US4536464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photosensitive composition with o-quinonediazide compound and condensate of dihydric phenol and aldehyde or ketone
Assignee: Fujifilm Holdings Corp
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Filing: 1983-11-10
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Granted: 1985-08-20
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Expires: 2003-11-10
Abstract
Abstract The photosensitive composition suitable as a posi-posi photosensitive composition for photosensitive lithographic printing plates is composed of a high molecular compound shown by following general formula I or II and an o-naphthoquinonediazide compound; <IMAGE> I <IMAGE> II wherein R1 is a hydrogen atom, an alkyl group having 1 to 8 carbon atoms and R2 and R3 each is a hydrogen atom or an alkyl group having 1 to 4 carbon atoms. When the photosensitive composition is used as a photosensitive layer of a photosensitive lithographic printing plate and the plate is developed by rubbing with a sponge containing a developer, the photosensitive composition at the exposed areas is completely removed leaving no patches of the composition.
Inventors
- 👤 Akira Nagashima
- 👤 Akira Hasegawa
- 👤 Toshiaki Aoai
- 👤 Teruo Nagano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:46
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/022; G03F7/023; G03F7/0233; G03F7/0236; C; C08; C08G; C08G8/00; C08G8/04; C08G8/08; C08G8/20; C08K; C08K5/00; C08K5/16; C08K5/22; C08K5/27; C08K5/28; G03C; G03C1/00; G03C1/72
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
110 words
A photosensitive composition comprising in admixture, a high molecular compound having the structure shown by following general Formula I or II and an o-naphthoquinonediazide as a photosensitive compound; ##STR3## wherein R 1 represents an ethyl group, a n-propyl group, a n-butyl group, a t-butyl group or a n-pentyl group and R 2 and R 3 each represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, wherein the proportion of the high molecular compound in the photosensitive composition is 2 to 90% by weight and wherein the o-naphthoquinonediazide compound is present in the composition in an amount in the range of 10% to 50% by weight.
Claim 2
Dependent Claim
110 words
A photosensitive composition comprising in admixture, a high molecular compound having the structure shown by following general Formula I or II and an o-naphthoquinonediazide as a photosensitive compound; ##STR3## wherein R 1 represents an ethyl group, a n-propyl group, a n-butyl group, a t-butyl group or a n-pentyl group and R 2 and R 3 each represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, wherein the proportion of the high molecular compound in the photosensitive composition is 2 to 90% by weight and wherein the o-naphthoquinonediazide compound is present in the composition in an amount in the range of 10% to 50% by weight.
Claim 3
Dependent Claim
51 words
The photosensitive composition as claimed in claim 1 wherein the general formulae I and II, R 1 is an ethyl group, a n-propyl group, a n-butyl group, a t-butyl group, or a n-pentyl group; R 2 is a hydrogen atom; and R 3 is a methyl group or an ethyl group.
Claim 4
Dependent Claim
29 words
The photosensitive composition as claimed in claim 1 wherein the high molecular compound shown by general formula I or II has a molecular weight of about 500 to 10,000.
Claim 5
Dependent Claim
25 words
A photosensitive composition as claimed in claim 3, wherein the high molecular compound has a molecuar weight in the range of about 800 to 4,000.
Claim 6
Dependent Claim
30 words
A photosensitive composition as claimed in claim 1, wherein the high molecular compound is present in the composition in an amount in the range of 20% to 70% by weight.
Claim 7
Dependent Claim
28 words
A photosensitive composition as claimed in claim 1, wherein the o-naphthoquinonediazide is present in the composition in an amount in the range of 20% to 40% by weight.
Claim 8
Dependent Claim
42 words
A photosensitive composition as claimed in claim 1, further comprising a binder comprised of conventional alkali-soluble high molecular compounds present in the composition in an amount of 0 to 80% by weight of the total amount of the alkali-soluble high molecular compound.
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) | 1988-08-19 | 1989-02-18 | 1989-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-19 | 1993-02-18 | 1993-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-19 | 1997-02-18 | 1997-08-20 | $7700.00 | Window Closed / Lapsed |