Claims
- 1. A heat mode imaging element for making a lithographic printing plate having on a lithographic base with a hydrophilic surface a first layer including a polymer, soluble in an aqueous alkaline solution and a top layer on the same side of the lithographic base as the first layer which top layer is IR-sensitive and unpenetrable for an alkaline developer; characterized in that said top layer contains a compound that increases the dynamic friction coefficient of the top layer to between 0.40 and 0.80.
- 2. A heat mode imaging element for making a lithographic printing plate according to claim 1 wherein said compound is a copolymer of polytetrafluoroethylene-polyethylene.
- 3. A heat mode imaging element for making a lithographic printing plate according to claim 1 wherein said compound is a silica.
- 4. A heat mode imaging element for making a lithographic printing plate according to claim 1 wherein said compound is a hydrophobic ceramic.
- 5. A heat mode imaging element for making a lithographic printing plate according to claim 4 wherein said top layer further contains silica particles.
- 6. A heat mode imaging element for making a lithographic printing plate according to claim 4 wherein said top layer further contains an orthosilicate.
- 7. A heat mode imaging element for making a lithographic printing plate according to claim 1 wherein said compound is barium sulphate.
- 8. A heat mode imaging element for making a lithographic printing plate according to claim 1 wherein said compound is present in said top layer in an amount between 10 and 800 mg/m2.
- 9. A method for making a lithographic printing plate comprising the steps ofa) exposing imagewise to IR-radiation a heat mode imaging element according to claim 1; and b) developing said imagewise exposed heat mode imaging element with an aqueous alkaline developer whereby the exposed areas of the first and the top layer, which may be the same, are dissolved and the unexposed areas of the first layer remain undissolved.
Priority Claims (1)
Number |
Date |
Country |
Kind |
98201214 |
Apr 1998 |
EP |
|
Parent Case Info
This application claims benefit of Prov. No. 60/089,286 filed Jun. 15, 1998.
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Date |
Kind |
3619157 |
Brinckman et al. |
Nov 1971 |
A |
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A |
5448066 |
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A |
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A |
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Number |
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0 823 327 |
Feb 1998 |
EP |
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Provisional Applications (1)
|
Number |
Date |
Country |
|
60/089286 |
Jun 1998 |
US |