element according to claim 2, wherein the ethylenically unsaturated compound is a polyethylene glycol diacrylate.
Claim 7
Dependent Claim
14 words
An element according to claim 2, wherein the ethylenically unsaturated compound is pentaerythritol triacrylate.
Claim 8
Dependent Claim
29 words
An element according to claim 2 containing an initiating amount of a free-radical generating addition polymerization initiator activatable by actinic light and thermally inactive at and below 185° C.
Claim 9
Dependent Claim
15 words
An element according to claim 2, wherein said polymer binder is a methyl methacrylate-containing polymer.
Claim 10
Dependent Claim
11 words
An element according to claim 1, wherein said support is colored.
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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) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |