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A lithographic printing plate precursor

a technology precursor, which is applied in the direction of lithography, photomechanical equipment, instruments, etc., can solve the problems of poor storage stability, poor sensitivity of lithographic printing plate precursors, and increased tendency to toning and/or coating defects in the prior art, etc., to achieve excellent sensitivity and good storage stability

Inactive Publication Date: 2021-01-14
AGFA NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The combination of trihaloalkyl sulfone initiator and borate compound enhances the shelf life and sensitivity of the printing plate, reducing the formation of defects and toning, even after extended storage, and allows for stable performance during on-press processing with improved cohesive strength.

Problems solved by technology

Although some plate precursors are capable of producing a lithographic image immediately after exposure, the most popular lithographic plate precursors require wet processing since the exposure produces a difference in solubility or difference in rate of dissolution in a developer between the exposed and the non-exposed areas of the coating.
Printing plate precursors of the prior art often suffer from an increased tendency to toning and / or formation of defects in the coating after storage.
Especially printing plate precursors which are processed with a gum solution and / or which are processed on-press with fountain solution and ink, as described above, may suffer from this shelf life problem.
Indeed, as such image-wise exposed plate precursors are processed under non-aggressive conditions—i.e. without application of strongly alkaline (pH 12) solutions, the removal of the coating in the non-exposed areas can be incomplete (i.e. insufficient clean-out) and this may result in an increased tendency of accepting ink in the hydrophilic non-image areas on the press (i.e. toning).

Method used

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  • A lithographic printing plate precursor
  • A lithographic printing plate precursor
  • A lithographic printing plate precursor

Examples

Experimental program
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Effect test

example 1

[0119]1. Preparation of the Printing Plates PP-01 to PP-14

[0120]Preparation of the Aluminium Support S-01

[0121]A 0.3 mm thick aluminium foil was degreased by spraying with an aqueous solution containing 26 g / l NaOH at 65° C. for 2 seconds and rinsed with demineralised water for 1.5 seconds. The foil was then electrochemically grained during 10 seconds using an alternating current in an aqueous solution containing 15 g / l HCl, 15 g / l SO42− ions and 5 g / l Al3+ ions at a temperature of 37° C. and a current density of about 100 A / dm2. Afterwards, the aluminium foil was then desmutted by etching with an aqueous solution containing 5.5 g / l of NaOH at 36° C. for 2 seconds and rinsed with demineralised water for 2 seconds. The foil was subsequently subjected to anodic oxidation during 15 seconds in an aqueous solution containing 145 g / l of sulfuric acid at a temperature of 50° C. and a current density of 17 A / dm2, then washed with demineralised water for 11 seconds and dried at 120° C. for 5...

example 2

[0156]1. Preparation of the Printing Plates PP-15 to PP-20

[0157]Preparation of the Aluminium Support S-01

[0158]See Example 1.

[0159]Preparation of the Printing Plate Precursors PP-15 to PP-20

[0160]Photopolymerisable Layer

[0161]Printing plate precursors PPP-15 to PPP-21 were produced by coating onto the above described support S-01 the components as defined in Table 7 dissolved in a mixture of 35% by volume of MEK and 65% by volume of Dowanol PM (1-methoxy-2-propanol, commercially available from DOW CHEMICAL Company). The coating solution was applied at a wet coating thickness of 30 μm and then dried at 120° C. for 1 minute in a circulation oven.

TABLE 7Printing plate precursors PPP-15 to PPP-20Ingredients*PPP-15PPP-16PPP-17PPP-18PPP-19PPP-20g / m2invinvinvinvinvcompS2025 (1)0.022=====S-LEC 0.150=====BX35-Z (2)FST 510 (3)0.281=====CN-UVE 0.281=====151M (4)Tegoglide 0.0015=====410 (5)p-OH-0.0600.0450.0450.0300.0300.060TBMPS (6)Sipomer 0.130=====PAM 100 (7)Albritect 0.024=====CP 30 (8)Pigm...

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Abstract

A method for making a lithographic printing plate is disclosed including the steps of (i) image-wise exposing a printing plate precursor to heat and / or IR radiation; said precursor including a support and a coating comprising a polymerisable compound, an infrared absorbing compound, a borate compound and a photoinitiator including a trihaloalkyl group; (ii) developing the exposed precursor by treating the coating of the precursor with a gum solution thereby removing the coating from the support at the non-image areas; and / or by mounting the precursor on a plate cylinder of a lithographic printing press and rotating the plate cylinder while feeding dampening liquid and / or ink to the precursor.

Description

TECHNICAL FIELD[0001]The invention relates to a novel lithographic printing plate precursor.BACKGROUND ART[0002]Lithographic printing typically involves the use of a so-called printing master such as a printing plate which is mounted on a cylinder of a rotary printing press. The master carries a lithographic image on its surface and a print is obtained by applying ink to said image and then transferring the ink from the master onto a receiver material, which is typically paper. In conventional lithographic printing, ink as well as an aqueous fountain solution (also called dampening liquid) are supplied to the lithographic image which consists of oleophilic (or hydrophobic, i.e. ink-accepting, water-repelling) areas as well as hydrophilic (or oleophobic, i.e. water-accepting, ink-repelling) areas. In so-called driographic printing, the lithographic image consists of ink-accepting and ink-abhesive (ink-repelling) areas and during driographic printing, only ink is supplied to the maste...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B41C1/10G03F7/029G03F7/004
CPCB41C1/1008G03F7/0295G03F7/0045B41C2210/22B41C2210/08B41C2210/20B41C2210/04B41C1/1016B41C2201/02B41C2210/02B41C2210/12B41C2210/24G03F7/028
Inventor BILLIET, THOMAS
Owner AGFA NV