Patent US4479676A successfully refreshed from Google Patents.
US4431723A
Expired / Lapsed
US
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Aqueous processible, alcohol resistant flexographic printing plates
Assignee: EIDP Inc
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Filing: 1981-09-21
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Granted: 1984-02-14
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Expires: 2001-09-21
Abstract
Abstract Photosensitive elastomeric compositions comprising about 40 to 90 weight percent of a heat workable, carboxyl- and sulfur-containing polymer of a diene; about 2 to 50 weight percent of a nongaseous, ethylenically unsaturated compound; and about 0.001 to 10 weight percent of a radical generating system; the compositions being useful for making flexographic printing plates.
Inventors
- 👤 Stephen Proskow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:07
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/027; G03F7/032; G03F7/033; C; C08; C08C; C08C19/00; C08C19/20; C08F; C08F279/00; C08F279/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
137 words
A photosensitive, elastomeric composition developable in aqueous base/organic solvent mixtures comprising, by total weight of the composition, (i) about 40 to 90 percent of a heat workable mercaptocarboxylic acid-modified polymer selected from at least one member of the group butadiene and isoprene, said polymer characterized by having (a) a number average molecular weight of about 15,000 to 1,000,000, (b) a carboxyl content of about 1 to 15 percent by weight of polymer (i), (c) at least about 0.7 percent of sulfur, by weight of polymer (i), (ii) about 2 to 50 percent of a nongaseous, ethylenically unsaturated compound containing at least one terminal ethylenic group, said compound being compatible with polymer (i) and polymerizable by the radical generating system of (iii), and (iii) about 0.001 to 10 percent of a radical generating system activatable by actinic radiation.
Claim 2
Dependent Claim
137 words
A photosensitive, elastomeric composition developable in aqueous base/organic solvent mixtures comprising, by total weight of the composition, (i) about 40 to 90 percent of a heat workable mercaptocarboxylic acid-modified polymer selected from at least one member of the group butadiene and isoprene, said polymer characterized by having (a) a number average molecular weight of about 15,000 to 1,000,000, (b) a carboxyl content of about 1 to 15 percent by weight of polymer (i), (c) at least about 0.7 percent of sulfur, by weight of polymer (i), (ii) about 2 to 50 percent of a nongaseous, ethylenically unsaturated compound containing at least one terminal ethylenic group, said compound being compatible with polymer (i) and polymerizable by the radical generating system of (iii), and (iii) about 0.001 to 10 percent of a radical generating system activatable by actinic radiation.
Claim 3
Dependent Claim
27 words
A composition according to claim 1 wherein the polymer has a molecular weight of about 25,000 to 250,000 and a carboxyl content of 1 to 8 percent.
Claim 4
Dependent Claim
25 words
A composition according to claim 1 comprising, additionally, up to about 40 percent by weight of the total composition of low molecular weight butadiene polymer.
Claim 5
Dependent Claim
15 words
A composition according to claim 1 wherein the polymer is a block copolymer of butadiene/styrene.
Claim 6
Dependent Claim
15 words
A composition according to claim 1 wherein the polymer is a block copolymer of styrene/isoprene.
Claim 7
Dependent Claim
47 words
A composition according to any one of claims 1 or 2 wherein the polymer is present at about 60 to 90 percent, the ethylenically unsaturated compound is present at about 5 to 35 percent, and the radical generating system is present at about 0.1 to 5 percent.
Claim 8
Dependent Claim
28 words
A composition according to any one of claims 1 or 2 wherein the ethylenically unsaturated compound is 1,6-hexanediol diacrylate and the radical generating system is benzil dimethyl ketal.
Claim 9
Dependent Claim
38 words
A composition according to any one of claims 1 or 2 wherein the polymer is a block copolymer of butadiene/styrene or styrene/isoprene, the ethylenically unsaturated compound is 1,6-hexanediol diacrylate and the radical generating system is benzil dimethyl ketal.
Claim 10
Dependent Claim
17 words
A photosensitive element comprising a substrate coated with a layer of the composition according to claim 1.
References Cited (Backward Citations)
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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) | 1987-02-13 | 1987-08-15 | 1988-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-13 | 1991-08-15 | 1992-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-13 | 1995-08-15 | 1996-02-14 | $7700.00 | Window Closed / Lapsed |