Patent US2138813A successfully refreshed from Google Patents.
US3854950A
Expired / Lapsed
US
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Halation protection for multilayer imaging of photopolymers
Assignee: EIDP Inc
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Filing: 1972-06-09
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Granted: 1974-12-17
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Expires: 1992-06-09
Abstract
Abstract Clear and colorless photohardenable compositions and elements are described which are protected against halation effects by incorporating into the photohardenable composition substantial amounts of ultraviolet absorbing materials. The amount of ultraviolet absorber used reduces the normally transmitted actinic radiation of photohardenable layers by at least 50%. The ultraviolet absorbers many themselves be optical brighteners or may be used in combination with an optical brightener if necessary. Such photohardenable elements are useful in preparing sharp, bright, multicolor images with clean white backgrounds on toning with colorants.
Inventors
- 👤 R Held
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:55
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/027; G03C; G03C1/00; G03C1/76; G03C1/815; G03C1/8155; Y; Y10; Y10S; Y10S430/00; Y10S430/132
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
83 words
A SUBSTANTIALLY CLEAR AND COLORLESS PHOTOSENSITIVE COMPOSITION COMPRISING (A) A PHOTOHARDENABLE MATERIAL HAVING ETHYLENICALLY UNSATURATED OR BENZOPHENONE TYPE GROUPS, (B) A PHOTOINITIATOR ACTIVATABLE BY ACTINIC RADIATION IN THE REAR ULTRAVIOLET WAVELENGTH SPECTRAL REGION, AND (C) A SUFFICIENT AMOUNT OF AN ULTRAVIOLET RADIATION ABSORBING MATERIAL, WHICH ABSORBS THE RADIATION, TO REDUCE ULTRAVIOLET ACTINIC RADIATION TRANSMITTED BY A LAYER NO MORE THAN 0.001 INCH THICK OF THE PHOTOHARDENABLE COMPOSITION BY MORE THAN ABOUT 50 PERCENT, THE PHOTOHARDENABLE LAYER VISUALLY TRANSMITTING OR REFLECTING VIRTUALLY WHITE LIGHT.
Claim 2
Dependent Claim
83 words
A SUBSTANTIALLY CLEAR AND COLORLESS PHOTOSENSITIVE COMPOSITION COMPRISING (A) A PHOTOHARDENABLE MATERIAL HAVING ETHYLENICALLY UNSATURATED OR BENZOPHENONE TYPE GROUPS, (B) A PHOTOINITIATOR ACTIVATABLE BY ACTINIC RADIATION IN THE REAR ULTRAVIOLET WAVELENGTH SPECTRAL REGION, AND (C) A SUFFICIENT AMOUNT OF AN ULTRAVIOLET RADIATION ABSORBING MATERIAL, WHICH ABSORBS THE RADIATION, TO REDUCE ULTRAVIOLET ACTINIC RADIATION TRANSMITTED BY A LAYER NO MORE THAN 0.001 INCH THICK OF THE PHOTOHARDENABLE COMPOSITION BY MORE THAN ABOUT 50 PERCENT, THE PHOTOHARDENABLE LAYER VISUALLY TRANSMITTING OR REFLECTING VIRTUALLY WHITE LIGHT.
Claim 3
Dependent Claim
42 words
A photosensitive composition of claim 1 wherein said ultraviolet radiation absorbing material reduces ultraviolet actinic radiation transmitted by a layer of said composition by more than about 50 percent in the spectral region where said photoinitiator moderately or weakly absorbs ultraviolet radiation.
Claim 4
Dependent Claim
21 words
A photosensitive composition according to claim 1 wherein said ultraviolet radiation absorbing material is comprised of at least one optical brightener.
Claim 5
Dependent Claim
21 words
A photosensitive composition according to claim 2 wherein said ultraviolet radiation absorbing material is comprised of at least one optical brightener.
Claim 6
Dependent Claim
38 words
A photosensitive composition according to claim 4 wherein said optical brightener is present in an amount of at least 0.5 percent by weight of the composition and is selected from 2-(stilbyl-4'''')-(naphtho-1'',2'':4,5)-1,2,3-triazole-2''''-sulfonic acid phenyl ester, 7-(4''-chloro-6''-diethylamino-1'',3'',5''-triazine-4''-yl)amino-3-phenylcoumarin, and 3,7-di-(2,4-dimethoxybenzoylamino)-dibenzothiophenedioxide-2,8-disodium sulfonate.
Claim 7
Dependent Claim
29 words
A photosensitive composition according to claiM 1 wherein said ultraviolet radiation absorbing material is comprised of at least one ultraviolet radiation absorbing compound and at least one optical brightener.
Claim 8
Dependent Claim
29 words
A photosensitive composition according to claim 2 wherein said ultraviolet radiation absorbing material is comprised of at least one ultraviolet radiation absorbing compound and at least one optical brightener.
Claim 9
Dependent Claim
21 words
A photosensitive composition according to claim 6 wherein said ultraviolet radiation absorbing compound is 2,2''-dihydroxy-4-methoxybenzophenone and said optical brightener is 2-(stilbyl-4'''')-(naphtho-1'',2'':4,5)-1,2,3-triazole.
Claim 10
Dependent Claim
21 words
A photosensitive composition according to claim 7 wherein said ultraviolet radiation absorbing compound is 2,2''-dihydroxy-4-methoxybenzophenone and said optical brightener is 2-(stilbyl-4'''')-(naphtho-1'',2'':4,5)-1,2,3-triazole.
Claim 11
Dependent Claim
24 words
A photosensitive composition according to claim 1 wherein said ultraviolet radiation absorbing material is a compound selected from hydroxy- or alkoxybenzophenones and substituted benzotriazoles.
Claim 12
Dependent Claim
14 words
A photosensitive composition according to claim 1 wherein a polymeric binder is additionally present.
Claim 13
Dependent Claim
32 words
A photosensitive composition according to claim 1 wherein said photohardenable material is a free-radical initiated, chain propagating, addition polymerizable, ethylenically unsaturated compound and said photoinitiator is a free-radical generating addition polymerization initiator.
Claim 14
Dependent Claim
15 words
A photosensitive element comprising a support having a layer of the composition of claim 1.
Claim 15
Dependent Claim
15 words
A photosensitive element comprising a support having a layer of the composition of claim 2.
Claim 16
Dependent Claim
39 words
A photosensitive element comprising paper or polymeric film coated with a layer of the composition of claim 4, said layer having a thickness of less than 0.001 inch and being capable of being toned with finely divided powdered material.
Claim 17
Dependent Claim
65 words
A photosensitive element of claim 15 wherein said photohardenable material is a free-radical initiated, chain propagating, addition polymerizable, ethylenically unsaturated compound; said photoinitiator is a free-radical generating addition polymerization initiator and said optical brightener is present in an amount of at least 0.5 percent by weight of the composition and is selected from 2-(stilbyl-4'''')-(naphtho-1'',2'': 4,5)-1,2,3-triazole-2'''' -sulfonic acid phenyl ester, 7-(4''-chloro-6''-diethylamino-1'', 3'',5''-triazine-4''-yl)amino-3-phenylcoumarin, and 3,7-di-(2, 4-dimethoxybenzoylamino)-dibenzothiophenedioxide-2,8-disodium sulfonate.
Claim 18
Dependent Claim
32 words
A photosensitive element according to claim 14 wherein said support is transparent and said layer has a cover sheet which is less adherent to said layer at room temperature than said support.
Claim 19
Dependent Claim
25 words
A layer of imagewise exposed photohardenable material of claim 1 having tacky and non-tacky areas, said tacky areas having finely divided powdered material adhered thereto.
Claim 20
Dependent Claim
16 words
A multicolor imaged element comprising a plurality of laminated, imaged and toned layers of claim 18.
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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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |