US4447510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing relief copies in light hardenable materials with ultrasonic treatment
Assignee: Hoechst AG
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Filing: 1982-05-07
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Granted: 1984-05-08
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Expires: 2002-05-07
Abstract
Abstract A process for producing relief copies wherein the light-hardenable layer of a light-hardenable copying material, which contains a photopolymerizable mixture, a photodimerizable polymeric compound or a diazonium salt polycondensation product, is exposed to a light image, the exposed layer is subjected to a brief ultrasonic treatment, and the unexposed areas of the layer are thereafter washed away by means of a developer. As a result of the ultrasonic treatment, shorter exposure times may be used and better in-depth hardening of the layer may be achieved.
Inventors
- 👤 Werner Frass
- 👤 Klaus Horn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:54
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/26; G03F7/38
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
69 words
A process for producing relief copies comprising: exposing the light-hardenable layer of a light-hardenable copying material to a light image; said layer comprising at least one material selected from the group consisting of photopolymerizable mixtures, photodimerizable polymeric compounds and diazonium salt condensation products; subjecting the exposed layer to immersion in an ultrasonic bath; and thereafter developing the layer by washing away unexposed areas of the layer with a developer.
Claim 2
Dependent Claim
69 words
A process for producing relief copies comprising: exposing the light-hardenable layer of a light-hardenable copying material to a light image; said layer comprising at least one material selected from the group consisting of photopolymerizable mixtures, photodimerizable polymeric compounds and diazonium salt condensation products; subjecting the exposed layer to immersion in an ultrasonic bath; and thereafter developing the layer by washing away unexposed areas of the layer with a developer.
Claim 3
Dependent Claim
22 words
A process according to claim 1, wherein said ultrasonic bath is at a temperature from about 4° C. to about 50° C.
Claim 4
Dependent Claim
22 words
A process according to claim 2, wherein said ultrasonic bath is at a temperature from about 15° C. to about 30° C.
Claim 5
Dependent Claim
27 words
A process according to claim 1, wherein said exposed layer is immersed in said ultrasonic bath for a period from about 5 seconds to about 40 minutes.
Claim 6
Dependent Claim
27 words
A process according to claim 4, wherein said exposed layer is immersed in said ultrasonic bath for a period from about 30 seconds to about 15 minutes.
Claim 7
Dependent Claim
24 words
A process according to claim 1, wherein said immersion is carried out within a period of up to one hour after said exposure step.
Claim 8
Dependent Claim
45 words
A process according to claim 1, wherein said light-hardenable copying material comprises a photopolymerizable layer, said layer comprising a polymerizable compound having at least two terminal ethylenically unsaturated double bonds, a polymeric binder, and a photoinitiator; said photoinitiator generating free radicals upon exposure to light.
Claim 9
Dependent Claim
18 words
A process according to claim 7, wherein said photopolymerizable layer further comprises a stabilizer for preventing dark polymerization.
Claim 10
Dependent Claim
40 words
A process according to claim 7, wherein said photopolymerizable layer comprises, by weight, from about 10 to about 80 percent polymerizable monomer, from about 20 to about 90 percent polymeric binder, and from about 0.01 to about 10 percent photoinitiator.
Claim 11
Dependent Claim
40 words
A process according to claim 9, wherein said photopolymerizable layer comprises, by weight, from about 20 to about 60 percent polymerizable monomer, from about 40 to about 80 percent polymeric binder, and from about 0.2 to about 5 percent photoinitiator.
Claim 12
Dependent Claim
20 words
A process according to claim 7, wherein said polymerizable monomer comprises an acrylate or methacrylate ester of a polyhydroxy compound.
Claim 13
Dependent Claim
15 words
A process according to claim 7, wherein said binder is soluble in aqueous alkaline solutions.
Claim 14
Dependent Claim
24 words
A process according to claim 7, wherein said photopolymerizable layer is provided with a cover layer for protecting the photopolymerizable layer against atmospheric oxygen.
Claim 15
Dependent Claim
15 words
A process according to claim 1, wherein said light-hardenable layer comprises a photodimerizable polymeric compound.
Claim 16
Dependent Claim
19 words
A process according to claim 14, wherein said photodimerizable compound comprises a cinnamic acid ester of a polyhydroxy compound.
Claim 17
Dependent Claim
16 words
A process according to claim 1, wherein said light-hardenable layer comprises a diazonium salt condensation product.
Claim 18
Dependent Claim
22 words
A process according to claim 16, wherein said diazonium salt condensation product is formed by condensing an aromatic diazonium salt with formaldehyde.
Claim 19
Dependent Claim
34 words
A process according to claim 16, wherein said light-hardenable layer comprises, by weight, from about 10 to 100 percent diazonium salt condensation product and from about 0 to about 90 percent water-insoluble resinous binder.
Claim 20
Dependent Claim
18 words
A process according to claim 1, wherein said copying material comprises a light-hardenable layer disposed on a support.
Claim 21
Dependent Claim
14 words
A process according to claim 19, wherein said support comprises an anodized aluminum plate.
Claim 22
Dependent Claim
19 words
A process according to claim 1, wherein said copying material is exposed by contact exposure through a transparent original.
Claim 23
Dependent Claim
14 words
A process according to claim 1, wherein said developer is an aqueous alkaline solution.
Claim 24
Dependent Claim
15 words
A process according to claim 1, wherein said copying material is exposed with laser light.
References Cited (Backward Citations)
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GB1397567A
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US3849135A
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GB1420958A
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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) | 1987-05-08 | 1987-11-07 | 1988-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-08 | 1991-11-07 | 1992-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-08 | 1995-11-07 | 1996-05-08 | $7700.00 | Window Closed / Lapsed |