US4177074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Butadiene/acrylonitrile photosensitive, elastomeric polymer compositions for flexographic printing plates
Assignee: EIDP Inc
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Filing: 1978-01-25
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Granted: 1979-12-04
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Expires: 1998-01-25
Abstract
Abstract Photosensitive, elastomeric compositions containing (1) a high molecular weight butadiene/acrylonitrile copolymer, (2) a low molecular weight butadiene polymer, (3) an ethylenically unsaturated monomer, and (4) a free-radical generating system have outstanding properties as photosensitive coatings for flexographic printing plates. When the combination of high and low molecular weight polymers contains at least about 2% by weight of carboxyl groups, the compositions are processable in aqueous or semiaqueous basic solutions.
Inventors
- 👤 Stephen Proskow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:22
CPC Classifications
C; C08; C08F; C08F279/00; C08F279/02; C08L; C08L13/00; C08L9/00; C08L9/02; G; G03; G03F; G03F7/00; G03F7/004; G03F7/027; G03F7/032; G03F7/033; C08L2205/00; C08L2205/02; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/106; Y10S430/114; Y10S430/117; Y10S430/137
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
191 words
A photosensitive, elastomeric composition which comprises, based on the total composition, (a) 55 to 85% by weight of a high molecular weight butadiene/acrylonitrile copolymer having a number average molecular weight of 20,000 to 75,000, an acrylonitrile content of 10 to 50% by weight, and a carboxyl content of 1 to 15% by weight; (b) 5 to 40% by weight of a low molecular weight butadiene polymer having a number average molecular weight of 750 to 10,000, an acrylonitrile content of 0 to 50% by weight, and a carboxyl content of 0 to 15% by weight, with the proviso that the combination of the high molecular weight butadiene/acrylonitrile copolymer and the low molecular weight butadiene polymer contains at least 2% by weight of carboxyl groups; (c) 2 to 40% by weight of a nongaseous, ethylenically unsaturated compound containing at least one terminal ethylenic group, said compound being capable of forming a high polymer by free-radical initiated, chain-propagating addition polymerization and being compatible with polymers (a) and (b); and (d) 0.001 to 10% by weight of an organic, radiation-sensitive, free-radical generating system, activatable by actinic radiation which initiates polymerization of the unsaturated compound.
Claim 2
Dependent Claim
191 words
A photosensitive, elastomeric composition which comprises, based on the total composition, (a) 55 to 85% by weight of a high molecular weight butadiene/acrylonitrile copolymer having a number average molecular weight of 20,000 to 75,000, an acrylonitrile content of 10 to 50% by weight, and a carboxyl content of 1 to 15% by weight; (b) 5 to 40% by weight of a low molecular weight butadiene polymer having a number average molecular weight of 750 to 10,000, an acrylonitrile content of 0 to 50% by weight, and a carboxyl content of 0 to 15% by weight, with the proviso that the combination of the high molecular weight butadiene/acrylonitrile copolymer and the low molecular weight butadiene polymer contains at least 2% by weight of carboxyl groups; (c) 2 to 40% by weight of a nongaseous, ethylenically unsaturated compound containing at least one terminal ethylenic group, said compound being capable of forming a high polymer by free-radical initiated, chain-propagating addition polymerization and being compatible with polymers (a) and (b); and (d) 0.001 to 10% by weight of an organic, radiation-sensitive, free-radical generating system, activatable by actinic radiation which initiates polymerization of the unsaturated compound.
Claim 3
Dependent Claim
29 words
The photosensitive, elastomeric composition of claim 1 in which high molecular weight copolymer (a) and low molecular weight polymer (b) both have a carboxyl content of 2 to 10%.
Claim 4
Dependent Claim
38 words
The photosensitive, elastomeric composition of claim 1 in which high molecular weight copolymer (a) is present in the amount of 60 to 75%, and low molecular weight polymer (b) is present in the amount of 10 to 35%.
Claim 5
Dependent Claim
30 words
The photosensitive, elastomeric composition of claim 3 in which high molecular weight copolymer (a) has a molecular weight of 25,000 to 50,000 and an acrylonitirle content of 15 to 40%.
Claim 6
Dependent Claim
22 words
The photosensitive, elastomeric composition of claim 4 in which high molecular weight copolymer (a) has a carboxyl content of 2 to 10%.
Claim 7
Dependent Claim
30 words
The photosensitive, elastomeric composition of claim 3 in which low molecular weight polymer (b) has a molecular weight of 1000 to 5000 and an acrylonitrile content of 10 to 30%.
Claim 8
Dependent Claim
22 words
The photosensitive, elastomeric composition of claim 6 in which low molecular weight polymer (b) has a carboxyl content of 2 to 10%.
Claim 9
Dependent Claim
72 words
The photosensitive, elastomeric composition of claim 2 in which high molecular weight copolymer (a) is present in the amount of 60 to 75%, and has a molecular weight of 25,000 to 50,000 and an acrylonitrile content of 15 to 40%, and low molecular weight polymer (b) is present in the amount of 10 to 35%, and has a molecular weight of 1000 to 5000 and an acrylonitrile content of 10 to 30%.
Claim 10
Dependent Claim
52 words
The photosensitive, elastomeric composition of claim 3 in which high molecular weight copolymer (a) has a molecular weight of 25,000 to 50,000 and an acrylonitrile content of 15 to 40%, and low molecular weight polymer (b) has a molecular weight of 1000 to 5000 and an acrylonitrile content of 10 to 30%.
Claim 11
Dependent Claim
28 words
A photosensitive flexographic plate which comprises a substrate having thereon a layer of the photosensitive, elastomeric composition of claim 1 having a thickness of 0.5 to 250 mils.
Claim 12
Dependent Claim
28 words
The flexographic plate of claim 10 in which high molecular weight copolymer (a) and low molecular weight polymer (b) both have a carboxyl content of 2 to 10%.
Claim 13
Dependent Claim
37 words
The flexographic plate of claim 10 in which high molecular weight copolymer (a) is present in the amount of 60 to 75%, and low molecular weight polymer (b) is present in the amount of 10 to 35%.
Claim 14
Dependent Claim
29 words
The flexographic plate of claim 12 in which high molecular weight copolymer (a) has a molecular weight of 25,000 to 50,000 and an acrylonitrile content of 15 to 40%.
Claim 15
Dependent Claim
21 words
The flexographic plate of claim 13 in which high molecular weight copolymer (a) has a carboxyl content of 2 to 10%.
Claim 16
Dependent Claim
29 words
The flexographic plate of claim 12 in which low molecular weight polymer (b) has a molecular weight of 1000 to 5000 and an acrylonitrile content of 10 to 30%.
Claim 17
Dependent Claim
21 words
The flexographic plate of claim 15 in which low molecular weight polymer (b) has a carboxyl content of 2 to 10%.
Claim 18
Dependent Claim
71 words
The flexographic plate of claim 11 in which high molecular weight copolymer (a) is present in the amount of 60 to 75%, and has a molecular weight of 25,000 to 50,000 and an acrylonitrile content of 15 to 40%, and low molecular weight polymer (b) is present in the amount of 10 to 35% and has a molecular weight of 1000 to 5000 and an acrylonitrile content of 10 to 30%.
Claim 19
Dependent Claim
51 words
The flexographic plate of claim 12 in which high molecular weight copolymer (a) has a molecular weight of 25,000 to 50,000 and an acrylonitrile content of 15 to 40%, and low molecular weight polymer (b) has a molecular weight of 1000 to 5000 and an acrylonitrile content of 10 to 30%.
References Cited (Backward Citations)
US3787212A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-12-03 | 1983-06-04 | 1983-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-03 | 1987-06-04 | 1987-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-03 | 1991-06-04 | 1991-12-04 | $7700.00 | Window Closed / Lapsed |