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Lithographic printing plate precursor

a technology of lithographic printing plate and precursor, which is applied in the direction of lithography, photomechanical equipment, instruments, etc., can solve the problems of inability to detect and discriminate from the plate including colorants, and achieve excellent visual contrast

Pending Publication Date: 2022-03-03
AGFA OFFSET BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution enables excellent visual contrast and immediate image quality inspection after UV exposure, ensuring proper exposure and quality assessment before development, even in direct on-press processing, with a CIE 1976 colour distance ΔE of at least 5 between image and non-image areas.

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.
However, for photopolymer lithographic printing plates which are processed on-press and thus development of the plate is not carried out before mounting the plate on the press, a previous inspection and discrimination of the plate including colorants is not possible.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

1. Preparation of the Printing Plate Precursors PPP-00 to PPP-06

[0127]Preparation of the Aluminum Support S-01

[0128]A 0.3 mm thick aluminum 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 aluminum 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. fo...

example 2

1. Preparation of the Printing Plate Precursors PPP-07 to PPP-12

[0138]Preparation of the Aluminum Support S-01

[0139]See Example 1 above

[0140]Photopolymerisable Layer

The printing plate precursor PPP-07 to PPP-12 were prepared by coating onto the above described support S-01 the components as defined in Table 5 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 5Printing plate precursors PPP-07 to PPP-12Printing plateprecursorPPP-07PPP-08PPP-09PPP-10PPP-11PPP-12Binder (1)120.0120.0120.0120.0120.0120.0Tegoglide 410 (2)1.51.51.51.51.51.5Mono Z1620 (3)240240240240240240HABI 1-2 (4)333333MBT (5)212121212121Fluomix (6)606060—6060Omnicat 440 (7)—50—50——NaPF6−——18.5—18.5—Thioxantone (8)——6060—BF4−————18.5(1) To (7): see Table 1 above;(8) Speedcure ITX commer...

example 3

1. Preparation of the Printing Plate Precursors PPP-14 to PPP-16

[0147]Preparation of the Aluminum Support S-01

[0148]See Example 1 above

[0149]Photopolymerisable Layer

[0150]The printing plate precursor PPP-14 to PPP-16 were prepared by coating onto the above described support S-01 the components as defined in Table 7 dissolved in a mixture of 22% by volume of MeOH and 77% by volume of Dowanol PM (1-methoxy-2-propanol, commercially available from DOW CHEMICAL Company) and 1% by volume monoethylene glycol. The coating solution was applied at a wet coating thickness of 26 μm and then dried at 120° C. for 1 minute in a circulation oven.

TABLE 7Printing plate precursors PPP-14 to PPP-16Printing plate precursor PPP-14PPP-15PPP-16Binder (1)436.0436.0436.0Edaplan LA411 (2)3.33.33.3Phosphoric acid17.317.317.3Diazonium polymer (3)436436436Fluomix (4)—5050Omnicat 440 (5)—175175(1) PAL 166, Polyvinylbutyral, vinyl alcohol, vinylbutyral copolymer, commercially available form Agfa NV;(2) Edaplan LA4...

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Abstract

A lithographic printing plate precursor is disclosed including a support and a coating comprising a sensitizer and an onium salt wherein the onium salt and the sensitizer are capable of inducing a print-out image upon UV light exposure.

Description

BACKGROUND ART[0001]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-adhesive (ink-repelling) areas and during driographic printing, only ink is supplied to the master.[0002]Lithographic printing masters are generally obtained by the image-wise exposure and ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G03F7/004B41C1/10G03F7/016G03F7/029
CPCG03F7/0045B41C1/1016B41C2210/04G03F7/029G03F7/0166G03F7/016G03F7/027G03F7/038G03F7/105G03F7/3035B41C1/1033
Inventor HENDRIKX, PETERBILLIET, THOMASLOCCUFIER, JOHANHIMSCHOOT, KATLEEN
Owner AGFA OFFSET BV
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