US4304841A
Expired / Lapsed
US
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Photopolymerizable mixture and photopolymerizable copying material produced therewith
Assignee: Hoechst AG
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Filing: 1980-11-05
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Granted: 1981-12-08
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Expires: 2000-11-05
Abstract
Abstract A photopolymerizable mixture is described which contains a polymeric binder, a compound which is polymerizable by a free radical mechanism and has at least two ethylenically unsaturated polymerizable groups, a photoinitiator, and additionally contains a disulfide compound of the formula R.sub.1 --CH.sub.2 --S--S--CH.sub.2 --R.sub.2 in which R 1 and R 2 are identical or different and are alkyl, cycloalkyl, aryl, aralkyl or N-substituted carbamoyl or carbamoylalkyl groups. When applied as a photopolymerizable layer to a layer support, the mixture has a low sensitivity to atmospheric oxygen. Covering of the layer by oxygen-inhibiting cover sheets or cover layers is not required.
Inventors
- 👤 Klaus Horn
- 👤 Kurt Klupfel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:20
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/027; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/114; Y10S430/118; Y10S430/122
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
98 words
A photopolymerizable mixture which comprises a polymeric binder, a compound which is polymerizable by a free radical mechanism and has at least two ethylenically unsaturated polymerizable groups, and an effective amount of a photoinitiator for initiating the photoinitiated free-radical addition polymerization of the polymerizable compound, and which additionally contains an effective amount of a disulfide compound to reduce the sensitivity of the mixture to oxygen, said disulfide compound having the formula R.sub.1 --CH.sub.2 --S--S--CH.sub.2 --R.sub.2 in which R 1 and R 2 are identical or different and are alkyl, cycloalkyl, aryl, aralkyl or N-substituted carbamoyl or carbamoylalkyl groups.
Claim 2
Dependent Claim
98 words
A photopolymerizable mixture which comprises a polymeric binder, a compound which is polymerizable by a free radical mechanism and has at least two ethylenically unsaturated polymerizable groups, and an effective amount of a photoinitiator for initiating the photoinitiated free-radical addition polymerization of the polymerizable compound, and which additionally contains an effective amount of a disulfide compound to reduce the sensitivity of the mixture to oxygen, said disulfide compound having the formula R.sub.1 --CH.sub.2 --S--S--CH.sub.2 --R.sub.2 in which R 1 and R 2 are identical or different and are alkyl, cycloalkyl, aryl, aralkyl or N-substituted carbamoyl or carbamoylalkyl groups.
Claim 3
Dependent Claim
27 words
A photopolymerizable mixture as claimed in claim 1, which contains the disulfide compound in a quantity of 0.1 to 10 percent by weight, relative to non-volatile constituents.
Claim 4
Dependent Claim
21 words
A photopolymerizable mixture as claimed in claim 1 which contains an acridine, phenazine, quinoxaline, quinazoline or benzalquinaldine compound as the photoinitiator.
Claim 5
Dependent Claim
19 words
A photopolymerizable mixture as claimed in claim 1 which contains a binder which is soluble in dilute aqueous-alkaline solutions.
Claim 6
Dependent Claim
32 words
A photopolymerizable mixture as claimed in claim 1 which contains an acrylic or methacrylic acid ester of a polyhydric alcohol, of a molecular weight of less than 1,000, as the photopolymerizable compound.
Claim 7
Dependent Claim
107 words
A photopolymerizable copying material with a layer support and a photopolymerizable layer which contains a polymeric binder, a compound which is polymerizable by a free radical mechanism and has at least two ethylenically unsaturated polymerizable groups, and an adequate quantity of a photoinitiator for initiating the photoinitiated free-radical addition polymerization of the polymerizable compound, and which additionally contains an effective amount of a disulfide compound to reduce the sensitivity of the mixture to oxygen, said disulfide compound having the formula R.sub.1 --CH.sub.2 --S--S--CH.sub.2 --R.sub.2 in which R 1 and R 2 are identical or different and are alkyl, cycloalkyl, aryl, aralkyl or N-substituted carbamoyl or carbamoylalkyl groups.
Claim 8
Dependent Claim
107 words
A photopolymerizable copying material with a layer support and a photopolymerizable layer which contains a polymeric binder, a compound which is polymerizable by a free radical mechanism and has at least two ethylenically unsaturated polymerizable groups, and an adequate quantity of a photoinitiator for initiating the photoinitiated free-radical addition polymerization of the polymerizable compound, and which additionally contains an effective amount of a disulfide compound to reduce the sensitivity of the mixture to oxygen, said disulfide compound having the formula R.sub.1 --CH.sub.2 --S--S--CH.sub.2 --R.sub.2 in which R 1 and R 2 are identical or different and are alkyl, cycloalkyl, aryl, aralkyl or N-substituted carbamoyl or carbamoylalkyl groups.
References Cited (Backward Citations)
US4045231A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-07 | 1985-06-08 | 1985-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-07 | 1989-06-08 | 1989-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-07 | 1993-06-08 | 1993-12-08 | $7700.00 | Window Closed / Lapsed |