US4937169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-sensitive printing plate for waterless planographic printing with inner and outer layer of silicone rubber wherein outer layer has higher degree of crosslinking than inner layer
Assignee: Hoechst AG
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Filing: 1988-09-15
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Granted: 1990-06-26
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Expires: 2008-09-15
Abstract
Abstract A light-sensitive printing plate for waterless planographic printing is disclosed comprising a support, a superimposed light-sensitive layer, an outer, ink-repellent silicone rubber layer, and an inner, ink-repellent silicone layer between the light-sensitive layer and the outer silicone rubber layer, the outer silicone rubber layer having a higher degree of crosslinking than the inner layer. The printing plate is less sensitive to scratching and, at the same time, shows good developability and image resolution.
Inventors
- 👤 Hans-Joachim Schlosser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:13
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/075; G03F7/0752
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
49 words
A light-sensitive printing plate for waterless planographic printing, comprising: a support; a superimposed light-sensitive layer selected from the group consisting of a light sensitive layer which becomes soluble in developer upon exposure to light and a light-hardenable layer which becomes insoluble in a developer upon exposure to light; and
Claim 2
Dependent Claim
49 words
A light-sensitive printing plate for waterless planographic printing, comprising: a support; a superimposed light-sensitive layer selected from the group consisting of a light sensitive layer which becomes soluble in developer upon exposure to light and a light-hardenable layer which becomes insoluble in a developer upon exposure to light; and
Claim 3
Dependent Claim
56 words
A light-sensitive printing plate as claimed in claim 1, wherein the condensation-crosslinked multicomponent silicone elastomer comprises the reaction product of a combination of (a) a diorganopolysiloxane having terminal Si-OH groups, (b) an organopolysiloxane containing hydrogen atoms bonded to silicon and having no amino groups, (c) an amino-substituted organo-silicon compound and (d) a catalytically acting organo-tin compound.
Claim 4
Dependent Claim
71 words
A light-sensitive printing plate as claimed in claim 1, wherein the addition-crosslinked multicomponent silicone elastomer comprises the reaction product of a combination of (a) a diorganopolysiloxane having terminal Si-vinyl groups, (b) an organopolysiloxane having at least three hydrogen atoms bonded to silicon, (c) a platinum complex of a vinyl siloxane and (c) an agent which retards the addition of hydrogen atoms bonded to silicon to aliphatic multiple bonds at room temperature.
Claim 5
Dependent Claim
26 words
A light-sensitive printing plate as claimed in claim 1, wherein the outer silicone rubber layer has a layer thickness ranging from about 0.2 to 10 μm.
Claim 6
Dependent Claim
26 words
A light-sensitive printing plate as claimed in claim 1, wherein the inner silicone rubber layer has a layer thickness ranging from about 0.1 to 10 μm.
Claim 7
Dependent Claim
19 words
A light-sensitive printing plate as claimed in claim 1, wherein the light-sensitive layer comprises a diazonium salt polycondensation product.
Claim 8
Dependent Claim
33 words
A light-sensitive printing plate as claimed in claim 1, wherein the outer silicone rubber layer comprises a condensation-crosslinked multi-component silicone elastomer, and the inner silicone rubber layer comprises an addition-crosslinked multi-component silicone elastomer.
Claim 9
Dependent Claim
17 words
A light-sensitive printing plate as claimed in claim 7, wherein the light-sensitive layer comprises a light-hardenable layer.
Claim 10
Dependent Claim
19 words
A light-sensitive printing plate as claimed in claim 7, wherein the light-sensitive layer comprises a diazonium salt polycondensation product.
Claim 11
Dependent Claim
33 words
A light-sensitive printing plate as claimed in claim 1, wherein the outer silicone rubber layer comprises a condensation-crosslinked multi-component silicone elastomer, and the inner silicone rubber layer comprises a crosslinked single-component silicone elastomer.
Claim 12
Dependent Claim
19 words
A light-sensitive printing plate as claimed in claim 10, wherein the light-sensitive layer comprises a diazonium salt polycondensation product.
References Cited (Backward Citations)
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Cited
US4184006A
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US4358522A
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US4690886A
Cited
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US4826752A
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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) | 1993-06-25 | 1993-12-25 | 1994-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-25 | 1997-12-25 | 1998-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-25 | 2001-12-25 | 2002-06-26 | $7700.00 | Window Closed / Lapsed |